Lossless snubber for tapped-inductor boost converter for high step-up application

In order to suppress the switch voltage spike in the tapped-inductor boost (TIB) converter, a passive lossless snubber with minimum voltage stress is proposed. It consists of two capacitors and three diodes and takes advantage of the leakage inductance of the tapped-inductor. Moreover, it can readily be incorporated into an existing system since it does not modify the original TIB topology. The TIB converter employing the proposed snubber features zero current soft-switching of the switching devices, significantly relieved diode reverse-recoveries, and higher step-up ratio than the original TIB converter without a snubber. The proposed circuit is analyzed in detail, and some experimental results are also presented.