멀티비트 플라잉 커패시터의 전압제어를 이용한3-레벨 벅 변환기
Three Level Buck Converter Utilizing Multi-bit Flying Capacitor Voltage Control
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본 논문은 멀티비트 플라잉 커패시터의 전압제어를 이용한 3-레벨 벅 변환기를 제안한다. 기존의 3-레벨 벅 변환기는 플라잉 커패시터 전압을 제어하지 못하여 동작이 불안정하거나 플라잉 커패시터 전압을 제어하는 회로가 PWM방식에 적용되지못하는 문제가 있었다. 또한 부하전류에 증가할 때 인덕터 전압에 오차가 발생하였다. 본 논문에서 제안하는 구조는 입력이 4개인 차동증폭기와 공통모드 피드백 회로를 이용하여 PWM모드에서 플라잉 커패시터 전압을 제어할 수 있다. 또한 3비트 플라잉 커패시터 전압 제어회로를 제안하여 부하전류에 따른 3-레벨 벅 변환기의 동작을 최적화할 수 있으며 슈미트 트리거 회로를 이용한 삼각파 생성 회로를 제안하였다. 제안하는 3-레벨 벅 변환기는 0.18μm CMOS 공정으로 설계되었으며 2.7∼3.6V의 공급 전압 범위와 0.7V∼2.4V의 출력 전압 범위를 갖는다. 동작 주파수는 2MHz, 부하전류 범위는 30mA∼500mA이며 출력전압 리플은 최대 32.5mV로 측정되었다. 측정 결과 130mA의 부하전류에서 약 85%의 최대 전력변환 효율을 보인다.
Abstract
This paper proposes a three level buck converter utilizing multi-bit flying capacitor voltage control. The conventionalthree-level buck converter can not control the flying capacitor voltage, so that the operation is unstable or the circuit forcontrolling the flying capacitor voltage can not be applied to the PWM mode. Also when the load current is increased, anerror occurs in the inductor voltage. The proposed structure can control the flying capacitor voltage in PWM mode byusing differential difference amplifier and common mode feedback circuit. In addition, this paper proposes a 3bit flyingcapacitor voltage control circuit to optimize the operation of the three level buck converter depending on the load current,and a triangular wave generation circuit using the schmitt trigger circuit. The proposed 3-level buck converter is designedin 0.18μm CMOS process and has an input voltage range of 2.7V∼3.6V and an output voltage range of 0.7V∼2.4V. Theoperating frequency is 2MHz, the load current range is 30mA to 500mA, and the output voltage ripple is measured up to32.5mV. The measurement results show a maximum power conversion efficiency of 85% at a load current of 130 mA.
참고문헌 (8)
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