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Power conversion device and refrigeration cycle device provided with power conversion device

A power conversion device and power technology, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, household appliances, etc., can solve the problems of increased power loss, equipment malfunction, etc., and achieve electromagnetic noise Reduced effect

Pending Publication Date: 2020-06-26
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a switching element with a high withstand voltage is used to prevent damage due to a spike voltage, power loss increases
In addition, since the spike voltage promotes the generation of electromagnetic noise, there is a concern that it may cause malfunction of the equipment

Method used

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  • Power conversion device and refrigeration cycle device provided with power conversion device
  • Power conversion device and refrigeration cycle device provided with power conversion device
  • Power conversion device and refrigeration cycle device provided with power conversion device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 》

[0035]

[0036] figure 1 It is a block diagram including the power conversion device 100 of the first embodiment.

[0037] figure 1 The illustrated power conversion device 100 is an inverter that converts DC power input from a DC power supply E into three-phase AC power and outputs the three-phase AC power to a motor M. As shown in FIG. Additionally, as figure 1 For the shown DC power supply E, an AC power supply (not shown) and a converter (not shown) for converting AC to DC may also be used.

[0038] like figure 1 As shown, the input side of the power conversion device 100 is connected to the positive pole of the DC power supply E via the positive side power line P (DC power supply line), and is connected to the negative pole of the DC power supply E via the negative side power line N (DC power supply line). . Furthermore, a DC voltage is applied to the input side of the power conversion circuit 30 via the above-mentioned "DC power supply line". In addition, the posi...

no. 1 approach

[0103] Furthermore, in order to reduce the power loss of the power conversion circuit 30 , it is possible to use a small component as the heat sink 70 . Therefore, according to the first embodiment, it is possible to reduce the size of the power conversion device 100 including the heat sink 70 .

no. 2 approach 》

[0105] In the second embodiment, on the printed wiring board 60A (refer to Figure 7A ) with predetermined conductor patterns k, h installed on one side (refer to Figure 7A ), which is different from the first embodiment. In addition, other structures are the same as those of the first embodiment. Therefore, portions different from those of the first embodiment will be described, and descriptions of overlapping portions will be omitted.

[0106] Figure 7AIt is an explanatory diagram showing conductor patterns k and h on the component surface of the printed wiring board 60A included in the power conversion device.

[0107] like Figure 7A As shown, the parasitic inductance reducing unit 20A includes a positive-side conductive pattern k, a negative-side conductive pattern h, and a snubber capacitor 21 . The conductor pattern k on the positive electrode side includes the first conductor pattern k1 (refer to Figure 7B ) and the second conductor pattern k2 (refer to Figu...

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PUM

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Abstract

The invention provides a power conversion device and the like which realize the reduction of power loss and electromagnetic noise. The power conversion device (100) is provided with first conductor patterns (k1, h1) which are connected to the positive electrode side and the negative electrode side of a power conversion circuit (30), respectively, and are a part of a DC power supply line; and second conductor patterns (k2, h2) which connect the power conversion circuit (30) and a snubber capacitor (21) to the positive electrode side and the negative electrode side, respectively. A second conductor pattern (k2) is provided in the vicinity of an input terminal (IP) on the positive electrode side of the power conversion circuit (30) so as to be close to the first conductor pattern (k1). Furthermore, a second conductor pattern (h2) is provided in the vicinity of the input terminal (IN) at the negative electrode side of the power conversion circuit (30) so as to be close to the first conductor pattern (h1).

Description

technical field [0001] The present invention relates to power conversion devices and the like. Background technique [0002] A power conversion device such as an inverter for driving a motor is known. The inverter supplies power to a motor as a load by performing switching operations of semiconductor switching elements. Furthermore, due to the switching operation, a current change occurs in the wiring connecting the semiconductor switching element and the DC power supply, and counter electromotive force is generated due to parasitic inductance on the wiring. [0003] As a result, when the current of the semiconductor switching element is interrupted, a voltage obtained by combining the aforementioned counter electromotive force and the power supply voltage is applied to the semiconductor switching element. In addition, the counter electromotive force generation period is extremely short compared with the switching pulse width of the semiconductor switching element, and its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M1/44H05K7/20F24F11/88
CPCH02M7/48H02M1/44H05K7/20909F24F11/88H02M1/0048Y02B70/10
Inventor 大石孝大田将志大久保敏一
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC