JP6657472B1 - VEHICLE MOTOR DRIVE CONTROL DEVICE AND VEHICLE MOTOR DRIVE CONTROL DEVICE CONTROL METHOD - Google Patents

Abstract

The control unit of the vehicle motor drive control device switches between control for turning off the high side switch and PWM control, and switching between control for turning on the low side switch and PWM control according to the phase of the motor. Further, during PWM control of the high-side switch, the control unit PWM-controls the low-side switch so that the high-side switch and the low-side switch complementarily turn on / off, so that the motor is energized at 120 degrees or 180 degrees. To control the first to third half bridges.

Description

  The present invention relates to a vehicle motor drive control device and a control method of the vehicle motor drive control device.

  Conventionally, there is a motor drive control device that supplies a three-phase AC voltage obtained by converting the DC voltage output from a DC power supply to a three-phase motor and drives the three-phase motor (for example, Japanese Patent Application Laid-Open No. 2010-011628). reference).

  In such a conventional motor drive control device, for example, as shown in FIG. 12, FIG. 13A, FIG. 13B, FIG. 14A, and FIG. At this time, a negative current to the battery is generated by the electromotive force from the motor (FIG. 14B). Note that FIGS. 13A and 14A show a state where a switch under PWM control is on. On the other hand, FIGS. 13B and 14B show a state in which the switch under PWM control is off.

  That is, in the conventional motor drive control device, an unacceptable negative current may occur depending on the combination of the battery and the motor.

  In this case, it is necessary to add a circuit for avoiding a negative current flowing to the battery and to execute control for changing the switching method at an arbitrary timing, which leads to an increase in the cost of the device and complexity of the control.

  As described above, in the conventional vehicle motor drive control device, there is a problem that the generation of the negative current flowing to the battery cannot be suppressed without increasing the cost of the device or complicating the control.

  Therefore, an object of the present invention is to provide a motor drive control device for a vehicle that can suppress the generation of a negative current flowing to a battery without increasing the cost of the device or complicating the control.

The vehicle motor drive control device according to the embodiment according to one aspect of the present invention includes:
A vehicle motor drive control device for converting a DC output from a battery into a three-phase AC, and supplying the three-phase AC to a three-phase motor of the vehicle to drive the vehicle.
A power terminal to which the positive electrode of the battery is connected, and a ground terminal to which the negative electrode of the battery is connected,
A first motor terminal connected to a first coil of the motor, a second motor terminal connected to a second coil of the motor, and a third motor terminal connected to a third coil of the motor;
A high-side switch and a low-side switch are connected in series between the power terminal and the ground terminal, and a connection point between the high-side switch and the low-side switch is the first to third motors. First to third half bridges connected to the terminals and connected in parallel with each other;
A control unit that controls the first to third half bridges to drive the motor M,
The control unit includes:
In accordance with the phase of the motor, while switching between the control to turn off the high-side switch and the PWM control, switching between the control to turn on the low-side switch and the PWM control,
Further, during PWM control of the high-side switch, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily. The first to third half bridges are controlled so as to be energized.

In the vehicle motor drive control device,
The first half bridge includes:
A first high-side switch having one end connected to the power terminal and the other end connected to the first motor terminal;
A first high-side diode having a cathode connected to one end of the first high-side switch and an anode connected to the other end of the first high-side switch;
A first low-side switch having one end connected to the first motor terminal and the other end connected to the ground terminal;
A first low-side diode having a cathode connected to one end of the first low-side switch and an anode connected to the other end of the first low-side switch;
The second half bridge includes:
A second high-side switch having one end connected to the power terminal and the other end connected to the second motor terminal;
A second high-side diode having a cathode connected to one end of the second high-side switch and an anode connected to the other end of the second high-side switch;
A second low-side switch having one end connected to the second motor terminal MT2 and the other end connected to the ground terminal;
A second low-side diode having a cathode connected to one end of the second low-side switch and an anode connected to the other end of the second low-side switch;
The third half bridge,
A third high-side switch having one end connected to the power supply terminal and the other end connected to the third motor terminal;
A third high-side diode having a cathode connected to one end of the third high-side switch and an anode connected to the other end of the third high-side switch;
A third low-side switch having one end connected to the third motor terminal and the other end connected to the ground terminal;
A third low-side diode having a cathode connected to one end of the third low-side switch and an anode connected to the other end of the third low-side switch.

In the vehicle motor drive control device,
The control unit includes:
When energizing the motor at 120 degrees,
In the first stage, the first high-side switch and the first low-side switch are PWM-controlled, the second high-side switch is turned off, the second low-side switch is PWM-controlled, and the third high-side switch is turned off. And turn on the third low-side switch,
In a second stage following the first stage, the first high-side switch is turned off, the first low-side switch is PWM-controlled, the second high-side switch and the second low-side switch are PWM-controlled, and 3 Turn off the high-side switch and turn on the third low-side switch,
In a third stage subsequent to the second stage, the first high-side switch is turned off and the first low-side switch is turned on, the second high-side switch and the second low-side switch are PWM-controlled, and the third The high side switch is turned off and the third low side switch is PWM controlled.

