JP2002027761A - Power output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electric motor from outputting unexpected torque at the start and to start quickly. SOLUTION: When a DC power supply 32 is connected by switching on a relay 34 at a start, transistors at the negative pole bus 28 of an inverter circuit 24 are switched on to form a short-circuit with regard to the phase of the minimum phase current of each of u, v, w phase currents. As for the other phases, a capacitor 30 is initially charged by repeating the process of forming a charging circuit by switching off the transistors at the negative pole bus 28 of the inverter circuit 24. Because the current increasing speed in the short- circuit is larger than that in the charging circuit, the current-increasing speed of each phase can be equalized by repeating the above process. Consequently, because the equalized current of each phase can be caused to flow, the output of the unexpected torque from a motor 22 can be prevented when the capacitor 30 is initially charged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a power output device.

[0002]

2. Description of the Related Art Conventionally, as a power output device of this type,
A proposal is provided that includes a capacitor connected to the positive and negative buses of the inverter circuit that applies a three-phase AC to the motor, and a DC power supply connected to the positive or negative bus of the inverter circuit and the neutral point of the motor. (For example, JP-A-10-337047 and JP-A-11-1).
No. 78114). In this device, a circuit composed of a coil of each phase of a motor and a switching element of each phase of an inverter is regarded as a step-up chopper circuit that boosts a voltage of a DC power supply and stores electric charge in a capacitor. And the motor is driven.
The drive control of the motor and the storage control of the capacitor are performed simultaneously by the switching operation of the switching element of the inverter circuit when applying a pseudo three-phase alternating current to the motor.

[0003]

However, in such a power output device, unexpected torque may be output from the electric motor at the time of starting. When the system stops,
From the viewpoints of durability, safety, and the like, it is general to discharge the capacitor so that the residual voltage does not act, and the power supply is also generally cut off. When a DC power supply is connected to start the above-described power output device in a state where the DC power supply is cut off in a state where the capacitor is discharged, the DC power supply is connected via a diode normally provided in each switching element of the inverter circuit. Thus, a circuit capable of charging a capacitor is formed, and a charging current flows. If the combined impedance of each phase of the motor and each phase of the inverter circuit completely match and the same current flows in each phase, no motor torque is output, but if the combined impedance does not match completely, Different currents flow through the motor, resulting in unexpected torque from the motor.

[0004] In addition, the discharge of the capacitor performed when the system is stopped is generally consumed by providing a discharge resistor in parallel with the capacitor. However, since power is consumed as heat, the energy of the entire apparatus is reduced. Efficiency is reduced.

[0005] It is an object of the power output apparatus of the present invention to prevent unexpected output of torque to a motor at the time of starting. Another object of the power output device of the present invention is to start quickly. Further, an object of the power output device of the present invention is to improve the energy efficiency of the device. Alternatively, the power output device of the present invention comprises:
Another object is to reduce the size and simplification of the device.

[0006]

Means for Solving the Problems and Their Functions and Effects The power output device of the present invention employs the following means in order to achieve at least a part of the above object.

A first power output device according to the present invention comprises: a power source;
A motor rotatably driven by a polyphase alternating current, an inverter circuit capable of supplying polyphase alternating current power to the motor by a switching operation of a plurality of switching elements, and one of a positive bus and a negative bus of the inverter circuit Connection means for connecting and disconnecting the power supply to and from the neutral point of the electric motor, chargeable / dischargeable power storage means connected to the positive and negative buses of the inverter circuit, and a start instruction has been given. In this case, the gist of the invention is to include a start-up control unit that connects the power supply by the connection unit after the start-up switching control is started for the plurality of switching elements of the inverter circuit.

In the first power output apparatus of the present invention, when a start instruction is issued, the start control means starts the start switching control for the plurality of switching elements of the inverter circuit, and then starts the power supply by the connection means. Connection. Therefore, the motor can be switched so that no torque is generated, so that an unexpected torque can be prevented from being output from the motor, and the motor can be started quickly.

