CN2254232Y - Transformer for picture tube of display - Google Patents

Abstract

The utility model relates to a transformer structure for a display kinescope. A single insulation bobbin is used to replace the combined function of a primary bobbin and a secondary bobbin in a traditional transformer. The utility model comprises a casing, a bobbin rack body and the spool thereof, an iron core and coils. The coils comprise the primary coil wound on the surface of the spool, an insulation film layer which is wound and coated on the outer layer surface of the primary coil, and the secondary coil wound on the outermost layer of the insulation film. The magnetic coupling degree and the magnetic leakage between the primary and the secondary coils can be effectively controlled by regulating the coil number of the insulation film between the primary and the secondary coils to be matched with the display kinescopes having different specifications. Accordingly, the structure is simplified, the assemblage is simplified, and the cost is reduced.

Description

The transformer of display picture tube

The utility model relates to a kind of transformer, relates to the transformer of display picture tube or rather.

The application of display (CRT) is very widely, as color television set, high-resolution computer display and the display that is used for the super-resolution of medical science, all uses picture tube.The electron gun structure of tradition picture tube 1 as shown in Figure 1, mainly comprise the negative electrode 3 that can produce three-color electron beam, be used for producing electronics along the direction of the control utmost point 4, the control utmost point 4 also makes up with a screen board 5, in electron gun 2, form an electron beam forming area, make the electronics along continuous straight runs that has energy form the three-color electron beam of linear array.Electron gun 2 also includes parts such as focusing electrode 6 and anode 7, forms a high pressure condenser lens behind the above-mentioned unit construction, electron beam is focused on the fluorescence coating 9 of picture tube display screen 8.Fluorescence coating 9 forms the video signal image on display screen 8 according to electron beam sensitization.

This picture tube all needs to produce high voltage by a transformer (relaxation is returned transformer), and provide operate as normal required anode high voltage to picture tube through anode button 10, therefore transformer is the requisite vitals of display picture tube operate as normal, the voltage range that transformer provided can be by ten thousand volts of thousands of volts to 3 by its type, application mode or demand etc.

Shown in Figure 2 is the parts decomposition texture schematic diagram of traditional picture tube transformer, comprise a housing 11, be provided with an accommodation space 12 in the housing, support body 40 and on high-voltage capacitance 43, primary coil 410 (can referring to Fig. 3), secondary coil 411 and other rectifier cells 42 of being installed etc. just can be placed in this housing 11.Groove 13 is established in appropriate position in housing 11 lateral margins, just can embed one in this groove 13 and adjust button 20, treat that all elements are all packed in the accommodation space 12 of housing after, give the sealing location again.But 44 set on the support body 40 of terminals must expose outside, to be connected with related circuit.One group of U sections heart 30,31 is sheathed in the through hole 45 of support body 40, fixing with fastener 32, and unshakable in one's determination just through central authorities' formation magnetic circuit of coil, the high voltage that transformer secondary output coil 411 is produced is exported to the anode button of picture tube 1 by cable in the high pressure delivery outlet 14 of housing 11 bottoms.

Shown in Figure 3 is the generalized section of traditional picture tube transformer coil structure, and this coil mainly comprises a primary coil 410, level coil 411, rectifier cell 42 and a roll etc.Wherein primary coil 410 and secondary coil 411 are wrapped in respectively on the secondary bobbin 511 of the elementary bobbin 510 of hollow and hollow, elementary bobbin 510 after the coiling places the central through hole 513 of secondary bobbin 511, treat again one group of U sections heart 30,31 to be sheathed on after secondary coil assembling is finished in the central through hole 512 of elementary bobbin 510 and and fix, iron core is picked up through coil central authorities form magnetic circuit with fastener.

The function of coil be will about 125V in the variation of the magnetic line of force direct voltage be upgraded to about 25000 volts anode high voltage, if primary coil 410 has 62 circles, the secondary coil 411 concentric winding that is of five storeys approximately then, every layer of winding 328 circle are connected with rectifier diode 42 again.Consider that from the safety factor aspect this transformer coil must maintain enough apart from d at its primary coil 410 and 411 of secondary coils, as shown in Figure 3, the magnetic coupling (commissure) that has therefore reduced between primary and secondary coil is spent.Magnetic coupling degree value M represents the total degree between primary coil and secondary coil, and the magnetic coupling degree is that primary coil or secondary coil are different because of the magnetic force line source, the utility model then get secondary coil be the magnetic force line source and with primary coil as the side of being coupled.

