Back to results
US 2019/0097542 A1Published application
Half bridge resonant converters, circuits using them, and corresponding control methods
AssigneePhilips Lighting Holding B.V.
InventorsJOHANNES HUBERTUS GERARDUS OP HET VELD, DAVE LLEWELLYN JOHN, REINHOLD ELFERICH, WILLIAM PETER MECHTIDIS MARIE JANS
Life of this patent
Estimating the term…
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.
Claims13
A half bridge resonant converter, comprising:
- a pair of DC voltage lines comprising a high voltage line and a low voltage line;
- a half bridge inverter comprising a high side switch and a low side switch in series between the high voltage line and the low voltage line, wherein an output of the half bridge inverter is defined from a node (X) between the high side switch and the low side switch;
- a resonant circuit coupled to the output of the half bridge inverter via a series capacitor;
- a first generating circuit for generating a first supply voltage from the high voltage line and from the voltage at the node (X) wherein the first generating circuit comprises:
- a first input for receiving a voltage between the node (X) and the resonant circuit;
- a charge pump circuit for converting an AC voltage at the first input into a DC voltage and storing it on a first output capacitor (Co) as an output of the first generating circuit at the first supply voltage;
- and
- a supply transistor between the high voltage line and the output of the first generating circuit for charging the output capacitor (Co) before the start-of-oscillation occurs;
- a second generating circuit for generating a second supply voltage from the low voltage line and from the voltage at the node (X);
- a first control circuit for generating a gate drive signal for controlling the switching of the high side switch in dependence on an electrical feedback parameter, wherein the first control circuit has as its reference voltage supply the voltage at the node (X) and the first supply voltage greater than the voltage at the node (X);
- and
- a second control circuit for generating a gate drive signal for controlling the switching of the low side switch in dependence on the electrical feedback parameter, wherein the second control circuit has as its reference voltage supply the low voltage line and the second supply voltage greater than the voltage at the low voltage line.
9 more elements
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, using a gate drive signal and providing an output from a node between the high side switch and the low side switch;
- providing the output of the half bridge inverter to a resonant circuit via a series output capacitor;
- generating a gate drive signal using a first control circuit, for controlling the switching of the high side switch in dependence on an electrical feedback parameter, wherein the first control circuit has as its reference voltage supply the voltage at the node between the high side switch and the low side switch and a first supply voltage greater than the voltage at the node between the high side switch and the low side switch;
- generating a first supply voltage from the DC high voltage line and from the voltage at the node comprising the following method steps:
- receiving a voltage between the node and the resonant circuit;
- converting an AC voltage between the node and the resonant circuit at a first input into a DC voltage and storing it on a first output capacitor as an output via a charge pump;
- charging the output capacitor before the start-of-oscillation occurs via a supply transistor;
- and
- generating a gate drive signal using a second control circuit, for controlling the switching of the low side switch in dependence on the electrical feedback parameter, wherein the second control circuit has as its reference voltage supply the low voltage line and a second supply voltage greater than the voltage at the low voltage line.
6 more elements
Dependencies are inferred from the claim text.