1. Interleaved AC-DC CRM PFC Converter
Mason Fennel1, Xingxuan Huang2, Jingjing Sun2, Dr. Leon Tolbert2
1 University of South Carolina 2 The University of Tennessee, Knoxville
INTRODUCTION
DC-DC boost converters extend battery life, increase output voltage and save space for design
AC-DC converters are known as rectifiers, where an oscillating voltage is converted into a constant voltage
Converting AC to DC can result in undesirable losses in efficiency, power factor (PF) and an increased total harmonic distortion (THD)
Power Factor Correction (PFC) converters maintain a PF of just below 1 (~ ) and minimize THD to improve power quality
This design implements a single phase bridgeless totem-pole configuration with GaN HEMTs for switching with a goal of 99% efficiency with an input voltage of 277V AC and an output voltage of 450V DC
Figure 1. TIDA kW High Efficiency Digital Power Factor Converter (PFC) [2]
DESIGN
48V DC stepped up to 120V DC
DC-DC boost converter with voltage control loop
DC-DC boost converter open loop
2-layer PCB schematic of capacitive load bank
Plot of output voltage vs. time for open loop boost converter
Plot of output voltage vs. time for closed loop boost converter
CONCLUSION AND FUTURE GOALS
Bridgeless totem-pole configuration with GaN HEMTs indicates high efficiency of approximately 99% [1].
Contributions to date
PCB design for capacitive load bank to reduce output voltage ripple
Simulation of DC-DC boost converter implementing voltage control loop
Future contributions
Population and testing of capacitive load bank
Simulation of totem-pole AC-DC PFC converter implementing voltage and current control loops
Construction and testing of PFC converter to achieve experimental results and compare to simulated results
REFERENCES
[1] L. Zhou et al., “High-efficiency True Bridgeless Totem Pole PFC based on GaN HEMT: Design Challenges and Cost-effective Solution,” in Proceedings of PCIM Europe 2015, Nuremberg, Germany, 2015.
[2] "1-kW High Efficiency Digital Power Factor Converter (PFC) for Telecom/Server Power & Motor Drives." TIDA kW High Efficiency Digital Power Factor Converter (PFC) for Telecom/Server Power & Motor Drives | TI.com. Accessed July 18,
This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award Number EEC
Other US government and industrial sponsors of CURENT research are also gratefully acknowledged.