CN1494362A - Voltage supply circuit of multi fluorescent lamp tubes - Google Patents
Voltage supply circuit of multi fluorescent lamp tubes Download PDFInfo
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- CN1494362A CN1494362A CNA021479585A CN02147958A CN1494362A CN 1494362 A CN1494362 A CN 1494362A CN A021479585 A CNA021479585 A CN A021479585A CN 02147958 A CN02147958 A CN 02147958A CN 1494362 A CN1494362 A CN 1494362A
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- coil
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- voltage supply
- voltage signal
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Abstract
The circuit includes a magnetic core, first, second, and third windings as well as first and second luminous tubes. The first winding is wrapped on the core to receive first voltage signal. The second and third winding also wrapped on the core and positioned at two sides of the first winding respectively. Second and third voltage signals are induced and generated from first winding. First and second luminous tubes are driven by second and third voltage signals.
Description
Technical field
The present invention is particularly to a kind of voltage supply circuit of many fluorescent tubes relevant for a kind of voltage supply circuit of discharge lamp, can equiulbrium flow through each lamp tube current.
Background technology
Many displays are arranged at present, and as LCD, the fluorescent tube that all essential use is high-effect and external form is light and handy is as backlight.Cold-cathode tube (CCFL) just becomes in LCD the fluorescent tube of normal use.Simultaneously, along with the size of display is increasing, backlight not applied of single fluorescent tube used, and must use a plurality of fluorescent tubes just can reach gratifying brightness in back light system.
Fig. 1 has represented the voltage supply circuit of traditional many fluorescent tubes.This circuit has comprised one drive circuit 11, transformer 12, capacitor C 1 and C2, balancing circuitry 13, a fluorescent tube 151 and 152 of being made up of first siding ring 121, second siding ring 122, magnetic core 123.Drive circuit 11 provides first lateral coil 121 of low-voltage signal to transformer 12, produces high-voltage signal in 122 inductions of second lateral coil, and drives fluorescent tube 151 and 152.The electric current of fluorescent tube 151,152 may be because the impedance or the stray capacitance of lead owing to flow through, and it is incomplete same, cause the luminosity difference of two fluorescent tubes 151,152, reduced the picture quality of display, therefore used balancing circuitry 13 to come the electric current of equiulbrium flow through two fluorescent tubes 151 and 152.
Fig. 2 has represented the voltage supply circuit of many fluorescent tubes that another is traditional.For illustrative simplicity, assembly identical with Fig. 1 among Fig. 2 uses identical symbol.The different balancing circuitrys 23 that are of the many light tube electric voltages supply circuit maximum among Fig. 2 and Fig. 1 are connected between place and the fluorescent tube 151,152.
Fig. 3 has represented employed transformer device structure in traditional many light tube electric voltages supply circuit.First siding ring 121 and second siding ring 122 are respectively around the both sides 311,312 of magnetic core 123.
In above-mentioned many light tube electric voltages of tradition supply circuit, because transformer 12 only has two coils respectively as the usefulness of high-pressure side and low-pressure side, when promoting many fluorescent tubes, must use three kinds of modes to carry out: fluorescent tube is connected, fluorescent tube is in parallel and use a plurality of transformers.Yet though the fluorescent tube series connection can overcome the current balance type problem, the transformer problem of withstand voltage is difficult for handling; The fluorescent tube parallel connection need add balancing circuitry; Use a plurality of transformers that cost is improved, and take up room.
Summary of the invention
In order to address the above problem, the invention provides a kind of voltage supply circuit of many fluorescent tubes, can promote many fluorescent tubes and equiulbrium flow through each lamp tube current additionally not using balancing circuitry and increasing under the situation of number transformer.
A purpose of the present invention is to provide a kind of voltage supply circuit of many fluorescent tubes, comprising: a magnetic core; First coil on this magnetic core, receives first voltage signal; Second and third coil on this magnetic core and lay respectively at the both sides of this first coil, has the roughly the same number of turns, and induction produces second and third voltage signal respectively via this first coil; And first and second fluorescent tube, drive by this second and third voltage signal respectively.
