KR20040087371A - Device for driving a door lock of a car - Google Patents

Abstract

PURPOSE: An apparatus for driving a vehicle door lock is provided to reduce the power consumption by preventing generation of dark current. CONSTITUTION: A couple of driving switches(10,20) are used for switching a supply voltage of a battery in order to supply a driving voltage for rotating a motor from the battery. A first transistor(T1) is used for turning on/off the driving switches according to a switching state. A charging circuit(40) is used for charging the supply voltage of the battery and controlling the first transistor according to the charged supply voltage. A switching block(70) is used for supplying a switching control voltage to the driving switches or a charging voltage to the charging circuit.

Description

Car Door Lock Drive {DEVICE FOR DRIVING A DOOR LOCK OF A CAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock driving apparatus of a motor vehicle, and more particularly, to a driving circuit of a motor for driving the door lock to be locked and released according to the operation of the car key.

Typically, a car key used to start a car is used as a key for locking or unlocking a door of a car. When the car key is inserted into the keyhole provided in the door of the vehicle and rotated, the door lock is driven to lock or release the door according to the rotation direction. At this time, when driving a specific door (mainly driver's side door) provided in the vehicle, it is common that all the doors are configured to lock or unlock at the same time. As such, in order for the door lock of any one door to be interlocked with the door locks of the other doors, an interlock device is required so that each door lock is driven uniformly in conjunction with the operation of one door lock.

Conventionally, mechanical devices have been mainly used as such interlocking devices, but recently, many electric devices using a motor are used to easily perform locking and unlocking with a small force. The electric device operates by using a battery provided in a vehicle as a driving power source, and the direction of the voltage supplied from the battery to the motor is changed by inserting and rotating the car key in the keyhole of the car door, thereby controlling the door lock driving motor. I adopt the method that becomes.

1 is a view showing an example of such a conventional electric door lock drive device. Figure 1 shows the related art of the present invention to illustrate the object of the present invention, it does not mean that the door lock drive device of such a configuration is known before the filing date of the present invention.

The door lock driving device shown in FIG. 1 includes a connection terminal unit 30, first and second drive switches 10 and 20, a switching circuit unit 60, a comparator 50, a charging circuit unit 40, and a switching block ( 70).

The connection terminal part 30 is connected to the motor M which drives a door lock. The connection terminal unit 30 has terminals 1, 2, 3, and 4 as shown. Terminals 1 and 2 are terminals for supplying driving power from the battery (indicated by + 12V in the drawing) to the motor M, and terminals 3 and 4 are the voltage supply polarities to the motor M. This is a terminal to control. When a predetermined voltage is supplied to terminal 3, the motor M rotates in the forward direction (the direction in which the door lock locks the door), and when the predetermined voltage is supplied to terminal 4, the motor M is reversed (door lock). In the direction of releasing the locking of the door).

The first drive switch 10 is composed of a relay having a switch S1 and a coil W1. The common contact 11 of the switch S1 is connected to the third terminal of the connection terminal unit 30, and the two selection contacts 12 and 13 of the switch S1 are respectively connected to the ground terminal GND and the battery (+ 12V). ) The switch S1 is connected to the ground contact GND side selection contact 12 as the common contact 11 is always on, and when the current flows through the coil W1, the common contact 11 is connected to the battery (+ 12V). The switching state is varied so as to be connected to the side select contact 13. One end of the coil W1 is connected to the first contact point 71, and the other end of the coil W is connected to the switching circuit unit 60.

The second drive switch 20 also has a configuration substantially the same as that of the first drive switch 10. Compared with the first driving switch 10, the common contact 21 of the switch S2 is connected to the fourth terminal of the connection terminal part 30, and one end of the coil W2 is connected to the third contact 73. The only difference is that they are connected to).

The switching circuit unit 60 is composed of two switching transistors T _S1 and T _S2 . When a positive voltage to the base of the transistor (T _S1) is a transistor (T _S1) it is turned on and also turning on the transistor (T _S2). Accordingly, the current flows to the coils W1 and W2 of the first and second driving switches 10 and 20. When a negative voltage to the base of the transistor (T _S1) is a transistor (T _S1, T _S2) is a turn-off state to the state with no current to flow in the coils (W1, W2).

