CN201515534U - Backlight drive current balance device - Google Patents
Backlight drive current balance device Download PDFInfo
- Publication number
- CN201515534U CN201515534U CN2009201318016U CN200920131801U CN201515534U CN 201515534 U CN201515534 U CN 201515534U CN 2009201318016 U CN2009201318016 U CN 2009201318016U CN 200920131801 U CN200920131801 U CN 200920131801U CN 201515534 U CN201515534 U CN 201515534U
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- current
- current transformer
- fluorescent tube
- balanced
- currents
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- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The utility model discloses a backlight drive current balance device comprising a balance board and a circuit control board, wherein the balance board comprises at least more than two lamp tubes, a current transformer, another current transformer and a rectifying circuit, wherein the at least more than two lamp tubes are connected together in series, and each lamp tube is connected in series with a current transformer used for balancing currents; the other current transformer is connected in series with the lamp tubes and used for sampling currents; and the rectifying circuit is connected with the current transformer used for sampling currents. The circuit control board is electrically connected with the balance board and comprises a drive controller used for being electrically connected with the rectifying circuit, and a power supply module connected with the drive controller. The backlight drive current balance device detects the currents in circuits by the current transformer, and controls the currents transmitted to the lamp tubes by controlling duty cycle when the currents of the lamp tubes change, thus achieving the uniform currents of the lamp tubes, and leading the service lives of all lamp tubes to be the same.
Description
Technical field
The utility model relates to LCD backlight electric power field, relates in particular to a kind of backlight drive current balancing device.
Background technology
(Liquid Crystal Display, LCD) panel is used in the various application from mancarried electronic aid to the stationary positioned unit LCD, television set for example, video camera, automatic station-keeping system, PC on knee and industrial machine etc.But itself can not luminously be illuminated the LCD panel from the back side by light source, the backlight that is used usually be cold-cathode fluorescence lamp (Cold Cathode Fluorescent Lamp, CCFL).According to the shape of LCDs, the difference of size, a display screen often needs many tubes to make backlight, because the characteristic of CCFL and the difference of inverter system thereof, be easy to cause and flow through the lamp tube current imbalance, if lamp current differs greatly, can influence the uniformity of screen intensity on the one hand, can reduce because of some lamp tube current make the life-span of fluorescent tube too greatly on the other hand.
The utility model content
In view of above-mentioned existing in prior technology problem, the utility model embodiment provides a kind of backlight drive current balancing device, can reach each lamp tube current of balance by increasing a detection module.
In order to solve the problems of the technologies described above, the utility model embodiment has proposed a kind of backlight drive current balancing device, comprises balance plate and circuit control panel, wherein:
Described balance plate comprises plural at least fluorescent tube, described plural fluorescent tube is cascaded, and all be in series with the current transformer that is used for balanced balanced current with each fluorescent tube in the described plural at least fluorescent tube, and the current transformer that series connection one is used for sampling current on described plural fluorescent tube, and the rectification circuit that is connected with the described current transformer that is used for sampling current;
Described circuit control panel is electrically connected with balance plate, comprises being used for the driving governor that is electrically connected with described rectification circuit, and the power module that is connected with driving governor, and the current transformer of the balanced balanced current in described power module and the described balance plate is electrically connected.
Implement the utility model embodiment, has following beneficial effect: by on balance plate, increasing the size that current transformer comes electric current in the testing circuit, as long as a lamp tube current changes and will cause the variation of entire circuit, control duty ratio by circuit control panel then, electric current after the control is sent to power module, power module conveys electrical current on each fluorescent tube again, thereby reaches unified lamp current.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the backlight drive current balancing device structural representation that the utility model provides;
Fig. 2 is the circuit system schematic diagram of the backlight drive current balancing device that provides of the utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1, the backlight drive current balancing device structural representation that Fig. 1 provides for the utility model, described device comprises balance plate 1 and circuit control panel 2, wherein:
Described balance plate 1 comprises plural at least fluorescent tube 11, and all is in series with current transformer 12 summation current transformers 13 that are used for balanced balanced current, the current transformer 14 that is used for sampling current and rectification circuit 15 with each fluorescent tube in the described plural at least fluorescent tube.
