Constant ON-time 3-level buck converter for low power applications

B. Cassidy, D. Ha, Qiang Li
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引用次数: 6

Abstract

Car black boxes operate mostly in sleep mode, which requires high efficiency for light load. We propose two schemes to improve light load efficiency of the 3-level buck converter proposed by Reusch. The first scheme is to adopt constant ON-time control with DCM for light load. The second scheme is to shut down the gate drivers for the two bottom MOSFETs allowing Schottky diodes in parallel to conduct the inductor current, in the very light load condition. The proposed converter is prototyped using off-the-shelf components. The efficiency of the proposed 3-level buck converter ranges from 82% to 95% at 100 mW and 5 W, respectively.
用于低功率应用的恒通时3电平降压转换器
汽车黑匣子大多处于休眠模式,对轻载效率要求很高。我们提出了两种方案来提高Reusch提出的3电平降压变换器的轻载效率。第一种方案是对轻载采用DCM恒通时控制。第二种方案是关闭两个底部mosfet的栅极驱动器,允许肖特基二极管并联传导电感电流,在非常轻的负载条件下。所提出的转换器使用现成的组件进行原型设计。所提出的3电平降压变换器在100mw和5w时的效率分别为82%到95%。
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