JP2004112970A - Inverter apparatus for driving motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter apparatus for driving motors, wherein increase in the number of parts of an inverter circuit is minimized, and further a plurality of motors can be selectively driven. <P>SOLUTION: When an engine is started or the vehicle is running, a motor ECU 7 controls the gate terminals of IGBT (insulated gate bipolar transister)s via a gate drive circuit 6. Thereby, continuity is provided between the collector terminals and the emitter terminals of IGBTs 1c, 1f, and 1i. Further, continuity and breaking are repeatedly provided between the collector terminals and the emitter terminals of IGBTs 1a, 1b, 1d, 1e, 1g, and 1h. Thus, only a motor 5a for driving and causing the vehicle to run is rotated. When the vehicle is stopped, the motor ECU 7 provides continuity between the collector terminals and the emitter terminals of IGBTs 1a, 1d, and 1g and further repeatedly provides and interrupts continuity between the collector terminals and the emitter terminals of IGBTs 1b, 1c, 1e, 1f, 1h, and 1i via the gate drive circuit 6. Thus, only a motor 5b is rotated for actuating an air conditioner. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor driving inverter device provided with an inverter circuit for driving a motor.
[0002]
[Prior art]
Conventionally, when a plurality of motors are driven by the same power supply, an inverter circuit for driving each motor is provided independently, and power supplied from one power supply is supplied to each inverter circuit in parallel. (See, for example, Patent Document 1 or Patent Document 2).
[0003]
[Patent Document 1]
JP-A-09-308266 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-31482
[Problems to be solved by the invention]
However, when an inverter circuit is provided independently for each of a plurality of motors as in the related art, components that constitute the inverter circuit, such as switching elements using expensive semiconductor elements, are required as many as the number of inverter circuits. There are problems that the number of components in the entire circuit increases, the cost of the device increases, and the device needs to be increased in size due to an increase in circuit scale.
[0005]
The present invention has been made in view of the above problem, and has a motor drive inverter device including a control circuit capable of selectively driving a plurality of motors while minimizing an increase in the number of parts of the inverter circuit. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a motor driving inverter device according to the first aspect of the present invention is configured such that, for three switching elements, all two terminals of the switching elements that are turned on or off by external switching control are connected in series. To form a series circuit in which the switching elements are arranged in three stages, and furthermore, three series circuits are connected in parallel, and the switching elements are arranged in three stages and three rows. The three control terminals are respectively connected to the connection points of the IGBTs 1a to 1i and the flywheel diodes 3a to 3i) and the first and second switching elements of each column of the triple bridge inverter circuit. Three-phase control first motor (for example, the motor 5a of the embodiment) and the triple bridge inverter A three-phase control second motor (for example, the motor 5b of the embodiment) in which three control terminals are respectively connected to connection points of the second and third switching elements in each row of the road; Conducting between the two terminals of the third-stage switching element of each column of the triple bridge inverter circuit and repeating conduction and interruption between the two terminals of the first-stage and second-stage switching elements, A first motor driving means (for example, steps S1 and S6 in the embodiment) for driving and controlling the first motor is connected to the two terminals of the first-stage switching element of each column of the triple bridge inverter circuit. A second motor driving means (e.g., a second motor driving means for controlling the driving of the second motor by repeating conduction and interruption between the two terminals of the switching element in the second and third stages while conducting the conduction. Characterized by comprising a step S4) of the embodiment.
[0007]
In the motor driving inverter device having the above configuration, the first motor driving means conducts between the two terminals of the third-stage switching element of each column of the triple bridge inverter circuit and the first and second stages. By repeating conduction and cutoff between the two terminals of the eye switching element, a bridge circuit composed of six switching elements is equivalently configured, and only the first motor can be drive-controlled. Further, the second motor driving means conducts between the two terminals of the first-stage switching elements of each column of the triple bridge inverter circuit and establishes conduction between the two terminals of the second- and third-stage switching elements. By repeating the cutoff, a bridge circuit composed of six switching elements is equivalently configured, and only the second motor can be drive-controlled.
[0008]
A motor driving inverter according to a second aspect of the present invention is the motor driving inverter according to the first aspect, wherein the first motor is configured to drive or auxiliary drive the vehicle or to drive the engine of the vehicle. When the motor for starting, the second motor is a motor for driving a vehicle accessory mounted on the vehicle, when driving the vehicle or auxiliary driving, or when the engine When starting the vehicle, the first motor drive means controls the drive of the first motor, and when using the vehicle accessory when the vehicle stops running, the second motor drive means controls the The driving of the second motor is controlled.