By the magnetic line of force analysis that its secondary coil 411 is produced, the magnetic line of force 90 via unshakable in one's determination 30,31 is because whole 62 circle lines by primary coil 410, and can be described as complete commissure, only 91 of the magnetic lines of force by the primary coil 410 part numbers of turn are called the part commissure, and those just are not called not commissure by the magnetic line of force 92 of primary coil 410.Therefore the magnetic coupling degree value M perseverance between primary and secondary coil is less than 1, the part of its less than 1 by the part commissure and not two kinds of magnetic lines of force 91,92 of commissure cause, be referred to as leakage field L.Because leakage field L ' becomes formally with square value apart from d, thus leakage field L ' between primary and secondary coil apart from the variation of d sensitivity very, leakage field L ' increases with the parabola radian rapidly when d increases a little.

Referring to Fig. 4, because secondary coil 411 is to be made of 5 layers of concentric independent winding, one deck 328 wire turns are equably on another layer line circle, with unavoidable real estate cloth capacitor C estranged ', the electronic switch K that Fig. 5 is illustrated in picture tube just is in when sweeping the phase (promptly switching on the phase) TS, the primary coil 410 of transformer receives about 125V direct voltage and is temporary in the primary coil 410 with magnetic line of force form, primary coil 411 will be responded to 661 volts of voltages of generation and be applied on the distributed capacitance C ' simultaneously, press Fig. 6 or waveform shown in Figure 7 charges to C ', the energy of being assembled is C ' Vc ' 2/2, this moment is because the cathode potential of rectifier 42 is about 5KV, and anode potential has only 661 volts, so rectifier 42 can't have output.

Otherwise when picture tube electronic switch K is in flyback time during (turnoff time) Tr, this secondary coil 411 makes rectifier 42 conductings because of sensing enough voltage, this moment major part be stored in the energy of primary coil 410 will be via rectifier 42 outputs.Energy among the distributed capacitance C ' will form vibration with leakage field L ', period T=2 π (L ' C ') ^1/2Shown in Figure 7 is a kind of optimal situation, and in moment stray voltage Vc '=0 that electronic switch K connects, the energy among the distributed capacitance C ' can be exported fully at this moment.

If waveform as shown in Figure 7, connect moment at electronic switch K, energy among the distributed capacitance C ' is non-vanishing, then C ' and L ' will continue vibration during TS, producing the noise voltage Vc ' among Fig. 7, through 411 commissure capacitor C that form naturally of primary coil 410 and secondary coil ' PS (as shown in Figure 4) is added on the power supply, and industry is made by power supply and other circuit and produces banded vertically black interference 80 on the picture tube picture 8, as shown in Figure 8, influence the video signal quality.

In addition, the leakage field energy also will consume in iron core, coil and other insulating material, not only reduce energy efficiency but also make the transformer heating, make its life-span by 10 ^{-0.1 Δ t}Successively decrease (Δ t is an ascending temperature).Therefore, leakage field is satisfying under the requirement shown in Figure 7, should reduce as far as possible between primary and secondary coil apart from the d value.But existing secondary bobbin is made by the plastics one-shot forming, it is 0.8mm that forming technique has limited minimum distance value, and requirement because of the different size transformer, need design and produce multiple secondary bobbin cooperates with elementary bobbin, make the d value keep certain elasticity, not only production process complexity but also cost are high.

In sum, leakage field is directly connected to the electrical characteristic of picture tube, as resonance, efficient, amount of radiation and surging etc., therefore traditional picture tube transformer is only influenced by its loop construction and can correspondingly one by one be suitable for custom-designed picture tube, be difficult to by adjust the transformer upper-part as before, the secondary coil number of turn waits the picture tube that extensively cooperates all size.

The purpose of this utility model is to improve design at the problems in the above-mentioned picture tube transformer device structure design, the compound action that can replace elementary bobbin and secondary bobbin in the transformer by a single insulating bobbin, primary coil and secondary coil are wrapped on the same bobbin, with dielectric film at interval, can effectively control magnetic coupling degree and leakage field problem between primary and secondary coil by the winding number of turns of adjusting dielectric film between the two.

