Single-input high-reliability Boost DC-DC converter

The invention discloses a single-input high-reliability Boost DC-DC converter. The converter comprises a basic Boost converter and m forward expansion units, the forward expansion unit is composed of two inductors, two capacitors, a switch tube and a diode. By adjusting the number of the forward expansion units, the input and output gains of the converter and the voltage stress of the switching device can be adjusted. The converter has the advantages of being simple in control and drive circuit, wide in input and output voltage adjusting range and high in reliability, and when one switch tube of the forward expansion unit is damaged, other circuits can work normally; and the change range of the output input voltage and the output voltage is relatively large. 一种单输入高可靠性Boost DC-DC变换器，该变换器包含一个基本Boost变换器，m个正向扩展单元。正向扩展单元由两个电感、两个电容、一个开关管、一个二极管所构成。通过调节正向扩展单元的个数，即可实现对变换器输入输出增益及开关器件电压应力的调节。该变换器具有控制及驱动电路简单、输入输出电压调节范围宽、可靠性高的特点，在正向扩展单元其中一个开关管损坏时，其余电路能正常工作；较适合于输出输入电压与输出电压变化范围比较大。