一种新型正激零电压零电流转换PWM DC/DC变换器

A Novel Forward DC/DC Converter with ZCZVT

提出一种新型的零电压零电流转换(ZCZVT)的正激拓扑。拓扑工作频率为300kHz,能实现主开关管的零电压开通(ZVS)和零电流关断(ZCS),同时辅助开关管也能实现零电流关断(ZCS),且变压器的磁通复位不需要辅助绕组。文章进行了拓扑的稳态分析,并且讨论了谐振电路的参数设计。最后,在研制一台48V输入、12V/100W输出样机的基础上,实验验证这种新型正激ZCZVT PWM DC-DC变换器的软开关特性。

A novel zero current-zero-voltage transition （ZCZVT） forward converter is presented in this paper. The proposed converter is operating at 300 kHz and processes the features of both zero- voltage transition （ZVT） at turn on and zero-current transition （ZCT） at turn off for the main switch. The auxiliary switch also achieves zero- current switc hing （ZCS）. The flux of transformer can be reset without tertiary winding. The steady- state analysis and design considerations are investigated in detail in this work. For 48 V input and 12 V 100 W output, a prototype of the proposed converter for 300 kHz switching is built to verify the theoretical analysis of soft switching.