JP7412233B2 - Motor control circuit and power window device - Google Patents

Description

The present invention relates to a motor control circuit and a power window device.

2. Description of the Related Art A technique is known in which the rotation of a motor is controlled according to the difference (level relationship) between the potential of a first terminal of the motor and the potential of a second terminal of the motor. In this technology, the motor is rotated in the normal direction by making the potential of one of the first terminal and the second terminal higher than the potential of the other terminal, and the potential of one of the first terminal and the second terminal is made lower than the potential of the other terminal. This will reverse the motor.

Further, when the motor is used to control opening and closing of a window of a power window device, it is preferable to lock the motor so that the window does not open due to external pressure when control of rotation of the motor is stopped. Locking of the motor is achieved by making the potential of the first terminal and the potential of the second terminal the same.

As a technique for locking a motor, there is a technique disclosed in Patent Document 1. The DC motor control circuit disclosed in Patent Document 1 locks the DC motor by shorting both terminals of the DC motor by switching a relay.

Japanese Patent Application Publication No. 2001-78491

Relays have a limited lifespan and are prone to deterioration. Therefore, in the DC motor control circuit disclosed in Patent Document 1, a problem arises in that there is a possibility that the locking of the DC motor may be malfunctioning due to the deterioration of the relay.

An object of one aspect of the present invention is to reduce the possibility that a problem will occur in locking a motor.

A motor control circuit according to aspect 1 of the present invention includes a control circuit that performs rotation control to control rotation of the motor according to a difference between a potential of a first terminal of the motor and a potential of a second terminal of the motor. When the circuit and the rotation control are in a stopped state, a signal of a predetermined potential is generated, and the generated signal is supplied to at least one of the first terminal and the second terminal, thereby increasing the potential of the first terminal. and a motor lock circuit that makes the potential of the second terminal the same, the control circuit includes a control driver that generates a signal to start the rotation control, and the motor lock circuit includes a control driver that generates a signal to start the rotation control. The control driver is stopped in a state where the potential of the first terminal and the potential of the second terminal are the same.

According to the above configuration, the motor can be locked without using a relay, so it is possible to reduce the possibility that a problem will occur in the motor lock.

Further, according to the above configuration, the control driver is stopped when the motor is locked. By making the power consumption of the circuit that generates the signal that starts driving the motor lock circuit (drive trigger circuit) smaller than the power consumption of the control driver, it is possible to reduce the power consumption of the motor control circuit when the motor is locked. Become.

In the motor control circuit according to aspect 2 of the present invention, in the rotation control, the control circuit sets one of the potential of the first terminal and the potential of the second terminal to a first potential, and also sets the potential of the first terminal to a first potential. The other of the potential and the potential of the second terminal is a second potential lower than the first potential, and the predetermined potential is the first potential.

According to the above configuration, the motor can be locked by setting the potential of the first terminal and the potential of the second terminal to the first potential.

In the motor control circuit according to aspect 3 of the present invention, the motor lock circuit has a first transistor, a second transistor, a third transistor, and a fourth transistor, and the first end of the first transistor is The second end of the first transistor is connected to a drive trigger circuit that generates a signal to start driving the motor lock circuit, and the second end of the first transistor is connected to a power source on a second potential side. A third end is connected to the first end of the second transistor, a second end of the second transistor is connected to a power source on the first potential side, and a third end of the second transistor is connected to the first end of the second transistor. A first end of the third transistor and a first end of the fourth transistor are connected, a second end of the third transistor is connected to the power source on the first potential side, and the third transistor A third end of the fourth transistor is connected to the first terminal, a second end of the fourth transistor is connected to the power supply on the first potential side, and a third end of the fourth transistor is connected to the first terminal. It is connected to the second terminal.

According to the above configuration, it is possible to realize a motor lock circuit in which the predetermined potential is the first potential.

In the motor control circuit according to aspect 4 of the present invention, the third transistor controls the potential of the first terminal in the rotation control, and the fourth transistor controls the potential of the second terminal in the rotation control. control.

According to the above configuration, the third transistor and the fourth transistor can be used for both rotation control and motor locking, so the total number of transistors can be reduced.

