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发明公开
CN104734496A 一种SEPIC馈电升降压变换器 有权

一种SEPIC馈电升降压变换器
摘要：
本发明公开了一种SEPIC馈电升降压变换器，包括相互耦合的SEPIC电路、极性反转变换电路和控制器，SEPIC电路连接供电电源，SEPIC电路和极性反转变换电路通过控制开关相连接，极性反转变换电路连接负载，控制开关S1SBB闭合时，SEPIC电路将供电电源的电能存储于SEPIC电路和极性反转变换电路的储能耦合电感中，同时，储能耦合电容经所述极性反转变换电路向负载馈送电能；当控制开关断开时，所述供电电源经SEPIC电路向负载馈送电能的同时，分别由SEPIC电路和所述极性反转变换电路的储能耦合电感经SEPIC电路和极性反转变换电路向负载馈送电能，提高变换器的工作效率的同时能够实现变换器的输出续流，降低变换器输出EMI。
摘要（英）：

The invention discloses an SEPIC feed buck-boost converter comprising an SEPIC circuit, a polarity inversion converting circuit and a controller which are mutually coupled. The SEPIC circuit is connected with a power source. The SEPIC circuit and the polarity inversion converting circuit are connected through a control switch. The polarity inversion converting circuit is connected with a load. When the control switch SISBB is closed, the SPPIC circuit stores the electric energy of the power source in an energy storing coupled inductor of the SEPIC circuit and the polarity inversion converting circuit; meanwhile, an energy storage coupled capacitor feeds back electric energy to the load through the polarity inversion converting circuit. When the control switch is switched off, the power source feeds back electric energy to the load through the SEPIC circuit, and electric energy is fed back to the load by the energy storing coupled inductor of the SEPIC circuit and the polarity inversion converting circuit through the SEPIC circuit and the polarity inversion converting circuit. By the adoption of the SEPIC feed buck-boost converter, the work efficiency of the converter is improved, output follow current of the converter can be achieved, and the output EMI of the converter is reduced.

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