Resonant converter

A method of operating a resonant converter for supplying electrical energy from a supply source to a load, the resonant converter comprising:

• first and second series-arranged controllable switches for connection across the supply source;
• a resonant tank circuit in electrical connection with the first and second switches;
• a control circuit;
• and
• a voltage compensation circuit,
• the method comprising:
• generating control signals by the control circuit to open and close the first and second switches at a switching frequency and according to a relative output power signal received by the controller, such that non-overlapping conduction intervals are defined by opening and closing of the first and second switches, the control circuit configured to derive first and second voltage levels from the received relative output power signal;
• and
• generating a periodic compensation voltage signal at the switching frequency by the voltage compensation circuit, the compensation voltage signal having an amplitude dependent on a difference between a reference voltage and an output voltage of the converter when the output voltage is below the reference voltage,
• wherein the control circuit monitors a node on the resonant tank and turns off the first switch to end the first conduction interval when a monitored voltage derived from the node is less than a sum of the first voltage level and the compensation voltage signal and turns off the second switch to end the second conduction interval when the monitored voltage is greater than a sum of the second voltage level and the compensation voltage signal.