Optimal Design of CLLC Resonant Converter Parameters to Reduce Turn-off Loss
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Abstract
The commonly used methods for parameter design of Capacitor-Inductor-Inductor-Capacitor (CLLC) converters include the harmonic approximation method and the time-domain analysis method. The harmonic approximation method only retains the first harmonic component, resulting in inaccurate gain over a wide frequency range. While the time-domain analysis method is applicable to a wide frequency range but has high computational complexity, moreover, neither considers the relationship between output gain and turn-off loss. However, existing design methods for turn-off loss in LLC resonant converters can’t be directly applied to CLLC resonant converters due to the differences in their topology. To address the aforementioned issues, this paper proposes a novel approach to optimize the design parameters of CLLC resonant converters and reduce turn-off loss. Firstly, the gain on the excitation inductance is obtained based on the output gain of the CLLC resonant converter, and then the expressions for the excitation current Im and the turn-off loss Poff with respect to (k, Q, fn) are obtained. Finally, a 5000W experimental prototype was built and its peak efficiency was verified to reach 95.48%.
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