Half bridge resonant converters, circuits using them, and corresponding control methods
AssigneeSignify Holding B.V.
InventorsJohannes Hubertus Gerardus Op Het Veld, David Llewellyn John, Reinhold Elferich, William Peter Mechtildis Marie Jans
Life of this patent
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Abstract
A half bridge resonant converter comprises a half bridge inverter having a high side switch and a low side switch with an output defined from a node between the high side switch and the low side switch. The output connects to a resonant circuit. There are separate control circuits for generating the gate drive signals for controlling the switching of the high side switch and low side switch, in dependence on an electrical feedback parameter, each with different reference voltage supplies.
Claims15
A half bridge resonant converter, comprising:
- a pair of DC voltage lines arranged to provide a bus voltage, wherein the pair of DC voltage lines comprises a high voltage line and a low voltage line;
- a half bridge inverter in series between the high voltage line and the low voltage line, wherein the half bridge inverter comprises a high side switch and a low side switch, wherein an output of the half bridge inverter is defined from a switch node between the high side switch and the low side switch;
- a resonant circuit coupled to the output of the half bridge inverter;
- a first control circuit for generating a first gate drive signal for controlling switching of the high side switch, wherein the first control circuit is arranged to control a duty cycle of the high side switch by increasing an on-time of the high side switch if an average switch node voltage is lower than a fraction of the bus voltage and by decreasing the on-time of the high side switch if the average switch node voltage is higher than the fraction of the bus voltage;
- and
- a second control circuit for generating a second gate drive signal for controlling switching of the low side switch in dependence on an electrical feedback parameter.
A conversion method, comprising:
- operating a half bridge inverter comprising a high side switch and a low side switch between a DC high voltage line and a DC low voltage line providing a bus voltage, using a gate drive signal and providing an output from a switch node between the high side switch and the low side switch;
- providing the output of the half bridge inverter to a resonant circuit;
- generating a first gate drive signal using a first control circuit, for controlling a duty-cycle of the high side switch by increasing an on-time of the high side switch if an average switch node voltage is lower than a fraction of the bus voltage and by decreasing the on-time of the high side switch if the average switch node voltage is higher than the fraction of the bus voltage;
- and
- generating a second gate drive signal using a second control circuit, for controlling switching of the low side switch in dependence on an electrical feedback parameter.
Dependencies are inferred from the claim text.