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

Single-stage isolated power-factor-corrected power supplies (SSIPP) have the attractive feature of fast regulation and single control loop. In this paper we further propose to add a very simple regenerative clamping circuit to 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, this proposed clamping circuit also provides a mechanism to reset the magnetizing current of the output transformer of SSIPP employing a forward converter as the output stage. Simulations and experimental results are reported to verify the operation and performance of the SSIPP with regenerative clamping.