CN101384124A - Transformer for driving multiple lamp tubes - Google Patents
Transformer for driving multiple lamp tubes Download PDFInfo
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- CN101384124A CN101384124A CNA200810146125XA CN200810146125A CN101384124A CN 101384124 A CN101384124 A CN 101384124A CN A200810146125X A CNA200810146125X A CN A200810146125XA CN 200810146125 A CN200810146125 A CN 200810146125A CN 101384124 A CN101384124 A CN 101384124A
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- siding ring
- magnetic core
- transformer
- supply circuit
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Abstract
The invention provides a transformer used for driving multiple lighting tubes, comprising a magnetic core, a primary-side coil winded round the middle of the magnetic core, a first secondary-side coil and a second secondary-side coil which are winded round the magnetic core and respectively positioned at two sides of the primary-side coil and have the same number of windings.
Description
The application be that October 31, application number in 2002 are 02147958.5 the applying date, denomination of invention divides an application for the application for a patent for invention of " voltage supply circuits of many fluorescent tubes ".
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.
Another object of the present invention is to provide a kind of transformer that is used to drive many fluorescent tubes, comprising: a magnetic core; One lateral coils are around this magnetic core pars intermedia; One first second siding ring and second second siding ring on this magnetic core and lay respectively at the both sides of this first siding ring, have the identical number of turn.
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 (1)
1. transformer that is used to drive many fluorescent tubes comprises:
One magnetic core;
One lateral coils are around this magnetic core pars intermedia;
One first second siding ring and second second siding ring on this magnetic core and lay respectively at the both sides of this first siding ring, have the identical number of turn.
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 Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021479585A Division CN1494362A (en) | 2002-10-30 | 2002-10-30 | Voltage supply circuit of multi fluorescent lamp tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101384124A true CN101384124A (en) | 2009-03-11 |
Family
ID=34233068
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 Before (1)
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1494362A (en) |
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2002
- 2002-10-30 CN CNA021479585A patent/CN1494362A/en active Pending
- 2002-10-31 CN CNA200810146125XA patent/CN101384124A/en active Pending
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| Publication number | Publication date |
|---|---|
| CN1494362A (en) | 2004-05-05 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090311 |