High Efficiency High Order CL-LLC DC/DC Converter With Wide Input Voltage Range

A novel multi-resonant DC-DC converter is presented in this paperwhich owns a wide input voltage range and better voltage gain characteristics. Due to the addition of an anti-resonant tank with notch filter function, the converter introduces third harmonics in the power transmission, which can reduce the circulating energy in the resonant tank and reduce the loss of rectifier diode, thus improving the efficiency. The CL-LLC converter can realize soft switching in full load range. This paper introduces the operating principle of the converter and the method of the parameters design. Finally, a 350V-500V input and 24V/400W prototype is designed to verify the correctness of the theory.