In the motor control circuit according to aspect 5 of the present invention, in the rotation control, the control circuit sets one of the potential of the first terminal and the potential of the second terminal to a first potential, and also sets the potential of the first terminal to a first potential. The other of the potential and the potential of the second terminal is a second potential lower than the first potential, and the predetermined potential is the second potential.

According to the above configuration, the motor can be locked by setting the potential of the first terminal and the potential of the second terminal to the second potential.

In the motor control circuit according to aspect 6 of the present invention, the motor lock circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor, and the motor lock circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor. One end of the first transistor is connected to a drive trigger circuit that generates a signal to start driving the motor lock circuit, and a second end of the first transistor is connected to a power source on a second potential side. A third end of one transistor is connected to a first end of the second transistor, a second end of the second transistor is connected to the power supply on the second potential side, and the second end of the second transistor is connected to the power supply on the second potential side. A third end is connected to a first end of the third transistor, a second end of the third transistor is connected to a power source having a higher potential than the second potential, and a second end of the third transistor is connected to a power source having a higher potential than the second potential. The third end is connected to the first end of the fourth transistor and the first end of the fifth transistor, and the second end of the fourth transistor is connected to the power source on the second potential side. , a third end of the fourth transistor is connected to the first terminal, a second end of the fifth transistor is connected to the power supply on the second potential side, and a third end of the fifth transistor is connected to the first terminal. The third end is connected to the second terminal.

According to the above configuration, it is possible to realize a motor lock circuit in which the predetermined potential is the second potential.

In the motor control circuit according to aspect 7 of the present invention, the fourth transistor controls the potential of the first terminal in the rotation control, and the fifth transistor controls the potential of the second terminal in the rotation control. control.

According to the above configuration, the fourth transistor and the fifth transistor can be used for both rotation control and motor locking, so the total number of transistors can be reduced.

A power window device according to an eighth aspect of the present invention includes the motor control circuit and an opening/closing control section that controls opening and closing of a window by a motor that is controlled by the motor control circuit.

According to the above configuration, the same effect as the motor control circuit can be obtained in the power window device.

According to one aspect of the present invention, it is possible to reduce the possibility that a problem will occur in locking the motor.

1 is a diagram showing a schematic configuration of a motor control circuit according to Embodiment 1 of the present invention. FIG. 3 is a diagram showing a schematic configuration of a motor control circuit according to Embodiment 2 of the present invention. FIG. 3 is a diagram showing a schematic configuration of a motor control circuit according to Embodiment 3 of the present invention. FIG. 7 is a diagram showing a schematic configuration of a motor control circuit according to Embodiment 4 of the present invention. It is a block diagram showing a schematic structure of a power window device concerning Embodiment 5 of the present invention.

[Foreword]
H-bridge circuits are widely known as circuits for driving motors, and motor control using H-bridge circuits is performed in many situations, including control in automobiles. In an H-bridge circuit for driving a motor using semiconductors, a drive signal is input to four semiconductor switching elements to switch each semiconductor switching element between conduction and non-conduction and control forward and reverse rotation of the motor. ing. When the system is in a sleep state, the four semiconductor switching elements are often in a state in which no drive signals are input (non-conducting). In this state, both ends of the motor are open. Like a generator, a motor is powered by applying force.

Motor control using an H-bridge circuit is also used for power window control of automobiles, and the opening and closing of the window is controlled by rotating the motor in the forward and reverse directions. However, in the sleep state (both ends of the motor are open), if the window is forcibly pushed down by hand, the motor may rotate and the window may open.

In order to avoid this, there is a method to perform brake control using a relay element, but in each of the following embodiments, the H-bridge circuit mainly uses only electronic elements such as semiconductor switching elements. By doing so, it is possible to maintain braking force while suppressing an increase in dark current even in the sleep state.

Note that when brake control is performed using a relay element, mechanical relays have a limited lifespan and are inferior to semiconductor elements such as semiconductor switching elements in terms of reliability. The following can also be said about the case where brake control during sleep is mainly performed using only electronic elements. In order to drive the semiconductor switching elements forming the H-bridge circuit, a driver is required to drive the semiconductor switching elements. In order to start the driver in the sleep state, it is necessary to also start the CPU (Central Processing Unit), which increases standby current.

