PFC circuit compatible with single-phase and three-phase AC input and control method thereof

Abstract

An embodiment of the invention discloses a PFC circuit compatible with single-phase and three-phase AC inputs and a control method thereof. The PFC circuit detects input states of a mains supply and athree-phase voltage by means of a voltage detection module, and feeds back detection results to a control module; the control module outputs a driving signal and a control signal according to the detection results; an input switch changeover module controls an on-off state of an internal switch according to the driving signal, accesses a live wire of an arbitrary phase among three phases of livewires to a three-phase PFC power module so as to enter a single-phase operating mode, or accesses all the three phases of live wires to the three-phase PFC power module so as to enter the single-phaseoperating mode; the three-phase PFC power module rectifies or inverts the mains supply according to the control signal; two bridge arms of the three-phase PFC power module are subjected to parallel output in the single-phase operating mode, so as to obtain twofold single bridge arm output power; and the two bridge arms are staggered and connected in parallel to perform rectification or inversion,so that current ripples of the two bridge arms counteract each other. The PFC circuit solves the problems that the existing single phase outputs 1/3 power, positive and negative bus voltages are imbalance and the ripples are large.

Description

technical field [0001] The invention relates to the technical field of power circuits and topologies, in particular to a PFC circuit compatible with single-phase and three-phase AC input and a control method thereof. Background technique [0002] AC to DC (AC / DC) power supply, such as primary communication power supply and electric vehicle on-board charger (OBC), its typical structure is usually that AC mains power is first rectified into DC power by PFC (power factor correction) circuit, and then passed through the subsequent stage The DCDC circuit converts the voltage and current required by the post-stage load. [0003] The common mains power supply input, due to the limitation of infrastructure, has two typical power distributions: single-phase and three-phase. Generally, high-power electrical devices tend to use three-phase AC power distribution, and three-phase AC power distribution is divided into two situations: with neutral line and without neutral line. Due to th...

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Problems solved by technology

[0005] In view of the above technical problems, the embodiment of the present invention provides a PFC circuit compatible with single-phase and three-phase AC input and its control method to solve the problem that the existing PFC circuit can only output 1 / 3 of the three-phase Full load power and the problem of unbalanced positive and negative bus voltage and large ripple

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