CN201112080Y

CN201112080Y - Transformer and light tube driving circuit using the same

Info

Publication number: CN201112080Y
Application number: CNU2007201556829U
Authority: CN
Inventors: 薛景福; 简政贤; 郑又诚
Original assignee: Darfon Electronics Corp
Current assignee: Darfon Electronics Corp
Priority date: 2007-08-02
Filing date: 2007-08-02
Publication date: 2008-09-10
Anticipated expiration: 2017-08-02

Abstract

The utility model discloses a transformer which comprises a magnetic core unit, a primary coil, a first secondary coil and at least one electroconductive elastic element. The magnetic core unit comprises a first magnetic core and a second magnetic core. A plurality of clearances exist between the first magnetic core and the second magnetic core. A first coil and a second coil are winded around the magnetic core unit. At least one electroconductive elastic element is arranged in at least one of the clearances. Therefore, the transformer of the utility model can effectively reduce self-vibration and the noise caused by sparkover.

Description

Transformer and use the lamp tube drive circuit of this transformer

Technical field

The utility model relates to a kind of transformer, particularly relates to a kind of transformer with electrically conductive elastic member.

Background technology

The fluorescent tube that the backlight liquid crystal display device is adopted is generally discharge lamp, and for example cold-cathode tube (CCFL) generally all needs transformer that voltage is raise and drive discharge lamp, utilizes high-tension coil (secondary coil) to remove to drive fluorescent tube.When the fluorescent tube length of LCD and quantity increased, the power output of transformer also will and then improve, and this moment, transformer had noise problem to produce easily.

The magnetic core set of transformer generally can be divided into two magnetic cores, and the plastic cement pad is inserted in the crack between two magnetic cores.Yet this practice mainly contains two shortcomings: when 1) transformer operated, two magnetic cores can produce vibration, and the plastic cement pad can't absorb vibration; When 2) transformer operates,, can produce arcing phenomenon (arc), and then produce noise if between two magnetic cores high potential difference is arranged.

Therefore, the utility model provides a kind of transformer with electrically conductive elastic member, in order to address the above problem.

The utility model content

A purpose of the present utility model is to provide a kind of transformer with electrically conductive elastic member.

The purpose of this utility model is achieved in that promptly provides a kind of transformer, and it comprises magnetic core set, primary coil, first secondary coil and at least one electrically conductive elastic member.Magnetic core set comprises first magnetic core and second magnetic core.A plurality of gaps are present between first magnetic core and second magnetic core.The primary coil and first secondary coil are wound in magnetic core set.At least one electrically conductive elastic member is configured at least in one of them of these a plurality of gaps.

Another category of the present utility model is to provide a kind of lamp tube drive circuit, comprises a magnetic core set, primary coil, first secondary coil, first fluorescent tube and at least one electrically conductive elastic member.Magnetic core set comprises first magnetic core and second magnetic core, a plurality of gaps are present between this first magnetic core and this second magnetic core, the primary coil and first secondary coil are wound in this magnetic core set, first fluorescent tube is coupled to first secondary coil, and the electrically conductive elastic member is configured at least in one of them of these a plurality of gaps.

Advantage of the present utility model is, its transformer utilizes the electrically conductive elastic member, with the vibration of absorption magnetic core set, and the potential difference between reduction magnetic core and the magnetic core, therefore, transformer of the present utility model can effectively reduce the noise problem that vibration and arcing produced of self.

Can be further understood by following utility model detailed description and appended accompanying drawing about advantage of the present utility model and spirit.

Description of drawings

Figure 1A is the schematic diagram according to the transformer of the utility model one preferred embodiment;

Figure 1B is the circuit diagram of transformer among Figure 1A;

Fig. 1 C is the circuit diagram of lamp tube drive circuit;

Fig. 2 A is the schematic diagram according to the transformer of another preferred embodiment of the utility model;

Fig. 2 B is the circuit diagram of transformer among Fig. 2 A;

Fig. 2 C is the circuit diagram of lamp tube drive circuit.

The main element symbol description

1,2: transformer 3,4: lamp tube drive circuit

10,20: magnetic core set 14,240: the first secondary coils

242: second subprime coil 12,22: primary coil

16,26: electrically conductive elastic member 100,200: the first magnetic cores

102,202: the second magnetic core L1, L2: discharge lamp

Embodiment

See also Figure 1A and Figure 1B, Figure 1A is the schematic diagram that illustrates according to the transformer 1 of the utility model one preferred embodiment.Figure 1B is the circuit diagram that illustrates transformer 1 among Figure 1A.Shown in Figure 1A and Figure 1B, transformer 1 comprises magnetic core set 10, primary coil 12, first secondary coil 14 and two electrically conductive elastic members 16.Be noted that the number of electrically conductive elastic member 16 can be adjusted according to practical application, and the thickness of electrically conductive elastic member 16 can adjust according to the specification demand.

