Mitigation of Current Distortion for GaN-Based CRM Totem-Pole PFC Rectifier With ZVS Control

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Abstract
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.
Funding Information
  • Office of Energy Efficiency and Renewable Energy
  • U.S. Department of Energy (DE-EE0006521-012, DE-EE0007304)
  • Intel Cooperation
  • Engineering Research Center Shared Facilities
  • Engineering Research Center Program
  • National Science Foundation (EEC-1041877)
  • CURENT Industry Partnership Program
  • National Science Foundation

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