CN1716469A - Multiple lamp tube driving device - Google Patents
Multiple lamp tube driving device Download PDFInfo
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- CN1716469A CN1716469A CN 200410062327 CN200410062327A CN1716469A CN 1716469 A CN1716469 A CN 1716469A CN 200410062327 CN200410062327 CN 200410062327 CN 200410062327 A CN200410062327 A CN 200410062327A CN 1716469 A CN1716469 A CN 1716469A
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- cathode fluorescent
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Abstract
The multiple lamp tube driver has transformer with primary coil wound alternately onto several magnetic core middle columns and connected with one exciting power source to obtain required exciting power. When the primary coil excites, the primary coil current applies equal and alternate magnetic motive forces on the magnetic core middle columns to produce magnetic fluxes, and the magnetic fluxes induce equivalent work voltages in the coils of the secondary side via the magnetic core of the transformer, and the work voltages provide the cold cathode fluorescent lamp tubes with equal currents via the ballast element.
Description
Technical field
The invention relates to a kind of multi-light tube driving device, employed transformer when particularly driving, and the multi-light tube driving device that uses this kind transformer about a kind of at least one cathode fluorescent tube (CCFL).
Background technology
Cathode fluorescent tube (CCFL, Cold Cathode Fluorescent Lamp) is known to be to use in display panels (LCD Panel) light source as backlight module (Backlight System).These cathode fluorescent tubes are driven by a drive circuit that is called converter (Inverter).Because technological progress and consumer demand, the LCD panel size constantly increases, and makes single fluorescent tube can't satisfy its illumination, thereby needs to use two or more a plurality of fluorescent tube.
Because the brightness ratio (brightness) of fluorescent tube is with the operating current that flows through fluorescent tube confidential relation to be arranged, operating current is big, and then the brightness of fluorescent tube is then big, otherwise operating current is little, and the brightness of fluorescent tube is that relative meeting reduces.And, in the application of many fluorescent tubes, flow through the operating current of those fluorescent tubes, be can because each fluorescent tube dispatch from the factory the time different characteristic with and ageing process in parameter drift, and deviation to some extent.If therefore the operating current of fluorescent tube is inequality, then the brightness of fluorescent tube then can differ, and so is in the time of can causing the user to watch the LCD panel, produces the different image of light and shade, and then influences the video signal quality.
Please refer to Fig. 1, is the drive circuit block schematic diagram of controlling many fluorescent tubes respectively for known.Wherein drive circuit is to use at least two controllers 2, is connected at least two cathode fluorescent tubes 1 and at least two transformer T.Those controllers 2, it is an operating current of obtaining those cathode fluorescent tubes 1 respectively, via after the calculation process indivedual output voltages being regulated, seeing through transformer T reaches via a capacitor C, be sent to those cathode fluorescent tubes 1 respectively, be scheduled to the average electric current in one with the operating current of stablizing those cathode fluorescent tubes 1.Only this method of adjusting operating current needs extra circuit to reach the Balance Control of operating current.
Please refer to Fig. 2, is the multiple lamp tube drive circuit block schematic diagram for the powerful ballast element of known use.Wherein multiple lamp tube drive circuit is to use a controller 2 to be connected at least two cathode fluorescent tubes 1 and a transformer T.This controller 2, it is total work electric current of obtaining those cathode fluorescent tubes 1, and via after the calculation process, to regulate its output voltage, and see through transformer T, the voltage that regulates is promoted, via ballast element B, put on those cathode fluorescent tubes 1 respectively, to stablize the total current of those cathode fluorescent tubes 1.Those ballast elements B is for equating and high electric capacity or the inductance unit of impedance; High because of impedance, so can major flow cross the operating current size of fluorescent tube, because of equate, so can make the operating current unanimity balance of those fluorescent tubes.Only these high impedance ballast elements can consume great output voltage, and transformer T also thereby will provide high output voltage to cause required lamp works electric current to reach.
