一种新型混合4:1降压变换器采用自耦变压器与直流绕组电流

Cheng Li, D. Serrano, J. Cobos
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引用次数: 3

摘要

这项工作提出了一种针对4:1固定比和高输出电流应用的非隔离混合拓扑。这种拓扑结构可以看作是开关电容和自耦变压器的紧凑集成。开关电容软充电,自耦变压器的两个绕组电流自动平衡。变压器具有准直流电流,交流绕组损耗可以忽略不计。为了进一步研究该电路中变压器的性能,对变压器进行了不同电流波形的仿真,结果表明,在准直流电流下,绕组损耗不随开关频率的增加而增加,至少比正弦波或方波电流产生的损耗低两倍。该电路在24V-6V降压下测量,输出电流高达25A,峰值效率达到96.7%。同一台变压器也在全桥试验台进行测试,通过测量其温度来比较绕组损耗与方电流。
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A Novel Hybrid 4:1 Step Down Converter Using an Autotransformer with DC Winding Current
This work presents a non-isolated hybrid topology targeting at 4:1 fixed ratio and high output current applications. This topology can be regarded as a compact integration of switched capacitor and autotransformer. The switched capacitors are soft charged and the two winding currents in the autotransformer are auto balanced. The transformer has quasi-DC current with negligible AC winding losses. To further study the performance of the transformer in the proposed circuit, the transformer is simulated with different current waveforms, and the results show that with quasi-DC current the winding losses do not increase with switching frequency, and they are at least two times lower than the losses generated from sinusoidal or square current. The proposed circuit is measured at 24V-6V step-down and up to 25A output current, achieving 96.7% peak efficiency. The same transformer is also tested in a full bridge testbench to compare winding losses with square current by measuring its temperature.
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