Bridgeless power factor correction converter with single inductance and three levels

Abstract

The invention relates to a bridgeless AC / DC power factor converter with low on-state loss and aims to provide a bridgeless power factor correction converter with single inductance and three levels. The converter comprises an input inductance, a Boost arm circuit, a clamping circuit and an output voltage-dividing capacitor, wherein the Boost arm circuit is formed by connecting two switch tubes and two diodes in series. The two diodes are arranged at the outside of the Boost arm circuit, and the two switch tubes are arranged at the inside. An anode of the diode DF1 is connected with a drain electrode of a switch S1, a source electrode of the switch S1 is connected with a drain electrode of a switch S2, and a source electrode of the switch S2 is connected with a cathode of the diode DF2. The switch tubes of the Boost arm circuit are opened and closed, and then the charging and discharging on the inductance and the power factor correction of the input end are realized. The invention only needs one input inductance to obtain two negative and positive DC buses, and has the advantages of low stress and high utilization rate of the device, low on-state loss, low common-mode interference and high conversion efficiency.

Description

technical field [0001] The invention relates to a bridgeless AC / DC power factor converter with low on-state loss, in particular to a single inductance three-level bridgeless power factor correction converter. Background technique [0002] The current single-phase power factor correction technology generally adopts the traditional Boost power factor correction converter. This converter consists of two parts: rectifier bridge and Boost converter. The rectifier bridge rectifies the AC mains into a unidirectional voltage source; the Boost converter realizes power factor correction through a certain control method. This single-phase power factor correction converter is applied to the global universal power input (90VAC-264VAC), and can achieve power factor correction relatively well, but when it works in applications with low input voltage, the loss of this converter will increase. The large increase is mainly due to the rapid increase of on-state losses at low input voltages. ...

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Problems solved by technology

However, these bridgeless converters require two sets of Boost circuits to work in the positive and negative half cycles of the AC input voltage respectively, and only have one DC bus output, so the device utilization rate is low, the volume is large, and the cost is high; moreover, these bridgeless converters Or the common mode interference is large or cannot work in the current continuous mode (CCM), and additional power devices such as power diodes and inductors are required to improve performance, which increases the complexity and cost of the circuit

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