JPH11271472A - Electronic clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally control a drive pulse by discriminating a current wave form when a drive force is extremely large from that of a drive force when the drive force is normal. SOLUTION: An electronic clock is provided with a generation means, a recharging means accompanying a voltage fluctuation, a means 21 for judging the movement of a rotor 70 from an induced voltage, a means 22 for creating a strobe pulse for detecting the above induced voltage, and a drive pulse control means that is controlled by the judgment means 21. In the clock, a resistor for detecting the above induced voltage is set to 30 times the resistance of a coil 60 or smaller so that the detection level of the above induced voltage can be slow when the drive voltage is high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for selecting a drive pulse of an electronic timepiece which prepares a plurality of drive pulses and always selects and outputs an optimum drive pulse.

[0002]

2. Description of the Related Art Conventionally, an electronic timepiece employs a method in which a plurality of drive pulses are prepared in order to reduce current consumption, and a drive pulse which can always be driven with a minimum energy is selected from the drive pulses to drive a motor. I have. A brief description of the selection method is as follows. First, a drive pulse is output, and then it is determined whether the motor has rotated. If the rotation has not been performed, a correction drive pulse is output immediately. When the next driving pulse is output, the driving pulse is switched to a driving pulse having a driving force one rank larger than that of the previous driving pulse and output. When the motor rotates, the same drive pulse as the previous one is output when the next drive pulse is output. When the same drive pulse is output a certain number of times, the drive pulse is selected in such a manner that the drive pulse is switched to a drive pulse having a drive power smaller by one rank.

However, in the above-mentioned method, when a pulse having a driving force larger than necessary is selected at first, a driving pulse with an excessive current consumption is continuously output for a long time until an optimum driving pulse is selected. There was a problem. A motor load compensation circuit for an analog electronic timepiece that solves this problem has been proposed in Japanese Patent Publication No. 5-57840. The driving pulse selection method by the motor load compensation circuit of the analog electronic timepiece disclosed in Japanese Patent Publication No. 5-57840 will be described with reference to the drawings.

FIG. 8 is a waveform chart showing the operation of the conventional example.
8A, 8B, 8C and 8D, Im is a current waveform, Pm is a drive pulse, Ps1 and Ps2 are strobe pulses, Pv1 and Pv2 are induced voltage pulses, and P1 is an induced voltage pulse Pv1. Set induced voltage pulse Pv
2 is a signal that is reset. The sawtooth shape of the drive pulse Pm due to the chopper at the peak Ip of the current waveform due to the drive pulse Pm of the current waveform Im is not necessary for explanation and is omitted. The strobe pulse Ps1 is output on the same side as the drive pulse Pm,
s2 is output to the opposite side. Induced voltage pulses Pv1 and Pv
v2 is ANDed with the strobe pulses Ps1 and Ps2, respectively. Then, the induced voltage generated in the coil is detected. Therefore, if the current waveform Im is below the detection level N in FIG. 8, the induced voltage pulse Pv1 is output, and if the current waveform Im is above the detected level N, the induced voltage pulse Pv2 is output.

FIG. 8A shows the fourth example of Japanese Patent Publication No. 5-57840.
It is a figure corresponding to figure (2). In FIG. 8A, the peak Iy of the current waveform is the peak Ip of the current waveform due to the drive pulse Pm.
Appearing much later, this is the current waveform when the driving force is weak. At this time, first, at timing a1, immediately after the peak Ip of the current waveform, the current waveform Im rises above the detection level N, and the induced voltage pulse Pv1 is not output.
However, from the timing a2 to the timing a7, the current waveform Im becomes lower than the detection level N and the induced voltage pulse Pv
1 is output. However, at the next timing a8, the induced voltage pulse Pv1 is not output because the current waveform Im reaches the peak Iy and is higher than the detection level N. On the other hand, the induced voltage pulse Pv2 is output at the timing b1 when the current waveform Im becomes the peak Iy of the current waveform and becomes higher than the detection level N.
Because. Therefore, the induced voltage pulse Pv2 is output at the timings b1, b2, and b3 during the peak Iy of the current waveform. However, at the timing b4, the peak Iy of the current waveform ends and the valley It of the current waveform ends, and the induced voltage pulse Pv2 is not output. Also, at timing c1, the valley It of the current waveform
Therefore, the induced voltage pulse Pv1 is output. Signal P
1 is set at timing a1, reset at timing b1, and set again at timing c1. Therefore P
The number of times 1 is set is 2 times, T1 is 1 and T2 is 7. The judgment at this time is judgment number 3, and the next driving pulse is a driving pulse one rank larger.

FIG. 8 (b) is a view corresponding to FIG. 4 (3) of Japanese Patent Publication No. 5-57840. In FIG. 8 (b), the peak Iy of the current waveform Im is located on the left side of FIG. 8 (a). I'm approaching This is a current waveform in which the driving force is slightly stronger than that in FIG. At timing a1, the current waveform Im is higher than the detection level N, and the induced voltage pulse Pv1 is not output.
However, from the timing a2 to the timing a4, the current waveform Im becomes lower than the detection level N and the induced voltage pulse Pv
1 is output. However, at the next timing a5, the current waveform reaches the peak Iy, so that the current level becomes higher than the detection level N, and the induced voltage pulse Pv1 is not output. On the other hand, the induced voltage pulse Pv2 is output from the timing b1 when the current waveform Im becomes higher than the detection level N. Then, the induced voltage pulse Pv2 is output between the peaks Iy of the current waveform at timings b1 to b5. However, at the timing b6, the peak Iy of the current waveform ends and the valley It of the current waveform ends, so that the induced voltage pulse Pv2 is not output. Also, the timing c1
In this case, because of the valley It of the current waveform, the induced voltage pulse Pv1
Is output. The signal P1 is set at timing a1, reset at timing b1, and set again at timing c1. Therefore, P1 is set twice, T1 is 1,
T2 becomes 3, and the determination at this time is determination number 2, which is regarded as the optimum state, and the same drive pulse is output as the next drive pulse.

FIG. 8 (c) shows a fourth example of Japanese Patent Publication No. 5-57840.
FIG. 3 is a diagram corresponding to FIG. In FIG. 8C, the peak Iy of the current waveform is further shifted to the left. The current waveform is fused with the peak Ip of the current waveform due to the driving pulse Pm, and is a current waveform when the driving force is strong. Therefore, at the start of detection, the current waveform Im becomes higher than the detection level N, and the timings b1 to b
At 3, the induced voltage pulse Pv2 is output. However, at the next timing b4, the peak Iy of the current waveform Im ends and the induced voltage pulse Pv2 is not output. On the other hand, the induced voltage pulse Pv1 is output from the timing a1 at which the valley It of the current waveform starts and the current waveform Im becomes lower than the detection level N. Then, until the timing a5, the induced voltage pulse P
v1 is output. However, at timing a6, the peak of the current waveform becomes Iy2, and the induced voltage pulse Pv1 is not output. Further, the timing d1 is determined by the peak Iy2 of the current waveform.
At d2 and d3, the induced voltage pulse Pv2 is output, and at the timing d4, the current waveform becomes the valley It2, so that the induced voltage pulse Pv2 is not output. Therefore, the signal P1 is set at the timing a1 and reset at the timing b1, but is not set again. Therefore, P1 is set once, T1 is 3, and T2 is 3. The determination at this time is determination number 6, and the next drive pulse is a drive pulse that is smaller by two ranks or more.

