CN106571119A - Inverter circuit for lightening backlight of LCD - Google Patents
Inverter circuit for lightening backlight of LCD Download PDFInfo
- Publication number
- CN106571119A CN106571119A CN201510669833.1A CN201510669833A CN106571119A CN 106571119 A CN106571119 A CN 106571119A CN 201510669833 A CN201510669833 A CN 201510669833A CN 106571119 A CN106571119 A CN 106571119A
- Authority
- CN
- China
- Prior art keywords
- circuit
- inverter circuit
- backlight
- liquid crystal
- crystal display
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention discloses an inverter circuit for lightening the backlight of an LCD. The inverter circuit comprises a camera display. A bus is formed by a setter, a central controller, a driver monitor and a door edge display. The setter and the door edge display are respectively arranged on the front door and the rear door of the bus. Electric tubes are added on the central controller and the driver monitor, so that the central controller processes the received information and transmits to the door edge display and the driver monitor. A driver notifies passengers to get off the bus or control the movement of the vehicle through the camera display. At least two buttons are arranged on the setter, and lighting electric tubes and sensors are built in the buttons. Number and station setting integrated device is arranged on the central controller, and transmitted to the door edge display and the driver monitor. The door edge display is provided with a liquid display screen, and a digital device is arranged on the driver monitor to serve as a communication device between passengers and the driver. The inverter circuit is simply structured, convenient and practical and is low in cost.
Description
Technical field
The present invention relates to a kind of inverter circuit for lighting the backlight of liquid crystal display, more particularly to the inverter circuit for lighting the backlight of liquid crystal display that a kind of fluorescent lamp is used.
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, when the power is turned on light fixture can not be lighted quickly, 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 improvement well in some parts; circuit includes ac-dc converter circuit module, filtering useless band circuit module, orthogonal stream inverter circuit module, output device; reducing vibrating noise and control temperature rise; the quick aspects such as illumination that start are improved well; but considerable problem is yet suffered from, such as the defencive function of abnormality.Common abnormality is in the following several ways：One in one lamp or several lamps is without access;Fluorescent lamp can not start because a negative electrode is damaged;Although negative electrode is complete, lamp can not be activated;There is rectifying effect in a un-activation in fluorescent lamp operation, but negative electrode;Activator switch short circuit etc.;Generally electron tube is supported the use with fluorescent tube, if in use, abnormality occurs, can all cause electron tube to damage.Used as independently installed, the interchangeable electronic pipe of fluorescent tube must possess abnormity protection function, and after abnormality occurs, electron tube can not be damaged, and more renewing fluorescent tube, or eliminate after abnormality, electron tube should remain to be continuing with.
This is also only the protection situation of abnormality; in anti-overvoltage, surge current suppression, extend light fixture service life, multi load linkage, improve power factor, reduce harmonic wave, realize the aspects such as constant power output, the existing electron tube of lighting industry also has many not enough.
Accordingly, it would be desirable to invent a kind of new inverter circuit for lighting the backlight of liquid crystal display to solve the above problems.
The content of the invention
It is an object of the invention to provide a kind of inverter circuit for lighting the backlight of liquid crystal display, the momentary spike pulse or the interference of strong thunder and lightning of line voltage appearance can be resisted, the inverter circuit of heavy current, the backlight for being used to light liquid crystal display using this kind is effectively suppressed to be enough to solve problems of the prior art.
The present invention is adopted the following technical scheme that to realize above-mentioned technical purpose:
A kind of inverter circuit for lighting the backlight of liquid crystal display，Including the ac-dc converter circuit module of order electrical connection、Filtering useless band circuit module、Orthogonal stream inverter circuit module、Output device，It is characterized in that，The inverter circuit for lighting the backlight of liquid crystal display also includes the electromagnetic filter circuit for suppressing high frequency electric harmonic wave that pollution is produced to electrical network，To improve power factor、Reduce harmonic wave、Realize the power factor regulating circuit of constant power output，To prevent abnormality from the protection circuit of infringement is produced to electron tube，The electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module，The power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module，The protection circuit is arranged among orthogonal stream inverter circuit module.
Also include preventing momentary spikes pulse or supertension from disturbing the moment overpressure protection circuit module for producing electron tube and interlock circuit infringement in the electromagnetic filter circuit, zinc oxide pressure-sensitive element is included in the moment overpressure protection circuit module.
The protection circuit also includes surpassing stream protection circuit to the moment of surge current suppression, and the moment, super stream protection circuit was the series limiting resistor in input circuit.
It is additionally included in system voltage in the output device to reach before rated value to be supplied to the negative electrode of fluorescent lamp with pre- thermocurrent and preheating time, avoid the occurrence of glow discharge and cause the pre- heater circuit of startup that negative electrode sustains damage, the pre- heater circuit of the startup is by temperature-sensitive element the filament of fluorescent lamp to be carried out being heated to a brightness temperature.
Also include the multifunctional controller of the fluorescent lamp operation to drag two or more than two simultaneously in the output device.
