CN106455246A - Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof - Google Patents
Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof Download PDFInfo
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- CN106455246A CN106455246A CN201510504621.8A CN201510504621A CN106455246A CN 106455246 A CN106455246 A CN 106455246A CN 201510504621 A CN201510504621 A CN 201510504621A CN 106455246 A CN106455246 A CN 106455246A
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- liquid crystal
- backlight
- crystal display
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Abstract
The invention discloses a phase inverter circuit used for lightening backlight of a liquid crystal display and a driving method thereof. A shooting display, a bus, setting devices, a central controller, a driver monitor, and door side displays are provided. The front door and the rear door of the bus are respectively provided with the setting devices and the door side displays, and electron tubes are additionally disposed on the central controller and the driver monitor, and then the central controller is used to transmit the received information after being processed to the door side displays and the driver monitor. A driver can notify passengers of getting off by the shooting display or controlling the moving of the bus, and each of the setting devices is provided with at least more than two buttons. A luminescent electron tube and an inductor are disposed in each of the buttons. The central controller is provided with a device used for integrating a number and a station into one body, and then is used to transmit the number and the station to the door side displays and the driver monitor. The door side displays are provided with liquid crystal displays, and the driver monitor is provided with a digital device, and therefore a device used for communication between the passengers and the driver is provided. A structure is simple, use is convenient and practical, and cost is low.
Description
Technical field
The present invention relates to a kind of inverter circuit of the backlight for lighting liquid crystal display and its driving method, the inverter circuit of the backlight for lighting liquid crystal display and its driving method that more particularly, to a kind of fluorescent lamp uses.
Background technology
In current lighting industry, existing universal valve is made up of electrotechnical elements such as power capacitor, normally closed thermoswitch, thermal resistance coils, this electron tube has very strong vibrating noise and temperature rise, and there is light to flash, light fixture can not quickly be lighted when the power is turned on, simultaneously because line voltage is unstable, electron tube and light fixture are all easy to burn out, and cause the loss of user.
New electron tube has good improvement in some parts; circuit includes ac-dc converter circuit module, filtering useless band circuit module, orthogonal stream inverter circuit module, output device; reduce vibrating noise and control temperature rise; the quick aspects such as illumination that start are improved well; but yet suffer from considerable problem, the defencive function of such as abnormality.Common abnormality is in the following several ways：One of one lamp or several lamp do not access;Fluorescent lamp can not start because a negative electrode damages;
Although negative electrode is complete, lamp can not activate;
Fluorescent lamp operation, but one of negative electrode un-activation or rectifying effect occurs;Activator switch short circuit etc.;
Generally electron tube is supported the use with fluorescent tube, if in use, abnormality, and electron tube all can be caused to damage.As independently installed, the interchangeable electronic pipe of fluorescent tube must possess abnormity protection function, and after abnormality occurs, electron tube can not damage, and more renewing fluorescent tube, or after eliminating abnormality, electron tube should remain to be continuing with.
This is only also the protection situation of abnormality, in anti-overvoltage, surge current suppression, extends light fixture service life, multi load linkage, improves power factor, reduce harmonic wave, realize the aspects such as constant power output,
The existing electron tube of lighting industry is also much not enough.
Accordingly, it would be desirable to a kind of new inverter circuit of the backlight for lighting liquid crystal display of invention and its driving method are to solve the above problems.
Content of the invention
It is an object of the invention to provide a kind of inverter circuit of the backlight for lighting liquid crystal display and its driving method, momentary spike pulse or the interference of strong thunder and lightning of line voltage appearance can be resisted, effectively suppression heavy current, is used for using this kind lighting the inverter circuit of the backlight of liquid crystal display and its driving method be enough to solve problems of the prior art.