Another object of the present invention is to provide a kind of voltage supply circuit of many fluorescent tubes, comprising: a magnetic core; First coil on this magnetic core, has first voltage signal between its two ends; A plurality of second coils on this magnetic core, are positioned at the both sides of this first coil with symmetric mode in twos, have the roughly the same number of turns, and this first voltage signal produces second voltage signal in the induction of the two ends of each second coil; And a plurality of fluorescent tubes, drive by described each second voltage signal.
By this, the present invention on same magnetic core, makes each second siding ring can promote a fluorescent tube a plurality of second siding rings and first siding ring, and only need use a transformer can reach the purpose that promotes many fluorescent tubes.Simultaneously, because all second siding rings use same magnetic core, and the number of turns is identical, and fluorescent tube is connected to its polarity same side.According to Faraday's electromagnetic induction law and Lenz's law, its magnetic flux and flow direction are all identical, so each lamp tube current of flowing through will autobalance, and do not need additionally to use balancing circuitry.
Below, with regard to the embodiment of description of drawings a kind of many light tube electric voltages supply circuit of the present invention.
Description of drawings
Fig. 1 has represented the voltage supply circuit of traditional many fluorescent tubes;
Fig. 2 has represented the voltage supply circuit of another traditional many fluorescent tubes;
Fig. 3 has represented the transformer that uses in many light tube electric voltages of tradition supply circuit;
Fig. 4 has represented the many light tube electric voltages supply circuit in the first embodiment of the invention;
Fig. 5 has represented the many light tube electric voltages supply circuit in the second embodiment of the invention;
Fig. 6 has represented the many light tube electric voltages supply circuit in the third embodiment of the invention;
Fig. 7 has represented the many light tube electric voltages supply circuit in the fourth embodiment of the invention;
Fig. 8 has represented the many light tube electric voltages supply circuit in the fifth embodiment of the invention;
Fig. 9 represents the employed transformer of many light tube electric voltages supply circuit among the present invention first to the 5th embodiment.
Symbol description
11,41: drive circuit;
12,42,56,66,82: transformer;
121,122,421-423,561-564,661-665,821-825: coil;
123,424,565,666: magnetic core;
13,23: balancing circuitry;
151,152,431-434,571,572,671,672: cold-cathode tube;
51,52,61,62: transistor;
53,54: diode
55: electric capacity;
63,64: resistance;
65: inductance.
Embodiment
Fig. 4 has represented the many light tube electric voltages supply circuit in the first embodiment of the invention.Transformer 42, capacitor C 1, C2 and discharge lamp 431,432 that it comprises one drive circuit 41, is made up of first siding ring 421, second siding ring 422,423 and magnetic core 424.First siding ring 421 receives the low-voltage signal from drive circuit 41 on magnetic core 424.Also on magnetic core 424, induction produces high-voltage signal to second siding ring 422 and 423 respectively via first siding ring 421, and this high-voltage signal then drives fluorescent tube 431 and 432 respectively.Wherein, discharge lamp 431 and 432 can be a cold-cathode tube.Each second siding ring 422,423 has first polar end and second polar end (as shown in the figure), and fluorescent tube 431 and 432 is connected in first polar end of second siding ring 422,423, and the number of turns of coil 422,423 is identical.
Fig. 5 has represented the many light tube electric voltages supply circuit in the second embodiment of the invention.Transformer 56 and discharge lamp 571 and 572 that it has comprised transistor 51 and 52, diode 53 and 54, electric capacity 55, C1 and C2, has been made up of first siding ring 561,562, second siding ring 563,564 and magnetic core 565.First siding ring 561 is on magnetic core 565, and an end connects to receive voltage signal Vin.First siding ring 562 is on magnetic core 565, and an end also connects to receive voltage signal Vin.Its drain electrode of transistor 51 is connected to an end of first siding ring 561, and grid connects to receive a square-wave signal.The drain electrode of transistor 52 is connected to an end of primary side 562 coils, and grid connects receiving another square-wave signal, and base earth.Diode 53 and 54 is connected between the source electrode and drain electrode of transistor 51 and 52.Electric capacity 55 is connected in the base stage of transistor 51 and an end of first siding ring 561. Second siding ring 563 and 564 produces high-voltage signal respectively via the induction of first siding ring 561,562 on magnetic core 565, luminous to drive fluorescent tube 571 and 572.Capacitor C 1 and C2 then are connected between fluorescent tube 571 and the second siding ring 563, and between fluorescent tube 572 and the second siding ring 564.Wherein, discharge lamp 571 and 572 can be a cold-cathode tube.Each second siding ring 563,564 has first polar end and second polar end (as shown in the figure), and capacitor C 1 and C2 are connected in first polar end of second siding ring 563,564, and the number of turns of coil 563,564 is identical.
