Overcurrent protection method and system

A protection system and overcurrent technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, electrical components, etc. question

Active Publication Date: 2019-06-21
XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above two over-current protection methods will trigger the screen-off mechanism when certain conditions are met, but there are certain errors in the detection process, because the current will be high when the LCD panel operates more complex screens, and the detection During the process, there are situations such as shutdown and other temperature drops. If there is an error in the detection, it is easy to misjudgment and kill the screen.
And once the screen is off, the LCD screen will not work, seriously affecting the user experience

Method used

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  • Overcurrent protection method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] See image 3 , image 3 A schematic flow chart of an overcurrent protection method provided by an embodiment of the present invention; the overcurrent protection method includes:

[0059] Step a, obtaining the detection current of the detection area of ​​the display panel and determining the temperature of the detection area according to the temperature mapping relationship;

[0060] Step b. When the temperature is greater than or equal to a first threshold, limit the current in the detection area.

[0061] The embodiment of the present invention can dynamically and accurately calculate the temperature in the overcurrent area, and perform current limiting processing when the temperature exceeds the threshold value, so as to avoid overkill phenomenon caused by misjudgment.

Embodiment 2

[0063] In this embodiment, on the basis of the foregoing embodiments, a detailed description of the overcurrent protection method will be focused on.

[0064] S01: Obtain the detection current of the detection area of ​​the display panel and determine the temperature of the detection area according to the temperature mapping relationship;

[0065] Wherein, the temperature mapping relationship is the mapping relationship between the detection current, temperature change rate, and saturation temperature, namely:

[0066] (dT,T n )=f(I);

[0067] Wherein, I is the detection current, dT is the temperature change rate, T n is the saturation temperature. Wherein, the current levels are different detection current levels.

[0068] Preferably, the temperature mapping relationship is a temperature mapping relationship table, and the temperature change rate includes: temperature rising rate and temperature falling rate, satisfying the following mapping relationship:

[0069] (dT u...

Embodiment approach

[0084] Among them, another implementation manner of using a current limiting processing method is as follows:

[0085] According to the temperature mapping relationship to find less than the first current class I i The second current class I j , satisfying: dT up,i +dT down,i -dT down,j nj for I j The saturation temperature of , where i, j are integers.

[0086] When the current limiting method is multi-stage current limiting processing, it can avoid abnormal display caused by instantaneous low current. Take the setting of two-stage current limiting as an example. At this time, the second threshold needs to be set. At this time, the first threshold and the second threshold form a current reduction zone, wherein the second threshold satisfies:

[0087] Melting screen temperature > second threshold > first threshold

[0088] If after the first stage of current limiting processing, if the rate of temperature change after the current limiting is less than 0, the temperature...

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Abstract

The invention relates to an overcurrent protection method and system. The overcurrent protection method comprises the following steps: step a, acquiring a detection current of a detection area of a display panel and determining the temperature of the detection area according to a temperature mapping relation; and step b, when the temperature is greater than or equal to a first threshold value, performing current limiting processing on the current of the detection area. The temperature of the detection area of the display panel is dynamically calculated, the temperature can be more accurately positioned, current limiting processing is carried out when the temperature exceeds the temperature threshold value, the over-killing phenomenon caused by misjudgment is avoided, current rises automatically when the temperature is lower than the temperature threshold value, and the self-recovery function is achieved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an overcurrent protection method and system. Background technique [0002] Liquid crystal display, referred to as LCD in English, and its full name is Liquid Crystal Display, is a kind of flat-panel display. It is used for the screen display of TV and computer. The advantages of the display are low power consumption, small size and low radiation. The LCD panel is the material that determines the brightness, contrast, color, and viewing angle of the LCD display. The price trend of the LCD panel directly affects the price of the LCD display. The quality and technology of the LCD panel are related to the overall performance of the LCD display. [0003] In recent years, the internal circuit design of the LCD panel has become more and more complex. When there is a foreign object inside the panel and the panel is short-circuited, the short-circuit area will have too much...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 吴永良
Owner XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD
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