JPH0824488A - Power switch circuit of washing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Even when the microcomputer runs out of control, the power can be turned off by operating the push switch for turning off the power, and moreover, the wrong judgment of the power off state by the microcomputer is prevented. The power switch circuit of the washing machine of the present invention is provided with a normally open push switch 81 for turning on the power and a normally closed push switch 75 for turning off the power, and a normally open push switch by a microcomputer 67 and a thyristor 77. In a configuration in which the relay 51 of the power supply line 44 is turned on when the switch 81 is operated and the relay 51 is turned off when the normally closed push switch 75 is operated, depending on the on / off state of the relay 51. A voltage signal generating means 56 for generating a voltage signal is provided, and the microcomputer 67 determines that the power is turned off when the voltage signal indicating the off state of the relay 51 continues for a set time, and also determines the power off during the dehydration operation. The above-mentioned set time is set to be long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power switch circuit of a washing machine for driving and controlling a relay as a power switch provided in a power line of a load in response to an operation of a push switch for powering on or powering off. Regarding

[0002]

2. Description of the Related Art An example of a power switch circuit of this type is shown in FIG. In FIG. 8, a load such as a motor (not shown) is connected between the power supply lines 2 and 3 derived from the AC power supply 1. A relay switch 4 a of the relay 4 is provided on the one power supply line 2. A series circuit including a relay coil 4b of the relay 4 and an NPN transistor 5 is connected between the DC power supply terminal V and the ground. Between the base of the transistor 5 and the DC power supply terminal V, a series circuit including a PNP type transistor 6 and a resistor 7 is connected. The base of the transistor 6 is connected to the port 10a of the microcomputer 10 via the resistors 8 and 9. In the microcomputer 10, an NPN for setting the voltage level of the port 10a to high level or low level
Shaped transistor 11 is provided.

A normally open push switch 12 for turning off the power source is connected between the DC power supply terminal V and the intermediate connection point of the resistors 8 and 9, and the intermediate connection point is the microcomputer 10. It is connected to port 10b. In addition, the normally open push switch 13 for powering on
Is connected between the DC power supply terminal V and the port 10c of the microcomputer 10.

In the above structure, when the push switch 13 for powering on is turned on, the port 10c of the microcomputer 10 becomes high level, the microcomputer 10 recognizes the on operation of the push switch 13, and the transistor 11 is turned on. Is turned on to bring the port 10a to a low level. As a result, the transistor 6 is turned on and the transistor 5 is turned on, so that the relay coil 4b is energized and driven, so that the relay switch 4a is turned on (that is, the power switch is turned on).

On the other hand, when the push switch 12 for turning off the power is turned on while the relay switch 4a is turned on, the intermediate connection point between the resistors 8 and 9 becomes high level, so that the transistor 6 is turned on. At the same time as it is turned off, the transistor 5 is turned off, so that the relay coil 4b is cut off and the relay switch 4a is turned off (that is, the power switch is turned off). At the same time, the port 10b of the microcomputer 10 becomes high level, and the microcomputer 10 recognizes the ON operation of the push switch 12 and turns off the transistor 11 to turn the port 10b on.
Set a to high level. As a result, the off state of the transistor 6 and the off state of the transistor 5 are held, so that the relay switch 4a is held off (that is, the power switch is off).

[0006]

However, in the above conventional configuration, if the microcomputer 10 runs away for some reason and the port 10a remains at the low level while the power is on, the power is turned off. Even if the push switch 12 for the power switch is turned on, the power may not be turned off. Specifically, when the push switch 12 for powering off is turned on, the intermediate connection point between the resistors 8 and 9 becomes high level and the transistors 6 and 5 can be turned off while the push switch 12 is turned on. However, when the operation of the push switch 12 is stopped, the port 10a of the microcomputer 10 remains at the low level, and the transistors 6 and 5 are turned on again.

On the other hand, the inventor of the present invention has considered a power supply switch circuit which can surely turn off the power supply by operating a push switch for powering off even if the microcomputer runs out of control. . The configuration of this power switch circuit will be briefly described below. The power supply switch circuit includes a relay provided in a power supply line of a load, a first transistor for switching the relay, a second transistor for on / off controlling the first transistor, and a second transistor for turning on / off the second transistor. A series circuit for controlling, a normally closed push switch for turning off the power source and a thyristor, a normally open push switch for turning on the thyristor, and a normally open push switch for turning on the power source. And a microcomputer as a control means for supplying a driving DC voltage to each of the first transistor and the thyristor when receiving an on-switch signal from.

In the above structure, when the normally-open push switch for turning on the power is turned on to turn on the relay (power supply), the microcomputer supplies the driving DC voltage to the first transistor and the thyristor, respectively. The thyristor is turned on at the same time.
This turns on the second transistor, turns on the first transistor, and turns on the relay.

Next, when the normally closed push switch for turning off the power is operated to turn off the relay (power supply) in the ON state of the relay, the thyristor is cut off, so that the second transistor is turned off. At the same time, the first transistor is turned off and the relay is turned off. In this case, even if the microcomputer runs out of control, the thyristor can be turned off by operating the normally closed push switch for turning off the power, so that the relay, that is, the power can be turned off without fail.