Concrete, balance plate 1 comprises plural at least fluorescent tube 11, described fluorescent tube 11 is a cathode fluorescent tube, in the middle of practical operation, generally can adopt a plurality of cathode fluorescent tubes, each cold-cathode tube reaches series connection in succession by connecting with the secondary of the current transformer 12 that is used for balanced balanced current and the secondary that is used for the current transformer 13 of balanced balanced current, reaches being connected in series of current transformer 12 that is used for balanced balanced current and the current transformer 13 that being used for balanced balanced current thereby connect with the former limit of the current transformer 13 that is used for balanced balanced current in the former limit that is used for the current transformer 12 of balanced balanced current and the secondary that is used for the current transformer 12 of balanced balanced current is connected with the secondary of the current transformer 13 that is used for balanced balanced current.The electric current that is used for balanced balanced current is mutual
When the electric current that detects fluorescent tube 11 when the current transformer 12 that is used for balanced balanced current or the current transformer 13 that is used for balanced balanced current changes, current signal on the current transformer 14 sampling fluorescent tubes 11, and the current signal that sampling obtains is sent in the middle of the rectification circuit 15,15 pairs of current signals of rectification circuit carry out halfwave rectifier, remove the negative half-cycle of electric current, convert current signal to voltage signal then, the value of regulation voltage, make voltage signal steady, the voltage signal after last rectification circuit 15 will be regulated is transferred in the circuit control panel 2 by electrical connection.
Described circuit control panel 2 is electrically connected with described balance plate 1, comprises driving governor 21, power module 22.
Concrete, driving governor 21 is electrically connected with rectification circuit 15, and is connected with power module 22, and power module 22 is electrically connected with the current transformer that is used for balanced balanced current in the balance plate 1.Circuit control panel 2 is electrically connected with balance plate 1, receive the voltage signal that balance plate 1 transmits, the triangular wave of this voltage signal and chip built-in is compared, generation pulse width modulation (Pulse WidthModulation, PWM) signal is if the voltage signal of sampling increases, the duty ratio that driving governor 21 in the circuit control panel 2 is regulated pwm signal, duty ratio is reduced, thereby the energy that reaches transmission reduces, electric current descends; If the voltage signal of sampling reduces, the duty ratio that the driving governor 21 of circuit control panel 2 is regulated pwm signal increases duty ratio, thereby the energy that reaches transmission increases, and electric current rises.Energy delivery after will regulating by driving transformer 22 then is in power module 23, and control power module 23 is transferred to the size of current of fluorescent tube 11, thereby the electric current on the control fluorescent tube makes the electric current on each fluorescent tube reach unified.
Referring to Fig. 2, the circuit theory diagrams of the backlight drive current balancing device that Fig. 2 provides for the utility model.This circuit comprises at least one block of balance plate and a circuit control panel, need to prove, be that example describes only in the present embodiment with a balance plate and a circuit control panel, when lamp tube current changes on a certain branch road on detecting balance plate, current signal on the current transformer T1 sampling fluorescent tube, and the current signal that sampling obtains is sent in the middle of the rectification circuit, rectification circuit carries out halfwave rectifier to current signal, remove the negative half-cycle of electric current, resistance R 1 and R2 constitute a dividing potential drop circuit, convert current signal to voltage signal, the value of regulation voltage, C is used for filtering makes voltage signal steady, and the voltage signal after last rectification circuit will be regulated is transferred in the circuit control panel by electrical connection.Circuit control panel is electrically connected with balance plate, the voltage signal that the receiving balance plate transmits, the triangular wave of this voltage signal and chip built-in is compared, produce pwm signal, if the voltage signal of sampling increases, the driving governor in the circuit control panel is regulated the duty ratio of pwm signal, and duty ratio is reduced, thereby the energy that reaches transmission reduces, and electric current descends; If the voltage signal of sampling reduces, the driving governor of circuit control panel is regulated the duty ratio of pwm signal, and duty ratio is increased, thereby the energy that reaches transmission increases, and electric current rises.Energy delivery after will regulating by driving transformer then is in power module, and the control power module is transferred to the lamp tube current size, makes every lamp tube current controlled amount, between each fluorescent tube balance force to obtain by balancing current transformer.Because the former limit series connection of current transformer, so the primary current I of each current transformer
1Equate, and the secondary of current transformer is connected with cathode fluorescent tube, so I
2Promptly be the electric current of cold cathode fluorescent lamp, according to current transformer current balance type formula:
I
1/I
2＝N
2/N
1
Can draw that the electric current of each cathode fluorescent tube equates, thereby the electric current that reaches on the control fluorescent tube makes the electric current on each fluorescent tube unified.
