Power factor correction circuit and vehicle-mounted charger

Abstract

The invention discloses a power factor correction circuit and a vehicle-mounted charger. The power factor correction circuit comprises an input switching module, a three-phase bridge rectifier module, a main control module, a first capacitor and a second capacitor. When the power factor correction circuit is powered by a single-phase AC power supply, the input switching module executes first line switching, so that a live line of the single-phase AC power supply is enabled to be connected with a first input end and a second input end of the three-phase bridge rectifier module through the input switching module, and a neutral line of the single-phase AC power supply is enabled to be connected with a third input end of the three-phase bridge rectifier module and a capacitor midpoint through the input switching module; and the three-phase bridge rectifier module rectifies the single-phase AC power supply and realizes power factor correction, and one bridge arm thereof generates power frequency compensation current. The power frequency compensation current in the bridge arm can eliminate power frequency ripples in the output current of the three-phase bridge rectifier module, so that an output capacitor with smaller capacity can be adopted, the size can be effectively reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a power factor correction circuit and a vehicle charger. Background technique [0002] Power Factor Correction (PFC) circuit is an electronic circuit used to improve the power factor of electrical equipment in the field of power electronics. With the continuous development of power electronics technology, miniaturization, low cost, and high efficiency have become its The direction of continuous development. [0003] In the prior art, the PFC circuit topology compatible with single-phase AC and three-phase AC input is as follows: figure 1 As shown, the topology of the PFC circuit is a three-leg PFC circuit, and a relay is installed at the AC input end, and the switching between single-phase AC input and three-phase AC input is realized through the opening and closing of the relay. When the three-leg PFC circuit works in the single-phase AC input mode, two of the brid...

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Problems solved by technology

[0004] The present invention provides a power factor correction circuit, which is used to solve the problem of large volume and high cost of the three-bridge PFC circuit due to power frequency ripples in the output current when the existing three-bridge PFC circuit works in the single-phase AC input mode. The problem

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