US 10,389,260 B2
Half bridge resonant converters, circuits using them, and corresponding control methods
Johannes Hubertus Gerardus Op Het Veld, Roermond (NL); Dave Llewellyn John, Willingham (GB); Reinhold Elferich, Aachen (DE); and William Peter Mechtidis Marie Jans, Born (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 16/87,014
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Apr. 11, 2017, PCT No. PCT/EP2017/058658
§ 371(c)(1), (2) Date Sep. 20, 2018,
PCT Pub. No. WO2017/178477, PCT Pub. Date Oct. 19, 2017.
Claims priority of application No. 16165365 (EP), filed on Apr. 14, 2016.
Prior Publication US 2019/0097542 A1, Mar. 28, 2019
Int. Cl. H02M 3/335 (2006.01); H02M 1/08 (2006.01); H05B 33/08 (2006.01); H02M 3/337 (2006.01); H02M 7/5383 (2007.01); H02M 3/07 (2006.01); H02M 7/537 (2006.01); H02M 7/48 (2007.01)
CPC H02M 3/33569 (2013.01) [H02M 1/08 (2013.01); H02M 3/07 (2013.01); H02M 3/335 (2013.01); H02M 3/3378 (2013.01); H02M 7/537 (2013.01); H02M 7/53832 (2013.01); H05B 33/0809 (2013.01); H05B 33/0815 (2013.01); H02M 2007/4815 (2013.01); Y02B 20/348 (2013.01); Y02B 70/1433 (2013.01); Y02B 70/1441 (2013.01)] 13 Claims
OG exemplary drawing
 
1. 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 output capacitor;
a first generating circuit for generating a first supply voltage from the high voltage line and from a 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 a 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; 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.