CN2238512Y

CN2238512Y - High voltage generator for video indicator

Info

Publication number: CN2238512Y
Application number: CN 95227653
Authority: CN
Inventors: 邓明进
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-28
Filing date: 1995-12-28
Publication date: 1996-10-23
Anticipated expiration: 2005-12-28

Abstract

The utility model relates to a high voltage generator for video indicators used to transport anode high voltage to a CRT. The high voltage generator for video indicator is composed of an iron core, a main coil insulatively wound and covered on the iron core, a high-voltage coil insulatively wound and covered on the main coil, and a high voltage gold foil capacitor insulatively wound and covered on the high-voltage coil. The innermost layer of the high voltage gold foil capacitor is connected with the high voltage end of the high-voltage coil, and the outermost layer of the high voltage gold foil capacitor is connected with ground potential. The iron core can be designed to be an upper casing with center convex posts and a lower casing with center convex posts. The upper casing and the lower casing are assembled to form a closed magnetic circuit and an encapsulating outer shell. The high voltage generator for video indicators can effectively decrease the electro magnetic interference, reduce the volume of high voltage devices, simplify assembly program and reduce cost.

Description

The high-voltage generator of video display

The utility model relates to a kind of video display parts, relates to the high-voltage generator of video display cathode ray tube or rather.

At present, video display widespread usage cathode ray tube is as computer monitor of color TV, high definition etc.Figure 1 shows that electron gun 2 structures of conventional video display cathode ray tube 1, mainly comprise the negative electrode 3 that can produce three-color electron beam, produce electronics along the G1 control utmost point 4 directions, this G1 control utmost point 4 and 5 combinations of G2 anode, in electron gun 2, form an electron beam forming area (BFR), the electronics of band energy forms three-color electron beam, along vertically to and linear array.Electron gun 2 also includes G3 focusing electrode 6 and G4 anode 7, said elements combination back forms a high pressure condenser lens, electron beam is focused on the fluorescence coating 9 of display screen 8 of cathode ray tube, fluorescence coating 9 is according to electron beam sensitization, and forms video image on display screen 8.The cathode ray tube of conventional video display all needs to produce high voltage by an anode high voltage generator, and provide operate as normal required anode high voltage by anode button 10 to cathode ray tube, so high pressure generator is the requisite critical elements of video display cathode ray tube.According to the different requirements of cathode ray tube type, application mode and demand, the magnitude of voltage magnitude range that high pressure generator provided is between thousands of volts are to 30,000 volts.

Shown in Figure 2 is the Knock-Down Component schematic diagram of traditional anode high voltage generator, is provided with an accommodation space 12 in the housing 11, support body 40 and on high-voltage capacitance 43, coil 41 and other rectifier cells 42 etc. installed just can be placed in this housing 11.Housing 11 lateral margin appropriate positions are established groove 13, and are adjusted buttons 20 and just can be embedded in this groove 13, treat that said elements all is assembled in the accommodation space 12 of housing 11 after, give sealing again and fix.But connecting line 44 essential the exposing outside on the support body 40 are connected with other interlock circuits by terminals 44.One group of U sections heart 30,31 is set on the through hole 45 of support body 40, fixing by fastener 32, this iron core is just through coil 41 central authorities, form a closed magnetic circuit, by the high voltage that the coil 41 of anode high-voltage generator is produced, set cable exports the anode button 10 of the cathode ray tube 1 of video display to from the high pressure delivery outlet 14 of housing 11 bottoms.

Figure 3 shows that the circuit diagram that the conventional anode high pressure generator is connected with cathode ray tube and other circuit, the anode high voltage generator mainly comprises a main coil 40, several high-tension coils 411 and a high-voltage capacitance 43, main coil 410 1 ends 412 are connected with the DC power supply of video display, and its other end 413 is connected with the square-wave generator of video display through horizontal output switch 414.The frequency period ground that this horizontal feed switch 414 is pressed square-wave generator switches, and its frequency is between between 15KHz to 120KHz.Each high-tension coil 411 forms n high-tension coil by actual demand serial connection n high-voltage rectification element 42 (diode), sheathed one group of U sections heart 30,31 between each coil, and form a magnetic circuit.High voltage electric capacity 43 is in parallel with high-tension coil 411, can effectively reduce the ripple in the high voltage.Electric capacity one end exports high voltage the cathode ray tube 1 of video display to, and the total load R of the cathode ray tube 1 of this video display is about 25 * 10 ⁶Ω, total capacitance value CT is about 1500PF.

