一种新颖的磁耦合式无源无损吸收电路  

New Lossless Snubber Using Magnetism Coupling

作　　者：邓衍平[1] 谢运祥[1] 陈坤鹏[1] 龚臣[1] 

机构地区：[1]华南理工大学,广东广州510640

出　　处：《电力电子技术》2005年第1期51-52,69,共3页Power Electronics

摘　　要：文中利用磁耦合原理,将变换电路中的电感改为耦合电感,在耦合电感的二次绕组上获得一个受开关管控制的电压源,为开关管创造准谐振软开关条件。为此,提出了一种新颖的磁耦合式无源无损吸收电路,将其应用于Boost电路中,并详细分析了该电路的工作原理。计算机仿真和实验结果表明,采用这种吸收电路后,开关管能够实现零电流开通和零电压关断,减小了关断损耗,提高了电路的总体效率,尤其是在重载情况下,增加吸收电路可以使变换器效率提高8%左右。In order to eliminate the loss of the conventional RCD(resistor, capacitor and diode),a new lossless snubber using magnetism coupling is introduced.This circuit does not exist the loss of the resistor, so it is helpful to evaluate the whole efficiency.The working principle of the snubber is analyzed in detail, and is verified by the results of the computer simulation and experiment.The switch can turn on at zero current and turn off at zero voltage.The total efficiency has been improved, especially at heavy load, it is improved about 8% than the same circuit without such snubber.

关 键 词：吸收 电路/升压电路 软开关 无损吸收 磁耦合 

分 类 号：TN713[电子电信—电路与系统]