Please refer to Fig. 3, is the multiple lamp tube drive circuit block schematic diagram for the differential ballast element of known use.Wherein multiple lamp tube drive circuit is to use a controller 2 to be connected at least two cathode fluorescent tubes 1 and a transformer T.This controller 2, obtain total work electric current of those cathode fluorescent tubes 1, and via after the calculation process, output one voltage that regulates, and see through transformer T the voltage lifting that regulates, via a differential ballast element DB, input current is assigned to those cathode fluorescent tubes 1, again to stablize the total current of those cathode fluorescent tubes 1.Differential ballast element DB, those lamp tube current of can mean allocation flowing through when lamp current has deviation, can induce powerful correction voltage, thereby force the balance of lamp current.Only this differential ballast component size is quite huge.
Summary of the invention
Main purpose of the present invention, employed transformer when providing at least one cathode fluorescent tube (CCFL) driving, and the multi-light tube driving device of this kind of use transformer are in order to reach the Balance Control of those cathode fluorescent tubes (CCFL) operating current.
In order to achieve the above object, multi-light tube driving device of the present invention is to utilize a transformer to be connected between an excitation power supply and those cathode fluorescent tubes (CCFL).Wherein optionally insert the ballast element on fluorescent tube online.
In the above-mentioned explanation, this transformer is to include: a magnetic core, it has one first lateral column and one second lateral column, between this first lateral column and this second lateral column, is to be provided with at least two center pillars.And on an end of those center pillars, be alternately to be connected in series one lateral coils of reeling in regular turn and oppositely, its coil two ends of this first siding ring are to be connected in this excitation power supply, in order to obtain excitatory required electric power.On the other end of those center pillars, be the second siding ring of reeling respectively simultaneously, an end of those second siding rings is ends that are connected to those cathode fluorescent tubes (CCFL), and is connected in a reference edge jointly.The other end of those second siding rings is to see through the other end that a ballast element is connected in those cathode fluorescent tubes (CCFL) respectively.
When transformer excitation, because this first siding ring, be alternately to be connected in series in regular turn and oppositely to be wound on those center pillars, therefore on those adjacent center pillars, can accept the opposite magnetomotive force of equal and opposite in direction and direction and produce corresponding magnetic flux, those magnetic fluxs are to flow to this first lateral column of transformer, adjacent center pillar or this second lateral column, flow back to those center pillars again, to form magnetic flux mouth road.Because the magnetomotive force size of those center pillars is identical, therefore be wound in the second siding ring of those center pillar other ends, be to respond to suitable secondary voltage, and respectively through the ballast element, produce the output current of average, provide the work of those cathode fluorescent tubes (CCFL) required, reach the purpose of operating current balance.
Description of drawings
Fig. 1 is the known drive circuit block schematic diagram of controlling many fluorescent tubes respectively;
Fig. 2 is the multiple lamp tube drive circuit block schematic diagram of the powerful ballast element of known use;
Fig. 3 is the multiple lamp tube drive circuit block schematic diagram of the differential ballast element of known use;
Fig. 4 is a multiple lamp tube drive circuit schematic diagram of the present invention;
Fig. 5 is transformer coiling of the present invention and circuit box schematic diagram;
Fig. 6 is the transformer coiling and the circuit box schematic diagram of another embodiment of the present invention;
Fig. 7 is more transformer coiling and the circuit box schematic diagram of an embodiment of the present invention.
Symbol description:
1～cathode fluorescent tube
2～controller
T～transformer
C～capacitor
B～ballast element
DB～differential ballast element
G, h～cathode fluorescent tube
P, q～capacitor
T1, T2～transformer
V～excitation power supply
1～multi-light tube driving device
Tr, Trl～transformer
10～magnetic core
11～first siding ring
12～the first lateral columns 12
14～the second lateral columns
13～second siding ring
16～center pillar
G～reference edge
P, q～ballast element
2～multi-light tube driving device
20～sealing magnetic core
22～first siding ring
24～second siding ring
Embodiment
In order to make your juror can further understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet appended graphic only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Please refer to Fig. 4, is to be multiple lamp tube drive circuit schematic diagram of the present invention.Wherein be to be that example explains to drive two fluorescent tubes.This cathode fluorescent tube (g, n) is to see through capacitor (p, q) respectively to be connected to transformer T1, T2, and the first siding ring of transformer T1, T2 is alternately to be connected in series in regular turn and oppositely, and the first siding ring two ends are to be connected in an excitation power supply V simultaneously.Moreover its first siding ring number of turn of transformer T1, T2 needs identical, and simultaneously, the second siding ring number of turn also needs identical.So, when its first siding ring of transformer T1, T2 is excitatory, the size of current that flows through transformer T1, T2 first siding ring is identical, thereby induces suitable voltage respectively at the two ends of second siding ring, and the operating current that also can produce identical size is given those cathode fluorescent tubes (g, h).