Because main coil 410, high-tension coil 411, high-voltage rectification element 42, high-voltage capacitance 43 interelements such as grade must be made appropriate insulation and handle, therefore after they being assembled in the housing of making by thermoplastic material, need to make each element insulating with insulating polymeric material such as epoxy sealing location.

When horizontal output switch 414 cuts out, DC power supply is by 412 power supplies of main coil 410 1 ends, main coil 410 produces magnetic energy and accumulates in wherein, when the 414 moments unlatching of horizontal output switch, this switch 414 will produce about 1000V alternating-current pulse, high-tension coil 411 superposes pulse gradually in regular turn and rises to a sizable numerical value according to the transformation principle of anode high voltage generator, and design load can reach 3KV to 30KV.The high pressure that produces exports the anode of video display cathode ray tube to, thereby capacitor C T will be charged to high magnitude of voltage.When the cathode ray tube normal operation of video display, its load resistance R obtains energy from capacitor C T, and the high pressure of saving among the capacitor C T is reduced gradually, arrives until next pulse and replenishes high voltage electric energy again.As from the foregoing, traditional anode high voltage generator produces a ripple voltage by direct current component, and when load current was high more, its ripple voltage value was big more.

The ripple voltage target ray tube that high pressure generator produced is disadvantageous, therefore installs high-voltage capacitance 43 additional and makes it in parallel with cathode ray tube, in the hope of eliminating ripple voltage.Electric capacity 43 is the independent components in the anode high voltage generator, consideration based on secure context, 43 suitable gaps of essential maintenance of electric capacity 43 and high-tension coil 411 and high-voltage rectification element, otherwise after insulation processing is made in the sealing location, if the high-voltage pulse in the problem of the generation high-tension coil 411 will produce corona phenomenon, this corona not only may be damaged the anode high voltage generator, and easy initiation fire, and has abnormal electromagnetic interference before high pressure generator is damaged.

In addition, make the thermoplastic of housing and be used for its heat conductivity of insulating material of sealing location poor, its heat energy of accumulating can form heat effect to high-voltage rectification element 42 and high-voltage capacitance 43 etc., is heated to 100 ℃ from 30 ℃ of room temperatures, has reduced the useful life of element significantly.Consider fail safe and reliability, must keep an appropriate gap between high-voltage capacitance and high-tension coil.In addition, for avoiding two adjacent high-tension coils of high-voltage breakdown, enough distances (about 1mm) also need be arranged between each high-tension coil, therefore outer field high-tension coil more should be away from main coil, thereby cause the magnetic field coupling lax, the ringing effect (ringing) that this phenomenon will cause people not expect can cause interference with mode target ray tube or the miscellaneous part that video disturbs.

In sum, the anode high voltage generator of the cathode ray tube of conventional video display is because complex structure, in addition part assembly program is numerous and diverse, has caused the increase of cost of manufacture.

The purpose of this utility model is that the high-voltage generator to said structure makes improvements design, not only can dwindle its volume, and can effectively reduce the program and the cost of other part assembling.

The utility model with the high pressure goldleaf electric capacity in the high-voltage generator directly on the high-tension coil that is overlying on the hollow insulation body, make the innermost layer of high pressure goldleaf electric capacity be connected with the high-pressure side of high-tension coil, and the outermost layer earthing potential of high pressure goldleaf electric capacity, realize dwindling the high-voltage generator volume with this, effectively reduce the goal of the invention of other part assembly program and cost etc.

The high-voltage generator of the utility model video display, constitute by iron core, a main coil, a high-tension coil, a high-voltage capacitance, main coil one end is connected with the dc power supply terminal of video display, the main coil other end is connected with the square-wave generator output of video display through the horizontal output switch, high-tension coil one end ground connection, its high-pressure side is connected and connects the anode button of video display cathode ray tube with high-voltage capacitance, high-voltage capacitance other end ground connection is characterized in that:

Described main coil insulation ground is around being overlying on the described iron core, described high-voltage coil insulation ground is around being overlying on the described main coil, described high-voltage capacitance is made up of the high voltage goldleaf capacitances in series that one side more than is coated with dielectric film, described high pressure goldleaf electric capacity is directly around being overlying on the described high-tension coil, high pressure goldleaf electric capacity innermost layer one end connects the high-pressure side of described high-tension coil, high pressure goldleaf electric capacity outermost layer one end connects earth potential, described iron core runs through described main coil center, and surrounds described main coil, high-tension coil and high pressure goldleaf electric capacity and form a closed magnetic circuit.