In the vehicle motor drive control device,
The control unit includes:
When the motor is energized by 180 degrees,
In a fourth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch is turned off, the second low-side switch is turned on, and the third high-side switch and the third high-side switch are turned on. PWM control the low side switch,
In a fifth stage following the fourth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch is turned off, the second low-side switch is turned on, and the third stage is turned on. Turn off the high-side switch and turn on the third low-side switch,
In a sixth stage following the fifth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch and the second low-side switch are subjected to PWM control, and the third high-side switch is controlled. The switch is turned off and the third low-side switch is turned on.

In the vehicle motor drive control device,
Further comprising a detection unit that detects the phase of the motor, and outputs a detection signal corresponding to the detected phase of the motor,
The control unit includes:
The first to third half bridges are controlled based on the phase of the motor detected by the detection unit.

In the vehicle motor drive control device,
The control unit includes:
The rotation speed of the motor is obtained based on the detection signal.

In the vehicle motor drive control device,
The control unit includes:
When the rotation speed of the motor is lower than a preset threshold rotation speed, the first to third half bridges are controlled such that the motor is energized at 120 degrees.

In the vehicle motor drive control device,
The control unit includes:
If the rotation speed of the motor is equal to or higher than the threshold rotation speed, the first to third half bridges are controlled such that the motor is energized by 180 degrees.
It is characterized by the following.

In the vehicle motor drive control device,
The control unit includes:
A frequency at which the high-side switch is turned on / off by PWM control is made equal to a frequency at which the low-side switch is turned on / off by PWM control.

In the vehicle motor drive control device,
The vehicle is an electric motorcycle,
The vehicle motor drive control device is mounted on an electric motorcycle,
The motor is connected to wheels of the electric motorcycle.

In the vehicle motor drive control device,
When the battery is loaded on the electric motorcycle, the battery is not charged by regeneration,
When the battery is not loaded on the electric motorcycle, the battery is charged by an external charging device.

In the vehicle motor drive control device,
When the rotation of the wheels of the electric motorcycle is braked by the motor, the back electromotive force of the motor is not regenerated by the battery.

In the vehicle motor drive control device,
The detection unit,
It is a Hall sensor that outputs a detection signal corresponding to the phase of the motor to the control unit.

In the vehicle motor drive control device,
The first to third high-side switches and the first to third low-side switches are MOS transistors each having one end serving as a drain and the other end serving as a source.

The control method of the vehicle motor drive control device according to the embodiment according to an aspect of the present invention includes:
A motor drive control device for a vehicle for converting a direct current output from a battery into a three-phase alternating current, and supplying the three-phase alternating current to a three-phase motor of the vehicle to drive the vehicle. A power terminal, a ground terminal to which a negative electrode of the battery is connected, a first motor terminal connected to a first coil of the motor, a second motor terminal connected to a second coil of the motor, and A third motor terminal connected to a third coil of the motor, and a high-side switch and a low-side switch connected in series between the power supply terminal and the ground terminal; First to third half-bridges connected to the first to third motor terminals at respective connection points of the motor M and the low-side switch; A control unit for controlling the first through third half-bridge to drive a control method of the vehicle motor drive control device provided with,
The control unit includes:
In accordance with the phase of the motor, while switching between the control to turn off the high-side switch and the PWM control, switching between the control to turn on the low-side switch and the PWM control,
Further, during PWM control of the high-side switch, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily. The first to third half bridges are controlled so as to be energized.

  A vehicle motor drive control device according to one embodiment of the present invention converts a direct current output from a battery into a three-phase alternating current, and supplies the three-phase alternating current to a three-phase motor of the vehicle to drive the vehicle. Motor drive control device, comprising: a power supply terminal connected to a positive electrode of a battery; a ground terminal connected to a negative electrode of the battery; a first motor terminal connected to a first coil of the motor; A high-side switch and a low-side switch are connected in series between a second motor terminal connected to the coil, a third motor terminal connected to the third coil of the motor M, and a power supply terminal and a ground terminal. A first to third half-bridge, wherein connection points of the high-side switch and the low-side switch are respectively connected to the first to third motor terminals and connected in parallel with each other; And a control unit for controlling the first through third half-bridge to drive the motor M, the.

  The control unit switches between the control for turning off the high-side switch and the PWM control in accordance with the phase of the motor, and switches between the control for turning on the low-side switch and the PWM control. Controlling the first to third half-bridges so that the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily, and the motor is energized 120 degrees or 180 degrees. I do.

