PWM 방식 벅 컨버터의 빠른 과도응답 기술
Fast Transient Response Techniques for PWM Buck Converter
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초록
PWM 벅 컨버터는 3형 오차 보상기를 주로 사용하고 있다. 이 오차 보상기는 낮은 슬루율을 갖게 하는 큰 커패시터로 인해, 부하 전류의 과도응답이 발생하였을 때 부하 전압에 의도하지 않은 큰 오버슈트와 언더슈트를 발생시킨다. 또한 기준전압을 변화시켰을 때의 변화에도 느리게 응답한다. 전원장치의 효율적인 사용을 위해 다양한 부하 전류와 전압이 요구되고 있고, PWM 벅 컨버터 역시 부하 전류 변화와 기준 전압 변화에 따른 부하 전압의 빠른 응답특성을 가져야 한다. 본 논문은 PWM 벅 컨버터의 응답시간을 늘이기 위한 여러 가지 빠른 과도응답 기술들의 동작 방식과 이들 방법이 갖고 있는 장점, 한계점들을 소개한다.
Abstract
PWM buck converters usually use a type-III error amplifier. Since this amplifier has a big capacitor with slow slew rate, they can generate an unintended large overshoot/undershoot at the output when a large load current change occurs. They can also respond slowly by varying the reference voltage. In order to increase battery lifetime, power supplies require a various range of load current and output voltage. PWM buck converter also should have a characteristic of both fast load response and reference tracking. This paper surveys a few recent techniques for reducing the settling time, and discusses their merits and limitations.
참고문헌 (11)
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