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A LED driving circuit

A technology of LED drive and voltage value, applied in electroluminescence light source, light source, electric light source and other directions, can solve problems such as safety accidents

Inactive Publication Date: 2019-01-04
上海卓弘微系统科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Embodiment Construction

[0011] 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 safety accidents and other problems. According to the analysis of the inventor, 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.

[0012] 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 dr...

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PUM

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Abstract

The invention provides an LED driving chip and an LED circuit, so as to prevent the problem that an existing LED driving chip stops working due to overtemperature, causing a safety accident. The LED driving chip comprises an error amplifier and an overtemperature identification module, which is used for identifying the overtemperature of the LED driving chip; and a voltage control module configured to replace the original reference voltage connected to the noninverting input terminal of the error amplifier with a new reference voltage when the overtemperature identification module identifies the overtemperature, wherein the voltage value of the new reference voltage is lower than the voltage value of the original reference voltage.

Description

technical field [0001] The invention relates to the field of light emitting diodes (LED, Light Emitting Diode), in particular to an LED driving chip and an LED 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 LED driving chip and an LED circuit to prevent problems such as safety accidents caused by overheating of the existing LED driving chip and ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/50Y02B20/30
Inventor 李高林
Owner 上海卓弘微系统科技有限公司