A second power output device according to the present invention comprises: a power source;
A motor rotatably driven by a polyphase alternating current, an inverter circuit capable of supplying polyphase alternating current power to the motor by a switching operation of a plurality of switching elements, and one of a positive bus and a negative bus of the inverter circuit A connection means for connecting and disconnecting the power supply to and from the neutral point of the motor; and a bus which is not connected to the power supply by the connection means among the positive bus and the negative bus of the inverter circuit. Chargeable and dischargeable power storage means connected to the power point, and when a start instruction is given,
The gist of the present invention is to include a start-up control unit that performs the start-up switching control for the connection of the power supply by the connection unit and the plurality of switching elements of the inverter circuit.

In the second power output device of the present invention, when a start instruction is given, the connection of the power supply by the connection means and the start-time switching control for the plurality of switching elements of the inverter circuit are performed. Therefore, switching can be performed so that no torque is generated in the electric motor, so that unexpected torque can be prevented from being output from the electric motor, and the motor can be started quickly.

In the first or second power output apparatus of the present invention, the switching control at the time of starting may be control for switching the plurality of switching elements so that torque is not output from the electric motor. .

In the first or second power output apparatus of the present invention, the starting switching control is control for switching the plurality of switching elements so that currents flowing in respective phases of the motor become equal. It can also be. In the first or second power output apparatus according to the aspect of the present invention, each of the first and second power output devices includes a phase current detecting unit that detects a current of each phase of the electric motor, and the starting control unit includes:
The plurality of motors and the power supply form a short circuit until the low state is released for a phase having a low current value among the currents of the phases detected by the phase current detection means. The control for switching the switching elements may be performed as the start-time switching control.

[0013] A third power output device of the present invention comprises: a power source;
A motor rotatably driven by a polyphase alternating current, an inverter circuit capable of supplying polyphase alternating current power to the motor by a switching operation of a plurality of switching elements, and one of a positive bus and a negative bus of the inverter circuit Connection means for connecting and disconnecting the power supply to and from the neutral point of the electric motor, chargeable / dischargeable power storage means connected to the positive and negative buses of the inverter circuit, and power storage of the power storage means Power storage state detecting means for detecting a state, and when a stop instruction is given, disconnection of the power supply by the connection means and disconnection of the inverter circuit based on the power storage state of the power storage means detected by the power storage state detecting means. The gist of the present invention is to include a stop-time control unit that performs predetermined switching control on a plurality of switching elements.

In the third power output device of the present invention, when a stop instruction is given, the stop time control means connects the power supply by the connection means based on the state of charge of the power storage means detected by the state of charge detection means. And performs predetermined switching control on a plurality of switching elements of the inverter circuit. Therefore, according to the third power output device of the present invention, it is possible to perform a stop based on the state of power storage of the power storage means.

[0015] A fourth power output device of the present invention comprises: a power source;
A motor rotatably driven by a polyphase alternating current, an inverter circuit capable of supplying polyphase alternating current power to the motor by a switching operation of a plurality of switching elements, and one of a positive bus and a negative bus of the inverter circuit Connection means for connecting and disconnecting the power supply to and from the neutral point of the motor; and a bus between the positive and negative buses of the inverter circuit, to which the power supply is not connected by the connection means, and Charge and discharge power storage means connected to the power point, and when a stop instruction is given,
A stop-time control unit that performs disconnection of the power supply by the connection unit and performs predetermined switching control on a plurality of switching elements of the inverter circuit based on the storage state of the storage unit detected by the storage state detection unit. The point is to prepare.

In the fourth power output apparatus of the present invention, when a stop instruction is given, the stop-time control means connects the power supply by the connection means based on the state of charge of the power storage means detected by the state-of-charge detection means. And performs predetermined switching control on a plurality of switching elements of the inverter circuit. Therefore, according to the fourth power output apparatus of the present invention, it is possible to perform a stop based on the state of power storage of the power storage means.

