Common-anode half-bridge power factor correction circuit

Abstract

The invention provides a common-anode half-bridge power factor correction circuit which comprises a first chopping unit and a second chopping unit. The first chopping unit is used for achieving unity power factor single-phase AC-DC conversion in a network voltage positive half cycle and outputting stable direct-current voltages. The second chopping unit is used for achieving unity power factor single-phase AC-DC conversion in a network voltage negative half cycle and outputting stable direct-current voltages. The first chopping unit and the second chopping unit work in a time division mode according to the complete network voltage negative half cycle or network voltage positive half cycle and are used for cooling in the standby process. The common-anode half-bridge power factor correction circuit can achieve single-phase power factor correction, and has the advantages of being simple in structure, supporting large power output, saving total cost and the like.

Description

technical field [0001] The present invention relates to a single-phase power factor corrector (PFC) in the technical field of power electronic conversion, in particular to a common anode half-bridge power factor correction circuit. Background technique [0002] In order to improve the grid-side power factor of single-phase AC-DC converters using single-phase diode uncontrolled rectifier bridges, reduce the harm of harmonic currents, and make them comply with relevant standards for harmonic currents, such as IEC61000-3-2, it is necessary to use Single-phase active power factor correction (APFC) technology or single-phase active power factor correction technology. [0003] In terms of circuit topology, single-phase APFC has a variety of circuit topologies, including traditional single-stage bridged APFC, two-stage or multi-stage interleaved bridged APFC, and bridgeless APFC with improved power levels. The working principle of single-phase APFC is often closely related to the ...

AI Technical Summary

Problems solved by technology

The working principle of single-phase APFC is often closely related to the circuit topology. Generally speaking, an APFC circuit may have multiple control strategies, and one control strategy may satisfy multiple APFC circuits, but for some circuits, only independent and applicable control strategies can be used.

[0004] With the development of single-phase APFC technology, in the application fields such as high-power inverter air conditioners, the power level of single-phase APFC is required to be larger and larger. At present, multi-stage interleaved APFC with bridges must be used, otherwise it is difficult to solve the heat dissipation problem of power devices and upgrade Piezoelectric inductance board mounting issues and cost issues

However, the high-power design of single-stage APFC is relatively mature, the operation is relatively reliable, the design is relatively easy, and the overall cost is relatively controllable

Single-phase bridgeless APFC also has the problem of difficulty in detecting the inductor current and supporting lower power levels.

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