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Accurate light emitting diode (LED) driving high-temperature protection circuit

A technology of LED driving and high temperature protection, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., and can solve problems such as safety accidents

Inactive Publication Date: 2011-09-07
苏州卓能微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an accurate LED drive high temperature protection circuit to prevent the existing LED drive chip from stopping working due to overheating and causing safety accidents and other problems

Method used

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  • Accurate light emitting diode (LED) driving high-temperature protection circuit
  • Accurate light emitting diode (LED) driving high-temperature protection circuit
  • Accurate light emitting diode (LED) driving high-temperature protection circuit

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Embodiment Construction

[0012] In the existing over-temperature protection scheme, once the LED driver chip is overheated, the LED driver chip will stop working, and it is easy to cause problems such as safety accidents. The inventor analyzes that the LED driver chip current I=V ref / R sense , where Vref is the reference voltage connected to the same input terminal of the error amplifier in the LED driver chip, R sense is a current detection resistor, if the reference voltage can be reduced, the current flowing through the power tube will also be reduced, and the conduction loss and switching loss of the power tube will be reduced, thereby reducing the power consumption of the LED driver chip. As the power consumption of the chip decreases, the temperature of the chip also decreases.

[0013] Based on the above idea, the embodiment of the present invention proposes the following LED driver chip to avoid problems such as safety accidents caused by the stoppage of the existing LED driver chip when ove...

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Abstract

The invention provides an accurate light emitting diode (LED) driving high-temperature protection circuit for preventing the problems that the conventional LED driving chip stops working due to the over-temperature cause safety accidents and the like. An LED driving chip comprises an error amplifier, an over-temperature identifying module and a voltage control module, wherein the over-temperature identifying module is used for identifying the over-temperature of the LED driving chip; and the voltage control module is used for replacing the original reference voltage connected with a homonymous input end of the error amplifier with a new reference voltage when the over-temperature identification module detects the over-temperature, wherein the value of the new reference voltage is smaller than the value of the original reference voltage.

Description

technical field [0001] The invention relates to the field of Light Emitting Diode (LED, Light Emitting Diode), in particular to an LED driving integrated circuit. Background technique [0002] In order to prevent the LED driver chip from being damaged by excessive temperature, an over-temperature control circuit is usually integrated inside the LED driver chip at present. When the chip temperature exceeds a predetermined temperature, the over-temperature control circuit will control the chip to stop working to achieve the purpose of cooling. But for many application environments, the stoppage of the chip will cause losses. For example, in the working environment of the car, if the chip stops working and the LED lights of the car go out, it is easy to cause an accident. Contents of the invention [0003] The invention provides an accurate LED driving high temperature protection circuit to prevent the existing LED driving chip from stopping working due to overheating and cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 程玉华
Owner 苏州卓能微电子技术有限公司