The Research Of A New Kind Of PFC Digital Switching Power Supply Base On DSP

Reducing harmonic pollution especially conventional AC/DC rectifier generated and improving the power factor are hotspot in power electronics fields. With the development of digital technique ,more and more PFC control algorithms can be implemented in power electronics by the digital signal processors(DSP).Nowadays it is popular to use digital control in power supply design.Based on active power factor correction(APFC)of average current mode control,the paper introduce the design and implementation of a fully digital controlled single-phase novel half-bridge power factor corrector. The control method is realized using digital signal processor(DSP).At first,the basic working principle of novel single-phase half-bridge is studied. The paper research small signal model of PFC circuit and build the simplified average small signal model of the system. The double closeloop framework is applied in the PFC control circuit and the PI algorithm is adopted. Based on simplified average small signal model,the paper develop design method of PI regulators which are applied in double closeloop system. The hardware design and software design are presented.Furthermore,the main program flow chart are given.At last, A power factor correction test system is introduced based on TMS320LF2407A.The whole system can achieve close to unity power factor, lower current harmonics and constant output voltage. Experimental results indicate the feasibility of control scheme and the validity of theory analysis. Anticipation is realized.