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A short-circuit protection control circuit for LED light bar

A short-circuit protection circuit and LED light strip technology, which is applied in the direction of emergency protection circuit devices, lamp circuit layout, energy-saving control technology, etc., can solve the problems of complex circuit structure, high production cost, untimely response, etc., and achieve simple peripheral devices Effect

Active Publication Date: 2014-10-22
XIAMEN PRIMA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, LED short-circuit protection circuits are usually provided to protect the LED light bar. However, these LED short-circuit protection circuits in the prior art have complex circuit structures, untimely response, and high production costs. disadvantages

Method used

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  • A short-circuit protection control circuit for LED light bar
  • A short-circuit protection control circuit for LED light bar
  • A short-circuit protection control circuit for LED light bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 , figure 2 As shown, a LED light bar short-circuit protection control circuit of the present invention includes:

[0023] An LED constant current sampling control circuit 1 is connected to the power supply circuit of the LED light bar to realize constant current control;

[0024] A switch circuit 2 is connected to the LED light bar power supply circuit, and is located between the LED light bar 10 and the power supply V_LED, and the control terminal of the switch circuit 2 is connected to the backlight control signal BACKLIGHT_ON;

[0025] An LED short-circuit protection circuit 3, the LED short-circuit protection circuit 3 is connected between the LED constant current sampling control circuit 1 and the control terminal of the switch circuit 2, the LED short-circuit protection circuit 3 includes a comparator, and the non-inverting input terminal of the comparator is connected to To the LED constant current sampling control circuit 1, the inverting input t...

Embodiment 2

[0033] see image 3 , Figure 4 As shown, the difference between the short-circuit protection control circuit for LED light bars of the present invention and the first embodiment is that there are multiple LED constant current sampling control circuits 2, and each LED constant current sampling control circuit 2 is respectively connected to the corresponding A LED light bar is connected; the non-inverting input terminal of the comparator is respectively connected with each LED constant current sampling control circuit 1, through a plurality of first diodes, so that the first LED constant current sampling control circuit 1 A triode collector stage voltage constitutes a logical relationship with and.

[0034] For example, another LED constant current sampling control circuit 1 is composed of the first transistor V7, the second transistor V6, the first resistor R14, the second resistor R12 and the third resistor R13, then the LED short-circuit protection circuit 2’s first There ...

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Abstract

The invention discloses a short-circuit protection and control circuit for an LED (Lighnt emitting Diode) strip lamp. The short-circuit protection and control circuit for the LED strip lamp comprises an LED constant current sampling and control circuit, a switching circuit and an LED short-circuit protection circuit, wherein the switching circuit and the LED constant current sampling and control circuit are respectively connected into an LED strip lamp power supply loop, a control end of the switching circuit is connected with a backlight control signal, and the LED short-circuit protection circuit is connected between the LED constant current sampling and control circuit and the control end of the switching circuit. The LED short-circuit protection circuit comprises a comparator, wherein an in-phase input end of the comparator is connected with a preset threshold signal, and control signals are output to the switching circuit by the LED short-circuit protection circuit so as to control the power supply. After the structure is adopted, the short-circuit protection and control circuit disclosed by the invention has the characteristics of simple structure, timely response and low production cost. According to different parameters of strip lamps, the constant current control circuit can be adjusted, and a reference voltage of a protection point can flexibly set, and therefore, a normal, reliable and stable operation of a product can be ensured.

Description

technical field [0001] The invention relates to backlight control technology, in particular to a control circuit for backlight control with a single-channel or multi-channel LED lamp bar short-circuit protection function. Background technique [0002] At present, liquid crystal displays are widely used. For example, liquid crystal display modules are used in electronic products such as televisions, tablet computers, notebook computers, desktop computer monitors, and mobile phones. The material of the backlight sheet generally places some high-brightness light-emitting diodes evenly in the backlight sheet. To make these display modules work normally, it is necessary to allow these light-emitting diodes, that is, LED strips, to emit light of the same brightness at the same time. The light guiding effect of the backlight will make the entire liquid crystal module emit soft and uniform light and realize the display effect. In the prior art, LED short-circuit protection circuits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02H3/08H05B37/02
CPCY02B20/42Y02B20/40
Inventor 刘亮华甘建艺骆锡钟袁元春陈庆梅
Owner XIAMEN PRIMA TECH
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