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Power conversion apparatus

A technology of power conversion device and main circuit, which is applied in the direction of output power conversion device, structural components of conversion equipment, fixed capacitor shell/package, etc., can solve problems such as heat generation, and achieve the effect of shortening the connection distance

Active Publication Date: 2011-09-21
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for example, a high-frequency pulsating current flows through the bus bar connecting the main circuit capacitor and the switching circuit, which generates heat due to the skin effect.
Also, when the length of the bus bar is long, the impedance in the high-frequency region can no longer be ignored, which also becomes a cause of surge voltage at the time of switching of the switching circuit

Method used

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Embodiment 1

[0025] First, use figure 1 The circuit configuration of the power conversion device of the first embodiment will be described. figure 1 It is a diagram showing the circuit configuration of the power conversion device of the first embodiment.

[0026] figure 1 The illustrated power conversion device 1 includes an inverter unit 20 that converts a DC voltage input from a DC power supply 2 to first connection units 101 and 102 serving as input terminals into a three-phase AC voltage, and converts The three-phase AC voltage is output to the three-phase motor M from output terminals provided on the output terminal block 40 . In addition, the first connection part 101 is connected to the negative side of the DC power supply 2 , and the first connection part 102 is connected to the positive side of the DC power supply 2 .

[0027] The inverter section 20 is a switching circuit having switching element sections 20a to 20c having a pair of semiconductor switches connected in series. ...

Embodiment 2

[0062] Next, the power conversion device of Embodiment 2 will be described. The power conversion device of the second embodiment differs from the power conversion device 1 of the first embodiment only in the structure of the main circuit capacitor. Therefore, in the following, refer to Figure 5A ~ Figure 5C The main circuit capacitor of the power conversion device of the second embodiment will be specifically described.

[0063] Figure 5A It is an exploded perspective view of the main circuit capacitor 10a of the second embodiment, Figure 5B is a perspective explanatory view showing the inside of the case 17 of the main circuit capacitor 10a, Figure 5C Yes Figure 5B B-B line profile.

[0064] like Figure 5A As shown, in the main circuit capacitor 10a of the second embodiment, the first wiring member 14a on the positive side, the second wiring member 16a on the positive side, the capacitive element part 12a, the second wiring member 15a on the negative side, and the...

Embodiment 3

[0073] Next, the power conversion device of the third embodiment will be described. The power conversion device of the third embodiment is different from the image 3 The power conversion device 1 shown has the same structure.

[0074] Image 6 It is a perspective view showing the appearance of the power conversion device 1b of the third embodiment. like Image 6 As shown, in the power conversion device 1 b , an input terminal block 71 and a connection terminal block 73 are arranged on the upper surface of the base 51 . The input terminal block 71 is provided adjacent to the output terminal block 40 , and the connection terminal block 73 is arranged at a position facing the first connection portions 101 , 102 protruding from the main circuit capacitor 10 .

[0075] In addition, in the power conversion device 1b, a pair of conductive wiring members 72, 72 are spanned between the input terminal block 71 and the connection terminal block 73, and each end portion of the wiring...

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PUM

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Abstract

A power conversion apparatus includes a switching circuit including semiconductor switches, and a main circuit capacitor connected between a DC power source and the switching circuit. The main circuit capacitor includes a capacitor element, first wiring members that connect the DC power source to the switching circuit, and second wiring members that connect the capacitor element to the switching circuit. The capacitor element, the first wiring members, and the second wiring members are received in a case.

Description

technical field [0001] The present invention relates to a power conversion device that performs power conversion through a switching circuit. Background technique [0002] Conventionally, there is known a power conversion device that converts power using a switching circuit including a semiconductor switch such as an IGBT. For example, as such a power conversion device, a voltage-source inverter that converts a DC voltage into an AC voltage by a switching circuit and outputs it is known. [0003] In such a power conversion device, a smoothing capacitor for smoothing a voltage is provided between a DC power supply and a switching circuit (for example, refer to Japanese Patent Laid-Open No. 2007-221892). This smoothing capacitor is called a main circuit capacitor, and is connected to the switching circuit through a bus bar. [0004] However, for example, a high-frequency pulsating current flows through the bus bar connecting the main circuit capacitor and the switching circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387H02M3/06
CPCH02M7/003H01G2/04H01G2/08H01G4/224H01G4/228
Inventor 犬塚爱子长尾敏男原英则
Owner YASKAWA DENKI KK
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