科研之友
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摘要
The output power requirement of battery charging circuits can vary in a wide range, hence making the use of conventional phase shift full bridge DC-DC converters infeasible because of poor light load efficiency. In this paper, a new ZVS-ZCS phase shift full bridge topology with secondary-side active control has been presented for battery charging applications. The proposed circuit uses 2 extra switches in series with the secondary-side rectifier diodes, operating with phase shift PWM. With the assistance of transformer's magnetizing inductance, the proposed converter maintains zero voltage switching (ZVS) of the primary-side switches over the entire load range. The secondary-side switches regulate the output voltage/current and perform zero current switching (ZCS) independent of the amount of load current. The proposed converter exhibits a significantly better light load efficiency as compared with the conventional phase shift full bridge DC-DC converter. The performance of the proposed converter has been analyzed on a 1-kW hardware prototype, and experimental results have been included.
- 出版日期2018-7
