Power conversion device

A power conversion device and power conversion technology, which is applied in the direction of output power conversion devices, circuits, electrical components, etc., can solve the problems of increased switching loss, large-scale cooling structure, and increased cost, achieving high-efficiency power conversion and reducing wiring inductance Effect

Inactive Publication Date: 2011-02-02
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the switching speed is reduced to reduce the surge voltage, the switching loss increases, and as a result, the cooling structure increases in size, resulting in an increase in cost

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0087] figure 1 The configuration of the power conversion device according to Embodiment 1 of the present invention is shown. This power conversion device 100 has a smoothing capacitor 150 and an inverter circuit 120 . The inverter circuit 120 controlled by a control device 430 converts DC input from a DC power supply 410 into three-phase AC, and supplies the three-phase AC motor 420 . The three-phase AC motor 420 is used to drive the compressor provided in the refrigerant circuit of the air conditioner. In addition, the DC power supply 410 may be constituted by, for example, an inverter circuit or the like for rectifying an AC power supply such as a commercial AC power supply.

[0088] The smoothing capacitor 150 is a capacitor that smoothes the voltage of the DC power supply. The smoothing capacitor 150 can be, for example, an electrolytic capacitor. The upper limit of the allowable temperature of the electrolytic capacitor is about 100° C., so in the present embodiment, ...

Embodiment approach 2

[0114] Figure 4 is an example in which a snubber circuit is provided for each phase of the switching element 130 . In this example, these snubber circuits use image 3 The snubber circuit shown in B. In addition, the driving circuit and the like are omitted in this figure. In this inverter circuit 120, each constituent element is also constituted using only components capable of operating at 150° C. or higher.

[0115] The "phase" mentioned here refers to the part where the switching elements 130 are connected in series (in Figure 4 middle finger series circuit 170). Such a snubber circuit arrangement is effective when wiring inductance between phases becomes a problem, as in high-speed switching.

Embodiment approach 3

[0117] In Embodiment 3 of the present invention, an example in which a power conversion device is used for a heat pump device will be described.

[0118] The heat pump device according to Embodiment 3 of the present invention constitutes an air conditioner 1 that switches between indoor cooling and heating. Such as Figure 5 As shown, the air conditioning device 1 has a refrigerant circuit 10 . Freon refrigerant is filled in the refrigerant circuit 10 as a refrigerant. The refrigerant circulates in the refrigerant circuit 10 to perform a vapor compression refrigeration cycle.

[0119]

[0120] A compressor 20 , an indoor heat exchanger 21 , an expansion valve 22 , an outdoor heat exchanger 23 , and a four-way switching valve 24 are connected to the refrigerant circuit 10 . The compressor 20 of Embodiment 3 is a rotary compressor and constitutes the fluid machine of the present invention. The details of the compressor 20 will be described later. The indoor heat exchanger...

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PUM

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Abstract

Disclosed is a power conversion device that is provided with a switching element (130) that is constituted to be capable of high-temperature operation, and that converts AC power supplied from an AC power source or DC power supplied from a DC power source to AC power of a specified voltage and frequency. A snubber circuit (300) is provided that is constituted to be capable of high-temperature operation and that contains a capacitor (301) that is constituted to be capable of high-temperature operation.

Description

technical field [0001] The present invention relates to a power conversion device having a switching element. Background technique [0002] Conventionally, as power conversion devices such as inverters that convert DC voltage to AC voltage and converters that convert AC voltage to DC voltage, devices that perform power conversion operations using a plurality of switching elements are known. Also, there is already an example in which a switching element of such an inverter is configured using a SiC semiconductor device (for example, refer to Patent Document 1). [0003] Wide bandgap semiconductors such as the above-mentioned SiC semiconductors have a higher dielectric breakdown electric field than conventional Si semiconductors (semiconductors using Si crystals) (about 10 times higher for SiC semiconductors), so it is easy to achieve higher withstand voltages of devices, If the withstand voltage is the same, since the thickness of the device can be reduced compared with Si s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/00H05K7/20
CPCH02M7/003H02M2001/348H02M7/48H01L2224/48091H01L2224/48137H01L2924/13091H02M1/348H01L2924/00014H01L2924/00
Inventor 日比野宽关本守满
Owner DAIKIN IND LTD
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