Design of two-switch flyback converter with CLC output filter

An auxiliary power supply converter, which offered energy for high power inverter arc welding power supply´s control system, was developed technically. Its main circuit adopted two-switch flyback converter with CLC output filter. According to its working states in continuous conduction mode, a stable and dynamic low-frequency small-signal model circuit of two-switch flyback converter was set up by means of state space average method. Some transfer functions were concluded accordingly. The Bode plot diagram and simulation waves, which were derived from the open-loop transfer function, were analyzed. One proper compensation network was designed and the simulation results of the system were given. In the changing range of input voltage, a series of experiments with light load and full load were processed and some usable results were derived. The method of design, the correctness of the small-signal model and the performance of the converter were verified by the simulation and experiment results.