US 12,336,072 B2
LED driver and lighting system using the same
Christian Hattrup, Wurselen (DE)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/770,459
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Oct. 12, 2020, PCT No. PCT/EP2020/078604
§ 371(c)(1), (2) Date Apr. 20, 2022,
PCT Pub. No. WO2021/078562, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 19204633 (EP), filed on Oct. 22, 2019.
Prior Publication US 2022/0386433 A1, Dec. 1, 2022
Int. Cl. H05B 45/54 (2020.01); H05B 45/345 (2020.01); H05B 45/37 (2020.01); H05B 45/50 (2022.01)
CPC H05B 45/54 (2020.01) [H05B 45/345 (2020.01); H05B 45/37 (2020.01); H05B 45/50 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A LED driver, comprising:
a driver unit configured to deliver a current to a LED arrangement; and
a resistor arrangement configured to sense the current delivered and provide a feedback signal to the driver unit, wherein the resistor arrangement is arranged in series with the LED arrangement,
wherein the feedback signal comprises a voltage across the resistor arrangement, wherein the resistor arrangement comprises:
a first current sensing branch comprising at least two series resistors connected at a first sensing node; and
a second current sensing branch, in parallel with the first current sensing branch, comprising at least two series resistors connected at a second sensing node, wherein the first sensing node is a connection between the at least two series resistors of the first current sensing branch and the second sensing node is the connection between the at least two series resistors of the second current sensing branch,
wherein the LED driver further comprises a fault detection unit coupled to the first sensing node and the second sensing node and configured to receive the voltages at the first sensing node and the second sensing node to determine a difference of the voltages at the first and second sensing nodes to determine a component failure.