CN204577823U - A kind of coaxial state pulse forming line based on helical structure - Google Patents
A kind of coaxial state pulse forming line based on helical structure Download PDFInfo
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- CN204577823U CN204577823U CN201520282295.6U CN201520282295U CN204577823U CN 204577823 U CN204577823 U CN 204577823U CN 201520282295 U CN201520282295 U CN 201520282295U CN 204577823 U CN204577823 U CN 204577823U
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- forming line
- pulse forming
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Abstract
The utility model discloses a kind of coaxial state pulse forming line based on helical structure, belong to high power pulse modulation technique field.This coaxial state pulse forming line is made up of tubular glass ceramics medium, cylindrical internal electrode, tubular external electrode, is concentric arrangement between three, is followed successively by electrode in cylindrical metallic, tubular ceramic dielectric, cylindrical metallic external electrode from inside to outside.Wherein, tubular external electrode processes helical groove, to form male helicoid electrode structure.Under the prerequisite of volumetric axial length not increasing pulse forming line, screw electrode structure significantly can increase the width of pulse forming line output electric pulse, effectively achieves the miniaturization of pulse power device simultaneously.
Description
Technical field:
The utility model relates to the state pulse forming line in high power pulse modulation technique field, especially a kind of can be used for increasing output electric pulse width based on the coaxial state pulse forming line of helical structure.
Background technology:
High power pulse modulation technique is the electric field with higher density or magnetic field energy that store a kind of " slowly ", and time scale is compressed, and then in very short time, (20-100ns) discharges to the electric physical technique of load.Pulse forming line is the main method of generation hundred nanosecond quasi-square wave long pulse, is one of critical component of high power pulse modulating device.High power pulse modulating device has important using value in civilian and national defence, is to carry out the important tests platform that High-Power Microwave, electron beam pumping high power laser light, X ray, ion source, waste gas waste water treatment, sterilization and food fresh keeping, medical treatment etc. study.And these application paired pulses power modulators propose miniaturization, long pulse and the requirement of long life.
At present, pulse forming line mainly adopts liquid energy-accumulating medium, such as transformer oil, deionized water etc.But, lower (the relative dielectric constant ε of transformer oil dielectric constant
rgeneral between 2 ~ 3), according to energy storage density formula U=1/2 ε
0ε
re
2(ε
0for permittivity of vacuum, E is dielectric breakdown field intensity) can find out, low dielectric constant and disruptive field intensity can cause low energy storage density, so transformer oil unit volume energy storage density is not high, cause forming line energy storage section volume larger.In addition, liquid medium reliability is not high, easily breaks down, and causes the practical difficulty of device to strengthen; Adaptive capacity to environment is not strong, and as under the adverse circumstances such as high temperature or low temperature, liquid medium character easily changes, and causes device normally to work.And some liquid energy-accumulating medium needs to be equipped with auxiliary device, as deionized water medium (relative dielectric constant ε
r=81) although have relatively high energy storage density, it needs auxiliary device to maintain its high resistivity, causes whole pulse power device bulky.
Compared with liquid medium, solid energy storage medium is owing to having high-k and disruptive field intensity (namely having high energy storage density), have the advantage such as low-dielectric loss and high resistivity concurrently simultaneously, pulse power source apparatus based on solid energy storage dielectric line itself has miniaturization, long-life and steady performance.The common structure of pulse forming line has coaxial configuration and slab construction two kinds.State pulse forming line generally adopts slab construction, as the solid pulse power device [Chen Yi of Fluid Physics Inst., China Engineering Physics Academy's development, summer wins successively, Wang Wei, etc. " the solid pulse power technology based on photoconductive switch peace printed line ", " Terahertz science and electronic information journal ", 2014, Vol.12, No.1, pp:32-36] in designed dull and stereotyped pulse forming line.This device uses the pulse forming line of slab construction, selects CaO-TiO
2-Al
2o
3for raw material, obtained by solid sintering technology, its relative dielectric constant ε
rabout 23, ceramic dielectric physical dimension is 170mm × 15mm × 1mm, silver electrode size 150mm × 4mm, and the width of its output electric pulse is 11.3ns.In order to prevent that edge flashing (a kind of high electrical breakdown phenomenon) occurs between slab construction pulse forming line upper/lower electrode, dielectric-slab in slab construction pulse forming line is done very wide (the wide 15mm of dielectric-slab by this solid pulse power device, the wide 4mm of silver electrode), reduce energy storage material practical application volume, have impact on the miniaturized index of whole pulse power device.In addition, needing the application expanding this solid pulse power device, the width of this device output electric pulse is also inadequate.