In each of the following embodiments, it can be interpreted that the H-bridge circuit is proposed to include a circuit that does not leave both ends of the motor in an open state during sleep, but puts both ends of the motor in the same potential state. This puts the motor in a braked state, making it possible to prevent the window from being forced down by hand. In addition, the circuits proposed in the following embodiments are mainly constructed using only electronic elements, and although there is a standby current due to the current flowing through the resistor, it is necessary to drive the CPU and/or driver. The current flowing is small compared to the required current.

[Embodiment]
Embodiments for carrying out the present invention will be described below. Note that for convenience of explanation, members having the same functions as the members described previously are denoted by the same reference numerals, and the description thereof may not be repeated.

In the following description, any member called a "transistor" may be a bipolar transistor or a MOSFET (Metal Oxide Semiconductor Field-Effect Transistor). This transistor has first to third ends, each defined as follows.

First end: A generic name for the base of a bipolar transistor and the gate of a MOSFET. Second end: A generic name for an emitter of a bipolar transistor and a source for a MOSFET. Third end: A general term for a collector of a bipolar transistor and a drain of a MOSFET.

[Embodiment 1]
FIG. 1 is a diagram showing a schematic configuration of a motor control circuit 101 according to Embodiment 1 of the present invention. The motor control circuit 101 controls the motor 51. The motor control circuit 101 includes a control circuit 1 , a motor lock circuit 2 , a CPU 3 , a high-level power supply (power supply on the first potential side) 4 , and a low-level power supply (power supply on the second potential side) 5 .

The motor 51 has a first terminal T1 and a second terminal T2. The rotation of the motor 51 can be controlled according to the difference between the potential of the first terminal T1 and the potential of the second terminal T2. To give a specific example, when the potential of the first terminal T1 is higher than the potential of the second terminal T2, the motor 51 rotates normally, and when the potential of the first terminal T1 is lower than the potential of the second terminal T2, the motor 51 rotates. Reverse.

The control circuit 1 controls each of the potential of the first terminal T1 and the potential of the second terminal T2. That is, the control circuit 1 controls the rotation of the motor 51 according to the difference between the potential of the first terminal T1 and the potential of the second terminal T2. Hereinafter, controlling the rotation of the motor 51 by the control circuit 1 will also be referred to as rotation control.

The motor lock circuit 2 generates a signal of a predetermined potential when rotation control is stopped, and supplies the generated signal to the first terminal T1 and the second terminal T2. Thereby, the motor lock circuit 2 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same.

It is not essential that the motor lock circuit 2 supplies the generated signal to both the first terminal T1 and the second terminal T2. When the rotation control is stopped, if it is possible to make the potential of the first terminal T1 and the potential of the second terminal T2 the same, the motor lock circuit 2 transfers the generated signal to the first terminal T1 and the second terminal T2. It may be configured to supply only one of T2.

According to the above configuration, it is possible to realize locking of the motor 51 without using a relay, so it is possible to reduce the possibility that a problem will occur in locking the motor 51.

The CPU 3 has a drive trigger circuit 6 and a control trigger circuit 7. The drive trigger circuit 6 controls the start and stop of driving the motor lock circuit 2, and generates a signal to start driving the motor lock circuit 2. The control trigger circuit 7 controls the driving of a control driver 8 (described later).

The potential of the high level power supply 4 is a first potential (for example, 12V), and the potential of the low level power supply 5 is a second potential (for example, 0V: so-called GND potential). The second potential is lower than the first potential.

The control circuit 1 includes a control driver 8 and semiconductor switching elements Q1 to Q4. Each of the semiconductor switching elements Q1 to Q4 is composed of a transistor. FIG. 1 shows an example in which each of the semiconductor switching elements Q1 to Q4 is an n-channel MOSFET.

The control driver 8 generates a signal for starting rotation control in accordance with the control by the control trigger circuit 7. Control driver 8 is connected to a first end of semiconductor switching element Q1, a first end of semiconductor switching element Q2, a first end of semiconductor switching element Q3, and a first end of semiconductor switching element Q4.

The second end of the semiconductor switching element Q1 is connected to the third end of the semiconductor switching element Q3. The second end of the semiconductor switching element Q2 is connected to the third end of the semiconductor switching element Q4. A third end of the semiconductor switching element Q1 and a third end of the semiconductor switching element Q2 are connected to the high level power supply 4. A second end of the semiconductor switching element Q3 and a second end of the semiconductor switching element Q4 are connected to the low level power supply 5.