Please refer to Fig. 5, is transformer coiling and circuit box schematic diagram for Fig. 4.Wherein be to be that example explains to drive two fluorescent tubes.Multi-light tube driving device 1 of the present invention, be to utilize a transformer Tr to be connected in an end of an excitation power supply V and those cathode fluorescent tubes (g, h), this transformer Tr more sees through at least one ballast element (p, q) simultaneously, is connected respectively to the other end of those cathode fluorescent tubes (g, h).
In the above-mentioned explanation, this transformer Tr includes: a magnetic core 10, it has one first lateral column 12 and one second lateral column 14,14 of this first lateral column 12 and this second lateral columns, is to be provided with two center pillars 16.And on an end of those center pillars 16, be alternately to be connected in series one lateral coils 11 of reeling in regular turn and oppositely, these first siding ring 11 its coil two ends are to be connected in this excitation power supply V, in order to obtain excitatory required electric power.On the other end of those center pillars 16, be the second siding ring 13 of reeling respectively simultaneously, an end of those second siding rings 13 is ends that are connected to those cathode fluorescent tubes (g, h), and is connected in a reference edge G jointly.The other end of those second siding rings 13 is to see through the other end that ballast element (p, q) is connected in those cathode fluorescent tubes (g, h) respectively.
When transformer Tr is excitatory, because this first siding ring 11 is alternately to be connected in series in regular turn and oppositely to be wound on those center pillars 16, therefore on those adjacent center pillars 16, can accept the opposite magnetomotive force of equal and opposite in direction and direction, and produce corresponding magnetic flux, those magnetic fluxs are this first lateral column 12 that can flow to transformer Tr, adjacent other center pillar or this second lateral column 14, flow back to those center pillars 16 again, to form flux circuit.Because therefore the magnetomotive force equal and opposite in direction on those center pillars 16 is wound in the second siding ring 13 of those center pillar 16 other ends, be to respond to suitable secondary voltage, and see through ballast element (p, q) respectively, the operating current of those cathode fluorescent tubes (g, h) average is provided.In addition, because these adjacent intrastelar magnetic fluxs sizes are similar and direction is opposite, the adjacent center pillar so can choose the road through basically in magnetic flux mouth road has only a small amount of deviation magnetic flux lateral column of can choosing the road through.Therefore, no matter the quantity of center pillar what, the quantity of lateral column and sectional area all need not increase.
In the above-mentioned explanation, wherein those ballast elements (p, q) are to be capacitor, when itself and those cathode fluorescent tube (g, h) moves, have higher relatively impedance.Simultaneously, this first siding ring 11 is wound on those center pillars 16, and its coil turn is for equating.And those second siding rings 13 are wound in respectively on those center pillars 16, and its coil turn is for equating.Moreover, the present invention more can have an electric current acquisition unit (not indicating), being the arbitrary end that is connected in those cathode fluorescent tubes (g, h), is not to be made up of at least one resistor (indicating), is used for obtaining the operating current that flows through those cathode fluorescent tubes (g, h).
Please refer to Fig. 6, is transformer coiling and circuit box schematic diagram for another embodiment of the present invention.Wherein be to be that example explains to drive two fluorescent tubes.Another multi-light tube driving device 2 of the present invention is to have at least one sealing magnetic core 20, and those seal magnetic core 20, is each self-forming one magnetic flux closed path.On those sealing magnetic cores 20 is the lateral coil 22 of reeling respectively one one times, and those first siding rings 22 are to be connected in series in regular turn, and, be connected in this excitation power supply V simultaneously, to obtain the required excitatory electric power of work.Moreover the second siding ring 24 of reeling more respectively on those sealing magnetic cores 20, and an end of those second siding rings 24 are ends that are connected to those cathode fluorescent tubes (g, h), and are connected in a reference edge G jointly.The other end of those second siding rings 24 is to see through those ballast elements (p, q) respectively, is connected to the other end of those cathode fluorescent tubes (g, h).
