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DC capacitor for super high power three-level inverter

A three-level frequency converter and ultra-high power technology, applied in capacitors, fixed capacitors, multiple fixed capacitors, etc., can solve problems such as the size limitation of DC capacitors, and achieve the effect of good internal heat dissipation, strong endurance, and good heat dissipation

Active Publication Date: 2017-10-20
WUXI POWER FILTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the inverter is a cabinet structure, the size of the DC capacitor is also limited

Method used

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  • DC capacitor for super high power three-level inverter
  • DC capacitor for super high power three-level inverter
  • DC capacitor for super high power three-level inverter

Examples

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] exist figure 1 It can be seen that the capacitor is mainly composed of the shell (1), the core (2), the terminal (3), the filled resin (4) and the pressure relief valve (5). The shell (1) is composed of a shell (11), a shell bottom (12) and a shell cover (13).

[0025] exist figure 2 It can be seen in the figure that the terminal block (3) is installed on the shell cover (13) of the shell (1). There are 4 connection terminals (3) in the upper and lower rows of the shell cover (13), and there are 8 connection terminals (3) in total. Terminal (3a) and terminal (3b) are the electrodes of a group of capacitors, terminal (3c) and terminal (3d) are electrodes of a group of capacitors, terminal (3e) and terminal (3f) are one group The electrodes of the capacitor, the terminal (3g) and the terminal (3h) are the electrodes of a group of capa...

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Abstract

The invention discloses a DC capacitor for a super high power three-level inverter. The capacitor is formed by a shell, cores, wiring terminals, filled resin and a pressure release valve. The shell comprises a shell body, a shell bottom and a shell cover. Each of the cores comprises elements, a connection copper foil, an intermediate insulation piece, a fixed insulation plate, an insulation protection piece, a bottom insulation piece, an electrical wire outlet copper foil, corner protectors, a bandage and a cover insulation piece. The wiring terminals are installed on the capacitor shell cover and are connected to the electrical wire outlet copper foils of the cores, and each of the wiring terminals is formed by an insulator, a round nut, a guide rod and a sealing ring. The pressure release valve is installed on the capacitor shell cover. The filled resin comprises resin filled in the gaps between the cores, the gaps between the elements, and the gaps between the cores and the shell and is polyurethane. The DC capacitor of the invention has the advantages of a small heating quantity, good heat dissipation performance, high insulation and electric resistance, strong endurance to large current, low inductance, safe operation, dryness, no oil and no leakage.

Description

technical field [0001] The invention relates to a metallized film capacitor, in particular to a DC capacitor for an ultra-high-power three-level frequency converter. Background technique [0002] The frequency converter is a power control device that converts the power frequency power supply to another frequency by using the on-off function of power semiconductor devices, and the high-voltage frequency converter refers to a high-power frequency converter with an input power supply voltage above 3000V. The main voltage levels are 3000V and 3300V. , 6000V, 6600V, 10000V and other voltage levels of high-voltage and high-power inverters. [0003] According to the number of output levels, high-voltage inverters can be divided into two-level, three-level, five-level and multi-level inverters. [0004] "Level" refers to the relative ratio of two or several points in the circuit under the same impedance. Three levels are three levels: high level V / 2, zero level 0V, low level -V / 2....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/38H01G4/224H01G2/08
CPCH01G2/08H01G4/224H01G4/385
Inventor 孙晓武李印达张剑
Owner WUXI POWER FILTER CO LTD
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