Owing to their merits including continuous input and output current,high efficiency and high power density,non-isolated Superboost converters are widely applied in spacecraft power systems.However,the switching loss of the device will increase in a scenario with a high step-up ratio,resulting in a decrease in the converter efficiency.To solve this problem,a zero-voltage switching pulse-width modulation(ZVS-PWM)Superboost converter with low voltage stress is proposed.By introducing a resonant tank,the main switch can be turned on or off under ZVS,and the auxiliary switch can be turned on under zero current switching and turned off under ZVS.Besides,all the diodes are operating under soft-switching.As a result,the switching loss is reduced effectively,and the converter efficiency is improved without increasing the voltage and current stress of the main power device.The operation principle,soft-switching conditions and device stress are analyzed in detail,and the state-space averaging approach is used to estimate the steady-state and dynamic characteristics of the proposed converter.In addition,its feasibility was verified by a prototype with 100 kHz and 400 W.
关键词
软开关/Superboost变换器/低电压应力/直流-直流变换器
Key words
Soft-switching/Superboost converter/low voltage stress/DC-DC converter
维普
万方数据