This study reports a miniaturised discontinuous conduction mode (DCM) variable on-time (VOT) buck converter providing an output of 1.8 V in the input range of 3–12 V to support applications with large wireless coupling. Conventionally, an additional large capacitor has been used as a bootstrap capacitor to drive the high-side switch of buck converters, which prevents minimisation. In this study, a standalone momentary power consumption level shifter is proposed to remove the additional bootstrap capacitor and increase the power conversion efficiency (PCE) in the buck converter. A Zener diode is utilised to reduce the power consumption of the level shifter. In addition, a dead-time-based off-time calibration circuit is proposed to further increase the PCE by reducing the low-side conduction loss. The proposed circuit is fabricated with a TSMC 0.18-µm BCD process, and the core circuit occupies an active area of 0.68 mm ² with two external components. It provides output currents in the range of 20 µA to 3 mA with a maximum switching frequency of 750 kHz. The maximum efficiency of the converter below 5 mW is 80.2%.

中文翻译：

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具有基于死区时间的关断时间校准的自举式无电容器DCM VOT降压转换器，用于磁共振无线功率传输

这项研究报告了一种微型不连续导通模式（DCM）可变导通时间（VOT）降压转换器，在3-12 V的输入范围内提供1.8 V的输出，以支持具有大型无线耦合的应用。常规地，附加的大电容器已被用作自举电容器来驱动降压转换器的高端开关，这防止了最小化。在这项研究中，提出了一个独立的瞬时功耗电平转换器，以删除额外的自举电容器并提高降压转换器中的功率转换效率（PCE）。齐纳二极管用于降低电平转换器的功耗。另外，提出了一种基于死区时间的关断时间校准电路，以通过降低低侧导通损耗来进一步提高PCE。所提出的电路是用TSMC 0制造的。 ^2个，带有两个外部组件。它提供20 µA至3 mA的输出电流，最大开关频率为750 kHz。低于5 mW的转换器最大效率为80.2％。