The charging circuit unit 40 includes a capacitor C2, and the capacitor C2 is connected to the second contact 72. When the voltage is supplied from the battery (+ 12V) to the second contact 72, the capacitor C2 is charged.

The negative input terminal IN− of the comparator 50 is connected to the battery (+ 12V) side, and the positive input terminal IN + is connected to the charging circuit unit 40. The comparator 50 outputs a positive voltage when the voltage input from the charging circuit unit 40 is greater than the voltage input from the battery (+ 12V), and outputs a voltage having a value of "0" when the voltage is smaller than the voltage input from the battery (+ 12V). At this time, when the charging circuit unit 40 is fully charged, the values of the resistors R1, R2, R3, R4, and R5 are increased such that the output voltage of the charging circuit unit 40 is greater than the voltage input from the battery (+ 12V). Is set.

The switching block 70 includes the first to third contacts 71, 72, and 73, the common contact 77, and the selector switch 75. The common contact 77 is connected to a battery (+ 12V), and the first to third contacts 71, 72, and 73 are respectively connected to the first drive switch 10 as described above. , A second contact 72 connected to the charging circuit unit 40 and a third contact 73 connected to the second driving switch 20. The selection switch 75 is configured as a sliding switch, and selectively connects the common contact 77 to the first to third contacts 71, 72, and 73 according to the sliding position. The switching block 70 is disposed near the key hole provided in the door of the vehicle, and the common contact 77 is connected to the first contact 71 and the second by the selection switch 75 as the car key inserted into the key hole is turned. The contact 72 and the third contact 73 are connected sequentially or in reverse order.

The operation of the conventional vehicle door lock drive device having the above configuration is as follows.

In the state where the door of the vehicle is locked, the common contact 77 in the switching block 70 is connected to the first contact 71 by the selection switch 75, and the charging circuit unit 40 is discharged. In this state, when the user inserts the car key into the keyhole of the car door and rotates the car key clockwise, the selection switch 75 in the switching block 70 is momentarily connected to the second contact 72 and then the third key. It is connected to the contact 73.

The voltage is charged in the instant charging circuit section 40 when the selection switch 75 is connected to the second contact point 72. The comparator 50 outputs a positive voltage by the voltage charged in the charging circuit unit 40, and thus the switching circuit unit 60 is turned on. This state persists until the capacitor of the charging circuit unit 40 discharges below a certain voltage even after the selector switch 75 in the switching block 70 is connected to the third contact 73 via the second contact 72. do.

When the selector switch 75 is connected to the third contact 73, the voltage of the battery (+ 12V) is applied to the coil W2 of the second driving switch 20 through the third contact 73, whereby The switch S2 in the two drive switch 20 is connected to the selection contact 23 on the battery (+ 12V) side. Accordingly, the voltage of the battery (+ 12V) is applied to the fourth terminal of the connection terminal unit 30, whereby the motor M is driven in the reverse direction to unlock the door lock.

Thereafter, while the charging circuit unit 40 gradually discharges and falls below a certain voltage while the selection switch 75 in the switching block 70 is connected to the third contact 73, the comparator 50 is " 0 " The voltage having the value of "is outputted. Accordingly, the switching circuit unit 60 is turned off to block the application of the battery (+ 12V) power supply to the coil W2. Therefore, no more battery (+ 12V) power is consumed.

On the other hand, in the state in which the locking of the door of the vehicle is released, the common contact 77 in the switching block 70 is connected to the third contact 73 by the selector switch 75, whereby the third contact ( The voltage of the battery (+ 12V) is applied to the coil W2 of the second driving switch 20 through 73.

