CN104658510A - LED backlight driver based on current control - Google Patents
LED backlight driver based on current control Download PDFInfo
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- CN104658510A CN104658510A CN201310572708.XA CN201310572708A CN104658510A CN 104658510 A CN104658510 A CN 104658510A CN 201310572708 A CN201310572708 A CN 201310572708A CN 104658510 A CN104658510 A CN 104658510A
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- module
- current control
- led backlight
- backlight driver
- driver based
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Abstract
An LED backlight driver based on current control relates to the improvement of an LED backlight driver based on current control. The invention provides an LED backlight driver based on current control which has the advantages of high conversion efficiency, high reliability, small size, and low cost. The LED backlight driver comprises a converter module, an amplifier module, a comparator module, a DC-DC module, a steering device module, and a controller, and is characterized in that the converter module, the amplifier module, the comparator module, the DC-DC module, the steering device module and the controller are connected in sequence.
Description
Technical field
the present invention relates to a kind of improvement of the LED backlight driver based on Current Control.
Background technology
current various consumer product has display screen as a kind of output terminal or man-machine interface, and this has become a kind of popular a kind of future developing trend.Display screen adopts liquid crystal display mostly, because liquid crystal has frivolous advantage, be applicable to light portable mini-plant and use, but LCD itself is not irradiative, this just needs a kind of light source to carry out backlight provides light to it.Mostly adopt CCFL at back light a few years ago, this is a kind of high voltage control mode, utilizes inverter DC voltage to be transformed into high-voltage AC signal anticathode ray tube and powers.But, along with the development of technology and the swift and violent trend of LED, utilize LED will become following a kind of developing direction as LCD backlight.But also there are some problems; As: conversion efficiency is low, reliability is low, volume is large, high in cost of production problem.
Summary of the invention
the present invention is exactly for the problems referred to above, provides that a kind of conversion efficiency is high, reliability is high, volume is little, a kind of LED backlight driver based on Current Control of low cost.
for achieving the above object, the present invention adopts following technical scheme, the present invention includes converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller, it is characterized in that: described converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller connect successively.
as a kind of preferred version, controller of the present invention is single-chip microcomputer.
beneficial effect of the present invention.
the present invention is contrasted by new and old backlight and tested can prove that LED backlight can substitute CCFL completely, and is all greatly improved from aspects such as energy-conservation and colorfulnesses.This illustrates that the Power Management Design based on Current Control LED is feasible, and this control mode based on electric current can be stable, accurately backlight illumination is controlled, brightness regulation scope is also wider than original CCFL backlight, makes to be no matter can both adjust dulcet brightness under sufficient light by day or in black night evening.
Accompanying drawing explanation
in order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
as shown in the figure, the present invention includes converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller, it is characterized in that: described converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller connect successively.
controller of the present invention is single-chip microcomputer.
the design of this circuit mainly with the PWM switch transition chip of fixed frequency, high integration for core, current-limiting resistance realizes Current Control in addition.The fixed frequency of chip is 125HZ, and input voltage can reach 76V, but needs withstand voltage high diode and electric capacity like this.The principle of work of this circuit: wherein ON/OFF is the Enable Pin of chip, turns off whole chip when low level, make chip quit work to reach minimum quiescent dissipation, to reach object energy-conservation further.The cooperation of diode and inductance produces concussion for chip provides power, and electric capacity is all as filter capacitor, and unwanted clutter in filtering output current, reduces clutter to the interference of display screen.The three road voltages provided by motherboard circuit are powered to various piece respectively, and VCC one end is to chip and other energize portions.Enable Pin voltage is a railway digital signal, the state of saturation of triode is passed through as switch when high level, utilize the resistance below chip ON/OFF pin to control the magnitude of voltage of this pin, thus open or turn off chip, time low level, triode is in cut-off state, can not form path, and ON/OFF pin can not reach cut-in voltage, thus realize turning off chip, this pin is the control to backlight switch.This pin voltage can be got by the derivation of equation below: first the voltage of Enable Pin is input to ENABLE end, by the dividing potential drop of resistance by NPN triode ON.
because LED essence is diode, so it has the volt-ampere characteristic of diode, resistance can change along with the change in voltage at two ends, and the larger resistance of voltage can in the trend reduced.The LED consumed power utilizing instrument to survey in the design is approximately 24W, but the CCFL of same brightness then needs to consume about 40W, has fully demonstrated the energy-saving effect of LED here.
be understandable that, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (2)
1. the LED backlight driver based on Current Control, comprise converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller, it is characterized in that: described converter module, amplifier module, comparator module, DC-DC module, steering gear module, controller connect successively.
2. a kind of LED backlight driver based on Current Control according to claim 1, is characterized in that: described controller is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310572708.XA CN104658510A (en) | 2013-11-18 | 2013-11-18 | LED backlight driver based on current control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310572708.XA CN104658510A (en) | 2013-11-18 | 2013-11-18 | LED backlight driver based on current control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104658510A true CN104658510A (en) | 2015-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310572708.XA Pending CN104658510A (en) | 2013-11-18 | 2013-11-18 | LED backlight driver based on current control |
Country Status (1)
| Country | Link |
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| CN (1) | CN104658510A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992901A (en) * | 2019-12-24 | 2020-04-10 | 太原航空仪表有限公司 | Backlight brightness control algorithm |
-
2013
- 2013-11-18 CN CN201310572708.XA patent/CN104658510A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992901A (en) * | 2019-12-24 | 2020-04-10 | 太原航空仪表有限公司 | Backlight brightness control algorithm |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150527 |