By the way, in the case of the above configuration, since the normally closed push switch for turning off the power is connected in series to the thyristor, the switch signal of the normally closed push switch cannot be given to the microcomputer. Therefore, the microcomputer cannot determine whether or not the normally closed push switch has been operated, that is, whether or not the relay has been turned off. Therefore, the present inventor considered the following configuration as a configuration in which the microcomputer determines whether or not the relay (power supply) is turned off.

According to this structure, the voltage signal generating means for generating the voltage signal having the voltage level corresponding to the ON / OFF state of the relay is provided, and the voltage level of the voltage signal output from the voltage signal generating means is relayed by the microcomputer. It is configured to determine that the power supply is turned off when it continues for a set time (a predetermined fixed time, for example, 64 ms) with the voltage level corresponding to the off state of. With this configuration, the microcomputer can reliably determine whether the relay (power supply) is turned off.

However, in the washing machine having the power switch circuit of the above construction, the relay (relay switch) may be turned off for a short time due to the vibration generated in the washing machine body during the dehydration operation. If the time during which the relay is off is longer than the set time for determining that the power is off, the microcomputer may make an erroneous decision.

Therefore, an object of the present invention is to reliably turn off the power supply by operating the push switch for powering off even if the microcomputer as the control means runs out of control. (EN) It is possible to provide a power switch circuit of a washing machine which can surely prevent an erroneous determination of a relay (power) off state by a computer.

[0014]

A power switch circuit for a washing machine according to the present invention includes a relay provided in a power line of a load, a first transistor for switching the relay, and the first transistor. A second transistor for on / off control, a series circuit for controlling the second transistor on / off and comprising a power-off normally closed push switch and a thyristor, and for turning on the thyristor And a control means for supplying a driving DC voltage to each of the first transistor and the thyristor when receiving an on-switch signal from the power-on normally open push switch. Voltage signal generating means for generating a voltage signal of a voltage level according to the on / off state of the relay Equipped with a power supply state determination means for determining that the power supply has been turned off when the voltage level of the voltage signal output from the voltage signal generation means continues for a set time with the voltage level corresponding to the off state of the relay, Further, the power state determination means is characterized in that the set time for power off determination is set long during the dehydration operation.

Further, in place of the configuration in which the set time for determining the power-off during the dehydration operation is set to be long, a vibration detecting means for detecting the vibration of the washing machine body is provided, and the power supply state determining means is the voltage signal generating means. When the vibration is detected by the vibration detecting unit when the voltage level of the voltage signal from the voltage level corresponding to the OFF state of the relay continues for a set time, the determination of power OFF is canceled. It is also preferable to

Further, in the case of this construction, the power supply state judging means is configured to detect the vibration when the voltage level of the voltage signal from the voltage signal generating means continues for the set time with the voltage level corresponding to the OFF state of the relay. It may be possible to set the set time for the power-off determination to be long while the vibration is being detected. It is also preferable that the vibration detecting means is composed of an unbalanced detection switch for detecting abnormal vibration of the tank.

[0017]

According to the above means, when the relay (power source) is turned on, when the normally open push switch for turning on the power source is turned on, the control means supplies the driving DC voltage to the first transistor and the thyristor, respectively. The thyristor is turned on at the same time. As a result, the second transistor is turned on, the first transistor is turned on, and the relay is turned on. When the normally closed push switch for turning off the power is operated while the relay is on, the thyristor is cut off.
The transistor is turned off, the first transistor is turned off, and the relay is turned off. In this case, even if the control means runs out of control, the thyristor can be turned off by operating the normally-closed push switch for turning off the power supply, so that the relay (power supply) can be surely turned off.

In the above arrangement, the voltage signal generating means for generating the voltage signal having the voltage level corresponding to the ON / OFF state of the relay is provided, and the voltage level of the voltage signal output from the voltage signal generating means by the power supply state judging means. Since the configuration is such that it is determined that the power supply is turned off when the voltage level corresponding to the off state of the relay continues for the set time, it can be determined whether the relay (power supply) is off. In addition, since the power supply state determination means is configured to set the set time for power-off determination to be long during the dehydration operation, it is possible to reliably determine the erroneous determination of the OFF state of the relay due to the vibration during the dehydration operation. Can be prevented.

Further, it is provided with a vibration detecting means for detecting the vibration of the washing machine body, and the power supply state judging means sets the voltage level of the voltage signal from the voltage signal generating means while keeping the voltage level corresponding to the OFF state of the relay. When the vibration is detected by the vibration detecting means when the time continues, if the power off judgment is canceled, it is possible to reliably prevent the erroneous judgment of the off state of the relay due to the vibration during the dehydration operation. can do. Further, in the case of this configuration, the power supply state determination means causes the vibration detection means to generate a vibration when the voltage level of the voltage signal from the voltage signal generation means continues for the set time with the voltage level corresponding to the OFF state of the relay. Even if the power-off determination set time is set to be long while the detection is being performed, it is possible to reliably prevent erroneous determination. Further, if the vibration detecting means is composed of an unbalanced detection switch for detecting abnormal vibration of the tank, the parts can be shared, so that the manufacturing cost can be reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a fully automatic washing machine will be described below with reference to FIGS.
First, in FIG. 3 showing a schematic overall configuration of a fully automatic washing machine, an outer tub 22 for storing water is provided in an outer box 21 so as to be swingable via an elastic suspension mechanism. In the outer tub 22, a rotary tub 23 serving as both a washing tub and a dehydration basket is provided.
Is provided, and an agitator 24 for washing is provided on the inner bottom portion of the rotary tub 23. A motor 25 and a drive mechanism 26 are arranged on the outer bottom of the outer tub 22. The motor 25 is composed of, for example, a condenser motor that can rotate in forward and reverse directions. The drive mechanism section 26 is
At the time of washing, the rotary tub 23 is stopped and the rotational force from the motor 25 is reduced to be transmitted to the agitator 24 to rotate the agitator 24. At the time of dehydration, the rotational force from the motor 25 is applied to the rotary tub 23 and the agitator 24. It is configured to transmit both at high speed.

