Patent ID: 9072149
Filing Date: 2015-06-30
Classification: H05B,Y02B

Abstract:
1. A light emitting diode (LED) driving device with open circuit protection and color temperature and brightness adjustment, consisting of a dimming module, a rectification module, a conversion module, a control module and an output module, and the control module including a control chip installed therein, electrically coupled to the conversion module and the LEDs, and further electrically coupled to the output module through a transistor and a sensing resistor, characterized in that the LEDs is divided into a plurality of strings, and at least one string is formed by coupling a plurality of blue light diodes in series, and the remaining strings are formed by coupling a plurality of yellow light LEDs in series, and a cathode terminal of at least one of the yellow light strings is coupled to a cathode terminal of the blue light string to form a node; and the output module includes a switch which is a three-way element with two output terminals coupled to the blue light string and the yellow light string respectively, and a power input pin of the control chip is electrically coupled to the node, such that when the LEDs are open circuited by an abnormality, the voltage level at the node is lower than the working voltage of the control chip, the control chip stops operating to produce the effect of protecting the whole circuit, and the switch is switched to conduct the blue light string or the yellow light string to change the color temperature of the emitted light of a lamp.