Fig. 6 has represented the many light tube electric voltages supply circuit in the third embodiment of the invention.Transformer 66, capacitor C 1, C2 and discharge lamp 671,672 that it has comprised transistor 61 and 62, resistance 63 and 64, inductance 65, has been made up of first siding ring 661,662,663, second siding ring 664,665 and magnetic core 666.First siding ring 661,662 and 663 is all on magnetic core 666, and an end of first siding ring 661 is connected with an end of first siding ring 662.Inductance 65 1 ends connect to receive voltage signal Vin, and the other end is connected with an end of first siding ring 661.The drain electrode of transistor 61 is connected to an end of first siding ring 661, and source ground, grid then are connected to an end of first siding ring 663.The drain electrode of transistor 62 is connected to an end of first siding ring 662, and source ground, grid are connected to an end of first siding ring 663.Resistance 63 and 64 is connected between the grid and first siding ring 661 1 ends of transistor 62, and between the grid of transistor 61 and first siding ring 661 1 ends.Second siding ring 664 and 665 produces high-voltage signal respectively via the induction of first siding ring 661,662 and 663 on magnetic core 666, to drive fluorescent tube 671 and 672.Capacitor C 1 and C2 are connected between fluorescent tube 671 and the second siding ring 664, and between fluorescent tube 672 and the second siding ring 665.Wherein, discharge lamp 671 and 672 can be a cold-cathode tube.Each second siding ring 664,665 has first polar end and second polar end (as shown in the figure), and capacitor C 1 and C2 are connected in first polar end of second siding ring 664,665, and the number of turns of coil 664,665 is identical.
Fig. 7 has represented the many light tube electric voltages supply circuit in the fourth embodiment of the invention.For illustrative simplicity, assembly identical with Fig. 4 among Fig. 7 uses identical symbol.Different being of the many light tube electric voltages supply circuit maximum among Fig. 7 and Fig. 4, it has increased by a feedback network 71, can make the electric current of discharge lamp 431,432 more stable by the voltage signal that is fed back to drive circuit 41.
Fig. 8 has represented the many light tube electric voltages supply circuit in the fifth embodiment of the invention.For illustrative simplicity, assembly identical among Fig. 8 and Fig. 4 uses identical symbol.Different being of the many light tube electric voltages supply circuit maximum among Fig. 8 and Fig. 4, the quantity of second siding ring increases to 4 (coil 822-825), therefore can promote 4 discharge lamp 431-434.Wherein, each second siding ring has first polar end and second polar end (as shown in the figure), and discharge lamp 431-434 is connected in first polar end of second siding ring, and the number of turns of all second siding rings is identical.
Fig. 9 has represented the employed transformer device structure of many light tube electric voltages supply circuit among above-mentioned first to the 5th embodiment.The coil of all primary sides is around the pars intermedia 912 of magnetic core 424 (565,666), and all second siding rings are then around the both sides 913 and 914 of magnetic core 424 (565,666).Therefore, through planting transformer device structure thus, a plurality of primary sides and second siding ring can be placed same transformer.
In the various embodiments described above of the present invention, have the following advantages:
1. a transformer can promote many tubes, reduces cost;
2. the lamp current autobalance does not need additionally to use balancing circuitry;
3. because of using two groups of second siding rings, and can share output current, increase the stability of transformer.
