Analysis of a GaN-Based CRM Totem-Pole PFC Converter Considering Current Sensing Delay
Analysis of a GaN-Based CRM Totem-Pole PFC Converter Considering Current Sensing Delay
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DOI：
10.1109/ecce.2019.8912203
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Jingjing Sun;Nathan N. Strain;D. Costinett;L. Tolbert
中科院分区：
文献类型：
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作者：
Jingjing Sun;Nathan N. Strain;D. Costinett;L. Tolbert
基于高频软开关氮化镓 (GaN) 的临界传导模式 (CRM) 图腾柱功率因数校正 (PFC) 转换器是数据中心电源中最有潜力的候选者之一。然而，高速逐周期零电流检测（ZCD）给零电压开关（ZVS）控制带来了挑战。存在电流检测延迟 (CSD)，并且 ZCD 电路对高 di/dt 开关噪声敏感。本文详细阐述了 ZCD 时间误差的机制，并分析了电流检测延迟对转换器开关频率、电感电流、输入电流三次谐波失真 (THD) 和功率损耗的影响。在控制器内添加了限定时间，以免受开关噪声的影响，并提出了 CSD 嵌入式转换器模型来补偿 ZCD 时间延迟。此外，还对 CRM 图腾柱 PFC 进行损耗建模，以帮助分析所提出的理论。测试了 1.5 kW 单相 CRM 图腾柱 PFC 原型。实验结果验证了分析、建模和所提出的电流检测延迟补偿方法。
High-frequency soft-switched gallium-nitride (GaN) based critical conduction mode (CRM) totem-pole power factor correction (PFC) converter is one of the most potential candidates in data center power supplies. However, the high-speed cycle-by-cycle zero current detection (ZCD) brings challenges to zero-voltage-switching (ZVS) control. Current sensing delay (CSD) exists, and the ZCD circuit is sensitive to high di/dt switching noise. In this paper, mechanisms of the ZCD time error are elaborated, and impacts of the current sensing delay on converter switching frequency, inductor current, input current third harmonic distortion (THD), and power loss are analyzed. Qualification time is added within the controller for immunity to the swiching noise, and a CSD embedded converter model is proposed to compensate the ZCD time delay. Also, loss modeling of the CRM totem-pole PFC is conducted to aid in analysis of the proposed theory. A 1.5 kW single-phase CRM totem-pole PFC prototype is tested. Experimental results validiate the analysis, modeling, and the proposed compensation method for current sensing delay.