改进型三绕组谐振升压变换器

Improved Resonant Boost Converter with Three-Winding Transformer

文中提出了一种改进型三绕组谐振升压变换器,一次侧采用有源钳位技术,抑制电压尖峰、实现主/辅开关管的ZVS及变压器的磁芯复位、提高变压器利用率.二次侧采用谐振软开关技术,实现二极管D 1和D 2的ZCS、消除反向恢复问题、降低开关损耗.高频变压器采用三绕组结构,正/反激模式交替导通,降低副边绕组电压应力,提高变换器整体效率.文中对该变换器的工作模态进行详细分析,给出主功率电路参数设计方法,最后搭建了400 W的仿真和实验平台,实验结果验证文中理论分析与设计的可行性.

In this paper,a improved resonant boost converter with three-winding transformer is proposed.The active clamping technology is adopted at the primary side,which not only suppress voltage spikes,but also provides zero-voltage turn-on switching and the core reset of transformer,thus the utilization of the transformer is improved.The resonant soft switching technology is used in the secondary side to achieve the zero-current turn-off switching of diodes,eliminate the reverse recovery problem and reduce the switching losses.Since the high frequency transformer adopts three-winding structure,the voltage stress of the secondary winding is reduced,and the forward-flyback mode is conducted alternately to improve the overall efficiency of the converter.The working mode of the DC-DC converter is analyzed in detail in this paper,and the design method of the main power circuit parameters is given.Finally,a 400W prototype is implemented,the experimental results verify the theoretical analysis and the feasibility of design of this paper.