JP2021145461A - Motor control circuit and power window device - Google Patents

Abstract

To reduce the risk of motor lock failure.SOLUTION: A control driver (8) is stopped in a state in which a motor lock circuit (2) makes the potential of a first terminal (T1) and the potential of a second terminal (T2) the same.SELECTED DRAWING: Figure 1

Description

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

A technique for controlling the rotation of a motor according to the difference (high-low relationship) between the potential of the first terminal of the motor and the potential of the second terminal of the motor is known. In this technique, the potential of one of the first terminal and the second terminal is made higher than the potential of the other to rotate the motor in the normal direction, and the potential of one of the first terminal and the second terminal is made lower than the potential of the other. By doing so, the motor is reversed.

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

Examples of the technique for locking the motor include the technique disclosed in Patent Document 1. The DC motor control circuit disclosed in Patent Document 1 locks the DC motor by short-circuiting both terminals of the DC motor by switching relays.

Japanese Unexamined Patent Publication No. 2001-78491

Relays have a limited life and are prone to deterioration. Therefore, in the DC motor control circuit disclosed in Patent Document 1, there is a problem that the lock of the DC motor may have a problem due to the deterioration of the relay.

One aspect of the present invention is to reduce the possibility that a motor lock may malfunction.

The motor control circuit according to the first aspect of the present invention controls rotation to control the rotation of the motor according to the difference between the potential of the first terminal of the motor and the potential of the second terminal of the motor. In the circuit and the rotation control stopped state, a signal having a predetermined potential is generated, and the generated signal is supplied to at least one of the first terminal and the second terminal, whereby the potential of the first terminal is reached. A motor lock circuit having the same potential as that of the second terminal is provided, and the control circuit has a control driver that generates a signal for starting the rotation control, and the motor lock circuit is the motor lock circuit. 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 that it is possible to reduce the possibility that the motor lock will malfunction.

Further, according to the above configuration, the control driver is stopped when the motor is locked. By making the power consumption of the circuit (drive trigger circuit) that generates the signal to start driving the motor lock 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 the second aspect 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 as the first potential and of the first terminal. 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 as the first potential.

In the motor control circuit according to the third aspect of the present invention, the motor lock circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor, and the first end of the first transistor is It 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 supply on the second potential side, and is the first of the first transistor. The third end is connected to the first end of the second transistor, the second end of the second transistor is connected to the power supply on the first potential side, and the third end of the second transistor is. The first end of the third transistor and the first end of the fourth transistor are connected, and the second end of the third transistor is connected to the power supply on the first potential side, and the third transistor is connected. The third end of the fourth transistor is connected to the first terminal, the second end of the fourth transistor is connected to the power supply on the first potential side, and the third end of the fourth transistor is the said. It is connected to the second terminal.

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

In the motor control circuit according to the fourth aspect 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. To control.

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

In the motor control circuit according to the fifth aspect 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 as the first potential and of the first terminal. 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 the sixth aspect 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 first transistor of the first transistor is included. One end 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 the second potential side. The third end of the 1 transistor is connected to the first end of the second transistor, and the second end of the second transistor is connected to the power supply on the second potential side of the second transistor. The third end is connected to the first end of the third transistor, and the second end of the third transistor is connected to a power source having a potential higher than the second potential of the third transistor. 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 supply on the second potential side. The third end of the fourth transistor is connected to the first terminal, the second end of the fifth transistor is connected to the power supply on the second potential side, and the fifth of the fifth transistor. The three ends are connected to the second terminal.

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

In the motor control circuit according to the seventh aspect 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. To control.

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

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

According to the above configuration, the same effect as that of 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 the motor lock may malfunction.

It is a figure which shows the schematic structure of the motor control circuit which concerns on Embodiment 1 of this invention. It is a figure which shows the schematic structure of the motor control circuit which concerns on Embodiment 2 of this invention. It is a figure which shows the schematic structure of the motor control circuit which concerns on Embodiment 3 of this invention. It is a figure which shows the schematic structure of the motor control circuit which concerns on Embodiment 4 of this invention. It is a block diagram which shows the schematic structure of the power window apparatus which concerns on Embodiment 5 of this invention.

