US 11,864,292 B2
Isolated converter with improved current sensing
Harald Netzer, Nenzing (AT); and Stefan Stark, Muntlix (AT)
Assigned to Tridonic GmbH & Co KG, Dornbirn (AT)
Appl. No. 17/996,513
Filed by Tridonic GmbH & Co KG, Dornbirn (AT)
PCT Filed Apr. 7, 2021, PCT No. PCT/EP2021/059059
§ 371(c)(1), (2) Date Oct. 19, 2022,
PCT Pub. No. WO2021/213803, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 20170991 (EP), filed on Apr. 23, 2020.
Prior Publication US 2023/0254958 A1, Aug. 10, 2023
Int. Cl. H05B 45/382 (2020.01); H05B 45/14 (2020.01)
CPC H05B 45/382 (2020.01) [H05B 45/14 (2020.01)] 16 Claims
OG exemplary drawing
 
1. An isolated converter (100) for providing a current supply to an LED load, comprising:
a galvanic isolation stage (101);
a sensing circuit (103) on a primary side of the isolation stage (101), which is magnetically coupled to a secondary side of the isolation stage (101);
wherein the sensing circuit (103) is configured to receive a feedback signal that is proportional to a secondary side current; and
a control unit (105) configured to determine an output current of the converter (100) based on the feedback signal;
wherein at least one electrical characteristic of the sensing circuit (103) and/or the control unit (105) is adjustable to convert the feedback signal from a first ratio to a second ratio to the secondary side current, the converter (100) is designed to provide the output current in at least one dimming range, and the feedback signal is set to a fixed ratio to the secondary side current for all dimming ranges of the converter (100), wherein the fixed ratio depends on a maximum current level to be detected.