In this state, when the user inserts the car key into the keyhole of the car door and rotates the car key counterclockwise, the selector switch 75 in the switching block 70 is momentarily connected to the second contact 72 and then It is connected to one contact 71. Thereby, the motor M is driven to lock the door lock by an operation similar to the above. That is, the charging circuit unit 40 is charged through the second contact 72 so that the comparator 50 outputs a positive voltage, whereby the switching circuit unit 60 is turned on and the first driving switch 10 is driven. Battery (+ 12V) power is supplied to terminal 3 of the connection terminal unit 30. Thus, the motor M is driven in the forward direction so that the door lock is locked.

As long as the selection switch 75 in the switching block 70 is connected to the first contact 71 or the third contact 73, the discharge of the charging circuit part 40 is completed. 60 is turned off to block the application of the battery (+ 12V) power supply to the coils W1 and W2 through the first contact 71 or the third contact 73. Therefore, no more battery (+ 12V) power is consumed.

However, the conventional door lock driving device as described above has a disadvantage in that unnecessary power consumption occurs in the comparator 50 and the circuits around the comparator 50.

That is, a voltage divider composed of resistors R4 and R5 is used to apply a predetermined reference voltage to the negative input terminal IN− of the comparator 50. The dark current of approximately 1 mA flows through the voltage divider at all times. . In addition, since the comparator 50 must be constituted by a circuit such as an OP amplifier, a driving power source is required to drive the comparator 50, and a power source of a battery (+ 12V) must be used as the driving power source. 50) In itself, power consumption always occurs. According to the measurement, the dark current flowing through the drive power input terminal of the comparator 50 reaches approximately 0.5 mA while the comparator 50 is not used.

Therefore, according to the conventional door lock driving apparatus as described above, even when the circuit is not operating, the continuous power consumption occurs in the comparator 50 and its peripheral circuits, and this power is supplied by the battery (+ 12V), so the battery ( 12V) discharge is caused. When the vehicle is not used for a long time, the battery (+ 12V) can be completely discharged even by the consumption of the battery (+ 12V) power caused by the dark current, so that the user may experience great inconvenience.

The present invention has been made to solve the above problems, it is an object of the present invention to provide an automobile door lock driving apparatus that can minimize the power consumption by preventing the generation of dark current.

1 is a circuit diagram of a conventional door lock driving apparatus,

2 is a circuit diagram of a door lock driving apparatus according to the present invention;

3 shows waveforms in each element in the circuit of FIG. 2; and

FIG. 4 is a diagram illustrating waveforms in each device when the second transistor is omitted in FIG. 2.

A door lock driving apparatus for a vehicle according to the present invention for achieving the above object is characterized in that it comprises a pair of drive switches, a first transistor, a charging circuit unit, and a switching block.

The pair of drive switches respectively interrupt the voltage supply from the battery provided in the vehicle with respect to the motor driving the door lock of the vehicle, and the driving voltage for rotating the motor in one direction and the other direction, respectively, when the battery is turned on. It serves to feed from.

The first transistor controls the turn-on / turn-off operation of the pair of drive switches according to a switching state, and a charging circuit unit controls the first transistor by a charged voltage by charging a voltage supplied from the battery.

The switching block performs a switching operation according to the operation of the car key used to drive the door lock, and selects the voltage from the battery as the switching operation control voltage to the pair of drive switches and as the charging voltage in the charging circuit section. To supply.

According to the present invention, there is an advantage that the dark current generated while the door lock driving device is not used is minimized, thereby minimizing battery power consumption.

Preferably, a second transistor is disposed between the charging circuit unit and the first transistor. The second transistor is turned on / off by an output voltage of the charging circuit unit to control the switching state of the first transistor by interrupting an input of the voltage from the battery to the first transistor.

The accuracy of the operation of the door lock driving device is increased by the dual switching structure by the first transistor and the second transistor.

Hereinafter, with reference to the drawings will be described in detail a preferred embodiment of the present invention.

2 is a circuit diagram of a door lock driving apparatus according to the present invention. In Fig. 2, the same reference numerals as those in Fig. 1 are given to the same components as those shown in Fig. 1.

