JPH0647564U - Power window switch control circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the delay timer from fluctuating due to fluctuations in the window movement time, and also prevents the window from moving without permission if the protection circuit returns within the auto timer setting time. . [Structure] When the auto down switch 14 is operated in the ON direction, the manual down switch 13 is turned on to be in a manual operation state, after which the auto down switch 14 is turned on, and the capacitor 99 is instantly charged. As a result, the transistor 93 is turned on, the output of the comparator 91 becomes the “H” level, and the transistor 83 self-holds the conductive state. For self-holding, when the motor 34 locks and the output of the comparator 111 becomes the “L” level, or when the lock current is below a predetermined level, V
ref 3 rises and exceeds Vc1 ', or motor 3
No current flows through 4, and the output of the comparator 111 is "L".
Continue until reaching the level.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power window switch control circuit that opens and closes a window of a vehicle by a driving force of a motor and detects a lock state of the motor and a disconnection of the motor to control energization of the motor.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a power window switch control circuit is known which opens and closes a window of a vehicle by a driving force of a motor and detects a locked state of the motor and a disconnection of the motor to control energization to the motor.

FIG. 3 is a circuit diagram showing a conventional power window switch control circuit described in, for example, Japanese Patent Application Laid-Open No. 2-58686.

The power window switch control circuit has a terminal R _a connected to the terminals T1 and P1 and _a terminal R _b connected to the terminal P2, and the terminals R _c , R _d , and R _e are The terminals T2 and P3 are commonly connected, and the terminal R _f is connected to the terminal P4. The terminal R _h is connected to the terminal P6 and one end of the resistor 31, the other end of the resistor 31 is connected to the terminals T4 and P7, and the terminal R _g is connected to the terminals T3 and P5.

On the other hand, the relay device 30 is composed of two exciting coils 32a and 33a and relay switches 32b and 33b which are turned on and off by these exciting coils 32a and 33a. and 33a each terminal R _c, R _b and between terminals R _d, are connected between the R _f. Further, the relay switch 32b及beauty 33b, together are individually connected to the common contact c is the terminal R _a and R _g, the normally open contact a is connected in common to the terminal R _e, and each normally closed contact b is commonly connected to the terminal R _h .

The terminals T1 and T3 are connected to the input terminals of the DC motor 34 for driving the window regulator. When the motor 34 is energized in the positive direction, a window glass (not shown) rises and closes in the closing direction. When moved and energized in the opposite direction, the window glass (not shown) descends and moves in the opening direction. Moreover, the terminal T2 is connected to the power supply terminal 35, and the terminal T4 is connected to the ground terminal.

The control circuit device 36 is configured to include a manual up switch 11, an automatic up switch 12, a manual down switch 13 and an automatic down switch 14, and the manual up switch 11 is connected between terminals P2 and P7. The manual down switch 13 is connected between the terminals P4 and P7. As a result, when the manual up switch 11 is turned on, the exciting coil 32a of the relay device 30 is energized and the contact point (ca) of the relay 32b is turned on. As it is formed, the window glass is raised accordingly.

Further, when the manual down switch 13 is turned on, the contact point (ca) of the relay switch 33b is turned on according to the energization of the exciting coil 33a, so that the reverse energizing path of the motor 34 is turned on. Is formed and the window glass is lowered. Then, the terminal P1 is connected to the power supply terminal 35 during the period when the contacts (ca) of the relay switch 32b are turned on, and the period during which the contacts (ca) of the relay switch 33b is turned on. Means that the terminal P5 is connected to the power supply terminal 35.

The terminals P1 and P5 are connected to a bus bar 39 via a diode OR circuit 37 and a resistor 38, and the bus bar 39 is connected to a terminal P7 via a constant voltage diode 40 having the illustrated polarity. Therefore, a constant voltage is applied between the bus bar 39 and the terminal P7 with either the manual up switch 11 or the manual down switch 13 turned on. Since the current is supplied to the motor 34 through the resistor 31 as described above, a detection voltage V _d having a voltage level corresponding to the load current flowing in the motor 34 appears at both ends of the resistor 31. V _d is applied between terminals P6 and P7.

