CN1993008A - Discharge lamp driving apparatus - Google Patents
Discharge lamp driving apparatus Download PDFInfo
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- CN1993008A CN1993008A CN 200510121417 CN200510121417A CN1993008A CN 1993008 A CN1993008 A CN 1993008A CN 200510121417 CN200510121417 CN 200510121417 CN 200510121417 A CN200510121417 A CN 200510121417A CN 1993008 A CN1993008 A CN 1993008A
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Abstract
The invention relates to a discharge tube driver, which comprises a power converter and a transformer, wherein the converter has one anode output and one cathode output; the transformer has the first, second, third and fourth transformers; the fist input of first transformer, the second input of second transformer, the second input of third transformer, and the first input of fourth transformer are connected, while they are connected to the anode output of converter; the second input of first transformer, the first input of second transformer, the first input of third transformer, and the second input of fourth transformer are connected, while they are connected to the cathode output of converter. The invention can reduce the distance between tubes, to avoid splash.
Description
[technical field]
The present invention relates to a kind of discharge lamp driven apparatus, relate in particular to the discharge lamp driven apparatus that a kind of output voltage polar arrangement mode changes.
[background technology]
At present, the panel of LCD (LCD) mainly adopts discharge lamp (DischargeLamp) as backlight, and this kind fluorescent tube needs higher driving voltage just can light.Along with of the development of LCD panel size, then need to use a plurality of fluorescent tubes that enough brightness is provided to the maximization direction.
Fig. 1 is a traditional discharge lamp driven apparatus.Described discharge lamp driven apparatus comprises a power-switching circuit 10, a plurality of transformer T
1n(n=1,2,3 ...) and a plurality of fluorescent tube L
1n(n=1,2,3 ...).Wherein, each transformer all has an elementary winding and a level winding, and each elementary winding comprises a first input end a
1n(n=1,2,3 ...) and one second input b
1n(n=1,2,3 ...), each secondary winding comprises a high-pressure side c
1n(n=1,2,3 ...) and a low-pressure end d
1n(n=1,2,3 ...).Again, transformer T
1n(n=1,2,3 ...) the first input end a of elementary winding
1n(n=1,2,3 ...) link together, and be connected to an end of power-switching circuit 10 jointly, and same, transformer T
1n(n=1,2,3 ...) the second input b of elementary winding
1n(n=1,2,3 ...) link together, be connected to the other end of power-switching circuit 10 jointly.Transformer T
1n(n=1,2,3 ...) the high-pressure side c of secondary winding
1n(n=1,2,3 ...) the corresponding respectively fluorescent tube L that connects
1n(n=1,2,3 ...), and the low-pressure end d of its secondary winding
1n(n=1,2,3 ...) equal ground connection.
In the above-mentioned discharge lamp driven apparatus, transformer T
1n(n=1,2,3 ...) structure and characteristic be identical, and itself and power-switching circuit 10 and fluorescent tube L
1n(n=1,2,3 ...) between annexation all identical, so transformer T
1n(n=1,2,3 ...) the high-pressure side c of secondary winding
1n(n=1,2,3 ...) export fluorescent tube L to
1n(n=1,2,3 ...) voltage-phase, size also identical.Yet,, and then influence the inhomogeneous of whole LCD panel luminance even supply with each light tube electric voltage size, phase place is identical, still can produce the current imbalance problem.
Fig. 2 is another conventional discharge lamps drive unit.The difference of the discharge lamp driven apparatus of this discharge lamp driven apparatus and Fig. 1 is transformer T
2n(n=1,3,5 ... (2n-1)) the first input end a of elementary winding
2n(n=1,3,5 ... (2n-1)) with transformer T
2n(n=2,4,6 ... 2n) the second input b of elementary winding
2n(n=2,4,6 ... 2n) link together, and be connected to an end of power-switching circuit 20 jointly.Transformer T
2n(n=1,3,5 ... (2n-1)) the second input b of elementary winding
2n(n=1,3,5 ... (2n-1)) with transformer T
2n(n=2,4,6 ... 2n) the first input end a of elementary winding
2n(n=2,4,6 ... 2n) link together, be connected to the other end of power-switching circuit 20 jointly.
Above-mentioned discharge lamp driven apparatus exports adjacent two discharge lamp L to
1n(n=1,2,3 ...) voltage swing identical, phase place is opposite.Though use this kind framework discharge lamp driven apparatus can equiulbrium flow through each lamp tube current, make the LCD panel luminance even, since between adjacent two fluorescent tubes voltage difference bigger, then can link to each other at fluorescent tube cause arcing (arcing) phenomenon between the circuit.For fear of the generation of arcing phenomenon, then need increase the spread length between adjacent two fluorescent tubes, to increase the distance between the circuit; Or be perforate on circuit board, promptly increase the distance between the circuit, to reduce the possibility of adjacent fluorescent tube top-stitching road arcing.
Yet increasing fluorescent tube increases apart from the board area that meeting causes whole discharge lamp driven apparatus to use, and then has increased the volume of product; And perforate then can make circuit board mechanism stress relatively poor and cost is higher on circuit board.
[summary of the invention]
In view of this, need provide a kind of discharge lamp driven apparatus, utilize the change of output voltage polar arrangement mode, the lamp tube current balance and reduce spread length between the fluorescent tube of guaranteeing to flow through.
A kind of discharge lamp driven apparatus comprises a power-switching circuit and a transforming circuit.Power-switching circuit comprises a cathode output end and a cathode output end, and described transforming circuit links to each other with power-switching circuit, and it comprises one first transformer, one second transformer, one the 3rd transformer and one the 4th transformer respectively.Each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input.Second input of second input of the first input end of the described first primary winding, the second primary winding, the 3rd primary winding, the first input end of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.The first input end of second input of the described first primary winding, the first input end of the second primary winding, the 3rd primary winding, second input of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.
A kind of discharge lamp driven apparatus comprises a power-switching circuit and a plurality of transforming circuit.Power-switching circuit comprises a cathode output end and a cathode output end, and described transforming circuit links to each other with power-switching circuit, and it comprises one first transformer, one second transformer, one the 3rd transformer and one the 4th transformer respectively.Each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input.Second input of second input of the first input end of the described first primary winding, the second primary winding, the 3rd primary winding, the first input end of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.The first input end of second input of the described first primary winding, the first input end of the second primary winding, the 3rd primary winding, second input of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.
In the transforming circuit of the present invention, it is all identical with voltage swing, the phase place of the 4th fluorescent tube to be loaded on first fluorescent tube, and is forward voltage; It is identical with voltage swing, the phase place of the 3rd fluorescent tube to be loaded on second fluorescent tube, and is negative voltage.This kind output voltage arrangement mode can be under the essentially identical situation of each lamp current size be flowed through in assurance, the voltage difference that also can make some adjacent fluorescent tube is zero, avoids arcing phenomenon generation between circuit, and shortens distance between fluorescent tube, thereby reduce the area of circuit board, save cost.
[description of drawings]
Fig. 1 is a traditional discharge lamp driven apparatus;
Fig. 2 is another traditional discharge lamp driven apparatus;
Fig. 3 is the discharge lamp driven apparatus of first embodiment of the invention;
Fig. 4 is the discharge lamp driven apparatus of second embodiment of the invention;
Fig. 5 is the discharge lamp driven apparatus of third embodiment of the invention;
Fig. 6 is the discharge lamp driven apparatus of four embodiment of the invention;
Fig. 7 is the discharge lamp driven apparatus of fifth embodiment of the invention.
[embodiment]
Fig. 3 is the discharge lamp driven apparatus of first embodiment of the invention, and this discharge lamp driven apparatus comprises a power-switching circuit 30, a transforming circuit 31 and a light tube group 32.Wherein, transforming circuit 31 comprises one first transformer T
31, one second transformer T
32, one the 3rd transformer T
33And one the 4th transformer T
34, light tube group 32 correspondences comprise a plurality of fluorescent tube L
31, L
32, L
33, L
34
Each transformer includes an elementary winding and a level winding, and each elementary winding correspondence comprises a first input end a
3n(n=1,2,3,4) and one second input b
3n(n=1,2,3,4), each secondary winding correspondence comprises one first output c
3n(n=1,2,3,4) and one second output d
3n(n=1,2,3,4).In the present embodiment, described transformer T
3nThe first output c of (n=1,2,3,4) secondary winding
3n(n=1,2,3,4) are high-pressure side, described transformer T
3nThe second output d of (n=1,2,3,4) secondary winding
3n(n=1,2,3,4) are low-pressure end.
In the transforming circuit 31, the first transformer T
31The first input end a of elementary winding
31, the second transformer T
32The second input b of elementary winding
32, the 3rd transformer T
33The second input b of elementary winding
33And the 4th transformer T
34The first input end a of elementary winding
34Link to each other, and be connected to the cathode output end of power-switching circuit 30 jointly; The first transformer T
31The second input b of elementary winding
31, the second transformer T
32The first input end a of elementary winding
32, the 3rd transformer T
33The first input end a of elementary winding
33And the 4th transformer T
34The second input b of elementary winding
34Link to each other, and be connected to the cathode output end of power-switching circuit 30 jointly.Again, described transformer T
3nThe first output c of (n=1,2,3,4) secondary winding
3n(n=1,2,3,4) corresponding respectively fluorescent tube L that connects
3nOne end of (n=1,2,3,4), and described transformer T
3nThe second output d of (n=1,2,3,4) secondary winding
3n(n=1,2,3,4) are ground connection all.Fluorescent tube L
3nThe also equal ground connection of the other end of (n=1,2,3,4).
This shows, be loaded on fluorescent tube L
31With L
34Voltage swing, phase place all identical, and be forward voltage, be loaded on fluorescent tube L
32With L
33Voltage swing, phase place identical, and be negative voltage.
When driving a plurality of light tube group, the present invention also provides one to change example, consults Fig. 4 and is discharge lamp driven apparatus in the second embodiment of the invention.This discharge lamp driven apparatus comprises a power-switching circuit 40, a plurality of transforming circuit 41n (n=1,2,3 ...) and a plurality of light tube group 42n (n=1,2,3 ...).Wherein, transforming circuit 41n (n=1,2,3 ...) internal structure is identical with the internal structure of transforming circuit 31 among Fig. 3, and itself and light tube group 42n (n=1,2,3 ...) annexation and Fig. 3 transforming circuit 31 identical with the annexation of light tube group 32, do not repeat them here.As can be seen, comprise a plurality of transforming circuit 41n (n=1,2,3 when discharge lamp driven apparatus ...) and a plurality of light tube group 42n (n=1,2,3 ...) time, in the described transforming circuit, first is opposite with the output voltage polarity that last output voltage polarity is adjacent.In all the other voltage output polarities, identical in arbitrary output voltage polarity and its two output voltage polarity adjacent one another are, and opposite with another person in its two output voltage polarity adjacent one another are.In the present embodiment, first and last output voltage polarity are positive polarity, and in other execution mode of the present invention, first and last output voltage polarity also can be negative polarity.
Consult the discharge lamp driven apparatus of Fig. 5 for third embodiment of the invention.Discharge lamp driven apparatus and discharge lamp driven apparatus shown in Figure 3 are basic identical in the present embodiment, and difference is in the present embodiment that light tube group 52 comprises one first fluorescent tube L
51With one second fluorescent tube L
52, and described fluorescent tube is a U type fluorescent tube.Wherein, the first fluorescent tube L
51An end and the first transformer T
51The first output c of secondary winding
51Link to each other its other end and the second transformer L
52The first output c of secondary winding
52Link to each other; The second fluorescent tube L
52An end and the 3rd transformer T
53The first output c of secondary winding
53Link to each other its other end and the 4th transformer L
54The first output c of secondary winding
54Link to each other.
When discharge lamp driven apparatus need drive a plurality of U type fluorescent tube, provided by the invention another changed example, and it is identical with discharge lamp driven apparatus structure shown in Figure 4, does not repeat them here.
Fig. 6 is the discharge lamp driven apparatus of four embodiment of the invention.This drive unit comprise power-switching circuit 60 and 60 ', transforming circuit 61 and a 61 ' and light tube group 62.Wherein, annexation between power-switching circuit 60, transforming circuit 61, the light tube group 62 and power-switching circuit 60 ', transforming circuit 61 ', light tube group 62 ' between annexation and Fig. 3 in annexation between power-switching circuit 30, transforming circuit 31 and the light tube group 32 basic identical.Difference is that transforming circuit 61 ' correspondence comprises one the 5th transformer T
61', one the 6th transformer T
62', one the 7th transformer T
63' and one the 8th transformer T
64', and the 5th transformer T
61The first input end a of ' elementary winding
61' with power-switching circuit 60 ' cathode output end link to each other the second input b of its 8th primary winding
64' with power-switching circuit 60 ' cathode output end link to each other.
The present invention also provides another to change example, and Fig. 7 is the discharge lamp driven apparatus of fifth embodiment of the invention.This discharge lamp driven apparatus comprise power-switching circuit 70 and 70 ', a plurality of transforming circuit 71n (n=1,2,3 ...) and 71n ' (n=1,2,3 ...) and a plurality of light tube group 72n (n=1,2,3 ...).Wherein, described transforming circuit 71n (n=1,2,3 ...) and 71n ' (n=1,2,3 ...) transforming circuit 61 is identical with 61 ' internal structure among internal structure and Fig. 6, and itself and light tube group 72n (n=1,2,3 ...) annexation and Fig. 6 transforming circuit 61,61 ' identical with the annexation of light tube group 62, do not repeat them here.
Equally, when discharge lamp driven apparatus includes a plurality of transforming circuit, in the described transformer, first is opposite with the output voltage polarity that last output voltage polarity is adjacent, in all the other voltage output polarities, one identical in arbitrary output voltage polarity and its two output voltage polarity adjacent one another are, and opposite with another person in its two output voltage polarity adjacent one another are.In the present embodiment, in the transforming circuit 71, first and last output voltage polarity are positive polarity; Transforming circuit 71 ' in, first and last output voltage polarity are negative polarity.In other execution mode of the present invention, above-mentioned transforming circuit 71 and 71 ' in first and last polarity of voltage can also change, promptly in the transforming circuit 71, first and last output voltage polarity are negative polarity; Transforming circuit 71 ' in, first and last output voltage polarity are positive polarity.
In sum, in the discharge lamp driven apparatus of the present invention, transforming circuit output voltage polar arrangement mode each lamp current size that both can guarantee to flow through is basic identical, the voltage difference that can make some adjacent fluorescent tube again is zero, avoid arcing phenomenon generation between circuit, and distance between the shortening fluorescent tube, thereby reduce the area of circuit board, save cost.
Claims (16)
1. discharge lamp driven apparatus is used to drive a light tube group that comprises a plurality of fluorescent tubes, it is characterized in that described discharge lamp driven apparatus comprises:
One power-switching circuit, it has a cathode output end and a cathode output end; And
One transforming circuit, it links to each other with described power-switching circuit, comprising:
One first transformer;
One second transformer;
One the 3rd transformer; And
One the 4th transformer;
Wherein, each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input; Wherein, second input of second input of the first input end of the first primary winding, the second primary winding, the 3rd primary winding, the first input end of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly; And the first input end of second input of the first primary winding, the second primary winding, the first input end of the 3rd primary winding, second input of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.
2. discharge lamp driven apparatus as claimed in claim 1 it is characterized in that described transformer comprises the level winding respectively one time, and each secondary winding comprises one first output and one second output respectively.
3. discharge lamp driven apparatus as claimed in claim 2, first output that it is characterized in that described transformer secondary output winding is a high-pressure side, its second output is a low-pressure end.
4. discharge lamp driven apparatus as claimed in claim 2 is characterized in that the equal ground connection of second output of described transformer secondary output winding.
5. first output of corresponding transformer secondary output winding links to each other its other end ground connection in the discharge lamp driven apparatus as claimed in claim 4, an end that it is characterized in that described fluorescent tube and transforming circuit.
6. discharge lamp driven apparatus as claimed in claim 4, it is characterized in that described light tube group comprises one first fluorescent tube and one second fluorescent tube, wherein, one end of first fluorescent tube links to each other with first output of the first transformer secondary output winding, and its other end links to each other with first output of the second transformer secondary output winding; One end of second fluorescent tube links to each other with first output of the 3rd transformer secondary output winding, and its other end links to each other with first output of the 4th transformer secondary output winding.
7. discharge lamp driven apparatus as claimed in claim 4 is characterized in that comprising:
One another power-switching circuit, it has a cathode output end and a cathode output end; And
One another transforming circuit, it links to each other with another power-switching circuit, comprising:
One the 5th transformer;
One the 6th transformer;
One the 7th transformer; And
One the 8th transformer;
Wherein, each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input; Wherein, second input of second input of the first input end of the 5th primary winding, the 6th primary winding, the 7th primary winding, the first input end of the 8th primary winding link to each other, and are connected to the cathode output end of another power-switching circuit jointly; And the first input end of second input of the 5th primary winding, the 6th primary winding, the first input end of the 7th primary winding, second input of the 8th primary winding link to each other, and are connected to the cathode output end of another power-switching circuit jointly.
8. discharge lamp driven apparatus as claimed in claim 7 is characterized in that between first output of corresponding transformer secondary output winding in first output that described fluorescent tube is connected to corresponding transformer secondary output winding in the transforming circuit and another transforming circuit.
9. a discharge lamp driven apparatus is used to drive a plurality of light tube group, it is characterized in that described discharge lamp driven apparatus comprises:
One power-switching circuit, it has a cathode output end and a cathode output end; And
A plurality of transforming circuits, it links to each other with power-switching circuit, and each transforming circuit includes:
One first transformer;
One second transformer;
One the 3rd transformer; And
One the 4th transformer;
Wherein, each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input; Wherein, second input of second input of the first input end of the first primary winding, the second primary winding, the 3rd primary winding, the first input end of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly; And the first input end of second input of the first primary winding, the second primary winding, the first input end of the 3rd primary winding, second input of the 4th primary winding link to each other, and are connected to the cathode output end of power-switching circuit jointly.
10. discharge lamp driven apparatus as claimed in claim 9 it is characterized in that described transformer comprises the level winding respectively one time, and each secondary winding comprises one first output and one second output respectively.
11. discharge lamp driven apparatus as claimed in claim 10, first output that it is characterized in that described transformer secondary output winding is a high-pressure side, and its second output is a low-pressure end.
12. discharge lamp driven apparatus as claimed in claim 10 is characterized in that the equal ground connection of second output of described transformer secondary output winding.
13. first output of corresponding transformer secondary output winding links to each other its other end ground connection in the discharge lamp driven apparatus as claimed in claim 12, an end that it is characterized in that described fluorescent tube and transforming circuit.
14. discharge lamp driven apparatus as claimed in claim 12, it is characterized in that described light tube group comprises one first fluorescent tube and one second fluorescent tube, wherein, one end of first fluorescent tube links to each other with first output of the first transformer secondary output winding, and its other end links to each other with first output of the second transformer secondary output winding; One end of second fluorescent tube links to each other with first output of the 3rd transformer secondary output winding, and its other end links to each other with first output of the 4th transformer secondary output winding.
15. discharge lamp driven apparatus as claimed in claim 12 is characterized in that comprising:
One another power-switching circuit, it has a cathode output end and a cathode output end; And
A plurality of another transforming circuits, it links to each other with another power-switching circuit, comprising:
One the 5th transformer;
One the 6th transformer;
One the 7th transformer; And
One the 8th transformer;
Wherein, each transformer includes an elementary winding, and each elementary winding includes a first input end and one second input; Wherein, second input of second input of the first input end of the 5th primary winding, the 6th primary winding, the 7th primary winding, the first input end of the 8th primary winding link to each other, and are connected to the cathode output end of another power-switching circuit jointly; And the first input end of second input of the 5th primary winding, the 6th primary winding, the first input end of the 7th primary winding, second input of the 8th primary winding link to each other, and are connected to the cathode output end of another power-switching circuit jointly.
16. discharge lamp driven apparatus as claimed in claim 15 is characterized in that between first output of corresponding transformer secondary output winding in first output that described fluorescent tube is connected to corresponding transformer secondary output winding in the transforming circuit and another transforming circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101214174A CN1993008B (en) | 2005-12-30 | 2005-12-30 | Discharge lamp driving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101214174A CN1993008B (en) | 2005-12-30 | 2005-12-30 | Discharge lamp driving apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1993008A true CN1993008A (en) | 2007-07-04 |
| CN1993008B CN1993008B (en) | 2011-06-22 |
Family
ID=38214851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101214174A Expired - Fee Related CN1993008B (en) | 2005-12-30 | 2005-12-30 | Discharge lamp driving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1993008B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692953Y (en) * | 2002-05-27 | 2005-04-13 | 肖显望 | Microcomputer program-controlled illuminating device capable of turning on or off lamp nearby |
| JP2004335422A (en) * | 2003-05-12 | 2004-11-25 | Harison Toshiba Lighting Corp | Discharge lamp lighting device |
| CN100573264C (en) * | 2004-12-01 | 2009-12-23 | 友达光电股份有限公司 | Fluorescent tube module and backlight module |
-
2005
- 2005-12-30 CN CN2005101214174A patent/CN1993008B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1993008B (en) | 2011-06-22 |
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Granted publication date: 20110622 Termination date: 20121230 |