In the third or fourth power output device according to the present invention, the stop-time control means may be configured to control the connection means when the power storage state of the power storage means is a state capable of applying a voltage higher than the voltage of the power supply. While the connection of the power supply is maintained, the first switching control is performed when the plurality of switching elements are switched so that the electric charge of the power storage means is supplied to the power supply side, and the power storage state of the power storage means is the voltage of the power supply. When a higher voltage cannot be applied, the connection means disconnects the power supply, and switches the plurality of switching elements so that current from the power storage means flows to each phase of the motor. It may be a means for performing switching control. By doing so, part of the electric charge stored in the power storage means can be returned to the power supply side, so that the energy efficiency of the device can be improved. In the third or fourth power output device according to the aspect of the present invention, in the first stop switching control and the second stop switching control, the plurality of switching elements are switched such that torque is not output from the electric motor. It can be control. In this way, it is possible to prevent an unexpected torque from being output from the electric motor.

[0018]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is a configuration diagram schematically showing the configuration of a power output device 20 according to one embodiment of the present invention. As shown, the power output device 20 of the embodiment includes a motor 22 that is rotationally driven by three-phase AC, an inverter circuit 24 that can convert DC power into three-phase AC power and supply the three-phase AC power to the motor 22, and an inverter circuit 24. And a capacitor 30 connected to the positive bus 26 and the negative bus 28 of the inverter circuit 24 and a neutral point of the negative bus 28 of the inverter circuit 24 and the neutral point of the motor 22.
A DC power supply 32 connected via the power supply 4 and an electronic control unit 40 for controlling the entire apparatus.

The motor 22 is configured as a synchronous generator motor capable of generating electric power, for example, comprising a rotor having a permanent magnet attached to the outer surface thereof and a stator having a three-phase coil wound thereon. The rotation shaft of the motor 22 is the output shaft of the power output device 20 according to the embodiment, and power is output from this rotation shaft. Since the motor 22 of the embodiment is configured as a generator motor, power can be generated by the motor 22 by inputting power to the rotating shaft of the motor 22. The DC power supply 32 is configured as, for example, a nickel-metal hydride or lithium-ion secondary battery.

The inverter circuit 24 includes six transistors T1 to T6 and six diodes D1 to D6. The six transistors T <b> 1 to T <b> 6 are arranged in pairs each of which is located on the source side and the sink side with respect to the positive electrode bus 26 and the negative electrode bus 28, respectively. Are connected. Therefore, the pair of transistors T1 in a state where a voltage is applied to the positive electrode bus 26 and the negative electrode bus 28
By controlling the ratio of the ON time to T6, a rotating magnetic field is formed by the three-phase coil of the motor 22, and the motor 22 can be driven to rotate.

The electronic control unit 40 is configured as a microprocessor mainly including a CPU 42, and includes a ROM 44 storing a processing program, a RAM 46 temporarily storing data, and an input / output port (not shown). Prepare. The electronic control unit 40 includes a motor 22
The current of each phase from the current sensors 52 to 56 attached to each phase of uvw of the three-phase coil, the neutral point current from the current sensor 58 attached to the neutral point of the motor 22, and the rotation axis of the motor 22 The rotation angle of the rotor of the motor 22 from the rotation angle sensor 60 attached to the motor, the terminal voltage Vc of the capacitor 30 from the voltage sensor 62 attached to the capacitor 30, the command value related to the operation of the motor 22, and the like are input ports. Have been entered through. Further, the electronic control unit 40 outputs the transistor T of the inverter circuit 24.
A control signal for performing switching control of 1 to T6, a drive signal to the actuator 35 of the relay 34, and the like are output via an output port.

Next, the operation of the power output apparatus 20 of the embodiment configured as described above, particularly, the operation at the time of starting will be described. FIG. 2 is a flowchart illustrating an example of a start-time processing routine executed by the electronic control unit 40 of the power output device 20 according to the embodiment at the time of start. This routine
This is executed when a start signal from a start switch (not shown) is input to the electronic control unit 40.

