US Patent No. 10,973,096

LED LIGHTING SYSTEMS AND METHODS FOR CONSTANT CURRENT CONTROL IN VARIOUS OPERATION MODES


Patent No. 10,973,096
Issue Date April 06, 2021
Title Led Lighting Systems And Methods For Constant Current Control In Various Operation Modes
Inventorship Lieyi Fang, Shanghai (CN)
Jun Zhou, Shanghai (CN)
Assignee On-Bright Electronics (Shanghai) Co., Ltd., Shanghai (CN)

Claim of US Patent No. 10,973,096

1. A system for providing at least an output current to one or more light emitting diodes, the system comprising:a transconductance amplifier configured to receive a sensed signal and generate a current signal;
a capacitor coupled to the transconductance amplifier and configured to generate a voltage signal;
a comparator configured to process information associated with the voltage signal and the sensed signal and generate a comparison signal based on at least information associated with the voltage signal and the sensed signal;
a modulation-signal generator configured to receive at least the comparison signal and generate a modulation signal; and
a gate driver configured to receive the modulation signal and output a drive signal to a switch;
wherein:
the drive signal is associated with at least one or more switching periods, each of the one or more switching periods including at least an on-time period for the switch;
the transconductance amplifier is further configured to, for each of the one or more switching periods, receive at least a predetermined voltage signal only during the on-time period; and
the current signal is configured to charge or discharge the capacitor.