[0008]

However, in recent years, an electronic timepiece using a secondary battery, such as a solar clock, using a power generating means and a secondary battery with voltage fluctuation has been commercialized. In the electronic timepiece using the secondary battery, in order to cope with voltage fluctuation, a plurality of driving pulses having different driving forces are prepared as compared with an electronic timepiece using a normal battery. In the case of an electronic timepiece using a secondary battery, the current waveform when the driving force is larger than that shown in FIG. is there.
FIG. 8 (d) is a waveform diagram showing such a case. Fig. 8 (d)
In this case, the peak Iy of the current waveform further shifts to the left, and is completely merged with the peak Ip of the current waveform due to the drive pulse Pm, so that there is no distinction. By applying the detection at this time to the above example, the following is obtained.
At the detection start timing a1, the current waveform Im is higher than the detection level N, and the induced voltage pulse Pv1 is not output. However, at timings a2 to a4, the valley It of the current waveform
Since the current waveform Im is lower than the detection level N, the induced voltage pulse Pv1 is output. However, at the next timing a5, the current waveform Im is applied to the peak Iy2 of the current waveform, is higher than the detection level N, and the induced voltage pulse Pv1 is not output. On the other hand, the induced voltage pulse Pv2 is output from the timing b1 at which the peak Im of the current waveform rises above the detection level N due to the peak Iy2 of the current waveform. Therefore, the induced voltage pulse Pv2 is output at the timings b1 to b5 during the peak Iy2 of the current waveform. Also, the peak I of the current waveform
When y2 ends and reaches the trough It2 of the current waveform, timing c
At 1, the induced voltage pulse Pv1 is output. The signal P1 is set at timing a1, reset at timing b1, and set again at timing c1. Therefore, P1 is set twice, T1 is 1, and T2 is 3. This is Figure 8
The determination result is exactly the same as in (b), and the same drive pulse is output as the next drive pulse. However, this driving pulse has a very large driving force and a very large current consumption. That is, although the drive pulse is not appropriate, it cannot be determined, and the drive pulse is erroneously determined to be the optimum drive pulse, and a drive pulse consuming a large amount of current continues to be output, so that the battery is consumed immediately.
An object of the present invention is to solve the above-described problem and to propose an electronic timepiece that does not make a false determination even with a very strong driving pulse.

[0009]

In order to achieve the above object, an electronic timepiece according to the present invention comprises: a power generating means; a power storage means having a voltage fluctuation; a step motor comprising a coil, a stator and a rotor; Detecting means for detecting an induced voltage generated in the coil during the movement of the rotor, determining means for determining the movement of the rotor based on a detection result of the detecting means, and a first means for detecting the induced voltage Strobe pulse generation means for generating a strobe pulse group and a second strobe pulse group, a detection resistor for determining a detection level of the induced voltage, and a drive for driving the step motor based on a result of the determination by the determination means In an electronic timepiece having driving pulse control means for controlling a pulse, the detection resistor is provided with a driving voltage for driving the stepping motor. 3 or 2 times the resistance of the coil to the detection level dull of the induced voltage when a high
It is characterized by being set to 0 times or less.

The determination means alternately switches the output of the first strobe pulse group and the output of the second strobe pulse group until a determination result is obtained.

The drive pulse control means selects a drive pulse which can always be driven with the minimum energy from the prepared drive pulses according to the determination result of the determination means.

[0012] The drive pulse control means selects a drive pulse several stages larger than a drive pulse which can always be driven with the minimum energy from among drive pulses prepared for the drive pulse according to the determination result of the determination means. It is characterized by.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a circuit configuration diagram showing a circuit configuration of the electronic timepiece according to the first embodiment of the present invention. Reference numeral 1 denotes a solar cell as a power generation means, and reference numeral 2 denotes a secondary battery as a power storage means. Reference numeral 100 denotes a clock circuit, which includes an oscillation frequency dividing circuit 3, a driving pulse generating circuit 10, a motor driver circuit 50, and a load detection control circuit 20. The clock circuit 100 operates by receiving power supply from the secondary battery 2. The drive pulse generation circuit 10 generates a plurality of drive pulses Pm having different chopper ratios based on a signal from the oscillation frequency dividing circuit 3, and a plurality of drive pulses Pm generated by the drive pulse generation circuit 11. , A correction drive pulse generation circuit 12 that generates a correction drive pulse Pf output when it is determined that the motor could not be rotated, and a determination that the motor could not be rotated. An AND gate 15 for passing the correction drive pulse Pf in the case where the driving is performed, and an OR gate 14 for outputting the drive pulse Pm or the correction drive pulse Pf to the motor driver circuit 50.

The motor driver circuit 50 includes a flip-flop 51 for alternately switching whether the drive pulse Pm is output from the output terminal OUT1 or OUT2,
AND gates 52a-52f, OR gates 53a, 5
3b, pre-drivers 54a to 54d, driver transistors 55a to 55d, detection inverters 58a and 58b for detecting an induced voltage, detection resistors 57a to 57f and a detection resistor 5 for setting a detection level.
It comprises transistors 59a-59f for selecting resistors 7a-57f. The driver transistors 55a and 55c are P-channel transistors, and the driver transistors 55b and 55d are N-channel transistors. The drains of the driver transistors 55a and 55b and the driver transistors 55c and 55d are connected to form output terminals OUT1 and OUT2, respectively.

A coil 60 is connected to output terminals OUT1 and OUT2 of the motor driver circuit 50. The coil 60 has a value of about 2 kΩ as in a normal electronic timepiece. The detection resistors 57a and 57d are 10 kΩ, the detection resistors 57b and 57e are 25 kΩ, and the detection resistors 57c and 57f are 50 kΩ. One of the three types of detection resistors can be selected. In this embodiment, the resistance selecting transistors 59b and 59e are controlled by the strobe pulse generation circuit 22, and the other resistance selecting transistors 59a, 59c, 59d and 59f are turned off.
25 kΩ of the detection resistors 57b and 57e is selected by setting the FF. The magnetic force generated in the coil 60 is guided to the rotor 70 by a stator (not shown), and the rotor 70 rotates.

The load detection circuit 20 has a strobe pulse Ps
1. Strobe pulse generation circuit 22 for generating Ps2
And AND gates 23 and 24 and AND gates 23 and 2
4 includes a judgment circuit 21 for judging the drive state of the motor based on the induced voltage pulses Pv1 and Pv2 output from the control circuit 4. The determination method of the determination circuit will be described later.

