CN108461240A - A kind of varistor module and lightning-protection module - Google Patents
A kind of varistor module and lightning-protection module Download PDFInfo
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- CN108461240A CN108461240A CN201810259896.3A CN201810259896A CN108461240A CN 108461240 A CN108461240 A CN 108461240A CN 201810259896 A CN201810259896 A CN 201810259896A CN 108461240 A CN108461240 A CN 108461240A
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- varistor
- metal electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
A kind of varistor module and lightning-protection module, varistor module includes varistor component and metallic electrode components, the varistor component includes the first varistor, second varistor and third varistor, the metallic electrode components include the first metal electrode film, the third metal electrode of second metal electrode film and " П " shape, first varistor, first metal electrode film, second varistor, second metal electrode film and the third varistor are cascading to form a stackable unit, and the third metal electrode is folded in the outside of the stacking direction of the stackable unit, the stackable unit is located in the space of third metal electrode enclosing.Lightning-protection module of the present invention solves the problems, such as that traditional lightning-protection module volume is big and energy tolerance level is low.
Description
Technical field
The invention belongs to electrical device technologies field more particularly to a kind of varistor module and lightning-protection modules.
Background technology
Currently, being conducted through the intrusion type lightning impulse come to take precautions against from low-voltage power supply line, electrical equipment is all in power end
Mouth is provided with the lightning-protection module or lightning protection component of certain protection level.For the electrical equipment of common single phase power supply, adopt more
The syntype schemes of prevention against lightning formed with three varistors, typical lightning protection circuit are as depicted in figs. 1 and 2：Fig. 1 uses three
Common varistor constitutes differential mode and common mode lightning Protection, and lightning strike protection is provided to AC power AC port, but to pressure
The fail safe (the common failure mode of varistor is to burn short circuit) of quick resistance itself is not taken precautions against, lightning protection component
There are security risks for itself；Fig. 2 is connected using the disconnected type Thermal Cutoffs of hot melt with varistor, Thermal Cutoffs and varistor
Ontology have direct heat transfer, typically the metal pins of fuse are directly welded on the silver-colored face of varistor, profit
The heat of varistor is directly conducted on the low-temperature alloy tin bar inside fuse with metal pins, makes Thermal Cutoffs can
To follow the temperature change of varistor, when the temperature on varistor is more than the fusing-off temperature of Thermal Cutoffs, temperature is protected
Dangerous silk will fuse, and cut-out power grid prevents the serious excess temperature catching fire of varistor to the power frequency perfusion of varistor.This tool
There is the varistor of excess temperature fuse body to be commonly called as " thermal tripping type varistor ".
The schemes of prevention against lightning of traditional use 3 " thermal tripping type varistor " need using 3 sets it is separate monitoring and
Indicating circuit monitors and indicates whether each Thermal Cutoffs has acted failure respectively, this not only causes number of elements is various can
The problem of being reduced by property, and many PCB surface products are occupied, hinder the miniaturization of schemes of prevention against lightning.In addition, TOV
(Temporary Over-Voltage, transient overvoltage) impact generates a large amount of heat on varistor, makes varistor
Temperature rapid increase, if Wen Sheng touches the phase transformation damage warm area of Oxide Varistor Ceramic, varistor may be caused to burn short
Fail (this is also the most common failure phenomenon of varistor) in road.Single independent varistor since small thermal capacity is low,
Wen Sheng higher when being impacted by TOV, therefore TOV overvoltage tolerance levels are relatively low.
Invention content
The present invention provides a kind of varistor module and lightning-protection module, it is intended to solve that traditional lightning protection component volume is big and energy
Measure the low problem of tolerance level.
A kind of varistor module, including varistor component and metallic electrode components, the varistor component include
First varistor, the second varistor and third varistor, the metallic electrode components include the first metal electrode film,
The third metal electrode of second metal electrode film and " П " shape, first varistor, first metal electrode film, institute
The second varistor, second metal electrode film and the third varistor is stated to be cascading to form a stacking list
Member, and the third metal electrode is folded in the outside of the stacking direction of the stackable unit, the stackable unit is located at described
In the space that third metal electrode encloses.