The positive electrode goldleaf elongated end of an electric capacity is that the negative electricity of another adjacent serial connection electric capacity is extreme in each adjacent serial connection electric capacity of described high pressure goldleaf electric capacity.

The positive electricity end of the last serial connection electric capacity of described high pressure goldleaf electric capacity connects described cathode ray tube anode button.

Described main coil is around being overlying on the hollow insulation body, described iron core is made by ferromagnetic material, lower house, on, lower house two outer ends are closed, the two corresponding inner shapes that become to open, be oppositely arranged the center projection in the last lower house, described by hollow insulation body and insulate in turn around the main coil that covers, high-tension coil, high pressure goldleaf electric capacity is contained in, between the center projection and housing of lower house, there is fastener set to connect, lower house, on, the week of lower house open end, the periphery because of high pressure goldleaf electric capacity contacted with each other, on, the center projection of lower house contacts with each other in the central hole of hollow insulation body, on described, lower house is provided with anode cable, is connected with the anode button of described cathode ray tube.

The length that the length of described hollow insulation body is longer than the main coil, high-tension coil and the high pressure goldleaf electric capacity that are coated on the body.

Described iron core is made by ferromagnetic material, lower house, described upper shell is the disk body shape, which is provided with a center projection, described main coil, high-tension coil and high pressure goldleaf electrical condenser minor insulation ground are around overlaying on the projection of center, described lower house one end is open shape, the other end becomes closed, the lower house of open shape one end is provided with accommodation space, there is fastener set to connect, lower house, the disk body periphery of lower house and upper shell and center projection contact with each other respectively at the periphery and the center position of high pressure goldleaf electric capacity, on described, lower house is provided with anode cable, is connected with the anode button of described cathode ray tube.

Be embedded with the adjustment button of adjusting described focus of cathode-ray tube voltage on the outer surface of described upper and lower casing.

At least be provided with one on the described upper and lower casing for the hole of filling location with colloid or fixer.

At least be provided with a hole that supplies terminals to be connected on the described upper and lower casing with circuit.

Also be provided with dielectric film between described main coil, high-tension coil and high pressure goldleaf electric capacity.

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

Fig. 1, traditional structure video display CRT electrom gun structural representation

Fig. 2, traditional structure video display cathode ray tube anode high voltage generator decomposition texture schematic diagram

The connection layout of Fig. 3, traditional structure anode high voltage generator and cathode ray tube and other circuit

The partial cutaway schematic of the high pressure generator of Fig. 4, this improvement structure video display

Each electric capacity connection diagram in Fig. 5, Fig. 4 mesohigh goldleaf electric capacity

Elements such as main coil, dielectric film, high-tension coil and high pressure goldleaf electric capacity are in regular turn around the combination schematic diagram that covers hollow insulation body in Fig. 6, Fig. 4 mesohigh generator

The assembling schematic diagram of Fig. 7, Fig. 4 mesohigh generator

Addressed before Fig. 1 to Fig. 3 and repeated no more.

Referring to Fig. 4, be the partial cutaway schematic of the high pressure generator of video display, high pressure generator mainly comprises a main coil 510, a high-tension coil 511 and a high pressure goldleaf electric capacity 531.Main coil 510 1 ends connect the DC power supply (not shown) of video display, the main coil other end is connected (not shown) through the horizontal output switch with the square-wave generator of video display, and the horizontal output switch is according to the frequency period ground diverter switch of square-wave generator.Please in conjunction with referring to Fig. 7, an end 512 ground connection of high-tension coil 511, another high-pressure side 513 is connected with high pressure goldleaf electric capacity 531, is arranged with one group of iron core 60,61 between coil and forms a normal magnetic circuit.Main coil 510 first wire-wounds are on hollow insulation body 50, on main coil 510, coat one deck dielectric film 514 again, then with a high voltage coil 511 wire-wounds on this layer dielectric film 514, will be coated with the high voltage goldleaf electric capacity 531 of dielectric film more directly around being overlying on the high-tension coil 511 at last.

