Novel single-stage isolated power-factor-corrected power supplies with regenerative clamping

Single-stage isolated power-factor-corrected power supplies (SSIPPs) have the attractive features of fast regulation and a single control loop. In this paper, we further propose to add a very simple regenerative clamping circuit to an SSIPP to reduce the voltage stress and to recycle the energy trapped in the leakage inductance of the isolation transformer, thus eliminating the need for a lossy snubber circuit. In addition, the proposed clamping circuit also improves the power factor of the SSIPP, employing a boost converter as the input stage. Analysis and experimental results are reported to verify the operation and performance of the SSIPP with regenerative clamping.