| 摘要 |
An LED driving circuit having a time delay function of a current source according to the present invention includes: a power supply unit that includes a power input terminal to which external alternating current (AC) power is applied, a dimmer connected to the power input terminal and receiving an AC voltage, and a rectifying circuit for an output voltage from the dimmer; an LED lighting unit that includes a first LED, which is located at the shortest distance from the connection point to the power supply unit, to an nth LED, which is located at the longest distance from the power supply unit, and in which the first LED is connected to the power supply unit and each LED is serially connected; a plurality of switching circuits that are individually connected to the output terminal of each LED forming the LED lighting unit and that form a current supply channel for a corresponding LED; a reference voltage generating unit that forms a reference voltage value for each of the switching circuits; and a time delay circuit unit that is connected in parallel to the connection line between the power input terminals of the power supply unit and the first LED and gradually increases a source voltage for the switching circuit of the power supply unit based on the voltage value of the reference voltage generating unit. |
