CN2909771Y - Balance control circuit of cold-cathode fluorescent lamp - Google Patents
Balance control circuit of cold-cathode fluorescent lamp Download PDFInfo
- Publication number
- CN2909771Y CN2909771Y CN 200520119863 CN200520119863U CN2909771Y CN 2909771 Y CN2909771 Y CN 2909771Y CN 200520119863 CN200520119863 CN 200520119863 CN 200520119863 U CN200520119863 U CN 200520119863U CN 2909771 Y CN2909771 Y CN 2909771Y
- Authority
- CN
- China
- Prior art keywords
- inductance
- cold
- control circuit
- output
- fluorescent lamp
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
A cold cathode fluorescent lamp balance control circuit consists of a transformer, a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor, and a diode. The second input terminal of the transformer is connected with the external circuit; the first output terminal of the transformer is connected to the ground and the second output terminal respectively connected with the first and second capacitors; the second capacitor is connected with the anode of the diode in the third capacitor while the cathode of the diode with the external control circuit; the other end of the first capacitor is respectively connected with the first and the third ends of the first inductor plus the first end of the second inductor; the fourth end of the first inductor is the first output terminal; the second and the third end of the first inductor are respectively connected with the third and first ends of the second inductor; the fourth and the second ends of the second inductor are respectively used as the second and the third output terminals; and the exported current from the first, the second and the third output terminals controls the cold cathode fluorescent lamp.
Description
[technical field]
The utility model is about a kind of cold-cathode fluorescent lamp balance control circuit, particularly about a kind of current precision balance control circuit of cold-cathode fluorescence lamp.
[background technology]
Because LCD (Liquid Crystal Display, LCD) liquid crystal in the panel itself is not had a characteristics of luminescence, for reaching display effect, need to give the LCD panel that one module backlight is provided, its function is to supply brightness area source adequately and uniformly to panel of LCD.And cold-cathode fluorescence lamp (Cold Cathode FluorescentLamps CCFL) is widely used in the module backlight as light source.
Industry increases day by day for the Current Control required precision of adopting cold-cathode fluorescence lamp as light source at present, and the brightness of the high more then cold-cathode fluorescence lamp of Current Control precision is high more, and the uniformity and stability are good more, and the life-span is also long more.
Please refer to Fig. 1, is a kind of cold-cathode fluorescent lamp balance control circuit schematic diagram of prior art.This balance control circuit 10 comprises a transformer T1, resistance R 1, R2, R3, R4, R5 and R6, capacitor C 1, C2, C3 and C4, inductance TC1 and inductance TC2.Two inputs 1,2 of this transformer T1 are connected with external circuit (figure does not show).Output 3 ground connection of this transformer T1.The output 4 of this transformer T1 is connected with capacitor C 2 with capacitor C 1 respectively, and this capacitor C 1 is connected with ground capacity C4 with the ground capacity C3 of parallel connection.These capacitor C 2 other ends are connected with the 4th end of inductance TC1, and the resistance R 1 of series connection is connected with the 3rd end with the 4th end of inductance TC1 respectively with resistance R 2, and the 3rd end of this inductance TC1 is as the first output I
1Be connected with cold-cathode fluorescence lamp (figure does not show).First end of this inductance TC1 is connected with the 4th end of inductance TC2, and the resistance R 3 of series connection is connected with the 3rd end with the 4th end of this inductance TC2 respectively with resistance R 4, and the 3rd end of this inductance TC2 is as the second output I
2Be connected with cold-cathode fluorescence lamp (figure does not show).Second end of this inductance TC2 is connected with the 4th end of inductance TC1, and the resistance R 5 of series connection is connected with first end with second end of this inductance TC2 respectively with resistance R 6, and first end of this inductance TC2 is as the 3rd output I
3Be connected with cold-cathode fluorescence lamp (figure does not show).
In this balance control circuit 10, the control precision of its cold-cathode fluorescent lamp current can only reach ± 0.6mA, and being difficult to reach needs higher lamp tube current balance control precision day by day, and the electronic component that adopts is more, along with the increase of the cold-cathode fluorescence lamp quantity that controls, circuit will be complicated more.
[utility model content]
For the control precision that overcomes cold-cathode fluorescent lamp current in the prior art is not high, and the electronic component that adopts is more, and the defective of circuit complexity is necessary to provide that a kind of Current Control precision is higher, the simple cold-cathode fluorescent lamp balance control circuit of circuit structure.