[0009]
In the motor driving inverter device having the above configuration, the first motor is a motor for driving or auxiliary driving the vehicle or starting the engine of the vehicle, and the second motor is mounted on the vehicle. When the motor is used to drive the auxiliary equipment for the vehicle, when the vehicle is driven for driving or auxiliary driving, or when the engine is started, the first motor driving means uses a triple bridge inverter circuit. Thus, the vehicle can be moved by controlling only the driving of the first motor. Further, when using the vehicle accessory when the vehicle stops running, the second motor drive means drives and controls only the second motor using the triple bridge inverter circuit to operate the vehicle accessory. be able to.
[0010]
A motor driving inverter according to a third aspect of the present invention is the motor driving inverter according to the first aspect, wherein the second motor is configured to drive or auxiliary drive a vehicle or to drive an engine of the vehicle. When the first motor is a motor for driving a vehicle accessory mounted on the vehicle, the first motor is used for driving or auxiliary driving of the vehicle, or the engine is used for starting. When starting the vehicle, the second motor drive means controls the drive of the second motor, and when using the vehicle accessory when the vehicle stops running, the first motor drive means The driving of the first motor is controlled.
[0011]
In the motor driving inverter device having the above configuration, the second motor is a motor for driving or auxiliary driving the vehicle or starting the engine of the vehicle, and the first motor is mounted on the vehicle. When the motor is used to drive the auxiliary equipment for the vehicle, when driving the vehicle for driving or auxiliary driving, or when starting the engine, the second motor driving means uses a triple bridge inverter circuit. Thus, the vehicle can be moved by controlling only the driving of the second motor. When the vehicle auxiliary equipment is used when the traveling of the vehicle is stopped, the first motor driving means drives and controls only the first motor to operate the vehicle auxiliary equipment using the triple bridge inverter circuit. be able to.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram showing an inverter device for driving a motor according to an embodiment of the present invention.
In the motor driving inverter device of FIG. 1, the following bridge circuit is configured using, for example, an IGBT (Insulated Gate Bipolar Transistor) as a switching element. . That is, two terminals that are turned on or off by switching control of three IGBTs are all connected in series to form a series circuit in which IGBTs are arranged in three stages, and three series circuits are further connected in parallel. Thus, a triple bridge inverter circuit in which IGBTs are arranged in three rows and three rows is configured.
Specifically, as shown in FIG. 1, first, a source terminal of the IGBT 1a and a drain terminal of the IGBT 1b, and a source terminal of the IGBT 1b and a drain terminal of the IGBT 1c are connected to form a three-stage IGBT series circuit. The drain terminal of the IGBT 1a is connected to the positive terminal of the DC power supply 2, and the source terminal of the IGBT 1c is connected to the negative terminal of the DC power supply 2.
[0013]
Further, IGBTs 1d-1f and IGBTs 1g-1i having source and drain terminals connected in the same manner as IGBTs 1a-1c are connected in parallel with IGBTs 1a-1c at both ends of DC power supply 2, and IGBTs are arranged in three rows and three rows. A triple-bridge inverter circuit is constructed.
A flywheel diode having a cathode terminal connected to the source terminal and an anode terminal connected to the drain terminal is connected between the source terminal and the drain terminal of each of the nine IGBTs 1a to 1i of the motor driving inverter device according to the present embodiment. (Free Wheeling Diode) 3 a to 3 i are provided, and a smoothing capacitor 4 is connected between the positive terminal and the negative terminal of the DC power supply 2.
[0014]
On the other hand, in the motor driving inverter device of the present embodiment, the IGBT 1a and IGBT 1b, IGBT 1d and IGBT 1e, IGBT 1g arranged in the first and second stages of each column of the triple bridge inverter circuit composed of IGBTs 1a to 1i are provided. A three-phase control motor 5a to which each of the three-phase control terminals is connected is provided at a connection point between the motor and the IGBT 1h. Similarly, the connection points of IGBT1b and IGBT1c, IGBT1e and IGBT1f, IGBT1h and IGBT1i arranged at the second and third stages of each column of the triple bridge inverter circuit composed of IGBT1a to 1i, A three-phase control motor 5b to which each of the phase control terminals is connected is provided.
