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Power conversion device

A power conversion device and power conversion technology, which are applied in the direction of high-efficiency power electronic conversion, output power conversion device, adjustment of electrical variables, etc., can solve the problems of ringing easily becoming noise, noise increase, etc. Effect

Pending Publication Date: 2021-01-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In switching elements, when switching characteristics are improved, noise may increase
In particular, ringing generated in the switching element itself due to switching, ringing caused by recovery current generated when the reverse blocking diode commutates, and the like are likely to become noise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a block diagram showing a configuration example of the motor drive device 100 according to Embodiment 1 of the present invention. The motor drive device 100 includes a rectifier circuit 30 , a power conversion device 40 , and an inverter 50 . The converter 70 is constituted by the rectification circuit 30 and the power conversion device 40 . The motor drive device 100 is connected to the AC power source 20 and the motor 60 .

[0025] The rectification circuit 30 includes a diode bridge including four rectification elements 31, and converts the AC power supplied from the AC power supply 20 into DC power. figure 1 The shown structure of the rectification circuit 30 is an example, and the structure of the rectification circuit 30 is not limited thereto. In addition, the power supplied to the motor drive device 100 is not limited to AC power, and DC power may be supplied. For the power conversion device 40 , the supply source of the DC power may be the re...

Embodiment approach 2

[0043] In Embodiment 1, the power conversion device 40 includes the same number of first capacitors 1 as the number of chopper circuits. In Embodiment 2, the power conversion device includes first capacitors 1 that are fewer in number than chopper circuits. Portions different from Embodiment 1 will be described.

[0044] Figure 4 It is a block diagram showing a configuration example of the motor drive device 100a according to the second embodiment. In the motor drive device 100a, with respect to figure 1 In the motor drive device 100 according to Embodiment 1 shown, the power conversion device 40 is replaced by a power conversion device 40a. The converter 70a is constituted by the rectification circuit 30 and the power conversion device 40a.

[0045] In the power conversion device 40a, from figure 1 In the power conversion device 40 according to Embodiment 1 shown, one first capacitor 1 is deleted. In the power conversion device 40, such as figure 1 As shown, the secon...

Embodiment approach 3

[0049] In the third embodiment, one first diode 2 and one reactor 3 are deleted from the power conversion device 40 a of the second embodiment. Portions different from Embodiment 2 will be described.

[0050] Figure 5 It is a block diagram showing a configuration example of the motor drive device 100b according to the third embodiment. In the motor driving device 100b, with respect to Figure 4 In the motor drive device 100a of Embodiment 2 shown, the power conversion device 40a is replaced with a power conversion device 40b. The converter 70b is constituted by the rectification circuit 30 and the power conversion device 40b.

[0051] In the power conversion device 40b, from Figure 4 In the power conversion device 40a according to Embodiment 2 shown, one first diode 2 and one reactor 3 are deleted. In Embodiment 3, the first diode 2 and the reactor 3 are combined to form one first diode 2 and one reactor 3 . In the power conversion device 40b, unlike the first and seco...

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PUM

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Abstract

The present invention is connected between a supply source of first direct-current power and a supply destination of second direct-current power obtained by power conversion of the first direct-current power, the present invention comprising: a switching element (4); a reactor (3) connected to one end of the switching element (4); a first diode (2), the anode of which is connected to a first connection point (10) where one end of the switching element (4) and one end of the reactor (3) are connected, and the cathode of which is connected to the other end of the reactor (3); a first capacitor (1), one end of which is connected to a second connection point (11) where the other end of the reactor (3) and the cathode of the first diode (2) are connected, and which is connected in parallel to the supply source; and a second diode (5), of which the anode is connected to the first connection point (10) and the cathode is connected to the supply destination.

Description

technical field [0001] The present invention relates to a power conversion device for converting AC power into DC power. Background technique [0002] As a motor drive device using an inverter, a converter that converts AC power supplied from a power grid into DC power is used. As a converter, a step-up chopper that can control the input power of the inverter is often used for the purpose of expanding the driving area, reducing loss, improving the power factor, and the like. The step-up chopper is a circuit composed of a rectifier circuit connected to the power system, a reactor, a switching element, a reverse blocking diode, a capacitor, and the like. The switching element and the capacitor are connected in parallel to the rectification circuit, and both ends of the switching element and the capacitor are connected to both ends of the rectification circuit. The reactor is connected so that the positive side of the output of the rectifier circuit is connected to the switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M3/155
CPCF24F11/88H02P27/06H02M1/34H02M1/44H02M1/4225H02M3/1584H02M5/458H02M1/32H02M1/0051H02M1/0048H02M1/346H02M3/155H02M7/06H02M3/158H02M1/342
Inventor 岩崎宪嗣有泽浩一山川崇下麦卓也一木智菅郁朗
Owner MITSUBISHI ELECTRIC CORP