CN201163571Y - Balancing transformator and back light device - Google Patents
Balancing transformator and back light device Download PDFInfo
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- CN201163571Y CN201163571Y CNU2008200012070U CN200820001207U CN201163571Y CN 201163571 Y CN201163571 Y CN 201163571Y CN U2008200012070 U CNU2008200012070 U CN U2008200012070U CN 200820001207 U CN200820001207 U CN 200820001207U CN 201163571 Y CN201163571 Y CN 201163571Y
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Abstract
The utility model provides a balance transformer and a backlight device using the same. The balance transformer comprises a first main coil, a second main coil, a primary coil and a conductor; the first main coil has a first contact and a second contact; the second main coil has a third contact and a fourth contact; the primary coil is corresponding to the first main coil and the second main coil; the conductor connects the first contact with the fourth contact in series. The balance transformer drives the backlight device to emit light and balances the current of a plurality of light emitting units in the backlight device.
Description
Technical field
The back lighting device that the utility model relates to a kind of balancing transformer and uses this balancing transformer, and particularly relate to a kind of back lighting device that can drive the balancing transformer of a plurality of luminescence units and use this balancing transformer.
Background technology
In recent years, along with LCD (Liquid Crystral Display, LCD) size of panel constantly increases, (the high-quality light source that provides panel of LCD required is provided more widely for Cold Cathode Fluorescent Lamp, back lighting device CCFL) to comprise a plurality of cold cathode fluorescent lamp.
The biggest problem that many fluorescent tubes back lighting device is faced is: how to make each lamp tube current can both keep about equally, have stable and brightness uniformly to guarantee the light source that offers display panels.
In order to solve the above problems, a kind of Jin balancing circuitry (Jin balance circuit) that can be applicable to the back lighting device of many fluorescent tubes is suggested.Please refer to Fig. 1, Fig. 1 shows the schematic diagram of the back lighting device 1 that has Jin balancing circuitry structure in the prior art.As shown in Figure 1, suppose that back lighting device 1 includes ten luminescence units 12, because in Jin balancing circuitry structure, luminescence unit 12 of balancing transformer 10 serial connections, therefore, back lighting device 1 needs ten balancing transformers 10 altogether, just can make the lamp current of each luminescence unit 12 of flowing through reach about equally effect.
Because the size of panel of LCD constantly increases, represent that needed fluorescent tube also increases thereupon.If use above-mentioned Jin balancing circuitry to come equiulbrium flow to make it about equally through each lamp tube current, the balancing transformer that just needs corresponding quantity, in addition, (Printed Circuit Board PCB) also must strengthen its size along with the quantity increase of balancing transformer to printed circuit board (PCB).
On the other hand, above-mentioned Jin balancing circuitry needs the power supply of opposed polarity to drive, yet in existing Jin balancing circuitry structure, will face to the problem of the insulation distance between two opposed polarity circuits.Traditional solution is to utilize double-layer printing circuit board and high pressure bridger (High-VoltageJumper) to increase insulation distance.
In sum, in the large scale liquid crystal display pannel, the increase of balancing transformer quantity, the increasing of printed circuit board sizes, the increase of high pressure bridger quantity and use of double-layer printing circuit board or the like all can cause the rising of back lighting device production cost.
The utility model content
A category of the present utility model is to provide a kind of balancing transformer, in order to the luminescence unit in driving and the balance back lighting device, to address the above problem.
According to a specific embodiment, balancing transformer of the present utility model comprises first main coil, second main coil, coil and conductor for the first time, wherein first main coil, second main coil and for the first time coil the coiling number about equally.First main coil has first contact and second contact, and second main coil then has the 3rd contact and the 4th contact.For the first time corresponding first main coil of coil and corresponding second main coil, and for the first time coil and first main coil and second main coil the coiling number about equally.Conductor is connected in series first contact of first main coil and the 4th contact of second main coil.
According to another specific embodiment, first contact of its first main coil of balancing transformer of the present utility model can be electrically connected a unipolarity high voltage source, and by conductor this unipolarity high voltage source is conducted to the 4th contact.Second contact and the 3rd contact can be electrically connected the luminescence unit in the backlight module respectively.By this, this balancing transformer can drive described luminescence unit.Since for the first time the coiling number of coil and first main coil and second main coil about equally, so described luminescence unit of this balancing transformer energy balance.In addition, coil can further be electrically connected a feedback control circuit for the first time.
Another category of the present utility model is to provide a kind of back lighting device that uses novel balancing transformer to come the electric current of each luminescence unit of balance.