The pulse forming line of coaxial configuration is included among external electrode due to interior electrode, and shield effectiveness is better, less to the parasitic couplings of surrounding, is also widely used.Utility model patent " a kind of coaxial state pulse forming line based on glass ceramics medium " (patent No.: CN 203589443 U), give a kind of coaxial state pulse forming line based on glass ceramics medium, comprise tubular glass ceramics medium, interior electrode, external electrode and coated semiconductor, internal and external electrode is fired respectively on the inside and outside wall of this tubular glass ceramics medium, and coated semiconductor is coated in the glass ceramics dielectric surface beyond internal and external electrode, in addition, S.K.Sharma, pulse forming line in the paper " a kind of compact barium titanium pottery pulse forming line " that the people such as P.Deb and R.Shukla deliver for 2011 on " scientific instrument comment " (Review of Scientific Instruments) also uses coaxial configuration [S.K.Sharma, P.Deb, R.Shukla, et al.Compact pulse forming line using barium titanate ceramic material.Review of Scientific Instruments, 2011, 82 (11), pp:115102-115102-3].The solid-state coaxial pulse mentioned in these two sections of documents forms the width T=2 (ε of line output electric pulse
r)
1/2(l is the axial length that coaxial pulse forms line to l/c, c is the light velocity in vacuum), forming line dielectric material if therefore determined, only having by increasing the axial length forming line, just can increase the width that solid-state coaxial pulse forms the output electric pulse of line.
In view of Pulse Power Techniques miniaturization, long pulse and the requirement of long life, current miniaturized state pulse forming line faces the inadequate difficulty of output electric pulse width, and slab construction pulse forming line limits the lifting of its voltage because easily there is surface electrical flashover breakdown between upper/lower electrode; Simultaneously, it is very large that the large volume forming process of ceramics being applicable to pulse power device prepares difficulty, and the disruptive field intensity of solid state medium significantly can decline along with the increase of dielectric thickness, solid state medium is difficult to play its high breakdown field strength ability, so simple increase state pulse forming line length and thickness can not solve the problem.Therefore, under original volume size restriction of solid state medium, designing a kind of state pulse forming line structure that can increase output electric pulse width is the technical problem that those skilled in the art very pay close attention to.
Utility model content:
The technical problems to be solved in the utility model is: can the limited width of output electric pulse for existing state pulse forming line, and easily there is the problem that flashover limits its high voltage serviceability between slab construction pulse forming line upper/lower electrode, a kind of coaxial state pulse forming line of helical structure being applicable to miniaturized high power pulse power device is proposed.
The technical solution adopted in the utility model is:
A kind of coaxial state pulse forming line based on helical structure, be made up of electrode in tubular ceramic dielectric, cylindrical metallic external electrode and cylindrical metallic, be concentric arrangement between three, be followed successively by electrode in cylindrical metallic, tubular ceramic dielectric, cylindrical metallic external electrode from inside to outside.
Described tubular ceramic dielectric is made up of aluminium oxide ceramics, and its axial length is l
0, in cylinder, outer radius is respectively r
1, r
2, (r
2-r
1) be the wall thickness of this tubular ceramic dielectric, the withstand voltage that the wall thickness of this tubular ceramic dielectric is designed by pulse forming line determines; For coaxial state pulse forming line, in order to ensure output electric pulse waveform quality, general axial length l
0>>r
2, usually get l
0/ r
2≈ 10.
In described cylindrical metallic, electrode and cylindrical metallic external electrode are respectively by firing the inner and outer wall being attached to described tubular ceramic dielectric, and in cylindrical metallic, the length of electrode and cylindrical metallic external electrode is l
1, for reducing the possibility of electrode and cylindrical metallic external electrode edge generation surface breakdown in cylindrical metallic, all there is certain distance l at the two ends of the two ends distance tubular ceramic dielectric of two electrodes
2, meet l
2=(l
0-l
1)/2>=1cm, l
2for the length of metal inner electrode and metal external electrode is stretched out at tubular ceramic dielectric two ends, the utility model gets l
2=1cm.
Described cylindrical metallic external electrode is processed with helical groove, and the pitch of described helical groove is p, and the width of helical groove is δ, and the degree of depth of helical groove need ensure the original metal level ground off on external electrode.Empirically, require (p-δ) >4mm, to reduce the turn-to-turn generation electrical breakdown of helicoid when this pulse forming line discharges; Require δ/(p-δ) >3, prevent the electromagnetic coupled of pulse forming line; Dispersion conditions requires the axial length l of screw electrode
1>>p, the utility model gets l
1/ p ≈ 10.
