A control method for fluorescent transparent ceramic high-power LED light source

Abstract

A control method for fluorescent transparent ceramic high-power LED light source, which divides the blue LED chip array of the high-power light source into several regions; adds an equal amount of red LED chips to the blue chips in each partition; and the red light chip are each controlled by a separate current source, keeping the current of the red light chip constant, and monitoring the change value ΔVf of the forward voltage drop of the red light chip within a selected time period through the A / D module in real time, according to ΔT= ΔVf / k is the temperature change ΔT of the red light chip. If ΔT exceeds the limited threshold T1, the output mode of the current source of the blue light chip in the partition is adjusted through the MCU microcontroller, and the line current is changed from a DC current mode to a preset pulse. In the current mode, when the voltage drop of the red chip is less than ΔVf, that is, when the temperature change of the red chip drops to the set threshold T2, the input current mode of the 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...

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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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