The GaN-based critical conduction mode (CRM) totem-pole power factor correction (PFC) converter with full-line-cycle zero voltage switching (ZVS) is a promising candidate for high-efficiency front-end rectifiers. However, the input current can be degraded by line-cycle current distortion and ac line zero-crossing current spikes, and maintaining reliable ZVS control is difficult in noise-susceptible high-frequency environments. In this paper, a detailed analysis of the current distortion issues in a GaN-based CRM totem-pole PFC with digital ZVS control is provided, and effective approaches are proposed to mitigate different kinds of current distortion and ensure stable ZVS control under high-frequency operation. The proposed solutions have the advantages of straightforward implementation and do not increase the control complexity. The current distortion issues are demonstrated in two GaN-based CRM totem-pole PFC prototypes, a 1.5 kW PFC for data centers and a 100 W PFC in a 6.78 MHz wireless charging power supply for consumer electronics. The proposed methods are experimentally verified with effective mitigation of the current distortion and improvement of the converter power efficiency.

中文翻译：

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具有ZVS控制的基于GaN的CRM图腾柱PFC整流器的电流失真缓解

具有全线周期零电压开关（ZVS）的基于GaN的临界传导模式（CRM）图腾柱功率因数校正（PFC）转换器是高效前端整流器的有希望的候选者。但是，输入电流会因线路周期电流失真和交流线路过零电流尖峰而降低，并且在对噪声敏感的高频环境中难以维持可靠的ZVS控制。本文详细分析了具有数字ZVS控制的GaN基CRM图腾柱PFC中的电流畸变问题，并提出了有效的方法来减轻不同种类的电流畸变并确保在高频下稳定的ZVS控制手术。所提出的解决方案具有直接实现的优点，并且不会增加控制复杂度。当前的失真问题在两个基于GaN的CRM图腾柱PFC原型中得到了证明，一个用于数据中心的1.5 kW PFC和一个用于消费电子产品的6.78 MHz无线充电电源中的100 W PFC。通过有效减轻电流失真并提高转换器功率效率，对所提出的方法进行了实验验证。