The third metal electrode is by thin flat sheet of metal punching press and bending forming, including patch in one of the embodiments,
The first electrode inserted sheet being welded on the outside of first varistor is closed, and fitting is welded on the outside of the third varistor
Second electrode inserted sheet, and be connected between one end of the first electrode inserted sheet and one end of the second electrode inserted sheet and position
Connection electrode piece except the varistor component；The first electrode inserted sheet and described and second electrode inserted sheet include institute
It states our department of varistor component fitting welding and extends to the extraction end except the stackable unit.
In addition, a kind of lightning-protection module is additionally provided, including above-mentioned varistor module, the first Thermal Cutoffs component and
Two Thermal Cutoffs components；The first Thermal Cutoffs component and the second temperature fuse component are sticked respectively described
Varistor module is in the two opposite outer of the stacking direction.
The first Thermal Cutoffs component has the first pin and second pin in one of the embodiments, described
Power firestreak input terminal of first pin as lightning-protection module, the second pin are connected to first metal electrode film；It is described
There is second temperature fuse component third pin and the 4th pin, the third pin to be inputted as the zero-power line of lightning-protection module
End, the 4th pin are connected to second metal electrode film；Grounding pin of the third metal electrode as lightning-protection module.
The first Thermal Cutoffs component and second temperature fuse component include tool in one of the embodiments,
There are the ceramic shell and two elastic metallic leads being arranged in the cavity of part of cavity, two elastic metallic leads
Welded together with low-temperature alloy scolding tin after the bend by pressure deformation of top and be housed in the cavity, and two elasticity gold
Belong to the top of lead when pad melts can back movement, the respective other end of two elastic metallic leads exposes to institute
Ceramic shell is stated as two pins, the ceramic shell is sticked in the varistor module in the outer of the stacking direction
Side.
The ceramic shell includes ceramic base and the ceramics that are closed with the ceramic bottom flap in one of the embodiments,
Head cover, the ceramic shell offer the through-hole through the ceramic base and the ceramic coping, the third metal electrode
It is equipped with the blade for being pierced by the through-hole in the two opposite outer surface of the stacking direction, the ceramic shell is fixed simultaneously
It is tightly attached to the outer surface of the third metal electrode.
In addition, it includes varistor component and metallic electrode components, the varistor component packet to additionally provide another
Include the first varistor, the second varistor, third varistor and the 4th varistor, the metallic electrode components include the
4th metal electrode of one metal electrode film, the second metal electrode film, third metal electrode film and " П " shape, first gold medal
Belong to electrode slice, first varistor, second varistor, second metal electrode film, the third pressure sensitive valve
Piece, the 4th varistor, second metal electrode film and the third metal electrode film are cascading to be formed
One stackable unit, and one end of the 4th metal electrode be folded in first varistor and second varistor it
Between, the other end of the 4th metal electrode is folded between the third varistor and the 4th varistor.
The 4th metal electrode is by thin flat sheet of metal punching press and bending forming, including patch in one of the embodiments,
Close and be welded on first electrode inserted sheet between first varistor and second varistor, and fitting be welded on it is described
Second electrode inserted sheet between third varistor and the 4th varistor, and be connected to and the first electrode inserted sheet
Connection electrode piece between one end and one end of the second electrode inserted sheet and except the varistor component.
In addition, another lightning-protection module is additionally provided, including above-mentioned varistor module, the first Thermal Cutoffs component
And second temperature fuse component；The first Thermal Cutoffs component is sticked in first metal electrode film in the stacking
The outside of unit stacking direction, the second temperature fuse component are sticked in the third metal electrode film in the stacking side
To outside.
