POWER SUPPLY FOR LED LIGHTING

The present utility model relates to an LED illumination power supply, comprising a diode bridge, a LED driving circuit, a driving current controlling unit, an input voltage detecting unit, and a valley filling circuit. The diode bridge rectifies AC power. The LED driving circuit drives LEDs with constant current. The driving current controlling unit is electrically connected to the LED driving circuit, and controls LED driving current. The input voltage detecting unit detects an input voltage after the diode bridge rectifies the AC power. A threshold value of the input voltage detecting unit is set to be a minimum required voltage value or more of LED. The valley filling circuit is electrically connected to the LED driving circuit and the input voltage detecting unit respectively, and has a capacitance. When the input voltage detected by the input voltage detecting unit is the threshold value or more, the LEDs are directly supplied with electrical power; when the input voltage detected by the input voltage detecting unit is lower than the threshold value, the LEDs are supplied with electrical power by the capacitance that has been charged.