【作者】 唐春森； 沈昊；

【Author】 Tang Chun-Sen,Shen Hao College of Automation,Chongqing University,Chongqing 40044,China

【机构】 重庆大学自动化学院；

【摘要】 本文针对准谐振电路实现软开关功能以及输出电压稳定的问题,提出了一种双闭环控制的方法。该方法是以开关管端电压的过零信号作为内环控制参考信号来决定开关管关断时间以实现软开关功能,以输出电压与参考电压的误差作为外环控制输入信号来调整开关管导通时间以实现输出稳压功能。文中以BUCK零电压准谐振变换器(ZVS-QRC)为例,对该方法的原理及实现方案进行了研究,并通过仿真和实验验证了其有效性。该控制技术可推广应用于其他准谐振DC/DC变换电路。更多还原

【Abstract】 To achieve the soft-switching condition and stabilize the output voltage of quasi-resonant converter,the paper proposes a double closed-loop control method.In the inner loop,soft-switching is guaranteed with the off-time of the switch determined by the zero-crossing signal of the switching voltage.In the outer loop,the output voltage is regulated to be constant against load variations by controlling the on-time of the switch according to the error between the output voltage and the reference voltage.The operation principle and implementation of the proposed method have been investigated in detail on an example BUCK zero-voltage-switching quasi-resonant converter.Both simulation and experiment results have verified the validation of the proposed method.The control technology can be further applied in other quasi-resonant DC/DC converters.更多还原