Resonant converter with dual-mode control

A method for controlling switching of a switching network of a resonant converter, the method including:

• generating a charge-control signal corresponding to a charge of a resonant network of the resonant converter;
• generating a load-control signal based on a voltage reference and an output from a rectifier network of the resonant converter;
• providing the charge-control signal and the load-control signal as feedback to a switching controller of the resonant converter;
• and
• providing switching signals from the switching controller to a first totem pole circuit and a second totem pole circuit of the resonant converter based on a control mode of the resonant converter, wherein the control mode includes:
• assessing a charge-control signal criterion that is satisfied when the charge-control signal is greater than or equal to the load-control signal;
• changing states of the switching signals for the first totem pole circuit when the charge-control signal criterion is satisfied;
• assessing a first clock-timer signal criterion that is satisfied when a first clock-timer signal is greater than or equal to a minimum switching period signal;
• and
• maintaining states of the switching signals for the second totem pole circuit until both the charge-control signal criterion and the first clock-timer signal criterion are satisfied, thereby clamping a switching frequency of the switching signals at a target frequency defined by the minimum switching period signal.

A non-transitory computer-readable medium storing instructions which, when executed by a processor, cause the processor to perform a method for controlling switching of a full bridge switching network of a resonant converter, the method including:

• assessing a charge-control signal criterion that is satisfied when a charge-control signal is greater than or equal to a load-control signal;
• changing states of first totem pole switching signals for the full bridge switching network when the charge-control signal criterion is satisfied;
• assessing a first clock-timer signal criterion, wherein the first clock-timer signal criterion is satisfied when a first clock-timer signal is greater than or equal to a minimum switching period signal;
• and
• maintaining states of second totem pole switching signals for the full bridge switching network until both the charge-control signal criterion and the first clock-timer signal criterion are satisfied, thereby clamping a switching frequency of the first totem pole switching signals and the second totem pole switching signals at a target frequency defined by the minimum switching period signal.