CN100443963C - Cold-cathode fluorescent lamp balance control circuit - Google Patents
Cold-cathode fluorescent lamp balance control circuit Download PDFInfo
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- CN100443963C CN100443963C CNB2005101007865A CN200510100786A CN100443963C CN 100443963 C CN100443963 C CN 100443963C CN B2005101007865 A CNB2005101007865 A CN B2005101007865A CN 200510100786 A CN200510100786 A CN 200510100786A CN 100443963 C CN100443963 C CN 100443963C
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Abstract
A balance control circuit of cold cathode fluorescent lamp consists of two input ends of transducer to external circuit and the first output end to ground as well as the second output end separately to the first capacity and the second capacity being grounded, connecting another end of the first capacity to the first and the third ends of the first inductance (TFI) as well as to the first end of the second inductance (TSI), connecting the second and third ends of TFI separately to the third and the first ends of TFI, using the first output end of TFI and the fourth as well as the second ends of TSI as the first and the second as well as the third outputs for outputting current to control said lamp.
Description
[technical field]
The invention relates to 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 accuracy requirement 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 uniformity coefficient and degree of 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 synoptic 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 input ends 1,2 of this transformer T1 link to each other with external circuit (figure does not show).Output terminal 3 ground connection of this transformer T1.The output terminal 4 of this transformer T1 links to each other with capacitor C 2 with capacitor C 1 respectively, and this capacitor C 1 links to each other with direct earth capacitance C4 with the direct earth capacitance C3 of parallel connection.These capacitor C 2 other ends link to each other with the 4th end of inductance TC1, and the resistance R 1 of series connection links to each other 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 terminal I
1Link to each other with cold-cathode fluorescence lamp (figure does not show).First end of this inductance TC1 links to each other with the 4th end of inductance TC2, and the resistance R 3 of series connection links to each other 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 terminal I
2Link to each other with cold-cathode fluorescence lamp (figure does not show).Second end of this inductance TC2 links to each other with the 4th end of inductance TC1, and the resistance R 5 of series connection links to each other 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 terminal I
3Link to each other with cold-cathode fluorescence lamp (figure does not show).
In this balance control circuit 10, the control accuracy of its cold-cathode fluorescent lamp current can only reach ± 0.6mA, and being difficult to reach needs higher lamp tube current balance control accuracy day by day, and the electronic component that adopts is more, the circuit complexity.
[summary of the invention]
For the control accuracy 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, first inductance and second inductance, two input ends of this transformer link to each other with external circuit, first output head grounding of this transformer, second output terminal of this transformer links to each other with second electric capacity of first electric capacity and ground connection respectively, the other end of this first electric capacity respectively with first end of first inductance, the 3rd end of first inductance links to each other with first end of second inductance, the 4th end of this first inductance is first output terminal, second end of this first inductance links to each other with the 3rd end of second inductance, the 3rd end of this first inductance links to each other with first end of this second inductance, the 4th end of this second inductance and second end be respectively as second output terminal and the 3rd output terminal, this first output terminal, second output terminal and the 3rd output terminal output current control cold-cathode fluorescence lamp.
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 and second inductance, two input ends of this transformer link to each other with external circuit, first output head grounding of this transformer, second output terminal of this transformer link to each other with second electric capacity of first electric capacity and ground connection respectively; The other end of this first electric capacity links to each other with first end of first inductance, and an end of the 3rd electric capacity links to each other with second output terminal of this transformer, and the other end links to each other with the 3rd end of first inductance and first end of second inductance respectively; The 4th end of this first inductance is first output terminal, second end of this first inductance links to each other with the 3rd end of second inductance, the 3rd end of this first inductance links to each other with first end of this second inductance, and the 4th end of this second inductance and second end are respectively as second output terminal and the 3rd output terminal; This first output terminal, second output terminal and the 3rd output terminal 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 matching parameter coupling compensation adjustment fluorescent tube of the cold-cathode fluorescent lamp load of this circuit control.
[description of drawings]
Fig. 1 is a prior art cold-cathode fluorescent lamp balance control circuit synoptic diagram.
Fig. 2 is the first embodiment synoptic diagram of cold-cathode fluorescent lamp balance control circuit of the present invention.
Fig. 3 is the second embodiment synoptic diagram of cold-cathode fluorescent lamp balance control circuit of the present invention.
[embodiment]
Please refer to Fig. 2, is the first embodiment synoptic diagram of cold-cathode fluorescent lamp balance control circuit of the present invention.This balance control circuit 100 comprises transformer T11, capacitor C 11, capacitor C 12, inductance TC11 and inductance TC12.Two input ends 1,2 of this transformer T11 link to each other with external circuit (figure does not show).Output terminal 3 ground connection of this transformer T11.The output terminal 4 of this transformer T11 links to each other with direct earth capacitance C12 with capacitor C 11 respectively, the other end of this capacitor C 11 links to each other with first end of inductance TC11, the 3rd end of inductance TC11 and first end of inductance TC12 respectively, and the 4th end of this inductance TC11 is as the first output terminal I
1Link to each other with cold-cathode fluorescence lamp (figure does not show).Second end of this inductance TC11 links to each other with first end with the 3rd end of inductance TC12 respectively with the 3rd end, and the 4th end of this inductance TC12 and second end are respectively as the second output terminal I
2With the 3rd output terminal I
3Link to each other with cold-cathode fluorescence lamp (figure does not show).