The transformer of the utility model display picture tube comprises the housing that is provided with accommodation space and is contained in accommodation space interior coil, iron core and bobbin, it is characterized in that:

Described bobbin is made of bobbin support body and the roll that is arranged on the bobbin support body, and the roll center is provided with the through hole that runs through the bobbin support body, and described iron core is set in the through hole;

Described coil comprise be wrapped in the lip-deep primary coil of roll, around overlaying on the dielectric film ring layer on the primary coil superficies and being wrapped in secondary coil on the dielectric film ring layer outermost surface.

Described roll surface is provided with the space and the floor of projection radially, forms winding slot between floor, and described primary coil is wrapped in the winding slot in regular turn.

The symmetry extension vertically of the ora terminalis place of described roll adjacent through-holes is provided with two locating flanges, and the described iron core that is set in the through hole is positioned between two locating flanges.

Periphery in the roll bottom on the described bobbin support body is provided with low-voltage terminal, and described primary coil winding terminal connects low-voltage terminal, and described low-voltage terminal exposes outside housing.

On the described bobbin support body in roll end positions place radially respectively projection the HV Terminal frame is arranged, the HV Terminal frame is provided with HV Terminal, the winding terminal of described secondary coil connects HV Terminal, described secondary coil is wrapped between the sub-frame of two high-pressure sides, and described HV Terminal is exposed outside described housing.

Described housing lateral margin is provided with groove, is embedded with the adjustment button in the groove.

The fastener that also comprises a fixed iron core and housing.

The high and low pressure terminal that exposes outside housing is connected with interlock circuit, gives the sealing location behind the accommodation space of the housings of all packing into such as online pedestal body, coil, iron core.

Further specify technology of the present utility model below in conjunction with the embodiment accompanying drawing.

Fig. 1 is a traditional monitor picture tube electron gun structural representation.

Fig. 2 is the three-dimensional decomposition texture schematic diagram of traditional monitor picture tube transformer.

Fig. 3 shows structural representation for the parts of traditional monitor picture tube transformer cut open.

Fig. 4 is a transformer circuit structural representation shown in Figure 3.

Fig. 5, Fig. 6, Fig. 7 are the waveform schematic diagram of transformer at following scan period of different situation and stray voltage Vc '.

Fig. 8 is the schematic diagram that noise voltage VC ' disturbs the picture tube picture.

Fig. 9 is the bobbin perspective view of the utility model picture tube transformer.

Figure 10 is that the loop A-A of picture tube transformer shown in Figure 9 is to the sectional structure schematic diagram.

Figure 11 is the parts decomposition texture schematic diagram of picture tube transformer shown in Figure 9.

Addressed before the explanation of Fig. 1 to Fig. 8 and repeated no more.

Referring to Fig. 9, Figure 10, picture tube transformer provided by the utility model, its coil comprise a primary coil 410, level coil 411, dielectric film 60 and a bobbin support body 70.Bobbin support body 70 is provided with roll 71, and the center of roll 71 is provided with the through hole 72 that runs through this bobbin support body 70, and the size of through hole 72 just can make one group of iron core 30,31 (referring to Figure 11) be sheathed on wherein.The ora terminalis place of roll 71 adjacent through-holes 72 symmetry vertically extends two locating flanges 78, and the iron core 30,31 that is sheathed in the through hole 72 can be positioned between two flanges.The surface of roll 71 is provided with space and several floors 73 of projection radially, and 73 of floors are formed with winding slot 74, and primary coil 410 is wrapped in the winding slot 74 in regular turn.The periphery that is positioned at roll 71 bottoms on the bobbin support body 70 is provided with the winding terminal that several low-voltage terminals 75 are used to connect primary coil 410.Be positioned at the appropriate position radially projection HV Terminal frame 76 at roll 71 two ends on the bobbin support body 70, HV Terminal frame 76 is provided with several HV Terminal 77, be used to connect the winding terminal of secondary coil 411,76 on the sub-frame of two high-pressure sides keeps a suitable distance, twines required coil turn therebetween.

When winding around, at first each winding terminal with elementary level circle 410 is connected on the low-voltage terminal 75, in regular turn primary coil 410 is wrapped in the winding slot 74 on roll 71 surfaces again, until around to the required number of turn, then on primary coil 410 around the dielectric film 60 that covers the suitable number of turns, the winding terminal of secondary coil 411 is connected on the HV Terminal 77 and with coil is wrapped in regular turn on the dielectric film 60 at last until the required number of turn.

