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: 2020-04-10
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, 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 accordingly. ...
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The invention discloses a light bar anti-overshoot protection circuit and a backlight module. The light bar anti-overshoot protection circuit comprises a boost chopper circuit, a constant-current drive circuit, a light-emitting diode LED lamp group circuit, and an anti-overshoot protection assembly. The current output end of the boost chopper circuit is electrically connected with the current input end of the LED lamp group circuit, and the constant-current drive circuit comprises a constant-current drive control chip and a dimming field effect MOS tube which are electrically connected with each other, wherein the enabling end of the constant-current drive control chip is electrically connected with the boost chopper circuit, the grid electrode of the dimming MOS tube is electrically connected with the constant-current drive control chip, the drain electrode of the dimming MOS tube is connected with the current output end of the LED lamp set, and the source electrode of the dimming MOStube is grounded. The anti-overshoot protection assembly comprises a grid boost adjusting circuit, and the grid boost adjusting circuit is connected to a circuit between the constant-current drive control chip and the dimming MOS tube. According to the technical scheme, the problems that in the prior art, parasitic capacitance exists in an LED lamp strip, and LED lamp current overshoot is likelyto be caused when an LED and the like are charged, are solved.
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