Shown in Figure 1A, magnetic core set 10 comprises first magnetic core 100 and second magnetic core 102.A plurality of gaps are present between first magnetic core 100 and second magnetic core 102.The primary coil 12 and first secondary coil 14 are wound in magnetic core set 10.Shown in Figure 1A, primary coil 12 is wrapped on first magnetic core 100, and first secondary coil 14 is wrapped on second magnetic core 102.Two electrically conductive elastic members 16 are configured in respectively in the corresponding gap.In this embodiment, electrically conductive elastic member 16 can be the element of conductive rubber or other similar characteristics.In addition, in Figure 1A, simplify the sign of having omitted drum stand for asking, in fact drum stand is the outside that is positioned at first magnetic core 100 and second magnetic core 102, the primary coil 12 and first secondary coil 14 are actually and are wrapped on the drum stand, rather than directly are wrapped on the magnetic core set.

See also Fig. 1 C, Fig. 1 C is the circuit diagram that illustrates lamp tube drive circuit 3.Transformer 1 constitutes a lamp tube drive circuit 3 with discharge lamp L1, can be used as Backlight For Liquid Crystal Display Panels.When using this transformer 1 to drive discharge lamp L1, primary coil 12 is a low-voltage coil, couples a control unit (not shown).First secondary coil 14 is a high-tension coil, couples discharge lamp L1, and first secondary coil 14 can be responded to the high pressure more than 1000 volts usually.

See also Fig. 2 A and Fig. 2 B, Fig. 2 A is the schematic diagram that illustrates according to the transformer 2 of another preferred embodiment of the utility model.Fig. 2 B is the circuit diagram that illustrates transformer 2 among Fig. 2 A.Shown in Fig. 2 A and Figure 1A, transformer 2 is in profile and coil with transformer 1 main difference.The profile of first magnetic core 200 of

transformer

2 and 202 combinations of second magnetic core is the magnetic core set 20 of UU, and the profile of the magnetic core set 10 of transformer 1 is EE.In addition, the primary coil 22 of transformer 2 is wound in a side of magnetic core set, and first secondary coil 240 and second subprime coil 242 are wound in the opposite side of magnetic core set.In this embodiment, electrically conductive elastic member 26 can be conductive rubber or other likes.In addition, in Fig. 2 A, simplify the diagram of having omitted drum stand for asking, drum stand is positioned at the outside of first magnetic core 200 and second magnetic core 202, primary coil 20, first secondary coil 240 and second subprime coil 242 are actually and are wrapped on the drum stand, rather than directly are wrapped on the magnetic core set 20.

See also Fig. 2 C, Fig. 2 C is the circuit diagram that illustrates lamp tube drive circuit 4.Transformer 2 constitutes lamp tube drive circuit 4 with discharge lamp L1, L2, and primary coil 22 is a low-voltage coil, and first secondary coil 240 and second subprime coil 242 are high-tension coil, and couple discharge lamp L1, L2 respectively.

When practical application, first magnetic core and second magnetic core be also capable of being combined to become profiles such as EI, LL, UI, UT.

Be compared to prior art, transformer of the present utility model utilizes electrically conductive elastic member (as conductive rubber), with the vibration of absorption magnetic core set, and the potential difference between the reduction magnetic core set.Therefore, transformer of the present utility model can effectively reduce the noise problem that vibration and arcing produced of self.

Claims

1. a transformer is characterized in that, comprises: magnetic core set comprises first magnetic core and second magnetic core; A plurality of gaps are present between this first magnetic core and this second magnetic core; Primary coil is wound in this magnetic core set; First secondary coil is wound in this magnetic core set; And at least one electrically conductive elastic member, be configured at least in one of them of these a plurality of gaps.

2. transformer as claimed in claim 1 is characterized in that, a profile wherein of the synthetic following group of this first magnetic core and this second magnetic core set: EE, EI, UU, LL, UI and UT.

3. transformer as claimed in claim 1 is characterized in that, this electrically conductive elastic member is a conductive rubber.

4. transformer as claimed in claim 1 is characterized in that, more comprises the second subprime coil, and this second subprime coil is wound in this magnetic core set.

5. transformer as claimed in claim 4 is characterized in that, this first coil is wound in a side of this magnetic core set, and this first secondary coil and this second subprime coil are wound in the opposite side of this magnetic core set.

6. a lamp tube drive circuit is characterized in that, comprises: magnetic core set comprises first magnetic core and second magnetic core; A plurality of gaps are present between this first magnetic core and this second magnetic core; Primary coil is wound in this magnetic core set; First secondary coil is wound in this magnetic core set; First fluorescent tube couples this first secondary coil; And at least one electrically conductive elastic member, be configured at least in one of them of these a plurality of gaps.

7. lamp tube drive circuit as claimed in claim 6 is characterized in that, a profile wherein of the synthetic following group of this first magnetic core and this second magnetic core set: EE, EI, UU, LL, UI and UT.

8. lamp tube drive circuit as claimed in claim 6 is characterized in that, this electrically conductive elastic member is a conductive rubber.

9. lamp tube drive circuit as claimed in claim 6 is characterized in that, more comprises the second subprime coil and second fluorescent tube, and this second subprime coil is wound in this magnetic core set, and this second fluorescent tube couples this second subprime coil.

10. lamp tube drive circuit as claimed in claim 9 is characterized in that, this first coil is wound in a side of this magnetic core set, and this first secondary coil and this second subprime coil are wound in the opposite side of this magnetic core set.