Single-stage power factor correction switching power supply - power supply circuit - Circuit Diagram

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Abstract: Compared with the traditional two-stage PFC converter, the single-stage PFC AC-DC converter uses only one switch and one controller. The application of single-stage PFC technology in low-power power supplies has become a subject of current research.

Keywords: single stage, power factor correction, circuit topology

1 Introduction

In order to reduce the pollution of the grid by internal switching power supplies such as office automation equipment, computers and household appliances, the International Electrotechnical Commission and some countries and regions have introduced standards such as IEC1000-3-2 and EN61000-3-2, which limit the current harmonics. Provisions. In order to meet the input current harmonic limit requirements, the most effective technical means is active power factor correction (active PFC).

The active PFC technology currently widely used is a two-stage scheme, namely an active PFC boost converter + a DC-DC converter, as shown in FIG.