The auto-up switch 12 has one end connected to the bus 39, and a resistor 41 and a series circuit of a first capacitor 42 as a timer element between the other end and the terminal P7. A series circuit of the diode 43 and the manual down switch 13 of the illustrated polarity, and a series circuit of the diode 44 and the resistor 45 of the illustrated polarity are respectively connected. One end of the auto-down switch 14 is connected to the bus 39, and between the other end and the terminal P7, a resistor 46 and a series circuit of a second capacitor 47, which is a timer element, and a diode of the polarity shown. A series circuit of the 48 and the manual up switch 11, and a series circuit of the diode 49 and the resistor 45 having the illustrated polarities are connected to each other. In this case, the capacities of the first capacitor 42 and the second capacitor 47 are set equal, and the charging time constant of the first capacitor 42 via the resistor 41 and the second capacitor via the resistor 46 are set. The charging time constant of 47 is set equal (for example, about 0.01 second), and the discharging time constant of the first capacitor 42 via the resistors 41 and 45 and the second discharging time constant via the resistors 46 and 45. Is set to be equal to the discharging time constant of the capacitor 47 (for example, about 10 seconds).

Further, a resistor 51 and a trimming resistor 52 are connected in series between the bus bar 39 and the terminal P7 to form a first reference resistor generating circuit 50, and a common connection point between the resistor 51 and the trimming resistor 52 is formed. Generates a reference voltage V _s1 . Reference numeral 53 is a first comparison circuit that constitutes an auto stop circuit 54 together with the resistor 31 and the first reference resistance generation circuit 50, and is provided so as to be supplied from between the bus bar 39 and the terminal P7. The first comparison circuit 53 is connected so as to compare the reference voltage V _s1 with the detection voltage V _d from the terminal P6, and when V _s1 > V _d, a high level signal (potential of the bus bar 39). (Corresponding to the potential of the terminal P7) when V _s1 ≤V _d . The output terminal of the first comparison circuit 53 is connected to the terminal P7 via the resistor 55 and the resistor 45. The resistance ratio of the resistor 55 and the resistor 45 is set to about 1/10.

Reference numeral 56 denotes a second reference voltage generating circuit, which is formed by connecting resistors 57 and 58 in series between the bus 39 and the terminal P7, and generates a reference voltage V _s2 from the common connection point between them. Reference _numeral 59 denotes a second comparison circuit, which is connected to compare the reference voltage V _s2 and the _divided voltage V _t from the common connection point Q of the resistors 55 and 45, and V _s2 <V _t At the time of, a high level signal (corresponding to the potential of the bus bar 39) is output, and at V _s2 ≧ V _t, a low level signal (corresponding to the potential of the terminal P7) is output. The output terminal of the second comparison circuit 59 is connected to the terminal P7 via a constant voltage diode 60 having the illustrated polarity, and is also connected to the bus bar 39 via a resistor 61.

Reference numeral 62 denotes an npn-type transistor as a switching element that is turned on by the output of the second comparison circuit 59, and has a collector and an emitter connected to terminals P2 and P5, respectively, and a diode whose base has the polarity shown in the drawing. It is connected to the output terminal of the second comparison circuit 59 via 63. A constant voltage diode 64 having the illustrated polarity is connected between the collector and the emitter of the transistor 62, and a resistor 65 is connected between the base and the emitter. Reference numeral 66 denotes an npn-type transistor as a switching element that is turned on by the output of the second comparison circuit 59. The collector and emitter are connected to terminals P4 and P1, respectively, and the base is a diode 67 having the polarity shown in the figure. It is connected to the output terminal of the second comparison circuit 59 via. A constant voltage diode 68 of the illustrated polarity is connected between the collector and the emitter of the transistor 66, and a resistor 69 is connected between the base and the emitter.

