A Current-Driving Synchronous Rectifier for an LLC Resonant Converter With Voltage-Doubler Rectifier Structure
A Current-Driving Synchronous Rectifier for an LLC Resonant Converter With Voltage-Doubler Rectifier Structure
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DOI：
10.1109/tpel.2011.2167520
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发表时间：
2012-04
影响因子：
6.7
通讯作者：
Junming Zhang;Jiawen Liao;Jianfeng Wang;Z. Qian
中科院分区：
文献类型：
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作者：
Junming Zhang;Jiawen Liao;Jianfeng Wang;Z. Qian
提出了一种采用倍压整流的LLC谐振变流器中同步整流器的电流驱动方案。在该方案中，倍压整流器中只有一个电流互感器(CT)和一个二次绕组驱动两个开关磁阻。此外，来自CT的检测电流可以通过能量恢复电路馈送到输出。与传统的中心抽头整流器相比，减少了SR驱动电路的CT计数，节省了成本和空间。尽管倍压整流器中SR的额定电流增加了一倍，但额定电压得到了很好的降低，并且可以使用具有较低导通电阻的较低额定电压装置来补偿增加的额定电流。此外，在任何情况下，SR电压应力都能很好地钳制到输出电压，从而提高了电路的可靠性。搭建了输出电压为16 V/5.6 A的样机，验证了理论分析的正确性。
This paper proposes a current-driving scheme for a synchronous rectifier (SR) in an LLC resonant converter with a voltage-doubler rectifier. In the proposed scheme, only one current transformer (CT) with one secondary winding is used to drive two SRs in the voltage-doubler rectifier. Also, the sensed current from the CT can be fed to the output with an energy-recovery circuit. Compared to the conventional center-tapped rectifier, the CT count for the SR drive circuit is reduced, which saves both cost and space. Although the current rating of the SR in the voltage-doubler rectifier is doubled, the voltage rating is well reduced and a lower voltage rating device with lower ON-state resistance can be used to compensate the increased current rating. Furthermore, the SR voltage stress is well clamped to the output voltage under any condition which improves the reliability of the circuit. A prototype with 16 V/5.6 A output was built to verify the theoretical analysis.