| 摘要 |
The present invention relates to a circuit for ameliorating a flicker of an AC direct driving LED. The circuit comprises: a power supply unit to supply AC input power by rectifying the AC input power; a plurality of LEDs which are turned on by the power supplied from the power supply unit; a plurality of LED driving switches which are turned on by a switching control signal inputted from a control unit by connecting to a rear end of the LEDs and to switch a current of an LED which approaches an LED driving threshold voltage; a control unit to detect whether an input voltage inputted into the LED approaches the LED driving threshold voltage when the input voltage is increased, and to control the driving of the LED driving switches by outputting a switching control signal for driving the LED driving switches connected to the LEDs respectively when the input voltage of each LED approaches the driving threshold voltage; and a flicker ameliorating condenser to remove flickering generated as the LED is turned on and off according to a cycle of the input voltage, by being connected to the LEDs in parallel. According to the present invention, the circuit can minimize a flicker phenomenon generated by turning the LEDs on and off. |
