JPH10225014A - Motor control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply power efficiently from a battery provided on an electric vehicle to a commercial power side, when the commercial power failed. SOLUTION: A switching circuit 14 is provided parallel to an inverter 12 connected to a main battery 10 provided on a vehicle. When detecting a commercial power failure, a controller 20 controls by PWM the switching transistors 1a to 3b of the inverter 12 and controls the on-off of the switching transistor 4a, 4b of the switching circuit 14, to cause the same current of the same phase to flow in each phase of a motor 16 and thereby to supply power to the commercial power side. No torque is generated in the motor 16 because of the same current of the same phase, which enables efficiently to supply power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device, and more particularly to a device for supplying electric power from a vehicle battery to a commercial power supply.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a technique of supplying power from a vehicle-mounted battery of an electric vehicle at the time of a power failure on the commercial power supply side. For example, JP-A-6-292304 discloses that
It describes that electric power is supplied from a vehicle-mounted battery to a commercial power supply side using a power conversion unit (inverter) as a charger for charging. Specifically, a changeover switch for connecting the AC motor to the commercial power supply is provided, and when the commercial power supply fails, this changeover switch is connected to the commercial power supply so that the vehicle battery → inverter → AC motor → changeover switch → commercial power supply. To supply power.

[0003]

However, when a permanent magnet motor or the like is used as the AC motor, a motor torque is generated while supplying electric power to the commercial power supply depending on the position of the rotor, and the vehicle unexpectedly moves. Therefore, there is a problem that it is necessary to lock the electric vehicle with a brake. In addition, the generation of such extra torque has caused a reduction in power supply efficiency. The present invention has been made in view of the above-mentioned problems of the related art, and an object thereof is to provide an unnecessary torque in a motor when power is supplied from a vehicle-mounted battery via a motor during a commercial power failure. An object of the present invention is to provide a motor control device capable of efficiently supplying power.

[0004]

To achieve the above object, a first aspect of the present invention uses power conversion means for supplying on-vehicle battery power to a motor. A motor control device for supplying to a commercial power supply, characterized by comprising control means for supplying the same current in the same phase to each phase of the motor. Also,
In a second aspect based on the first aspect, the control means includes:
Switching means connected in parallel with the power conversion means to the vehicle-mounted battery; voltage detection means for detecting a voltage supplied to the commercial power supply; and It is characterized by having a voltage feedback means for opening / closing control in conjunction with each switch and the switching means.

In a third aspect based on the first aspect, the control means is supplied to a switching means connected in parallel with the power conversion means to the vehicle-mounted battery and to the commercial power supply. Current detection means for detecting a current, a voltage of the commercial power supply is calculated based on the detected current, and opening and closing control is performed by interlocking each switch and the switching means in the power conversion means based on the calculated voltage. And voltage feedback means.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 is a circuit diagram of the first embodiment. An inverter 12 as power conversion means is connected to a main battery 10 mounted on the electric vehicle, and each switching transistor 1a, 1b, 2a, 2b, 3a, 3b in the inverter 12 is connected.
Are sequentially controlled to output a three-phase alternating current. A permanent magnet motor 16 is connected to the inverter 12, and three-phase (U-phase, V-phase, and W-phase) currents (Iu,
Iv, Iw) are supplied to the star-connected stator coils.
The connection between the in-vehicle main battery 10 and the inverter 12 and the connection between the inverter 12 and the motor 16 are the same as in a conventional electric vehicle.

On the other hand, in the present embodiment, the main battery 1
Switching circuit 1 in parallel with inverter 12 for 0
4 are connected. The switching circuit 14 includes switching transistors 4a and 4b and a diode, and has the same circuit configuration as one phase of the inverter. When the commercial power supply fails, the motor 16 and the connector 17 on the commercial power supply side are connected, and the connector 17 and the switching circuit 14 are connected. A voltage sensor 18 for detecting a voltage on the commercial power supply side is connected, and the detected voltage Vac is supplied to a controller 20. The controller 20 further supplies a commercial power to a predetermined voltage (1
00V) is connected, and the user turns on the request switch 22
Then, the controller 20 controls the switching transistors 1a to 3b of the inverter 12 and the switching transistors 4a and 4b of the switching circuit 14 to open and close in conjunction with each other based on the voltage detected by the voltage sensor 18,
Perform voltage feedback control.

FIG. 2 is a timing chart showing a specific example of the opening / closing control by the controller 20.
The purpose of the opening / closing control of the controller 20 is to make the currents Iu, Iv, Iw of the respective phases (U-phase, V-phase, W-phase) of the motor 16 have the same phase and the same current as shown in FIG. .
This is because if the same current is supplied to the motor 16 in the same phase, the combined magnetic field is always zero and no torque is generated by the motor 16. To realize this current, the controller 20
As shown in FIG.
a, 3a are simultaneously opened and closed (PWM controlled), and
As shown in (C), the switching transistors 1b, 2
b, 3b are simultaneously controlled to open and close (PWM control). The opening / closing timing of the set of the switching transistors 1a, 2a, 3a and the set of the switching transistors 1b, 2b, 3b is shifted by a half cycle of the current to be supplied to the motor 16. In other words, the switching transistors 1a, 2a, and 3a are subjected to PWM control for a half cycle, and the switching transistors 1a, 2a, and 3a are turned off for the next half cycle.
At F, the switching transistors 1b, 2b, 3b are subjected to PWM control. Then, in the next half cycle, the switching transistors 1b, 2b, and 3b are turned off, and the switching transistors 1a, 2a, and 3a are subjected to PWM control. Further, as shown in (D) and (E), the switching of the switching transistors 4a and 4b of the switching circuit is controlled in conjunction with the opening and closing of these. The switching transistor 4a includes switching transistors 1b, 2b, 3
ON control is performed at the same timing as the PWM control of the switching transistor 4b.
The ON control is performed at the same timing as the PWM control of a, 2a, and 3a. By controlling each switching transistor in this manner, the same phase and the same current as shown in FIG. 4A flow through the U phase, V phase and W phase of the motor 16, and the total current of these flows through the connector 17 to the commercial power supply side. Supplied to The supplied voltage value is set to a desired value by controlling the PWM control pulse of each of the switching transistors 1a to 3b of the inverter 12 by voltage feedback as described later.