Referring to Fig. 5, high pressure goldleaf electric capacity 531, by n goldleaf capacitor C 1, C2 ... the Cn formation of connecting, n can set as required.Two wherein adjacent serial connection electric capacity such as C1 and C2, the anodal goldleaf of an electric capacity extend as the negative pole of another electric capacity and the rest may be inferred, and form the high pressure goldleaf electric capacity 531 of induction type.

Referring to Fig. 6, the innermost layer of high pressure goldleaf electric capacity 531 is connected with the high-pressure side 513 of high-tension coil, its high-pressure side 513 also is connected to the anode button of cathode ray tube, be the anode that is delivered to cathode ray tube through the high voltage that lead 533 is produced high pressure goldleaf electric capacity 531, the outermost layer of high pressure goldleaf electric capacity then is connected to earth potential by lead 532.Begin around covering because goldleaf electric capacity 531 is high-pressure side 513 places by high-tension coil 511, when when covering to outermost layer, current potential is reduced as earth potential, so, can make 511 of each electric capacity 531 and high-tension coils need not reserve suitable gap.

Referring to Fig. 7, in regular turn by after being overlying on the hollow insulation body 50, make upper and lower casing 60,61 by material unshakable in one's determination at elements such as main coil 510, dielectric film 514, high-tension coil 511 and high pressure goldleaf electric capacity 531 again, said elements is coated on wherein.The one end sealing of upper and lower casing 60,61, the relative other end is open, and accommodation space 611 wherein just can be with aforementioned wherein ccontaining around all elements that are overlying on this hollow insulation body 50.In the accommodation space 611 of upper and lower casing respectively correspondence establish center projection 612, when upper and lower casing 60,61 is finished assembling by fastener 613, the set center projection in the periphery of two housings open end and center thereof just can contact with each other respectively at the periphery of high pressure goldleaf electric capacity 531 and centre bore 501 places of hollow insulation body 50, makes the center projection of assembling back upper and lower casing 60,61 form closed magnetic circuit.In addition, because the length of hollow insulation body is longer than around the length (seeing Fig. 6, Fig. 7) that overlays on main coil 510, dielectric film 514, high-tension coil 511 and high pressure goldleaf electric capacity 531 on the body, therefore when hollow insulated tube body 50 and in the element that covers is encapsulated in upper and lower casing 60,61 time, the length 502 that this hollow insulation body 50 two ends are reserved just can make 60,61 of all elements and upper and lower casings keep an appropriate insulation distance, makes the shell formation one after the assembling seal housing.

The utility model embodiment also can be made into the garden plate-like with an end of upper shell 60, establish center projection 612 on it, main coil 510 is around being overlying on this center projection 612, coated insulation rete 514 on main coil 510 again, with high-tension coil 511 wire-wounds on insulating film layer 514, the last high pressure goldleaf electric capacity 531 that will be coated with dielectric film again is around being overlying on the high-tension coil 511, and lower house 61 1 ends become the open shape of ccontaining this upper shell, and the other end becomes closed.The accommodation space 611 of this lower house 61 just can be with aforementioned wherein ccontaining around all elements that are overlying on the upper shell 60 center projections 612, when upper and lower casing 60,61 fits together by fastener 613, lower house 61 just can contact with each other respectively at the periphery and the center position thereof of high pressure goldleaf electric capacity 531 with the garden dish periphery and the center projection of upper shell 60, upper and lower casing forms magnetic circuit by center projection 612, and housing is sealed in shell formation.

Because main coil 510, elements such as high-tension coil 511 and high pressure goldleaf electric capacity 531 all can be when making elder generation's covering insulating film, so dielectric film that coats between

main coil

510 and 511 dielectric films that coated 514 of high-tension coil and each high pressure goldleaf electric capacity, all can design, to strengthen each interelement compressive resistance by actual demand.

Referring to Fig. 7, when the assembling upper and lower casing, can be embedded one in the surface of shell appropriate position and adjust button 62 again, export the focus voltage of cathode ray tube with adjustment to.The appropriate position of housing also is provided with anode cable 615 and is connected with the anode of cathode ray tube, makes the high pressure of generation be delivered to anode button through cable 615.In addition, establish a hole 614 at least, make terminals 64 connect other interlock circuits, and can in housing, load location colloid or fixer, each element in being encapsulated in is located by hole 614 by hole 614 in the appropriate position of upper and lower shell surface.

