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Method for controlling illuminative high-power LED

A control method and high-power technology, which are applied in the field of high-power LED control for lighting, can solve the problem that the electrical parameters and temperature coefficients of LED integrated circuits are not completely consistent, restrict the popularization and application of high-power LED integrated circuits, and uneven current distribution in integrated circuits, etc. problems, to achieve a wide range of industrial use value, control method or function improvement, improve stability and service life effect

Inactive Publication Date: 2009-10-14
陈有欣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can add constant current control to the external power supply circuit, it still cannot solve the problem that the electrical parameters and temperature coefficients of multiple monomers in the LED integrated circuit are not completely consistent, so it is very easy to cause uneven current distribution in the integrated circuit. situation, which will cause the individual or part of the integrated circuit to burn out quickly, and then a vicious circle, resulting in permanent burning of the integrated circuit as a whole
This situation is very common in practical applications, and there is no good solution at present, which restricts the popularization and application of high-power LED integrated circuits

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] Simpler, the present invention can use circuit elements such as resistors and resistance-capacitance networks to form a classic current sharing circuit. When the current flowing through a certain LED monomer group increases and is greater than other LED monomer groups, the current sharing circuit The current also increases, and the voltage at both ends of the current equalizing circuit increases, forcing the current of the LED monomer group to be distributed to other LED monomer groups, so as to achieve the effect of evenly distributing the current among the LED monomer groups.

Embodiment 2

[0024] see figure 1 As shown, the present invention can also be improved on the basis of Embodiment 1, and is realized through the following steps:

[0025] Step 1, setting the reference signal;

[0026] Step 2: Sampling and amplifying the circuit parameters of each LED monomer group to obtain a sampled and amplified signal;

[0027] Step 3, comparing the sampled amplified signal with the reference signal;

[0028] Step 4, when the sampled and amplified signal of a certain LED monomer group deviates from the reference signal, the current of the LED monomer group is adjusted.

[0029] Step five, when the current of one LED monomer group is greater than that of other LED monomer groups, distribute the current to other LED monomer groups.

[0030] The sampling of the above-mentioned step 2 and the step 5 can be realized simultaneously through a current sharing circuit composed of a resistor or a resistance-capacitance network, and the current sharing circuit, amplification cir...

Embodiment 3

[0033] see figure 2 Shown, the present invention can also be realized through the following steps:

[0034] Step 1, setting reference parameters, generating a modulation signal, and superimposing the reference parameters and the modulation signal to synthesize a pulse reference signal;

[0035] Step 2: Sampling and amplifying the circuit parameters of each LED monomer group to obtain a sampled and amplified signal;

[0036] Step 3, comparing the sampled amplified signal with the pulse reference signal to obtain a PWM pulse signal;

[0037] Step 4, when the PWM pulse signal shows that the sampled and amplified signal of a certain LED monomer group deviates from the pulse reference signal, the current of the LED monomer group is adjusted.

[0038] Step five, when the current of one LED monomer group is greater than that of other LED monomer groups, distribute the current to other LED monomer groups.

[0039] Preferably, the sampling in step 2 and step 5 can be realized simul...

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Abstract

The invention relates to a method for controlling an illuminative high-power LED, in particular to a method for managing a plurality of single-LEDs in groups. The method comprises the steps of: carrying out current sharing control and leading a group of single-LEDs with current greater than that of other groups of single-LEDs to distribute current to other groups of single-LEDs. The method for controlling the illuminative high-power LED can regulate work current in a unified manner, keep constant state and equal distribution of the work current, and guarantee uniformity between electrical parameter and temperature coefficient of the single-LED so as to effectively enhance stability and service life of the illuminative high-power LED.

Description

technical field [0001] The invention relates to an LED control method, in particular to a high-power LED control method for lighting. Background technique [0002] LED lighting equipment has been more and more widely used in recent years due to its advantages of low heat generation and low power consumption. At present, the common high-power LED integrated circuits for lighting in the market adopt a square array structure with multiple groups connected in parallel, and centrally drive and control the electrical parameters and temperature coefficients of multiple LED monomers inside the integrated circuit. The temperature coefficient of LED is very large. Usually, the temperature coefficient of a single LED is -2mv / °C. That is to say, the temperature coefficient of a 10-string LED monomer group is -20mv / °C. The turn-on voltage of the body group will be reduced by 1v, and under the condition of constant supply voltage, the turn-on voltage of the LED will be reduced by 1v, whi...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 陈有欣
Owner 陈有欣
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