The first terminal T1 is connected to a node between the second end of the semiconductor switching element Q1 and the third end of the semiconductor switching element Q3. The second terminal T2 is connected to a node between the second end of the semiconductor switching element Q2 and the third end of the semiconductor switching element Q4.

Control driver 8 makes semiconductor switching element Q1 and semiconductor switching element Q4 conductive (on), and makes semiconductor switching element Q2 and semiconductor switching element Q3 non-conductive (off). As a result, the potential of the first terminal T1 is set to the first potential, and the potential of the second terminal T2 is set to the second potential, so that the motor 51 rotates normally.

Control driver 8 makes semiconductor switching element Q2 and semiconductor switching element Q3 conductive, and makes semiconductor switching element Q1 and semiconductor switching element Q4 non-conductive. As a result, the potential of the first terminal T1 is set to the second potential, and the potential of the second terminal T2 is set to the first potential, so that the motor 51 rotates in reverse.

The motor lock circuit 2 includes a first transistor TR1, a second transistor TR2, a third transistor TR3, and a fourth transistor TR4. For the sake of brevity, each resistor will not be mentioned. FIG. 1 shows an example in which the first transistor TR1 is an NPN type bipolar transistor, and the second transistor TR2 is a PNP type bipolar transistor. Further, FIG. 1 shows an example in which each of the third transistor TR3 and the fourth transistor TR4 is a p-channel MOSFET.

A first end of the first transistor TR1 is connected to the drive trigger circuit 6. A second end of the first transistor TR1 is connected to the low level power supply 5. A third end of the first transistor TR1 is connected to a first end of the second transistor TR2.

A second end of the second transistor TR2 is connected to the high level power supply 4. A third end of the second transistor TR2 is connected to the low level power supply 5, and a first end of the third transistor TR3 and a first end of the fourth transistor TR4.

A second end of the third transistor TR3 is connected to the high level power supply 4. A third end of the third transistor TR3 is connected to the first terminal T1.

A second end of the fourth transistor TR4 is connected to the high level power supply 4. A third end of the fourth transistor TR4 is connected to the second terminal T2.

During rotation control, the drive trigger circuit 6 makes the first transistor TR1 conductive. As a result, the second transistor TR2 becomes conductive. As a result, the third transistor TR3 and the fourth transistor TR4 become non-conductive. As a result, the motor lock circuit 2 does not substantially affect the rotation control by the control circuit 1.

When the rotation control is stopped, the drive trigger circuit 6 makes the first transistor TR1 non-conductive. As a result, the second transistor TR2 becomes non-conductive. As a result, the third transistor TR3 and the fourth transistor TR4 become conductive. As a result, the potential of the first terminal T1 and the potential of the second terminal T2 are made the same. Therefore, the motor lock circuit 2 can realize locking of the motor 51.

It can be said that the output of the motor lock circuit 2 is a signal generated by the motor lock circuit 2. The potential of this signal, ie, the predetermined potential, is preferably a first potential. According to the above configuration, the motor 51 can be locked by setting the potential of the first terminal T1 and the potential of the second terminal T2 to the first potential. According to the configuration of the motor lock circuit 2 described above, it is possible to realize the motor lock circuit 2 in which the predetermined potential is the first potential.

In a state where the motor lock circuit 2 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same, the control driver 8 is stopped in order to reduce current consumption. According to the above configuration, the control driver 8 is stopped when the motor 51 is locked. By making the power consumption of the drive trigger circuit 6 smaller than the power consumption of the control driver 8, it is possible to reduce the power consumption of the motor control circuit 101 when the motor 51 is locked.

Further, in a state where the motor lock circuit 2 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same, the first transistor TR1 is non-conductive, so the drive trigger circuit 6 can be stopped. . Further, in this state, since the control driver 8 can be stopped, the control trigger circuit 7 can also be stopped. That is, in this state, both the drive trigger circuit 6 and the control trigger circuit 7 can be stopped, so the CPU 3 can be stopped. By stopping the CPU 3, the current flowing through the motor control circuit 101 when the motor 51 is locked can be dramatically reduced.

In the motor control circuit 101 shown in FIG. 1, the third end of the third transistor TR3 and the third end of the fourth transistor TR4 are connected to the first terminal T1 and the second terminal T2, respectively. However, the connection destinations of the third end of the third transistor TR3 and the third end of the fourth transistor TR4 are not limited to this. That is, the third end of the third transistor TR3 and the third end of the fourth transistor TR4 may be connected to the first end of the semiconductor switching element Q1 and the first end of the semiconductor switching element Q2, respectively.

[Embodiment 2]
FIG. 2 is a diagram showing a schematic configuration of a motor control circuit 102 according to Embodiment 2 of the present invention. The motor control circuit 102 differs from the motor control circuit 101 (see FIG. 1) in the following points. For the sake of brevity, each resistor will not be mentioned.

The motor control circuit 102 does not include the third transistor TR3 and the fourth transistor TR4 of the motor control circuit 101. On the other hand, in the motor control circuit 102, the semiconductor switching element Q1 and the semiconductor switching element Q2 have the same functions as the third transistor TR3 and the fourth transistor TR4 of the motor control circuit 101, respectively. A diode D1 is added between the second transistor TR2 and the semiconductor switching elements Q1 and Q2.

In other words, the semiconductor switching element Q1 as the third transistor controls the potential of the first terminal T1 in rotation control. Similarly, the semiconductor switching element Q2 as the fourth transistor controls the potential of the second terminal T2 in rotation control. According to the above configuration, the third transistor and the fourth transistor can be used for both rotation control and locking of the motor 51, so the total number of transistors can be reduced.

[Embodiment 3]
FIG. 3 is a diagram showing a schematic configuration of a motor control circuit 103 according to Embodiment 3 of the present invention. Motor control circuit 103 differs from motor control circuit 101 (see FIG. 1) in the following points. For the sake of brevity, each resistor will not be mentioned.

The motor control circuit 103 includes a motor lock circuit 9 instead of the motor lock circuit 2 of the motor control circuit 101.

The motor lock circuit 9 generates a signal of a predetermined potential when rotation control is stopped, and supplies the generated signal to the first terminal T1 and the second terminal T2. Thereby, the motor lock circuit 9 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same.

It is not essential that the motor lock circuit 9 supplies the generated signal to both the first terminal T1 and the second terminal T2. When the rotation control is stopped, if it is possible to make the potential of the first terminal T1 and the potential of the second terminal T2 the same, the motor lock circuit 9 transfers the generated signal to the first terminal T1 and the second terminal T2. It may be configured to supply only one of T2.

According to the above configuration, it is possible to realize locking of the motor 51 without using a relay, so it is possible to reduce the possibility that a problem will occur in locking the motor 51.

The drive trigger circuit 6 controls the start and stop of driving the motor lock circuit 9, and generates a signal to start driving the motor lock circuit 9.

The motor lock circuit 9 includes a first transistor TR11, a second transistor TR12, a third transistor TR13, a fourth transistor TR14, and a fifth transistor TR15. FIG. 3 shows an example in which each of the first transistor TR11 and the second transistor TR12 is an NPN type bipolar transistor, and the third transistor TR13 is a PNP type bipolar transistor. Further, FIG. 3 shows an example in which each of the fourth transistor TR14 and the fifth transistor TR15 is a p-channel MOSFET.

A first end of the first transistor TR11 is connected to the drive trigger circuit 6. A second end of the first transistor TR11 is connected to the low level power supply 5. A third end of the first transistor TR11 is connected to a first end of the second transistor TR12.

A second end of the second transistor TR12 is connected to the low level power supply 5. A third end of the second transistor TR12 is connected to a first end of the third transistor TR13.

The second end of the third transistor TR13 is connected to the power supply 10, which has a higher potential than the potential (second potential) of the low-level power supply 5. A third end of the third transistor TR13 is connected to a first end of the fourth transistor TR14 and a first end of the fifth transistor TR15.

A second end of the fourth transistor TR14 is connected to the low level power supply 5. A third end of the fourth transistor TR14 is connected to the first terminal T1.

A second end of the fifth transistor TR15 is connected to the low level power supply 5. A third end of the fifth transistor TR15 is connected to the second terminal T2.

A diode D11 is provided between the third transistor TR13 and the power supply 10. A diode D12 is provided between the third transistor TR13 and the fourth transistor TR14. A diode D13 is provided between the third transistor TR13 and the fifth transistor TR15.

During rotation control, the drive trigger circuit 6 makes the first transistor TR11 conductive. As a result, the second transistor TR12 and the third transistor TR13 become non-conductive. As a result, the fourth transistor TR14 and the fifth transistor TR15 become non-conductive. As a result, the motor lock circuit 9 does not substantially affect the rotation control by the control circuit 1.

When the rotation control is stopped, the drive trigger circuit 6 makes the first transistor TR11 non-conductive. As a result, the second transistor TR12 and the third transistor TR13 become conductive. As a result, the fourth transistor TR14 and the fifth transistor TR15 become conductive. As a result, the potential of the first terminal T1 and the potential of the second terminal T2 are made the same. Therefore, the motor lock circuit 9 can realize locking of the motor 51.

It can be said that the output of the motor lock circuit 9 is a signal generated by the motor lock circuit 9. The potential of this signal, ie, the predetermined potential, is preferably a second potential. According to the above configuration, the motor 51 can be locked by setting the potential of the first terminal T1 and the potential of the second terminal T2 to the second potential. According to the configuration of the motor lock circuit 9 described above, it is possible to realize the motor lock circuit 9 in which the predetermined potential is the second potential.

In a state where the motor lock circuit 9 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same, the control driver 8 is stopped in order to reduce current consumption. According to the above configuration, the control driver 8 is stopped when the motor 51 is locked. By making the power consumption of the drive trigger circuit 6 smaller than the power consumption of the control driver 8, it is possible to reduce the power consumption of the motor control circuit 103 when the motor 51 is locked.

Further, in a state where the motor lock circuit 9 makes the potential of the first terminal T1 and the potential of the second terminal T2 the same, the first transistor TR11 is non-conductive, so the drive trigger circuit 6 can be stopped. . Further, in this state, since the control driver 8 can be stopped, the control trigger circuit 7 can also be stopped. That is, in this state, both the drive trigger circuit 6 and the control trigger circuit 7 can be stopped, so the CPU 3 can be stopped. By stopping the CPU 3, the current flowing through the motor control circuit 103 when the motor 51 is locked can be dramatically reduced.

[Embodiment 4]
FIG. 4 is a diagram showing a schematic configuration of a motor control circuit 104 according to Embodiment 4 of the present invention. Motor control circuit 104 differs from motor control circuit 103 (see FIG. 3) in the following points. For the sake of brevity, each resistor will not be mentioned.

The motor control circuit 104 does not include the fourth transistor TR14 and the fifth transistor TR15 of the motor control circuit 103. On the other hand, in the motor control circuit 104, the semiconductor switching element Q3 and the semiconductor switching element Q4 have the same functions as the fourth transistor TR14 and the fifth transistor TR15 of the motor control circuit 103, respectively.

In other words, the semiconductor switching element Q3 as the fourth transistor controls the potential of the first terminal T1 in rotation control. Similarly, the semiconductor switching element Q4 as the fifth transistor controls the potential of the second terminal T2 in rotation control. According to the above configuration, the fourth transistor and the fifth transistor can be used for both rotation control and locking of the motor 51, so the total number of transistors can be reduced.

The third end of the third transistor TR13 is connected to the first end of the semiconductor switching element Q1 and the first end of the semiconductor switching element Q2 instead of the first end of the semiconductor switching element Q3 and the first end of the semiconductor switching element Q4. You may. This allows the predetermined potential to be the first potential, similar to the second embodiment described above.

[Embodiment 5]
FIG. 5 is a block diagram showing a schematic configuration of a power window device 301 according to Embodiment 5 of the present invention.

The power window device 301 includes a motor control circuit 201 and an opening/closing control section 202. The motor control circuit 201 is one of the motor control circuits 101 to 104 described above. The motor 251 is controlled by the motor control circuit 201 . The opening/closing control unit 202 is configured by hardware and/or software, and is a well-known member that controls opening/closing of the window 252 by the motor 251.