[0015]
Further, the motor driving inverter device of the present embodiment includes a gate driving circuit 6 for driving the gate terminals of the IGBTs 1a to 1i of the triple bridge inverter circuit, and a control signal for controlling the motors 5a and 5b. The gate drive circuit 6 drives the gate terminals of the IGBTs 1a to 1i and controls conduction and cutoff between the drain terminal and the source terminal in accordance with an instruction of a drive control signal supplied from a motor ECU (Electronic Control Unit) 7 that generates .
The element used as the switching element is not limited to the IGBT, but may be a reverse blocking thyristor, a GTO (Gate Turn Off thyristor), a bipolar transistor, a MOSFET, or the like.
Further, motor ECU 7 may be realized as a part of another ECU mounted on the vehicle.
[0016]
Next, the operation of the motor driving inverter device of the present embodiment will be described with reference to the drawings. The motors 5a and 5b described in the present embodiment are, for example, a motor for driving or auxiliary driving of a vehicle, a motor for starting an engine of a vehicle, and a vehicle auxiliary device mounted on a vehicle. Here, as an example, the operation of the motor driving inverter device when the motor 5a is a drive motor for a hybrid vehicle and the motor 5b is a motor for an electric air conditioner will be described.
FIG. 2 is a flowchart for explaining the operation of the motor driving inverter device of the present embodiment.
[0017]
2, first, in the engine start mode M1, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1c, 1f, and 1i via the gate drive circuit 6 to cause each of the drain terminals and the source terminals of the IGBTs 1c, 1f, and 1i. The IGBTs 1a, 1b, 1d, 1e, 1g, and 1h are applied with a pulsed voltage to each of the gate terminals of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h. By repeating conduction and cutoff between the terminals and performing three-phase drive control of the motor 5a, the motor 5a for driving the vehicle to run is rotated (step S1).
[0018]
When the vehicle starts running, the mode shifts to the drive / regeneration mode M2. In the drive / regeneration mode M2, the three-phase drive control of the motor 5a, the drain terminals of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h and the source are performed. The regenerative control for charging the DC power supply 2 using the electric power generated by the rotation of the motor 5a by the current flowing between the terminals and the flywheel diodes 3a, 3b, 3d, 3e, 3g, 3h is performed (step S2). .
At this time, the equivalent circuit of the motor driving inverter device of the present embodiment is a circuit as shown in FIG.
[0019]
That is, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1c, 1f, and 1i via the gate drive circuit 6 to conduct between the drain terminals and the source terminals of the IGBTs 1c, 1f, and 1i, thereby equivalently. Then, all the three-phase control terminals of the motor 5b are connected to the negative terminal of the DC power supply 2, and all the three-phase control terminals have the same potential, so that no current flows through the motor 5b. Therefore, at this time, the motor driving inverter device of the present embodiment uses only the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h and the flywheel diodes 3a, 3b, 3d, 3e, 3g, and 3h. Drive control of only 5a can be performed.
[0020]
On the other hand, when the vehicle stops, the idling stop mechanism causes the motor ECU 7 to control the motor 5a that conducts and cuts off the connection between the drain terminals and the source terminals of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h via the gate drive circuit 6. Is stopped to stop the motor 5a (step S3), and the mode shifts to the air conditioner motor control mode M3.
[0021]
In the air conditioner motor control mode M3, contrary to step S1, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1a, 1d, and 1g via the gate drive circuit 6 to cause each of the drain terminals of the IGBTs 1a, 1d, and 1g. And a source terminal, and applying a pulse-like voltage to each of the gate terminals of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i, thereby draining each of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i. The motor 5b for operating the air conditioner is rotated by repeating the conduction and cutoff between the terminal and the source terminal and performing three-phase drive control of the motor 5b (step S4).
At this time, the equivalent circuit of the motor driving inverter device of the present embodiment is a circuit as shown in FIG.
[0022]
That is, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1a, 1d, and 1g via the gate drive circuit 6 to conduct between the drain terminals and the source terminals of the IGBTs 1a, 1d, and 1g, thereby equivalently. Then, all the three-phase control terminals of the motor 5a are connected to the positive terminal of the DC power supply 2, and all the three-phase control terminals have the same potential, so that no current flows through the motor 5a. For this reason, the motor driving inverter device of the present embodiment uses the IGBTs 1b, 1c, 1e, 1f, 1h, 1i and the flywheel diodes 3b, 3c, 3e, 3f, 3h, 3i only at this time. Only the drive can be controlled.
[0023]
When the vehicle starts running again, the motor ECU 7 controls the motor that conducts and cuts off between the drain terminals and the source terminals of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i via the gate drive circuit 6. The three-phase drive control of the motor 5b is stopped to stop the motor 5b (step S5), and the process shifts to the engine start mode M4.