Further, a motor type drain valve 27 and a drain hose 28 are provided in the outer lower portion of the outer tub 22, and the drain valve 27 and the drain hose 28 drain the water in the outer tub 22 to the outside. It is configured to do. And the outer box 21
A top cover 29 is attached to the upper part of the. The top cover 29 is provided with, for example, a half-foldable lid 30 that can be opened and closed. The lid 30 is rotatably provided with a shaft 31 at the rear end thereof as a fulcrum of rotation.

The opened / closed state of the lid 30 is the top cover 2.
It is configured to be detected by a lid switch 32 arranged at the rear portion of the inside 9. An operator 32a (see FIGS. 4 and 5) of the lid switch 32 is operated via a swinging portion 33 and a transmission lever 34 that are provided at the rear end of the lid 30 so as to project. Specifically, as shown in FIG.
In the state where the lid 30 is closed, the upper end portion 3 of the rear lever portion 36 integrated with the transmission lever 34 by the coil spring 35.
6a is pushing in the operation element 32a of the lid switch 32, so that the lid switch 32 is turned on, for example. On the other hand, when the lid 30 is opened, as shown in FIG.
The transmission lever 34 rotates counterclockwise around the shaft 37 as a rotation center, and the upper end portion 36a of the rear lever portion 36 of the transmission lever 34 does not push the operation element 32a of the lid switch 32, so that the lid switch 32 is For example, it is turned off.

As shown in FIG. 4, the rear lever portion 36 of the transmission lever 34 has a lower end portion 36b extending downward so as to be positioned laterally of the outer tub 22.
In the case of this configuration, when the rotating tank 23 abnormally vibrates during the dehydration operation, the outer tank 22 also abnormally vibrates, and its peripheral side portion hits the lower end portion 36b of the transmission lever 36 and pushes it. Then, the rear lever portion 36 rotates around the fulcrum portion 38 as a rotation center against the spring force of the coil spring 35, and the lid switch 3
The lid switch 32 is turned on by pushing in the second operator 32a. That is, the lid switch 32 constitutes an unbalanced detection switch for detecting abnormal vibration of the tank.

At the rear of the top cover 29, an electromagnetic water supply valve 39 (see FIG. 1) for supplying water into the tank, and a water level sensor 40 including a pressure sensor for detecting the water level in the tank (see FIG. 1) are used. 1) is provided. Further, an operation panel 41 (see FIG. 2) is provided on the front upper surface of the top cover 29. On the other hand, as shown in FIG.
On the outer periphery of the upper portion of the outer tub 22, a vibration sensor 42 including a piezoelectric element, for example, is arranged as a vibration detecting means. The vibration sensor 42 has a function of detecting the vibration of the outer tub 22 (and thus of the main body of the washing machine) and outputting a vibration detection signal according to the magnitude of the vibration.

Now, in FIG. 1 showing the electrical construction of the fully automatic washing machine, a power supply line 4 derived from an AC power supply 43.
A motor 25 as a load, an electromagnetic water supply valve 39, and a motor type drain valve 27 are connected in parallel between Nos. 4 and 45. In this case, the triac 46 is connected between the forward rotation terminal 25a of the motor 25 and the power supply line 44, and the triac 47 is connected between the reverse rotation terminal 25b and the power supply line 22. A capacitor 48 is connected between the terminals 25a and 25b of the motor 25.

Further, the electromagnetic water supply valve 39 is constructed so that it is electrically connected and disconnected by a triac 49 connected in series. Further, the motor-type drain valve 27 is configured to be electrically connected and disconnected by the triac 50 connected in series.
The relay switch 51a of the relay 51 is provided on the one power supply line 44.

Here, in order to detect whether or not the relay switch 51a is turned on, the detection resistors 52 and 53 are provided.
And the series circuit composed of the diode 54 is the power line 4.
It is connected between 4 and 45 in parallel with the above loads. A capacitor 55 is connected to both ends of the detection resistor 52. Further, one end of the detection resistor 52 (the relay switch 51
The terminal on the side connected to a) is connected to the DC constant voltage terminal Vcc of + 5v, for example. With this configuration,
The intermediate connection point A between the detection resistors 52 and 53 is a signal output terminal, and the voltage signal output from this signal output terminal is +5 V when the relay switch 51a is in the off state, and when the relay switch 51a is in the on state. It is configured to be + 1V. That is, the on / off state of the relay switch 51a can be known from the level of the voltage signal from the signal output terminal. In this case, the detection signal 52, 53, the diode 54, the capacitor 55 to the voltage signal generating means 56.
Is configured.