[Preface]
The H-bridge circuit is widely known as a circuit for driving a motor, and the motor is controlled by the H-bridge circuit in many situations including control in an automobile. In an H-bridge circuit for driving a motor using a semiconductor, by inputting drive signals to four semiconductor switching elements, conduction and non-conduction of each semiconductor switching element are switched, and forward and reverse rotation of the motor is controlled. ing. When the system is in the sleep state, it is often the case that no drive signal is input to the four semiconductor switching elements (non-conduction). In this state, both ends of the motor are open. Like a generator, a motor is driven by applying force.

Motor control by the H-bridge circuit is also used for power window control of automobiles, and controls the opening and closing of windows by the forward and reverse rotation of the motor. 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 of controlling the brake by using a relay element, but in each of the following embodiments, the function is mainly provided for the H-bridge circuit by using only an electronic element such as a semiconductor switching element. By doing so, the braking force is maintained while suppressing the increase in dark current even in the sleep state.

Regarding the case where brake control is performed using a relay element, the mechanical relay has a limited life and is inferior to a semiconductor element such as a semiconductor switching element from the viewpoint of reliability. The following can also be said for the case where the brake control during sleep is performed mainly using only electronic elements. In order to drive the semiconductor switching element forming the H-bridge circuit, a driver for driving the semiconductor switching element is required. In order to start the driver in the sleep state, it is necessary to start the CPU (Central Processing Unit) as well, and the standby current increases.

In each of the following embodiments, it can be interpreted that it is proposed to provide the H-bridge circuit with a circuit in which both ends of the motor are not opened in the sleep state and both ends of the motor are in the same potential state. This puts the motor in a braked state, making it possible to prevent the window from being forcibly pushed down by hand. Further, the circuit proposed in each of the following embodiments is mainly configured by using only electronic elements, and although there is a standby current due to the current flowing through the resistor, in order to drive the CPU and / or the driver. Compared to the required current, the current flowing is small.

[Embodiment]
A mode for carrying out the present invention will be described below. For convenience of explanation, the same reference numerals may be added to members having the same functions as those described above, and the description 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). Each of these transistors has a first end to a third end defined as follows.

1st end: Bipolar transistor base and MOSFET gate 2nd end: Bipolar transistor emitter and MOSFET source 3rd end: Bipolar transistor collector and MOSFET drain.

[Embodiment 1]
FIG. 1 is a diagram showing a schematic configuration of a motor control circuit 101 according to a first embodiment 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 in the normal direction, 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 is also referred to as rotation control.

The motor lock circuit 2 generates a signal having a predetermined potential in a stopped state of rotation control, and supplies the generated signal to the first terminal T1 and the second terminal T2. As a result, 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. If it is possible to make the potential of the first terminal T1 and the potential of the second terminal T2 the same in the stopped state of the rotation control, the motor lock circuit 2 transmits the generated signal to the first terminal T1 and the second terminal. It may be configured to supply only one of T2.

According to the above configuration, the motor 51 can be locked without using a relay, so that it is possible to reduce the possibility that the lock of the motor 51 will malfunction.

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 the drive of the motor lock circuit 2, and generates a signal for starting the drive of the motor lock circuit 2. The control trigger circuit 7 controls the drive of the control driver 8 (described later).

The potential of the high level power supply 4 is the first potential (for example, 12V), and the potential of the low level power supply 5 is the 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 transistors. 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 response to control by the control trigger circuit 7. The control driver 8 is connected to the first end of the semiconductor switching element Q1, the first end of the semiconductor switching element Q2, the first end of the semiconductor switching element Q3, and the first end of the 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. The third end of the semiconductor switching element Q1 and the third end of the semiconductor switching element Q2 are connected to the high level power supply 4. The second end of the semiconductor switching element Q3 and the 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.

