Patent ID: 9107254
Filing Date: 2015-08-11
Classification: H05B,Y02B,Y10T

Abstract:
1. A LED lighting device comprising: an LED array composed of a plurality of LED light module groups, each LED light module group comprising a plurality of LEDs connected in series; and at least one constant current diode configured to keep a current received from a power supply constant and to drive the LEDs in the plurality of LED light module groups to emit light via the constant current, wherein the constant current diode has negative power characteristic, thereby, when an operating temperature of an integrated chip on which the LED lighting device is arranged is too high, the constant current diode will automatically reduce a circuit power input supplied to the plurality of LED light module groups to reduce the temperature of the integrated chip so as to protect it from lumens depreciation due to overheating, wherein the LED lighting device further comprises: a PWM impulse source connected to a control in end of the constant current diode via a diode, wherein the PWM impulse source outputs a controllable impulse, the controllable impulse are rectified by the diode and then are input into the controlling to enable the constant current diode to be switched on discontinuously at a controlled impulse frequency, such that the LED light module groups flash discontinuously at the controlled frequency, thereby, based on a feature that the human eye is not sensitive to high-frequency of flicker, in the case of power supply is halved, a lighting effect of the LED light module groups is near normal lighting effect.