Then, the first capacitor 42, the second capacitor 47, the resistors 41, 45, 46, the second reference voltage generation circuit 56, the second comparison circuit 59, the transistors 62, 66, the diode 44, The holding circuit 70 is composed of 49, 63, 67 and the like.

Reference numeral 71 denotes a current control resistor, and a series circuit of this and the light emitting diode 22 is connected between the terminals P3 and P7. Therefore, when the ignition switch (not shown) is turned on, the light emitting diode 22 is energized and lit, and the operation knob is illuminated.

Next, the operation will be described.

When the auto up switch 12 is turned on, the manual up switch 11 is already turned on at this point, so that the excitation coil 32a is energized by turning on the contact (ca) of the relay switch 32b, and the motor 34 is driven. It is driven and the window glass starts to rise accordingly. Then, when the auto-up switch 12 is turned on, the first capacitor 42 is instantly charged through the resistor 41, and accordingly, the divided voltage V _t from the common connection point Q of the resistors 55 and 45 is changed to the second reference voltage. It becomes larger than the reference voltage V _s2 from the generation circuit 56.

Therefore, the output of the second comparison circuit 59 is inverted into a high level signal, and the high level signal is given to the bases of the transistors 62 and 66 through the diode 63 or 67, respectively. At this time, the emitter potential of one transistor 62 is relatively low between the terminal P5 and the contact (c-b) of the relay switch 33b via the resistor 31, but the emitter potential of the other transistor 66 is. , The terminal P1 and the contact (ca) of the relay switch 32b are at the potential level of the power supply terminal 35, so that only the transistor 62 is turned on and the transistor 66 is not turned on. Such an ON state of the transistor 62 is divided until the output of the second comparison circuit 59 is inverted to a low level signal, that is, as the charge stored in the first capacitor 42 is discharged through the resistor 45. It is held for the time T until the _piezo voltage V _t becomes the reference voltage V _s2 or less.

As described above, when the transistor 62 is turned on, the energization path of the relay coil 32a includes the collector and the emitter of the transistor 62, the terminal P5, the contact (c-b) of the relay switch 33b, and the resistor 31. Therefore, even if the automatic up switch 12 and the manual up switch 11 are turned off thereafter, the forward direction electric circuit of the motor 34 is continuously formed, whereby the window is formed. The glass will be raised automatically.

As described above, when the window glass is automatically raised and reaches the maximum ascending position (window closing position), the motor 34 is locked and a relatively large lock current flows. Accordingly, the voltage drop across the resistor 31 increases accordingly. When the detected voltage V _d given to the terminal P6 becomes larger than the reference voltage V _s1 from the first reference voltage generation circuit 50 in accordance with such an increase in the voltage drop, the output of the first comparison circuit 53 becomes low level. The signal is inverted (potential level of the terminal P7). Then, the charge charged in the first capacitor 42 is discharged through the resistor 41, the diode 44, and the resistor 55, and accordingly, the divided voltage V _t from the connection point Q is the reference voltage from the second reference voltage generating circuit 56. It becomes lower than the voltage V _s2 . As a result, the output of the second comparison circuit 59 is inverted to a low level signal and the transistor 62 is turned off, so that the excitation of the exciting coil 32a is stopped and the relay switch 32b is turned on between the contacts (c-b). Then, the motor 34 is released from the forward-direction energization path formation state, and the window glass is stopped at the maximum rising position.

However, when the lock current flows through the motor 34, the lock current may decrease due to the increase in the winding temperature, and thus the motor 34 operates in the auto mode as described above. When driven, the detection voltage V _d may not exceed the reference voltage V _s1 forever, in which case an abnormal situation occurs in which the motor 34 is continually energized. To do. When such a situation occurs, the winding of the motor 34 may abnormally generate heat, possibly damaging the winding. Therefore, when the time T set in the discharge circuit including the first capacitors 42 and 45, which is the timer element of the holding circuit 70, elapses after the turn-up switch 12 is turned off, the resistors 55 and 45 are commonly connected. Since the divided voltage V _t from the point Q becomes lower than the reference voltage V _s2 from the second reference voltage generation circuit 56, the output of the second comparison circuit 59 is inverted to the low level signal, and as a result, the transistor 62. Is turned off, the exciting coil 32a is cut off and the relay switch 32b returns to the on state between the contacts (c-b), whereby the motor 34 is cut off.

