LLC and LCC Analysis and Comparison of Resonant Converters

In this paper, we adopt variable frequency control strategy for resonant converters with LLC and LCC resonant structures, which work in the zero voltage switch (ZVS) region. Based on the fundamental wave analysis (FWA) method, we obtain some theoretical research results. The saber simulations using current continuous mode are provided to verify the correctness of these theoretical research results. Compared with the results of LLC and LCC resonant structures, we find that LLC resonant structure is suitable for working in low-voltage and high-current pattern whereas LCC is suitable for highvoltage and low-current pattern. We present a summary of the advantages and disadvantages of the two resonance control structures. By changing the values of resonant inductance and distributed capacitance, we can adjust the resonant power supply with the corresponding resonant structures to work in the required area.