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Power conversion device and its motor drive device, blower, compressor, air conditioner, refrigerator, refrigerator

A power conversion device and motor technology, which is applied in the direction of motor control, AC motor control, output power conversion device, etc., can solve problems such as the complexity of control software, and achieve the effect of improving performance

Active Publication Date: 2017-08-29
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the structure where the shunt resistance of the power supply or the shunt resistance of the lower arm is provided, the control software is complicated because the detected phase current needs to be determined for each phase

Method used

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  • Power conversion device and its motor drive device, blower, compressor, air conditioner, refrigerator, refrigerator
  • Power conversion device and its motor drive device, blower, compressor, air conditioner, refrigerator, refrigerator
  • Power conversion device and its motor drive device, blower, compressor, air conditioner, refrigerator, refrigerator

Examples

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Embodiment approach

[0054] figure 1 It is a figure which shows one structural example of the power conversion apparatus concerning embodiment. exist figure 1 In the example shown, the power conversion device 100 according to the embodiment is configured to convert the DC power supplied from the DC power supply 1 into figure 1 In the example shown is a 3-phase alternating current supplied by an electric motor 9 .

[0055] Such as figure 1 As shown, the power conversion device 100 has the following main components for supplying 3-phase AC power to the load device 9: an inverter 2, which is composed of 3 bridge arms, and the 3 bridge arms include: an upper bridge arm switching element 3a to 3c (here, 3a: U phase, 3b: V phase, 3c: W phase) and lower arm switching elements 3d to 3f (here, 3d: U phase, 3e: V phase, 3f: W phase); and control part 7, which generates six drive signals corresponding to the upper arm switching elements 3a to 3c of each phase and the lower arm switching elements 3d to 3f...

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Abstract

The present invention provides a power conversion device capable of extending the phase current detection period and simplifying the detection steps, and controlling the carrier frequency to improve the performance of equipment and devices. In the power conversion device, it is provided with: a power supply shunt resistor (5), which is arranged between the negative voltage side of the DC power supply (1) and the inverter (2); and each phase lower arm shunt resistor (6a-6c ), which are respectively arranged between the lower bridge arm switching elements (3d~3f) of each phase and the power supply shunt resistor (5), wherein, the lower bridge arm switching elements (3d~3f) of each phase and the lower bridge arm shunt of each phase Each voltage between each connection point of the resistors (6a~6c) and the negative voltage side of the DC power supply (1), that is, the lower bridge arm voltage of each phase is detected, and based on each detection value, the current flowing into the load device (9) is calculated. Each phase current, and according to the change of a specific control parameter (A), control the carrier frequency of the carrier signal which is the reference frequency of each drive signal.

Description

technical field [0001] The present invention relates to a power conversion device and its motor drive device, a blower, a compressor, an air conditioner, a refrigerator, and a refrigerating machine. Background technique [0002] In a power conversion device, for example, the phase current flowing in a 3-phase load such as a motor is detected, and the load is controlled based on the current of each phase. The ON / OFF state of the switching element of the inverter is combined to generate a 3-phase AC voltage and supply it to the load. [0003] As a method of detecting each phase current flowing into a three-phase load, there is a method of providing a current sensor or a shunt resistor connected in series to a switching element constituting an inverter. As a structure for installing a shunt resistor, there are: a structure for installing a power supply shunt resistor for detecting the current between the DC power supply and the inverter device; The structure of the low-side s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
CPCH02M7/53875H02P27/085H02P2205/01H02M1/0009H02M7/501H02M7/5395
Inventor 下麦卓也植村启介有泽浩一筱本洋介梅原成雄浦慎一郎谷川诚
Owner MITSUBISHI ELECTRIC CORP
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