US 12,445,033 B2
Driver for delivering current to a LED load
Bing Guo, Shanghai (CN); Honghao Zhong, Shanghai (CN); Muhui Huang, Shanwei (CN); and Yefen Yu, Shanghai (CN)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 18/580,680
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Jul. 15, 2022, PCT No. PCT/EP2022/069921
§ 371(c)(1), (2) Date Jan. 19, 2024,
PCT Pub. No. WO2023/001714, PCT Pub. Date Jan. 26, 2023.
Claims priority of application No. PCT/CN2021/108263 (WO), filed on Jul. 23, 2021; and application No. 21195877 (EP), filed on Sep. 10, 2021.
Prior Publication US 2024/0372456 A1, Nov. 7, 2024
Int. Cl. H02M 1/00 (2007.01); H04N 9/31 (2006.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01); H05B 45/3725 (2020.01)
CPC H02M 1/0025 (2021.05) [H04N 9/3155 (2013.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01); H05B 45/3725 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A driver, comprising:
an input to receive input power,
a converter to convert the input power to an output current;
a current control loop for controlling the converter and regulating the output current, the current control loop having an error amplifier and a first compensation circuit provided to an output of the error amplifier, said first compensation circuit comprises a first capacitor;
an output to output said output current to a load;
an adjusting circuit to selectively deliver, or not deliver, the output current to the load and effectively adjust the load as seen by the driver between a first level and a second level, and
a controller for controlling the adjusting circuit and the current control loop, wherein the controller is adapted to:
save the voltage of the first capacitor of the current control loop by disconnecting the first capacitor from the output of the error amplifier, before the adjusting circuit changes the load as seen by the driver from the first level to the second level; and
re-connect the first capacitor with the saved voltage to the output of the error amplifier of the current control loop, when the adjusting circuit changes the load as seen by the driver back from the second level to the first level.