TY - JOUR
AU - Hou, Jing
AB - LLC resonant converters are prone to generating a large inrush current during the start-up process, which will cause damage to the resonant elements and threaten the safe operation of the circuit. In this study, we investigate the soft-start method to suppress the inrush current of an LLC resonant converter. Based on the traditional frequency-decreasing method, we integrate PWM control to broaden the output voltage gain range during the start-up. Additionally, to ensure the smooth establishment of the output voltage, the controller performs the closed-loop control of the duty cycle and frequency in sequence based on the rate of output voltage rise. A prototype experiment based on STM32F334C8T6 is established to experimentally validate the presented soft start-up method. The experiment results indicate that the soft start-up method improves the start-up performance, reduces the maximum inrush current by 47.5% compared with that of the frequency-decreasing method, and builds up the output voltage quickly. The start-up process is smooth, which improves the reliability of the LLC resonant converter.
TI - Hybrid Control-Based Closed-Loop Soft Start-Up Method for LLC Resonant Converters
JF - Electronics
DO - 10.3390/electronics12224563
DA - 2023-11-07
UR - https://www.deepdyve.com/lp/multidisciplinary-digital-publishing-institute/hybrid-control-based-closed-loop-soft-start-up-method-for-llc-resonant-b1KphaZO2k
SP - 4563
VL - 12
IS - 22
DP - DeepDyve
ER -