Then, as in step S1, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1c, 1f, and 1i via the gate drive circuit 6 to conduct between the drain terminals and the source terminals of the IGBTs 1c, 1f, and 1i. At the same time, by applying a pulsed voltage to each of the gate terminals of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h, a voltage between the drain terminals and the source terminals of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h is increased. By repeating the conduction and interruption and performing three-phase drive control of the motor 5a, the motor 5a for driving the vehicle is rotated (step S6).
[0024]
Thereafter, by repeating the above operation (mode M5), the motor 5a is driven to drive the vehicle while the vehicle is running, and the motor 5b is driven when the vehicle is stopped. And then repeat the operation of operating the air conditioner.
[0025]
Next, referring to the drawings, the current flowing through the motor when the motor driving inverter device of the present embodiment is operated according to the above-described flowchart will be described with reference to FIG. During the engine start and the drive / regeneration control by the motor ECU 7, the current does not flow through the motor 5b, and the current flows only through the motor 5a. On the other hand, during operation of the air conditioner when the engine is stopped, current does not flow through the motor 5a, and current flows only through the motor 5b.
As described above, the motor driving inverter device according to the present embodiment alternately drives two motors using nine switching elements.
[0026]
In the above-described embodiment, the operation of the motor drive inverter device in the case where the motor 5a is a drive motor for a hybrid vehicle and the motor 5b is a motor for an electric air conditioner has been described. The motor 5b may be, for example, a motor for driving or auxiliary driving the vehicle, or a motor for starting an engine of the vehicle, and the motor 5a may be a motor for driving a vehicle accessory mounted on the vehicle.
In this case, the control of the conduction / interruption of the IGBTs 1a to 1i described in the above-described embodiment is completely opposite to that described above, and when starting the engine and running the vehicle, the motor ECU 7 is controlled via the gate drive circuit 6. , IGBTs 1a, 1d, and 1g, a voltage is applied to each of the drain terminals and the source terminals of the IGBTs 1a, 1d, and 1g, and a voltage is applied to each of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i. On the other hand, by applying a pulse-like voltage, conduction and cutoff between each drain terminal and source terminal of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i are repeated, and three-phase drive control of the motor 5b is performed. Shall be rotated.
[0027]
When driving the vehicle accessory mounted on the vehicle while the vehicle is stopped, the motor ECU 7 applies a voltage to each of the gate terminals of the IGBTs 1c, 1f, and 1i via the gate drive circuit 6 to drive the IGBT 1c. , 1f, 1i, and between the drain terminal and the source terminal, and by applying a pulsed voltage to each gate terminal of the IGBTs 1a, 1b, 1d, 1e, 1g, 1h, the IGBTs 1a, 1b, 1d, The motor 5a is rotated by repeating three-phase drive control of the motor 5a by repeating conduction and cutoff between the drain terminals 1e, 1g, and 1h and the source terminal.
[0028]
Further, in the present embodiment, the motor ECU 7 constitutes a first motor driving unit and a second motor driving unit. More specifically, steps S1 and S6 in FIG. 2 correspond to first motor driving means, and step S4 in FIG. 2 corresponds to second motor driving means.
[0029]
As described above, in the motor drive inverter device according to the present embodiment, when the engine is started or the vehicle is running, the motor ECU 7 controls the gate terminals of the IGBTs via the gate drive circuit 6, and the IGBTs 1c, A motor for driving the vehicle while conducting between the drain terminal and the source terminal of each of the IGBTs 1a, 1b, 1d, 1e, 1g, and 1h while repeating conduction and interruption between the drain terminal and the source terminal of the IGBTs 1f and 1i. Rotate only 5a. On the other hand, when the vehicle stops, the motor ECU 7 causes the drain terminals and the source terminals of the IGBTs 1a, 1d, and 1g to conduct between the drain terminals and the source terminals of the IGBTs 1b, 1c, 1e, 1f, 1h, and 1i via the gate drive circuit 6. The conduction and cutoff between the drain terminal and the source terminal are repeated, and only the motor 5b for operating the air conditioner is rotated.
[0030]
As a result, the two motors 5a and 5b can be driven by a smaller number of IGBTs (switching elements) than when the motors 5a and 5b are independently provided with inverter circuits and driven. Therefore, it is possible to reduce the cost for configuring the motor driving inverter device and reduce the device scale.
