Output and Control Characteristics of an LLC DC-DC Converter Operating above Resonant Frequency based on State Plane Analysis

The paper presents an LLC resonant DC-DC converter output and control characteristics for frequency control obtained using state plane analysis. It also expands on the quantities on which the choice of the main circuit elements, used in the design procedures of the LLC converter, depends. Finally, a comparison of the results obtained through state plane analysis and those obtained using the first harmonic approximation method is made.