摘要
针对传统全桥ZVS PWM DC-DC变换器零电压开关范围窄、占空比丢失严重,转换效率较低等缺点,提出了一种新型的全桥ZVS PWM DC-DC变换器.在一次侧串入耦合电感和隔直电容,使变换器实现了较宽的输入电压和较大的带负载能力.分析了这种变换器的工作原理、零电压开关的实现,推导了耦合电感的选择依据.并且采用TMS320F240 DSP作为控制芯片,设计了变换器数字控制系统.通过一台功率为48 W,工作频率为100 kHz的样机验证了这种基于数字控制的新型PWM DC-DC变换器相关理论的正确性.
A traditional full bridge ZVS PWM DC -DC converter has several shortcomings, such as narrow range of ZVS, serious loss of duty and fairly low converting efficiency. A novel full bridge ZVS PWM DC - DC converter is proposed in this paper. We employ a coupled inductor and two blocking capacitors in the primary side, which makes the converter achieve wide input voltage and large load ability. This paper not only analyzes the operating principle of the converter and the realization of ZVS, but also deduces the selection of the coupled inductor. And a double closed loop power supply control system is designed based on a digital chip - a TMS320F240 DSP chip. The operation and the characteristics of the proposed converter is verified on a 48 W, 100 kHz prototype.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2006年第2期184-187,共4页
Journal of Harbin Institute of Technology
