US Patent No. 11,071,181

ADAPTIVE DIMMING CIRCUIT AND A METHOD THEREOF


Patent No. 11,071,181
Issue Date July 20, 2021
Title Adaptive Dimming Circuit And A Method Thereof
Inventorship Bo Yu, Hangzhou (CN)
Assignee Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)

Claim of US Patent No. 11,071,181


1. A dimming module comprising:a plurality of calculating circuits, wherein each calculating circuit is configured to receive a preset current duty cycle reference signal, a preset current magnitude reference signal and a feedback voltage of an associated light-emitting device string of a plurality of light-emitting device strings, and wherein based on the preset current duty cycle reference signal, the preset current magnitude reference signal and the feedback voltage of the associated light-emitting device string, the calculating circuit provides a current duty cycle reference signal and a current magnitude reference signal for controlling the associated light-emitting device string; and
a plurality of current regulating circuits, wherein each current regulating circuit is configured to receive the feedback voltage of the associated light-emitting device string, the current duty cycle reference signal and the current magnitude reference signal for the associated light-emitting device string, and wherein based on the current duty cycle reference signal, the current regulating circuit controls a duty cycle of a current flowing through the associated light-emitting device string, and wherein based on the feedback voltage and the current magnitude reference signal, the current regulating circuit controls a magnitude of the current flowing through the associated light-emitting device string; wherein
the current magnitude reference signal provided to the light-emitting device string with a minimum feedback voltage is lower than the preset current magnitude reference signal, while the current magnitude reference signal provided to each other light-emitting device string is higher than the preset current magnitude reference signal.