The control driver 8 makes the semiconductor switching element Q1 and the semiconductor switching element Q4 conductive (on), and makes the semiconductor switching element Q2 and the semiconductor switching element Q3 non-conducting (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 in the normal direction.

The control driver 8 conducts the semiconductor switching element Q2 and the semiconductor switching element Q3, and makes the semiconductor switching element Q1 and the semiconductor switching element Q4 non-conducting. 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 reverses.

The motor lock circuit 2 has a first transistor TR1, a second transistor TR2, a third transistor TR3, and a fourth transistor TR4. For the sake of brevity, avoid mentioning each resistor. 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 type MOSFET.

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

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

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

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

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

In the stopped state of rotation control, the drive trigger circuit 6 makes the first transistor TR1 non-conducting. As a result, the second transistor TR2 becomes non-conducting. 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 the lock 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, that is, the predetermined potential is preferably the 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 as 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 has the same potential of the first terminal T1 and the potential of the second terminal T2, the control driver 8 is stopped in order to reduce the 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, when the motor lock circuit 2 has the same potential of the first terminal T1 and the potential of the second terminal T2, the drive trigger circuit 6 can be stopped because the first transistor TR1 is non-conducting. .. 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 that 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 a second embodiment 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, avoid mentioning each resistor.

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 element Q1 and the semiconductor switching element Q2.

In other words, the semiconductor switching element Q1 as the third transistor controls the potential of the first terminal T1 in the rotation control. Similarly, the semiconductor switching element Q2 as the fourth transistor controls the potential of the second terminal T2 in the rotation control. According to the above configuration, since the third transistor and the fourth transistor can be used for both the rotation control and the lock of the motor 51, 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 a third embodiment of the present invention. The motor control circuit 103 differs from the motor control circuit 101 (see FIG. 1) in the following points. For the sake of brevity, avoid mentioning each resistor.

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 having a predetermined potential in a stopped state of rotation control, and supplies the generated signal to the first terminal T1 and the second terminal T2. As a result, 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. If it is possible to make the potential of the first terminal T1 and the potential of the second terminal T2 the same in the stopped state of the rotation control, the motor lock circuit 9 transmits the generated signal to the first terminal T1 and the second terminal. It may be configured to supply only one of T2.

According to the above configuration, the motor 51 can be locked without using a relay, so that it is possible to reduce the possibility that the lock of the motor 51 will malfunction.

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

The motor lock circuit 9 has 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 type MOSFET.

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

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

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

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

The second end of the fifth transistor TR15 is connected to the low level power supply 5. The 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.

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

In the stopped state of rotation control, the drive trigger circuit 6 makes the first transistor TR11 non-conducting. 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 the lock 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, that is, the predetermined potential is preferably the 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 as the second potential. According to the configuration of the motor lock circuit 9 described above, the motor lock circuit 9 in which the predetermined potential is the second potential can be realized.

In a state where the motor lock circuit 9 has the same potential of the first terminal T1 and the potential of the second terminal T2, the control driver 8 is stopped in order to reduce the 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, when the motor lock circuit 9 has the same potential of the first terminal T1 and the potential of the second terminal T2, the drive trigger circuit 6 can be stopped because the first transistor TR11 is non-conducting. .. 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 that 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 a fourth embodiment of the present invention. The motor control circuit 104 differs from the motor control circuit 103 (see FIG. 3) in the following points. For the sake of brevity, avoid mentioning each resistor.

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 the rotation control. Similarly, the semiconductor switching element Q4 as the fifth transistor controls the potential of the second terminal T2 in the rotation control. According to the above configuration, since the fourth transistor and the fifth transistor can be used for both the rotation control and the lock of the motor 51, the total number of transistors can be reduced.

The third end of the third transistor TR13 is replaced with the first end of the semiconductor switching element Q3 and the first end of the semiconductor switching element Q4, and is connected to the first end of the semiconductor switching element Q1 and the first end of the semiconductor switching element Q2. You may. As a result, the predetermined potential can be set as the first potential as in the second embodiment described above.

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

The power window device 301 includes a motor control circuit 201 and an open / close control unit 202. The motor control circuit 201 is any of the motor control circuits 101 to 104 described above. The control target of the motor control circuit 201 is the motor 251. The open / close control unit 202 is composed of hardware and / or software, and is a well-known member that controls the open / close of the window 252 by the motor 251.

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

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

1 Control circuit 2, 9 Motor lock circuit 3 CPU
4 High level power supply (power supply on the 1st potential side)
5 Low level power supply (power supply on the second potential side)
6 Drive trigger circuit 7 Control trigger circuit 8 Control driver 10 Power supply (power supply with a potential higher than the second potential)
51, 251 Motors 101-104, 201 Motor control circuit 202 Open / close control unit 252 Window 301 Power window device D1, D11-D13 Diode Q1-Q4 Semiconductor switching element T1 1st terminal T2 2nd terminal TR1, TR11 1st transistor TR2, TR12 2nd transistor TR3, TR13 3rd transistor TR4, TR14 4th transistor TR15 5th transistor

Claims (8)

A control circuit that controls rotation to control the rotation of the motor according to the difference between the potential of the first terminal of the motor and the potential of the second terminal of the motor.
In the stopped state of the rotation control, a signal having a predetermined potential is generated, and the generated signal is supplied to at least one of the first terminal and the second terminal to obtain the potential of the first terminal and the first terminal. It is equipped with a motor lock circuit that has the same potential as the two terminals.
The control circuit has a control driver that generates a signal for initiating the rotation control.
A motor control circuit, characterized in that 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 in the motor lock circuit. In the rotation control, the control circuit has one of the potential of the first terminal and the potential of the second terminal as the first potential, and the other of the potential of the first terminal and the potential of the second terminal is said. The second potential is lower than the first potential.
The motor control circuit according to claim 1, wherein the predetermined potential is the first potential. The motor lock circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor.
The 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 the second end of the first transistor is connected to a power source on the second potential side. The third end of the first transistor is connected to the first end of the second transistor.
The second end of the second transistor is connected to the power supply on the first potential side, and the third end of the second transistor is the first end of the third transistor and the first end of the fourth transistor. Connected and
The second end of the third transistor is connected to the power supply on the first potential side, and the third end of the third transistor is connected to the first terminal.
2. The second end of the fourth transistor is connected to a power source on the first potential side, and the third end of the fourth transistor is connected to the second terminal. The motor control circuit described in. The third transistor controls the potential of the first terminal in the rotation control, and controls the potential of the first terminal.
The motor control circuit according to claim 3, wherein the fourth transistor controls the potential of the second terminal in the rotation control. In the rotation control, the control circuit has one of the potential of the first terminal and the potential of the second terminal as the first potential, and the other of the potential of the first terminal and the potential of the second terminal is said. The second potential is lower than the first potential.
The motor control circuit according to claim 1, wherein the predetermined potential is the second potential. The motor lock circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor.
The 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 the second end of the first transistor is connected to a power source on the second potential side. The third end of the first transistor is connected to the first end of the second transistor.
The second end of the second transistor is connected to the power supply on the second potential side, and the third end of the second transistor is connected to the 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 the first end of the fourth transistor and the fifth transistor. It is connected to the first end and
The second end of the fourth transistor is connected to the power supply on the second potential side, and the third end of the fourth transistor is connected to the first terminal.
5. The second end of the fifth transistor is connected to the power source on the second potential side, and the third end of the fifth transistor is connected to the second terminal. The motor control circuit described in. The fourth transistor controls the potential of the first terminal in the rotation control, and controls the potential of the first terminal.
The motor control circuit according to claim 6, wherein the fifth transistor controls the potential of the second terminal in the rotation control. The motor control circuit according to any one of claims 1 to 7.
A power window device including an opening / closing control unit that controls opening / closing of a window by a motor that is a control target of the motor control circuit.

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