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具有输出短路保护能力的DC-DC换流器控制方法研究

, PP. 292-297

Keywords: DC-DC,短路能力,恒流源,小信号建模

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Abstract:

由于经济、技术等方面的优势,直流换流器已得到了广泛的应用,并且还将进一步发展。Boost升压电路自身没有限流能力。Buck降压电路输出侧有电感存在,因此具备一定的限流能力。本文提出一种具有输出短路保护能力的DC-DC换流器控制方法,将Boost-Buck背靠背结构的换流器通过合理的控制,使其具有很好的负载短路特性。通过电压电流双闭环控制实现正常工作状态下的恒压源输出,当负载短路时,通过采样输出电感电流做闭环控制,使换流器工作于恒流源状态,使其具备短路保护能力。系统的仿真分析和实验结果证明Boost-Buck换流器利用提出的控制方法具备了良好的负载短路特性。

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