一种快速响应高效多模式升压降压型转换器

Rapidly transient response with the flexible mode and high-efficiency buck-boost converter

描述了一种新颖的高效多工作模式可快速响应的电流模升压降压型转换器.转换器有灵活的工作模式,电路可以根据输入电压和电感电流的变化来选择工作模式,并且各种工作模式可以平稳转换.平均电流感应模块可以很精确地量测出电感电流.负载瞬态响应时间较其他转换器有降低.这款电流模转换器使用Silterra 0.18μm CMOS工艺流片.实验结果显示,在4.2V输入电压、1A负载电流条件下,转换器的最大效率达95%,因此,使用该转换器可以延长供电电池使用寿命.输出从空载到2A切换时,输出电压变化为6mV,恢复时间为60μs.

A novel current sensing technique with a rapidly transient and flexible mode buck-boost converter is presented. The converter can work in an appropriate mode according to the input voltage （VIN） and inductor current （IL）, with smooth transition and flexible working modes achieved. The average current sensing （AVCS） circuit has an accurate measurement of IL. The transient response time is also decreased. The current sensing converter is implemented in the Silterra 0. 18 μm COMS process. Experimental results show 95% peak efficiency at an output current 1 A with 4, 2 V VIN, so that the converter can extend the battery life. The output transient with the load current altering from 0 to 2 A is 6 mV and the recovery time is 60 μs.