公开(公告)号：US11917737B2

公开(公告)日：2024-02-27

申请号：US17877630

申请日：2022-07-29

Applicant: Bio-Rad Laboratories, Inc.

Inventor： Edward George Marquette

IPC: H05B45/46

CPC classification number: H05B45/46

Abstract: A circuit for sharing current between parallel LEDs or parallel strings of LEDs, and a method of use of the same, are disclosed herein. The circuit for sharing current between parallel LED pathways can include a first LED pathway, a first transistor coupled to the first set of LEDs and that can control a first current through the first set of LEDs, and a first measurement node having a first sensed voltage. The circuit can include a second LED pathway, a second transistor coupled to the second set of LEDs and that can control a second current through the second set of LEDs, and a second measurement node having a second sensed voltage. The circuit includes a first differential amplifier and a second differential amplifier, each of which can compare sensed voltage and can apply a voltage to a gate of one of the first and second transistors.