Abstract：In the applications of wide output voltage range, the LCC resonant converter with frequency modulation has the disadvantage of wide switching frequency range, while the fixed frequency modulation has the disadvantage of narrow soft-switching range. In this paper, a T-type half-bridge LCC resonant converter with linear-resonance (L-R) composite modulation is proposed. The energy storage stage is added to the traditional resonant mode, which makes the resonant current show linear and resonant changes in one cycle. It can improve the voltage gain, and has the characteristics of soft switching and no circulating current in the full load range. The proposed converter operates in resonant-linear feedback (R-LF) and linear boost-resonant (LB-R) modes by adopting PFM-PWM composite modulation, and can achieve wide voltage gain range with narrow switching frequency. The switching frequency is fixed in the light load condition, which improves light load efficiency. In this paper, the operating principle was introduced in detail, and the expression of voltage gain was derived. The design steps based on constant current and constant voltage charging were given. Finally, an experimental prototype was built, and the results proved the correctness of the theoretical analysis.
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2022, Vol. 37 