When the startup processing routine is executed, the CPU 42 of the electronic control unit 40 first executes processing for starting the inverter startup processing (step S10).
0). The inverter start-time processing is performed based on an inverter start-time processing routine illustrated in FIG. For easy explanation, a process at the time of starting the inverter will be described. The process at the time of starting the inverter is as follows.
The respective phase currents Iu, Iv, Iw detected by steps 56 to 56 are read (step S110), and the read phase currents I
The minimum phase current among u, Iv, and Iw is determined (step S112). Then, for the phase corresponding to the minimum phase current, the transistor of the inverter circuit 24 is switched to be a short circuit (step S114), and for the other phases, the transistor of the inverter circuit 24 is switched to be a charging circuit (step S114). Step S116),
This routine ends. FIG. 4 is a circuit diagram of the power output device 20 of the embodiment focusing on the leakage inductance of the three-phase coil (u-phase) of the motor 22. The short-circuit described above is a circuit formed by turning on the transistor T2 of the inverter circuit 24 when the u-phase is considered, and the charging circuit turns off the transistor T2 of the inverter circuit 24 in the figure. It is a circuit formed by the solid line arrow in the figure formed in the state described above. Since both the v-phase and the w-phase of the three-phase coil of the motor 22 are the same circuit as the u-phase, the state where the transistors T4 and T6 are turned on is a short-circuit circuit of the v-phase and the w-phase, and the transistors T4 and T6 are turned off. This state is the v-phase and w-phase charging circuits.

The operation of the circuit of FIG. 4 which constitutes such a short circuit and a charging circuit will be described. In the short circuit, the u-phase of the three-phase coil of the motor 22 functions as a reactor. When the transistor T2 is turned off from this short circuit state to form a charging circuit, the energy stored in the u-phase of the three-phase coil functioning as a reactor is stored in the capacitor 30.
Is stored in The voltage Vc of the capacitor 30 at this time
Can be higher than the supply voltage of the DC power supply 32. Therefore, this circuit can be regarded as a boost chopper circuit that boosts and stores the energy of the DC power supply 32 in the capacitor 30. Here, the rising speed of the current in the short circuit is determined by the voltage of the DC power supply 32 and the inductance of the winding of the motor 22. On the other hand, the rising speed of the current in the charging current is initially the same as the rising speed of the current of the short circuit, but the rising speed of the current decreases as the terminal voltage Vc of the capacitor 30 increases. Therefore, the inverter start-up processing routine illustrated in FIG. 3 uses a short circuit for the phase corresponding to the minimum phase current and a charging circuit for the other phases.
This is processing for making the rising speed of the current of the phase having the minimum phase current larger than the rising speed of the currents of the other phases. By repeatedly executing the processing routine at the time of starting the inverter, the current of each phase rises while showing substantially the same current value to charge the capacitor 30.

Returning to the start-time processing routine of FIG. 2, when the inverter start-time processing is started, the relay 34 is turned on (step S102), and the DC power supply 32 is connected to the negative bus 28 and the neutral point of the motor 22. . Before the relay 34 is turned on, each of the phase currents Iu, Iv, Iw has a value of 0.
Therefore, regardless of which phase is short-circuited or charged, the capacitor 30
Cannot be charged, and are in the same electrical state. When the relay 34 is turned on and the DC power supply 32 is connected, a value is generated in each phase current Iu, Iv, Iw, but the value is due to the difference in the rising speed due to the length of the winding of each phase and the contact resistance at the connection point. There are slight differences. Based on the difference between the respective phase currents Iu, Iv, Iw, the processing routine at the time of starting the inverter functions. As described above, the respective phase currents Iu, Iv, Iv, Iv, Iv, Iv, Iw is similarly increased. FIG. 5 illustrates how the phase current increases. In the figure, a straight line A indicates a change in the phase current with time in the short circuit, an actual broken line B indicates a change in the phase current with time due to the process at the time of starting the inverter, and a broken line C indicates a change with respect to the average time of the phase current.
As shown by the solid broken line B in the figure, the phase current repeats charging of the capacitor 30 by the charging circuit and rising of the rising speed by the short circuit, and rises while slightly increasing and decreasing the average rising speed (broken line C).

