Patent ID: 9420655
Filing Date: 2016-08-16
CPC Classification: H05B,Y02B

Claim Text:
1. A method of driving LED chips of same power but different rated voltages and currents, comprising the steps of: A. setting a predetermined power; B. connecting a LED chip which has a rated power accordant to the predetermined power; C. obtaining a working current of the LED chip while the LED chip is operated at the predetermined power; and D. providing a driving current to the LED chip, and maintaining the driving current the same as the working current; wherein the working current of the LED chip is obtained by providing the LED chip with the driving current, which is gradually increased from an initial current lower than the working current, and measuring the LED chip to obtain a driving voltage thereof and, therefore, a product of the driving voltage and the driving current; once the product reaches the predetermined power, the driving current is maintained and stopped being increased, and the maintained driving current equals the working current of the LED chip.