摘要
为克服经典的Boost变换器升压比低、输入电流纹波大、功率器件电压应力高等缺点,提出了一种新型的零输入电流纹波高增益非隔离DC/DC变换器。将隔离型Sepic变换器、耦合电感型高增益变换器、无源纹波电路单元三者相结合,在提升变换器电压增益的同时,还能够实现输入电流纹波为零的特性,且实现该特性的条件不受占空比影响。同时引入钳位电路,有效吸收了漏感中储存的能量,削弱了开关管漏、源极在关断时产生的电压尖峰。讨论了变换器在电流连续模式下的工作原理,给出了此模式下电压增益、电压应力等稳态特性的数学方程,最后制作了一台500 W的实验样机,验证了理论分析的正确性以及所提变换器的可行性。
In order to overcome the shortcomings of the classic Boost converter,such as low boost ratio,large input current ripple,and high voltage stress of power devices,a new type of zero input current ripple high gain nonisolated DC/DC converter was proposed.The combination of isolation type Sepic converter,coupled inductor type high-gain converter and passive ripple circuit unit can improve the voltage gain of the converter while also achieving the characteristics of zero input current ripple.The condition of the characteristic is not affected by the duty cycle.At the same time,the introduction of a clamping circuit effectively absorbed the energy stored in the leakage inductance,and weakened the voltage spikes generated by the drain and source of the switch tube when it was turned off.The working principle of the converter in continuous current mode was discussed,and the mathematical equations of steady-state characteristics such as voltage gain and voltage stress in this mode were given.Finally,a 500 W experimental prototype was made to verify the correctness of the theoretical analysis and feasibility of the proposed converter.
作者
刘文琪
丁稳房
LIU Wenqi;DING Wenfang(School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China)
出处
《电气传动》
2022年第20期31-36,56,共7页
Electric Drive
基金
湖北省技术创新专项重大项目(2019AAA018)。