The utility model has following technique effect:
1. adopt coaxial configuration, the possibility that between pulse shaping line electrode, edge flashing punctures can be reduced;
2. metal external electrode adopts helical structure, the coaxial solid-state formation line output electric pulse width of same volume size can be increased, be conducive to alleviating the difficulty prepared at large volume energy storage ceramic medium formation line, promote the miniaturization of whole pulse power device, long pulse and long-life serviceability.
Accompanying drawing illustrates:
Fig. 1 is the background technology patent No. is a kind of coaxial state pulse forming line structure chart based on glass ceramics medium provided in the utility model patent " a kind of coaxial state pulse forming line based on glass ceramics medium " of CN 203589443U;
Fig. 2 is the coaxial state pulse forming line structural representation of helical structure described in utility model;
Fig. 3 is the coaxial state pulse forming line cutaway view of helical structure described in utility model and concrete scale diagrams;
Fig. 4 is the pulse shaping experimental circuit of state pulse forming line coaxial described in utility model;
The 50ns pulsewidth voltage waveform produced based on the coaxial aluminium oxide ceramics medium pulse formation line of helical structure that Fig. 5 designs for the National University of Defense technology.
Embodiment:
Fig. 1 is a kind of coaxial state pulse forming line structure chart based on glass ceramics medium that utility model patent " a kind of coaxial state pulse forming line based on glass ceramics medium " provides, this pulse forming line comprises tubular glass ceramics medium 1, interior electrode 2, external electrode 3 and coated semiconductor 4, 5, interior electrode 2 fires the middle part of the inwall in the axis along tubular glass ceramics medium 1, external electrode 3 fires the middle part of the outer wall in the axis along tubular glass ceramics medium 1, coated semiconductor 4, 5 edge of staying being coated in tubular glass ceramic dielectric 1 both ends are divided.
Fig. 2 is the coaxial state pulse forming line structural representation of helical structure described in the utility model, Fig. 3 is this pulse forming line cutaway view and concrete scale diagrams, the coaxial state pulse forming line of helical structure described in the utility model comprises tubular ceramic dielectric 1, electrode 2 in cylindrical metallic, cylindrical metallic external electrode 3.Described tubular ceramic dielectric axial length is l
0, in cylinder, outer radius is divided into r
1, r
2, the pitch and the helical groove width that cylindrical metallic external electrode process helical groove are respectively p, δ, and the axial length of internal and external electrode is l
1, the distance at distance tubular ceramic dielectric two ends, internal and external electrode two ends is l
2.
Fig. 4 is the pulse shaping experimental circuit of coaxial state pulse forming line described in the utility model, have studied the pulse output characteristic of the coaxial state pulse forming line of helical structure.In figure, TL is the coaxial state pulse forming line of this helical structure, and V0 is DC power supply 2, S is main switch, and Rc is the large valued resistor of charging, and Rload is noninductive resistance load, and load region line is as far as possible compact.The course of work of pulse forming line is electric flux compression process in time.DC power supply gives this helical structure coaxial state pulse forming line charging, and now main switch is in off-state.When after charging complete, main switch transfers conducting to by off-state, now can acquire other voltage square wave of nanosecond in load.
The coaxial aluminium oxide ceramics medium pulse of helical structure that utilizes that Fig. 5 designs for University of Science and Technology for National Defence forms the voltage waveform that line produces 50ns pulsewidth, the coaxial aluminium oxide ceramics medium firing inside and outside metal electrode can be customized directly to Shaanxi Baoguang Ceramic Science And Technology Co., Ltd., and the major parameter of this ceramic pulse forming line is as follows: tubular aluminium oxide ceramics medium axial length is l
0=340mm, in cylinder, outer radius is divided into r
1=26.5mm, r
2=33.5mm, on metal external electrode, the pitch of helical groove and helical groove width are respectively p=25mm, δ=5mm, l
2=1cm.The helical groove degree of depth is 2mm, much larger than only there being the adhesion metal layer thickness of some tens of pm (depth of groove is accomplished millimeter magnitude is the restriction receiving slot grinding process, and when minimizing metallization process sinters, metal can penetrate into the impact of pottery on a small quantity) as far as possible.As shown in Figure 5, abscissa representing time, ordinate represents voltage to the voltage square wave that this helix produces in load.Shown in Fig. 5, the halfwidth of this square-wave pulse is 50ns.