A kind of cold-cathode fluorescent lamp balance control circuit, it comprises a transformer, first electric capacity, second electric capacity, the 3rd electric capacity, first inductance, second inductance and a diode, two inputs of this transformer are connected with external circuit, first output head grounding of this transformer, second output of this transformer is connected with second electric capacity with first electric capacity respectively, this second electric capacity is connected with the 3rd electric capacity of ground connection and the anode of diode, the negative electrode of this diode is connected with external control circuit, the other end of this first electric capacity respectively with first end of first inductance, the 3rd end of first inductance is connected with first end of second inductance, the 4th end of this first inductance is first output, second end of this first inductance is connected with first end with the 3rd end of second inductance respectively with the 3rd end, the 4th end of this second inductance and second end be respectively as second output and the 3rd output, this first output, second output and the 3rd output output current control cold-cathode fluorescence lamp.
Compared to prior art, above-mentioned cold-cathode fluorescent lamp balance control circuit adopts electric capacity and inductance, so circuit structure is simple.But therefore it can reach high control precision for the resistance parameter difference between the match parameter coupling compensation adjustment fluorescent tube of the cold-cathode fluorescent lamp load of this cold-cathode fluorescent lamp balance control circuit control.
[description of drawings]
Fig. 1 is the cold-cathode fluorescent lamp balance control circuit schematic diagram of prior art.
Fig. 2 is a cold-cathode fluorescent lamp balance control circuit schematic diagram of the present utility model.
[embodiment]
Please refer to Fig. 2, is cold-cathode fluorescent lamp balance control circuit schematic diagram of the present utility model.This balance control circuit 100 comprises transformer T11, first capacitor C 11, second capacitor C 12, the 3rd capacitor C 13, the first inductance TC11, the second inductance TC12 and diode 20.The first input end 1 of this transformer T11, second input 2 are connected with external circuit (figure does not show).First output, 3 ground connection of this transformer T11.Second output 4 of this transformer T11 is connected with second capacitor C 12 with first capacitor C 11 respectively, and the other end of this second capacitor C 12 is connected with the anode of diode 20 with ground capacity C13, and the negative electrode of this diode 20 is connected with external control circuit (figure does not show).The other end of this first capacitor C 11 is connected with first end 1 of the first inductance TC11, the 3rd end 3 of the first inductance TC11 and first end 1 of the second inductance TC12 respectively, and the 4th end 4 of this first inductance TC11 is as the first output I
1Be connected with cold-cathode fluorescence lamp (figure does not show).Second end 2 of this first inductance TC11 is connected with first end 1 with the 3rd end 3 of the second inductance TC12 respectively with the 3rd end 3, and the 4th end 4 of this second inductance TC12 and second end 2 are respectively as the second output I
2With the 3rd output I
3Be connected with cold-cathode fluorescence lamp (figure does not show).External control circuit is by the electric current output of diode 20 these balance control circuits 100 of control.
The utility model first capacitor C 11, second capacitor C 12 and the 3rd capacitor C 13 are conceptization definition, can be changed to the electric capacity combination of two parallel connections or the combination of two electric capacity polyphones in side circuit is used, and can also be a high-voltage capacitance.
The utility model cold-cathode fluorescent lamp balance control circuit adopts electric capacity and inductance to realize that three cold-cathode fluorescence lamp outputs promote and Balance Control, and it is simple in structure and for the coupling of the match parameter of the cold-cathode fluorescent lamp load of this circuit control, can compensate the resistance difference of revising between fluorescent tube, and the control precision of this circuital current can reach ± 0.3mA and by the electric current output of external control circuit through diode 20 these balance control circuits of control according to control.The number of elements that the utility model adopts is few than prior art, thereby reduces production costs.
The utility model also has other improved procedure, for example can connect a resistance between the 3rd end 3 and the 4th end 4 respectively between first end 1 and second end 2 of the first inductance TC11, the second inductance TC12.If break down, adopt this resistance can the accentuator defencive function with the cold-cathode fluorescence lamp of the utility model cold-cathode fluorescent lamp balance control circuit control.
The utility model not only is suitable for three cold-cathode fluorescence lamps, also has other change form, when circuit need be controlled the cold-cathode fluorescence lamp of three fluorescent tube integral multiples, for example control six cold-cathode fluorescence lamps, then on the utility model circuit base, increase by one group of the utility model circuit again and get final product.
