基于磁放大器的半桥LLC变换器输入电压范围扩展方法

doi:10.19595/j.cnki.1000-6753.tces.171490

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Abstract An improved half-bridge LLC converter with magamp auxiliary post-regulator is proposed in this paper. The function of magamp is disabled when the converter works within low input-voltage range, whereas it operates as an auxiliary post-regulator when the input-voltage is high. By changing the magamp’s blocking time, the DC gain of the converter can be extended accordingly. Hence, the input-voltage range of the converter is extended. The generalized operational principle is analyzed and the design criterion for the magamp is presented. Finally, a 25 V output, 400 W experimental prototype was built and tested for a 160-300 V input-voltage range to verify the theoretic and feasibility of the proposed method.

Key words： LLC converter resonance wide-range magamp

Received: 31 October 2017 Published: 12 November 2018

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TM46

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171490 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I21/5026

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