  As a result, according to the motor drive control device for a vehicle of the present invention, it is possible to suppress the generation of the negative current flowing to the battery without increasing the cost of the device or complicating the control.

FIG. 1 is a diagram illustrating an example of the configuration of the vehicle motor drive control device 100 according to the first embodiment. FIG. 2 shows the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q6) when the motor M is energized at 120 degrees in the control method of the vehicle motor drive control device 100. FIG. 5 is a diagram showing an example of the operation sequence of FIG. FIG. 3A is a diagram illustrating an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence illustrated in FIG. 2. FIG. 3B is a diagram illustrating an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence illustrated in FIG. 2. FIG. 4A is a diagram showing an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence shown in FIG. FIG. 4B is a diagram showing an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence shown in FIG. FIG. 5A is a diagram showing an example of a current path of the vehicle motor drive control device in stage 3 of the operation sequence shown in FIG. FIG. 5B is a diagram illustrating an example of a current path of the vehicle motor drive control device in stage 3 of the operation sequence illustrated in FIG. 2. FIG. 6A is a diagram showing an example of a current path of the vehicle motor drive control device when switching from the stage 3 to the stage 4 in the operation sequence shown in FIG. 6B is a diagram showing an example of a current path of the vehicle motor drive control device when switching from the stage 3 to the stage 4 in the operation sequence shown in FIG. FIG. 7 shows the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q3) when the motor M is energized by 180 degrees in the control method of the vehicle motor drive control device 100. It is a figure showing an example of operation sequence of Q6). FIG. 8A is a diagram illustrating an example of a current path of the vehicle motor drive control device in stage 1 of the operation sequence illustrated in FIG. 7. FIG. 8B is a diagram showing an example of a current path of the vehicle motor drive control device in stage 1 of the operation sequence shown in FIG. FIG. 9A is a diagram showing an example of a current path of the vehicle motor drive control device when switching from the stage 1 to the stage 2 in the operation sequence shown in FIG. FIG. 9B is a diagram illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 1 to the stage 2 in the operation sequence illustrated in FIG. 7. FIG. 10A is a diagram illustrating an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence illustrated in FIG. 7. FIG. 10B is a diagram showing an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence shown in FIG. FIG. 11A is a diagram illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence illustrated in FIG. 7. 11B is a diagram illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence illustrated in FIG. 7. FIG. 12 is a diagram showing an example of a conventional operation sequence of the first to third half bridges when the motor M is energized by 120 degrees in the control method of the conventional vehicle motor drive control device. FIG. 13A is a diagram showing an example of a current path of the vehicle motor drive control device in stage 2 of the conventional operation sequence shown in FIG. FIG. 13B is a diagram showing an example of a current path of the vehicle motor drive control device in stage 2 of the conventional operation sequence shown in FIG. FIG. 14A is a diagram showing an example of a current path of the vehicle motor drive control device in stage 2 of the conventional operation sequence shown in FIG. FIG. 14B is a diagram showing an example of a current path of the vehicle motor drive control device when switching from stage 2 to stage 3 in the conventional operation sequence shown in FIG.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

  The vehicle motor drive control device 100 according to the first embodiment converts, for example, a DC output from the battery B into a three-phase AC, and converts the three-phase AC into a three-phase AC of the vehicle, as illustrated in FIG. The motor M is supplied and driven.

  Here, the vehicle is, for example, an electric motorcycle. In this case, the vehicle motor drive control device 100 is mounted on an electric motorcycle.

  Further, the motor M is connected to wheels of the electric motorcycle so that torque can be transferred.

  In the example of FIG. 1, the motor M has a star connection configuration, but may have a delta connection configuration.

  When the battery B is loaded on the electric motorcycle, the battery B is not charged by regeneration, for example.

  That is, for example, when the rotation of the wheels of the electric motorcycle is braked by the motor M, the back electromotive force of the motor M is not regenerated to the battery B.

  Further, when the battery B is not loaded on the electric motorcycle, the battery is charged by, for example, an external charging device (not shown).

  Such a vehicle motor drive control device 100 includes, for example, as shown in FIG. 1, a power terminal BT1, a ground terminal BT2, a first motor terminal MT1, a second motor terminal MT2, and a third motor terminal MT3. , A first half bridge (Q1, Q2), a second half bridge (Q3, Q4), a third half bridge (Q5, Q6), a detection unit RD, and a control unit CPU.

  Note that the first half bridge (Q1, Q2), the second half bridge (Q3, Q4), and the third half bridge (Q5, Q6) constitute a driver circuit X.

  The power supply terminal BT1 is connected to the positive electrode of the battery B, for example, as shown in FIG.

  Further, the ground terminal BT2 is connected to, for example, the negative electrode of the battery B as shown in FIG.

  The first motor terminal MT1 is connected to one end of a first coil L1 of the motor M, for example, as shown in FIG.