The present invention, in order to realize above-mentioned technical purpose, adopts the following technical scheme that:
A kind of inverter circuit of the backlight for lighting liquid crystal display and its driving method，Ac-dc converter circuit module including order electrical connection、Filtering useless band circuit module、Orthogonal stream inverter circuit module、Output device，It is characterized in that，The inverter circuit of the described backlight for lighting liquid crystal display and its driving method also include suppressing high frequency electric harmonic wave to produce the electromagnetic filter circuit of pollution to electrical network，In order to improve power factor、Reduce harmonic wave、Realize the power factor regulating circuit of constant power output，In order to prevent abnormality from producing the protection circuit of infringement to electron tube，Described electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module，Described power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module，Described protection circuit is arranged among orthogonal stream inverter circuit module.
Also include in described electromagnetic filter circuit preventing momentary spikes pulse or supertension interference from electron tube and interlock circuit are produced with the moment overpressure protection circuit module of infringement, in described moment overpressure protection circuit module, comprise zinc oxide pressure-sensitive element.
The moment that described protection circuit is also included in order to surge current suppression surpasses stream protection circuit, and it is series limiting resistor in input circuit that described moment surpasses stream protection circuit.
It is additionally included in described output device before system voltage reaches rated value in order to be supplied to the negative electrode of fluorescent lamp with pre- thermocurrent and preheating time, avoid the occurrence of glow discharge and lead to the pre- heater circuit of the startup that negative electrode sustains damage, the pre- heater circuit of described startup is by temperature-sensitive element, the filament of fluorescent lamp to be carried out being heated to a brightness temperature.
Also include in described output device dragging the multifunctional controller of the fluorescent lamp operation of two or more than two simultaneously.
Described protection circuit is to detect the size of electric current using transistor thus controlling the circuit of inverter circuit work.
Optionally, described multifunctional controller uses many lamps series resonant circuit.
Optionally, described multifunctional controller uses electric current and recommends many lamps output circuit.
Provided by the present invention for lighting the inverter circuit of backlight and its driving method design of liquid crystal display, power factor can be improved, reduce harmonic wave, realize constant power output;Can prevent abnormality from producing infringement to electron tube;Glow discharge can be avoided the occurrence of and lead to negative electrode to sustain damage, thus extending light fixture working life.
Brief description
Fig. 1 is line construction functional schematic of the present invention.
Specific embodiment
For more fully understanding the present invention, to be illustrated below by embodiment.
With reference to Fig. 1 it is illustrated that a kind of inverter circuit of backlight for lighting liquid crystal display of present invention offer and its driving method, electric including order
The ac-dc converter circuit module connecting, filtering useless band circuit module, orthogonal stream inverter circuit module, output device, the inverter circuit of the described backlight for lighting liquid crystal display and its driving method also include suppressing high frequency electric harmonic wave to produce the electromagnetic filter circuit of pollution to electrical network, in order to improve power factor, reduce harmonic wave, realize the power factor regulating circuit of constant power output, in order to prevent abnormality from producing the protection circuit of infringement to electron tube, described electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module, described power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module, described protection circuit is arranged among orthogonal stream inverter circuit module.
The electromagnetic filter circuit that the present invention provides, is made up of inductance and electric capacity.
The APFC that the present invention provides.This kind of circuit of power factor correction will use special integrated circuit, transistor and some peripheral cells, because being related to active components and parts referred to as power factor regulating circuit.
The protection circuit that the present invention provides.In normal operation, the voltage that setting auxiliary winding produces on electric capacity C2 only has 20-25V（Or it is more lower）, it is insufficient to allow circuit turn-on.Therefore audion cannot get enough base currents and trigger current, is in cut-off and off state, at this moment abnormal protection circuit is inoperative.And once abnormality, the voltage that C2 induces exceedes the trigger voltage of circuit, makes circuit turn-on, thus turn-on transistor, makes orthogonal stream inverter circuit module from service, and will not trigger again.
The moment overpressure protection circuit module that the present invention provides.A resistance in parallel in its input circuit, the line voltage momentary spike pulsecutting occurring in input circuit or amplitude limit can be made the voltage being added to electron tube reduce by it.
The moment that the present invention provides surpasses stream protection circuit, and the best approach reducing surge current is exactly to connect the resistance of a current-limiting resistance or negative temperature coefficient in input circuit, and this resistance cold resistance at ambient temperature is larger, can surge current suppression effectively.
It is supplied to negative electrode with enough electric currents and certain preheating time, reaches electron emission state in negative electrode, and before forming enough electronic fogs around negative electrode, the voltage being added to lamp tube ends should be sufficiently low, in order to avoid glow discharge, leads to negative electrode to sustain damage.
The multifunctional controller that the present invention provides, so-called multi load working line is exactly the fluorescent tube that an electron tube lights two or more than two simultaneously, and the circuit of continuous firing.This circuit has easy for installation, and unfailing performance is high, and energy-saving effect is notable, and electric network pollution is low, and the advantages of low-loss etc., the electronic circuit that the present invention adopts has two kinds：One kind is many lamps series resonance circuit, and one kind is that electric current recommends many lamps outlet line.
Above disclosed be only the preferred embodiments of the present invention, certainly the interest field of the present invention, the equivalent variations therefore made according to scope of the present invention patent can not be limited with this, still belong to the scope that the present invention is covered.
Claims (7)
1. a kind of inverter circuit of the backlight for lighting liquid crystal display and its driving method, it is characterized in that, ac-dc converter circuit module including order electrical connection, filtering useless band circuit module, orthogonal stream inverter circuit module, output device, electromagnetic filter circuit, power factor regulating circuit and protection circuit, described electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module, described power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module, described protection circuit is arranged among orthogonal stream inverter circuit module.
2. it is used for lighting the inverter circuit of backlight of liquid crystal display and its driving method the moment overpressure protection circuit module it is characterised in that also including in described electromagnetic filter circuit as claimed in claim 1.
3. the inverter circuit of backlight being used for lighting liquid crystal display as claimed in claim 1 and its driving method flow protection circuit it is characterised in that described protection circuit also included moment surpasses.
4. the inverter circuit of backlight and its driving method for lighting liquid crystal display as claimed in claim 1, it is characterized in that, it is additionally included in described output device before system voltage reaches rated value in order to be supplied to the negative electrode of fluorescent lamp with pre- thermocurrent and preheating time, avoid the occurrence of glow discharge and lead to the pre- heater circuit of the startup that negative electrode sustains damage, the pre- heater circuit of described startup is by temperature-sensitive element, the filament of fluorescent lamp to be carried out being heated to a brightness temperature.
5. the inverter circuit of backlight being used for lighting liquid crystal display as claimed in claim 1 and its driving method are it is characterised in that also include in described output device dragging the multifunctional controller of the fluorescent lamp operation of two or more than two simultaneously.
6. the inverter circuit of backlight being used for lighting liquid crystal display as claimed in claim 1 and its driving method are it is characterised in that described protection circuit is to detect the size of electric current using transistor thus controlling the circuit of inverter circuit work.
7. the inverter circuit of backlight being used for lighting liquid crystal display as claimed in claim 6 and its driving method are it is characterised in that described multifunctional controller adopts many lamps series resonant circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510504621.8A CN106455246A (en) | 2015-08-16 | 2015-08-16 | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510504621.8A CN106455246A (en) | 2015-08-16 | 2015-08-16 | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106455246A true CN106455246A (en) | 2017-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510504621.8A Pending CN106455246A (en) | 2015-08-16 | 2015-08-16 | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN106455246A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571119A (en) * | 2015-10-13 | 2017-04-19 | 肖斌 | Inverter circuit for lightening backlight of LCD |
-
2015
- 2015-08-16 CN CN201510504621.8A patent/CN106455246A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571119A (en) * | 2015-10-13 | 2017-04-19 | 肖斌 | Inverter circuit for lightening backlight of LCD |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170222 |
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| WD01 | Invention patent application deemed withdrawn after publication |