Analysis of a GaN-Based CRM Totem-Pole PFC Converter Considering Current Sensing Delay

Conference · Tue Oct 01 04:00:00 EDT 2019 · IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ECCE.2019.8912203· OSTI ID:1761741

Sun, Jingjing ^[1]; Strain, Nathan ^[2]; Costinett, Daniel ^[3]; Tolbert, Leon ^[3]

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1. University of Tennessee, Knoxville (UTK)
2. The University of Tennessee, Knoxville
3. ORNL

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1761741
• Conference Information: Journal Name: IEEE Energy Conversion Congress and Exposition (ECCE) Journal Volume: 2019
• Country of Publication: United States
• Language: English