The first Thermal Cutoffs component has the first pin and second pin in one of the embodiments, described
Power firestreak input terminal of first pin as lightning-protection module, the second pin are connected to first metal electrode film；It is described
There is second temperature fuse component third pin and the 4th pin, the third pin to be inputted as the zero-power line of lightning-protection module
End, the 4th pin are connected to the third metal electrode film；Grounding lead of second metal electrode film as lightning-protection module
Foot.
" thermal tripping of the above-mentioned stacked varistor module and lightning-protection module relative to conventionally employed 3 discretes
The schemes of prevention against lightning of type varistor ", the 1/2 of only traditional schemes of prevention against lightning lightning protection component total volume.In addition, only being protected with two temperature
Dangerous silk component can give multiple varistors of entire lightning-protection module to provide excess temperature fail safe, this not only saves one
Thermal Cutoffs, and can only be monitored with indicating circuit with the detection of a set of fuse and indicate that two excess temperature tripping mechanisms are
It is no to have acted failure.And the stacked multiple varistors welded together back-to-back in substance form a unification
" heat storage ", it is stacked since the volume of " multi-disc unification varistor module " is 3-4 times of single varistor
The thermal capacity of the equivalent thermal capacity of each varistor independent varistor more single than tradition improves 2 in varistor module
~3 times, due to greatly improving for equivalent thermal capacity, make stacked varistor mould each varistor in the block to lightning stroke
The tolerance level of transient energy and TOV transient state overvoltage impact energy, which has, significantly to be promoted, and single valve is greatly reduced
The warm increasing degree degree of piece, enhances the energy tolerance level of each valve block, to improve the lightning stroke through-current capability of varistor with
Transient state overvoltage tolerance.
Description of the drawings
Fig. 1 is the circuit diagram that full mould lightning Protection is constituted using traditional three common varistors；
Fig. 2 is the circuit diagram that lightning Protection is carried out using traditional disconnected type varistor of fuse hot melt；
Fig. 3 is the lightning-protection module structural schematic diagram that embodiment one of the present invention provides；
Fig. 4 is the application circuit schematic diagram using lightning-protection module shown in Fig. 3；
Fig. 5 is the lightning-protection module structural schematic diagram that embodiment two of the present invention provides；
Fig. 6 is the application circuit schematic diagram using lightning-protection module shown in Fig. 5.
Specific implementation mode
In order to make the purpose of the present invention, technical solution and feature performance benefit be more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
Please refer to Fig. 3 and Fig. 4, the lightning-protection module that embodiment one of the present invention provides, including：Varistor module 100,
One Thermal Cutoffs component 200 and second temperature fuse component 300；
The varistor module 100 includes varistor component 110 and metallic electrode components 120, varistor component
110 include the first varistor 111, the second varistor 112 and third varistor 113, and metallic electrode components 120 include the
The third metal electrode 123 of one metal electrode film 121, the second metal electrode film 122 and " П " shape,
First varistor 111, the first metal electrode film 121, the second varistor 112,122 and of the second metal electrode film
Third varistor 113 is cascading to form a stackable unit；And third metal electrode 123 is folded in the layer of stackable unit
The outside in folded direction, stackable unit are located in the space of the enclosing of third metal electrode 123.
The equivalent thermal capacitance of each varistor in module greatly improved in the varistor module of stack integration welding
Amount makes each varistor have the tolerance level of lightning stroke energy and TOV transient state overvoltage energy and is significantly promoted, from
And the lightning stroke through-current capability of varistor and anti-TOV transient state overvoltage capabilities are improved, and the varistor mould of integration welding
Block greatly reduces the total volume of varistor module, and condition is created for the Miniaturization Design of schemes of prevention against lightning.
In the present embodiment, each of three varistors silver face on be coated with before welding tin cream so as to metal electrode
Between form stable rigid solder.First metal electrode film 121 and the second metal electrode film 122 include and varistor component
Our department 120a and extend to the extraction end 120b except stackable unit that 110 fittings are welded.