  Note that the other end of the first coil L1 is connected to the center terminal ML.

  The second motor terminal MT2 is connected to one end of a second coil L2 of the motor M, for example, as shown in FIG.

  Note that the other end of the second coil L2 is connected to the center terminal ML.

  The third motor terminal MT3 is connected to one end of a third coil L3 of the motor M, for example, as shown in FIG.

  Note that the other end of the third coil L3 is connected to the center terminal ML.

  The first half bridge (Q1, Q2) is configured by connecting a high-side switch Q1 and a low-side switch Q2 in series between a power supply terminal BT1 and a ground terminal BT2.

  A connection point between the high side switch Q1 and the low side switch Q2 of the first half bridge is connected to the first motor terminal MT1.

  The first half bridge (Q1, Q2) includes, for example, as shown in FIG. 1, a first high-side switch Q1, a first high-side diode D1, a first low-side switch Q2, and a first low-side diode D2. And

  The first high-side switch Q1 has one end connected to the power supply terminal BT1 and the other end connected to the first motor terminal MT1.

  The first high-side switch Q1 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The first high-side diode D1 has a cathode connected to one end of the first high-side switch Q1 and an anode connected to the other end of the first high-side switch Q1.

  The first low-side switch Q2 has one end connected to the first motor terminal MT1 and the other end connected to the ground terminal BT2.

  The first low-side switch Q2 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The first low-side diode D2 has a cathode connected to one end of the first low-side switch Q2, and an anode connected to the other end of the first low-side switch Q2.

  The second half bridge (Q3, Q4) is configured by connecting a high-side switch Q3 and a low-side switch Q4 in series between a power supply terminal BT1 and a ground terminal BT2.

  The connection point between the high-side switch Q3 and the low-side switch Q4 of the second half bridge (Q3, Q4) is connected to the second motor terminal MT2.

  The second half bridge (Q3, Q4) includes, for example, as shown in FIG. 1, a second high-side switch Q3, a second high-side diode D3, a second low-side switch Q4, and a second low-side diode D4. And

  The second high-side switch Q3 has one end connected to the power supply terminal BT1 and the other end connected to the second motor terminal MT2.

  The second high-side switch Q3 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The second high-side diode D3 has a cathode connected to one end of the second high-side switch Q3 and an anode connected to the other end of the second high-side switch Q3.

  The second low-side switch Q4 has one end connected to the second motor terminal MT2 and the other end connected to the ground terminal BT2.

  The second low-side switch Q4 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The second low-side diode D4 has a cathode connected to one end of the second low-side switch Q4 and an anode connected to the other end of the second low-side switch Q4.

  The third half bridge (Q5, Q6) is configured by connecting a high-side switch Q5 and a low-side switch Q6 in series between a power supply terminal BT1 and a ground terminal BT2.

  The connection point between the high side switch Q5 and the low side switch Q6 of the third half bridge (Q5, Q6) is connected to the third motor terminal MT3.

  The third half bridge (Q5, Q6) includes, for example, as shown in FIG. 1, a third high-side switch Q5, a third high-side diode D5, a third low-side switch Q6, and a third low-side diode D6. And

  The third high-side switch Q5 has one end connected to the power supply terminal BT1 and the other end connected to the third motor terminal MT3.

  The third high-side switch Q5 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The third high-side diode D5 has a cathode connected to one end of the third high-side switch Q5 and an anode connected to the other end of the third high-side switch Q5.

  The third low-side switch Q6 has one end connected to the third motor terminal MT3 and the other end connected to the ground terminal BT2.

  The third low-side switch Q6 is, for example, a MOS transistor having one end as a drain and the other end as a source, as shown in FIG.

  The third low-side diode D6 has a cathode connected to one end of the third low-side switch Q6 and an anode connected to the other end of the third low-side switch Q6.

  These first to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q6) are connected in parallel, for example, as shown in FIG.

  Further, the detection unit RD detects the phase of the motor M, for example, and outputs a detection signal SRD corresponding to the detected phase of the motor M, as shown in FIG.

  The detection unit RD is, for example, a Hall sensor that outputs a detection signal SDR corresponding to the phase of the motor M to the control unit.

  Further, the control unit CPU controls the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q6) to drive the motor M, for example, as shown in FIG. It has become.

  The control unit CPU switches between the control for turning off the high-side switch and the PWM control and the control for turning on the low-side switch and the PWM control in accordance with the phase of the motor M, for example (described later). 2 and 7).

  Further, at the time of PWM control of the high-side switch, the control unit CPU performs PWM control of the low-side switch so that the high-side switch and the low-side switch are turned on / off complementarily. The first to third half bridges are controlled so as to be energized each time.

  Further, the control unit CPU determines the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5) based on the phase of the motor M detected by the detection unit RD (information of the detection signal SRD). , Q6).

