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采用阶梯波方式的高效开关线性复合包络线跟踪电源

, PP. 43-51

Keywords: 功率放大器,包络线跟踪,阶梯波方式,前馈控制

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Abstract:

针对开关频率对系统效率的影响和对提高跟踪频率的限制,提出一种采用阶梯波方式的高效SLHET电源,其优势在于每个开关管在一个跟踪周期内只需动作一次,与相同跟踪带宽下的其他现有方法相比,减小开关频率的同时还可以大幅降低输出电压谐波,从而提升开关变换器的效率。本文从基波拟合准确度和电压谐波角度详细分析了阶梯电平数及阶差的选择。同时采用输出电压全前馈实现开关变换器输出电流跟踪负载电流,避免线性放大器提供基波电流降低系统效率。最后搭建了一台跟踪频率为300kHz、输出电压为10~26V的正弦波,峰值输出功率为50W的ET电源原理样机,实验结果验证了理论分析的正确性,效率达到81.3%。同时,与两电平方式进行对比,实验结果表明阶梯波方式不仅能提高系统效率,还可获得更高跟踪带宽。

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