That is, when a predetermined time T elapses after the motor 34 is started to be driven in the automatic mode, the motor 34 is automatically cut off, thereby preventing the above-mentioned abnormal condition.

[0023]

[Problems to be solved by the device]

 The conventional power window switch control circuit has an auto timer (set to more than the window open / close time, approx. 10 seconds) and a delay timer (set from lock to complete closing of the window, approx. Since 0.7 seconds) is configured by using the same capacitors 42 and 47, there is a problem that the time of the delay timer varies due to the variation of the window moving time.

Further, in a motor having a protection device (bimetal, etc.) incorporated therein, if the protection circuit operates during auto operation, the holding circuit continues to operate and the protection circuit returns within the auto timer set time. , There was a problem that the window started to move freely.

The present invention has been made in order to solve the above problems, and prevents the delay timer time from changing due to the change in the window moving time without complicating the circuit. Another object of the present invention is to provide a power window switch control circuit that can prevent the window from moving without permission when the protection circuit recovers within the auto timer set time.

[0026]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention includes a motor that drives a window of a vehicle, and a control unit that detects a lock state of the motor and controls a current to the motor. In a power window switch control circuit that controls the delay time, a delay timer circuit that limits the time until the power supply to the motor is cut off after the motor is locked to a time preset by a resistor and a first capacitor. An auto timer circuit for setting the energization time to the motor with a resistor and a second capacitor; a first comparing means for discharging the first capacitor when a lock current of the motor is detected; A second comparator that turns off a relay that supplies a current to the motor when the discharge of the first capacitor is detected. It is a window switch control circuit.

[0027]

[Action]

 Based on the above-mentioned configuration, the power window switch control circuit according to the present invention is configured by a delay timer circuit configured by a resistor and a first capacitor to interrupt energization after a predetermined delay time after the motor is locked, and a plurality of second capacitors. The motor is energized by the automatic timer circuit up to a preset time, and when the motor lock current is detected, the first comparator discharges the first capacitor and the second comparator discharges the first capacitor. The relay that supplies current to the motor is turned off by discharging the capacitor of.

[0028]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a power window switch control circuit according to the present invention.

The power window switch control circuit has a DC power supply 71, and the a terminal of the relay switch 32b and the b terminal of the relay switch 33b are connected to the positive side of the DC power supply 71. To the minus side (ground) of 71, the b terminal of the relay switch 32b and the a terminal of the relay switch 33b are connected via a current detecting resistor 72. Further, a motor 34 is connected to the c terminal of the relay switch 32b and the c terminal of the relay switch 33b. Further, the positive side of the DC power supply 71 is connected to the exciting coils 32a and 33a via a diode 73 for preventing backflow, and the exciting coils 32a and 33a are connected in parallel with the coil 74 for absorbing the coil electromotive force. , 75 are connected.

A manual up switch 11, a manual down switch 13, a constant voltage supply circuit 77 and resistors 78, 79 and 80 are connected in parallel to the diode 73 via a resistor 76, and the manual up switch 11 Is connected via a resistor 82 to the base of a relay coil exciting transistor 81 whose collector is connected to the exciting coil 32a and whose emitter is connected to the ground. In the manual down switch 13, the collector is connected to the exciting coil 33a. Moreover, the emitter is connected via a resistor 84 to the base of a relay coil exciting transistor 83 whose ground is connected.

Further, the resistor 78 is connected to the resistor 85 and the negative input of the descending comparator 86 as the second comparator for self-holding the exciting coil 32 a for exciting the transistor 81. The voltage divided by the resistors 78 and 85 and the resistor 87 connected to the resistor 85 is applied to the negative input of the comparator 86. Further, a transistor 88 is connected in parallel to the resistor 87, and the emitter of the transistor 88 is connected to the ground via a level-up diode 89.

