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开关型稳压电路近年来广泛应用的新型稳压电源是开关型稳压电源。它的调整管工作在开关状态，本身功耗很小，所以有效率高、体积小等优点，但电路比较复杂。开关稳压电源从原理上分有很多种。它的基本原理框图见。图中电感L和电容C是储能和滤波元件，二极管VD是调整管在关断状态时为L、C滤波器提供电流通路的续流二极管。开关稳压电源的开关频率都很高，一般为几～几十千赫，所以电感器的体积不很大，输出电压中的高次谐波也不多。