Enhanced hybrid hysteretic control of llc converters

A microcontroller comprising:

• a power control unit configured to control a switching frequency of a power converter circuit based on thresholds of a resonant capacitor of the power converter circuit;
• and
• a processing unit coupled with the power control unit configured to at least:
• receive an event signal from the power control unit indicative of a breach of one of the thresholds by the resonant capacitor;
• determine that the switching frequency is outside a defined range based on the event signal;
• and
• in response to determining that the switching frequency is outside the defined range, supply a control signal instructing the power control unit to clamp the switching frequency of the power converter.

A method of operating a microcontroller to control an output voltage produced by a power converter circuit, wherein the microcontroller comprises a power control unit and a processing unit, and wherein the method comprises:

• in the power control unit:
• adjusting a switching frequency of the power converter circuit based on thresholds of a resonant capacitor of the power converter circuit;
• and
• generating event signals indicative of breaches of the thresholds by the resonant capacitor;
• and
• in the processing unit:
• receiving an event signal from the power control unit indicative of a breach of one of the thresholds by the resonant capacitor;
• determining that the switching frequency falls outside a defined range based on the event signal;
• and
• in response to determining that the switching frequency falls outside the defined range, instructing the power control unit to clamp the switching frequency of the power converter circuit.