According to the above configuration, the same effects as the motor control circuit 201 can be obtained in the power window device 301.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

1 Control circuit 2, 9 Motor lock circuit 3 CPU
4 High level power supply (first potential side power supply)
5 Low level power supply (second potential side power supply)
6 Drive trigger circuit 7 Control trigger circuit 8 Control driver 10 Power supply (power supply with a higher potential than the second potential)
51, 251 Motors 101 to 104, 201 Motor control circuit 202 Opening/closing control unit 252 Window 301 Power window device D1, D11 to D13 Diodes Q1 to Q4 Semiconductor switching element T1 First terminal T2 Second terminal TR1, TR11 First transistor TR2, TR12 Second transistor TR3, TR13 Third transistor TR4, TR14 Fourth transistor TR15 Fifth transistor

Claims (5)

a control circuit that performs rotation control to control the rotation of the motor according to a difference between a potential of a first terminal of the motor and a potential of a second terminal of the motor;
In the stopped state of the rotation control, a signal of a predetermined potential is generated, and the generated signal is supplied to at least one of the first terminal and the second terminal, thereby changing the potential of the first terminal and the second terminal. Equipped with a motor lock circuit that makes the potential of the two terminals the same,
The control circuit has a control driver that generates a signal to start the rotation control,
In a state in which the motor lock circuit makes the potential of the first terminal and the potential of the second terminal the same, the control driver is stopped;
In the rotation control, the control circuit sets one of the potential of the first terminal and the potential of the second terminal to the first potential, and sets the other of the potential of the first terminal and the potential of the second terminal to the potential of the second terminal. a second potential lower than the first potential;
The predetermined potential is the first potential,
The motor lock circuit has a first transistor, a second transistor, a third transistor, and a fourth transistor,
A first end of the first transistor is connected to a drive trigger circuit that generates a signal to start driving the motor lock circuit, and a second end of the first transistor is connected to a power source at a second potential side. a third end of the first transistor is connected to a first end of the second transistor,
A second end of the second transistor is connected to a power source on a first potential side, and a third end of the second transistor is connected to a first end of the third transistor and a first end of the fourth transistor. connected,
A second end of the third transistor is connected to the power source on the first potential side, and a third end of the third transistor is connected to the first terminal,
A second end of the fourth transistor is connected to a power source on the first potential side, and a third end of the fourth transistor is connected to the second terminal . control circuit. The third transistor controls the potential of the first terminal in the rotation control,
The motor control circuit according to claim 1 , wherein the fourth transistor controls the potential of the second terminal in the rotation control. a control circuit that performs rotation control to control the rotation of the motor according to a difference between a potential of a first terminal of the motor and a potential of a second terminal of the motor;
In the stopped state of the rotation control, a signal of a predetermined potential is generated and the generated signal is supplied to at least one of the first terminal and the second terminal, thereby changing the potential of the first terminal and the second terminal. Equipped with a motor lock circuit that makes the potential of the two terminals the same ,
The control circuit has a control driver that generates a signal to start the rotation control,
In a state in which the motor lock circuit makes the potential of the first terminal and the potential of the second terminal the same, the control driver is stopped;
In the rotation control, the control circuit sets one of the potential of the first terminal and the potential of the second terminal to the first potential, and sets the other of the potential of the first terminal and the potential of the second terminal to the potential of the second terminal. a second potential lower than the first potential;
The predetermined potential is the second potential,
The motor lock circuit has a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor,
A first end of the first transistor is connected to a drive trigger circuit that generates a signal to start driving the motor lock circuit, and a second end of the first transistor is connected to a power source at a second potential side. a third end of the first transistor is connected to a first end of the second transistor,
A second end of the second transistor is connected to the power supply on the second potential side, a third end of the second transistor is connected to a first end of the third transistor,
The second end of the third transistor is connected to a power source having a potential higher than the second potential, and the third end of the third transistor is connected to the first end of the fourth transistor and the fifth transistor. connected to the first end,
A second end of the fourth transistor is connected to the power supply on the second potential side, and a third end of the fourth transistor is connected to the first terminal,
A second end of the fifth transistor is connected to the power supply on the second potential side, and a third end of the fifth transistor is connected to the second terminal . control circuit. The fourth transistor controls the potential of the first terminal in the rotation control,
The motor control circuit according to claim 3 , wherein the fifth transistor controls the potential of the second terminal in the rotation control. A motor control circuit according to any one of claims 1 to 4 ,
A power window device comprising: an opening/closing control section that controls opening and closing of a window by a motor that is controlled by the motor control circuit.

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