When those first siding rings 22 are excitatory, because those first siding rings 22 are to be connected in series in regular turn to be wound on those sealing magnetic cores 20 so in those seal magnetic cores 20, can accept equal-sized magnetomotive force, and producing corresponding magnetic flux, those magnetic fluxs are to seal each self-forming one flux circuit on magnetic cores 20 at those.Because the magnetomotive force size on those sealing magnetic cores 20 is identical, therefore, be wound in those second siding rings 24 of those sealing magnetic cores 20 simultaneously, be to respond to the quite secondary voltage of size, and see through ballast element (p, q) respectively, the operating current of those cathode fluorescent tubes (g, h) average is provided.
In the above-mentioned explanation, wherein those ballast elements (p, q) are to be capacitor, when itself and those cathode fluorescent tube (g, h) moves, have higher relatively impedance.Simultaneously, those first siding rings 22, its coil turn are for equating.And those second siding rings 24, its coil turn are for equating.Moreover, the present invention more can have an electric current acquisition unit (not indicating), being the arbitrary end that is connected in those cathode fluorescent tubes (g, h), is not to be made up of at least one resistor (indicating), is used for obtaining the operating current that flows through those cathode fluorescent tubes (g, h).
Cooperate Fig. 5, please refer to Fig. 7, be the present invention more transformer coiling and the circuit box schematic diagram of an embodiment.Wherein the present invention is to be example to drive three fluorescent tubes, the present invention is at this employed transformer Tr1 and transformer Tr shown in Figure 5, its difference does not exist together, it is the number that is its center pillar 16, because transformer Tr is to drive two fluorescent tubes, therefore its employed center pillar 16 is two, and transformer Tr1 is used for driving three fluorescent tubes, so its employed center pillar 16 is three.
Moreover the first siding ring 11 of being reeled on transformer Tr1 center pillar 16 1 ends is, in regular turn and oppositely alternately serial connection is wound on those center pillars 16, and these first siding ring 11 its coil two ends are to be connected in this excitation power supply V, in order to obtain excitatory required electric power.On the other end of those center pillars 16, be the second siding ring 13 of reeling respectively simultaneously, an end of those second siding rings 13 is ends that are connected to those cathode fluorescent tubes (g, h, i), and is connected in a reference edge G jointly.The other end of those second siding rings 13 is to see through the other end that ballast element (p, q, r) is connected in those cathode fluorescent tubes (g, h, i) respectively.
As described above, the present invention drives three fluorescent tubes, when transformer Tr1 is excitatory, because this first siding ring 11 is to replace serial connection in regular turn and oppositely and be wound on those center pillars 16, therefore on those adjacent center pillars 16, can accept the magnetomotive force that size is identical and direction is opposite simultaneously, and produce corresponding magnetic flux, those magnetic fluxs are first lateral column 12 that can flow to transformer Tr1, adjacent other center pillar or this second lateral column 14, flow back to those center pillars 16 again, to form flux circuit.Because the magnetomotive force size on those center pillars 16 is identical, be wound in the second siding ring 13 of those center pillar 16 other ends, be to respond to suitable secondary voltage, and see through ballast element (p, q, r) respectively, the operating current of those cathode fluorescent tubes (g, h, i) average is provided.In addition, because these adjacent intrastelar magnetic flux sizes are informed you and direction is opposite, the adjacent center pillar so flux circuit can choose the road through basically has only a small amount of deviation magnetic flux lateral column of can choosing the road through.Therefore, no matter the quantity of center pillar what, the quantity of lateral column and sectional area all need not increase.