On the other hand, a DC power supply circuit 57 is connected between the power supply lines 44 and 45. This DC power supply circuit 57
Is composed of a transformer 58, a full-wave rectifier circuit 59, and a smoothing capacitor 60. One end of the smoothing capacitor 60 serves as a DC voltage terminal Vpow.
The other end of 0 is grounded. Further, a constant voltage circuit 61, which is a DC voltage circuit, is provided at both ends of the smoothing capacitor 60.
Is connected. The constant voltage circuit 61 is composed of an NPN transistor 62, a zener diode 63, a resistor 64, and a capacitor 65 as a countermeasure against instantaneous blackout, and the emitter of the transistor 62 has a DC voltage terminal Vcc.
Has become. The constant voltage circuit 61 is configured so that the output voltage can be maintained at a constant voltage by the charge charged in the capacitor 65 when an instantaneous power failure occurs.

Further, the triacs 46, 47, 49, and 50 for turning on and off the respective loads are configured to be on / off controlled by a control means, for example, a microcomputer 67 via the driving LSI 66. Specifically, the gates of the triacs 46, 47, 49, 50 are connected to the ports 66a to 66d of the LSI 66. Further, the microcomputer 67 has a function of controlling the entire washing operation of the fully automatic washing machine, and stores a control program therefor in an internal memory. The microcomputer 67 serially communicates a control signal for controlling ON / OFF of each triac to the LSI 66, so that the LSI 66 controls ON / OFF of each triac, and accordingly, the motor 25 is energized in the forward direction, the reverse direction, or the off state. The electromagnetic water supply valve 39 can be electrically disconnected and the motor drain valve 27 can be electrically disconnected.

Between the DC voltage terminal Vpow of the DC power supply circuit 57 and the port 66e of the LSI 66, the resistor 68, the relay coil 51b of the relay 51 and the first transistor 6 composed of, for example, an NPN type transistor are provided.
9 are connected in series. A resistor 70 is connected between the base and emitter of the transistor 69. A diode 71 of the illustrated polarity is connected to both ends of the relay coil 51b. Further, between the base of the transistor 69 and the DC constant voltage terminal Vcc of the constant voltage circuit 61, a resistor 72 and a second transistor 73 composed of, for example, a PNP type transistor are connected in series. A resistor 74 is connected between the base of the second transistor 73 and the DC constant voltage terminal Vcc.

The base of the second transistor 73 and L
A series circuit including a normally-closed push switch 75 for turning off the power source, a resistor 76, and a thyristor 77 is connected to the SI port 66f. Here, a capacitor 78 is connected between the intermediate connection point between the push switch 75 and the resistor 76 and the ground. In this case, the capacitor 78 is configured to be connected in parallel with the thyristor 77. It should be noted that the LSI 66 is provided with a control signal (the LSI 66) supplied from the microcomputer 67.
Of the ports 66e and 66f), the ports 66e and 66f are set to a high level or a low level.

Between the gate of the thyristor 77 and the DC constant voltage Vcc, a series circuit composed of a resistor 79, a diode 80 of the illustrated polarity, and a normally open push switch 81 for powering on is connected. A series circuit including a capacitor 82 and a resistor 83 and a resistor 84 are connected in parallel between an intermediate connection point between the resistor 79 and the diode 80 and the ground. A resistor 85 is connected between the gate of the thyristor 77 and the port 66f of the LSI 66.

Furthermore, the intermediate connection point between the normally open push switch 81 and the diode 80, and the microcomputer 67.
Between the port 67a of the
Is connected. A resistor 87 is connected between the port 67a of the microcomputer 67 and the ground. Further, the port 67 of the microcomputer 67
The signal output terminal of the voltage signal generating means 56 (intermediate connection point A between the detection resistors 52 and 53) is connected to b.

Further, a portion of the power supply lines 44, 45 near the AC power source 43 is provided with an instantaneous blackout detection circuit 88, which is an instantaneous blackout detection means. This momentary power failure detection circuit 88 detects the momentary power failure of the AC power supply 43,
The detection signal is sent to the port 67 of the microcomputer 67.
It is configured to give to c.

The microcomputer 67 is constructed to receive the detection signals from the lid switch 32, the water level sensor 40 and the vibration sensor 42. The vibration sensor 42 includes a piezoelectric element 42a and an amplifier circuit 42b. Further, the microcomputer 67
Is configured to receive a detection signal from a sensor that detects the magnitude of the motor current of the motor 25 or a rotation sensor (not shown) that detects the number of rotations of the motor 25. It is possible to detect the weight of the laundry put in.

