Patent ID: 11956867
Assignee: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
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 a predetermined voltage signal and generate a current signal;
a comparator configured to process information associated with a voltage signal and a ramping signal and generate a comparison signal based on at least information associated with the voltage signal and the ramping signal, the voltage signal generated by a capacitor;
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 switch period 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 switch period of the one or more switching periods, receive the predetermined voltage signal only during the on-time period for the switch; and
the current signal is configured to charge or discharge the capacitor.