Next, the circuit operation will be described. FIG. 6 shows a driving pulse Pm generated by the driving pulse generating circuit 11,
FIG. 3 is a waveform diagram of a correction drive pulse Pf created by a correction drive pulse creation circuit 12 and strobe pulses Ps1 and Ps2 created by a strobe pulse creation circuit. The drive pulse creation circuit 11 creates a drive pulse Pm having a width of 5 ms shown in FIG. The driving pulse Pm is a chopper-shaped pulse, and a plurality of driving pulses Pm having different driving forces are created by changing the chopper ratio. The drive pulse selection circuit 13 selects one of the plurality of drive pulses Pm based on the determination result of the determination circuit 21 and outputs it.

The correction driving pulse generation circuit 12 outputs the correction driving pulse P shown in FIG.
Create and output f. The correction drive pulse Pf has a total pulse length of 12 ms and a full pulse portion Pf1 of 6 ms in the first half.
And a chopper pulse section Pf2 in the latter half. An output method of the correction drive pulse Pf will be described. The judgment circuit 21 outputs an "L" signal to the AND gate 15 when the motor rotates, and outputs an "H" signal when the motor does not rotate. Therefore, the correction drive pulse Pf is output from the AND gate 15 only when the rotation has not been performed. Then, the driving pulse Pm or the correction driving pulse P
f is the AND gate 52 of the motor driver circuit 50
a and 52b.

The strobe pulse generating circuit 22 is shown in FIG.
1, strobe pulses Ps1, Ps2 as shown in Ps2
Create 2. Note that the strobe pulse Ps1 is illustrated upward and the strobe pulse Ps2 is illustrated downward.
As for the strobe pulse Ps2, the first strobe pulse is output 1 ms after the end of the output of the drive pulse Pm, and 0.5
It is output for 7.5 ms every ms. The first strobe pulse is output 1.25 ms after the output of the drive pulse Pm ends, and the strobe pulse Ps1 is output for 7.75 ms every 0.5 ms. Therefore, the strobe pulse P
The phase of s1 and the strobe pulse Ps2 are shifted by 0.25 ms. The strobe pulse Ps1 is output to AND gates 52c and 52d of the motor driver circuit 50, and the strobe pulse Ps2 is output to AND gates 52e and 52f. The strobe pulse generation circuit 22 sets the signal Pkr to “L” during the output period of the strobe pulse Ps1 and the strobe pulse Ps2, and sets the detection resistors 59b and 59e to O.
Set to N state.

The driving pulse generating circuit 11 generates a driving pulse Pm
And outputs a signal Pr for each output of the driving pulse Pm, and alternately switches the outputs Q and Q bar of the flip-flop 51. The output Q of the flip-flop 51 is AND
The gates 52a, 52c, and 52f have a flip-flop 5
The output Q bar of 1 is AND gates 52b, 52d, 52e
It is connected to the. Therefore, if the output Q of the flip-flop 51 is "H", the driving pulse P is output from the AND gate 52a.
m is the strobe pulse Ps from the AND gate 52c.
1 is the strobe pulse Ps from the AND gate 52f.
2 is output. The pre-driver 54a has AN
The driving pulse Pm is output from the D gate 52a, the driving pulse Pm and the strobe pulse Ps1 are output to the pre-driver 54b via the OR gate 53a, and the strobe pulse Ps2 is output to the pre-driver 54d via the OR gate 53b. Is done.

Further, the pre-drivers 54a to 54d are connected to driver transistors 55a to 55d, respectively. When the output Q of the flip-flop 51 is “H”, when the drive pulse Pm is output, the driver transistors 55a and 55d are turned on, and the driver transistors 55b and 55c are turned off. So OUT
The drive pulse Pm is output from the first side to drive the motor. When the strobe pulse Ps1 is output, the driver transistors 55a, 55b, and 55c are turned off,
The driver transistor 55d is turned on and OU
The T1 side becomes a high impedance state, and the induced voltage due to the movement of the rotor 70 is detected by the detection inverter 58a. Furthermore, when the strobe pulse Ps2 is output, the driver transistors 55a, 55c, and 55d are turned off, the driver transistor 55b is turned on, the OUT2 side becomes a high impedance state, and the induced voltage due to the movement of the rotor 70 is detected by the detection inverter 5.
8b. On the contrary, flip-flop 51
If the output Q bar is "H", another gate operates and the operation is reversed. As described above, whether the drive pulse Pm, the correction drive pulse Pf, and the strobe pulses Ps1 and Ps2 are output from the output terminal OUT1 or the output terminal OUT2 is switched.

Next, the detection resistor will be described. The value is about 2 kΩ in a normal electronic timepiece, and the detection resistance is usually infinite (not attached), or even if it is attached, 50 times the coil resistance to prevent picking up the induced voltage due to slight rotor movement. One detection resistor of about 100 kΩ is prepared. However, in the present invention, in order to detect a case where the driving force is too large when the voltage is high, a resistance value 5 that is not less than twice and not more than 30 times the coil resistance that is difficult to intentionally pick up the induced voltage.
It is assumed that the detection resistance is about 50 kΩ. In the first embodiment, 10 kΩ, 25 kΩ,
One of three types of detection resistances having a resistance value of 50 kΩ can be selected. In this embodiment, the detection resistors 57b and 57e of 25 KΩ are selected as described above.

The function of the detection resistor will now be described. The detection level of the induced voltage is lower (harder to detect) as the resistance value of the detection resistor is lower, and the detection level of the induced voltage is higher (easier to detect) as the detection resistance is higher. This is because a part of the current of the induced voltage generated in the coil is detected by the detection resistor 57.
This is due to the effect of lowering the detection level by lowering the induced voltage by flowing through b and 57e. Therefore, the smaller the resistance value, the easier the current flows, and the lower the induced voltage. As described above, the lower the resistance value of the detection resistor, the lower the detection level of the induced voltage.
In addition, even when the resistance value of the detection resistor is fixed, the detection level increases when the driving voltage is low, and the detection level decreases when the driving voltage is high. This is because the induced voltage due to the rotation of the rotor 70 is substantially constant irrespective of the drive voltage, whereas the threshold voltage of the detection inverters 58a and 58b increases in proportion to the drive voltage, so that the detection level relatively decreases. It is.

The description of the motor driver circuit 50 will be continued. The OR gate 56 is connected to the detection inverter 5
When 8a and 58b detect the induced voltage, they output to the load detection control circuit 20 as an induced voltage pulse Pv. AND
The gates 23 and 24 respectively have strobe pulses Ps1,
The product of Ps2 and Ps2 is output to the determination circuit 21 as induced voltage pulses Pv1 and Pv2. The determination circuit determines the driving state of the rotor 70 from the induced voltage pulses Pv1 and Pv2 by a method described later, and reduces the driving pulse Pm when the driving force is strong, and decreases the driving pulse Pm when the driving force is weak.
The driving pulse selecting circuit 13 is controlled so as to increase the driving force, and when the driving force is too weak to drive the motor, the driving pulse selecting circuit 13 is controlled so as to increase the driving pulse Pm and the correction driving pulse Pf is output. Let it.

