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power conversion device

A technology of power conversion device and conversion unit, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, irreversible DC power input conversion to AC power output, etc., which can solve the problem of poor accuracy and responsiveness. Low-cost structure, high-precision control, and good control responsiveness can be achieved without problems such as variation

Active Publication Date: 2017-07-11
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional power conversion device described in this patent document 2, since three current values ​​are detected over a plurality of carrier cycles, the responsiveness of the control deteriorates, and in fact, one phase is the detected current , while the other two are obtained by calculation, so the accuracy of the control becomes worse, resulting in problems

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0055] figure 1 It is a figure which shows the whole structure of the power conversion apparatus in Embodiment 1 of this invention.

[0056] figure 1 Among them, the three-phase AC rotating electrical machine 10 is equipped with a position sensor 11 that detects the magnetic pole position of the motor, and is constituted by, for example, a resolver. The information is output to a control unit (controller) described later.

[0057] The current command calculation unit 1, the proportional integral calculation unit 2, the three-phase voltage command calculation unit 3, the PWM drive unit 4, the current detection unit 7, the current detection phase selection unit 8, and the coordinate conversion unit 9 as the control part of the AC rotating electrical machine are composed of Microcomputer composition.

[0058] The currents flowing through the U, V, and W phases of the three-phase AC rotating electrical machine 10 from the current detecting unit 7 are input to the current detect...

Embodiment approach 2

[0133] In Embodiment 1, such as image 3 As shown, the current detection unit 7 is composed of a sample-and-hold circuit and an analog-to-digital conversion circuit, such as Figure 16 As shown, the current detection unit 7 does not include a sample-and-hold circuit, but only an analog-to-digital conversion circuit. In this case, by performing the same control as in the first embodiment, the same effects as those in the first embodiment can be obtained.

[0134] When a sample-and-hold circuit is provided, it is determined at which time the current value detection process including the current detection value sampling process is performed based on each duty ratio. In the case of a circuit, it is only necessary to determine at which time to perform the analog-to-digital conversion of the current detection value according to each duty cycle, Figure 17 A flowchart illustrating operations in this case is shown.

[0135] Figure 17 , the action is the same as above Figure 8 , ...

Embodiment approach 3

[0147] In Embodiment 1, such as image 3 As shown, the current detection unit 7 is composed of one sample hold circuit 71 and one analog-digital conversion circuit 72, but in the third embodiment, the current detection unit 7C is composed of two sample hold circuits and two analog-digital conversion circuits. The configuration of the circuit will be described.

[0148] In addition, in the third embodiment, the difference from the first embodiment lies in the current detection unit 7 and the current detection phase selection unit 8 , which will only be described below.

[0149] Figure 18 It is a diagram in the following case: the current detection unit 7C is composed of two sampling and holding circuits 71uvC and 71vwC and two analog-to-digital conversion circuits 72uvC and 72vwC, and at least has an input terminal capable of inputting to the two sampling and holding circuits, and an input terminal capable of One output terminal for output from the two analog-to-digital conv...

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Abstract

The power conversion device of the present invention includes: a control unit that performs PWM control on each switching unit of an inverter circuit (5) for driving a multi-phase AC motor (10); a current detection unit (7) that detects the current The detection unit (7) detects the current flowing through the motor (10) according to each phase; the A / D conversion unit converts the detected current detection signal into a digital signal, and performs current value detection processing; and a current detection phase selection unit (8), the current detection phase selection unit (8) selects the current detection signal detected by the current detection unit (7), and determines A The moment when the / D conversion unit performs current value detection processing within one cycle of the PWM carrier.

Description

technical field [0001] The present invention relates to a power conversion device that converts DC power into AC power and supplies it to a multiphase AC motor, and more particularly relates to a power conversion device capable of accurately detecting current output from the power conversion device with an inexpensive structure. Background technique [0002] A power conversion device that converts direct current to alternating current can cause an alternating current rotating electrical machine to generate torque by applying an alternating voltage to the alternating current rotating electrical machine. The torque of the AC rotating electrical machine is proportional to the vector product of the rotor flux of the AC rotating electrical machine and the armature current. Therefore, on the basis of controlling the torque of the AC rotating electrical machine, grasping the armature current, that is, detecting the current of the AC rotating electrical machine is more important. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02M7/48
CPCH02M7/53871H02P27/08H02M1/0009H02M7/5387
Inventor 泽田诚晋金原义彦喜福隆之青木一弘
Owner MITSUBISHI ELECTRIC CORP
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