Patent ID: 9454172
Filing Date: 2016-09-27
CPC Classification: G05F,H05B,Y02B

Claim Text:
1. A voltage control circuit comprising: a voltage dividing unit dividing a supply voltage into a first voltage and a second voltage different from each other; a shunt regulator adjusting the first voltage according to the second voltage; an output circuit unit outputting a voltage regulated by the shunt regulator at an output terminal; and a voltage adjusting unit adjusting the outputted voltage from the output terminal according to a dimming voltage to provide a reference voltage, wherein the voltage adjusting unit includes three or more output resistors connected in series between a supply voltage terminal and a ground; and a Zener diode connected between a ground and one of the connection nodes between the output resistors; wherein the voltage adjusting unit receives the dimming voltage in a connection node between the output resistors and provides the reference voltage to another connection node between the output resistors.