On the other hand, the normally closed push switch 7 described above
5 and the specific configuration of the normally open push switch 81 will be described. The push switches 75 and 81 are push switches having the same mechanical structure.
This push switch will be described with reference to FIGS. 6 and 7. First, in FIG. 6, the push switch 89
In the case 90, a movable contact support plate 91 made of a conductive material is disposed so as to be swingably deformable in the vertical direction with the left end portion as a fulcrum. The movable contact support plate 91 is urged by a movable spring 92 so as to swing and deform upward (see FIG. 6). The movable contact support plate 91 is configured so as to be oscillated and deformed downward when the operator 93 is pushed in. Movable contacts 94, 94 are provided on the upper and lower surfaces of the right end of the movable contact support plate 91. Further, in the case 90, two fixed contacts 95 and 96 are provided so as to come into contact with and separate from the movable contacts 94 and 94 of the movable contact support plate 91. Furthermore, the lower surface of the case 90 has three
Individual terminals 97, 98, and 99 are provided in a protruding manner. Among them, the terminal 97 is electrically connected to the movable contact support plate 91, the terminal 98 is electrically connected to the fixed contact 95, and the terminal 99 is electrically connected to the fixed contact 96. There is.

In this case, the push switch 89 is shown in an electric circuit as shown in FIG. 7. The common contact C shown in FIG. 7 corresponds to the terminal 97, and the normally open contact A corresponds to the terminal 98. The normally closed contact B corresponds to the terminal 99. That is,
The push switch 89 is the normally closed push switch 7
When used as 5, use terminals 97 and 99,
When used as the normally open push switch 81, the terminals 97 and 98 may be used.

As shown in FIG. 2, at the right end of the operation panel 41 of the fully automatic washing machine, the normally-closed push switch 75 and the normally-open push switch 81 having the above-described structure are provided.
Are arranged side by side as an “off” switch key 100 for turning off the power and an “on” switch key 101 for turning on the power. In this case, the operators 93 of the normally closed push switch 75 and the normally open push switch 81 are covered with a waterproof plate or waterproof sheet that can be pushed. The portions of the waterproof plate or the waterproof sheet corresponding to the respective operators 93 are the “off” switch key 100 and the “on” switch key 101.
The operation panel 41 includes various operation switches for setting washing conditions and the like (course, operating time, etc.), and
Various indicators are provided to display the set washing conditions, the stroke during operation, and the like. Then, switch signals from the various operation switches are given to the microcomputer 67. Further, various display devices are configured to be driven and controlled by the microcomputer 67.

Next, the operation of the above configuration will be described. First,
The operation when the power is turned on will be described. in this case,
A normally open push switch 81 for the operator to turn on the power.
When the "ON" switch key 101 is pressed to turn it on, the port 67a of the microcomputer 67 goes high, and the microcomputer 67 recognizes that the normally open push switch 81 has been turned on.
The control signal is given to the LSI 66 and the port 6 of the LSI 66 is supplied.
6e and 66f are set to low level. Along with this, the thyristor 77 is turned on by turning on the normally open push switch 81.
Since a gate current flows through the thyristor 77, the thyristor 77 is turned on. When the thyristor 77 is turned on, the base current of the second transistor 73 is turned on and flows,
The second transistor 73 is turned on. Then, when the second transistor 73 is turned on, the base current of the first transistor 69 is turned on and flows,
The first transistor 69 is turned on.

As a result, the relay coil 51b is energized and driven, so that the relay switch 51a is turned on and the power is turned on. Even if the operator stops the ON operation of the normally open push switch 81 (even if the normally open push switch 81 returns to OFF), the thyristor 77 continues to be turned on, so that the relay switch 51a is in the ON state,
That is, the power-on state is maintained.

Next, the operation when the power is turned off will be described. In this case, when the operator pushes the normally-closed push switch 75 (“OFF” switch key 100) for turning off the power to turn it off while the power is turned on as described above, the thyristor 77 is cut off. As a result, the base current of the second transistor 73 is turned off, and the second transistor 73 is turned off.
Then, by turning off the second transistor 73, the base current of the first transistor 69 is turned off, and the first transistor 69 is turned off. As a result, the relay coil 51b is cut off, so that the relay switch 51a is turned off and the power is turned off.

In this case, even if the operator stops the pushing operation of the normally closed push switch 75 (even if the normally closed push switch 75 is turned back on), the thyristor 77 is not supplied with the gate current. The off state is retained. Therefore, the off state of the relay switch 51a, that is, the off state of the power source is maintained.

Further, as described above, the relay switch 51
When a is turned off and the power is turned off, the level of the voltage signal output from the signal output terminal of the voltage signal generation means 56 (intermediate connection point A between the detection resistors 52 and 53) is Vcc (+5).
V), which is detected by the microcomputer 67. By this detection, the microcomputer 67 turns off the relay switch 51a (power source),
That is, normally closed push switch 75 (“off” switch)
It is possible to recognize that the pushing operation has been performed.

Specifically, the microcomputer 67
Detects the level of the voltage signal output from the signal output terminal of the voltage signal generating means 56 by sending a scan signal every 16 ms, for example, and the detection result is usually 4
In other words, when the voltage is + 5V continuously, in other words, the level of the voltage signal is 16 ms × 4 = 64 m which is the set time.
Relay switch 51a when + 5V during s
It is configured to determine that the (power source) is in the off state. In this case, the microcomputer 67 constitutes a power supply state judging means. Here, the microcomputer 67 sets the level of the voltage signal output from the signal output terminal of the voltage signal generator 56 to 16 ms during the dehydration operation.
When the detection result detected by sending the scan signal every time is + 5V for seven consecutive times, the relay switch 5
It is configured to determine that 1a (power supply) is in the off state. That is, during the dehydration operation, when the level of the voltage signal is +5 V for 16 ms × 7 = 112 ms, it is configured to determine that the relay switch 51a (power supply) is in the off state, and the power off determination is made. The setting time for use is set to be long.