When the relay 34 is turned on, the voltage sensor 6
Then, the terminal voltage Vc of the capacitor 30 detected by the step 2 is read (step S104), and a process of waiting for the terminal voltage Vc to become equal to or higher than the threshold value Vr is executed (step S106). Here, the threshold value Vr is determined by the inverter circuit 24
And the voltage of the capacitor 30 in a state where the driving of the motor 22 can be started by the switching control of the transistors T1 to T6, and is set as a value between the supply voltage of the DC power supply 32 and a voltage approximately twice as high. When the voltage Vc between the terminals of the capacitor 30 becomes equal to or higher than the threshold value Vr, the process at the start of the inverter is stopped (step S108), and the process at the start is ended.

According to the power output apparatus 20 of the embodiment described above, the inverter circuit 24 by the inverter start processing is provided.
After the switching of the transistors T1 to T6 is started, the relay 34 is turned on to connect the DC power supply 32, so that the phase currents Iu, Iv, and Iw of the motor 22 are uniformly increased to perform the initial charging of the capacitor 30. it can. Since the phase currents Iu, Iv, Iw are evenly increased, no torque is generated in the motor 22. As a result, it is possible to prevent an unexpected torque from being generated in the motor 22.

Next, a process when the power output device 20 of the embodiment is stopped will be described. FIG. 6 is a flowchart illustrating an example of a stop-time processing routine executed by the electronic control unit 40 of the power output device 20 according to the embodiment at the time of a stop. This routine is executed when a stop signal from a stop switch (not shown) is input to the electronic control unit 40.

When the stop processing routine is executed, the CPU 42 of the electronic control unit 40
Then, the terminal voltage Vc of the capacitor 30 detected by the step 2 is read (step S200), and a process of comparing the read terminal voltage Vc with the voltage Vb at which the DC power supply 32 can be charged is executed (step S202). If the inter-terminal voltage Vc of the capacitor 30 is higher than the chargeable voltage Vb, a stop-time charging process of charging the DC power supply 32 using the potential of the capacitor 30 is performed (step S204).
It returns to step S200. The stop-time charging process is performed by the transistors T1, T
3, after turning on T5 and turning off the transistors T2, T4, T6 on the negative bus 28 side, the charging process at the time of stop illustrated in FIG. 7 is repeatedly executed. When the stop-time charging process routine is executed, the CPU 42 of the electronic control unit 40 determines the phase currents Iu, Iv, Iw detected by the current sensors 52 to 56.
(Step S220), and the phase currents Iu, I
The phase current of the maximum current among v and Iw is determined (step S222), and the transistor on the positive electrode bus 26 side is turned off for a predetermined time for the phase of the maximum phase current (step S222).
224). Here, the predetermined time is shorter than the interval at which the stop-time charging process routine is repeated. By repeating this routine, the phase currents Iu, Iv, Iw can be equalized. As a result, it is possible to prevent an unexpected torque from being output from the motor 22 during charging.

When the voltage Vc between the terminals of the capacitor 30 becomes equal to or lower than the chargeable voltage Vb, the relay 34 is turned off and the DC power supply 32 is cut off (step S206).
A stop discharge process is performed in which the electric charge remaining at 0 is consumed by the circuit resistance of the inverter circuit 24 and the winding resistance of the motor 22. This process is performed, for example, when transistors T1 to T6 are consumed by the circuit resistance of the inverter circuit 24.
Are repeatedly turned on and off to form a short circuit while controlling the current value, and are consumed as heat by the transistors T1 to T6. When consuming due to the winding resistance of the motor 22,
The transistors T1 to T6 of the inverter circuit 24 may be switched as the zero torque command. By setting the zero torque command, the respective phase currents Iu, Iv, Iw become equal, and it is possible to prevent an unexpected torque from being output from the motor 22 during discharging.

