Closed-loop control of AC/DC three-phase Current Injection Series Resonant Converter

A direct-frequency control for Current Injection Series Resonant Converter (CISRC) is developed to regulate the output voltage. The PI controller is used and the design is based on the open-loop control-to-output frequency responses. Controller design also involves a trade-off between reducing the output voltage ripple and maintaining the high quality input line current. The closed-loop direct frequency control of the CISRC is finally validated with a combination of results from the prediction in MATLAB^reg and the detailed simulation in Saber^reg. As a result, for the first time, a complete closed-loop operation of the CISRC is presented.