The automobile is provided with a plurality of doors (for example, four doors in the case of a passenger car). Each of these doors is provided with a door lock, which is operated by the motor M to be locked or unlocked. At this time, all the door locks can be simultaneously locked or released by one motor (M) and a mechanical interlocking device that allows all the door locks to be interlocked by the motor (M), and by installing a motor (M) for each door lock By controlling all the motors M together, all door locks may be locked or released simultaneously. Which one of these cases is employed is irrelevant to the gist of the present invention, and any mechanical configuration of the motor M and the interlock is not related to the gist of the present invention, and thus detailed illustration and description thereof will be omitted. .

The door lock driving apparatus according to the present invention includes a connection terminal unit 30, first and second drive switches 10 and 20, first and second transistors T1 and T2, a charging circuit unit 40, and a switching block ( 70).

The connection terminal part 30 is connected to the motor M which drives a door lock. The connection terminal unit 30 has terminals 1, 2, 3, and 4 as shown.

Battery 1 (shown as + 12V in the drawing) is connected to terminal 1, and ground terminal (GND) is connected to terminal 2. That is, terminal 1 and terminal 2 are terminals for supplying driving power to the motor (M). On the battery (+ 12V) side, a diode D1 and a capacitor C1 are provided. The diode D1 and the capacitor C1 function to rectify the current drawn from the battery (+ 12V).

Terminals 3 and 4 are terminals for controlling the supply polarity of the voltage supplied to the connection terminal unit 30 through the terminal 1 and terminal 2 to the motor (M). When a predetermined voltage is supplied to terminal 3, the motor M is supplied with voltage from the battery (+ 12V) to the motor M so that the motor M is rotated in the forward direction (the direction in which the door lock locks the door). When a predetermined voltage is supplied to the motor M, the voltage from the battery + 12V is supplied to the motor M so that the motor M is rotated in the reverse direction (the direction in which the door lock unlocks the door).

The first drive switch 10 is composed of a relay having a switch S1 and a coil W1.

The common contact 11 of the switch S1 is connected to the third terminal of the connection terminal part 30, and the two selection contacts 12 and 13 of the switch S1 are respectively connected to the ground terminal GND and the battery (+ 12V). ) The switch S1 is a state in which the common contact 11 is connected to the ground contact GND side selection contact 12 in a constant state, and when the current flows in the coil W1, the common contact 11 is a battery (+). The switching state is varied so as to be connected to the selection contact 13 on the 12V) side. When the switch S1 is connected to the selection contact 12 of the ground terminal GND, the third terminal of the connection terminal unit 30 is connected to the ground terminal GND, and the switch S1 is connected to the battery (+ 12V). When connected to the side selection contact 13, the third terminal of the connection terminal unit 30 is connected to a battery (+ 12V).

One end of the coil W1 is connected to the first contact point 71, and the other end of the coil W1 is connected to the first transistor T1. As described below, the first contact 71 is connected to the battery (+ 12V) or disconnected from the battery (+ 12V) according to the state of the switching block 70.

The diode D2 is connected in parallel with the coil W1 at both ends of the coil W1. When the current supply to the coil W1 is interrupted, the diode D2 quickly dissipates the current remaining between the coil W1 and the first transistor T1 so that the first drive switch 10 malfunctions. To prevent it.

The second drive switch 20 also has a switch S2 for selectively connecting the common contact 21 to the two selection contacts 22 and 23, a coil W2 for driving the switch, and a diode D3 connected in parallel to the coil. ), Substantially the same configuration as the first drive switch (10). Compared with the first driving switch 10, the common contact 21 of the switch S2 is connected to the fourth terminal of the connection terminal part 30, and one end of the coil W2 is connected to the third contact 73. The only difference is that they are connected to).

The collector of the first transistor T1 is commonly connected to each of the coils W1 and W2, and the emitter is connected to the ground terminal GND. The first transistor T1 functions as a switch to control the connection between the coils W1 and W2 and the ground terminal GND according to a control voltage input to the base.

A chattering prevention diode D5 is connected in parallel to the first transistor T1. Chattering may occur due to a surge current generated when an electrical contact occurs in the first driving switch 10 or the second driving switch 20. The diode D5 stably dissipates the current generated after the first transistor T1 at the time when the supply of current to the first drive switch 10 or the second drive switch 20 is cut off, thereby stably operating the first transistor. This function is to be made.

