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Power conversion devices and their motor drives, blowers, compressors, air conditioners, refrigerators, refrigerators

A power conversion device and blower technology, which is applied in the direction of AC motor control, output power conversion device, electrical components, etc., can solve problems such as the complexity of control software, and achieve the effect of high precision and extended detection period

Active Publication Date: 2018-02-27
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 devices and their motor drives, blowers, compressors, air conditioners, refrigerators, refrigerators
  • Power conversion devices and their motor drives, blowers, compressors, air conditioners, refrigerators, refrigerators
  • Power conversion devices and their motor drives, blowers, compressors, air conditioners, refrigerators, refrigerators

Examples

Experimental program
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Effect test

Embodiment approach 1

[0058] figure 1 is a diagram showing an example of the configuration of the power conversion device according to the first embodiment. exist figure 1 In the example shown, the power conversion device 100 according to Embodiment 1 is configured to convert the DC power supplied from the DC power supply 1 intofigure 1 In the example shown is a 3-phase alternating current supplied by an electric motor 9 .

[0059] Such as figure 1 As shown, the power conversion device 100 has the following main components for supplying 3-phase AC power to the motor 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 a control section 7. It generates six drive signals corresponding to the upper arm switching elements 3a to 3c of each phase and the lower arm switching elements 3d t...

Embodiment approach 2

[0129] In Embodiment 1, the method of connecting the lower arm shunt resistors to the lower arm switching elements of the two phases in the U phase, the V phase, and the W phase, and connecting the lower arm switching elements of the two phases arm voltage is detected to calculate the phase currents iu, iv, and iw flowing into the load device. However, in this embodiment, the following method will be described. and the lower arm switching elements of each phase of the W phase are connected, the lower arm voltages of these three phases are detected, and the currents iu, iv, and iw of each phase flowing into the load device are calculated.

[0130] Figure 11 It is a figure which shows one structural example of the power conversion apparatus concerning Embodiment 2. In addition, the same code|symbol is attached|subjected to the same or equivalent structural part as Embodiment 1, and detailed description is abbreviate|omitted.

[0131] In addition to the structure of Embodiment...

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Abstract

The present invention provides a power conversion device capable of increasing the detection period of each phase current without increasing the size and cost of the device, and realizing high precision control based on each phase current. The power conversion device 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 the lower bridge arm shunt resistors (6a, 6b) of each phase, They are respectively arranged between the switching elements (3d, 3e) of the lower bridge arms of each phase of two of the three bridge arms and the power supply shunt resistor (5), wherein the switching elements (3d, 3e) of the lower bridge arms of each phase 3e) and the voltages between the connection points of the lower arm shunt resistors (6a, 6b) of each phase and the negative voltage side of the DC power supply (1), and based on the detected values, calculate the flow into the load device (9 ) of each phase current.

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): H02M7/5387H02P27/06
CPCH02M7/53875H02M7/53873H02P27/06H02M1/0009H02M7/53876H02M7/53871
Inventor 植村启介下麦卓也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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