FIG. 3 shows a processing flowchart of the controller 20 in the present embodiment. First, the controller 20 determines whether or not the commercial power supply voltage Vac is 0, that is, whether or not the commercial power supply is out of power (S101). If the commercial power supply is out of power, it is next determined whether or not the request switch 22 is turned on (S102). When the commercial power supply is out of power and the user turns on the request switch 22, the controller 20 executes the above-described open / close control of the switching transistors 1a to 4b to supply power to the commercial power supply (S10).
3). Supply voltage is 100V by voltage feedback
Is controlled so that

FIG. 4 is a block diagram of the voltage feedback control by the controller 20. The commercial power supply voltage Vac is detected by the voltage sensor 18 and the reference voltage Vref is detected.
(100V) is calculated, PI control (proportional-integral control) is performed, and the result is added to the initial current Iint to obtain a reference current Iref. This reference current Iref is converted into a PWM control pulse by a triangular wave to control the switching transistor 1a to be controlled.
To 3b.

As described above, in this embodiment, when the controller 20 detects a power failure of the commercial power supply, the inverter 12
The switching transistors 1a to 3b of the switching circuit 14 and the switching transistors 4a and 4b of the switching circuit 14 are controlled to open and close to supply the same phase and current to the motor 16 and supply power to the commercial power supply. The commercial power can be efficiently supplied without causing the problem.

<Second Embodiment> In the first embodiment described above, the supply voltage is set to 100 V by detecting the voltage on the commercial power supply side and performing voltage feedback. However, in the present embodiment, the supply voltage is reduced by another method. An example in which the voltage is set to 100 V will be described.

FIG. 5 shows a circuit diagram of the present embodiment. The basic configuration is the same as that of FIG.
3b and the switching transistors 4a and 4b of the switching circuit 14 are interlocked to supply the same current to the motor 16 in the same phase, but the difference is that the current supplied to the commercial power supply instead of the voltage sensor 17 is changed. The point is that a current sensor 19 for detection is provided, and the terminal voltage Vac of the connector is estimated based on the detection current Iac, and feedback control is performed.

FIG. 6 shows a controller 20 according to this embodiment.
Is shown in FIG. Based on the supply current Iac detected by the current sensor 19, the terminal voltage VB of the main battery 10, and the terminal current IB, the commercial power supply side voltage Vac
Is calculated. The calculation formula can be obtained experimentally, and is shown as Vac = f (VB ・ IB / Iac) in the figure for convenience.
Then, a difference between the voltage Vac calculated based on the detected current and the reference voltage Vref is obtained, and PI control (proportional integral control) is performed.
And adds the result to the initial current Iint to obtain the reference current Iref.
This reference current Iref is converted into a PWM control pulse by a triangular wave to control the switching transistors 1a to 3a to be controlled.
control b. As described above, in the present embodiment, by supplying the same phase and the same current to the motor 16, it is possible to supply electric power to the commercial power supply while preventing generation of torque of the motor 16, and furthermore, to supply the voltage feedback based on the detected current value. Since it is controlled, it can be more reliably supplied at a desired voltage (100 V).

[0016]

As described above, according to the present invention,
Since the same phase and the same current are supplied to each phase of the motor to supply power to the commercial power supply side, power can be supplied efficiently without generating motor torque.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is a timing chart of the embodiment.

FIG. 3 is a processing flowchart of a controller of the embodiment.

FIG. 4 is a voltage feedback control block diagram of the controller of the embodiment.

FIG. 5 is a circuit diagram of a second embodiment of the present invention.

FIG. 6 is a voltage feedback control block diagram of the controller of the embodiment.

[Explanation of symbols]

Reference Signs List 10 main battery (vehicle battery), 12 inverter (power conversion means), 14 switching circuit, 16
Motor, 17 connector, 18 voltage sensor, 19
Current sensor, 20 controllers, 22 demand switches.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02M 7/72 H02M 7/72

Claims (3)

[Claims] 1. A motor control device which uses a power conversion means for supplying on-vehicle battery power to a motor, and supplies on-vehicle battery power to the commercial power supply via the motor when a commercial power failure occurs. And a control means for supplying the same current in the same phase to the motor control device. 2. The control unit includes: a switching unit connected to the vehicle-mounted battery in parallel with the power conversion unit; a voltage detection unit configured to detect a voltage supplied to the commercial power supply; 2. The motor control device according to claim 1, further comprising: a voltage feedback unit configured to perform opening / closing control by interlocking each switch in the power conversion unit and the switching unit based on a voltage. 3. 3. The control unit includes: a switching unit connected to the vehicle-mounted battery in parallel with the power conversion unit; a current detection unit configured to detect a current supplied to the commercial power supply; A voltage feedback unit that calculates a voltage of the commercial power supply based on a current, and controls opening and closing of each switch and the switching unit in the power conversion unit in conjunction with each other based on the calculated voltage. The motor control device according to claim 1.