In sum, be to utilize transformer alternately to be connected in series the first siding ring of reeling in regular turn and oppositely to be connected in this excitation power supply, and obtain excitatory required electric power.When coil excitation, on first siding ring the electric current of the identical size of circulation, apply equal-sized magnetomotive force, and produce corresponding magnetic flux.This magnetic flux also induces simultaneously suitable operating voltage on second siding ring, see through the ballast element respectively, so that the cathode fluorescent tube operating current of average to be provided.In addition, because the adjacent intrastelar magnetic flux of these transformers size is similar and direction is opposite, the adjacent center pillar so flux circuit can choose the road through basically has only a small amount of deviation magnetic flux lateral column of can choosing the road through.Therefore, the quantity of how many lateral columns of quantity of center pillar and sectional area all need not increase.
Claims (10)
1. a multi-light tube driving device is to be connected in an excitation power supply, is used for driving the action of at least two cathode fluorescent tubes, it is characterized in that described multi-light tube driving device includes:
One transformer is to include:
One magnetic core, it has at least one lateral column, and adjacent with this lateral column is to be provided with at least two center pillars;
One lateral coils, its coil two ends are connected in this excitation power supply, are alternately to be connected in series in regular turn and oppositely to be wound on this center pillar;
At least two second siding rings are to be wound in respectively on this center pillar, and an end of this each second siding ring, are ends that is connected in a cathode fluorescent tube; The other end of this second siding ring is the other end that is connected in this cathode fluorescent tube.
2. multi-light tube driving device according to claim 1 is characterized in that: at least one ballast element is more arranged, and is the arbitrary end that is connected in this cathode fluorescent tube.
3. multi-light tube driving device according to claim 1 is characterized in that: an electric current acquisition unit is more arranged, and is the arbitrary end that is connected in this cathode fluorescent tube.
4. multi-light tube driving device according to claim 1 is characterized in that: this first siding ring segmentation is wound on this center pillar, and every section number of turn of its coil is for equating.
5. multi-light tube driving device according to claim 1 is characterized in that: this second siding ring is wound in respectively on this center pillar, and its coil turn is for equating.
6. the transformer of a multi-light tube driving device is characterized in that the transformer of described multi-light tube driving device includes:
One magnetic core, it has at least one lateral column, and adjacent with this lateral column is to be provided with at least two center pillars;
One lateral coils are alternately to be connected in series in regular turn and oppositely to be wound on this center pillar; And
At least two second siding rings are to be wound in respectively on this center pillar.
7. a multi-light tube driving device is to be connected in an excitation power supply, is used for driving the action of at least two cathode fluorescent tubes, it is characterized in that described multi-light tube driving device includes:
At least two sealing magnetic cores, this seals magnetic core, is each self-forming one magnetic flux closed path;
At least two first siding rings are wound in respectively on this sealing magnetic core, are to be connected in series in regular turn, and are connected in this excitation power supply;
At least two second siding rings are to be wound in respectively on this sealing magnetic core, and an end of this each second siding ring, are ends that is connected in a cathode fluorescent tube; The other end of this second siding ring is the other end that is connected in this cathode fluorescent tube.
8. multi-light tube driving device according to claim 7 is characterized in that: at least one ballast element is more arranged, and is the arbitrary end that is connected in this cathode fluorescent tube.
9. multi-light tube driving device according to claim 7 is characterized in that: an electric current acquisition unit is more arranged, and is the arbitrary end that is connected in this cathode fluorescent tube.
10. multi-light tube driving device according to claim 7 is characterized in that: primary side and second siding ring on this sealing magnetic core, its coil turn ratio are for equating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062327 CN1716469A (en) | 2004-07-01 | 2004-07-01 | Multiple lamp tube driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062327 CN1716469A (en) | 2004-07-01 | 2004-07-01 | Multiple lamp tube driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1716469A true CN1716469A (en) | 2006-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410062327 Pending CN1716469A (en) | 2004-07-01 | 2004-07-01 | Multiple lamp tube driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1716469A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155457B (en) * | 2006-09-29 | 2011-06-08 | 鸿富锦精密工业（深圳）有限公司 | Light source driving mechanism with jump-spark protection function |
-
2004
- 2004-07-01 CN CN 200410062327 patent/CN1716469A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155457B (en) * | 2006-09-29 | 2011-06-08 | 鸿富锦精密工业（深圳）有限公司 | Light source driving mechanism with jump-spark protection function |
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