Third metal electrode 123 is by thin flat sheet of metal punching press and bending forming, including to be welded on described first pressure-sensitive for fitting
The first electrode inserted sheet 123a in 111 outside of valve block, and fitting are welded on the second electrode inserted sheet in 113 outside of third varistor
123b, and be connected between one end of first electrode inserted sheet 123a and one end of second electrode inserted sheet 123b and be located at pressure sensitive valve
Connection electrode piece 123c except chip part 110；It first electrode inserted sheet 123a and is oppositely arranged with second electrode inserted sheet 123b, even
The both ends of receiving electrode piece 123c connections first electrode inserted sheet 123a and second electrode inserted sheet 123b homonymies, stackable unit are located at described
The sky that first electrode inserted sheet 123a, the second electrode inserted sheet 123b and connection electrode piece 123c of third metal electrode 123 are enclosed
In.
First electrode inserted sheet 123a and with second electrode inserted sheet 123b include varistor component 110 be bonded welding our department
With extend to the extraction end except the stackable unit.First metal electrode film 121, second the 122, first electricity of metal electrode film
Our department of pole inserted sheet 123a and second electrode inserted sheet 123b are made of flat sheet-like (round, ellipse, rectangle) metal, exit
Portion is the pin terminals extended outward to form by our department.
First Thermal Cutoffs component 200 and second temperature fuse component 300 are sticked respectively in varistor module 100
In the two opposite outer of stacking direction.
There is the first Thermal Cutoffs component 200 first pin 21 and second pin 22, first pin 21 to make
For the power firestreak input terminal of the lightning-protection module, the second pin 22 passes through PCB copper with first metal electrode film 121
Skin (or cable) connects altogether；The second temperature fuse component 300 has third pin 31 and the 4th pin 32, the third
Zero-power line input terminal of the pin 32 as the lightning-protection module, the 4th pin 31 and second metal electrode film 122
It is connect altogether by PCB copper sheets (or cable)；The third metal electrode 123 has each exit 123d around, can make
For the protective ground end of the lightning-protection module.
The red copper that first metal electrode film 121 and the second metal electrode film 122 use heat conductivility excellent is as flat electricity
The material of pole, and coat tin cream between varistor silver face and flat electrode and fill gap, make varistor and flat metal
Rigid solder is formed between electrode, to ensure that the heat that each valve block generates can quickly conduct between multiple valve blocks, is made more
A varistor forms unified " accumulation of heat is whole ", greatly improves " the equivalent thermal capacity " of each varistor, increases
The energy tolerance level of strong varistor；Flat metal electrode is almost covered with entire pressure-sensitive silver-colored face, is led by copper material is excellent
Hot property can make the temperature rapid homogeneity between each position of varistor, substantially reduce varistor and rushed in high current
Hit the lower probability that failure is burnt because of part " hot stove " excess temperature.
The processing difficulties of traditional " thermal tripping type varistor " are to control the sweating heat damage phenomenon of Thermal Cutoffs.By
In the high heat capacity characteristic of varistor, if obstinately the pin of fuse is welded to above pressure-sensitive silver-colored face, just it is bound to pair
Fuse generates a degree of thermal damage.Welding thermal damage is avoided, should just avoid Thermal Cutoffs being directly welded at
On the ontology of varistor.Therefore, the first Thermal Cutoffs component 200 and second temperature fuse component 300 include
Two elastic metallic leads that ceramic shell 24 with cavity and part are arranged in the cavity, two elastic metallic leads
Welded together with low-temperature alloy scolding tin after the bend by pressure deformation of top and be housed in the cavity, and two elastic metallic leads
Top when pad melts can back movement, the respective other ends of two elastic metallic leads exposes to the work of ceramic shell 24
For two pins, the ceramics of the ceramic shell 24 and second temperature fuse component 300 of the first Thermal Cutoffs component 200
Shell 24 is sticked respectively in varistor module 100 in two opposite exterior lateral sides of the stacking direction.Abandoning tradition Thermal Cutoffs
That leans on the capillarity after tin bar liquefaction to shrink the disjunction mode for breaking tin bar, using the metal wire of high resiliency and high tenacity
Pin of the material (such as carbon steel wire or beryllium copper line) as fuse carries out solder joint excess temperature using pin natural resiliency deformation restoring force
It is detached from disjunction, the excess temperature breaking speed of solder joint is greatly improved, the energy of breaking arc is greatly reduced, effectively improve the electricity of fuse
Flow point cutting capacity.The eutectic welding contact of Novel fuse is once more than the melting temperature of scolding tin, in fuse lead own resilient
Under effect, the top of two leads is swung to negative direction, and fuse by permanently reliably disjunction, will not just occur as conventional video cassette
The unreliable situation being connected to again after that disjunction of Thermal Cutoffs.
