【摘要】 提出一种倍流整流输出半桥串联混合式直流变换器,主开关管的电压应力低于输入电压,并在满载时均为输入电压的50%。由于采用了移相ZVSPWM控制并利用输出滤波电感中的能量,因此能够在宽负载范围内实现超前管的ZVS;而轻载时滞后管能实现ZCS,重载时能够完全零电压关断,但不能零电压开通,次级有效占空比丢失小,并实现了输出整流二极管的零电压关断。分析了该变换器的工作原理和工作特性,并通过一个240W(输出24V/10A)的原理样机进行了验证,最后给出了实验结果。更多还原

【Abstract】 This paper proposes a half-bridges-in-series hybrid converter with current doubler rectifier.The voltage stress of each main switch is only half of the input voltage.Whereas the Zero-Voltage-Switching(ZVS) for each lead-leg switch is achieved under wide load range by using the PSC PWM and the energy stored in the output inductances,the lag-leg switches commutate with ZCS at light load but can′t achieve ZVS at hard load.The secondary effective duty cycle loss is small.The output rectifier diodes commutate under zero-voltage condition.The principle and characteristics of the proposed converter are analyzed and verified on a 240W(24V/10A output) experimental prototype.The experimental results are given in the end.更多还原