According to a specific embodiment, back lighting device of the present utility model comprises 2N fluorescent tube and N balancing transformer.Wherein, N is a positive integer.
In this specific embodiment, N balancing transformer is electrically connected to 2N fluorescent tube.K balancing transformer in this N balancing transformer comprises one first main coil, one second main coil, a coil and a conductor for the first time.Wherein, k is the positive integer of scope between 1 to N.First main coil has first contact and second contact, and second main coil then has the 3rd contact and the 4th contact.For the first time corresponding first main coil of coil and corresponding second main coil, and for the first time coil and first main coil and second main coil the coiling number about equally.Conductor is connected in series first contact of first main coil and the 4th contact of second main coil.
Second contact of first main coil of k balancing transformer can be connected in series 2N (2k-1) individual fluorescent tube in the fluorescent tube.The 3rd contact of second main coil of k balancing transformer can be connected in series 2k fluorescent tube in 2N the fluorescent tube, and the 4th contact of second main coil of k balancing transformer can be connected in series first contact of N (k+1) individual transformer in the balancing transformer.By this, N balancing transformer can drive 2N luminescence unit.Since each for the first time coil and each first main coil and each second main coil the coiling number about equally, so 2N luminescence unit of balancing transformer energy balance.In addition, all of N balancing transformer coil for the first time can be connected in series mutually to form a loop, and this loop can further be electrically connected a feedback control circuit.
According to another specific embodiment, back lighting device of the present utility model is except each unit with above-mentioned specific embodiment, and each balancing transformer further comprises coil for the second time.Coil is electrically connected a protective circuit for the second time, makes balancing transformer avoid being in the upset operation state by protective circuit.
According to another specific embodiment, back lighting device of the present utility model further comprises 2N the high-voltage capacitance that is serially connected with 2N fluorescent tube respectively except each unit with last specific embodiment.In addition, first contact of the 1st balancing transformer in N balancing transformer can be electrically connected to a unipolar high voltage source.
Can be further understood by following utility model detailed description and accompanying drawing about advantage of the present utility model and spirit.
Description of drawings
Fig. 1 shows the schematic diagram of the back lighting device that has Jin balancing circuitry structure in the prior art.
Fig. 2 A shows the internal structure schematic diagram according to the balancing transformer of a specific embodiment of the present utility model.
Fig. 2 B shows the internal structure schematic diagram according to the balancing transformer of another specific embodiment of the present utility model.
Fig. 3 shows the schematic diagram of the balancing transformer formation balancing circuitry of Fig. 2 B.
Fig. 4 A and Fig. 4 B show the schematic diagram of the luminescence unit serial connection high-voltage capacitance of Fig. 3.
Fig. 5 shows the schematic diagram according to the back lighting device of a specific embodiment of the present utility model.
Fig. 6 shows the schematic diagram according to the back lighting device of another specific embodiment of the present utility model.
The reference numeral explanation
1,4,5: back lighting device 12,40,52: luminescence unit
10,2,50: 20: the first main coils of balancing transformer
202: the second contacts of 200: the first contacts
220: the three contacts of 22: the second main coils
Contact 24,504 in 222: the four: coil for the first time
28,506: coil 26,502 for the second time: conductor
30,42,54: 32: the first luminescence units of unipolarity high voltage source
36,44,56: feedback control circuit 38,46,58: protective circuit
C: high-voltage capacitance
Embodiment
Please refer to Fig. 2 A, Fig. 2 A shows the internal structure schematic diagram according to the balancing transformer 2 of a specific embodiment of the present utility model.Shown in Fig. 2 A, balancing transformer 2 comprises first main coil 20, second main coil 22, coil 24 and conductor 26 for the first time.
In this specific embodiment, first main coil 20 comprises first contact 200 and second contact, 202, the second main coils 22 comprise the 3rd contact 220 and the 4th contact 222.Coil 24 corresponding first main coil 20 and second main coils 22 for the first time.Conductor 26 serial connection first contact 202 and the 4th contacts 222, therefore, when the external power supply of first contact 202, this power supply can conduct to the 4th contact 222 by conductor 26.
In addition, in same balancing transformer 2, the coiling number of first main coil 20, second main coil 22 and coil 24 for the first time can for, but be not subject to, the three about equally.
Please refer to Fig. 2 B, Fig. 2 B shows the internal structure schematic diagram according to the balancing transformer 2 of another specific embodiment of the present utility model.Shown in Fig. 2 B, be in the balancing transformer 2 of this specific embodiment different with a last specific embodiment of this specific embodiment further comprises coil 28 for the second time.Note that in actual applications for the second time coil 28 can be pulled out two contacts the coil 24 from the first time and formed.In addition, the other parts of the balancing transformer 2 of this specific embodiment, all the corresponding unit with a last specific embodiment is identical, does not repeat them here.