Comprehensively above-mentioned, the invention provides a kind of voltage supply circuit of many fluorescent tubes, on same magnetic core, make each second siding ring can promote a fluorescent tube a plurality of second siding rings and first siding ring, and only need use a transformer can reach the purpose that promotes many fluorescent tubes.Simultaneously, because all second siding rings use same magnetic core, and the number of turns is identical, and fluorescent tube is connected to its polarity same side.According to Faraday's electromagnetic induction law and Lenz's law, its magnetic flux and flow direction are all identical, so the lamp tube current of flowing through will autobalance.Therefore, can promote many fluorescent tubes and equiulbrium flow through each lamp tube current additionally not using balancing circuitry and increasing under the situation of number transformer.
Though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can change and improvement, so protection scope of the present invention is as the criterion with the claim restricted portion that is proposed.
Claims (22)
1. the voltage supply circuit of fluorescent tube more than a kind comprises:
One magnetic core;
First coil, on this magnetic core, first termination of this first coil is received first voltage signal;
Second and third coil on this magnetic core and lay respectively at the both sides of this first coil, has the roughly the same number of turns, and induction produces second and third voltage signal respectively via this first coil; And
First and second fluorescent tube is driven by this second and third voltage signal respectively.
2. the voltage supply circuit of many fluorescent tubes as claimed in claim 1, wherein this first and second fluorescent tube is a discharge lamp.
3. the voltage supply circuit of many fluorescent tubes as claimed in claim 2, wherein this discharge lamp is a cold-cathode tube.
4. the voltage supply circuit of many fluorescent tubes as claimed in claim 1, wherein said second and third coil has first polar end and second polar end, and this first and second fluorescent tube is connected in first polar end of this second and third coil.
5. the voltage supply circuit of many fluorescent tubes as claimed in claim 1 wherein also comprises:
First and second electric capacity is connected between this first fluorescent tube and second coil, and between this second fluorescent tube and this tertiary coil.
6. the voltage supply circuit of many fluorescent tubes as claimed in claim 1 wherein also comprises first drive circuit, and this first drive circuit provides this first voltage signal.
7. the voltage supply circuit of many fluorescent tubes as claimed in claim 6, wherein also comprise a plurality of the 4th coils and a plurality of the 4th fluorescent tube, these a plurality of the 4th coils have the roughly the same number of turns, and be positioned at the both sides of first coil with symmetric mode in twos, this first coil produces the 4th voltage signal in first polar end induction of each the 4th coil, and described each the 4th fluorescent tube is driven by described each the 4th voltage signal.
8. the voltage supply circuit of many fluorescent tubes as claimed in claim 6 wherein also comprises:
Second drive circuit; And
The 5th coil, on this magnetic core, first end with first end and this first coil electrically connects, and second end is connected to this second drive circuit.
9. the voltage supply circuit of many fluorescent tubes as claimed in claim 8, wherein this second drive circuit comprises:
The first transistor, its drain electrode are connected to second end of this first coil, and grid connects to receive the 5th voltage signal;
Transistor seconds, its drain electrode are connected to this second end of the 5th coil, and grid connects to receive the 6th voltage signal, base earth;
First and second diode is connected between this first and second transistorized source electrode and the drain electrode; And
One electric capacity is connected between first end of the base stage of this first transistor and this first coil.
10. the voltage supply circuit of many fluorescent tubes as claimed in claim 8, wherein this second and third coil lays respectively at the both sides of this first and the 5th coil.
11. the voltage supply circuit of many fluorescent tubes as claimed in claim 8, wherein also comprise a plurality of the 6th coils and a plurality of the 5th fluorescent tube, these a plurality of the 6th coils have the roughly the same number of turns, and be positioned at the both sides of the first and the 5th coil with symmetric mode in twos, this first coil produces the 7th voltage signal in first polar end induction of each the 6th coil, and described each the 5th fluorescent tube is driven by described each the 7th voltage signal.
12. the voltage supply circuit of many fluorescent tubes as claimed in claim 6 wherein also comprises:
The 3rd drive circuit;
The 7th coil, on this magnetic core, first end with first end and this first coil electrically connects, and second end is connected to the 3rd drive circuit; And
The 8th coil on this magnetic core, has first and second end and is connected with the 3rd drive circuit.
