A CONTROL SYSTEM FOR MINIMIZE BRIGHTNESS OF DEVIATION IN CASE AC DRIVING LED

摘要

PURPOSE: A brightness variation minimization control system between alternating current-driven light emitting diodes (LEDs) is provided to implement uniform brightness. CONSTITUTION: A full-wave rectification unit applies alternating current (AC) voltage. A slave source control unit (400) is connected to a region between plurality of LEDs and LED group. A section instantaneous current control unit non-instantaneously section constant-current controls the LED groups. An input power compensation unit (900) controls current height and current angle of a lower group. An overvoltage prevention unit (500) protects the LED and active device when inputting transient voltage.