The collector of the second transistor T2 is connected to a battery (+ 12V), and the emitter is connected to the base of the first transistor T1. Input voltage regulating resistors R10 and R11 to the first transistor T1 are disposed between the first transistor T1 and the second transistor T2.

The charging circuit unit 40 includes a capacitor C2. The capacitor C2 of the charging circuit unit 40 is connected to the second contact 72 to charge and receive the voltage from the battery (+ 12V) according to the state of the switching block 70. The charging circuit section 40 also includes a zener diode D4 connected in parallel with the capacitor C2. Zener diode D4 functions to maintain the voltage supplied from the battery (+ 12V) to be a constant voltage. Voltage distribution circuits formed by resistors R1 and R2 are disposed between the second contact 72 and the charging circuit unit 40, and a first transistor T1 is disposed between the charging circuit unit 40 and the second transistor T2. A resistor R3 is disposed to adjust the magnitude of the voltage input to the input.

The switching block 70 includes the first to third contacts 71, 72, and 73, the common contact 77, and the selector switch 75.

The common contact 77 is connected to a battery (+ 12V). The first to third contacts 71, 72, and 73 may include a first contact 71 connected to the first drive switch 10, a second contact 72 connected to the charging circuit unit 40, and a second drive switch ( Each of the third contacts 73 connected to 20 is electrically identical to each other. That is, the first to third contacts 71, 72, and 73 are the first contact 71 connected to the first drive switch 10 as described above, and the second contact 72 connected to the charging circuit unit 40. , And the third contact 73 connected to the second drive switch 20 itself, or a separate contact connected thereto.

The selection switch 75 is configured as a sliding switch, and selectively connects the common contact to the first to third contacts 71, 72, and 73 according to the sliding position. The switching block 70 is disposed near the key hole provided in the door of the vehicle, and the common contact 77 is connected to the first contact 71 and the second by the selection switch 75 as the car key inserted into the key hole is turned. The contact 72 and the third contact 73 are connected sequentially or in reverse order.

Hereinafter will be described the operation of the door lock driving apparatus of the vehicle according to the present invention having the configuration as described above.

As described above, the switches S1 and S2 in the first and second drive switches 10 and 20 are respectively connected to the ground terminal GND in a normal state, and accordingly, the number 3 of the connection terminal unit 30 is connected. No voltage is applied to terminal and terminal 4.

First, it is assumed that the door of the vehicle is locked. In this case, the common contact 77 in the switching block 70 is connected to the first contact 71 by the selector switch 75, and thus the first drive switch 10 of the first driving switch 10 is connected to the first contact 71. The voltage of the battery (+ 12V) is applied to the coil W1.

The charging circuit unit 40 is in a discharged state. Accordingly, since no voltage is applied to the base of the second transistor T2, the second transistor T2 is turned off. Therefore, since no voltage is applied to the base of the first transistor T1, the first transistor T1 is also turned off, and the connection between the first contact 71 and the ground terminal GND is connected by the first transistor T1. The current is not flowed through the coil W1 of the first driving switch 10 because it is cut off.

In this state, when the user inserts the car key into the keyhole of the car door and rotates the car key clockwise, the selection switch 75 in the switching block 70 is momentarily connected to the second contact 72 and then the third key. It is connected to the contact 73.

At the moment when the selector switch 75 is connected to the second contact 72, the voltage of the battery (+ 12V) is supplied to the charging circuit unit 40 through the second contact 72, whereby the charging circuit unit 40 is provided. The capacitor C2 is charged with the voltage divided by the resistors R1 and R2. The second transistor T2 is turned on by the voltage charged in the charging circuit unit 40, whereby the voltage of the battery (+ 12V) distributed by the resistors R10 and R11 is applied to the base of the first transistor T1. When applied, the first transistor T1 is turned on. This state persists for a predetermined time even after the selector switch 75 in the switching block 70 is connected to the third contact 73 via the second contact 72. That is, such a switching state lasts for a time until the voltage output from the charging circuit unit 40 decreases until the second transistor T2 is turned off by the discharge of the charging circuit unit 40.