According to the power output device 20 of the embodiment described above, the DC power supply 32 is charged by using a part of the electric charge of the capacitor 30 when the power output device is stopped. As a result, the energy efficiency of the device can be improved. Also, part of the electric charge of the capacitor 30 is transferred to the circuit resistance of the inverter
When each phase current Iu, I
Since v and Iw are equalized, it is possible to prevent the motor 22 from outputting an unexpected torque.

In the power output device 20 of the embodiment, the DC power supply 32 is attached so that the negative bus 28 of the inverter circuit 24 and the neutral point of the motor 22 are connected via the relay 34. Bus 26 and motor 2
The DC power supply 32 may be attached to the two neutral points via the relay 34.

Further, in the power output device 20 of the embodiment, the capacitor 30 is attached so as to connect the positive bus 26 and the negative bus 28 of the inverter circuit 24. However, the power output device 20B of the modification shown in FIG. As described above, the capacitor 30B may be attached to connect the positive bus 26 of the inverter circuit 24 and the neutral point of the motor 22. FIG. 9 is a circuit diagram of a power output device 20B of a modified example focusing on the leakage inductance of the three-phase coil (u-phase) of the motor 22. In the power output device 20B of the modified example, considering the u phase, the short circuit is a circuit formed by turning on the transistor T2 of the inverter circuit 24 and indicated by a dashed arrow in the figure, and the charging circuit is an inverter circuit. 24 is a circuit formed by turning off the transistor T2 and indicated by a solid line arrow in the figure. Since both the v-phase and the w-phase of the three-phase coil of the motor 22 are the same circuit as the u-phase, the state where the transistors T4 and T6 are turned on is a short-circuit circuit of the v-phase and the w-phase, and the transistors T4 and T6 are turned off. This state is the v-phase and w-phase charging circuits. In the power output device 20B of this modification, when the relay 34 is turned on and the DC power supply 32 is connected, the transistors T2, T2
4 and T6 are off, no charging current flows and the capacitor 30 is immediately turned off as in the power output device 20 of the embodiment.
B does not start charging, but the capacitor 30
In order to avoid the need to initially charge B and to generate torque in the motor 22 during the charging, the power output device 20 of the embodiment is used.
The same startup processing as above is required. Specifically, the threshold V
Except that r is set to a value between 0 and a value close to the voltage of the DC power supply 32, the startup routine of FIG. 2 and the inverter startup routine of FIG. 3 can be used as they are. Therefore, the power output device 20B of the modified example can also have the effect of starting the power output device 20 of the embodiment, that is, the effect of preventing an unexpected torque from being generated in the motor 22 when the capacitor 30B is charged.
In the power output device 20 of the modified example, when stopped, the transistor T1 is turned on to form a short circuit in the capacitor 30B, and the three-phase coil functions as a reactor.
By turning off the transistor T1, the DC power supply 32 can be charged using the reactor energy.
At this time, if the minimum or maximum of each phase current Iu, Iv, Iw is determined and the transistors T1, T3, T5 are turned on / off, each phase current Iu, Iv, Iw can be equalized. The stop processing routine of FIG. 6 and the stop charging routine of FIG. 7 can be used as they are even in the power output device 20B. Therefore, the power output device 20 </ b> B of the modified example also has the effect of stopping the power output device 20 of the embodiment, that is, the effect of improving the energy efficiency of the device and the effect of preventing the occurrence of unexpected torque in the motor 22. Can be.