Please refer to Fig. 3, is the second embodiment synoptic diagram of cold-cathode fluorescent lamp balance control circuit of the present invention.This balance control circuit 200 comprises transformer T21, capacitor C 21, capacitor C 22, capacitor C 23, inductance TC21 and inductance TC22.Two input ends 1,2 of this transformer T21 link to each other with external circuit (figure does not show).Output terminal 3 ground connection of this transformer T21.The output terminal 4 of this transformer T21 links to each other with capacitor C 21, capacitor C 23 and direct earth capacitance C22 respectively.The other end of this capacitor C 23 links to each other with the 3rd end of TC21 and first end of inductance TC22; The other end of this capacitor C 21 links to each other with first end of inductance TC21.The 4th end of this inductance TC21 is as the first output terminal I
1Link to each other with cold-cathode fluorescence lamp (figure does not show).Second end of this inductance TC21 links to each other with first end with the 3rd end of inductance TC22 respectively with the 3rd end, and the 4th end of this inductance TC22 and second end are respectively as the second output terminal I
2With the 3rd output terminal I
3Link to each other with cold-cathode fluorescence lamp (figure does not show).
Capacitor C 11 of the present invention, capacitor C 12, capacitor C 21, capacitor C 22 and capacitor C 23 are generalities 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.
Cold-cathode fluorescent lamp balance control circuit of the present invention adopts electric capacity and inductance, so it is simple in structure, and it can compensate the resistance difference of revising between fluorescent tube for the coupling of the matching parameter of the cold-cathode fluorescent lamp load of this circuit control.Capacitor C 23 can be adjusted and the compensating circuit non-equilibrium structure, can realize the flexible of three cold-cathode fluorescence lamp outputs.The ratio of adjusting the appearance value of capacitor C 21 and capacitor C 23 can change three output terminal I of this circuit
1, I
2And I
3The ratio of output current, thus can realize higher precision adjusting, and the control accuracy of this circuital current can reach ± 0.3mA.The number of elements that the present invention adopts is few than prior art, thereby reduces production costs.
The first embodiment of the invention and second embodiment also have other improved procedure, for example can connect a resistance between the 3rd end and the 4th end respectively between first end and second end of inductance TC11, inductance TC12, inductance TC21 and inductance TC22.If break down, adopt this resistance can the accentuator defencive function with the cold-cathode fluorescence lamp of cold-cathode fluorescent lamp balance control circuit of the present invention control.
The present invention 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 circuit base of the present invention, increase by one group of circuit of the present invention again and get final product.
Claims (10)
1. cold-cathode fluorescent lamp balance control circuit, it comprises a transformer, first electric capacity, second electric capacity, first inductance and second inductance, two input ends of this transformer link to each other with external circuit, first output head grounding of this transformer, second output terminal of this transformer links to each other with second electric capacity of first electric capacity and ground connection respectively, the other end of this first electric capacity respectively with first end of first inductance, the 3rd end of first inductance links to each other with first end of second inductance, the 4th end of this first inductance is first output terminal, second end of this first inductance links to each other with the 3rd end of second inductance, the 3rd end of this first inductance links to each other with first end of this second inductance, the 4th end of this second inductance and second end be respectively as second output terminal and the 3rd output terminal, this first output terminal, second output terminal and the 3rd output terminal output current control cold-cathode fluorescence lamp.
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.
6. 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 input ends of this transformer link to each other with external circuit, first output head grounding wherein of this transformer, second output terminal of this transformer link to each other with second electric capacity of first electric capacity and ground connection respectively; The other end of this first electric capacity links to each other with first end of first inductance, and an end of the 3rd electric capacity links to each other with second output terminal of this transformer, and the other end links to each other with the 3rd end of first inductance and first end of second inductance respectively; The 4th end of this first inductance is first output terminal, second end of this first inductance links to each other with the 3rd end of second inductance, the 3rd end of this first inductance links to each other with first end of this second inductance, and the 4th end of this second inductance and second end are respectively as second output terminal and the 3rd output terminal; This first output terminal, second output terminal and the 3rd output terminal output current control cold-cathode fluorescence lamp.
7. cold-cathode fluorescent lamp balance control circuit as claimed in claim 6 is characterized in that: this first electric capacity is a high-voltage capacitance.
8. cold-cathode fluorescent lamp balance control circuit as claimed in claim 7 is characterized in that: this second electric capacity is a high-voltage capacitance.
9. cold-cathode fluorescent lamp balance control circuit as claimed in claim 8 is characterized in that: the 3rd electric capacity is a high-voltage capacitance.
10. cold-cathode fluorescent lamp balance control circuit as claimed in claim 9 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 |
|---|---|---|---|
| CNB2005101007865A CN100443963C (en) | 2005-10-26 | 2005-10-26 | Cold-cathode fluorescent lamp balance control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101007865A CN100443963C (en) | 2005-10-26 | 2005-10-26 | Cold-cathode fluorescent lamp balance control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1955789A CN1955789A (en) | 2007-05-02 |
| CN100443963C true CN100443963C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101007865A Expired - Fee Related CN100443963C (en) | 2005-10-26 | 2005-10-26 | Cold-cathode fluorescent lamp balance control circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371237A (en) * | 2001-02-27 | 2002-09-25 | 国碁电子股份有限公司 | Multi-lamp drive system |
| US6534934B1 (en) * | 2001-03-07 | 2003-03-18 | Ambit Microsystems Corp. | Multi-lamp driving system |
-
2005
- 2005-10-26 CN CNB2005101007865A patent/CN100443963C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371237A (en) * | 2001-02-27 | 2002-09-25 | 国碁电子股份有限公司 | Multi-lamp drive system |
| US6534934B1 (en) * | 2001-03-07 | 2003-03-18 | Ambit Microsystems Corp. | Multi-lamp driving system |
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| Publication number | Publication date |
|---|---|
| CN1955789A (en) | 2007-05-02 |
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Granted publication date: 20081217 Termination date: 20171026 |