When the microcomputer 67 recognizes that the relay switch 51a has been turned off, that is, the normally closed push switch 75 ("off" switch) has been pushed, it gives a control signal to the LSI 66, and the LSI 66
The ports 66e and 66f of 66 are configured to be at a high level. With this control, the thyristor 7
7 and the first transistor 69 are cut off (turned off).

Here, the microcomputer 67 goes out of control for some reason and the ports 66e and 6 of the LSI 66 are
Even if 6f may be kept at a low level, as described above, the normally closed push switch 75
If the (off) switch is pushed in, the thyristor 77 and the first transistor 69 are surely turned off (off).
Therefore, the relay switch 51a can be turned off.

By the way, during the dehydration operation, the rotary tub 23 and the outer tub 22 may vibrate greatly, and this vibration may vibrate the main body of the washing machine (outer box 21) greatly. In such a case, the relay switch 51a of the relay 51 may be turned off for a short time due to the vibration generated in the main body of the washing machine. At this time, the microcomputer 6
When detecting that the relay switch 51a is off based on the voltage signal from the voltage signal generating means 56, there is a risk of erroneously determining that the power supply (relay switch 51a) has been turned off.

On the other hand, in the above embodiment, the microcomputer 67 is configured to set the set time for power-off judgment longer than usual during the dehydration operation, specifically, from the voltage signal generating means 56. The relay switch 51a (power supply) is determined to be in the OFF state when the detection result obtained by sending the scan signal every 16 ms and detecting the level of the output voltage signal is +5 V for seven consecutive times. Since it is configured, it is possible to reliably prevent erroneous determination of the off state of the relay 51 due to vibration during the dehydration operation.

Further, in the case of the above-mentioned structure, once the thyristor 77 and the first transistor 69 are turned off (OFF) and the relay switch 51a is turned off, the normally open push switch 81 (“ON” switch) is turned on. ) Is configured so that the power cannot be turned on unless you push it in. Therefore, for example, when a momentary power failure occurs, the thyristor 77 and the first transistor 69 are cut off (turned off), and the relay switch 32a is turned off, even if the power is immediately restored, the microcomputer 67 uses the relay switch 32a. Since the configuration in which the power supply 51a (power supply) cannot be turned on again, there is a risk that the configuration will not be very convenient for the user.

On the other hand, in the above embodiment, the constant voltage circuit 61 for generating the DC voltage for driving the thyristor 77 is provided with the capacitor 65 as a countermeasure against the instantaneous power failure, and the AC power source 4 is used.
3 is provided with an instantaneous blackout detection circuit 88 for detecting the instantaneous blackout, and the microcomputer 67 sets the control signal to L when the instantaneous blackout detection circuit 88 detects the instantaneous blackout of the power supply.
The signal is sent to SI66 to bring the port 66e of the LSI 66 to a high level to stop the supply of the driving DC voltage to the first transistor 69, and the control signal is sent to the LSI 66 to keep the port 66f of the LSI 66 at a low level.
The thyristor 77 is configured to continue to supply the driving DC voltage. As a result, the first transistor 69
Since the supply of the driving DC voltage to the relay switch 51a is stopped, the first transistor 69 is turned off and the relay switch 51a is turned off. At this time, the charge of the capacitor of the constant voltage circuit 61 keeps the thyristor 77 turned on, and the base current of the first transistor 69 keeps turned on.

After this, the power is immediately restored to detect the instantaneous blackout detection circuit 88.
When power recovery is detected by the microcomputer 67
Sends a control signal to the LSI 66 to bring the port 66e of the LSI 66 to a low level and restarts the supply of the driving DC voltage to the first transistor 69. With this restart,
The thyristor 77 continues to be turned on and the first transistor 6
Since the base current of 9 continues to be turned on, the first transistor 69 is turned on and the relay switch 51a
Is turned on again. As a result, even if an instantaneous power failure occurs, when the power is restored, the power supply (relay switch 51a) can be automatically turned on, which improves the usability for the user.

Further, in the above structure, the normally closed push switch 75 for turning off the power may be momentarily turned off by some external force such as shock or vibration. In such a case, if the thyristor 77 is turned off by the momentary off operation of the normally closed push switch 75, the relay switch 51a (power supply) is turned off by turning off the thyristor 77.
Is turned off, and the relay switch 51a cannot be turned on unless the normally-open push switch 81 for turning on the power is turned on, which again causes a problem of poor usability.

On the other hand, in this embodiment, since the capacitor 78 is connected in parallel to the thyristor 77, even if the normally-closed push switch 75 for turning off the power may momentarily turn off, the capacitor Since the current continues to flow in the thyristor 77 due to the charge accumulated in 78, the relay switch 51a can be held in the ON state,
It is possible to prevent the relay switch 51a from being turned off against the intention of the user, and the usability is improved accordingly.
In the case of the above embodiment, the capacity of the capacitor 77 is such that the current flowing through the thyristor 77 (thyristor holding current) can be held when the normally closed push switch 75 is turned off for about 0.2 to 0.3 seconds. It has become a capacity. Therefore, the user (operator) can use the normally closed push switch 75.
Since the time for turning off the switch is about 0.5 seconds, when the user turns off the normally closed push switch 75 with the intention of turning off the power, the thyristor 77 and thus the relay switch 51a are surely turned off. be able to.