In the power output device 20B of the modified example, a capacitor 30B is attached so as to connect the positive bus 26 of the inverter circuit 24 to the neutral point of the motor 22, and the negative bus 28 of the inverter circuit 24 and the neutral point of the motor 22 are connected. Is connected via a relay 34, but the DC power supply 32 is connected via a relay 34 to the positive bus 26 of the inverter circuit 24 and the neutral point of the motor 22. A capacitor 30 is connected to connect the negative bus 28 and the neutral point of the motor 22.
B may be attached.

In the power output device 20 of the embodiment and its modified example, the process of setting the phase of the minimum phase current to the short circuit and setting the other phase to the charging circuit is repeatedly executed, whereby each phase current Iu, Although Iv and Iw are uniformly increased, each phase current Iu, Iv, Iw is equalized by repeating the process of setting the phase of the maximum phase current to the charging circuit and setting the other phases to the short circuit. May be raised. Power output device 20 of embodiment
This is because, although the charging of the capacitors 30 and 30B requires more time, the phase current of the motor 22 can be increased uniformly.

In the power output device 20 of the embodiment and its modification, a synchronous generator motor driven by three-phase AC is used as the motor 22, but any type of motor driven by polyphase AC may be used.

Although the embodiments of the present invention have been described with reference to the embodiments, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the scope of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically illustrating a configuration of a power output device 20 according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of a startup processing routine executed by an electronic control unit 40 of the power output apparatus 20 according to the embodiment.

FIG. 3 is a flowchart illustrating an example of an inverter start-time processing routine executed by an electronic control unit 40 of the power output device 20 according to the embodiment.

FIG. 4 is a circuit diagram of a power output device 20 of the embodiment focusing on a leakage inductance of a three-phase coil (u-phase) of a motor 22.

FIG. 5 is an explanatory view exemplifying how a phase current rises.

FIG. 6 is a flowchart illustrating an example of a stop processing routine executed by the electronic control unit 40 of the power output device 20 according to the embodiment.

FIG. 7 is a flowchart illustrating an example of a stop-time charging process routine executed by the electronic control unit 40 of the power output device 20 according to the embodiment.

FIG. 8 is a configuration diagram schematically showing a configuration of a power output device 20B according to a modification.

FIG. 9 is a circuit diagram of a power output device 20B of a modified example focusing on leakage inductance of a three-phase coil (u-phase) of the motor 22.

[Explanation of symbols]

20, 20B power output device, 22 motor, 24 inverter circuit, 26 positive electrode bus, 28 negative electrode bus, 30,
30B capacitor, 32 DC power supply, 34 relays, 3
5 actuator, 40 electronic control unit, 42
CPU, 44 ROM, 46 RAM, 52 to 58 current sensor, 60 rotation angle sensor, 62 voltage sensor, T
1 to T6 transistors, D1 to D6 diodes.

Continued on the front page (72) Inventor Shoichi Sasaki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Junwa 1 Toyota Town Toyota City, Aichi Prefecture Toyota Motor Corporation ( 72) Inventor Kazunari Moriya 41, Nagakute-cho Yokomichi, Nagakute-cho, Aichi-gun, Japan 1 within Toyota Central Research Laboratory Co., Ltd. Inside Toyota Central Research Laboratory Co., Ltd. (72) Inventor Yukio Inaguma 41-1, Oku-cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi F-term in Toyota Central Research Laboratory Co., Ltd. 5H007 AA06 BB06 CA01 CB02 CB05 CC12 CC23 DA03 DA06 DB12 DB13 DC02 DC05 DC07 GA01 GA08 5H560 BB04 BB12 DC12 DC13 EB01 SS02 TT12 TT15 UA06 XA02 XA03 XA05 5H576 BB02 BB03 BB04 CC04 DD02 DD07 FF01 FF05 HA03 HB02 JJ03 JJ17 LL22 LL24 LL41

Claims (9)