  Further, the control unit CPU acquires information on the rotation speed (number of rotations) of the motor M based on the detection signal SRD output from the detection unit RD.

  When the rotation speed of the motor M is lower than a preset threshold rotation speed, the control unit CPU controls the first to third half bridges (Q1, Q2), ( Q3, Q4) and (Q5, Q6).

  When the rotation speed of the motor M is equal to or higher than the threshold rotation speed, the control unit CPU controls the first to third half bridges (Q1, Q2), (Q3, Q4) and (Q5, Q6) are controlled.

  The control unit CPU sets the frequency at which each high-side switch is turned on / off by PWM control to be the same as the frequency at which each low-side switch is turned on / off by PWM control.

  Next, an example of a control method of the vehicle motor drive control device 100 having the above configuration will be described.

  Here, FIG. 2 shows the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5) when the motor M is energized by 120 degrees in the control method of the vehicle motor drive control device 100. , Q6) are diagrams showing an example of the operation sequence. 3A and 3B are diagrams illustrating an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence illustrated in FIG. 4A and 4B are diagrams illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence illustrated in FIG. 5A and 5B are diagrams illustrating an example of a current path of the vehicle motor drive control device in stage 3 of the operation sequence illustrated in FIG. 6A and 6B are diagrams illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 3 to the stage 4 in the operation sequence illustrated in FIG.

  Note that FIGS. 3A, 4A, 5A, and 6A show a state in which a switch under PWM control is on. On the other hand, FIG. 3B, FIG. 4B, FIG. 5B, and FIG. 6B show a state where the switch under PWM control is off.

  For example, as described above, the control unit CPU acquires information on the rotation speed (number of rotations) of the motor M based on the detection signal SRD output from the detection unit RD.

  When the rotation speed of the motor M is lower than a preset threshold rotation speed, the control unit CPU controls the first to third half bridges (Q1, Q2), ( Q3, Q4) and (Q5, Q6).

  Here, for example, when energizing the motor M by 120 degrees, the control unit CPU performs PWM control on the first high-side switch Q1 and the first low-side switch Q2 in the first stage (stage 2 in FIG. 2). The third high-side switch Q3 is turned off and the second low-side switch Q4 is subjected to PWM control, and the third high-side switch Q5 is turned off and the third low-side switch Q6 is turned on (FIGS. 3A and 3B).

  As a result, for example, as shown in FIG. 3B, even when the first high-side switch Q1 that has been subjected to the PWM control signal is off, the current continues to flow through the first and third low-side switches Q2 and Q6.

  Further, when energizing the motor M by 120 degrees, the control unit CPU turns off the first high-side switch Q1 and turns off the first low-side switch Q2 in the second stage (stage 3 in FIG. 2) following the first stage. Is PWM-controlled, the second high-side switch Q3 and the second low-side switch Q4 are PWM-controlled, and the third high-side switch Q5 is turned off and the third low-side switch Q6 is turned on (FIGS. 4A and 4B).

  As shown in FIG. 4A, when the first high-side switch Q1 that is receiving the PWM control signal is on, the current flowing through the first coil L1 until the current flowing through the stage 2 in FIG. 2 becomes zero. , There is a current that continues to flow through the first low-side diode of the first low-side switch Q2. Therefore, no negative current flows through the battery.

  Also, as shown in FIG. 4B, when the first high-side switch Q1 that is receiving the PWM control signal is off, there is a path through which the current flowing through the third coil L3 flows to the low-side switch. Therefore, no negative current flows because the current continues to flow in the low-side switch.

  In the stage 3 of FIG. 2, when the energy of the first coil L1 becomes zero as shown in FIG. 5A when the third high-side switch Q3, which is subjected to the PWM control signal, is turned on, the first coil L1 is turned on. The current stops flowing. Then, when the energy of the first coil L1 becomes zero as shown in FIG. 5B when the third high-side switch Q3 that has been subjected to the PWM control signal is off, current flows through the second and third coils L2 and L3. to continue.

  Further, when energizing the motor M by 120 degrees, the control unit CPU turns off the first high-side switch Q1 and turns off the first low-side switch Q2 in the third stage (stage 4 in FIG. 2) following the second stage. Is turned on, the second high-side switch Q3 and the second low-side switch Q4 are subjected to PWM control, the third high-side switch Q5 is turned off, and the third low-side switch Q6 is subjected to PWM control (FIGS. 6A and 6B).

  As shown in FIG. 6A, when the second high-side switch Q3, which is under the PWM control signal, is on, the current flowing through the third coil L3 flowing through the stage 3 in FIG. 3 Continue to flow through the high-side diode. Therefore, no negative current flows through the battery.

  Further, as shown in FIG. 6B, when the second high-side switch Q3 that is being subjected to the PWM control signal is off, current continues to flow through the second low-side switch Q4 that is subjected to the PWM control signal, and flows through the third coil L3. The current also flows through the third low-side switch Q6 that is being subjected to the PWM control signal. Therefore, no negative current flows through the battery.