Please refer to Fig. 3, Fig. 3 shows the schematic diagram of the balancing transformer 2 formation balancing circuitrys of Fig. 2 B.As shown in Figure 3, first contact 200 of balancing transformer 2 is electrically connected unipolarity high voltage source 30, the second contacts 202 serial connections first luminescence unit 32, and the 3rd contact 220 serial connections second luminescence unit 34.By unipolarity high voltage source 30, first main coil 20, second main coil 22 and conductor 26 can drive first luminescence unit 32 and second luminescence unit 34 is luminous.
In this specific embodiment, since first main coil 20, second main coil 22 and for the first time coil 24 the coiling number all about equally, therefore, according to the energy conservation law, provide the current value that will be approximately equal to second luminescence unit 34 to the current value of first luminescence unit 32.In addition, coil 24 is electrically connected feedback control circuit 36 for the first time, feedback control circuit 36 can be by the current value of first time coil 24 induction first luminescence units 32 and second luminescence unit 34, and adjust the magnitude of voltage of unipolarity high voltage source 30 according to this, cause the electric current of first luminescence unit 32 and second luminescence unit 34 to reach the current value that designer or user set.
In addition, the coil 28 electrical connection protective circuits 38 second time of this specific embodiment can make balancing transformer 2 avoid being in the upset operation state with protection balancing transformer 2 by protective circuit 38.For example; when first luminescence unit 32 or second luminescence unit 34 damage and cause open circuit; the electric current of first main coil 20 of coil 28 inductions for the second time changes, and 38 results according to the coil 28 inductions second time of protective circuit optionally stop balancing transformer 2 or stop the voltage supply of unipolarity high voltage source 30.
In actual applications, because the resistance diversity factor difference of each unit of balancing circuitry of above-mentioned specific embodiment also can cause the electric current of the luminescence unit of flowing through to produce deviate.The size that note that this deviate determines according to the resistance of other unit in first main coil, second main coil, conductor, luminescence unit or the balancing circuitry, is not a fixed value.Improve this phenomenon, can be in the very little high-voltage capacitance of side serial connection capacitance of luminescence unit, the resistance diversity factor of other unit in first main coil, second main coil, conductor, luminescence unit or the balancing circuitry all can be left in the basket disregard, obtain stable by this and lamp current uniformly.
Please refer to Fig. 4 A and Fig. 4 B, Fig. 4 A and Fig. 4 B show the schematic diagram of the luminescence unit serial connection high-voltage capacitance C of Fig. 3.Shown in Fig. 4 A, the high-voltage capacitance C with little capacitance is serially connected with the high-pressure side of first luminescence unit 32 and second luminescence unit 34 respectively, that is, be serially connected with between balancing transformer and the luminescence unit.On the other hand, shown in Fig. 4 B, high-voltage capacitance C also can be serially connected with the low-pressure end of first luminescence unit 32 and second luminescence unit 34 respectively.
Please in the lump with reference to figure 5 and Fig. 2 B, Fig. 5 shows the schematic diagram according to the back lighting device 4 of a specific embodiment of the present utility model.As shown in Figure 5, back lighting device 4 comprises N balancing transformer 2, a 2N luminescence unit 40, unipolarity high voltage source 42, feedback control circuit 44 and protective circuit 46, and wherein N is a positive integer.The internal structure that note that each balancing transformer 2 herein is shown in Fig. 2 B, and the function of each unit of each balancing transformer 2 also function with the corresponding unit of above-mentioned specific embodiment is identical, does not repeat them here.
In this specific embodiment, (2k-1) individual luminescence unit 40 in 2N luminescence unit 40 of second contact, 202 serial connections of k balancing transformer 2 in N balancing transformer 2, and 2k luminescence unit 40 in 2N luminescence unit 40 of the 3rd contact 220 serial connections, wherein k is the positive integer between the scope 1 to N.First contact 200 of the individual balancing transformer 2 of 222 serial connections to the of the 4th contact (k+1) of k balancing transformer 2, therefore, the conductor 26 by each balancing transformer 2 can be connected in series all first contacts 200 and the 4th contact 222.
In this specific embodiment, first contact 200 of the 1st balancing transformer 2 in N balancing transformer 2 is electrically connected unipolarity high voltage sourcies 42.Because conductor 26 all first contacts 200 of serial connection and the 4th contacts 222 of each balancing transformer 2, so unipolarity high voltage source 42 can provide voltage to each first contact 200 and each the 4th contact 222.Luminous by unipolarity high voltage source 42, each first main coil 20 and each second main coil, 22 energy driving N luminescence unit 40.On practice,, therefore, in the circuit arrangement of back lighting device 4, can avoid using the high pressure bridger because balancing transformer 2 is connected in series first contact 200 and the 4th contacts 222 in its body interior with conductor 26.
Since each first main coil 20, each second main coil 22 and each for the first time coil 24 the coiling number all about equally, therefore, according to the energy conservation law, provide to the current value of each luminescence unit 40 will be about equally.In addition, each one loop of coil 24 mutual serial connection formation for the first time, this loop can further be connected in series feedback control circuit 44, feedback control circuit 44 passes through each current value of coil 24 each luminescence unit 40 of induction for the first time, and adjust the magnitude of voltage of unipolarity high voltage source 30 according to this, cause the electric current of each luminescence unit 40 to reach the current value that designer or user set.
In addition, each of this specific embodiment coil 28 for the second time is electrically connected protective circuit 46, can make each balancing transformer 2 avoid being in the upset operation state to protect each balancing transformer 2 by protective circuit 46.For example; when (2k-1) individual luminescence unit 40 damages and causes open circuit; the electric current of the coil 28 inductions second time first main coil 20 of k balancing transformer 2 changes; 46 results according to the coil 28 inductions second time of protective circuit optionally stop k balancing transformer 2 or all balancing transformers 2, or stop the voltage supply of unipolarity high voltage source 30.
Similarly, back lighting device 4 can comprise the high-voltage capacitance C that is serially connected with each luminescence unit 40 respectively, and these high-voltage capacitances C has little capacitance.In this specific embodiment, high-voltage capacitance C is serially connected with the low-pressure end of each luminescence unit 40 respectively, but also can be serially connected with the high-pressure side of each luminescence unit 40 in practical application respectively, that is, between each balancing transformer 2 and each luminescence unit 40.It should be noted that, on practice, high-voltage capacitance C and inessential being present among the back lighting device 4, whether the electric current that end is seen each luminescence unit 40 needing determines whether serial connection high-voltage capacitance C in each luminescence unit 40 because of the resistance diversity factor of each unit in the back lighting device 4 has big difference.For example, if the electric current difference between any two luminescence units surpasses 5%, and the designer judges that this situation will cause user's non-uniform light of this two luminescence unit of identification easily, just can be connected in series respectively high-voltage capacitance C in each luminescence unit to improve the electric current difference between two luminescence units.
Please refer to Fig. 6, Fig. 6 shows the schematic diagram according to the back lighting device 5 of another specific embodiment of the present utility model.As shown in Figure 6, be in back lighting device 5 different with above-mentioned specific embodiment of the back lighting device 5 of this specific embodiment comprises M balancing transformer 50, and each balancing transformer 50 further comprises N main coil 500, and wherein, M and N are a positive integer.Clean and tidy for drawing, in Fig. 6, only show a balancing transformer 50.
In this specific embodiment, a contact wherein of each main coil 500 is connected in series one of them of N luminescence unit 52 respectively, and another contact of each main coil 500 is connected in series mutually by conductor 502.Therefore, can a driving N luminescence unit by a balancing transformer 50.Similarly, each balancing transformer 50 of the back lighting device of this specific embodiment comprises for the first time coil 504 and coil 506 for the second time, and wherein the coiling number of coil 504 and each main coil 500 is all about equally for the first time; The 1st main coil 500 of the 1st balancing transformer 50 is electrically connected unipolarity high voltage source 54, and, N main coil 500 of k balancing transformer 50, be connected in series the 1st main coil 500 of (k+1) individual balancing transformer again, cause each balancing transformer 50 all can receive the voltage that unipolarity high voltage source 54 is supplied, to drive each luminescence unit, wherein, k is the positive integer of scope 1 to M; Each of the M of back lighting device 5 balancing transformer 50 coil for the first time is connected in series formation one loop (not shown in figure) mutually, and this loop further is connected in series feedback control circuit 56; Coil 506 is electrically connected protective circuit 58 for the second time; Each luminescence unit 52 is connected in series high-voltage capacitance C respectively.The function of above-mentioned each unit is all identical with corresponding each Elementary Function of aforesaid specific embodiment, does not repeat them here.
Compared to prior art, balancing transformer of the present utility model and the back lighting device that uses this balancing transformer, can by balancing transformer drive two in addition the more luminous and equiulbrium flow of multi-illuminating unit through the electric current of each luminescence unit.What is more, because balancing transformer has a conductor and is connected in series each main coil, therefore can avoid using the high pressure bridger.In addition, according to balancing transformer structure, the driving power of back lighting device can use the unipolarity voltage source and avoid the problem of insulation distance, just can use the single-layer printed circuit plate in the selection of printed circuit board (PCB).In sum, balancing transformer of the present utility model and use the back lighting device of this balancing transformer can effectively reduce the production cost of back lighting device.
By the above detailed description of preferred embodiments, hope can be known description feature of the present utility model and spirit more, and is not to come category of the present utility model is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain within the scope that is arranged in claim of the present utility model of various changes and tool equality.Therefore, claim of the present utility model should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.
Claims (17)
1. a balancing transformer is characterized in that, comprises:
One first main coil has one first contact and one second contact;
One second main coil has one the 3rd contact and one the 4th contact;
One coil for the first time is to should first main coil and this second main coil; And
One conductor is connected in series this first contact of this first main coil and the 4th contact of this second main coil.
2. balancing transformer as claimed in claim 1 is characterized in that, wherein this first contact of this first main coil is electrically connected a high voltage source.
3. balancing transformer as claimed in claim 2 is characterized in that, wherein this high voltage source is a unipolarity high voltage source.
4. balancing transformer as claimed in claim 1 is characterized in that, wherein this first main coil, this second main coil and for the first time coil the coiling number about equally.
5. balancing transformer as claimed in claim 1 is characterized in that, wherein this, coil further comprised a coil for the second time first time.
6. balancing transformer as claimed in claim 5 is characterized in that, wherein this, coil was electrically connected a protective circuit second time.
7. balancing transformer as claimed in claim 1 is characterized in that, wherein this second contact is electrically connected to one first luminescence unit in the back lighting device, and the 3rd contact is electrically connected to one second luminescence unit in this back lighting device.
8. balancing transformer as claimed in claim 7 is characterized in that, wherein this first luminescence unit and this second luminescence unit are connected in series a high-voltage capacitance respectively.
9. balancing transformer as claimed in claim 8 is characterized in that, wherein said high-voltage capacitance is serially connected with between this first luminescence unit and this second contact respectively and between this second luminescence unit and the 3rd contact.
10. a back lighting device is characterized in that, comprises:
2N fluorescent tube, N are a positive integer; And
N balancing transformer is electrically connected to this 2N fluorescent tube, and k is the positive integer of scope between 1 to N, and k balancing transformer in this N balancing transformer comprises:
One first main coil has one first contact and one second contact, and this second contact is connected in series (2k-1) the individual fluorescent tube in this 2N fluorescent tube;
One second main coil has one the 3rd contact and one the 4th contact, and the 3rd contact is connected in series 2k fluorescent tube in this 2N fluorescent tube, and the 4th contact is connected in series this first contact of (k+1) the individual transformer in this N balancing transformer;
One coil for the first time, corresponding to this first main coil and this second main coil, this N in this N balancing transformer the first time coil be connected in series formation one loop mutually; And
One conductor is connected in series this first contact and the 4th contact.
11. back lighting device as claimed in claim 10 is characterized in that, further comprises:
One unipolarity high voltage source is electrically connected to this first contact of the 1st balancing transformer in this N balancing transformer.
12. back lighting device as claimed in claim 10 is characterized in that, wherein this first main coil, this second main coil and for the first time coil the coiling number about equally.
13. back lighting device as claimed in claim 10 is characterized in that, wherein each for the first time coil further comprise a coil for the second time.
14. back lighting device as claimed in claim 13 is characterized in that, wherein this, coil was electrically connected a protective circuit second time.
15. back lighting device as claimed in claim 10 is characterized in that, wherein this N for the first time coil be connected in series further serial connection one feedback control circuit of formed this loop mutually.
16. back lighting device as claimed in claim 10 is characterized in that, wherein each fluorescent tube is connected in series a high-voltage capacitance respectively.
17. back lighting device as claimed in claim 16 is characterized in that, wherein said high-voltage capacitance is serially connected with respectively between each fluorescent tube and corresponding first main coil or second main coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200012070U CN201163571Y (en) | 2008-01-09 | 2008-01-09 | Balancing transformator and back light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200012070U CN201163571Y (en) | 2008-01-09 | 2008-01-09 | Balancing transformator and back light device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201163571Y true CN201163571Y (en) | 2008-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200012070U Expired - Fee Related CN201163571Y (en) | 2008-01-09 | 2008-01-09 | Balancing transformator and back light device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201163571Y (en) |
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2008
- 2008-01-09 CN CNU2008200012070U patent/CN201163571Y/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081210 Termination date: 20120109 |