Direct-current support capacitor capable of effectively absorbing high-frequency harmonic waves

A high-frequency harmonic and DC support technology, applied in the field of capacitors, can solve the problems of uneven heating of capacitors, reduced capacitor life, easy to exceed the core, etc., to achieve uniform current distribution, reduced heat generation, and good product performance.

Active Publication Date: 2013-01-09
WUXI CHENRUI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a very big defect. Because the length of each core from the lead-out end is different, under the influence of stray inductance, the high-frequency harmonic current generally concentrates on the upper core with a short distance, resulting in uneven heat generation of the capacitor. Some cores tend to exceed the applicable temperature of the capacitor, and eventually the life of the capacitor will decrease

Method used

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  • Direct-current support capacitor capable of effectively absorbing high-frequency harmonic waves
  • Direct-current support capacitor capable of effectively absorbing high-frequency harmonic waves
  • Direct-current support capacitor capable of effectively absorbing high-frequency harmonic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: as attached figure 1 As shown, a DC support capacitor capable of effectively absorbing high-frequency harmonics includes a housing 1, and the housing 1 is provided with a core group 2 and a composite copper bar 3, and the core group 2 and the composite copper bar 3 are connected by a copper flexible wire 4, and the composite copper bar 3 is welded with two-pole lead-out ends 5, and the inside of the shell 1 is filled with potting material 6, which is used to fix the core group 2 and the Composite copper bar 3.

[0028] as attached figure 2 As shown, the composite copper bar 3 is composed of an upper copper plate 31, a lower copper plate 32, and an insulating layer 33 provided between the upper and lower copper plates.

[0029] The core group 2 includes an upper absorption core group layer 21 and a lower DC filter core group layer 22 close to the two-pole lead-out ends 5, and the upper layer absorption core group 21 and the lower DC filter core group lay...

Embodiment 2

[0031] Embodiment 2: as attached Figure 4 And attached Figure 5 As shown, the lead ends 5 of the two poles are nuts and bolts, which are respectively the upper copper plate 31 and the lower copper plate 32 on both sides of the insulation layer 33 .

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Abstract

The invention relates to a capacitor, and particularly provides a direct-current support capacitor capable of effectively absorbing high-frequency harmonic waves. The direct-current support capacitor structurally comprises a shell, a core group and a composite copper bar are arranged in the shell, the core group is connected with the composite copper bar through a copper hose, two-electrode leading-out ends are welded on the composite copper bar, and potting materials are filled inside the shell and used for fixing the core group and the composite copper bar in the shell. Compared with the prior art, the direct-current support capacitor has the advantages that the design thinking of a traditional branch support thin-film capacitor is changed, the direct-current support capacitor is better in harmonic wave absorbing performance, more convenient to mount, safer and more reliable, and the service life and stability of the direct-current support capacitor can be effectively guaranteed.

Description

technical field [0001] The invention relates to a capacitor, in particular to provide a DC support capacitor capable of effectively absorbing high-frequency harmonics used in large-scale frequency converter / inverter equipment (such as photovoltaic and wind power generation equipment). Background technique [0002] In many power electronic equipment applications, the frequency converter / inverter is a very important part (such as the photovoltaic inverter, the core part of the photovoltaic power generation system). In order to ensure the normal operation of the system, the frequency converter / inverter There is a DC support capacitor for DC support and filtering in front of the converter. The capacitor generally has a large capacity (1000-10000μF), an operating voltage of 400-2000V.DC, and an operating current of 200-1000A. Since the frequency converter / inverter will generate a large number of high-frequency harmonics to feed back to the DC-Link capacitor of the previous stage...

Claims

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Application Information

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IPC IPC(8): H01G4/224H01G4/228H01G4/38
Inventor 陈栋
Owner WUXI CHENRUI NEW ENERGY TECH
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