  Here, FIG. 7 shows the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5) when the motor M is energized by 180 degrees in the control method of the vehicle motor drive control device 100. , Q6) are diagrams showing an example of the operation sequence. 8A and 8B are diagrams showing an example of a current path of the vehicle motor drive control device in stage 1 of the operation sequence shown in FIG. 9A and 9B are diagrams illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 1 to the stage 2 in the operation sequence illustrated in FIG. 10A and 10B are diagrams illustrating an example of a current path of the vehicle motor drive control device in stage 2 of the operation sequence illustrated in FIG. 11A and 11B are diagrams illustrating an example of a current path of the vehicle motor drive control device when switching from the stage 2 to the stage 3 in the operation sequence illustrated in FIG.

  FIGS. 8A, 9A, 10A, and 11A show a state in which the switch under PWM control is on. On the other hand, FIG. 8B, FIG. 9B, FIG. 10B, and FIG. 11B show a state where the switch under PWM control is off.

  For example, as described above, the control unit CPU acquires information on the rotation speed (number of rotations) of the motor M based on the detection signal SRD output from the detection unit RD.

  Then, as described above, for example, when the rotation speed of the motor M is equal to or higher than the threshold rotation speed, the control unit CPU causes the first to third half bridges ( Q1, Q2), (Q3, Q4), (Q5, Q6).

  Here, for example, when energizing the motor M by 180 degrees, the control unit CPU performs PWM control on the first high-side switch Q1 and the first low-side switch Q2 in the fourth stage (stage 1 in FIG. 7), The third high-side switch Q3 is turned off, the second low-side switch Q4 is turned on, and the third high-side switch Q5 and the third low-side switch Q6 are PWM-controlled (FIGS. 8A and 8B).

  As a result, for example, as shown in FIG. 8B, even when the first and third high-side switches Q1 and Q5 for which the PWM control signal is turned off, the current continues to flow through the low-side switch.

  Further, when the motor M is energized by 180 degrees, the control unit CPU performs PWM control on the first high-side switch Q1 and the first low-side switch Q2 in the fifth stage (stage 2 in FIG. 7) following the fourth stage. Then, the third high-side switch Q3 is turned off and the second low-side switch Q4 is turned on, and the third high-side switch Q5 is turned off and the third low-side switch Q6 is turned on (FIGS. 9A and 9B).

  As shown in FIG. 9A, when the first high-side switch Q1 that is receiving the PWM control signal is turned on, the current flows through the third low-side switch L3 until the current of the third coil L3 flowing through the stage 1 in FIG. It continues to flow through switch Q6. However, since there are currents flowing through the first and second coils L1 and L2, no negative current flows through the battery.

  Further, as shown in FIG. 9B, when the first high-side switch Q1 that is subjected to the PWM control signal is off, there is a path through which the current flows through the low-side switch, so that the current continues to flow through the low-side switch. Therefore, no negative current flows through the battery.

  Then, when the first high-side switch Q1 that has been subjected to the PWM control signal is on in the stage 2 of FIG. 7, the current flows to the second and third low-side switches Q4 and Q6 as shown in FIG. 10A. When the first high-side switch Q1 receiving the PWM control signal is off, current continues to flow in the first, second, and third low-side switches Q1, Q2, and Q3, as shown in FIG. 10B.

  Further, when energizing the motor M by 180 degrees, the control unit CPU performs PWM control on the first high-side switch Q1 and the first low-side switch Q2 in the sixth stage (stage 3 in FIG. 7) following the fifth stage. Then, the third high-side switch Q3 and the second low-side switch Q4 are PWM-controlled, and the third high-side switch Q5 is turned off and the third low-side switch Q6 is turned on (FIGS. 11A and 11B).

  As shown in FIG. 11A, when the second high-side switch Q3, which is under the PWM control signal, is on, the current flowing through the second coil L2 flowing through the stage 2 in FIG. 7 passes through the second high-side switch Q2. Keep flowing. Therefore, no negative current flows through the battery.

  Further, as shown in FIG. 11B, when the second high-side switch Q3 that is being subjected to the PWM control signal is off, a current flows through the first and second low-side switches Q2 and Q4 that are subjected to the PWM control signal. Therefore, no negative current flows through the battery.

  As described above, the control unit CPU of the vehicle motor drive control device 100 switches between the control to turn off the high side switch and the PWM control according to the phase of the motor M, the control to turn on the low side switch, and the PWM control. Further, at the time of PWM control of the high-side switch, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily. To control the first to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q6).

  As a result, according to the vehicle motor drive control device 100 according to the first embodiment, the generation of the negative current flowing to the battery B can be suppressed without increasing the cost of the device or complicating the control.

