摘要
传统的推挽变换器存在着一些固有的缺点,诸如开关管的电压应力高、难以实现软开关等,限制了它的应用范围。该文提出了一种零电压开关PWM推挽三电平变换器,该变换器中开关管的电压应力为输入直流电压。该变换器采用移相控制,所有开关管实现零电压开关。文中讨论了超前管和滞后管实现ZVS的异同,分别给出了超前管和滞后管实现ZVS的条件以及副边占空比丢失的原因及其计算公式,最后通过1个开关频率为100kHz,额定输入电压为300V、输出功率为540W的原理样机验证了该变换器的工作原理。实验表明,所提出的变换器克服了传统推挽变换器一些固有的缺点,扩大了其应用范围。
There are some intrinsic drawbacks in traditional push-pull converter, such as higher voltage stress and hard-switching of the switches, so the application area of the converter is limited. In this paper, a new topology of zerovoltage-switching PWM push-pull three-level converter is proposed, in which the voltage stress of switches is input voltage. Phase shifting modulation strategy is applied to the converter, under which the switches are realized zero-voltageswitching. The conditions are given respectively, which the converter is realized zero-voltage-switching for the leading switches and the lagging switches. The principle of the converter are analyzed and verified on an experimental prototype operating at 100kHz, rated at 300V input voltage, and 540W output power. Experiment results indicate that the intrinsic drawbacks of the traditional push-pull converter are overcome, and the application area of the new converter is widened.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第23期36-41,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(50177013)
中航一集团航空基金项目(05F52039)。~~
关键词
推挽变换器
零电压开关
三电平
脉宽调制
push-pull converter
zero-voltage-switching
three-level
pulse width madulation