Next, a method of determining the motion state of the rotor 70 by the determination circuit 21 will be described. FIG. 1 is a flowchart showing a method for determining a driving state. After the start, determination A is first performed. Determination A is the first determination of the induced voltage pulse Pv2 (1 ms after the end of the drive pulse Pm). The fractions shown in the judgment symbols in the drawing are the number of the induced voltage pulses Pv1 or Pv2 in which the denominator is a detection opportunity and the numerator is detected. For example, [Pv1,
2/8], it is determined that “present” if two out of eight detection opportunities of the induced voltage pulse Pv1 are detected, and “absent” if the induced voltage pulse Pv2 is not detected only once or once. It is to judge. In the above case, the induced voltage pulse Pv
If 2 is detected twice, the determination is aborted at that point and the process proceeds to the next determination. The determination A is a determination of [Pv2, 1/1]. If the induced voltage pulse Pv2 is detected, the process proceeds to the determination B. Determination B is a determination of [Pv1, 2/6],
When it is determined to be “present” (when two induced voltage pulses Pv1 are detected during six determination opportunities), the determination result is X8. Conversely, if it is determined to be “absent” (when the induced voltage pulse Pv1 is detected once or less during the six determination opportunities), the determination result is X7. Table 1 shows the determination result, the driving state of the rotor 70, and the control of the driving pulse Pm.

[0026]

[Table 1]

On the other hand, if the determination A is "no", the process proceeds to the determination C. Determination C is a determination of [Pv1, 1/1]. When it is determined to be “Yes” in the determination C, the process proceeds to the determination D. The judgment D is a judgment of [Pv2, 1/4] for detecting the induced voltage pulse Pv2 again. If it is determined to be “Yes” in the determination D, the process proceeds to the determination E. The determination E is a determination of [Pv1, 2/8] in which the induced voltage pulse Pv1 is detected again. If it is determined to be “present” in the determination E, the determination result is X5, and if it is determined to be “absent”, the determination result is X1. When the determination D is “No”, the process proceeds to the determination H. The judgment H is a judgment of [Pv1, 1/1].
When it is determined to be “Yes” in the determination H, the process proceeds to the determination J.
Judgment J is [Pv2, 1/4]. When the judgment J is judged as “absent”, the judgment result is X2 and the judgment is “present”.
When the determination is made, the process proceeds to determination K. The judgment K is [Pv
[1, 2/8]]. If it is determined to be “Yes” in the determination K, the result is X3. If it is determined to be “No”, the result is X12.

When the determination H is determined to be “absent”, the process proceeds to the determination M. Determination M is a determination of [Pv2, 1/2]. When the determination is "Yes" in the determination M, the process proceeds to the determination L, and when the determination is "No", the determination result is X9. Determination L is a determination of [Pv1, 2/8]. When it is determined as “Yes” in the judgment L, the judgment result is X4, and “No”.
Is determined, the determination result is X13. Also, judgment C
If it is determined to be “absent”, the process proceeds to determination F. Judgment F
Is the determination of [Pv2,1 / 2]. If it is determined that “No” in the determination F, the determination result is X10, and if it is determined that “Yes”, the process proceeds to the determination G. The judgment G is [Pv1, 2
/ 8]. If it is determined to be “Yes” in the determination G, the determination result is X6, and if it is determined to be “No”, the determination result is X11.

Next, the determination method in the above-mentioned flowchart will be described using an example of an actual current waveform. 3, 4 and 5 are waveform diagrams showing the operation of the present embodiment. FIG. 3-
5A to 5F, Im is a current waveform, and Pv1
And Pv2 are induced voltage pulses. N is the detection level of the induced voltage pulses Pv1 and Pv2 when there is no detection resistor,
N1 and N2 are the detection level of the induced voltage pulse Pv1 when there is a detection resistor and the detection level of the induced voltage pulse Pv2 when there is a detection resistor. Induced voltage pulse P
v1 indicates that the current waveform Im in FIGS.
Detected when it is below 1, the induced voltage pulse P
v2 indicates that the current waveform Im is the detection level N in FIGS.
Detected if above 2. Note that the current waveform I
At m, the sawtooth shape of the drive pulse Pm by the chopper is not necessary for explanation and is omitted. FIG.
3A shows a current waveform when the motor cannot be driven, and FIG. 3B shows a current waveform when the driving force is weak. 3 (c), (d),... Show current waveforms when the driving force is gradually increased. First, the general meaning of each determination in FIG. 1 will be described. First, the determination A is performed at a timing 1 ms after the end of the drive pulse Pm (not shown). Decision A is that the induced voltage pulse P
It is determined whether or not v2 is detected. Conversely, when the induced voltage pulse Pv2 is detected, FIGS.
As shown in (i), there is a peak Iy of the current waveform at the timing a, which is a case where the driving force is strong. When the induced voltage pulse Pv2 is not detected, the case where the motor cannot be rotated as shown in FIG. 3 (a) and the case where the driving force is weak as shown in FIGS. 3 (b) to (e) and FIG. If it is a little strong,
At timing a, the current waveform has a valley Ix before the current waveform peak Iy, and when the driving force is very strong as shown in FIGS. In some cases, Iy has passed and becomes the valley It of the current waveform (or does not exceed the detection level N2). The judgment A is for discriminating between the cases shown in FIGS. 4 (g), (h) and (li) and other cases.

The determination B is a determination for finding the valley It of the current waveform by the induced voltage pulse Pv1 in the cases of FIGS. The valley It of the current waveform appears earlier as the driving force becomes stronger. That is, it is shifted to the left in FIG. Here, the detection opportunity of the judgment B is increased (8
4), (g), (h), and (i) all have the same detection result (the induced voltage pulse Pv1 is detected twice), but by setting the detection opportunity to six times, (FIG. FIG. 4 shows a case where the induced voltage pulse Pv1 cannot be detected twice as in FIG.
The determination can be made by detecting the induced voltage pulse Pv1 twice as in (h) and (li). The reason why two induced voltage pulses Pv1 are detected is to make the detection more reliable. The determination C is for detecting the induced voltage pulse Pv1 at a timing c of 1.25 ms after the end of the drive pulse Pm when the determination A determines “absence”. It is determined whether the induced voltage pulse Pv2 was not detected at the timing a due to the valley Ix or It of the current waveform, or whether the detection could not be detected because the detection level N1 was increased by a combination of the drive voltage and the detection resistor. Things. That is, if the valley Ix of the current waveform continues as shown in FIGS. 3B to 3E, the induced voltage pulse Ps1 is detected at the timing c, and if the detection level N1 is increased as shown in FIG. At timing c, no induced voltage pulse Ps1 is detected. Incidentally, the case where the current waveform is switched from the valley Ix to the peak Iy of the current waveform accidentally between the timing a and the timing c will be described later with reference to FIG.

The judgment D is for detecting the peak Iy of the current waveform when the judgment C judges "yes".
If the peak Iy of the current waveform is up to the timing d5, the induced voltage Pv2 is detected, so that the processing shifts to the judgment E. The determination E is for detecting the valley It of the current waveform when the determination D determines “Yes”. Fig. 3 (b) when it can be driven
As shown in (e), there is a valley It of the current waveform immediately after the peak Iy of the current waveform. Therefore, since the induced voltage pulse Pv1 is detected, the determination E is determined to be “present”. In addition, when the drive cannot be performed, the peak Iyo of the current waveform becomes large and the valley It of the current waveform is not seen as shown in FIG. Therefore, the induced voltage pulse Pv1 is not detected, and the determination E is determined to be “absent”, and the determination result is X1. The determination result X1 is a determination that rotation could not be performed.