The resistor 79 is connected to the resistor 90 and the negative input of the rising comparator 91 as the second comparator for holding the transistor 83 for exciting the exciting coil 33a by itself. The voltage divided by the resistors 79 and 90 and the resistor 92 connected to the resistor 90 is applied to the negative input of the comparator 91. Further, a transistor 93 is connected in parallel to the resistor 92, and the emitter of the transistor 93 is connected to the ground via the level-up diode 94.

Further, an auto up switch 12 and an auto down switch 14 are connected in parallel to the resistor 80, and the auto up switch 12 has a resistor 95 and a second capacitor which is a constituent element of the auto timer. The capacitor 96 and the circuit sneak prevention diode 97 are connected in parallel, and the base of the transistor 88 is connected to the resistor 95. A resistor 98, a capacitor 99, which is a component of the auto timer, and a circuit sneak prevention diode 100 are connected in parallel to the auto-down switch 14, and the base of the transistor 93 is connected to the resistor 98. There is.

On the other hand, the constant voltage supply circuit 77 is composed of resistors 101, 102, 103, 104 and 105 and a zener diode 106, and the positive input of the comparator 107 is connected to the resistors 102 and 104. The negative input of the comparator 107 is connected to the high potential side of the resistor 72 for current detection. The comparator 107 is connected with a capacitor 110 as a first capacitor that constitutes a delay timer via a charging resistor 108 and a circuit sneak prevention diode 109. The comparator 107 as the "first comparing means" compares the voltage generated from the current detecting resistor 72 with the reference voltage from the constant voltage supply circuit 77 and outputs "L" when the motor is locked. Is set to be Further, the negative input of the comparator 111 is connected to the connection point of the resistors 103 and 105, and the high potential side of the resistor 72 for current detection is connected to the positive input of the comparator 111. The comparator 110 is connected to the capacitor 110 forming a delay timer via the resistor 112 and the circuit sneak prevention diode 113, and the circuit shunt prevention diodes 97 and 100 are connected.

A resistor 114 is connected to a connection point between the circuit sneak-in prevention diode 109 and the capacitor 110, a resistor 115 is connected between the capacitor 110 and the ground, and the resistors 114 and 115 are connected to each other. Is connected to the positive inputs of the comparators 86 and 91. Further, the comparator 86 is connected to the base of the transistor 81 via the resistor 116, and the comparator 91 is connected to the base of the transistor 83 via the resistor 117.

Next, the operation of this embodiment will be described.

It is assumed that the ignition key is turned on and the power supply is connected to the circuit.

(1) Initial State When nothing is operated, the output of the comparator 11 1 is at the “L” level because the motor 34 is not in the energized state, and Vc 1 ′ is lower than Vref 3, so that the comparator 91 outputs The output is at "L" level. Further, the output of the comparator 111 is at “L” level, and since Vc1 ′ is lower than Vref 3, the output of the comparator 86 is at “L” level.

(2) Manual Up Operation When the operator turns on the manual up switch 11, the transistor 81 is turned on, the exciting coil 32a is excited, the contact 32b of the relay is closed, and the power supplied from the power source 71 is changed. It is supplied to the motor 34, and the driving force of the motor 34 raises the window. At this time, the outputs of the comparators 107 and 111 become the “H” level and the capacitor 110 is charged. However, since the reference voltage is set so that Vc1 ′ becomes Vref 3 or less, the comparator 86 The output remains at "L" level. As a result, the window rise continues only while the manual up switch 11 is being pressed by the operator.

(3) Manual Down Operation When the operator turns on the manual down switch 13, the transistor 83 is turned on, the exciting coil 33a is excited, the contact 33b of the relay is closed, and the power supplied from the power supply 71 is reduced. It is supplied to the motor 34, and the driving force of the motor 34 causes the window to descend. At this time, the outputs of the comparators 107 and 111 become the “H” level and the capacitor 110 is charged, but since the reference voltage is set so that Vc1 ′ becomes Vref 3 or less, the comparator 91 The output remains at "L" level. As a result, the window lowering continues only while the manual down switch 13 is pressed by the operator.

