Ripple-Free Flyback Converter with Passive Pulsating Ripple Cancelling Circuit

In order to solve the problems caused by the pulsating current ripple of switching-mode power converters, a passive pulsating ripple cancelling circuit (PPRCC) is proposed in this paper. The features of the proposed PPRCC include simple, modular structure, and high degree of design flexibility. By integrating the proposed PPRCC, an input current ripple-free flyback-type converter is adopted and analyzed as an example because of its comprehensive utilization in small power rating commercial products. In addition, the switch voltage spike offlyback converter can be suppressed by integrating the proposed PPRCC without using snubbers, it turns out the efficiency can be further improved. The corresponding operating principle, steady-state analysis, and zero ripple design criteria of the proposed PPRCC are provided. Experimental results show that the resulting peak-to-peak input current ripple is reduced and improved the efficiency can be achieved. Citation: Sanju B, Sreehari S. "Ripple-Free Flyback Converter with Passive Pulsating Ripple Cancelling Circuit." Global Research and Development Journal For Engineering [ERTEE' 19], Adishankara Institute of Engineering and Technology, kalady, Kerala KTU(Kerala Technological University), (March 2019) : pp. 288 - 291.