In the judgment F, both the judgment A and the judgment C are "none".
If it is determined that the current waveform Im has crossed the detection level N between the timing a and the timing c as shown in FIG. 4F or the detection level N as shown in FIG.
1. It is determined whether or not detection was not possible due to the rise of N2. In the case of FIG. 4F, since the current waveform is the peak Iy at the timing f1, the induced voltage pulse Pv2 is detected, and the determination F is determined to be “present”. And the following decision G
To detect the movement of the rotor 70 by detecting the valley It of the current waveform. In FIG. 5 (L), the detection level N
1, the detection was not possible due to the rise of N2, and the induced voltage pulse Pv2 was not detected. The determination result X10 is a determination that the driving force is very strong.

In the judgments H and M, when the judgment D is judged to be "absent", the induced voltage pulse Pv2 cannot be detected, as shown in FIGS. 2B, 2C and 2D. 5 or the detection level N as shown in FIGS.
This is for distinguishing whether 1 has risen. For this reason, the decision opportunity of decision D is terminated four times and the decision H
Has been migrated to. The determination J is for detecting the peak Iy of the current waveform again when the determination H is determined to be “present”. When the determination J is determined to be “present”, the valley It of the current waveform is detected by the determination K. The determination L is based on the fact that the current waveform Im has crossed the detection level N between the timing d4 and the timing h as shown in FIG. 3D when the determination H is determined to be “absent”, or FIG. , (ヲ), because the detection level N1 has increased, the induced voltage pulse Pv1
Is not detected. FIG.
In the case of (d), the movement of the rotor 70 is detected by detecting the peak Iy of the current waveform again in the determination M and detecting the valley It of the current waveform in the subsequent determination L. Fig. 5 (nu),
In (ヲ), since the detection level N1 has risen and the induced voltage pulse Pv1 was not detected, the determination M is determined to be “absent” and the determination result is X9. The determination result X9 is a determination that the driving force is very strong.

Next, the determination in each driving state will be described in detail. In FIG. 3A, a current waveform Im indicates a current waveform when the motor cannot be driven. The case of the current waveform in FIG. 3A is a case where the voltage is low to some extent even when the load is considered, and the detection levels N1 and N2 when the detection resistor is provided are the detection levels when the detection resistor is not provided. It is almost the same level as N. (Note that this is shown in FIG.
The same applies to (c) and (d)). In FIG. 3A, at timing a, the current waveform Im is a valley I of the current waveform.
Since it is at x, the induced voltage pulse Pv2 is not generated, and the determination A becomes “absent”, and the process shifts to the determination C. Subsequently, at timing c, the current waveform Im still has the detection level N at the valley Ix of the current waveform.
Since it is lower than 1, the induced voltage pulse Pv1 is generated, and the judgment C becomes “Yes”, and the processing shifts to the judgment D. The current waveform Im still remains at the valley I of the current waveform at the timings d1 and d2 in the determination D.
x, which is below the detection level N1, the induced voltage pulse P
Although v2 does not occur, at timing d3, the current waveform Im rises above the detection level N2 at the peak Iyo of the current waveform, and the induced voltage pulse Pv2 is generated. Therefore, the determination D is determined to be “present”, and the process proceeds to the determination E. In the judgment E, the timing waveforms e1 to e8 are all in the range of the peak Iyo of the current waveform, the induced voltage pulse Pv1 is not generated, the judgment E is judged as "absent", and the judgment result X1 is judged. The determination result X1 is a determination that the rotor 70 could not be rotated. The correction drive pulse Pf is generated, and the next drive pulse Pm selects a drive pulse having a drive power larger by two ranks.

In FIG. 3B, the current waveform Im is the rotor 7
0 indicates a current waveform in a case where the driving was performed but the driving force was weak. At the timing a, since the current waveform Im is at the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated, the determination A is determined to be “absent”, and the process proceeds to the determination C. Subsequently, at timing c, since the current waveform Im is still below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, and the determination C is determined to be “present”, and the process proceeds to the determination D. In the determination D, at timings d1 to d4, all are at the valley Ix of the current waveform, so that the induced voltage pulse Pv2 does not occur, the determination D is determined to be “absent”, and the process shifts to the determination H. At timing h, since the current waveform Im is below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, the determination H is determined to be “present”, and the process proceeds to the determination J. In the judgment J, the timing j1 to j4 are all in the range of the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated, and the judgment J is “absent”.
Is determined and the determination result X2 is determined. At the timing j4, the motor has not been driven because the valley It of the current waveform has not yet occurred. Therefore, the timing j
It is fully conceivable that the motor cannot be driven if an external force or the like is applied to the timepiece after 4. Therefore, the determination result X2
Is a determination that it is unknown whether the driving force can be weakly driven, and the driving is reliably performed by generating the corrected driving pulse Pf. Further, the driving pulse Pm is very easily stopped, and the correction driving pulse Pf may be frequently output. Therefore, the next drive pulse Pm selects a drive pulse having a drive power one rank higher.

FIG. 3C shows the current waveform Im when the driving force is slightly higher than that in FIG. This driving force does not frequently generate the correction driving pulse Pf, and can be driven with almost the minimum energy, and is optimal for normal driving. At timing a, the current waveform I
Since m is the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated, the determination A is determined to be “absent”, and the process proceeds to the determination C.
Subsequently, at timing c, since the current waveform Im is still below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, and the determination C is determined to be “present”, and the process proceeds to the determination D. In the determination D, at timings d1 to d4, all are at the valley Ix of the current waveform, so that the induced voltage pulse Pv2 does not occur, the determination D is determined to be “absent”, and the process shifts to the determination H. At the timing h, the current waveform Im is below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, the determination H is determined to be “present”, and the process proceeds to the determination J. In the judgment J, the timings j1 to j3 are in the range of the valley Ix of the current waveform, and the induced voltage pulse Pv2 is not generated. However, at the timing j4, the peak of the current waveform Iy is higher than the detection level N2, the induced voltage pulse Pv2 is generated, the determination J is determined to be “present”, and the process shifts to the determination K. In the judgment K, the timing k1
Until ~ k6, the peak of the current waveform becomes Iy and the induced voltage pulse P
Although no v1 is generated, at timings k7 and k8, the current waveform becomes lower than the detection level N1 at the valley It, and the induced voltage pulse Pv1 is generated, the determination K is determined to be “present”, and the determination result X
3 is determined. The determination result X3 is a determination that the driving force is the optimum driving pulse that can be driven with the minimum energy, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects the driving pulse of the same rank as the current driving pulse.

In FIG. 3D, the current waveform Im indicates that the motor has a slightly higher driving force than in FIG.
From the timing h to the current waveform Im. This driving force can be driven with almost the minimum energy as in FIG. 3B, and is optimal for normal driving. At the timing a, since the current waveform Im has the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated, the determination A is determined to be “absent”, and the process proceeds to the determination C. Subsequently, at timing c, since the current waveform Im is still below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, and the determination C is determined to be “present”, and the process proceeds to the determination D.
At the timing d1 to d4 in the judgment D, the valley I of the current waveform is all
Since it is at x, the induced voltage pulse Pv2 is not generated, and the determination D is determined to be “absent”, and the process shifts to the determination H. However, immediately after the timing d4, the current waveform Im becomes the peak Iy of the current waveform, and at the timing h, the induced voltage pulse Pv1 is not generated and the determination H
Is determined to be “absent”, and the process proceeds to determination M. Timing m1
In this case, the induced voltage pulse Pv2 is generated due to the peak Iy of the current waveform, and the determination M is determined to be “present”, and the process shifts to the determination L. In the judgment L, the peak Iy of the current waveform is obtained from timings 11 to 16.
And the induced voltage pulse Pv1 does not occur. However, at timings 17 and 18, the current waveform becomes lower than the detection level N1 at the valley It, and the induced voltage pulse Pv1 is generated, and the determination L is determined to be “present”, and the determination result X4 is determined. The determination result X4 is a determination that the driving force is the optimum driving pulse that can be driven with the minimum energy, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects the driving pulse of the same rank as the current driving pulse.

FIG. 3E shows a current waveform Im when the motor has a slightly higher driving force than that shown in FIG. 3D. This driving force is also a driving force that can be driven with almost the minimum energy. At the timing a, the current waveform Im has the valley Ix of the current waveform, so that the induced voltage pulse P
v2 does not occur, the determination A is determined to be “absent”, and the process proceeds to the determination C. Subsequently, at timing c, since the current waveform Im is still below the detection level N1 at the valley Ix of the current waveform, the induced voltage pulse Pv1 is generated, and the determination C is determined to be “present”, and the process proceeds to the determination D. In decision D, at timing d1, the induced voltage pulse Pv2 is not generated because the current waveform is at the valley Ix. However, at the timing d2, since the current waveform is above the detection level N2 at the peak Iy, the induced voltage pulse Pv2 is generated, the determination D is determined to be “present”, and the process shifts to the determination E. In the judgment E, the timings e1 to e6 are in the range of the peak Iy of the current waveform, and the induced voltage pulse Pv1 is not generated. However, at the timings e7 and e8, the current waveform becomes lower than the detection level N1 at the valley It, and the induced voltage pulse Pv1 is generated, the determination E is determined to be “present”, and the determination result X5 is determined. The determination result X5 is a determination that the driving force is the optimum driving pulse that can be driven with the minimum energy, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects the driving pulse of the same rank as the current driving pulse.

In FIG. 4F, the current waveform Im is a case in which the motor has a slightly higher driving force than in FIG. 3E and the current waveform Im crosses between the timing a and the timing c. At the timing a, since the current waveform Im has the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated and the determination A
Is determined to be “absent” and the process proceeds to determination C. Subsequently, at timing c, the current waveform Im becomes the peak Iy of the current waveform, the induced voltage pulse Pv1 is not generated, and the determination C is determined to be “absent”, and the process proceeds to the determination F. At timing f1, the current waveform Im rises above the detection level N2 at the peak Iy of the current waveform, and the induced voltage pulse Pv2 is generated.
Move to In the judgment G, at timings g1 to g5, the induced voltage pulse Pv1 is not generated since the current waveform is at the peak Iy. However, at timings g6 and g7, the valley It of the current waveform
Is below the detection level N1, so that the induced voltage pulse Pv
1 is generated, the determination G is determined to be “present”, and the determination result X6 is determined. The determination result X6 is a determination that the driving force is rather strong, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects a driving pulse with a driving force smaller by one rank. By the way, in the current waveform Im, the valley Ix of the current waveform is shallow, so that even at the valley Ix of the current waveform at the timing c, the detection level N1 cannot be exceeded and the induced voltage pulse Pv1
May not occur. However, the valley It of the current waveform is sufficiently large, and the induced voltage pulse Pv1 is generated. Therefore, the above-described determination result is obtained, and the next drive pulse Pm selects a drive pulse having a drive power smaller by one rank.

In FIG. 4 (g), the current waveform Im is a case where the motor has a slightly higher driving force than in FIG. 4 (f), and at timing a, the current waveform peak Iy is higher than the detection level N2. Therefore, at timing a, the induced voltage pulse Pv2
Is generated, the determination A is determined to be “present”, and the process proceeds to the determination B. At the timing b1 to b5 in the judgment B, the peak I of the current waveform
Since it is at y, no induced voltage pulse Pv1 is generated, but at timing b6, since it is below the detection level N1 at the valley It of the current waveform, the induced voltage pulse Pv1 is generated. However, since the determination B is terminated at six detection occasions, only one induced voltage pulse Pv1 is generated, and the determination B is determined to be “absent” and the determination result X7 is determined. The determination result X7 is a determination that the driving force is rather strong, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects a driving pulse with a driving force smaller by one rank.

In FIG. 4H, the current waveform Im shows a case where the driving force of the motor is further increased and the peak Iy of the current waveform partially overlaps the peak Ip of the current waveform due to the driving pulse Pm. At timing a, since the voltage is above the detection level N2, the induced voltage pulse Pv2 is generated, and the determination A is determined to be “present”, and the process proceeds to the determination B. Timing b1 to b4 in judgment B
In this example, the induced voltage pulse Pv1 is located at the peak Iy of the current waveform.
Does not occur. However, at timings b5 and b6, the induced voltage pulse Pv1 is generated because the current waveform is below the detection level N1 at the valley It. Therefore, the determination B is determined to be “Yes” and the determination result X8 is determined. The determination result X8 is a determination that the driving force is strong, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects a driving pulse with a driving force smaller by two ranks.

In FIG. 4 (I), the current waveform Im shows the case where the driving force of the motor is further increased. At the timing a, the current waveform becomes the latter half of the peak Iy and is above the detection level N2, so that the induced voltage pulse Pv2 is generated.
Is determined to be “present” and the process proceeds to the determination B. In the judgment B, at timings b1 and b2, the induced voltage pulse Pv1 is not generated since the current waveform is still at the peak Iy, but timings b3 and b
In 4, the induced voltage pulse Pv1 is generated because the current waveform is below the detection level N1 at the valley It. Therefore, the determination B is determined to be “Yes” and the determination result X8 is determined. The determination result X8 is a determination that the driving force is strong, the correction driving pulse Pf is not generated, and the next driving pulse Pm selects a driving pulse with a driving force smaller by two ranks.

