一种开关管馈能式零电压软关断电路
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摘要
提出了一种开关管馈能式零电压软关断电路,由缓冲电路、储能电容和馈能电路构成。当开关管关断时,由缓冲电路中的缓冲电容实现开关管的零电压软关断;当开关管导通时,缓冲电容上的能量再通过一个谐振电路转移到储能电容。储能电容接受每次开关管开通时由缓冲电容上转移过来的能量,使电压逐步上升。当储能电容电压上升到阈值电压时,馈能电路工作,将储能电容的能量迅速转移到主电路的输出电容上,实现能量回馈。其次,分析了电路的工作原理和关键的器件设计方法。最后,搭建了一台实验样机,设计了控制电路,并验证了电路的有效性。
A zero-voltage soft-switching-off circuit with energy-feedback for switch transistor is proposed.It is composed of snubber circuit, energy storage capacitance and energy-feedback circuit. When switch transistor is turned off,the zero-voltage soft-switching-off is realized by the snubber capacitance of the snubber circuit. When switch transistor is turned on,the energy of the snubber capacitance is then transferred to the energy storage capacitance through a resonant circuit.The energy storage capacitance receives the energy transferred from the snubber capacitance when switch transistor turns on for each time,and its voltage gradually rises.When the voltage of the energy storage capacitance rises to the threshold voltage, the energy-feedback circuit operates, and the energy storage capacitance is quickly transferred to the output capacitance of the main circuit to realize energy feedback.Then, the working principle of the circuit and key component design methods are analyzed.Finally,an experimental prototype is built and the control circuit is designed.The validity of the circuit is verified.
A zero-voltage soft-switching-off circuit with energy-feedback for switch transistor is proposed.It is composed of snubber circuit, energy storage capacitance and energy-feedback circuit. When switch transistor is turned off,the zero-voltage soft-switching-off is realized by the snubber capacitance of the snubber circuit. When switch transistor is turned on,the energy of the snubber capacitance is then transferred to the energy storage capacitance through a resonant circuit.The energy storage capacitance receives the energy transferred from the snubber capacitance when switch transistor turns on for each time,and its voltage gradually rises.When the voltage of the energy storage capacitance rises to the threshold voltage, the energy-feedback circuit operates, and the energy storage capacitance is quickly transferred to the output capacitance of the main circuit to realize energy feedback.Then, the working principle of the circuit and key component design methods are analyzed.Finally,an experimental prototype is built and the control circuit is designed.The validity of the circuit is verified.
引文
[1]张成,胡亮灯.中高压大功率IGBT驱动器有源箝位技术研究[J].电力电子技术,2017,51(7):51-55.
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[2]胡望淼,肖岚,程德荣.用于微逆变器的有源箝位反激的一种控制策略[J].电力电子技术,2013,47(5):88-90.
[3]胡海兵,吴红飞,刘薇,等.一族有源钳位正激变换器[J].电工技术学报,2013,28(12):245-250,261.
[4]荆鹏辉,郑征,赵锋.新型高频隔离双向DC/DC变换器的特性分析[J].电力电子技术,2014,48(12):86-89.
[5]袁义生,伍群芳.ZVS三管推挽直流变换器[J].中国电机工程学报,2012,32(33):23-30,171.
[6]郭潇潇,舒泽亮,李祖勇,等.电力电子变压器中LLC谐振变换器的研究[J].电力电子技术,2017,51(10):50-53.