Patent ID: 8836242

Claim:
An LED voltage adjustment device, characterized in that wherein the LED voltage adjustment device comprises: a PI regulator, with negative terminal connected to the negative terminal of the LED light bar to receive negative terminal voltage of the light bar and positive terminal of the PI regulator for receiving reference voltage; an integrator for receiving an output signal of PI regulator; a subtractor, with positive input terminal receiving output signal from PI regulator and negative terminal receiving overcurrent protection detection voltage from the boost converter for driving the light bar, and for subtracting the overcurrent protection detection voltage from the output signal of the PI regulator; a comparator, with positive terminal receiving output signal from the integrator and negative terminal receiving output signal from the subtractor; and an integrated circuit (IC) module, for receiving output signal from the comparator and based on the received output signal to control a control signal to conduct or cut off a switch transistor of the boost converter.