The protection circuit is the size that electric current is detected using transistor so as to control the circuit that inverter circuit works.
Optionally, the multifunctional controller uses many lamp series resonant circuits.
Optionally, the multifunctional controller uses electric current and recommends many lamp output circuits.
Inverter circuit design provided by the present invention for lighting the backlight of liquid crystal display, can improve power factor, 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 cause negative electrode to sustain damage, so as to extend light fixture working life.
Description of the drawings
Fig. 1 is line construction functional schematic of the present invention.
Specific embodiment
To more fully understand the present invention, it is illustrated below by embodiment.
With reference to Fig. 1，A kind of inverter circuit for lighting the backlight of liquid crystal display of present invention offer is provided，Including the ac-dc converter circuit module of order electrical connection、Filtering useless band circuit module、Orthogonal stream inverter circuit module、Output device，The inverter circuit for lighting the backlight of liquid crystal display also includes the electromagnetic filter circuit for suppressing high frequency electric harmonic wave that pollution is produced to electrical network，To improve power factor、Reduce harmonic wave、Realize the power factor regulating circuit of constant power output，To prevent abnormality from the protection circuit of infringement is produced to electron tube，The electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module，The power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module，The protection circuit is arranged among orthogonal stream inverter circuit module.
The electromagnetic filter circuit that the present invention is provided, is made up of inductance and electric capacity.
The APFC that the present invention is provided.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 is provided.In normal operation, the voltage that setting auxiliary winding is produced 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, and in cut-off and off state, at this moment abnormal protection circuit does not work.Once and there is abnormality, the voltage induced on C2 exceedes the trigger voltage of circuit, makes circuit turn-on, so as to 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 is provided.A resistance in parallel in its input circuit, the line voltage momentary spike pulsecutting occurred in input circuit or amplitude limit can reduce the voltage for being added to electron tube by it.
The moment super stream protection circuit that the present invention is provided, the best approach for reducing surge current is exactly the resistance of a current-limiting resistance or negative temperature coefficient of connecting in input circuit, and resistance cold resistance at ambient temperature is larger, can effectively surge current suppression.
Negative electrode is supplied to enough electric currents and certain preheating time, in negative electrode electron emission state is reached, and formed around negative electrode before enough electronic fogs, the voltage for being added to lamp tube ends should be sufficiently low, in order to avoid there is glow discharge, cause negative electrode to sustain damage.
The multifunctional controller that the present invention is provided, so-called multi load working line is exactly an electron tube while lighting the fluorescent tube of two or more than two, and the circuit of continuous firing.This circuit has easy for installation, and unfailing performance is high, and significantly, electric network pollution is low for energy-saving effect, and the advantages of low-loss etc., the electronic circuit that the present invention is adopted has two kinds：One kind is many lamp series resonance circuits, and one kind is that electric current recommends many lamp outlet lines.
Above disclosed is only the preferred embodiments of the present invention, can not limit the interest field of the present invention, therefore the equivalent variations made according to scope of the present invention patent with this certainly, still belongs to the scope that the present invention is covered.
Claims (6)
1. a kind of inverter circuit for lighting the backlight of liquid crystal display, it is characterized in that, including the ac-dc converter circuit module of 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, the electromagnetic filter is electrically connected between voltage input end and ac-dc converter circuit module, the power factor regulating circuit is connected between ac-dc converter circuit module and filtering useless band circuit module, the protection circuit is arranged among orthogonal stream inverter circuit module.
2. the inverter circuit of the as claimed in claim 1 backlight for being used to light liquid crystal display, it is characterised in that the moment overpressure protection circuit module also included in the electromagnetic filter circuit.
3. the inverter circuit of the as claimed in claim 1 backlight for being used to light liquid crystal display, it is characterised in that the protection circuit also included moment super stream protection circuit.
4. the inverter circuit of the as claimed in claim 1 backlight for being used to light liquid crystal display, it is characterized in that, it is additionally included in system voltage in the output device to reach before rated value to be supplied to the negative electrode of fluorescent lamp with pre- thermocurrent and preheating time, avoid the occurrence of glow discharge and cause the pre- heater circuit of startup that negative electrode sustains damage, the pre- heater circuit of the 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 the as claimed in claim 1 backlight for being used to light liquid crystal display, it is characterised in that also include the multifunctional controller of the fluorescent lamp operation to drag two or more than two simultaneously in the output device.
