A three-phase interleaved parallel power factor correction circuit

Abstract

The invention discloses a three-phase interleaving parallel-connection power factor correction circuit. The three-phase interleaving parallel-connection power factor correction circuit comprises first conversion units, second conversion unit, a first capacitor group, and a second capacitor group, and the first capacitor group and the second capacitor group are parallely connected together. Each three-phase input end is connected with the corresponding first conversion unit and the corresponding second conversion unit. The topological structures of the first conversion units and the corresponding topological structures of the second conversion units are interleaved and parallely connected together to form the power factor correction circuit having a three-phase three-switch three-level topology interleaving parallel-connection structure. During the working, ripple currents are mutually offset, and input output current impulses are reduced, and electromagnetic interferences are effectively reduced, and power density of a power supply is improved. The reduction of the ripple currents is used to effectively reduce sizes of filtering capacitors and filtering inductors, is used to improve the heat dissipation performance of the circuit, and is used to guarantee reliability of a power supply system. The inductors of the three-phase interleaving parallel-connection power factor correction circuit adopts physical structures of coupling inductors, and on the basis of the interleaving and parallel connection, impulses of input current and inductive current are further reduced, the sizes of the inductors are reduced, costs are reduced, and reliability is improved.

Description

technical field [0001] The invention relates to the technical field of power factor correction, in particular to a three-phase interleaved parallel power factor correction circuit. Background technique [0002] With the development of new energy industry, power factor correction has become an indispensable part of power system design. Among them, power factor refers to the ratio of effective power to total power consumption (apparent power), which is used to measure the degree of effective use of power. The higher the power factor, the higher the power utilization rate; and the power factor correction is by adjusting The way of current and voltage phase improves power factor. A power factor correction circuit is usually provided in a power supply system to implement power factor correction and improve power utilization. [0003] For power factor correction, it is common to use such as figure 1 The power factor correction circuit shown. The power factor correction circuit...

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Problems solved by technology

[0005] This application provides a three-phase interleaved parallel power factor correction circuit to solve the problems of high electromagnetic interference, high processing cost and difficulty, and low reliability in the power supply system in the prior art

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