Light bar anti-overshoot protection circuit and backlight module
A protection circuit, anti-overshoot technology, applied in the direction of electric light source, electroluminescence light source, light source, etc., can solve the problem of LED lamp current overshoot and other problems
Active Publication Date: 2022-07-12
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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Problems solved by technology
[0005] The invention provides an anti-overshoot protection circuit and a backlight module for a light bar, aiming to solve the problem that the LED light bar has parasitic capacitance in the prior art, and the LED light easily causes the LED light current to overshoot when charging
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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0039] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingl...
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The invention discloses a light bar anti-overshoot protection circuit and a backlight module, wherein the light bar anti-overshoot protection circuit includes a boost chopper circuit, a constant current drive circuit, a light-emitting diode LED lamp group circuit and an anti-overshoot protection component ; The current output end of the boost chopper circuit is electrically connected with the current input end of the LED lamp group circuit; the constant current drive circuit includes a constant current drive control chip and a dimming field effect MOS tube that are electrically connected to each other; wherein, the constant current drive control The enabling terminal of the chip is electrically connected to the boost chopper circuit, the gate of the dimming MOS tube is electrically connected to the constant current drive control chip, the drain of the dimming MOS tube is connected to the current output terminal of the LED lamp group, and the dimming MOS tube is electrically connected to the current output terminal of the LED lamp group. The source of the tube is grounded; the anti-overshoot protection component includes: a gate boosting regulating circuit, and the grid boosting regulating circuit is connected to the line between the constant current driving control chip and the dimming MOS tube. The technical solution of the present invention aims to solve the problem of parasitic capacitance in the LED light bar in the prior art, and the overshoot of the current of the LED light is easily caused when the LED is charged.
Description
technical field [0001] The invention relates to the technical field of liquid crystal televisions, in particular to a light bar anti-overshoot protection circuit and a backlight module. Background technique [0002] The backlight source is an important guarantee for the high-quality picture quality of LCD TVs. At present, the best-selling LCD TVs on the market, such as smart TVs, 4K LED TVs and ultra-high-definition TVs, all use LED lights as the backlight source. The LED light needs to be powered on to emit light. The existing LED lights are all arranged on the LED light bar, and the LED light bar is powered on to emit light and heat. Due to the heating of the LED lamp, the consumption of the entire backlight module where the LED strip is located accounts for more than 70% of the power of the whole machine, which makes the backlight module easy to overheat and affects the display efficiency and service life of the LCD screen. At present, in LCD TVs, most of the LED light b...
Claims
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IPC IPC(8): H05B33/02H05B45/50
CPCY02B20/30
Inventor 李亚伟袁博胡向峰杨寄桃黄德强盘桥富鲍晓杰
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD