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本文提出了一种适用于宽输入范围（12V至100V）的自平衡零电压开关（ZVS）三电平DC-DC稳压器，采用恒定频率自适应导通时间（AOT）V2控制，实现了2MHz开关频率和90%的高效率。该设计解决了传统高频高压DC-DC变换器中开关损耗大、效率低的问题，适用于汽车和工业系统。
Wide input rails (12V to 100V) are common in today’s automotive and industrial systems. Miniaturized DC-DC voltage regulators (VRs), which can provide a lowvoltage regulated output from a wide input range and deliver a few Watts, are essential in these systems. Wide-input-range integrated VRs, however have difficulty to simultaneously achieve high frequency (HF) operation and high power efficiency. Previous hard-switching (HS) high-input-voltage (HV) buck regulators can only operate at a low frequency of 100s of kHz in order to limit the dominant switching power loss PSW, that occurs at the converter switching node [1,2]. Lowfrequency operation however results in using bulky inductors of 100s of μH, significantly increasing the bill-of-material cost and the converter volume. Threelevel converters (TLCs) are effective to reduce the required inductance by doubling the frequency at the switching node and allow using lower-voltage-rating power
Jing Xue, Hoi Lee
University of Texas, Dallas, TX