When the selector switch 75 is connected to the third contact 73, the voltage of the battery (+ 12V) is applied to the coil W2 of the second driving switch 20 through the third contact 73, whereby The switch S2 in the two drive switch 20 is connected to the selection contact 23 on the battery (+ 12V) side. Accordingly, the voltage of the battery (+ 12V) is applied to the fourth terminal of the connection terminal unit 30, whereby the motor M is driven in the reverse direction to unlock the door lock.

Thereafter, when the discharge of the charging circuit unit 40 is completed while the selection switch 75 in the switching block 70 is connected to the third contact 73, the second transistor T2 is turned off. As a result, the first transistor T1 is turned off to block the application of the battery (+ 12V) power supply to the coil W2 through the third contact 73. As a result, the switch S2 in the second drive switch 20 is connected to the ground contact GND side selection contact 22, so that the power supply from the battery +12 is cut off. Therefore, no more battery (+ 12V) power is consumed.

On the other hand, in the state in which the locking of the door of the vehicle is released, the common contact 77 in the switching block 70 is connected to the third contact 73 by the selector switch 75, whereby the third contact ( A battery (+ 12V) is connected to the coil W2 of the second drive switch 20 through 73.

Since the charging circuit unit 40 is in a discharged state, as described above, the second transistor T2 and the first transistor T1 are turned off so that no current flows in the coil W2 of the second driving switch 20. .

In this state, when the user inserts the car key into the keyhole of the car door and rotates the car key counterclockwise, the selector switch 75 in the switching block 70 is momentarily connected to the second contact 72 and then It is connected to one contact 71.

At the moment when the selection switch 75 is connected to the second contact point 72, the charging circuit unit 40 is charged with the same operation as described above, whereby the second transistor T2 and the first transistor T1 are charged. Is turned on. After the selector switch 75 is connected to the first contact point 71, the voltage of the battery (+ 12V) is applied to the coil W1 of the first driving switch 10 through the first contact point 71. As a result, the voltage of the battery (+ 12V) is applied to the third terminal of the connection terminal unit 30 through the switch S1 in the first driving switch 10. Thus, the motor M is driven in the forward direction so that the door lock is locked.

Thereafter, while the discharge of the charging circuit unit 40 is completed while the selection switch 75 in the switching block 70 is connected to the first contact point 71, the second transistor T2 is operated as described above. And the first transistor T1 is turned off to block the application of the battery (+ 12V) current to the coil W1 through the first contact 71. Therefore, no further battery (+ 12V) power consumption occurs.

As such, when the selection switch 75 in the switching block 70 is connected to the first contact 71 or the third contact 73, the door lock is kept in the locked state or the unlocked state, respectively. The power supply of (+ 12V) is cut off by the first transistor T1 so that battery (+ 12V) power consumption does not occur. Further, when the selector switch 75 in the switching block is moved from the first contact 71 to the third contact 73 or from the third contact 73 to the first contact 71, the selector switch 75 during the movement. As the charging circuit unit 40 is charged as the second contact 72 passes, the second transistor T2 and the first transistor T1 are turned on, and accordingly, the first driving switch 10 or the second driving switch is turned on. 20 is driven to lock or unlock the door lock.

According to the present invention, since the second transistor T2 for switching operation is used instead of the OP amplifier as compared with the prior art of FIG. 1, the dark current in the non-operating state in which the first and second transistors T2 are turned off. There is an advantage that does not occur.

In addition, when the circuit is configured to perform the dual switching operation by the first transistor T1 and the second transistor T2 as in the present invention, the switching operation is more clearly performed. Considering only the operation of the circuit, the dual switching operation by the first transistor T1 and the second transistor T2 will not be necessary. That is, even if the second transistor T2 is omitted and the output of the charging circuit unit 40 is directly input to the base of the first transistor T1, the first circuit while the charging circuit unit 40 is charged above the transistor turn-on voltage is used. Since the transistor T1 will remain turned on, the switching operation by the first transistor T1 will be performed in the same manner as described above.

