US 11,723,128 B2
Systems and methods for controlling currents flowing through light emitting diodes
Ke Li, Shanghai (CN); and Liqiang Zhu, Shanghai (CN)
Assigned to On-Bright Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD., Shanghai (CN)
Filed on Dec. 17, 2021, as Appl. No. 17/554,306.
Application 17/554,306 is a continuation of application No. 17/127,711, filed on Dec. 18, 2020, granted, now 11,252,799.
Claims priority of application No. 201911371960.8 (CN), filed on Dec. 27, 2019.
Prior Publication US 2022/0225480 A1, Jul. 14, 2022
Int. Cl. H05B 45/31 (2020.01); H05B 45/10 (2020.01)
CPC H05B 45/31 (2020.01) [H05B 45/10 (2020.01)] 30 Claims
OG exemplary drawing
 
1. A system for controlling one or more light emitting diodes, the system comprising:
a phase detector configured to process information associated with a rectified voltage generated by a rectifier and related to a TRIAC dimmer, the rectified voltage corresponding to a first waveform during a first half cycle of an AC voltage and corresponding to a second waveform during a second half cycle of the AC voltage, the phase detector being further configured to generate a phase detection signal representing a first time duration during which the first waveform indicates that the rectified voltage is larger than a predetermined threshold and representing a second time duration during which the second waveform indicates that the rectified voltage is larger than the predetermined threshold;
a modified signal generator configured to receive the phase detection signal from the phase detector and a mode detection signal associated with a mode of the TRIAC dimmer, modify the phase detection signal based at least in part on the mode detection signal, and generate a modified signal representing a third time duration corresponding to the first half cycle of the AC voltage and a fourth time duration corresponding to the second half cycle of the AC voltage; and
a current controller configured to receive the modified signal, the current controller being further configured to control, based at least in part of the modified signal, a first current flowing through one or more light emitting diodes configured to receive the rectified voltage;
wherein:
the first time duration and the second time duration are different in magnitude; and
the third time duration and the fourth time duration are the same in magnitude.