13. the voltage supply circuit of many fluorescent tubes as claimed in claim 12, wherein the 3rd drive circuit comprises:
One inductance has first end and connects to receive this first voltage signal, and second end is connected with first end of this first coil;
The first transistor, its drain electrode are connected to second end of this first coil, and source ground, grid are connected to first end of the 8th coil;
Transistor seconds, its drain electrode are connected to second end of the 7th coil, and source ground, grid are connected to second end of the 8th coil;
First and second resistance is connected between first end of the grid of this first transistor and this first coil, and between first end of the grid of this transistor seconds and this first coil.
14. the voltage supply circuit of many fluorescent tubes as claimed in claim 12, wherein this second and third coil lays respectively at the both sides of this first, the 7th and the 8th coil.
15. the voltage supply circuit of many fluorescent tubes as claimed in claim 12, wherein also comprise a plurality of the 9th coils and a plurality of the 6th fluorescent tube, these a plurality of the 9th coils have the roughly the same number of turns, and be positioned at first with symmetric mode in twos, the both sides of the 7th and the 8th coil, this first coil produces the 8th voltage signal in first polar end induction of each the 9th coil, and described each the 6th fluorescent tube is driven by described each the 8th voltage signal.
16. the voltage supply circuit of many fluorescent tubes as claimed in claim 6 wherein also comprises a feedback network, is connected between this first and second fluorescent tube and this first drive circuit.
17. the voltage supply circuit of fluorescent tube more than a kind comprises:
One magnetic core;
First coil on this magnetic core, has first voltage signal between its two ends;
A plurality of second coils on this magnetic core, are positioned at the both sides of this first coil with symmetric mode position in twos, have the roughly the same number of turns, and this first voltage signal produces second voltage signal in the induction of the two ends of each second coil; And
A plurality of fluorescent tubes are driven by described each second voltage signal.
18. the voltage supply circuit of many fluorescent tubes as claimed in claim 17, wherein said each fluorescent tube is a discharge lamp.
19. the voltage supply circuit of many fluorescent tubes as claimed in claim 18, wherein this discharge lamp is a cold-cathode tube.
20. the voltage supply circuit of many fluorescent tubes as claimed in claim 17, wherein each second coil has first and second polar end, and described each fluorescent tube is connected in first polar end of described each second coil.
21. the voltage supply circuit of many fluorescent tubes as claimed in claim 17 wherein also comprises one drive circuit, and this first voltage signal is provided.
22. the voltage supply circuit of many fluorescent tubes as claimed in claim 21 wherein also comprises a feedback network, is connected between described each second fluorescent tube and this drive circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021479585A CN1494362A (en) | 2002-10-30 | 2002-10-30 | Voltage supply circuit of multi fluorescent lamp tubes |
| CNA200810146125XA CN101384124A (en) | 2002-10-30 | 2002-10-31 | Transformer for driving multiple lamp tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021479585A CN1494362A (en) | 2002-10-30 | 2002-10-30 | Voltage supply circuit of multi fluorescent lamp tubes |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810146125XA Division CN101384124A (en) | 2002-10-30 | 2002-10-31 | Transformer for driving multiple lamp tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1494362A true CN1494362A (en) | 2004-05-05 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021479585A Pending CN1494362A (en) | 2002-10-30 | 2002-10-30 | Voltage supply circuit of multi fluorescent lamp tubes |
| CNA200810146125XA Pending CN101384124A (en) | 2002-10-30 | 2002-10-31 | Transformer for driving multiple lamp tubes |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810146125XA Pending CN101384124A (en) | 2002-10-30 | 2002-10-31 | Transformer for driving multiple lamp tubes |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1494362A (en) |
-
2002
- 2002-10-30 CN CNA021479585A patent/CN1494362A/en active Pending
- 2002-10-31 CN CNA200810146125XA patent/CN101384124A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN101384124A (en) | 2009-03-11 |
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| SE01 | Entry into force of request for substantive examination | ||
| CI01 | Correction of invention patent gazette |
Correction item: Application Date Correct: 20021031 False: 20021030 Number: 18 Volume: 20 |
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| CI02 | Correction of invention patent application |
Correction item: Application Date Correct: 20021031 False: 20021030 Number: 18 Page: The title page Volume: 20 |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICATION DATE; FROM: 2002.10.30 TO: 2002.10.31 |
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| C12 | Rejection of a patent application after its publication | ||
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Open date: 20040505 |