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固定关断时间控制Buck变换器斜坡补偿技术及其机理研究

DOI: 10.13334/j.0258-8013.pcsee.2014.36.007, PP. 6426-6434

Keywords: 斜坡补偿,固定关断时间控制,等效串联电阻,离散映射模型,分岔

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Abstract:

当输出电容等效串联电阻(equivalentseriesresistance,ESR)较小时,固定关断时间控制(fixedoff-time,FOT)控制Buck变换器可能工作在不稳定的混沌状态。提出FOT控制Buck变换器的斜坡补偿技术,通过采样电感电流信息对输出电容电压进行电压斜坡补偿,实现了低ESR输出电容FOT控制Buck变换器的稳定工作。分析斜坡补偿的作用机理,给出确保变换器稳定工作时斜坡补偿电压斜率的临界值。建立斜坡补偿FOT控制Buck变换器的离散映射模型,研究斜坡补偿电压斜率作为分岔参数时斜坡补偿FOT控制Buck变换器的动力学行为。研究结果表明,斜坡补偿有效拓宽了变换器输出电容ESR的稳定工作范围,通过斜坡补偿技术,输出电容ESR较小时FOT控制Buck变换器也能稳定正常工作。实验结果验证了理论分析的正确性。

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