TY - GEN
T1 - A Switching Frequency Variation Detecting based Adaptive and Sensorless Synchronous Rectification Strategy for LLC Converter
AU - Li, Ziang
AU - Wei, Yuqi
AU - Liu, Jinjun
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - To reduce the greenhouse gas emissions, the improvement of power electronic converters' efficiency is of great importance. LLC converter, as one of the most popular isolated and efficient DC-DC converter topologies, has been widely utilized in various industrial applications. The synchronous rectification (SR) technology is adopted to further improve the conversion efficiency due to the much lower ON-state resistance of SR MOSFETs when compared with diodes. Various SR driving strategies have been proposed for LLC converters and they can be divided into sensorless strategies and sensor-based strategies. Compared with sensor-based strategies, the sensorless strategies are low-cost and low-loss but model-dependent and less adaptive. To address these issues, this paper proposed a sensorless and adaptive SR strategy based on the switching frequency variation detecting. It adjusts the delay times of SR driving signals in fixed steps and detects the variation of their steady-state switching frequency. Based on the fact that the switching frequency variation is greatly different when the delay time is above or below the ideal delay time, the proposed algorithm can get the accurate SR signals in all LLC operation modes. The effectiveness and accuracy of the proposed SR strategy are verified by various simulations.
AB - To reduce the greenhouse gas emissions, the improvement of power electronic converters' efficiency is of great importance. LLC converter, as one of the most popular isolated and efficient DC-DC converter topologies, has been widely utilized in various industrial applications. The synchronous rectification (SR) technology is adopted to further improve the conversion efficiency due to the much lower ON-state resistance of SR MOSFETs when compared with diodes. Various SR driving strategies have been proposed for LLC converters and they can be divided into sensorless strategies and sensor-based strategies. Compared with sensor-based strategies, the sensorless strategies are low-cost and low-loss but model-dependent and less adaptive. To address these issues, this paper proposed a sensorless and adaptive SR strategy based on the switching frequency variation detecting. It adjusts the delay times of SR driving signals in fixed steps and detects the variation of their steady-state switching frequency. Based on the fact that the switching frequency variation is greatly different when the delay time is above or below the ideal delay time, the proposed algorithm can get the accurate SR signals in all LLC operation modes. The effectiveness and accuracy of the proposed SR strategy are verified by various simulations.
KW - LLC resonant converter
KW - adaptive
KW - sensorless
KW - synchronous rectification
UR - https://www.scopus.com/pages/publications/85170393947
U2 - 10.1109/PEDG56097.2023.10215180
DO - 10.1109/PEDG56097.2023.10215180
M3 - 会议稿件
AN - SCOPUS:85170393947
T3 - PEDG 2023 - 2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems
SP - 247
EP - 252
BT - PEDG 2023 - 2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023
Y2 - 9 June 2023 through 12 June 2023
ER -
