Application Of APFC Technology In Power Supply For Telecommunication

The EI Intellectual communication power source has the core with a modular communication power system, an EI-RM48/15 rectifier module, an EI-PCU control module and an AC/DC distribution unit. With the flexible configuration, complete functions, reliable quality and economical prices, it is the first choice for small capacity equipments with functions of switching in, transmission and comprehensive exchange.This paper presents the structure, the principle and the design of The EI Intellectual communication power source .The system consists of the AC input stage,single phase PFC,main inverter,output low-pass filter,auxiliary power supply,and load current sharing circuit,etc.The operation principle of APFC is analyzed at first, then this paper briefly reviews the single-stage power factor correction (PFC) based on the circuit topology and control strategy, analyses the problem and give some schemes to solve, At last, a new single-stage PFC circuit is mentioned respectively, they achieved soft-switching of power switches high power factor, low input current distortion, low switching loss, high efficiency,limited the voltage spike and reduced the EMLThe design method of the key circuit parameter is particularly introduced. The result proves that the circuit can work in wide range and improve input-power-factor to unit.