低电压大电流软开关电源的设计
作者:张波 上传时间:2009/4/29 15:17:25
摘要:本文介绍了一种大功率低压大电流开关电源的设计方案,该电源满载输出功率为60kW(5000A/12V),采用软开关移相全桥控制方式,实现了零电压软开关;控制电路中采用了稳压稳流自动转换方案,实现了输出稳压稳流的自动切换,提高了输出性能;采用多个变压器串并联结构,使并联的输出整流二极管之间实现自动均流;设计并使用了容性功率母排,减小了系统中的振荡,减小了功率母排的发热,达到了令人满意的实验结果。
叙词:移相FB-PWM, 软开关, 无感功率母排, 变压器
Abstract:This paper presents one design of switching power supply which is high power, low voltage and high current, the full load output power of which is 60kW(5000A/12V). The strategy of phase-shifted soft-switch full-bridge control is applied in the power supply, which realizes zero-voltage soft switching. The control circuit adopts the strategy of automatic conversion with steady voltage and steady current, which results in the automatic shift of output steady voltage and steady current, thus improving the output quality. The power supply uses multi-transformer-series-parallel structure, which results in the automatic load sharing among each output rectifier diode that is paralleled. And the performance is observably improved by inductance-less power bus.
Keyword:shifting phase PWM, soft switching, inductance-less power bus, transformer
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