Were it not for helical structure, utilize formula T=2 (ε
r)
1/2l/c, (aluminium oxide ceramics relative dielectric constant gets ε to the output electric pulse width of calculating same size ceramic dielectric coaxial pulse formation line
r=9.3), obtain its pulsewidth and be only about 7ns.As can be seen here, the utility model state pulse forming line adopts helical structure, significantly can increase the width of pulse forming line output electric pulse, does not increase the volume of pulse forming line simultaneously, thus ensures the miniaturization of pulse forming line.
Claims (7)
1. the coaxial state pulse forming line based on helical structure, it is characterized in that: described pulse forming line is made up of electrode (2) in tubular ceramic dielectric (1), cylindrical metallic and cylindrical metallic external electrode (3), be concentric arrangement between three, be followed successively by electrode in cylindrical metallic (2), tubular ceramic dielectric (1), cylindrical metallic external electrode (3) from inside to outside;
Described tubular ceramic dielectric (1) is made up of aluminium oxide ceramics, and its axial length is l
0, in cylinder, outer radius is respectively r
1, r
2, (r
2-r
1) be the wall thickness of this tubular ceramic dielectric (1), the withstand voltage that the wall thickness of this tubular ceramic dielectric (1) is designed by pulse forming line determines;
In described cylindrical metallic, electrode (2) and cylindrical metallic external electrode (3) are respectively by firing the inner and outer wall being attached to described tubular ceramic dielectric (1), and in cylindrical metallic, the length of electrode (2) and cylindrical metallic external electrode (3) is l
1;
Described cylindrical metallic external electrode (3) is processed with helical groove, and the pitch of described helical groove is p, and coil width is δ, and the degree of depth of helical groove need ensure to grind off the original metal level on metal external electrode (3).
2. as claimed in claim 1 based on the coaxial state pulse forming line of helical structure, it is characterized in that: the axial length l of its tubular ceramic dielectric (1)
0>>r
2.
3., as claimed in claim 2 based on the coaxial state pulse forming line of helical structure, it is characterized in that: l
0/ r
2≈ 10.
4. as claimed in claim 1 based on the coaxial state pulse forming line of helical structure, it is characterized in that: meet (p-δ) >4mm, δ/(p-δ) >3, l
1>>p.
5., as claimed in claim 4 based on the coaxial state pulse forming line of helical structure, it is characterized in that: meet l
1/ p ≈ 10.
6. as claimed in claim 1 based on the coaxial state pulse forming line of helical structure, it is characterized in that: all there is certain distance l at the two ends at two ends distance tubular ceramic dielectric (1) of metal external electrode (3) and metal inner electrode (2)
2, meet l
2=(l
0-l
1)/2>=1 centimetre.
7. as described in claim 1 to 6 arbitrary based on the coaxial state pulse forming line of helical structure, it is characterized in that: l
0=340mm, r
1=26.5mm, r
2=33.5mm, p=25mm, δ=5mm, helical groove degree of depth 2mm, l
2=1cm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712744A (en) * | 2016-12-14 | 2017-05-24 | 中国人民解放军国防科学技术大学 | Semicircular coaxial high-power pulse formation line |
| CN105306016B (en) * | 2015-09-18 | 2017-12-15 | 西北核技术研究所 | Coaxial spiral reentries pulse-forming line |
| CN107565938A (en) * | 2017-09-08 | 2018-01-09 | 中国人民解放军国防科技大学 | Solid-state high-power pulse forming line with vortex line type electrode structure |
-
2015
- 2015-05-05 CN CN201520282295.6U patent/CN204577823U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306016B (en) * | 2015-09-18 | 2017-12-15 | 西北核技术研究所 | Coaxial spiral reentries pulse-forming line |
| CN106712744A (en) * | 2016-12-14 | 2017-05-24 | 中国人民解放军国防科学技术大学 | Semicircular coaxial high-power pulse formation line |
| CN106712744B (en) * | 2016-12-14 | 2020-01-24 | 中国人民解放军国防科学技术大学 | Semicircular coaxial high-power pulse forming line |
| CN107565938A (en) * | 2017-09-08 | 2018-01-09 | 中国人民解放军国防科技大学 | Solid-state high-power pulse forming line with vortex line type electrode structure |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160505 |
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| CF01 | Termination of patent right due to non-payment of annual fee |