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Three-phase LC series current-limiting circuit and method thereof

A current-limiting circuit, three-phase AC technology, applied in electrical components, irreversible AC power input into DC power output, output power conversion devices, etc., can solve problems such as poor current filtering, secondary current impact, etc. Improve the effect of energy saving, eliminate the impact of secondary current, and be easy to promote and use

Pending Publication Date: 2020-08-07
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This circuit and its method are designed to solve the problems of secondary current impact and poor current filtering in traditional soft charging technology. A three-phase diode rectification circuit is formed by a diode rectifier bridge and an energy storage capacitor to eliminate secondary current impact and improve energy-saving effect. promotional use

Method used

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  • Three-phase LC series current-limiting circuit and method thereof
  • Three-phase LC series current-limiting circuit and method thereof
  • Three-phase LC series current-limiting circuit and method thereof

Examples

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Effect test

Embodiment 1

[0047] The present invention is a three-phase LC series current limiting circuit, such as figure 1 As shown, it includes three-phase AC power supply 1, three-phase diode rectifier bridge B1, first voltage limiting capacitor C1, second voltage limiting capacitor C2, energy storage capacitor E1, first relay RL1, second relay RL2, first DC A power source 2 and a second DC power source 3 .

[0048] Wherein, the first input terminal of the three-phase diode rectifier bridge B1 is connected to the first live line u of the three-phase AC power supply 1 through the first voltage limiting capacitor C1 a connection, the second input terminal is connected to the second fire wire u of the three-phase AC power supply 1 through the second voltage limiting capacitor C2 b Connection, the third input terminal and the third live wire u of the three-phase AC power supply 1 c connected to convert the AC current of the three-phase AC power supply 1 into a DC current; the positive pole of the ene...

Embodiment 2

[0068] The present invention is a three-phase LC series current limiting circuit, such as figure 2 As shown, it includes three-phase AC power supply 1, three-phase diode rectifier bridge B2, first voltage limiting capacitor C3, second voltage limiting capacitor C4, energy storage capacitor E2, first relay RL3, second relay RL4, first DC A power source 2 and a second DC power source 3 .

[0069] Wherein, the first input terminal of the three-phase diode rectifier bridge B2 is connected to the first fire wire u of the three-phase AC power supply 1 through the first voltage limiting capacitor C3 a connection, the second input terminal is connected to the second fire wire u of the three-phase AC power supply 1 through the second voltage limiting capacitor C4 b Connection, the third input terminal and the third live wire u of the three-phase AC power supply 1 c connected to convert the AC current of the three-phase AC power supply 1 into a DC current; the positive pole of the en...

Embodiment 3

[0089] The present invention is a three-phase LC series current limiting circuit, such as image 3As shown, it includes three-phase AC power supply 1, three-phase diode rectifier bridge B3, first voltage limiting capacitor C5, second voltage limiting capacitor C6, energy storage capacitor E3, first relay RL5, second relay RL6, first DC A power source 2 and a second DC power source 3 .

[0090] Wherein, the first input terminal of the three-phase diode rectifier bridge B3 is connected to the first fire wire u of the three-phase AC power supply 1 through the first voltage limiting capacitor C5 a connection, the second input terminal is connected to the second fire wire u of the three-phase AC power supply 1 through the second voltage limiting capacitor C6 b Connection, the third input terminal and the third live wire u of the three-phase AC power supply 1 c connected to convert the AC current of the three-phase AC power supply 1 into a DC current; the positive pole of the ener...

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Abstract

The invention discloses a three-phase LC series current-limiting circuit which comprises: a three-phase alternating current power supply; a three-phase diode rectifier bridge, wherein the first inputend and the second input end of the three-phase diode rectifier bridge are connected with a three-phase alternating-current power supply through a first voltage-limiting capacitor and a second voltage-limiting capacitor respectively; an energy storage capacitor, wherein the anode and the cathode of the energy storage capacitor are connected with the three-phase diode rectifier bridge; a first relay, wherein the first end and the second end of the first relay are connected with the first end and the second end of a first voltage-limiting capacitor respectively, the third end is connected with the first direct-current power supply, and the fourth end is connected with the first direct-current power supply through a signal control end; and a second relay, wherein the first end and the secondend of the second relay are connected with the first end and the second end of the second voltage-limiting capacitor respectively, the third end is connected with the second direct-current power supply, and the fourth end is connected with the second direct-current power supply through the signal control end. The problems of secondary current impact and poor filtering of a traditional soft charging technology are solved, secondary current impact is eliminated through the diode rectifier bridge and the energy storage capacitor, the energy-saving effect is improved, and application and popularization are easy.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-phase LC series current limiting circuit and a method thereof. Background technique [0002] Three-phase diode rectification circuits or power electronic conversion circuits containing three-phase diode rectification circuits are widely used in industrial electrical appliances, power systems and other application fields. The rear stage of the three-phase diode rectifier circuit is filtered by an electrolytic capacitor to obtain a DC voltage, which provides DC power for the power electronic converter of the latter stage. [0003] The three-phase diode rectifier circuit needs to adopt soft charging technology, so that the electrolytic capacitor is charged slowly, thereby suppressing the peak current of the grid side, so as to protect the entire circuit from burning, from malfunction and reduce EMI interference. So far, the main soft charging technologies include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/06
CPCH02M1/32H02M7/06
Inventor 陈圣泽江剑峰王新刚蒋超顾臻陈金涛赵舫翁素婷
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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