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A Study on Influence of Synchronous Rectification Switch on Efficiency in Totem Pole Bridgeless PFC  

Yoo, Jeong Sang (Department of Electronics Engineering, Cheongju University)
Ahn, Tae Young (Department of Electronics Engineering, Cheongju University)
Publication Information
Journal of the Semiconductor & Display Technology / v.20, no.4, 2021 , pp. 108-113 More about this Journal
Abstract
In this paper, a totem pole PFC was structured in two methods with FET and diode for low-speed switch while GaN FET was used for high-speed switch. Internal power loss, power conversion efficiency and steady-state characteristics of the two methods were compared in the totem pole bridgeless PFC circuit which is widely applied in large-capacity and high-efficiency switching rectifier of 500W or more. In order to compare and confirm the steady-state characteristics under equal conditions, a 2kW class totem pole bridgeless PFC was constructed and the experimental results were analyzed. From the experimental results, it was confirmed that the low-speed switch operation has a large difference in efficiency due to the internal conduction loss of the low-speed switch at a low input voltage. Especially, input power factor and load characteristic showed no difference regardless of the low-speed switch operation.
Keywords
Totem pole bridgeless PFC; Efficiency analysis; Low speed SR switch; GaN FET; Bridgeless rectifier;
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