Novel LED driving control method
A technology of LED driver and LED chip, applied in the direction of light source, electrical components, lighting device, etc., can solve the problems of output luminous flux decrease, luminous flux decrease, can not effectively improve the sharp attenuation of LED luminous flux, etc.
Inactive Publication Date: 2017-05-24
FUZHOU UNIV
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Problems solved by technology
Under constant current control, when the junction temperature of the chip rises greatly, the forward voltage of the LED will drop, the input power will drop, and the LED chip will have obvious light decay phenomenon, that is, the output luminous flux will drop obviously; under constant power control, when the junction of the chip The temperature rises greatly, and the forward voltage of the LED drops. The constant power control compensates for the voltage drop caused by the rise of the junction temperature by increasing the input current accordingly. It leads to a decrease in luminous flux, so constant power control cannot effectively improve the sharp attenuation of LED luminous flux due to temperature rise
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] like figure 1 As shown, this embodiment provides a novel LED drive control method, which mainly includes a driver, a current controller, and a compensation network. Specifically include the following steps:
[0042] Step S1: According to the LED chip, establish the LED photoelectric model, and obtain the forward current I with the luminous flux Φ and the forward voltage U as variables dAlgorithmic Model I d = f -1 (φ, U);
[0043] Step S2: In the current controller, set the reference value Φ of the required LED luminous flux ref , sample the output voltage U of the LED drive converter, and based on the forward current I obtained in step S1 d Algorithm model to get the corresponding current reference signal i ref ;
[0044] Step S3: The current reference signal i generated by the current controller ref with the output current sampling sig...
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The invention relates to a novel LED driving control method. The method is characterized in that through sampling an output voltage signal u of an LED driving circuit, the output voltage signal is sent to a current controller; and the current controller acquires a reference current signal iref corresponding to a set reference luminous flux phiref through a specific algorithm, the reference current signal iref is compared to an output current id of an LED driver so as to acquire an error signal epsilon, and acquires a control signal via a compensation network. Under control of the control signal, a driver provides a forward current signal which is the same with the reference current signal iref generated by the current controller for an LED load so that the LED load generates a luminous flux which is maintained to be consistent with the reference luminous flux phiref and luminous flux control is realized. By using the method of the invention, accurate control of an LED output luminous flux can be realized.
Description
technical field [0001] The invention relates to the field of LED drive control strategies, in particular to a novel LED drive control method. Background technique [0002] The application occasions of LED electric light sources are more and more extensive, ranging from small display and indication fields to high-tech fields such as road lighting, medical treatment, and aviation. Some of these applications only require LEDs to produce light output for simple indication, while others require precise control of LED output light. No matter what kind of application, the drive control of LED is indispensable. [0003] The current common LED drive control strategies are constant current control and constant power control. The size of the output luminous flux of the LED is not only related to the size of the forward current, but also closely related to the level of the chip junction temperature. It can be seen from the modeling analysis that the change of junction temperature wil...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 徐玉珍李俊宏
Owner FUZHOU UNIV