In the above embodiment, the microcomputer 67 is configured to set the power-off determination set time longer than usual during the dehydration operation to prevent erroneous power-off determination. Instead of this, it may be configured to prevent an erroneous determination of power-off based on the vibration of the outer tub 22 (the washing machine main body) detected by the vibration sensor 42. Specifically, in the microcomputer 67, the voltage level of the voltage signal from the voltage signal generating means 56 is + 5V.
When the voltage level corresponding to the off state of the relay continues for a set time (when the detection result detected by sending the scan signal every 16 ms for the voltage signal level is +5 V consecutively) ), When vibration is detected by the vibration sensor 42, the determination of power-off is canceled.

Also in the case of this configuration, it is possible to reliably prevent erroneous determination of power-off when the relay switch 51a is turned off due to vibration of the washing machine body due to dehydration operation or the like. In particular, in the above configuration, the vibration sensor 42 directly detects the vibration of the washing machine main body (outer tub unit 2). Therefore, not only the vibration during the dehydration operation but also the artificial external force or impact force is caused. Relay switch 51a due to vibration
It is possible to reliably prevent an erroneous determination that the power is turned off when is turned off. In the above configuration, the vibration sensor 42
Although the power-off judgment is canceled when the vibration is detected by the above, the power-off judgment may be canceled instead when the vibration sensor 42 detects a vibration having a magnitude larger than a preset level. good. The set level may be a large abnormal vibration such as so-called unbalanced vibration or a vibration smaller than this abnormal vibration, and a preferable level value may be appropriately set by experiments or the like.

In the case of the above configuration, the microcomputer 67 detects the vibration by the vibration sensor 42,
Although the configuration for canceling the power-off determination is cancelled, the configuration is not limited to this, and the configuration may be such that when vibration is detected by the vibration sensor 42, the set time for power-off determination is set longer. In this case, specifically, when the microcomputer 67 sends a scan signal every 16 ms to detect the voltage level of the voltage signal from the voltage signal generating means 56, the detected result is +5 V four times in a row. When the vibration is detected by the vibration sensor 42, it is determined that the power is off when the detection result becomes + 5V for seven consecutive times. Also in this configuration, it is possible to reliably prevent an erroneous determination of power-off by the microcomputer 67.

In each of the above-mentioned configurations, the determination of power-off is canceled based on the detection signal from the vibration sensor 42 which detects the vibration of the outer tub 22, or the set time for power-off determination is set long. However, the present invention is not limited to this, and for example, the lid switch 3 as an unbalanced detection switch for detecting abnormal vibration of the outer tub 22.
It is also possible to cancel the power-off determination based on the detection signal from No. 2 or to set a long set time for power-off determination. Even with this configuration, it is possible to reliably prevent an erroneous determination of power-off by the microcomputer 67. Particularly, in the case of the above configuration, since the parts can be shared, it is possible to reduce the manufacturing cost.

In the above embodiment, the constant voltage circuit 61 is provided with the capacitor 65 as a countermeasure against instantaneous blackout, and the AC power supply 4 is used.
Although the instantaneous blackout detection circuit 88 for detecting the instantaneous blackout of No. 3 is provided, the above configuration is not necessarily provided and may be omitted if the countermeasure against the instantaneous blackout is unnecessary. Also,
The capacitor 78 connected in parallel with the thyristor 77 is not an absolutely necessary configuration, but a normally closed push switch 75.
The capacitor 78 may be omitted if the thyristor 77 may be turned off by the momentary off operation. Furthermore, although the thyristor 77 is used in the above embodiment, a triac may be used instead. Furthermore, in the above embodiment, the present invention is applied to a fully automatic washing machine, but the present invention is not limited to this and may be applied to a two-tub washing machine.

[0059]

As is apparent from the above description, the present invention includes a relay provided on the power supply line of the load and a first transistor for switching the relay,
A second transistor for controlling on / off of the first transistor, and a series circuit for controlling on / off of the second transistor, the series circuit including a normally-closed push switch for powering off and a thyristor, and A normally-on push switch for turning on the thyristor is provided, and when the on-switch signal is received from the normally-open push switch for turning on the power, the driving DC voltage is supplied to the first transistor and the thyristor, respectively. A voltage signal generating means for generating a voltage signal having a voltage level according to the on / off state of the relay, and the voltage level of the voltage signal output from the voltage signal generating means corresponds to the off state of the relay. A power status judgment hand that judges that the power has been turned off when the level continues for the set time. Since the power state determination means is configured to set the set time for power off determination long during the dehydration operation, even if the control means runs out of control, the push switch for power off is pushed in. By doing so, it is possible to reliably turn off the power supply by disconnecting power from the thyristor, and moreover, it is possible to reliably prevent erroneous determination of the off state of the relay (power supply) by the power supply state determination means. Play.

