A Partial-Resonant Tapped-Inductor High Step-Down DC-DC Converter with an Auxiliary Switch

Kimihiro NISHIJIMA  

B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)   Vol.J101-B   No.3   pp.245-253
Publication Date: 2018/03/01
Online ISSN: 1881-0209
Type of Manuscript: PAPER
tapped-inductor,  active-clamp,  current-resonant,  ZCS,  low voltage and high current,  microprocessor,  

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A partial-resonant tapped-inductor converter with an auxiliary switch is proposed. The circuit construction is the same as a conventional tapped-inductor converter with active clamp circuit, but the drive timing for the auxiliary switch is different from the conventional one. Accordingly, zero current switching of the synchronous rectifier switch is achieved by a partial resonant between an auxiliary capacitor and the leakage inductance of the tapped-inductor during the on period of the auxiliary switch. Furthermore, the output stability is improved as compared with the conventional active clamp one. The operating and performance of the proposed approach were verified experimentally by a laboratory prototype of 24V input to 1.0V output at 600kHz. As a result, 1.5% improvement of efficiency is achieved.