In FIG. 5 (n), the current waveform Im shows a case where the driving force is further increased. The peak Iy of the current waveform completely overlaps the peak Ip of the current waveform due to the drive pulse Pm. At timing a, the induced voltage pulse Pv2 is not generated since the current waveform is already at the valley It, and the determination A is determined to be “absent” and the process proceeds to the determination C. Subsequently, at timing c, since the current waveform Im is still below the detection level N1 at the valley It of the current waveform, the induced voltage pulse Pv1 is generated. In the determination D, at timings d1 to d4, all are at the valley Ix of the current waveform, so that the induced voltage pulse Pv2 does not occur, the determination D is determined to be “absent”, and the process shifts to the determination H. At the timing h, the current waveform Pm is near the detection level N, and is located at the peak Iy2 of the current waveform, and cannot exceed the detection level N1.
Therefore, the induced voltage pulse Pv1 is not generated, and the determination H is “absent”.
And the process proceeds to determination M. At timings m1 and m2, the range from the valley It of the current waveform to the peak Iy of the current waveform cannot be exceeded, and the induced voltage pulse Pv1 is not generated. Therefore, the judgment M is “none”
Is determined, and the determination result is X9. Judgment result X9
Indicates that the driving pulse has a very strong driving force, no correction driving pulse Pf is generated, and the next driving pulse P
m selects a driving pulse with a driving force smaller by three ranks.

In FIG. 5 (l), the current waveform Im is the same as that of the motor shown in FIG. 5 (nu), but the detection levels N1 and N2 are further increased and the valley It of the current waveform cannot be detected. At the timing a, since the current waveform Im has the valley Ix of the current waveform, the induced voltage pulse Pv2 is not generated, the determination A becomes “absent”, and the process shifts to the determination C. Subsequently, at timing c, the current waveform Im is at the valley It of the current waveform, but cannot exceed the detection level N1, and the induced voltage pulse Pv1 is not generated. . However, since the timings f1 and f2 are both at the valley It of the current waveform, the induced voltage pulse Pv2 is not generated, the determination F is determined to be “absent”, and the determination result X10 is determined. The determination result X10 is a determination that the driving force is very strong when the voltage is high, and the correction driving pulse P
f does not occur, and the next driving pulse Pm selects a driving pulse having a driving force smaller by three ranks.

In FIG. 5 (ヲ), the current waveform Im shows the case where the driving force is further increased. Also in this case, FIG.
Although the current waveform Iy3 is larger than that of (L), the determination is exactly the same as that of FIG. Therefore, there is no problem because the determination is completed before the peak Iy3 of the current waveform exceeds the detection level N2. In the same manner as described above, the correction drive pulse Pf is not generated, and the next drive pulse Pm selects a drive pulse having a drive power smaller by three ranks. Note that FIG. 5 (ヲ) shows an example in which the same determination as in FIG. 5 (nu) is made. Similarly, the determination of FIG. 5 (W) is exactly the same as that of FIG. 5 (N) or (L).

FIG. 5 (f) shows another example of the current waveform Im when the driving force is further increased as compared with FIG. 5 (ヲ). In this current waveform, no valley of the current waveform is seen immediately after the peak Ip of the current waveform due to the drive pulse Pm. Therefore, at timing a, since the detection level N2 is exceeded, the induced voltage pulse Pv2 is generated, and the determination A is determined to be “present”, and the process proceeds to the determination B. At the timings b1 to b6 in the determination B, the current waveform is at the peak Iy or cannot exceed the detection level N1, and the induced voltage pulse Pv1 is not generated. Therefore, the determination B is determined to be “absent” and the determination result X7 is determined. The determination result X7 is the same as the determination result of FIG.
No correction drive pulse Pf is generated, and the next drive pulse Pm selects a drive pulse with a drive power smaller by one rank. The determination result in this case is a driving pulse Pm having a very strong driving force, but is reduced by one rank. However, since the drive pulse Pm is selected to be small even in one rank, it takes some time until the optimum drive pulse Pm is obtained, but there is no problem in practical use.

The judgment result X which did not appear in the above description
The correction driving pulse Pf is generated for 11, X13, and X12, which are abnormal current waveforms that cannot be considered normally and that the rotor 70 is not rotating. In order to make the driving force different, the next driving pulse Pm
Selects a driving pulse having a driving force one rank higher. As described above, when the drive voltage is high by the detection resistor, the detection levels N1 and N2 are made dull to appropriately determine the current waveform, and the optimum drive pulse Pm is selected.

Next, a second embodiment will be described. The second embodiment is an example in which the present invention is applied to a high-speed driving pulse. While the drive pulse Pm of the first embodiment is controlled to minimize the current consumption, the high-speed drive pulse outputs a drive pulse with a strong driving force even if the current consumption is increased to some extent. In the case of the drive pulse Pm, even if the rotation cannot be performed, the drive pulse Pm is reliably driven by the correction drive pulse Pf output 32 ms later.
This is because the high-speed drive pulse must be driven at a high speed of 64 Hz, so that there is no time to provide a correction drive pulse, and it is necessary to reliably drive only with the high-speed drive pulse. Conventionally, in an electronic timepiece using a silver battery, since the voltage is constant, it is sufficient to prepare one high-speed driving pulse as the high-speed driving pulse. However, in an electronic timepiece having a storage means with voltage fluctuation, a single high-speed driving pulse has a problem that when the voltage is low, the driving force is weak, and when the voltage is high, the driving force is too strong, causing an overrun and causing the time to be out of order. Occurs. The second embodiment is an example for solving this problem.

The second embodiment will be described in detail with reference to the drawings. FIG. 7 is a circuit configuration diagram showing a circuit configuration of an electronic timepiece according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The main difference from the first embodiment is that the drive pulse generation circuit 10 is replaced with a high-speed drive pulse generation circuit 110, and a voltage detection circuit 80 and a detection resistance control circuit 81 for controlling the resistance selection transistors 59a to 59f are added. Thus, the other components are exactly the same as in the first embodiment.

The differences from the first embodiment will be described in more detail. The high-speed drive pulse generating circuit 110 generates a plurality of high-speed drive pulses Pk having different chopper ratios based on a signal from the oscillation frequency dividing circuit 3.
1, a high-speed drive pulse selection circuit 113 for selecting one from a plurality of high-speed drive pulses Pk created by the high-speed drive pulse creation circuit 111, and a correction drive pulse output when it is determined that the motor could not be rotated. A correction drive pulse generation circuit 112 for generating Pf; and a correction drive pulse Pf when it is determined that the motor cannot be rotated.
Gate 115 for passing the high-speed drive pulse P
The OR gate 114 outputs k or the correction drive pulse Pf to the motor driver circuit 50.
The high-speed driving pulse Pk generated by the high-speed driving pulse generating circuit 111 is exactly the same as the driving pulse Pm of the first embodiment. The correction drive pulse Pf generated by the correction drive pulse generation circuit 112 and the strobe pulse generation circuit 21
Are the same for the strobe pulses Ps1 and Ps2.

