CN102034607A

CN102034607A - High frequency high voltage capacitor and preparation method thereof

Info

Publication number: CN102034607A
Application number: CN 201010133432
Authority: CN
Inventors: 陈清国
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-27
Filing date: 2010-03-27
Publication date: 2011-04-27

Abstract

The invention belongs to the technical field of the preparation of the radio component and particularly relates to a capacitor and a preparation method, wherein the working frequency of the capacitor is from dozens of kilohertzs to several millionkilo hertzs and the working voltage ranges from several kilovolts to more than ten kilovolts. The capacitor contains an upper copper plate electrode (1) and a lower copper plate electrode (3); a PVC insulated sleeve (2) is arranged between the upper copper plate electrode and the lower copper plate electrode, the inside of the insulated sleeve is provided with an insulated mandrel (shown in the picture 2); and a film layer is wound on the mandrel, and the film layer contains a first polytetrafluoroethylene film (4), a first copper film (5), a second polytetrafluoroethylene film (6) and a second copper film (7) in turn. As the insulated film layer adopts the polytetrafluoroethylene films, the loss is extremely low; the loss tangent is no more than 2-2.5*10<-4>W/kvar; the operating temperature ranges from -55 DEG C to 260 DEG C; and the optimal insulating property surface resistance can reach 5*10<13> Omega/cm.

Description

High-frequency and high-voltage capacitor and preparation method thereof

Technical field

The invention belongs to radio component manufacturing technology field, be specifically related to capacitor and manufacture method, operating frequency is from tens KHZ---several MKHZ, and operating voltage is from several KV---tens KV.

Background technology

The domestic high pressure ceramic dielectric capacitor of producing all is an imitative Soviet Union product at present, its dielectric material is " a safe health porcelain ", is the last century achievement just, in the last hundred years, it is the capacitor that high-power high-frequency oscillator device oscillation circuit is used always, the kind that does not have other to substitute.The production process of this capacitor is various, the per pass operation all might go out waste product, what is particularly worth mentioning is that sintering process, its optimal sintering temperature approximately is a degree more than 1,000 4 hundred, but the temperature difference up and down only allows two degree, if the temperature control means are poor slightly, or the staff does not do one's duty slightly, will go out substandard products or waste product, in user's hand, may work less than just damaging half a day.Owing to there is not the capacitor of other kinds to make comparisons, therefore can't determine that also the index of its each side is advanced person or backwardness, but in fact can say something from one, on the catalogue, an index " loss angle tangent " of high-voltage ceramic capacitor is smaller or equal to 1 * 10 before the sixties in last century ^-4Watt/kilovar, then be 1.2 * 10 on the present catalogue ^-3Watt/kilovar, be to " dead end is the road not ".

There are a lot of organic polymer polymerization insulating material to come out now, wherein is no lack of the dielectric material of using as capacitor, the thin-film material that our positive searching is a kind of can be replaced " safe health porcelain ", and develop a kind of novel capacitor arrangement, it is big to come real realization can produce that volume is little, capacitance reaches reactive power greatly, safe and reliable, cheap and good-quality high-frequency and high-voltage capacitor.

Summary of the invention

Purpose of the present invention must solve two as the requisite problem of high-frequency and high-voltage electric capacity:

The one,, powerful high-frequency work electric current, what at present the power capacitor of producing adopted is polypropylene film, and its double layer of metal membrane electrode is wrapped in the two layer medium film fully, two terminations that only stay two electrode films, the thin copper wire of two 0.3～0.5mm of burn-oning.Then with and the way of series connection form the big electric capacity that can bear several hectovolts to tens kilovolt.But because of the lead-in wire of each electric capacity is all very thin, therefore total operating current maximum also can only reach several amperes, but we need can reach more than tens amperes.

The 2nd,, the problem how heating that the condenser dielectric loss brings dispels the heat, above-mentioned power capacitor can't conduct heat in the medium and can only transmit by medium itself because of metal electrode is wrapped in, and therefore has only the heat radiation of the oil immersed type of employing.

The structure of capacitor of the present invention, two electrodes are only encased two terminations and a side by dielectric material, and two metal film electrodes are respectively from drawing on the connection pole plate separately after a side is exposed respectively, for optimal condition has been created in big conduction and big heat conduction.Be wound on the thin layer on the plug, wherein two-layer copper film exposes insulating thin layer from dual-side up and down respectively, and other several sides then all are insulated layer parcel.

Be exactly to have selected what dielectric material for use at last, because the good and bad quality that directly influences capacitor of dielectric material.We have selected polytetrafluoroethylene film for use, it have other materials can't than advantage:

1, minimum loss, its loss angle tangent is smaller or equal to 2～2.5 * 10 ^-4Watt/kilovar, be minimum in the macromolecule polymeric material, therefore also claim the plastics king.

2, the wideest maximum operating temperature :-55 ℃～260 ℃.

3, Zui Jia insulation property, it is to detest water section bar material, under the situation of bone dry and under relative temperature 98% situation, its sheet resistance can both reach 5 * 10 ¹³Ω/cm.

Shortcoming is that dielectric strength is lower, is the 60KV/mm direct current, and we adopt the film of 0.6mm just can meet the demands.Advantage of the present invention: as long as 1 hold the gate of the quality monitoring of dielectric material, every product closes and detects in the production process, just can guarantee the quality of product; 2, can produce the product of various different sizes at any time according to user's needs; 3, with the cost of the relatively equal capacity of old product, this electric capacity has only 50% of old product.

Description of drawings

Fig. 1 is an outward appearance front view of the present invention; Fig. 2 is the insulation mandrel front view; Fig. 3 is the thin layer schematic diagram.

As shown in the figure, structure of the present invention is 1 and 3 to be respectively upper end copper coin electrode and lower end copper coin electrode, middle is PVC insulating sleeve 2, there is insulation mandrel (Fig. 2) inside, and being wound on the plug is thin layer, ground floor poly tetrafluoroethylene 4, ground floor copper film 5, second layer poly tetrafluoroethylene 6, second layer copper film 7 is with this sequence arrangement.

Claims

1. The high-frequency and high-voltage capacitor, two electrodes are only encased two terminations and a side by dielectric material, two metal film electrodes are respectively from drawing on the connection pole plate separately after a side is exposed respectively, it is characterized in that being wound on the thin layer on the plug, wherein two-layer copper film exposes insulating thin layer from dual-side up and down respectively, and other several sides then all are insulated layer parcel.

2. The preparation method of high-frequency and high-voltage capacitor is characterized in that insulating thin layer is a polytetrafluoroethylene film.