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Constant-current light emitting diode (LED) power supply with temperature compensation function

A LED power supply and temperature compensation technology, which is applied in the direction of electric light source, light source, lamp circuit layout, etc., can solve the problems of absence, damage, and low LED life, and achieve the effects of reducing heat generation, prolonging service life, and reducing costs

Inactive Publication Date: 2013-02-13
HONGLI LIGHTING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, the driving current of most LEDs is designed as a constant current source that does not vary with temperature. Therefore, when the ambient temperature of the LED is higher than the safe temperature point, the operating current is not in the safe area, which will cause the life of the LED to be much lower than the specification The value of the book is even directly damaged

Method used

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  • Constant-current light emitting diode (LED) power supply with temperature compensation function
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Embodiment Construction

[0018] The present invention will be further described below in conjunction with drawings and embodiments. The invention is used for AC 220V input, LED lighting with temperature compensation and constant current output, including the following parts:

[0019] 1. EMI / EMC circuit. Prevent electromagnetic interference between the outside world and the controller.

[0020] 2. Bridge rectification. Used to convert AC input to DC Vbus1.

[0021] 3. Switching power converter IC1, the model can be VIPER28 and peripheral circuits.

[0022] 4. Transformer. It is used to change the high voltage DC Vbus1 into a low voltage DC Vs.

[0023] 5. Voltage limiting control circuit. Used to limit the DC voltage Vs within a certain range.

[0024] 6. Constant current chip IC2, the model can be PT4115. Make the output constant current with temperature compensation at the same time.

[0025] Such as figure 1 Shown: According to the division of functional modules, the present invention incl...

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Abstract

The invention discloses a constant-current light emitting diode (LED) power supply with a temperature compensation function. The constant-current LED power supply comprises an electromagnetic interference (EMI) / electromagnetic compatibility (EMC) module and a bridge type rectification module which are connected in series with each other, a switch power direct current to direct current (DC-DC) conversion module and a constant-current temperature compensation module, wherein the output of the bridge type rectification module is connected with the input end of the switch power DC-DC conversion module; the output end of the switch power DC-DC conversion module is connected with the input end of the constant-current temperature compensation module; and the output end of the constant-current temperature compensation module is connected to an LED light source. On the basis of constant-current output, an LED temperature compensation circuit is added, so that overtemperature protection of an LED lamp is realized, and the service life of an LED is greatly prolonged; moreover, the working temperature of the LED is controlled, so that when heat of the LED is reduced, the space temperature of the lamp is also reduced; and therefore, the working ambient temperature of the LED power supply is reduced, the device loss is reduced, and the service life of the power supply is prolonged.

Description

technical field [0001] The invention relates to a LED lamp power supply, in particular to a constant current LED power supply with lamp over-temperature protection. Background technique [0002] LED (Light Emitting Diode), a light-emitting diode, is a solid-state semiconductor device that can directly convert electrical energy into light energy. As a new lighting method, LED has the advantages of long life, low energy consumption, no mercury pollution, flexible application, etc., and has broad development prospects. However, compared with other light sources, high-power LEDs generate extremely high heat, and 75% to 85% of the power consumption used to drive LEDs is finally converted into heat energy. Excessive heat will reduce the light output of LEDs and produce color casts, speeding up LEDs. Ageing. [0003] The product specifications of high-power LEDs will indicate the maximum allowable output current curves at different ambient temperatures (or the temperature of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 周梅凤吕国峰杨晓东李峰
Owner HONGLI LIGHTING GRP
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