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Asymmetric PWM Control Scheme During Hold-Up Time for LLC Resonant Converter

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3 Author(s)
Bong-Chul Kim ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea ; Ki-Bum Park ; Gun-Woo Moon

To narrow down the switching-frequency-variation range of an LLC resonant converter, asymmetric pulsewidth modulation (APWM) of the hold-up time is proposed. During the hold-up time, the modulation method of an LLC resonant converter is changed from frequency modulation (FM) to APWM. Since the LLC resonant converter achieves a higher gain with APWM than it does with FM at the same switching frequency, the switching-frequency-variation range is reduced. Therefore, an optimal design of the magnetic components is possible, resulting in a high efficiency under normal operation and a high power density. The proposed control scheme is applied to an 85-W LLC resonant converter.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 7 )