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A New Hybrid Switching Frequency Control for Resonant Converter with Fast Dynamic Response

A new hybrid switching frequency technique is proposed in this paper to improve the efficiency while providing fast dynamic response. Under steady state condition, the switching frequency of resonant converter is controlled to track the resonant frequency of converter to either reduce the turn-off losses or circulating losses of converter, and thereby improving the efficiency. The output voltage regulation (or voltage gain) of resonant converter is achieved mainly by tuning the DC-bus voltage of power factor corrector. Under transient condition, the DC-bus voltage is fixed and the switching frequency is determined by the load condition to improve the transient response speed. A digital-controlled converter with power factor correction and full bridge resonant converter are build up for test and confirmation. The designed and implemented 540 W / 12 V server power is with AC input voltage of 115/230 V. Test results confirm the proposed hybrid switching frequency control provides frequency tracking under steady state and fast dynamic response under transient condition.