Claims (5)
1. cold-cathode fluorescent lamp balance control circuit, it comprises a transformer, first electric capacity, second electric capacity, the 3rd electric capacity, first inductance and second inductance, two inputs of this transformer are connected with external circuit, first output head grounding of this transformer, second output of this transformer is connected with second electric capacity with first electric capacity respectively, the other end of this first electric capacity respectively with first end of first inductance, the 3rd end of first inductance is connected with first end of second inductance, the 4th end of this first inductance is first output, second end of this first inductance is connected with first end with the 3rd end of second inductance respectively with the 3rd end, the 4th end of this second inductance and second end are respectively as second output and the 3rd output, this first output, second output and the 3rd output output current control cold-cathode fluorescence lamp, it is characterized in that: this cold-cathode fluorescent lamp balance control circuit also comprises a diode, this second electric capacity is connected with the 3rd electric capacity of ground connection and the anode of diode, and the negative electrode of this diode is connected with external control circuit.
2. cold-cathode fluorescent lamp balance control circuit as claimed in claim 1 is characterized in that: this first electric capacity is a high-voltage capacitance.
3. cold-cathode fluorescent lamp balance control circuit as claimed in claim 2 is characterized in that: this second electric capacity is a high-voltage capacitance.
4. cold-cathode fluorescent lamp balance control circuit as claimed in claim 1 is characterized in that: between first end and second end of this first inductance, connect a resistance respectively between the 3rd end and the 4th end.
5. cold-cathode fluorescent lamp balance control circuit as claimed in claim 4 is characterized in that: between first end and second end of this second inductance, connect a resistance respectively between the 3rd end and the 4th end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520119863 CN2909771Y (en) | 2005-12-02 | 2005-12-02 | Balance control circuit of cold-cathode fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520119863 CN2909771Y (en) | 2005-12-02 | 2005-12-02 | Balance control circuit of cold-cathode fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2909771Y true CN2909771Y (en) | 2007-06-06 |
Family
ID=38128980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520119863 Expired - Fee Related CN2909771Y (en) | 2005-12-02 | 2005-12-02 | Balance control circuit of cold-cathode fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2909771Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8058813B2 (en) | 2007-11-13 | 2011-11-15 | Samsung Electronics Co., Ltd. | Backlight unit and liquid crystal display device including the same |
-
2005
- 2005-12-02 CN CN 200520119863 patent/CN2909771Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8058813B2 (en) | 2007-11-13 | 2011-11-15 | Samsung Electronics Co., Ltd. | Backlight unit and liquid crystal display device including the same |
| CN101435950B (en) * | 2007-11-13 | 2012-08-29 | 三星电子株式会社 | Backlight unit and liquid crystal display device including the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7274178B2 (en) | Multi-lamp driver with active current regulator | |
| CN1905774A (en) | Discharge lamp lighting apparatus | |
| GB2535932A (en) | Flyback boosted circuit, LED backlight drive circuit and liquid crystal display | |
| CN114420057A (en) | Backlight power supply, display device and electronic equipment | |
| CN102354483A (en) | LED (Light Emitting Diode) backlight-source boosting driving circuit, LED backlight source and liquid crystal display device | |
| CN2909771Y (en) | Balance control circuit of cold-cathode fluorescent lamp | |
| CN101052260B (en) | Discharge tube drive circuit | |
| CN201718092U (en) | Lamp lighting device utilizing uniform alternating current to drive light-emitting diodes | |
| US7586269B2 (en) | Device for driving light source module | |
| CN1899000A (en) | Method and apparatus for controlling visual enhancement of lighting devices | |
| CN1149006C (en) | Multi-load power supply system and multi-tube drive system | |
| CN100443963C (en) | Cold-cathode fluorescent lamp balance control circuit | |
| CN200983711Y (en) | Driving device of discharge lamp and electronic device using same | |
| CN101031176A (en) | Light-source driver | |
| CN101257262B (en) | Inverter circuit and LCD device | |
| CN201267045Y (en) | Backlight module | |
| CN2795894Y (en) | Driving circuit for cold cathode fluorescent lamp | |
| CN102271438A (en) | Lighting device using even alternating current (AC) for driving light-emitting diodes (LEDs) | |
| CN201138887Y (en) | Driving apparatus of multiple strip lamp | |
| CN2606905Y (en) | Back light plate lamp tube connection structure of improved liquid crystal display screen | |
| CN202948706U (en) | Backlight driving circuit board | |
| CN1402600A (en) | Multiple lamp tube driving system | |
| CN201388328Y (en) | Transformer drive circuit and liquid crystal display device thereof | |
| CN201100563Y (en) | Lamp tube module | |
| CN101256740B (en) | Backlight electric power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070606 Termination date: 20141202 |
|
| EXPY | Termination of patent right or utility model |