6. the inverter circuit of the as claimed in claim 1 backlight for being used to light liquid crystal display, it is characterised in that the protection circuit is that the size of electric current is detected using transistor so as to control the circuit of inverter circuit work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510669833.1A CN106571119A (en) | 2015-10-13 | 2015-10-13 | Inverter circuit for lightening backlight of LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510669833.1A CN106571119A (en) | 2015-10-13 | 2015-10-13 | Inverter circuit for lightening backlight of LCD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106571119A true CN106571119A (en) | 2017-04-19 |
Family
ID=58508826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510669833.1A Withdrawn CN106571119A (en) | 2015-10-13 | 2015-10-13 | Inverter circuit for lightening backlight of LCD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106571119A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020047614A1 (en) * | 2000-09-21 | 2002-04-25 | Yung-Chuan Lin | Fluorescent lamp circuit structure |
| CN1700838A (en) * | 2004-05-20 | 2005-11-23 | Nec液晶技术株式会社 | Inverter circuit for lighting backlight of liquid crystal display and method for driving the same |
| CN200973197Y (en) * | 2006-11-23 | 2007-11-07 | 曹锡行 | Energy saver for fluorescent lamp |
| US20070267981A1 (en) * | 2006-05-16 | 2007-11-22 | Junzhong Peng | Power-Saving and Stabilizing Ballast |
| CN101140381A (en) * | 2006-09-07 | 2008-03-12 | 奇美电子股份有限公司 | Backlight module, LCD device and lamp tube retaining element |
| CN101282608A (en) * | 2007-04-02 | 2008-10-08 | Lg.菲利浦Lcd株式会社 | Lamp driving apparatus for liquid crystal display device |
| CN101661708A (en) * | 2008-08-26 | 2010-03-03 | 奇美电子股份有限公司 | Display, driving device and driving method thereof |
| CN102290031A (en) * | 2011-08-26 | 2011-12-21 | 友达光电股份有限公司 | Light-adjusting structure for backlight module of liquid crystal panel |
| CN106455246A (en) * | 2015-08-16 | 2017-02-22 | 刘新梅 | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof |
-
2015
- 2015-10-13 CN CN201510669833.1A patent/CN106571119A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020047614A1 (en) * | 2000-09-21 | 2002-04-25 | Yung-Chuan Lin | Fluorescent lamp circuit structure |
| CN1700838A (en) * | 2004-05-20 | 2005-11-23 | Nec液晶技术株式会社 | Inverter circuit for lighting backlight of liquid crystal display and method for driving the same |
| US20070267981A1 (en) * | 2006-05-16 | 2007-11-22 | Junzhong Peng | Power-Saving and Stabilizing Ballast |
| CN101140381A (en) * | 2006-09-07 | 2008-03-12 | 奇美电子股份有限公司 | Backlight module, LCD device and lamp tube retaining element |
| CN200973197Y (en) * | 2006-11-23 | 2007-11-07 | 曹锡行 | Energy saver for fluorescent lamp |
| CN101282608A (en) * | 2007-04-02 | 2008-10-08 | Lg.菲利浦Lcd株式会社 | Lamp driving apparatus for liquid crystal display device |
| CN101661708A (en) * | 2008-08-26 | 2010-03-03 | 奇美电子股份有限公司 | Display, driving device and driving method thereof |
| CN102290031A (en) * | 2011-08-26 | 2011-12-21 | 友达光电股份有限公司 | Light-adjusting structure for backlight module of liquid crystal panel |
| CN106455246A (en) * | 2015-08-16 | 2017-02-22 | 刘新梅 | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2907170Y (en) | Power-saving voltage regulation and ballasting device | |
| CN201383889Y (en) | LED circuit | |
| CN100521859C (en) | Variable frequency preheating restartable fluorescent lamp electronic relay with abnormal protection | |
| JP2013009475A (en) | Surge current suppression circuit | |
| CN202396068U (en) | Electronic ballast of metal halogen lamp | |
| CN106455246A (en) | Phase inverter circuit used for lightening backlight of liquid crystal display and driving method thereof | |
| CN106455247A (en) | Bus arrival reminding system | |
| KR20140142134A (en) | LED lamp driving device operating connected to the ballast for fluorcent lamp and the LED lamp comprising the driving device | |
| CN218830718U (en) | Turn-off afterglow eliminating circuit and LED driving power supply | |
| US11317496B2 (en) | LED lamp circuit | |
| CN106571119A (en) | Inverter circuit for lightening backlight of LCD | |
| CN106572582A (en) | Fluorescent lamp control system with filter circuit | |
| CN106572583A (en) | Prompting system for arrival of bus at bus stop | |
| CN106535449A (en) | Multifunctional ballast | |
| CN106535424A (en) | LED lamp with surge current suppression circuit | |
| KR101784857B1 (en) | Driving Device of LED Lamp Compatable with a circle, FPL and Fluorescent Lamp Stabilizer | |
| CN106572570A (en) | Fluorescent lamp with short circuit protection circuit | |
| CN205017668U (en) | Resist electron tube of instantaneous spike voltage | |
| CN105792488A (en) | Energy-saving ballast with power correction function | |
| CN205017669U (en) | Energy -concerving and environment -protective electron tube | |
| CN204377233U (en) | Ballast | |
| CN204350426U (en) | Ballast | |
| CN2845392Y (en) | Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting | |
| CN202818746U (en) | Electronic energy saving lamp high-power factor circuit | |
| CN105813359A (en) | Multifunctional ballast |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170419 |