CN201197215Y - Current balancing apparatus and multi-light tube backlight module - Google Patents
Current balancing apparatus and multi-light tube backlight module Download PDFInfo
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- CN201197215Y CN201197215Y CNU2008200033325U CN200820003332U CN201197215Y CN 201197215 Y CN201197215 Y CN 201197215Y CN U2008200033325 U CNU2008200033325 U CN U2008200033325U CN 200820003332 U CN200820003332 U CN 200820003332U CN 201197215 Y CN201197215 Y CN 201197215Y
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Abstract
The utility model discloses a current balancing device, which comprises a first transformer and a second transformer, wherein the first transformer comprises a first main coil and a first auxiliary coil which corresponds to the first main coil and is coupled to a display device in a multi-lighting tube backlight module; and the second transformer comprises a second main coil and a second auxiliary coil which corresponds to the second main coil and is coupled to the display device, wherein the first main coil is connected in series with the second main coil, and the first main coil and the second main coil respectively receive a first square wave signal and a second square wave signal.
Description
Technical field
The utility model relates to a kind of current balancing device, particularly relates to a kind of current balancing device that is applied to multi-light tube backlight module.
Background technology
In recent years, along with the size of display panels constantly increases, (the high-quality light source that provides display panels required is provided more widely for Cold Cathode Fluorescent Lamp, back lighting device CCFL) to comprise a plurality of cathode fluorescent tubes.
Yet the biggest problem that many fluorescent tubes back lighting device is faced is: how to make each lamp tube current all can keep about equally, have highly stable and uniform brightness to guarantee the light source that offers display panels.
See also Fig. 1.Fig. 1 shows the schematic diagram of many fluorescent tubes back lighting device 1 in the prior art.As shown in Figure 1, the transformer 10,12 in many fluorescent tubes back lighting device 1 comprises main coil 100,120 and lateral coil 102,122 respectively, and lateral coil 102,122 couples respectively and provides current to fluorescent tube 14 so that fluorescent tube 14 is luminous.Yet, because main coil the 100, the 120th, couple mutually and the specification of each transformer 10,12 is not quite similar, so the electric current of the main coil 100,120 that can cause flowing through is unequal with parallel connection.Therefore, lateral coil 102,122 electric currents of being sensed are also inequality, cause the brightness irregularities of fluorescent tube 14.
Therefore, main purpose of the present utility model is to provide a kind of current balancing device, to address the above problem.
The utility model content
The multi-light tube backlight module that a purpose of the present utility model is to provide a kind of current balancing device and uses this kind current balancing device.
In according to a specific embodiment of the present utility model, current balancing device comprises first transformer and second transformer.First transformer comprises first main coil and the coil first time.For the first time coil is corresponding to first main coil and be coupled to display unit in the multi-light tube backlight module.Second transformer comprises second main coil and the coil second time.For the second time coil is corresponding to second main coil and be coupled to display unit.Wherein, first main coil is connected with second main coil, and first main coil and second main coil receive first square-wave signal and second square-wave signal respectively.
In according to another specific embodiment of the present utility model, current balancing device comprises first transformer and second transformer.First transformer comprises first main coil, for the first time coil and coil for the second time.For the first time coil and for the second time coil corresponding to first main coil and be coupled to display unit in the multi-light tube backlight module.Second transformer comprises second main coil, coil and the 4th coil for the third time.Coil and the 4th coil are corresponding to second main coil and be coupled to display unit in the multi-light tube backlight module for the third time.Wherein, first main coil is connected with second main coil, and first main coil and second main coil receive first square-wave signal and second square-wave signal respectively.
According to another specific embodiment of the present utility model is a kind of multi-light tube backlight module.This multi-light tube backlight module comprises control circuit, display unit, first transformer and second transformer.Control circuit is in order to produce first square-wave signal and second square-wave signal.First transformer comprises first main coil and the coil first time.First main coil receives first square-wave signal.For the first time coil is corresponding to first main coil and be coupled to display unit.Second transformer comprises second main coil and the coil second time.Second main coil is connected with first main coil and is received second square-wave signal.For the second time coil is corresponding to second main coil and be coupled to display unit.
According to another specific embodiment of the present utility model also is a kind of multi-light tube backlight module.This multi-light tube backlight module comprises control circuit, display unit, first transformer and second transformer.Control circuit is in order to produce first square-wave signal and second square-wave signal.First transformer comprises first main coil, for the first time coil and coil for the second time.First main coil receives first square-wave signal.For the first time coil and for the second time coil corresponding to first main coil and be coupled to display unit.Second transformer comprises second main coil, coil and the 4th coil for the third time.Second main coil is connected with first main coil and is received second square-wave signal.Coil and the 4th coil are corresponding to second main coil and be coupled to display unit for the third time.
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 many fluorescent tubes back lighting device in the prior art.
Fig. 2 shows the circuit diagram according to the current balancing device of first specific embodiment of the present utility model.
Fig. 3 shows the schematic diagram that display unit comprises U type cathode fluorescent tube.
Fig. 4 shows the circuit diagram according to the current balancing device of second specific embodiment of the present utility model.
Fig. 5 A shows the structural representation of the transformer in the current balancing device among Fig. 2.
Fig. 5 B shows the structural representation of the transformer in the current balancing device among Fig. 4.
The reference numeral explanation
1: many fluorescent tubes back lighting device 10,12: transformer
100,120: main coil 102,122: lateral coil
14: fluorescent tube 2,3: current balancing device
20,30: the first transformers 22,32: the second transformers
200,300: the first main coils 220,320: the second main coils
202,302: coil 222,304 for the first time: coil for the second time
322: 324: the four times coils of coil for the third time
24,34: display unit
P1: the first square-wave signal P2: second square-wave signal
240,340: the first linear pattern cathode fluorescent tubes
242,342: the second linear pattern cathode fluorescent tubes
244:U type cathode fluorescent tube
P: main coil S, S1, S2: inferior coil
4: drum stand.
Embodiment
See also Fig. 2.Fig. 2 shows the circuit diagram according to the current balancing device 2 of first specific embodiment of the present utility model.
As shown in Figure 2, current balancing device 2 comprises first transformer 20 and second transformer 22.First transformer 20 comprises first main coil 200 and coil 202 first time.For the first time coil 202 is corresponding to first main coil 200 and be coupled to display unit 24 in the multi-light tube backlight module.Second transformer 22 comprises second main coil 220 and coil 222 second time.For the second time coil 222 is corresponding to second main coil 220 and be coupled to display unit 24.See also Fig. 5 A.Fig. 5 A shows the structural representation of the transformer in the current balancing device 2 among Fig. 2.Shown in Fig. 5 A, on behalf of main coil and, S, P promptly promptly represent time coil, and main coil P all is wrapped on the drum stand 4 with time coil S.
As shown in Figure 2, first main coil 200 is connected with second main coil 220, and first main coil 200 and second main coil 220 receive the first square-wave signal P1 and the second square-wave signal P2 respectively.The first square-wave signal P1 and the second square-wave signal P2 all can be pulse-width modulation (PWM) signals.In actual applications, the first square-wave signal P1 and the second square-wave signal P2 can be produced by full bridge circuit or half bridge circuit.Be noted that the current balancing device 2 among this embodiment can comprise a plurality of transformers, promptly do not exceed, and the main coil of each transformer be one another in series with first transformer 20 among Fig. 2 and second transformer 22.
In actual applications, display unit 24 can comprise many cathode fluorescent tubes.For example, as shown in Figure 2, in this embodiment, display unit 24 can comprise the first linear pattern cathode fluorescent tube 240 and the second linear pattern cathode fluorescent tube 242.For the first time coil 202 and for the second time coil 222 be coupled to the first linear pattern cathode fluorescent tube 240 and the second linear pattern cathode fluorescent tube 242 respectively.
See also Fig. 3.In one embodiment, display unit 24 can also comprise U type cathode fluorescent tube 244.For the first time coil 202 and for the second time 222 of coils be coupled to the two ends of U type cathode fluorescent tube 244 respectively.Be noted that as shown in Figure 3, in this embodiment, the phase place of the first square-wave signal P1 is opposite haply with the phase place of the second square-wave signal P2.
Because first main coil 200 is connected with second main coil 220, first main coil 200 of therefore flowing through is identical with the electric current I (being primary side current) of second main coil 220, and the frequency of for example working is identical.Because primary side current is identical, therefore the secondary side current that the coil 202 and the second time, coil 222 was sensed for the first time is also identical.By this, identical electric current can provide to the first linear pattern cathode fluorescent tube 240 and the second linear pattern cathode fluorescent tube 242, makes it have stable and brightness uniformly.
See also Fig. 4.Fig. 4 shows the circuit diagram according to the current balancing device 3 of second specific embodiment of the present utility model.Current balancing device 3 comprises first transformer 30 and second transformer 32.First transformer 30 comprises first main coil 300, for the first time coil 302 and coil 304 for the second time.For the first time coil 302 and for the second time coil 304 corresponding to first main coil 300 and be coupled to display unit 34 in the multi-light tube backlight module.Second transformer 32 comprises second main coil 320, coil 322 and the 4th coil 324 for the third time.Coil 322 and the 4th coil 324 are corresponding to second main coil 320 and be coupled to display unit 34 in the multi-light tube backlight module for the third time.
See also Fig. 5 B.Fig. 5 B shows the structural representation of the transformer in the current balancing device 3 among Fig. 4.Shown in Fig. 5 B, P promptly represents main coil, and S1 and S2 promptly represent time coil, and main coil P all is wrapped on the drum stand 4 with time coil S1, S2.Basically, the transformer in the current balancing device 3 in this embodiment promptly is one to push away two transformers, pushes away three transformers, and pushes away four transformers but the utility model can also be applied to one ... wait by that analogy.Similarly, the current balancing device 3 among this embodiment can also comprise a plurality of transformers, and the main coil of each transformer is one another in series.
According to the 3rd specific embodiment of the present utility model is a kind of multi-light tube backlight module, and this multi-light tube backlight module is used the current balancing device in first specific embodiment.Please consulting Fig. 2 haply again about the framework of multi-light tube backlight module gets final product.Multi-light tube backlight module comprises control circuit, display unit, first transformer and second transformer.Control circuit is in order to produce first square-wave signal and second square-wave signal.First transformer comprises first main coil and the coil first time.First main coil receives first square-wave signal.For the first time coil is corresponding to first main coil and be coupled to display unit.Second transformer comprises second main coil and the coil second time.Second main coil is connected with first main coil and is received second square-wave signal.For the second time coil is corresponding to second main coil and be coupled to display unit.
According to the 4th specific embodiment of the present utility model is a kind of multi-light tube backlight module, and this multi-light tube backlight module is used the current balancing device in second specific embodiment.Please consulting Fig. 4 haply again about the framework of multi-light tube backlight module gets final product.Multi-light tube backlight module comprises control circuit, display unit, first transformer and second transformer.Control circuit is in order to produce first square-wave signal and second square-wave signal.First transformer comprises first main coil, for the first time coil and coil for the second time.First main coil receives first square-wave signal.For the first time coil and for the second time coil corresponding to first main coil and be coupled to display unit.Second transformer comprises second main coil, coil and the 4th coil for the third time.Second main coil is connected with first main coil and is received second square-wave signal.Coil and the 4th coil are corresponding to second main coil and be coupled to display unit for the third time.
Compared to prior art, can be applied to multi-light tube backlight module according to current balancing device of the present utility model, make primary side current equate, and then the secondary side current of sensing is equated.By this, each root lamp tube current of flowing through is also all identical, guarantees that the light source that offers display floater has highly stable and uniform brightness.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present utility model and spirit, and be 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 in the category of the claim that is arranged in the desire application of the utility model institute of various changes and tool equality.Therefore, the category of the claim that the utility model is applied for 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 (20)
1. a current balancing device is used the usefulness for a multi-light tube backlight module, it is characterized in that: this current balancing device comprises:
One first transformer comprises:
One first main coil; And
One coil for the first time, this, coil was corresponding to this first main coil and be coupled to a display unit in this multi-light tube backlight module first time; And
One second transformer comprises:
One second main coil; And
One coil for the second time, this, coil was corresponding to this second main coil and be coupled to this display unit second time;
Wherein, this first main coil is connected with this second main coil, and this first main coil and this second main coil receive one first square-wave signal and one second square-wave signal respectively.
2. current balancing device as claimed in claim 1, it is characterized in that: this display unit comprises one first linear pattern cathode fluorescent tube and one second linear pattern cathode fluorescent tube, and this first time coil and this second time coil be coupled to this first linear pattern cathode fluorescent tube and this second linear pattern cathode fluorescent tube respectively.
3. current balancing device as claimed in claim 1 is characterized in that: this display unit comprises a U type cathode fluorescent tube, and this first time coil and this second time coil be coupled to the two ends of this U type cathode fluorescent tube respectively.
4. current balancing device as claimed in claim 3 is characterized in that: the phase place of this first square-wave signal is opposite haply with the phase place of this second square-wave signal.
5. current balancing device as claimed in claim 1 is characterized in that: this first square-wave signal and this second square-wave signal are produced by a full bridge circuit or a half bridge circuit.
6. multi-light tube backlight module, it is characterized in that: this multi-light tube backlight module comprises:
One control circuit is in order to produce one first square-wave signal and one second square-wave signal;
One display unit;
One first transformer comprises:
One first main coil receives this first square-wave signal; And
One coil for the first time, this, coil was corresponding to this first main coil and be coupled to this display unit first time; And
One second transformer comprises:
One second main coil is connected with this first main coil and is received this second square-wave signal; And
One coil for the second time, this, coil was corresponding to this second main coil and be coupled to this display unit second time.
7. multi-light tube backlight module as claimed in claim 6, it is characterized in that: this display unit comprises one first linear pattern cathode fluorescent tube and one second linear pattern cathode fluorescent tube, and this first time coil and this second time coil be coupled to this first linear pattern cathode fluorescent tube and this second linear pattern cathode fluorescent tube respectively.
8. multi-light tube backlight module as claimed in claim 6 is characterized in that: this display unit comprises a U type cathode fluorescent tube, and this first time coil and this second time coil be coupled to the two ends of this U type cathode fluorescent tube respectively.
9. multi-light tube backlight module as claimed in claim 8 is characterized in that: the phase place of this first square-wave signal is opposite haply with the phase place of this second square-wave signal.
10. multi-light tube backlight module as claimed in claim 6 is characterized in that: this control circuit is a full bridge circuit or a half bridge circuit.
11. a current balancing device is used the usefulness for a multi-light tube backlight module, it is characterized in that: this current balancing device comprises:
One first transformer comprises:
One first main coil;
One coil for the first time; And
One coil for the second time, this first time coil and this second time coil corresponding to this first main coil and be coupled to a display unit in this multi-light tube backlight module; And
One second transformer comprises:
One second main coil;
One coil for the third time; And
One the 4th coil, this for the third time coil and the 4th coil corresponding to this second main coil and be coupled to this display unit in this multi-light tube backlight module;
Wherein, this first main coil is connected with this second main coil, and this first main coil and this second main coil receive one first square-wave signal and one second square-wave signal respectively.
12. current balancing device as claimed in claim 11, it is characterized in that: this display unit comprises one first linear pattern cathode fluorescent tube and one second linear pattern cathode fluorescent tube, and this first time coil and this second time coil be coupled to this first linear pattern cathode fluorescent tube and this second linear pattern cathode fluorescent tube respectively.
13. current balancing device as claimed in claim 11 is characterized in that: this display unit comprises a U type cathode fluorescent tube, and this first time coil and this second time coil be coupled to the two ends of this U type cathode fluorescent tube respectively.
14. current balancing device as claimed in claim 13 is characterized in that: the phase place of this first square-wave signal is opposite haply with the phase place of this second square-wave signal.
15. current balancing device as claimed in claim 11 is characterized in that: this first square-wave signal and this second square-wave signal are produced by a full bridge circuit or a half bridge circuit.
16. a multi-light tube backlight module is characterized in that: this multi-light tube backlight module comprises:
One control circuit is in order to produce one first square-wave signal and one second square-wave signal;
One display unit;
One first transformer comprises:
One first main coil receives this first square-wave signal;
One coil for the first time; And
One coil for the second time, this first time coil and this second time coil corresponding to this first main coil and be coupled to this display unit; And
One second transformer comprises:
One second main coil is connected with this first main coil and is received this second square-wave signal;
One coil for the third time; And
One the 4th coil, this for the third time coil and the 4th coil corresponding to this second main coil and be coupled to this display unit.
17. multi-light tube backlight module as claimed in claim 16, it is characterized in that: this display unit comprises one first linear pattern cathode fluorescent tube and one second linear pattern cathode fluorescent tube, and this first time coil and this second time coil be coupled to this first linear pattern cathode fluorescent tube and this second linear pattern cathode fluorescent tube respectively.
18. multi-light tube backlight module as claimed in claim 16 is characterized in that: this display unit comprises a U type cathode fluorescent tube, and this first time coil and this second time coil be coupled to the two ends of this U type cathode fluorescent tube respectively.
19. multi-light tube backlight module as claimed in claim 18 is characterized in that: the phase place of this first square-wave signal is opposite haply with the phase place of this second square-wave signal.
20. multi-light tube backlight module as claimed in claim 16 is characterized in that: this control circuit is a full bridge circuit or a half bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200033325U CN201197215Y (en) | 2008-02-03 | 2008-02-03 | Current balancing apparatus and multi-light tube backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200033325U CN201197215Y (en) | 2008-02-03 | 2008-02-03 | Current balancing apparatus and multi-light tube backlight module |
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| Publication Number | Publication Date |
|---|---|
| CN201197215Y true CN201197215Y (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200033325U Expired - Fee Related CN201197215Y (en) | 2008-02-03 | 2008-02-03 | Current balancing apparatus and multi-light tube backlight module |
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|---|---|
| CN (1) | CN201197215Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026459A (en) * | 2009-09-21 | 2011-04-20 | 冠捷投资有限公司 | Drive circuit of cold-cathode fluorescence lamp |
-
2008
- 2008-02-03 CN CNU2008200033325U patent/CN201197215Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026459A (en) * | 2009-09-21 | 2011-04-20 | 冠捷投资有限公司 | Drive circuit of cold-cathode fluorescence lamp |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20090218 Termination date: 20130203 |