  In the first embodiment, one end of each of the first to third high-side switches Q1, Q3, Q5 and the first to third low-side switches Q2, Q4, Q6 is a drain, and the other end is a source. Although the description has been given of the example in which the MOS transistor is used, another semiconductor element may be applied.

  That is, the first to third high-side switches Q1, Q3, Q5 and the first to third low-side switches Q2, Q4, Q6 are bipolar transistors or other semiconductor elements so that the same function can be performed. May be substituted.

  The other configurations of the vehicle motor drive control device according to the second embodiment are the same as those of the first embodiment.

  As described above, the motor drive control device for a vehicle according to one embodiment of the present invention converts the DC output from the battery B into three-phase AC and supplies the three-phase AC to the three-phase motor M of the vehicle. And a ground terminal BT2 to which a positive electrode of the battery B is connected, a ground terminal BT2 to which a negative electrode of the battery B is connected, and a first coil of the motor M. , A first motor terminal MT1 connected to the second coil of the motor M, a third motor terminal MT3 connected to the third coil of the motor M, a power terminal BT1 and the ground. A high-side switch and a low-side switch are connected in series between the terminal BT2 and a connection point between the high-side switch and the low-side switch is connected to the first to third modes, respectively. First to third half bridges (Q1, Q2), (Q3, Q4), (Q5, Q6) connected to terminals MT1, MT2, MT3 and connected in parallel to each other, and a first half bridge (Q5, Q6) for driving the motor M. A control unit CPU that controls the first to third half bridges.

  The control unit CPU switches between the control for turning off the high-side switch and the PWM control in accordance with the phase of the motor, the control for turning on the low-side switch and the PWM control, and further performs the PWM control for the high-side switch. Sometimes, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily, and the first to third half-bridges are energized by 120 degrees or 180 degrees to energize the motor. Control.

  Thus, according to the motor drive control device for a vehicle of the present invention, it is possible to suppress the generation of the negative current flowing to the battery without increasing the cost of the device or complicating the control.

  In each embodiment, the case where the motor M has a star connection configuration has been described. However, the motor M may have a delta connection configuration that is equivalent in circuit to the star connection.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and equivalents thereof.

100 Motor drive control device for vehicle BT1 Power supply terminal BT2 Ground terminal MT1 First motor terminal MT2 Second motor terminal MT3 Third motor terminal Q1, Q2 First half bridge Q3, Q4 Second half bridge Q5, Q6 Third half bridge CPU Control unit RD detection unit
Q1 First high side switch D1 First high side diode Q2 First low side switch D2 First low side diode Q3 Second high side switch D3 Second high side diode Q4 Second low side switch D4 Second low side diode Q5 Third high side switch D5 Third high-side diode Q6 Third low-side switch D6 Third low-side diode

Claims (15)