[Claims] A power supply; a motor rotatably driven by a polyphase AC; an inverter circuit capable of supplying polyphase AC power to the motor by switching operation of a plurality of switching elements; a positive bus and a negative bus of the inverter circuit. Connecting means for connecting and disconnecting the power supply to and from one of the buses and the neutral point of the motor; and a chargeable / dischargeable storage connected to the positive and negative buses of the inverter circuit. A power output device comprising: a start-up control unit configured to start the start-time switching control for the plurality of switching elements of the inverter circuit when a start instruction is issued, and then to connect the power supply by the connection unit. 2. A power supply, a motor rotatably driven by a polyphase AC, an inverter circuit capable of supplying polyphase AC power to the motor by switching operation of a plurality of switching elements, and a positive bus and a negative bus of the inverter circuit. Connection means for connecting and disconnecting the power supply to and from one of the buses and the neutral point of the motor; and the power supply being connected by the connection means among the positive and negative buses of the inverter circuit. Chargeable / dischargeable power storage means connected to an unconnected bus and a neutral point of the motor; when a start instruction is given, connection of the power supply by the connection means and start-up of a plurality of switching elements of the inverter circuit. A power output device comprising: a start-time control unit that performs switching control. 3. The power output device according to claim 1, wherein the start-time switching control is control for switching the plurality of switching elements so that torque is not output from the electric motor. 4. The switching control at the time of starting is a control of switching the plurality of switching elements so that currents flowing in respective phases of the motor become equal.
4. The power output device according to any one of claims 3 to 3. 5. The power output apparatus according to claim 4, further comprising: a phase current detecting means for detecting a current of each phase of the electric motor, wherein the starting control means detects the current by each phase current detecting means. Controlling the switching of the plurality of switching elements so that the electric motor and the power supply form a short circuit until the low state is released from the low current state phase among the currents of the respective phases. A power output device which is a means for performing switching control at the time of starting. 6. A power supply, a motor rotatably driven by a polyphase AC, an inverter circuit capable of supplying polyphase AC power to the motor by switching operations of a plurality of switching elements, a positive bus and a negative bus of the inverter circuit. Connecting means for connecting and disconnecting the power supply to and from one of the buses and the neutral point of the motor; and a chargeable / dischargeable storage connected to the positive and negative buses of the inverter circuit. Means, a power storage state detecting means for detecting a power storage state of the power storage means, and when a stop instruction is issued, the power supply by the connection means based on the power storage state of the power storage means detected by the power storage state detecting means. An operation comprising disconnection control and stop-time control means for performing predetermined switching control on a plurality of switching elements of the inverter circuit. Power output device. 7. A power supply, a motor rotatably driven by polyphase alternating current, an inverter circuit capable of supplying polyphase alternating current power to the motor by switching operations of a plurality of switching elements, a positive bus and a negative bus of the inverter circuit. Connection means for connecting and disconnecting the power supply to and from one of the buses and the neutral point of the motor; and the power supply being connected by the connection means among the positive and negative buses of the inverter circuit. Chargeable / dischargeable power storage means connected to the unconnected bus and the neutral point of the electric motor; and a connection based on a power storage state of the power storage means detected by the power storage state detection means when a stop instruction is given. Means for disconnecting the power supply and stopping predetermined switching control for a plurality of switching elements of the inverter circuit. Power output apparatus and a control unit. 8. The stop-time control means holds the connection of the power supply by the connection means when the storage state of the power storage means is a state in which a voltage higher than the voltage of the power supply can be applied, and controls the charge of the power storage means. Performs a first switching control at the time of stoppage of switching the plurality of switching elements so as to be supplied to the power supply side, and when the storage state of the power storage means is a state in which a voltage higher than the voltage of the power supply cannot be applied, the connection means 8. A means for disconnecting the power supply and performing second switching control at the time of stoppage for switching the plurality of switching elements so that current from the power storage means flows to each phase of the motor. Power output device. 9. The power output apparatus according to claim 8, wherein the first stop-time switching control and the second stop-time switching control are controls for switching the plurality of switching elements so that torque is not output from the electric motor.