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There are mainly two existing loop gain measurement methods, which are the modulating signal perturbation method (MSPM) and the pulse-width signal perturbation method (PSPM). This paper points out that there are differences between these methods, and the loop gain measured by the PSPM can be more easily used in the guidance of the controller design. Since the circuit implementation of the PSPM is...
By using an active snubber, a novel implementation of the zero-voltage transition (ZVT) semi bridgeless boost power factor correction (PFC) converter is proposed. The active snubber reduces the reverse-recovery-related losses of the boost diodes and also provides zero-voltage switching (ZVS) for the main switches in the proposed converter. Furthermore, the auxiliary switch is operated at soft switching,...
A family of isolated buck–boost dc/dc converter for wide input-voltage range is proposed in this paper, and the full-bridge (FB) boost converter, being one of the typical topologies, is analyzed. Due to the existence of the resonant inductor (including the leakage inductor), the FB-boost converter can only adopt the two-edge-modulation (TEM) scheme with the FB cell being leading-edge modulated and...
A family isolated Buck-Boost converter is proposed in this paper, and FB-Boost converter is analyzed as one of the typical topologies. An improved two-edge modulation strategy is proposed to minimize the inductor current ripple over the input voltage range. In order to improve the efficiency and reliability of FB-Boost converter, three-mode control scheme is proposed in this paper, according to the...
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