A vehicle motor drive control device for converting a DC output from a battery into a three-phase AC, and supplying the three-phase AC to a three-phase motor of the vehicle to drive the vehicle.
A power terminal to which the positive electrode of the battery is connected, and a ground terminal to which the negative electrode of the battery is connected,
A first motor terminal connected to a first coil of the motor, a second motor terminal connected to a second coil of the motor, and a third motor terminal connected to a third coil of the motor;
A high-side switch and a low-side switch are connected in series between the power terminal and the ground terminal, and a connection point between the high-side switch and the low-side switch is the first to third motors. First to third half bridges connected to the terminals and connected in parallel with each other;
A control unit that controls the first to third half bridges to drive the motor M,
The control unit includes:
In accordance with the phase of the motor, while switching between the control to turn off the high-side switch and the PWM control, switching between the control to turn on the low-side switch and the PWM control,
Further, during PWM control of the high-side switch, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily. A motor drive control device for a vehicle, wherein the first to third half bridges are controlled so as to be energized. The first half bridge includes:
A first high-side switch having one end connected to the power terminal and the other end connected to the first motor terminal;
A first high-side diode having a cathode connected to one end of the first high-side switch and an anode connected to the other end of the first high-side switch;
A first low-side switch having one end connected to the first motor terminal and the other end connected to the ground terminal;
A first low-side diode having a cathode connected to one end of the first low-side switch and an anode connected to the other end of the first low-side switch;
The second half bridge includes:
A second high-side switch having one end connected to the power terminal and the other end connected to the second motor terminal;
A second high-side diode having a cathode connected to one end of the second high-side switch and an anode connected to the other end of the second high-side switch;
A second low-side switch having one end connected to the second motor terminal MT2 and the other end connected to the ground terminal;
A second low-side diode having a cathode connected to one end of the second low-side switch and an anode connected to the other end of the second low-side switch;
The third half bridge,
A third high-side switch having one end connected to the power supply terminal and the other end connected to the third motor terminal;
A third high-side diode having a cathode connected to one end of the third high-side switch and an anode connected to the other end of the third high-side switch;
A third low-side switch having one end connected to the third motor terminal and the other end connected to the ground terminal;
The vehicle motor drive according to claim 1, further comprising: a third low-side diode having a cathode connected to one end of the third low-side switch and an anode connected to the other end of the third low-side switch. Control device. The control unit includes:
When energizing the motor at 120 degrees,
In the first stage, the first high-side switch and the first low-side switch are PWM-controlled, the second high-side switch is turned off, the second low-side switch is PWM-controlled, and the third high-side switch is turned off. And turn on the third low-side switch,
In a second stage following the first stage, the first high-side switch is turned off, the first low-side switch is PWM-controlled, the second high-side switch and the second low-side switch are PWM-controlled, and 3 Turn off the high-side switch and turn on the third low-side switch,
In a third stage subsequent to the second stage, the first high-side switch is turned off and the first low-side switch is turned on, the second high-side switch and the second low-side switch are PWM-controlled, and the third The motor drive control device for a vehicle according to claim 2, wherein the high-side switch is turned off and the third low-side switch is subjected to PWM control. The control unit includes:
When the motor is energized by 180 degrees,
In a fourth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch is turned off, the second low-side switch is turned on, and the third high-side switch and the third high-side switch are turned on. PWM control the low side switch,
In a fifth stage following the fourth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch is turned off, the second low-side switch is turned on, and the third stage is turned on. Turn off the high-side switch and turn on the third low-side switch,
In a sixth stage following the fifth stage, the first high-side switch and the first low-side switch are subjected to PWM control, the second high-side switch and the second low-side switch are subjected to PWM control, and the third high-side switch is controlled. The vehicle motor drive control device according to claim 3, wherein the switch is turned off and the third low side switch is turned on. Further comprising a detection unit that detects the phase of the motor, and outputs a detection signal corresponding to the detected phase of the motor,
The control unit includes:
The motor drive control device for a vehicle according to claim 4, wherein the first to third half bridges are controlled based on a phase of the motor detected by the detection unit. The control unit includes:
The motor drive control device for a vehicle according to claim 5, wherein a rotation speed of the motor is acquired based on the detection signal. The control unit includes:
When the rotation speed of the motor is lower than a preset threshold rotation speed, the first to third half bridges are controlled so that the motor is energized by 120 degrees. Vehicle motor drive control device. The control unit includes:
If the rotation speed of the motor is equal to or higher than the threshold rotation speed, the first to third half bridges are controlled such that the motor is energized by 180 degrees.
The motor drive control device for a vehicle according to claim 7, wherein: The control unit includes:
2. The motor drive control device for a vehicle according to claim 1, wherein a frequency at which the high-side switch is turned on / off by PWM control is the same as a frequency at which the low-side switch is turned on / off by PWM control. 3. The vehicle is an electric motorcycle,
The vehicle motor drive control device is mounted on an electric motorcycle,
The drive device according to claim 4, wherein the motor is connected to wheels of the electric motorcycle. When the battery is loaded on the electric motorcycle, the battery is not charged by regeneration,
The motor drive control device for a vehicle according to claim 10, wherein the battery is charged by an external charging device when the battery is not loaded on the electric motorcycle. The motor drive control device for a vehicle according to claim 11, wherein when the rotation of the wheels of the electric motorcycle is braked by the motor, the back electromotive force of the motor is not regenerated by the battery. . The detection unit,
The motor drive control device for a vehicle according to claim 8, wherein the hall sensor outputs a detection signal corresponding to a phase of the motor to the control unit. 5. The MOS transistor according to claim 4, wherein the first to third high-side switches and the first to third low-side switches are MOS transistors each having one end as a drain and the other end as a source. Vehicle motor drive control device. A motor drive control device for a vehicle for converting a direct current output from a battery into a three-phase alternating current, and supplying the three-phase alternating current to a three-phase motor of the vehicle to drive the vehicle. A power terminal, a ground terminal to which a negative electrode of the battery is connected, a first motor terminal connected to a first coil of the motor, a second motor terminal connected to a second coil of the motor, and A third motor terminal connected to a third coil of the motor, and a high-side switch and a low-side switch connected in series between the power supply terminal and the ground terminal; First to third half-bridges connected to the first to third motor terminals at respective connection points of the motor M and the low-side switch; A control unit for controlling the first through third half-bridge to drive a control method of the vehicle motor drive control device provided with,
The control unit includes:
In accordance with the phase of the motor, while switching between the control to turn off the high-side switch and the PWM control, switching between the control to turn on the low-side switch and the PWM control,
Further, during PWM control of the high-side switch, the low-side switch is PWM-controlled so that the high-side switch and the low-side switch are turned on / off complementarily. A method for controlling a motor drive control device for a vehicle, comprising controlling the first to third half bridges so as to energize.

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