[0031]
【The invention's effect】
As described above, according to the motor driving inverter device of the first aspect, the first motor driving means conducts between the two terminals of the third-stage switching element in each column of the triple bridge inverter circuit, By repeating conduction and cutoff between the two terminals of the first-stage and second-stage switching elements, only the first motor is drive-controlled. Conversely, the second motor drive means is provided for each column of the triple bridge inverter circuit. By conducting between the two terminals of the first-stage switching element and repeating conduction and interruption between the two terminals of the second and third-stage switching elements, only the second motor can be drive-controlled. .
[0032]
Therefore, two motors can be driven by a smaller number of switching elements as compared with the case where the first and second motors are independently provided with inverter circuits, and the motor driving inverter device is used. And the size of the apparatus can be reduced.
[0033]
According to the inverter device for driving a motor according to claim 2, the first motor is a motor for driving or auxiliary driving the vehicle or starting the engine of the vehicle, and the second motor is a vehicle. When the motor is used to drive vehicle auxiliary equipment mounted on the vehicle, the first motor driving means is used only when the first motor driving means is used when driving the vehicle for driving or auxiliary driving, or when starting the engine. Drive control. When the vehicle auxiliary machine is used when the vehicle stops running, the second motor drive means controls only the second motor. On the other hand, according to the motor drive inverter device of the third aspect, the second motor is a motor for driving or auxiliary driving the vehicle or starting the engine of the vehicle, and the first motor is used for the first motor. When the motor is used to drive the vehicle accessory mounted on the vehicle, the opposite is true.
[0034]
Therefore, one of the two motors is used to drive or auxiliary drive the vehicle, or as a motor for starting the engine of the vehicle, and the other motor is used to drive vehicle accessories mounted on the vehicle. When a motor is used, two motors are alternately driven in accordance with the purpose of use of the motors, so that a part of an inverter circuit for driving the motors is shared to configure a motor driving inverter device. And the effect that the vehicle can travel efficiently can be obtained.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a motor driving inverter device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an operation of the motor driving inverter device of the embodiment.
FIG. 3 is an equivalent circuit at the time of operation of the motor driving inverter device of the embodiment.
FIG. 4 is an equivalent circuit at the time of operation of the motor driving inverter device of the embodiment.
FIG. 5 is a waveform diagram showing a phase current of the motor when the motor driving inverter device of the embodiment is operated.
[Explanation of symbols]
1a-1i IGBT (triple bridge inverter circuit)
3a-3i Flywheel diode (triple bridge inverter circuit)
5a motor (first motor)
5b motor (second motor)
6 Gate drive circuit 7 Motor ECU
S1, S6 First motor driving means S4 Second motor driving means

Claims (3)

With respect to the three switching elements, all two terminals of the switching elements that are turned on or off by external switching control are connected in series to form a series circuit in which the switching elements are arranged in three stages. A triple bridge inverter circuit in which three circuits are connected in parallel, and the switching elements are arranged in three stages and three rows;
A first motor of three-phase control in which three control terminals are respectively connected to a connection point of the switching elements in the first and second stages of each column of the triple bridge inverter circuit;
A second motor of three-phase control in which three control terminals are respectively connected to connection points of the switching elements in the second and third stages of each column of the triple bridge inverter circuit;
Conducting between the two terminals of the third-stage switching element of each column of the triple bridge inverter circuit and repeating conduction and interruption between the two terminals of the first-stage and second-stage switching elements, First motor driving means for driving and controlling the first motor;
While conducting between the two terminals of the first-stage switching element of each column of the triple bridge inverter circuit, repeating conduction and interruption between the two terminals of the second-stage and third-stage switching elements, And a second motor driving means for controlling the driving of the second motor. The first motor is a motor for driving or assisting driving of the vehicle or for starting an engine of the vehicle, and the second motor is used for driving a vehicle accessory mounted on the vehicle. When the vehicle is driven for driving or auxiliary driving, or when the engine is started, the first motor driving means controls the driving of the first motor, 2. The motor drive inverter device according to claim 1, wherein the second motor drive unit controls the drive of the second motor when the vehicle accessory is used when the vehicle stops running. 3. The second motor is a motor for driving or auxiliary driving the vehicle, or for starting an engine of the vehicle, and the first motor is used for driving a vehicle accessory mounted on the vehicle. When the vehicle is driven for driving or auxiliary driving, or when starting the engine, the second motor drive means controls the driving of the second motor, 2. The motor drive inverter device according to claim 1, wherein the first motor drive unit controls the drive of the first motor when the vehicle auxiliary device is used when the vehicle stops running. 3.

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