In this way, the second transistor T2 may be omitted to form a door lock driving circuit according to the present invention. However, when the dual switching structure of the first transistor T1 and the second transistor T2 is configured as shown in FIG. 2, there are additional advantages as follows.

3 and 4 are diagrams for explaining the advantages of the circuit according to the present invention having the configuration of performing the dual switching operation as described above, Figure 3 is provided with both the first transistor (T1) and the second transistor (T2) 4 is a graph in a state in which the second transistor T2 is omitted and only the first transistor T1 is provided. 3 and 4, the top waveform shows output signals of the drive switches 10 and 20, and the center waveform shows input signals input to the base of the first transistor T1. The waveform below shows the output signal of the capacitor C2 in the charging circuit unit 40, respectively.

In FIGS. 3 and 4, as described above, the capacitor C2 is gradually discharged from the moment when the voltage of the battery (+ 12V) is supplied and charged (a time when the voltage of the capacitor C2 is increased stepwise). The first transistor T1 is turned on, and thus the first driving switch 10 or the second driving switch 20 is operated. However, in the example of FIG. 4, the voltage from the charging circuit unit 40 is directly input to the first transistor T1, and the voltage of the charging circuit unit 40 gradually decreases. Therefore, when the output voltage of the charging circuit unit 40 decreases to the vicinity of the minimum voltage required to turn on the first transistor T1 (the time indicated by X in the waveform of the output voltage of the capacitor C2 in FIG. 4), the first The transistor T1 is in a state where the turn on state and the turn off state are not clear. Therefore, accurate control of the turn-off operation of the first and second drive switches 10 and 20 becomes difficult.

However, as shown in FIG. 3, when the charging circuit unit 40 primarily drives the second transistor T2 and the first transistor T1 is driven by the second transistor T2, the charging circuit unit 40 is used. When the output voltage of the transistor is reduced, the output of the second transistor T2 is turned off according to the waveform on the staircase, so that the control voltage input to the first transistor T1 is changed to the staircase waveform, whereby the first transistor Precise control of the state transition time of T1 is enabled.

According to the present invention, since the comparator 50 circuit by the conventional OP amplifier does not exist, the generation of dark current is prevented, thereby reducing the power consumption of the car battery (+ 12V). In addition, since the driving of the driving switches 10 and 20 is superposedly controlled by the two switching transistors T1 and T2, accurate operation control of the driving switches 10 and 20 is possible. In addition, the accuracy of the operation of the driving switches 10 and 20 is increased by the diodes D2 and D3 provided in the driving switches 10 and 20, and the diodes D5 provided in the first transistor T1. This prevents chattering of the current during the switching operation, enabling accurate locking and unlocking control of the door lock.

Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the specific embodiment described above, anyone skilled in the art that various modifications within the claims This will be possible.

Claims (4)

A pair of driving for supplying a voltage from the battery provided in the vehicle to the motor for driving the door lock of the vehicle, and supplying a driving voltage from the battery for turning the motor to rotate in one direction and the other direction, respectively, when turned on. switch; A first transistor for controlling a turn-on / turn-off operation of the pair of drive switches according to a switching state; A charging circuit unit charging a voltage supplied from the battery and controlling the first transistor by the charged voltage; And Switching operation in accordance with the operation of the car key used to drive the door lock, and selectively supplying the voltage from the battery to the pair of drive switches as a voltage for switching operation control and as a voltage for charging to the charging circuit portion; Doorlock driving device of a vehicle comprising a; switching block. The method of claim 1, The switching state of the first transistor is disposed between the charging circuit unit and the first transistor, and is turned on / off by an output voltage of the charging circuit unit to interrupt the input of the voltage from the battery to the first transistor. The door lock driving apparatus of the vehicle further comprising a second transistor for controlling the. The method according to claim 1 or 2, And a diode connected in parallel to at least one of the pair of drive switches and the first transistor. The method according to claim 1 or 2, The charging circuit unit, A capacitor that charges the voltage from the battery, and And a Zener diode for maintaining a constant voltage connected in parallel to the capacitor.