Comparison of two high power factor switching power supply circuits

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Overview:
In this paper, for the traditional switching power supply, the input circuit adopts uncontrollable diode or phase-controlled thyristor rectification, and the input current harmonic content is large, the power factor is low. The circuit design of two high-power-factor switching power supplies is proposed, and the APFC technology is analyzed. And PWM rectification technology to improve the principle of switching power supply power factor, and use Matlab7.6 simulation software to simulate single-phase full-bridge voltage-type PWM rectifier circuit and APFC circuit. The simulation results show that the switching power supply based on PWM rectification technology can better achieve high power factor and reduce harmonic current.

Single-phase full-bridge voltage-type PWM rectifier circuit diagram:

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