In sum, implement the utility model by on balance plate, increasing the size that current transformer comes electric current in the testing circuit, as long as a lamp tube current changes and will cause the variation of entire circuit, control duty ratio by control board then, electric current after the control is sent to power module, and power module conveys electrical current on each fluorescent tube again, thereby reaches unified lamp current, make be consistent the useful life of each fluorescent tube, improve the uniformity of screen intensity.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (4)
1. a backlight drive current balancing device is characterized in that, comprises balance plate and circuit control panel, wherein:
Described balance plate comprises plural at least fluorescent tube, described plural fluorescent tube is cascaded, and all be in series with the current transformer that is used for balanced balanced current with each fluorescent tube in the described plural at least fluorescent tube, and the current transformer that series connection one is used for sampling current on described plural fluorescent tube, and the rectification circuit that is connected with the described current transformer that is used for sampling current;
Described circuit control panel is electrically connected with balance plate, comprises being used for the driving governor that is electrically connected with described rectification circuit, and the power module that is connected with driving governor, and the current transformer of the balanced balanced current in described power module and the described balance plate is electrically connected.
2. device as claimed in claim 1 is characterized in that, each fluorescent tube in the described plural at least fluorescent tube is in series with two current transformers that are used for balanced balanced current.
3. device as claimed in claim 2 is characterized in that, described fluorescent tube is a cathode fluorescent tube.
4. device as claimed in claim 1 is characterized in that, described balance plate is at least more than one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201318016U CN201515534U (en) | 2009-05-12 | 2009-05-12 | Backlight drive current balance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201318016U CN201515534U (en) | 2009-05-12 | 2009-05-12 | Backlight drive current balance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201515534U true CN201515534U (en) | 2010-06-23 |
Family
ID=42486943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201318016U Expired - Fee Related CN201515534U (en) | 2009-05-12 | 2009-05-12 | Backlight drive current balance device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201515534U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098842A (en) * | 2011-01-11 | 2011-06-15 | 杭州电子科技大学 | Current transformer-based light-emitting diode (LED) driving circuit |
| CN110969868A (en) * | 2019-11-28 | 2020-04-07 | 中冶京诚工程技术有限公司 | Control method, device and system of traffic signal lamp |
-
2009
- 2009-05-12 CN CN2009201318016U patent/CN201515534U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098842A (en) * | 2011-01-11 | 2011-06-15 | 杭州电子科技大学 | Current transformer-based light-emitting diode (LED) driving circuit |
| CN102098842B (en) * | 2011-01-11 | 2013-08-14 | 杭州电子科技大学 | Current transformer-based light-emitting diode (LED) driving circuit |
| CN110969868A (en) * | 2019-11-28 | 2020-04-07 | 中冶京诚工程技术有限公司 | Control method, device and system of traffic signal lamp |
| CN110969868B (en) * | 2019-11-28 | 2021-03-02 | 中冶京诚工程技术有限公司 | Control method, device and system of traffic signal lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FLAT PANEL DISPLAY TECHNOLOGY CENTER, NANHAI, FOSH |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518053 KONKA GROUP, OVERSEAS CHINESE TOWN, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE TO: 518053 NO.9008, SHENNAN AVENUE, OVERSEAS CHINESE CITY, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101213 Address after: 518053 Nanshan District, Guangdong overseas Chinese town Shennan Road, No. 9008, No. Co-patentee after: Foshan Nanhai Panel Display Technology Center Patentee after: Konka Group Co., Ltd. Address before: 518053 Nanshan District, Guangdong, Oct Konka Group Patentee before: Konka Group Co., Ltd. |
|
| DD01 | Delivery of document by public notice |
Addressee: Konka Group Co., Ltd. Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Konka Group Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20160512 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |