CN1980509B - Multi-lamp-tube driving system - Google Patents
Multi-lamp-tube driving system Download PDFInfo
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- CN1980509B CN1980509B CN2005101020107A CN200510102010A CN1980509B CN 1980509 B CN1980509 B CN 1980509B CN 2005101020107 A CN2005101020107 A CN 2005101020107A CN 200510102010 A CN200510102010 A CN 200510102010A CN 1980509 B CN1980509 B CN 1980509B
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Abstract
This system consists of a transformer circuit (TC), a current balance circuit (CBC) and a lamp set. TC consists of N pieces of transformers. Each of them possesses the 1st and the 2nd secondary windings. The 1st secondary winding includes the 1st and the 2nd output ends. The 2nd secondary winding includes the 3rd and the 4th output ends. CBC consists of 2N pieces of current balance units (CBU). Each CBU has two output ends. The (2N)th CBU connects to the 4th output end of the (N)th transformer. The (2N-1)th CBU connects to the 1st output end of the (N)th transformer. The lamp set consists 4N pieces of lamps. One end of the lamp connects to the output end of CBU and the other end to ground. This multi-lamp driving system possesses small dimension and low cost.
Description
[technical field]
The present invention relates to a kind of lamp-tube driving system, relate in particular to a kind of LCD (Liquid Crystal Display, LCD) multi-lamp-tube driving system of backlight module (Backlight module) of being used for.
[background technology]
(Liquid Crystal Display, LCD) panel is that (Cold Cathode FluorescentLamp is CCFL) as the light source of (Backlight) backlight system with discharge lamp (Discharge Lamp), particularly cold-cathode fluorescence lamp in liquid crystal display.Typically, cold-cathode fluorescence lamp is to be driven by converter circuit (Inverter Circuit), and it can supply AC signal to fluorescent tube.In relatively large display panels, two or more cold-cathode fluorescence lamps need be set so that enough brightness to be provided.
Figure 1 shows that the functional block diagram of an existing multiple lamp tube drive circuit.Described system comprises a direct current power supply Vc, a converter circuit 100, a control circuit 110, a plurality of feedback circuit 120, a plurality of transformer T11, T12, T13, T14, a plurality of capacitor C 11, C12, C13, C14 and a plurality of fluorescent tube Lp11, Lp12, Lp13, Lp14.The direct current signal that converter circuit 100 is used for being received from DC power supply Vc is converted to AC signal.Control circuit 110 is used to control converter circuit 100 direct current signal that receives is converted to AC signal.Described feedback circuit 120 is respectively applied for from fluorescent tube Lp11, Lp12, Lp13, the Lp14 of correspondence and feeds back a current signal to control circuit 110.Described transformer T11, T12, T13, T14 are connected to described converter circuit 100, the corresponding end that connects described capacitor C 11, C12, C13, C14 of an end of its secondary coil, other end ground connection.The other end of capacitor C 11, C12, C13, C14 connects fluorescent tube Lp11, Lp12, Lp13, Lp14 respectively.
Above-mentioned multiple lamp tube drive circuit is by identical transformer T11, T12, T13, the T14 of selectivity characteristic, but equiulbrium flow is through the electric current of fluorescent tube Lp11, Lp12, Lp13, Lp14.Yet, drive a fluorescent tube because of it utilizes transformer, when the fluorescent tube number more for a long time, this multiple lamp tube drive circuit needs than multiple transformers, thereby volume is bigger, cost is higher.
[summary of the invention]
In view of this, need provide a kind of multi-lamp-tube driving system, its volume is less, and cost is lower.
A kind of multi-lamp-tube driving system comprises a converter circuit, a control circuit, a feedback circuit, a transformer circuit, a current balance circuit and a light tube group.The direct current signal that converter circuit is used for being received from DC power supply is converted to AC signal.Control circuit is used to control described converter circuit the direct current signal that receives is converted to AC signal.Transformer circuit links to each other with described converter circuit, is used to change the voltage level of described AC signal, and it comprises N transformer, and each transformer comprises one first secondary coil and a second subprime coil.Wherein, first secondary coil comprises one first output and second output, and the second subprime coil comprises one the 3rd output and the 4th output.Current balance circuit comprises 2N current balancing unit, wherein 2N current balancing unit is connected to the 4th output of N transformer, 2N-1 current balancing unit is connected to first output of N transformer, and each current balancing unit comprises two outputs.Light tube group comprises 4N fluorescent tube, and an end of described fluorescent tube connects one to one to the output of described current balancing unit other end ground connection.Feedback circuit links to each other with described transformer circuit, is used to feed back a current signal to described control circuit.
A kind of multi-lamp-tube driving system comprises a converter circuit, a control circuit, a feedback circuit, a transformer circuit, a current balance circuit and a light tube group.The direct current signal that converter circuit is used for being received from DC power supply is converted to AC signal.Control circuit is used to control described converter circuit the direct current signal that receives is converted to AC signal.Transformer circuit links to each other with described converter circuit, is used to change the voltage level of described AC signal, and it comprises N transformer, and wherein each transformer comprises one first secondary coil, a second subprime coil and level coil for the third time.Wherein, first secondary coil comprises one first output and second output, and the second subprime coil comprises one the 3rd output and the 4th output, and the level coil comprises one the 5th output and the 6th output for the third time.Current balance circuit comprises 3N current balancing unit, wherein 3N current balancing unit is connected to the 5th output of N transformer, 3N-1 current balancing unit is connected to the 3rd output of N transformer, 3N-2 current balancing unit is connected to first output of N transformer, and wherein each current balancing unit comprises two outputs.Light tube group comprises 6N fluorescent tube, and an end of described fluorescent tube connects one to one to the output of described current balancing unit other end ground connection.Feedback circuit links to each other with described transformer circuit, is used to feed back a current signal to described control circuit.
But above-mentioned multi-lamp-tube driving system equiulbrium flow reaches and can drive 4N or 6N fluorescent tube with N transformer, thereby volume is less through a plurality of lamp tube current, and cost is lower.
[description of drawings]
Fig. 1 is the functional block diagram of an existing multi-lamp-tube driving system.
Fig. 2 is the module map of multi-lamp-tube driving system in one embodiment of the invention.
Fig. 3 is the physical circuit figure of multi-lamp-tube driving system in one embodiment of the invention.
Fig. 4 is the physical circuit figure of multi-lamp-tube driving system in another embodiment of the present invention.
Fig. 5 is the physical circuit figure of multi-lamp-tube driving system in further embodiment of this invention.
Fig. 6 is the physical circuit figure of multi-lamp-tube driving system in yet another embodiment of the invention.
[embodiment]
Seeing also Fig. 2, is the functional block diagram for multi-lamp-tube driving system in one embodiment of the invention.In the present embodiment, multi-lamp-tube driving system comprises: a direct current power supply Vc, a converter circuit 200, a control circuit 210, a feedback circuit 220, a transformer circuit 230, a current balance circuit 240 and a light tube group 250, wherein light tube group 250 comprises a plurality of fluorescent tubes, and described multi-lamp-tube driving system is a plurality of fluorescent tubes that are used to drive light tube group 250.The direct current signal that converter circuit 200 is used for being received from DC power supply Vc is converted to AC signal.In the circuit of reality, converter circuit 200 can be a semibridge system (Half-bridge) converter circuit, a full-bridge type (Full-bridge) converter circuit or a push-pull type (Push-pull) converter circuit etc.Control circuit 210 is used to control converter circuit 200, promptly controls the direct current signal that converter circuit 200 will be received from DC power supply Vc and is converted to AC signal.Transformer circuit 230 is coupled to converter circuit 200, is used to change the voltage level of AC signal, to provide light tube group 250 required power supply.Current balancing unit 240 is coupled between transformer circuit 230 and the light tube group 250, is used for equiulbrium flow each lamp tube current through light tube group 250.Feedback circuit 220 is coupled to described transformer circuit 230 and control circuit 210, is used to feed back a current signal to control circuit 210.
Figure 3 shows that the physical circuit figure among the embodiment of multi-lamp-tube driving system of Fig. 2.In the present embodiment, light tube group 250a comprises four fluorescent tube Lp31, Lp32, Lp33, Lp34.Transformer circuit 230a comprises a transformer T31, and transformer T31 comprises a primary coil, one first secondary coil and a second subprime coil.The primary coil of transformer T31 is connected to converter circuit 200, the first secondary coils and comprises one first output and one second output, and the second subprime coil comprises one the 3rd output and one the 4th output.In the present embodiment, first secondary coil is identical with the number of turn of second subprime coil.
Current balancing unit CT31, CT32 are identical, and include two magnetic element coils, and these two magnetic element coil turns are identical.In the present embodiment, current balancing unit CT31, CT32 are common mode choke.
Because of first secondary coil of transformer T31 identical with the number of turn of second subprime coil, first secondary coil is identical with the electric current of second subprime coil so flow through, coil turn because of current balancing unit CT31, CT32 is all identical again, the electric current of the magnetic element coil of current balancing unit CT31, CT32 is identical so flow through, thereby each fluorescent tube Lp31, Lp32 of the light tube group of flowing through 250a, the electric current of Lp33, Lp34 are identical.
In the present embodiment, multi-lamp-tube driving system utilizes a transformer T31 and two current balancing unit to drive four fluorescent tube Lp31, Lp32, Lp33, Lp34, and volume is less, and cost reduces.
Figure 4 shows that the physical circuit figure among another embodiment of multi-lamp-tube driving system of Fig. 2.In the present embodiment, multi-lamp-tube driving system need drive more fluorescent tubes, promptly light tube group 250b comprise a plurality of fluorescent tube Lp41, Lp42 ..., Lp4 (4N).Transformer circuit 230b comprise a plurality of identical transformer T41, T42 ..., T4N, described transformer T41, T42 ..., T4N comprises a primary coil, one first secondary coil and a second subprime coil respectively.Described transformer T41, T42 ..., T4N is connected in parallel to converter circuit 200, promptly described transformer T41, T42 ..., the parallel connection of primary windings of T4N.In other embodiments of the invention, described transformer T41, T42 ..., T4N also can be connected to converter circuit 200.Described transformer T41, T42 ..., first secondary coil of T4N comprises one first output and one second output respectively, the second subprime coil comprises one the 3rd output and one the 4th output respectively.In the present embodiment, described first secondary coil is identical with the number of turn of described second subprime coil.
Feedback circuit 220b comprise a plurality of feedback units 421,422 ..., 42N, and described feedback unit 421,422 ..., 42N is respectively applied for the feedback current signal to control circuit 210.
Current balance circuit 240b comprise a plurality of current balancing unit CT41, CT42 ..., CT4 (2N), wherein current balancing unit CT42 is connected to the 4th output of transformer T41, current balancing unit CT41 is connected to first output of transformer T41, and second output of transformer T41 and the 3rd output link to each other and also be connected to the feedback unit 421 of feedback circuit 220b jointly; Current balancing unit CT44 is connected to the 4th output of transformer T42, current balancing unit CT43 is connected to first output of transformer T42, and second output of transformer T42 and the 3rd output link to each other and also be connected to the feedback unit 422 of feedback circuit 220b jointly; By that analogy, current balancing unit CT4 (2N) is connected to the 4th output of transformer T4N, current balancing unit CT4 (2N-1) is connected to first output of transformer T4N, and second output of transformer T4N and the 3rd output link to each other and also be connected to the feedback unit 42N of feedback circuit 220b jointly.
Described current balancing unit CT41, CT42 ..., CT4 (2N) comprises two inputs and two outputs respectively, and each current balancing unit CT41, CT42 ..., two inputs of CT4 (2N) link to each other.One end of the fluorescent tube of light tube group 250b connect one to one described current balancing unit CT41, CT42 ..., the output of CT4 (2N), it is the output that fluorescent tube Lp41 one end is connected to current balancing unit CT41, fluorescent tube Lp42 one end is connected to another output of current balancing unit CT41, fluorescent tube Lp43 one end is connected to the output of current balancing unit CT42, and fluorescent tube Lp44 one end is connected to another output of current balancing unit CT42; By that analogy, fluorescent tube Lp4 (4N-3) end is connected to the output of current balancing unit CT4 (2N-1), fluorescent tube Lp4 (4N-2) end is connected to another output of current balancing unit CT4 (2N-1), fluorescent tube Lp4 (4N-1) end is connected to the output of current balancing unit CT4 (2N), fluorescent tube Lp4 (4N) end is connected to another output of current balancing unit CT4 (2N), and described fluorescent tube Lp41, Lp42 ..., the equal ground connection of the other end of Lp4 (4N).
Current balancing unit CT41, CT42 ..., CT4 (2N) is all identical, and includes two magnetic element coils, and these two magnetic element coil turns are identical.In the present embodiment, current balancing unit CT41, CT42 ..., CT4 (2N) is common mode choke.
Because of described transformer T41, T42 ..., T4N is identical, and its first secondary coil is identical with the number of turn of second subprime coil, so flow through described transformer T41, T42 ..., first secondary coil of T4N is identical with the electric current of second subprime coil, again because of current balancing unit CT41, CT42 ..., the coil turn of CT4 (2N) is all identical, so flow through current balancing unit CT41, CT42 ..., the electric current of the magnetic element coil of CT4 (2N) is identical, thereby, each fluorescent tube Lp41, Lp42 of the light tube group of flowing through 250b ..., the electric current of Lp4 (4N) is identical.
Figure 5 shows that the physical circuit figure among the another embodiment of multi-lamp-tube driving system of Fig. 2.In the present embodiment, light tube group 250c comprises six fluorescent tube Lp51, Lp52, Lp53, Lp54, Lp55, Lp56.Transformer circuit 230c comprises a transformer T51, and transformer T31 comprises a primary coil, one first secondary coil, a second subprime coil and level coil for the third time.The primary coil of transformer T51 is connected to converter circuit 200, first secondary coil comprises one first output and one second output, the second subprime coil comprises one the 3rd output and one the 4th output, and the level coil comprises one the 5th output and one the 6th output for the third time.In the present embodiment, first secondary coil, second subprime coil are identical with the number of turn of level coil for the third time.
Feedback circuit 220c comprises three feedback units 521,522,523, is respectively applied for the feedback current signal to control circuit 210.
Current balance circuit 240c comprises three current balancing unit CT51, CT52, CT53, wherein current balancing unit CT51 is connected to first output of transformer T51, current balancing unit CT52 is connected to the 3rd output of transformer T51, current balancing unit CT53 is connected to the 5th output of transformer T51, and second output of transformer T51, the 4th output and the 6th output are connected to the feedback unit 521,522,523 of feedback circuit 220c respectively.In other embodiments of the invention, current balancing unit CT51, CT52, CT53 also can be connected to second output, the 4th output and the 6th output of transformer T51 respectively.Current balancing unit CT51, CT52, CT53 comprise two inputs and two outputs respectively.Two inputs of current balancing unit CT51 link to each other, and are connected to first output of transformer T51.Two inputs of current balancing unit CT52 link to each other, and are connected to the 3rd output of transformer T51.Two inputs of current balancing unit CT53 link to each other, and are connected to the 5th output of transformer T51.Current balancing unit CT51, CT52, the output of CT53 connects the fluorescent tube of light tube group 250c respectively, it is the output that fluorescent tube Lp51 one end is connected to current balancing unit CT51, fluorescent tube Lp52 one end is connected to another output of current balancing unit CT51, fluorescent tube Lp53 one end is connected to the output of current balancing unit CT52, fluorescent tube Lp54 one end is connected to another output of current balancing unit CT52, fluorescent tube Lp55 one end is connected to the output of current balancing unit CT53, fluorescent tube Lp56 one end is connected to another output of current balancing unit CT53, and described fluorescent tube Lp51, Lp52, Lp53, Lp54, Lp55, the equal ground connection of the other end of Lp56.
Current balancing unit CT51, CT52, CT53 are identical, and include two magnetic element coils, and these two magnetic element coil turns are identical.In the present embodiment, current balancing unit CT51, CT52, CT53 are common mode choke.
Because of first secondary coil of transformer T51, second subprime coil, the number of turn of level coil is identical for the third time, so flow through first secondary coil, second subprime coil, the electric current of level coil is identical for the third time, coil turn because of current balancing unit CT51, CT52, CT53 is all identical again, the electric current of the magnetic element coil of current balancing unit CT51, CT52, CT53 is identical so flow through, thereby the electric current of each fluorescent tube Lp51, Lp52 of the light tube group of flowing through 250c, Lp53, Lp54, Lp55, Lp56 is identical.
In the present embodiment, multi-lamp-tube driving system utilizes a transformer T51 and three current balancing unit CT51, CT52, CT53 to drive six fluorescent tube Lp51, Lp52, Lp53, Lp54, Lp55, Lp56, and volume is less, and cost reduces.
Figure 6 shows that the physical circuit figure among the embodiment again of multi-lamp-tube driving system of Fig. 2.In the present embodiment, multi-lamp-tube driving system need drive more fluorescent tubes, promptly light tube group 250d comprise a plurality of fluorescent tube Lp61, Lp62 ..., Lp6 (6N).Transformer circuit 230d comprise a plurality of identical transformer T61, T62 ..., T6N, described transformer T61, T62 ..., T6N comprise respectively a primary coil, one first secondary coil, a second subprime coil and for the third time the level coil.Described transformer T61, T62 ..., T6N is connected in parallel to converter circuit 200, promptly described transformer T61, T62 ..., the parallel connection of primary windings of T6N.In other embodiments of the invention, described transformer T61, T62 ..., T6N also can be connected to converter circuit 200.Described transformer T61, T62 ..., first secondary coil of T6N comprises one first output and one second output respectively, the second subprime coil comprises one the 3rd output and one the 4th output respectively, and the level coil comprises one the 5th output and one the 6th output respectively for the third time.In the present embodiment, the number of turn of described first secondary coil, described second subprime coil, the described coil of level for the third time is identical.
Feedback circuit 220d comprise a plurality of feedback units 621,622 ..., 62 (3N), and described feedback unit 621,622 ..., 62 (3N) are respectively applied for the feedback current signal to control circuit 210.
Current balance circuit 240d comprise a plurality of current balancing unit CT61, CT62 ..., CT6 (3N), wherein current balancing unit CT61 is connected to first output of transformer T61, current balancing unit CT62 is connected to the 3rd output of transformer T61, current balancing unit CT63 is connected to the 5th output of transformer T61, and second output of transformer T61, the 4th output, the 6th output are connected to the feedback unit 621,622,623 of feedback circuit 220d respectively; Current balancing unit CT64 is connected to first output of transformer T62, current balancing unit CT65 is connected to the 3rd output of transformer T62, current balancing unit CT66 is connected to the 5th output of transformer T62, and second output of transformer T62, the 4th output, the 6th output are connected to the feedback unit 624,625,626 of feedback circuit 220d respectively; By that analogy, current balancing unit CT6 (3N-2) is connected to first output of transformer T6N, current balancing unit CT6 (3N-1) is connected to the 3rd output of transformer T6N, current balancing unit CT6 (3N) is connected to the 5th output of transformer T6N, and second output of transformer T6N, the 4th output, the 6th output are connected to feedback unit 62 (3N-2), 62 (3N-1), 62 (3N) of feedback circuit 220d respectively.
Described current balancing unit CT61, CT62 ..., CT6 (3N) comprises two inputs and two outputs respectively, and each current balancing unit CT61, CT62 ..., two inputs of CT6 (3N) link to each other.One end of the fluorescent tube of the light tube group 250d described current balancing unit CT61 that connects one to one, CT62, ..., the output of CT6 (3N), it is the output that fluorescent tube Lp61 one end is connected to current balancing unit CT61, fluorescent tube Lp62 one end is connected to another output of current balancing unit CT61, fluorescent tube Lp63 one end is connected to the output of current balancing unit CT62, fluorescent tube Lp64 one end is connected to another output of current balancing unit CT62, fluorescent tube Lp65 one end is connected to the output of current balancing unit CT63, and fluorescent tube Lp66 one end is connected to another output of current balancing unit CT63; By that analogy, fluorescent tube Lp6 (6N-5) end is connected to the output of current balancing unit CT6 (3N-2), fluorescent tube Lp6 (6N-4) end is connected to another output of current balancing unit CT6 (3N-2), fluorescent tube Lp6 (6N-3) end is connected to the output of current balancing unit CT6 (3N-1), fluorescent tube Lp6 (6N-2) end is connected to another output of current balancing unit CT6 (3N-1), fluorescent tube Lp6 (6N-1) end is connected to the output of current balancing unit CT6 (3N), fluorescent tube Lp6 (6N) end is connected to another output of current balancing unit CT6 (3N), and described fluorescent tube Lp61, Lp62, ..., the equal ground connection of the other end of Lp6 (6N).
Current balancing unit CT61, CT62 ..., CT6 (3N) is all identical, and includes two magnetic element coils, and these two magnetic element coil turns are identical.In the present embodiment, current balancing unit CT61, CT62 ..., CT6 (3N) is common mode choke.
Because of described transformer T61, T62, ..., T6N is identical, and its first secondary coil, the second subprime coil, the number of turn of level coil is identical for the third time, the described transformer T61 so flow through, T62, ..., first secondary coil of T6N, the second subprime coil, the electric current of level coil is identical for the third time, again because of current balancing unit CT61, CT62, ..., the coil turn of CT6 (3N) is all identical, the current balancing unit CT61 so flow through, CT62, ..., the electric current of the magnetic element coil of CT6 (3N) is identical, thereby, each fluorescent tube Lp61 of the light tube group of flowing through 250d, Lp62, ..., the electric current of Lp6 (6N) is identical.
Utilize multi-lamp-tube driving system of the present invention, but equiulbrium flow through each lamp tube current, and entire circuit framework size is less, cost is lower.
Claims (15)
1. a multi-lamp-tube driving system is used to drive a plurality of fluorescent tubes, it is characterized in that described multi-lamp-tube driving system comprises:
One converter circuit, the direct current signal that is used for being received from DC power supply is converted to AC signal;
One control circuit is used to control described converter circuit the direct current signal that receives is converted to AC signal;
One transformer circuit links to each other with described converter circuit, is used to change the voltage level of described AC signal, and it comprises N transformer, and wherein each transformer comprises:
One first secondary coil, it comprises one first output and one second output; And
One second subprime coil, it comprises one the 3rd output and one the 4th output;
One current balance circuit, comprise 2N current balancing unit, wherein 2N current balancing unit is connected to the 4th output of N transformer, and 2N-1 current balancing unit is connected to first output of N transformer, and wherein each current balancing unit comprises two outputs;
One light tube group comprises 4N fluorescent tube, and an end of described fluorescent tube connects one to one to the output of described current balancing unit other end ground connection; And
One feedback circuit links to each other with described transformer circuit, is used to feed back a current signal to described control circuit.
2. multi-lamp-tube driving system as claimed in claim 1 is characterized in that described first secondary coil is identical with described second subprime coil turn.
3. multi-lamp-tube driving system as claimed in claim 2 is characterized in that second output of described each transformer and the 3rd output are connected to feedback circuit jointly.
4. multi-lamp-tube driving system as claimed in claim 3 it is characterized in that described feedback circuit comprises N feedback unit, and each feedback unit is connected to second output of a transformer.
5. multi-lamp-tube driving system as claimed in claim 4 it is characterized in that described each current balancing unit comprises two inputs, and described two inputs joins.
6. multi-lamp-tube driving system as claimed in claim 5 is characterized in that described each current balancing unit comprises two magnetic element coils.
7. multi-lamp-tube driving system as claimed in claim 6 is characterized in that the number of turn of described two magnetic element coils is identical.
8. multi-lamp-tube driving system as claimed in claim 1 is characterized in that described current balancing unit is a common mode choke.
9. a multi-lamp-tube driving system is used to drive a plurality of fluorescent tubes, it is characterized in that described multi-lamp-tube driving system comprises:
One converter circuit, the direct current signal that is used for being received from DC power supply is converted to AC signal;
One control circuit is used to control described converter circuit the direct current signal that receives is converted to AC signal;
One transformer circuit links to each other with described converter circuit, is used to change the voltage level of described AC signal, and it comprises N transformer, and wherein each transformer comprises:
One first secondary coil, it comprises one first output and one second output;
One second subprime coil, it comprises one the 3rd output and one the 4th output; And
One for the third time the level coil, it comprises one the 5th output and one the 6th output;
One current balance circuit, comprise 3N current balancing unit, wherein 3N current balancing unit is connected to the 5th output of N transformer, 3N-1 current balancing unit is connected to the 3rd output of N transformer, 3N-2 current balancing unit is connected to first output of N transformer, and wherein each current balancing unit comprises two outputs;
One light tube group comprises 6N fluorescent tube, and an end of described fluorescent tube connects one to one to described current balancing unit output, other end ground connection; And
One feedback circuit links to each other with described transformer circuit, is used to feed back a current signal to described control circuit.
10. multi-lamp-tube driving system as claimed in claim 9 is characterized in that described first secondary coil, second subprime coil and the number of turn of level coil is identical for the third time.
11. multi-lamp-tube driving system as claimed in claim 10 it is characterized in that described feedback circuit comprises 3N feedback unit, and described feedback unit is connected to the second, the 4th and the 6th output of described transformer respectively.
12. multi-lamp-tube driving system as claimed in claim 9 it is characterized in that described each current balancing unit comprises two inputs, and described two inputs is connected.
13. multi-lamp-tube driving system as claimed in claim 12 is characterized in that described each current balancing unit comprises two magnetic element coils.
14. multi-lamp-tube driving system as claimed in claim 13 is characterized in that described two magnetic element coil turns are identical.
15. multi-lamp-tube driving system as claimed in claim 9 is characterized in that described current balancing unit is a common mode choke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101020107A CN1980509B (en) | 2005-12-02 | 2005-12-02 | Multi-lamp-tube driving system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101020107A CN1980509B (en) | 2005-12-02 | 2005-12-02 | Multi-lamp-tube driving system |
Publications (2)
| Publication Number | Publication Date |
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| CN1980509A CN1980509A (en) | 2007-06-13 |
| CN1980509B true CN1980509B (en) | 2010-04-21 |
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| CN2005101020107A Expired - Fee Related CN1980509B (en) | 2005-12-02 | 2005-12-02 | Multi-lamp-tube driving system |
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| CN101959345B (en) * | 2009-07-13 | 2014-10-29 | 台达电子工业股份有限公司 | Current balanced power supply circuit of multiple groups of direct current (DC) loads |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6781325B2 (en) * | 2002-04-12 | 2004-08-24 | O2Micro International Limited | Circuit structure for driving a plurality of cold cathode fluorescent lamps |
| CN1551704A (en) * | 2003-02-10 | 2004-12-01 | 牛岛昌和 | Nverter circuit for discharge lamps for multi-lamp lighting and surface light source system |
| CN1578580A (en) * | 2003-07-30 | 2005-02-09 | 松下电器产业株式会社 | Cold cathode fluorescent lamp driver circuit |
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2005
- 2005-12-02 CN CN2005101020107A patent/CN1980509B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6781325B2 (en) * | 2002-04-12 | 2004-08-24 | O2Micro International Limited | Circuit structure for driving a plurality of cold cathode fluorescent lamps |
| CN1551704A (en) * | 2003-02-10 | 2004-12-01 | 牛岛昌和 | Nverter circuit for discharge lamps for multi-lamp lighting and surface light source system |
| CN1578580A (en) * | 2003-07-30 | 2005-02-09 | 松下电器产业株式会社 | Cold cathode fluorescent lamp driver circuit |
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| CN1980509A (en) | 2007-06-13 |
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