The utility model does not adopt the poisonous chemical material of thermoplasticity to make housing and has solved the problem of environmental protection aspect; Interelements such as main coil and high pressure goldleaf electric capacity, housing unshakable in one's determination 60,61 need not the gap that keeps suitable, can effectively exempt because of the incomplete bubble that causes of insulation processing, promptly solve the corona problem that produces by high-voltage pulse in the high-tension coil, reduced damage chance and abnormal electromagnetic interference thereof of anode high voltage generator; Thereby each interelement need not to keep appropriate gap to reduce the volume of anode high voltage generating means; Existing anode high voltage generating means structure is simple and assembly program simplification than traditional structure, thereby cost of manufacture reduces and performance is better; Because high pressure goldleaf electric capacity is directly around being overlying on the high-tension coil, thereby the electromagnetic wave that can effectively absorb high-tension coil and produced, the interference of electromagnetic radiation reduced to other electronic components; Because goldleaf electric capacity has preferable heat conductivity, the therefore direct heat energy that can leave and produce preferably by high-tension coil around the goldleaf electric capacity that is overlying on the high-tension coil.

Claims

1, a kind of high-voltage generator of video display, constitute by iron core, a main coil, a high-tension coil, a high-voltage capacitance, main coil one end is connected with the dc power supply terminal of video display, the main coil other end is connected with the square-wave generator output of video display through the horizontal output switch, high-tension coil one end ground connection, its high-pressure side is connected and connects the anode button of video display cathode ray tube with high-voltage capacitance, high-voltage capacitance other end ground connection is characterized in that:

2, the high-voltage generator of video display according to claim 1 is characterized in that: the positive electrode goldleaf elongated end of an electric capacity is that the negative electricity of another adjacent serial connection electric capacity is extreme in each adjacent serial connection electric capacity of described high pressure goldleaf electric capacity.

3, the high-voltage generator of video display according to claim 2 is characterized in that: the positive electricity end of the last serial connection electric capacity of described high pressure goldleaf electric capacity connects described cathode ray tube anode button.

4, the high-voltage generator of video display according to claim 1, it is characterized in that: described main coil is around being overlying on the hollow insulation body, described iron core is made by ferromagnetic material, lower house, on, lower house two outer ends are closed, the two corresponding inner shapes that become to open, be oppositely arranged the center projection in the last lower house, described by hollow insulation body and insulate in turn around the main coil that covers, high-tension coil, high pressure goldleaf electric capacity is contained in, between the center projection and housing of lower house, there is fastener set to connect, lower house, on, the week of lower house open end, the periphery because of high pressure goldleaf electric capacity contacted with each other, on, the center projection of lower house contacts with each other in the central hole of hollow insulation body, on described, lower house is provided with anode cable, is connected with the anode button of described cathode ray tube.

5, the high-voltage generator of video display according to claim 4 is characterized in that: the length that the length of described hollow insulation body is longer than the main coil, high-tension coil and the high pressure goldleaf electric capacity that are coated on the body.

6, the high-voltage generator of video display according to claim 1, it is characterized in that: described iron core is made by ferromagnetic material, lower house, described upper shell is the disk body shape, which is provided with a center projection, described main coil, high-tension coil and high pressure goldleaf electrical condenser minor insulation ground are around overlaying on the projection of center, described lower house one end is open shape, the other end becomes closed, the lower house of open shape one end is provided with accommodation space, there is fastener set to connect, the disk body periphery of lower house and upper shell and center projection contact with each other respectively at the periphery and the center position of high pressure goldleaf electric capacity, on described, lower house is provided with anode cable, is connected with the anode button of described cathode ray tube.

7, according to the high-voltage generator of claim 4 or 6 described video displays, it is characterized in that: be embedded with the adjustment button of adjusting described focus of cathode-ray tube voltage on the outer surface of described upper and lower casing.

8, according to the high-voltage generator of claim 4 or 6 described video displays, it is characterized in that: be provided with one on the described upper and lower casing at least for the hole of filling location with colloid or fixer.

9, according to the high-voltage generator of claim 4 or 6 described video displays, it is characterized in that: be provided with a hole that supplies terminals to be connected on the described upper and lower casing at least with circuit.

10, according to the high-voltage generator of claim 4 or 6 described video displays, it is characterized in that: also be provided with dielectric film between described main coil, high-tension coil and high pressure goldleaf electric capacity.