ZVT-PWM Buck变换器的小信号建模及数字控制  

Small-signal Modeling and Digital Control of ZVT-PWM Buck Converter

作　　者：马聪[1] 王俊峰[1] 王凯[1] 陈瑾怡 MA Cong;WANG Jun-feng;WANG Kai;CHEN Jin-yi(Xi'an Microelectronic Technology Institute,Xi'an 710116,China)

机构地区：[1]西安微电子技术研究所,陕西西安710116

出　　处：《电力电子技术》2024年第5期129-132,共4页Power Electronics

基　　金：军委装备发展部重点领域基金(61409230310)。

摘　　要：首先介绍了零电压转换-脉宽调制(ZVT-PWM)Buck变换器的工作原理。接着采用等效可控源平均法推导出了变换器的小信号模型以及传递函数的表达式。对小信号模型分析表明,ZVT-PWM Buck变换器比传统Buck变换器的瞬态响应特性更好。然后依据该小信号模型,设计了数字控制器的参数。最后对原理样机进行测试,实测的功率级传递函数验证了小信号模型的正确性,闭环下的负载瞬态响应测试过冲电压为410mV,恢复时间为150μs,优于传统Buck变换器的负载瞬态响应特性。Firstly,the zero voltage transition pulse-width-modulation(ZVT-PWM)Buck converter's working principle is introduced.Secondly,the equivalent controlled source averaging method is used to derive the small-signal model and transfer functions.The model indicates that the ZVT-PWM Buck converter has faster transient response.Based on the small signal model,the digital control circuit parameters are designed.The prototype is tested and the Bode plot verifies the accuracy of the small-signal model.The closed-loop load step transient response is 410 mV overshoot voltage and 150μs recovery time,which is better than Buck converter.

关 键 词：变换器 零电压转换 小信号模型 等效可控源平均法 

分 类 号：TM46[电气工程—电器]