This paper proposes a generic zero-voltage switching (ZVS) scheme for parallel power MOSFETs. Uncoupled or inversely-coupled differential-mode (DM) commutation inductors are added to the midpoints (AC terminals) of parallel MOSFET half-bridges (HBs), and a time-delay-based control scheme is applied, generating a circulating current flowing through these commutation inductors. Thus, the inductor currents are reshaped as quadrilaterals, which enable all the parallel transistors to achieve ZVS. The mode of operation of the proposed paralleling technique is entitled quadrilateral current mode (QCM) due to the quadrilateral-shaped commutation inductor currents. The operating principle of the QCM-paralleling technique is detailed mathematically, yielding accurate closed-form analytical expressions for modulation parameters. Finally, simulations and experimental results of a QCM-enabled synchronous Buck dc-dc converter are presented to validate the theoretical considerations.

中文翻译：

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用于零电压开关 (ZVS) 的功率 MOSFET 的四边形电流模式 (QCM) 并联

本文提出了一种用于并联功率 MOSFET 的通用零电压开关 (ZVS) 方案。在并联 MOSFET 半桥 (HB) 的中点 (AC 端子) 添加非耦合或反耦合差模 (DM) 换向电感器，并应用基于时间延迟的控制方案，产生流过的循环电流这些换向电感器。因此，电感电流被重新整形为四边形，这使得所有并联晶体管都能实现 ZVS。由于四边形换向电感器电流，所提出的并联技术的操作模式被称为四边形电流模式 (QCM)。QCM 并行技术的工作原理在数学上进行了详细说明，从而为调制参数生成准确的封闭式解析表达式。最后，