| 摘要 |
<p>The present invention relates to a control system for minimizing brightness differences between AC-driven LEDs, and comprises: a full-wave rectification unit for rectifying a power source; an LED unit in which a plurality of LEDs are arrayed; a slave source control unit for control; a sectional instantaneous current control part for non-sequentially section-controlling a plurality of LED groups; an overvoltage prevention unit for protecting LEDs and active devices; an input power compensation unit for actively controlling the current level and current angle of a lower group; and an upper group secondary instantaneous current compensation unit for minimizing the loss of the lower group LED for the main TR. The current difference between one LED group and the end LED group can be reduced to provide lamps having the most uniform light flux and brightness throughout all sections, and the optimum IF can be set so as to maximize the LED light flux efficiency, and a dual control system for an upper group controller both reduces the cost and maximizes the control efficiency.</p> |