(4) Auto Down Operation However, when the auto down switch 14 is operated, the manual down switch 13 is turned on and then the auto down switch 14 is operated as shown in FIGS. Is turned on.

When the operator operates the auto down switch 14 in the ON direction, first the manual down switch 13 is turned on (see FIG. 2A), the manual operation state is set, and then the auto down switch 14 is turned on. (See FIG. 2B), the capacitor 99 is instantly charged. As a result, the transistor 93 is turned on, and Vref3 becomes Vc1 'or less. Therefore, the output of the comparator 91 becomes the “H” level (see FIG. 2 (k)), and the transistor 83 maintains the conductive state by itself (see FIG. 2 (l)). In this self-holding state, the motor 34 locks and the output of the comparator 111 (see FIG. 2 (g)) becomes the “L” level, or the lock current is below a predetermined level (reference voltage of the comparator 111). In this case, the capacitor 99 is discharged, the transistor 93 is turned off, the Vref 3 rises and exceeds Vc1 ′, or the current stops flowing to the motor 34, and the output of the comparator 111 becomes “L” level. It continues until (see FIG. 2 (g)).

(5) Auto-up operation However, when the auto-up switch 12 is operated, the manual up switch 11 is turned on as shown in FIGS. Is turned on.

When the operator operates the auto-up switch 12 in the ON direction, the manual-up switch 11 is first turned on to be in a manual operation state, and then the auto-up switch 12 is turned on, and the capacitor 96 is instantaneously turned on. Be charged. As a result, the transistor 88 is turned on, and Vref3 becomes Vc1 'or less. Therefore, the output of the comparator 86 becomes "H" level, and the transistor 81 maintains the conductive state by itself. In this self-holding state, when the motor 34 locks and the output of the comparator 107 becomes the "L" level, or when the lock current is below a predetermined level (reference voltage of the comparator 107), the capacitor 96 is discharged. Then, the transistor 88 is turned off and Vref3 rises to exceed Vc1 ', or the current stops flowing to the motor 34, and the output of the comparator 111 continues to become "L" level.

(6) Stop due to manual operation during automatic operation When the switch in the direction opposite to the one currently operating is operated, the contact on the opposite side also operates and the motor 34 becomes short-circuited, and the motor current stops flowing. , The output of the comparator 111 becomes "L" level, and the capacitors 96, 99 and 110 discharge through the resistor 112. As a result, the motor 34 stops and the self-holding is released.

[0047]

[Effect of device]

 As described above, according to the power window switch control circuit of the present invention, since the auto timer and the delay timer are configured by using different capacitors, the delay is caused by the fluctuation of the window moving time without complicating the circuit. It is possible to prevent the timer time from fluctuating, which can prevent the window from moving without permission when the protection circuit is restored within the auto timer setting time.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a power window switch control circuit according to the present invention.

FIG. 2 is a time chart for explaining the operation of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a conventional power window switch control circuit.

[Explanation of symbols]

 11 Manual Up Switch 12 Auto Up Switch 13 Manual Down Switch 14 Auto Down Switch 32a, 33a Excitation Coil 32b, 33b Relay Switch 71 Power Supply 72 Constant Voltage Supply Circuit 81, 83, 88, 93 Transistor 86, 91, 107, 111 Comparator 95,98 Resistance 96,99,110 Capacitor

Claims (1)

[Scope of utility model registration request] 1. A power window switch control circuit including a motor for driving a window of a vehicle, and control means for detecting a locked state of the motor and controlling a current to the motor, the power window switch control circuit controlling opening and closing of the window. In the above, a delay timer circuit that limits the time until the motor is stopped from being energized after the motor is locked to a time preset by a resistor and a first capacitor; And an automatic timer circuit set by the second capacitor, a first comparing means for discharging the first capacitor when the lock current of the motor is detected, and a discharging means for the first capacitor, A second comparator for turning off a relay for supplying a current to the motor; and a power window switch control comprising: Road.