Next, the operation of the voltage detection circuit 80 will be described. The secondary battery 2 causes a voltage fluctuation in a range of 1.2 V to 2.8 V in normal use. The voltage detection circuit 80 detects the voltage of the secondary battery 2 and outputs 1.2V to 1.6V and 1.6V to 2.V.
The voltage in the three ranges of 4 V and 2.4 V to 2.8 V is transmitted to the detection resistance control circuit 81. The detection resistance control circuit 81 controls the resistance selection transistors 59a to 59f based on the detection result of the voltage detection circuit 80, and selects the detection resistances 57a to 57f. That is, when the voltage of the secondary battery 2 is 1.2 V to 1.6 V, the signal 81 c is set to “L”,
By setting 1a and 81b to "H", the resistance selecting transistors 59c and 59f are turned ON, and the resistance selecting transistor 5
9a, 59b, 59d and 59e are turned off, and the detection resistors 57c and 57f of 50 kΩ are selected. 1.6V ~
At 2.4 V, the signal 81b is set to "L",
By setting c to “H”, the resistance selecting transistor 59
b and 59e are turned on, and the resistance selecting transistors 59a and 59e are turned on.
9c, 59d and 59f are turned off, and the detection resistors 57b and 57e of 25 kΩ are selected. When the voltage is between 2.4 V and 2.8 V, the signal 81a is at "L" and the signals 81b and 81c are at "H".
, The resistance selection transistors 59a, 59d are turned ON, and the resistance selection transistors 59b, 59c, 59
e, 59f are turned off, and the detection resistors 57a,
Select 7d. Accordingly, when the voltage is high, the detection resistance of the rotor 70 is improved by selecting the detection resistances 57a and 57d having smaller resistance values. The voltage detection circuit 80 controls the high-speed drive pulse selection circuit 113 to control the required high-speed drive pulse P in each of the three voltage ranges.
k is selected, and control is performed so that the high-speed drive pulse Pk that is not unnecessarily small or too large is not selected.

Next, the determination method and the control of the high-speed drive pulse Pk will be described. Even when driven by the high-speed drive pulse Pk, the current waveforms are as shown in FIGS.
(I), the waveform is exactly the same as the current waveform Im shown in FIGS. 5 (N) to (F), and the determination method is exactly the same using the flowchart shown in FIG. However, the control of the determination result and the subsequent high-speed drive pulse Pk is different from that of the first embodiment. An example will be described below. Figure 3 (a)
Is the case where rotation was not possible, and is determined to be the determination result X1 as in the first embodiment. In this case, the high-speed driving is temporarily stopped to generate the correction driving pulse Pf, and the next high-speed driving pulse Pk selects a high-speed driving pulse having a driving power larger by three ranks. Table 2 shows the detection result of the second embodiment, the driving state of the rotor 70, and the control of the high-speed driving pulse Pk.

[0053]

[Table 2]

FIG. 3 (b) shows a current waveform in the case where the driving was performed but the driving force was weak. In this case, it is determined that the determination result is X2. Also in this case, the high-speed driving is temporarily stopped to generate the correction driving pulse Pf, and the next high-speed driving pulse Pk becomes 2
A high-speed driving pulse with a driving power of a rank is selected. Also, in FIGS. 3 (c) to 3 (e), 4 (f) and 4 (g), although the rotation is possible, the driving force is slightly weak at high speed driving. Therefore, in the determination results X3 and X4 of FIGS. 3C and 3D, the correction driving pulse Pf is not generated, and the next high-speed driving pulse Pk selects a high-speed driving pulse having a driving power larger by two ranks. 3 (e), 4 (f) and 4 (g), the determination result X5,
In X6 and X7, the correction driving pulse Pf is not generated, and the next high-speed driving pulse Pk selects a high-speed driving pulse having a driving power larger by one rank.

FIGS. 4 (H) and 4 (I) show an optimum drive having sufficient driving force for high-speed drive. Therefore, FIG.
In the determination result X8 of (i), the correction drive pulse Pf is not generated, and the next high-speed drive pulse Pk selects the high-speed drive pulse of the same rank as the current one. However, FIG. 5 (nu), (le),
(ヲ) is one in which the driving force is further increased and the driving force is too strong beyond necessity. Therefore, FIG. 5 (nu), (ru),
In the determination results X9 and X10 of (ヲ), the correction drive pulse Pf
Does not occur, and the next high-speed driving pulse Pk selects a high-speed driving pulse with a driving force smaller by one rank. In addition, FIG.
The high-speed driving pulse Pk having a driving force that is too strong as in (f) does not appear because the high-speed driving pulse selection circuit is controlled by the voltage detection circuit 80.

[0056]

As is apparent from the above description, the present invention determines the rotor movement in more detail by setting the detection resistor to a value larger than that of a normal electronic timepiece in an electronic timepiece having power storage means with voltage fluctuation. You can do it. Therefore, the driving pulse is controlled so as to always be driven with the lowest energy as shown in the first embodiment, or the high-speed driving pulse is controlled so as to have an optimum driving force as shown in the second embodiment. It becomes possible. Although the example in which the detection resistor is selected by the voltage in the second embodiment has been described, the detection resistor may be selected by the magnitude of the driving pulse.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a determination method according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a first embodiment of the present invention.

FIG. 3 is a waveform chart showing the operation of the first embodiment of the present invention.

FIG. 4 is a waveform chart showing the operation of the first embodiment of the present invention.

FIG. 5 is a waveform chart showing the operation of the first embodiment of the present invention.

FIG. 6 is a waveform diagram showing a drive pulse Pm, a correction drive pulse Pf, and strobe pulses Ps1 and Ps2 according to the first embodiment of the present invention.

FIG. 7 is a circuit diagram of a second embodiment of the present invention.

FIG. 8 is a waveform chart showing the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell 2 Secondary battery 10 Drive pulse generation circuit 11 Drive pulse generation circuit 12 Correction drive pulse generation circuit 13 Drive pulse selection circuit 20 Load detection control circuit 21 Judgment circuit 22 Strobe pulse generation circuit 50 Motor driver circuit 57a to 57f Detection resistance Reference Signs List 60 coil 70 rotor 80 voltage detection circuit 81 detection resistance control circuit 110 high-speed drive pulse generation circuit Im current waveform N, N1, N2 detection level Pv1, Pv2 induced voltage pulse

Claims (4)

[Claims] 1. A power generating means, a power storage means with voltage fluctuation, a step motor comprising a coil, a stator and a rotor, a detecting means for detecting an induced voltage generated in the coil when the rotor moves, and a detecting means Determining means for determining the motion of the rotor based on the detection result of
Strobe pulse generating means for generating a first strobe pulse group and a second strobe pulse group for detecting the induced voltage, a detection resistor for determining a detection level of the induced voltage, and determination by the determination means In an electronic timepiece having a driving pulse control means for controlling a driving pulse for driving the step motor according to a result, the detection resistor sets a detection level of the induced voltage when a driving voltage for driving the step motor is high. An electronic timepiece wherein the resistance is set to be at least twice and at most 30 times the resistance value of the coil so as to make it dull. 2. The electronic timepiece according to claim 1, wherein said determination means alternately switches the outputs of said first strobe pulse group and said second strobe pulse group until a determination result is obtained. 3. The driving pulse control means selects a driving pulse capable of always driving with the minimum energy from the prepared driving pulses according to the result of the judgment by the judging means. Item 6. The electronic timepiece according to item 1 or 2. 4. The drive pulse control means selects a drive pulse several stages larger than a drive pulse capable of always driving with the minimum energy from the prepared drive pulses according to the determination result of the determination means. 3. The electronic timepiece according to claim 1, wherein