Control method for fluorescent transparent ceramic high power LED light source

Abstract

The invention provides a control method for a fluorescent transparent ceramic high power LED light source. The blue light LED chip array of a high power light source is divided into several areas. An equal amount of some red light LED chips are added into a blue light chip of each area. The blue light chips and red light chips in the areas are controlled by separate current sources, the current of the red light chips is maintained to be unchanged, the change value Delta Vf of the forward voltage drop of the red light chips in a selected time period is monitored in real time through an A / D module, a temperature change amount Delta T of the red light chips is obtained according to a formula Delta T = Delta Vf / k, if Delta T exceeds a limit threshold T1, an output mode of the current source of the blue light chips of the area is adjusted through a MCU single chip microcomputer, line current is changed into a preset pulse current mode from a DC current mode, and when the voltage drop of the red light chips is smaller than Delta Vf, which means that the temperature change amount of the red light chips is reduced to a set threshold T2, the input current mode of a blue chip array is restored to the DC mode.

Description

technical field [0001] The invention relates to LED light sources, in particular to a control method for fluorescent transparent ceramic high-power LED light sources. Background technique [0002] As the fourth-generation lighting source, LED has largely replaced traditional light sources in indoor and outdoor low-power application scenarios due to its high efficiency, energy saving, environmental protection, fast response, and adjustable spectrum. However, the replacement rate of ultra-high power and high power density LED lamps, such as high pole lamps and stadium lamps, is still relatively low. The main reason restricting its widespread use is due to the two factors of heat dissipation and heat resistance of the fluorescent material at the front of the LED light source. Taking a 100W LED light source as an example, the Stokes loss that occurs during the fluorescent down-conversion process will generate nearly 10W of heat. With such a small light source area, so much hea...

AI Technical Summary

Problems solved by technology

However, there are still cases where the temperature is too high under long-term high-current working conditions

When the temperature reaches a certain value, due to the large temperature difference in different areas of the fluorescent ceramics, the ceramics will be heated unevenly and cracks will occur, causing varying degrees of permanent damage to the light source, thereby shortening the service life of the light source. At the same time, The light effect will also be greatly affected by the

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