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Three-phase rectifier circuit with low harmonic wave continuous input current

An input current, three-phase rectification technology, applied in the field of power electronics, can solve problems such as high total current harmonic content, low full power factor, and grid harmonic pollution

Active Publication Date: 2012-05-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the problems of the known three-phase rectifier circuit with capacitor filtering are that the input current is intermittent, the total harmonic content THD (%r) of the current is very high, the full power factor PF is low, and harmonics are generated to the power grid Pollution, harmonics have become a kind of electric public hazard, the most effective way to solve it is to connect a harmonic suppression device at the input end of the equipment

Method used

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  • Three-phase rectifier circuit with low harmonic wave continuous input current
  • Three-phase rectifier circuit with low harmonic wave continuous input current
  • Three-phase rectifier circuit with low harmonic wave continuous input current

Examples

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Embodiment 1

[0023] figure 2The circuit diagram of this embodiment is given, the three-phase rectifier circuit of low harmonic continuous input current includes three-phase four-wire alternating current, phase a, b, c and neutral line N; a three-phase rectifier KM1; a single-phase rectifier KM2 ; Capacitors C1, C2, C3; Diodes D1, D2; Inductors L1, L2; Switch tubes M1, M2, M3; Transformer T1; Sensors S1, S2, S3; The alternating current a, b, c is divided into two paths, one path is connected to a three-phase rectifier KM1, the second path is connected to one end of three switching tubes M1, M2, M3, the other ends of the three switching tubes are connected, and the common end is connected to One end of the primary side of the transformer T1, the other end of the primary side is connected to the neutral line N; the secondary side of the transformer T1 is input to the single-phase rectifier KM2; the positive output of the three-phase rectifier KM1 is connected to one end of the inductor L1; t...

Embodiment 2

[0027] image 3 The circuit diagram of this embodiment is given, including three-phase alternating current a, b, c; a three-phase rectifier KM1; a single-phase rectifier KM2; capacitors C2, C3, C4, C5; diodes D1, D2; inductors L1, L2; Switching tubes M1, M2, M3; transformer T1; sensors S1, S2, S3; and a control circuit for controlling the switching tubes; the feature is: the three-phase alternating current a, b, c is divided into two circuits, one of which is connected to a three-phase rectifier KM1 , the second circuit is connected to one end of the three switching tubes M1, M2, M3, the other ends of the three switching tubes are connected, the common end is connected to one end of the primary side of the transformer T1, the capacitors C4 and C5 are connected in series, and the primary side of the transformer T1 The other end is connected to the common end of C4 and C5; the secondary side of transformer T1 is input to single-phase rectifier KM2; the positive output of three-p...

Embodiment 3

[0031] Figure 4 The circuit diagram of this embodiment is given, including three-phase alternating current a, b, c; a three-phase rectifier KM1; capacitors C2, C4, C5; diode D1; inductors L1, L3; switch tubes M1, M2, M3; sensor S1 , S2, S3; and a control circuit for controlling the switching tubes; it is characterized in that: the three-phase alternating current a, b, c is divided into two paths, one path is connected to a three-phase rectifier KM1, and the second path is connected to three switching tubes M1, M2 , one end of M3, the other end of the three switching tubes are connected, and its common end is connected to one end of the inductor L3; capacitors C4 and C5 are connected in series; the other end of the inductor L3 is connected to the common end of C4 and C5; the positive pole of the three-phase rectifier KM1 The output is connected to one end of the inductor L1; the capacitor C2 and the diode D1 are connected in parallel at both ends of the L1; the other end of L1...

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Abstract

A three-phase rectifier circuit with low harmonic wave continuous input current related to the invention can reduce harmonic wave distortion and belongs to the field of power electronics. The three-phase rectifier circuit comprises three-phase four-wire AC current, phase current a, b, c and neutral wire N; a three-phase rectifier KM1; a single-phase rectifier KM2; capacitors C1, C2, C3; diodes D1, D2; inductors L1, L2; switching tubes M1, M2, M3; transformer T1; sensors S1, S2, S3; and a control circuit controlling the switching tubes. By controlling conduction of the switching tubes, the circuit of the invention boosts part of the phase voltage which does not work, rectifies it by the single-phase rectifier KM2 and parallel connects it and output of the three-phase rectifier KM1 to the capacitor C1 to supply energy to the load such that the phase voltage can work continuously, the input current is continuous and approximate to sine wave in order to improve the total power factor and to reduce harmonic wave pollution caused by the rectifier circuit to the grid.

Description

technical field [0001] The invention relates to a three-phase rectifier circuit that changes the input current from discontinuous to continuous, which can improve the power factor, reduce the harmonic distortion rate, and reduce the harm of the harmonics of the power supply to the power grid, belonging to the technical field of power electronics . Background technique [0002] In the prior art, the problems of the known three-phase rectifier circuit with capacitor filtering are that the input current is intermittent, the total harmonic content THD (%r) of the current is very high, the full power factor PF is low, and harmonics are generated to the power grid Pollution and harmonics have become a kind of electric power pollution. The most effective way to solve it is to connect a harmonic suppression device at the input end of the equipment. Contents of the invention [0003] The present invention aims at the deficiencies in the prior art, and proposes a three-phase rectif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H02M1/42H02M1/12
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 陈树君吴日光王海亮陈建辉于洋
Owner BEIJING UNIV OF TECH
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