access icon free Improved active clamped ZVS buck converter with freewheeling current transfer circuit

© The Institution of Engineering and Technology
Received 14/03/2018, Accepted 28/01/2019, Revised 20/01/2019, Published 29/01/2019

An improved active clamped zero-voltage switching (ZVS) buck converter with freewheeling current transfer circuit is proposed in this study. Comparing with the traditional active clamped ZVS buck converter, the current of freewheeling diode, the clamping voltage and duty cycle loss are all halved. The reduced current and voltage stress will result in high reliability and efficiency. Moreover, the reduced duty cycle loss will result in a low input voltage. In the improved converter, a small inductor and an auxiliary diode are added to build the freewheeling current transfer circuit. The operating principle of the improved converter is described. The analysis and design considerations of the proposed converter are given. A 1.2 kW prototype converter is set up to validate the improved converter.

Inspec keywords: switching convertors; zero voltage switching; power semiconductor diodes; power inductors

Other keywords: inductor; freewheeling diode; freewheeling current transfer circuit; reduced voltage stress; clamping voltage; kW prototype converter; reduced current stress; improved active clamped ZVS buck converter; auxiliary diode; reduced duty cycle loss; power 1.2 kW; low input voltage; improved active clamped zero-voltage switching buck converter

Subjects: Junction and barrier diodes; Power semiconductor devices; Transformers and reactors; Power convertors and power supplies to apparatus

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