Further, in the case of the above construction, the vibration detecting means for detecting the vibration of the washing machine body is provided, and the power source state judging means is
If the vibration level is detected by the vibration detection means when the voltage level of the voltage signal from the voltage signal generation means remains at the voltage level corresponding to the OFF state of the relay and continues for the set time, the determination of power-off is canceled. Even with this configuration, it is possible to reliably prevent erroneous determination of the OFF state of the relay due to vibration during the dehydration operation. Further, in the case of this configuration, the power supply state determination means causes the vibration detection means to generate a vibration when the voltage level of the voltage signal from the voltage signal generation means continues for the set time with the voltage level corresponding to the OFF state of the relay. Even if the power-off determination set time is set to be long while the detection is being performed, it is possible to reliably prevent erroneous determination. Further, if the vibration detecting means is composed of an unbalanced detection switch for detecting abnormal vibration of the tank, the parts can be shared, so that the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is a top view of the operation panel.

[Fig. 3] Vertical side view of the fully automatic washing machine

[Fig. 4] Side view of the area around the lid switch

FIG. 5 is a view corresponding to FIG. 4 showing a state in which a lid is opened.

FIG. 6 is a vertical sectional side view of the push switch.

FIG. 7 is an electric circuit diagram of a push switch.

FIG. 8 is an electric circuit diagram showing a conventional configuration.

[Explanation of symbols]

21 is an outer box, 22 is an outer tank, 23 is a rotary tank, 25 is a motor (load), 27 is a motor type drain valve (load), 30 is a lid,
32 is a lid switch (anbara detection switch), 39 is an electromagnetic water supply valve (load), 40 is a water level sensor, 41 is an operation panel, 42 is a vibration sensor (vibration detection means), 51 is a relay, 51a is a relay switch, and 51b is Relay coil,
56 is a voltage signal generating means, 61 is a constant voltage circuit (DC voltage circuit), 66 is an LSI, 67 is a microcomputer (control means, power supply state determining means), 69 is a first transistor, 73 is a second transistor, 75 is a normally closed push switch, 77 is a thyristor, 78 is a capacitor,
Reference numeral 81 is a normally open push switch, 88 is an instantaneous blackout detection circuit (instantaneous blackout detection means), and 89 is a push switch.

Claims (4)

[Claims] 1. A relay provided in a power supply line of a load, a first transistor for switching the relay, a second transistor for ON / OFF controlling the first transistor, and an ON / OFF control for the second transistor. And a series circuit composed of a normally closed push switch and a thyristor for turning off the power, a normally open push switch for turning on the thyristor, and a normally open push switch for turning on the power. Control means for supplying a driving DC voltage to the first transistor and the thyristor, respectively, and a voltage signal generation circuit for generating a voltage signal of a voltage level according to the ON / OFF state of the relay Means and the voltage level of the voltage signal output from the voltage signal generating means is Power source state determining means for determining that the power source is turned off when the voltage level corresponding to the off state continues for a set time period, the power source state determining means is the set time period for power off determination during a dehydration operation. Power switch circuit of the washing machine, characterized by setting long. 2. A relay provided in a power supply line of a load, a first transistor for switching the relay, a second transistor for controlling on / off of the first transistor, and an on / off control for the second transistor. And a series circuit composed of a normally closed push switch and a thyristor for turning off the power, a normally open push switch for turning on the thyristor, and a normally open push switch for turning on the power. Control means for supplying a driving DC voltage to the first transistor and the thyristor, respectively, and a voltage signal generation circuit for generating a voltage signal of a voltage level according to the ON / OFF state of the relay Means and the voltage level of the voltage signal output from the voltage signal generating means is Power supply state determination means for determining that the power supply is turned off when the voltage level corresponding to the off state of the washing machine continues for a set time, and vibration detection means for detecting the vibration of the washing machine body. When the vibration is being detected by the vibration detecting unit when the voltage level of the voltage signal from the voltage signal generating unit is maintained at the voltage level corresponding to the OFF state of the relay for a set time, the power is turned off. A power switch circuit for a washing machine, which is characterized by canceling a judgment. 3. A relay provided on a power supply line of a load, a first transistor for switching the relay, a second transistor for controlling ON / OFF of the first transistor, and an ON / OFF control for the second transistor. And a series circuit composed of a normally closed push switch and a thyristor for turning off the power, a normally open push switch for turning on the thyristor, and a normally open push switch for turning on the power. Control means for supplying a driving DC voltage to the first transistor and the thyristor, respectively, and a voltage signal generation circuit for generating a voltage signal of a voltage level according to the ON / OFF state of the relay Means and the voltage level of the voltage signal output from the voltage signal generating means is Power supply state determination means for determining that the power supply is turned off when the voltage level corresponding to the off state of the washing machine continues for a set time, and vibration detection means for detecting the vibration of the washing machine body. When the vibration is detected by the vibration detecting means when the voltage level of the voltage signal from the voltage signal generating means is maintained at the voltage level corresponding to the OFF state of the relay for a set time, it is determined that the power is off. A power switch circuit for a washing machine, wherein the set time for use is set longer. 4. The power switch circuit for a washing machine according to claim 2, wherein the vibration detecting means includes an unbalanced detection switch for detecting abnormal vibration of the tub.