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LED driving circuit and method

A technology of LED driver and LED module, which is applied in the electronic field, can solve problems such as affecting the luminous effect and rising ambient temperature, and achieve the effects of stable LED luminous brightness, simple circuit and low cost

Inactive Publication Date: 2019-02-22
东莞锐视光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the purpose of the present invention is to provide an LED driving circuit and method to solve the above-mentioned prior art in which the ambient temperature rises due to the heat generated by the LED light source and thus affects its performance. The problem of its own luminous effect has achieved technical effects such as stable luminescence, low cost, and simple circuit

Method used

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Examples

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Effect test

Embodiment 1

[0027] This embodiment is an LED drive circuit, such as figure 2 As shown, it includes: an LED module 22, a current limiting module 23 and a power supply module 21; the power supply module 21 includes a constant current integrated chip 210 for supplying power to the LED module; the current limiting module 23 includes a certain value resistor R21 , one end of the fixed-value resistor R21 is connected to the output end 212 of the constant current integrated chip, the other end is connected to the input end 221 of the LED module 22, and the output end 222 of the LED module 22 is grounded; it is characterized in that the current limiting module 23 It also includes a temperature sensing resistor unit 232 , the temperature sensing resistor unit 232 is connected in parallel with the fixed value resistor R21 , and the temperature sensing element of the temperature sensing resistor unit 232 is placed at the LED module 22 .

[0028] In the prior art, the LED light source generates heat...

Embodiment 2

[0033] In another embodiment of the present invention, a LED driving method is applied to an LED module, such as figure 2 shown, including steps:

[0034] S100, providing a power supply module, the power supply module supplies power to the LED module;

[0035] S200, providing a resistor with a certain value, and the resistor with a certain value is connected in series with the LED module to limit the current of the LED module from being too large;

[0036] S300, providing a temperature sensing resistance unit connected in parallel with the fixed value resistance, the temperature sensing resistance unit obtains the ambient temperature of the LED module;

[0037] When the ambient temperature of the LED module increases, step S400 is executed, and the resistance value of the temperature sensing resistance unit decreases;

[0038] When the ambient temperature of the LED module decreases, step S500 is executed, and the resistance value of the temperature sensing resistance unit ...

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Abstract

The invention provides an LED driving circuit, comprising: an LED module, a current limiting module and a power supply module; wherein the power supply module comprises a constant-current integrated chip for supplying power to the LED module; the current limiting module comprises a fixed-value resistor; one end of the fixed-value resistor is connected to the output end of the constant-current integrated chip, and the other end of the fixed-value resistor is connected to the input end of the LED module; the output end of the LED module is grounded; the current limiting module further includes atemperature sensing resistor unit connected in parallel with the fixed-value resistor; and the temperature sensing element of the temperature sensing resistor unit is placed at the LED module. The temperature sensing resistor unit is added to a conventional LED driving circuit for monitoring the ambient temperature of the LED module. The technical solution of the invention solves the problem thatthe brightness is affected by the increase of the ambient temperature of the LED light source in the prior art, and realizes technical effects of simple circuit, low cost, and stable LED brightness.

Description

technical field [0001] The invention relates to electronic technology, in particular to an LED driving circuit and method. Background technique [0002] At present, in the field of machine vision light sources, based on the use of LED constant current drive, the brightness of the light source is controlled by setting the current, and the brightness and current of the LED (light-emitting diode) are proportional to each other, that is, when the current passing through is large, the brightness of the light source is high and the current passing through Hourly light source brightness is low. [0003] for example figure 1 It is an existing LED drive circuit, including a constant current integrated chip 110, its input terminal 111 is connected to a DC power supply, its output terminal 112 is connected to one end of a fixed value resistor R11, and the other end of the fixed value resistor R11 is connected to The input terminal 121 of the LED module 120 is connected, and the outpu...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/10H05B45/37
Inventor 张锡强肖金荣王晶晶
Owner 东莞锐视光电科技有限公司