High-voltage capacitance 43 that can transformer is required during enforcement is around overlaying on the secondary coil 411, also can by conventional practice as shown in Figure 2 high-voltage capacitance 43 is configured in addition coil near.

Referring to Figure 11, be the three-dimensional decomposition texture schematic diagram of this picture tube transformer, this transformer comprises a housing 11, is provided with accommodation space 12 in the housing, bobbin support body 70 and on the primary coil 410 that twined, secondary coil 411 and other building blocks all can be placed in the housing 11.Housing 11 lateral margin appropriate positions are provided with groove 13, groove 13 just can make one to adjust button 20 embeddings wherein, after all components is all packed in the accommodation space 12 of housing 11, sealing is located again, and with height set on the bobbin support body 70, low-voltage terminal 77,75 exposed are connected with interlock circuit outside, one group of iron core 30, the 31 through hole 72 interior fasteners 32 that also pass through that are sheathed on support body 70 are fixed, the through hole 72 of center through hole 45 that just runs through housing 11 unshakable in one's determination and bobbin support body 70 and form a normal magnetic circuit, the high voltage set cable in housing 11 bottom high pressure delivery outlets 14 that is produced by transformer secondary output coil 411 is delivered to the anode button 10 of display picture tube 1.

Dielectric film can do the elasticity adjustment on demand around covering the number of turns, can effectively control distance between primary and secondary coil at the picture tube of different designs by adjusting the dielectric film number of turns, as 1-3mm, and magnetic coupling degree therebetween, leakage field etc.

Transformer of the present utility model is by the primary and secondary bobbin in the single insulation bobbin replacement traditional transformer, efficiently solve conventional transformer structure complexity, part assembly program complexity, cost of manufacture problem of higher, improved the ratio of performance to price, on the single insulating bobbin, finish the coiling of primary coil earlier, after covering dielectric film, twine secondary coil again, effectively control magnetic coupling degree and leakage field between primary and secondary coil by what adjust dielectric film around covering the number of turns, thereby design the transformer of optimization; This transformer has saved the secondary bobbin of being made by the poisonous chemical material of thermoplasticity in the traditional transformer, also is a significant contribution to the protection environment.

Claims (7)

1, a kind of transformer of display picture tube comprises the housing that is provided with accommodation space and is contained in accommodation space interior coil, iron core and bobbin, it is characterized in that:

Described bobbin is made of bobbin support body and the roll that is arranged on the bobbin support body, and the roll center is provided with the through hole that runs through the bobbin support body, and described iron core is set in the through hole;

Described coil comprise be wrapped in the lip-deep primary coil of roll, around overlaying on the dielectric film ring layer on the primary coil superficies and being wrapped in secondary coil on the dielectric film ring layer outermost surface.

2, the transformer of display picture tube according to claim 1 is characterized in that: described roll surface is provided with the space and the floor of projection radially, forms winding slot between floor, and described primary coil is wrapped in the winding slot in regular turn.

3, the transformer of display picture tube according to claim 1 is characterized in that: the symmetry extension vertically of the ora terminalis place of described roll adjacent through-holes is provided with two locating flanges, and the described iron core that is set in the through hole is positioned between two locating flanges.

4, the transformer of display picture tube according to claim 1, it is characterized in that: the periphery in the roll bottom on the described bobbin support body is provided with low-voltage terminal, described primary coil winding terminal connects low-voltage terminal, and described low-voltage terminal exposes outside housing.

5, the transformer of display picture tube according to claim 1, it is characterized in that: on the described bobbin support body in roll end positions place radially respectively projection the HV Terminal frame is arranged, the HV Terminal frame is provided with HV Terminal, the winding terminal of described secondary coil connects HV Terminal, described secondary coil is wrapped between the sub-frame of two high-pressure sides, and described HV Terminal is exposed outside described housing.

6, the transformer of display picture tube according to claim 1 is characterized in that: described housing lateral margin is provided with groove, is embedded with the adjustment button in the groove.

7, the transformer of display picture tube according to claim 1 is characterized in that: the fastener that also comprises a fixed iron core and housing.

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