Abstract

Power factor correction (PFC) technology plays a key role in controlling harmonic pollution and improving power factor. In low power applications, compared with the three-phase multi-switch PFC technology, the three-phase single-switch PFC technology has attracted people's attention owing to its simple control and low cost. In this paper, three kinds of three-phase single-switch PFC circuits and their characteristics were analyzed and compared briefly at first, and three-phase single-switch Boost PFC circuit was selected as the study object. The power factor correction mechanism of the circuit topology and fifth harmonic suppression measures were thoroughly analyzed. Parameters of a 1.5kW prototype were designed, and the power factor correction function of the circuit was verified by simulation and experiment results.

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