The ceramic shell 24 includes ceramic base 24a and the ceramic coping 24b with ceramic base 24a lid conjunctions, institute
It states ceramic shell 24 and offers through-hole 24c through ceramic base 24a and ceramic coping 24b, through-hole 24c can be rectangle, circle
Shape etc., the third metal electrode 123 are equipped in opposite two outer surface of the stacking direction for being pierced by the through-hole
The outer surface of third metal electrode 123, the specifically first electricity are fixed and be tightly attached to ceramic shell 24 by the blade 24d of 24c
Pole inserted sheet 123a outer surfaces and second electrode inserted sheet 123b outer surfaces..Thermal tripping protection mechanism is tightly attached to pressure cell
Surface rather than be directly welded on pressure-sensitive silver-colored face, prevented traditional " thermal tripping type varistor " and produced in processing welding process
Raw " thermal damage " phenomenon to low-temperature alloy tin bar, ensure that the consistency of the through-flow index of lightning stroke of batch production product with it is steady
It is qualitative.In order to which Thermal Cutoffs to be fixed on to the surface of " varistor module 100 ", especially rushed on third metal electrode 123
Two blade 24ds vertical with varistor surface are extruded, with two rectangular through holes being opened in advance on Thermal Cutoffs
24c coordinates, and above-mentioned two metal blade 24d is made to pass through the two rectangular through holes 24c, to which Thermal Cutoffs is steadily tight
Gu in the outer surface of " pressure-sensitive module 10 ".
For the production method of above-mentioned lightning-protection module：
One, first it is assembly and welding to " three pieces unify varistor module "：
1. by each surface silk of the first varistor 111, the second varistor 112 and third varistor 113
The tin cream of appropriate thickness on the process brush of wire mark brush；In one embodiment, tin cream is high silver-colored tin cream, and tin cream is from varistor side
Edge is in 2mm or more, in case in welding process spilling and sagging occur for tin cream；
2. first electrode inserted sheet 123a, second electrode inserted sheet 123b are then inserted into the first varistor 111 and the respectively
Between two varistors 112, between the second varistor 112 and third varistor 113, by these three valve blocks and two electrodes
Concentric alignment is folded constitutes stackable unit together；
Its opening is set slightly to narrow several millimeters when 3. customizing " П " shape third metal electrode 123, by " П " shape the before assembly
The opening of three metal electrodes 123 struts a bit, and the stackable unit for then installing a upper process is inserted into " П " shape third metal
Among electrode 123, release opening tension allows the screen resilience of " П " shape metal electrode 40 to compress stackable unit naturally；
So that all parts is in concentric position 4. pair stackable unit carries out shaping with third metal electrode 123, is then fed into
Reflow soldering carries out high temperature reflux welding.
Two, followed by the assembly and welding of Thermal Cutoffs component：
1. silver-plated or tin plating processing is carried out to the elastic metallic wire rod of a diameter of 1mm first, to ensure metal lead wire
Lightning stroke through-current capability meets design requirement with solderable row；
2. then being carried out to elastic wire with Sheet Metal Forming Technology preforming, make the excurvation arcuation of formation crescent shape at the top of lead；
3. the lead of two same shapes is then respectively charged into preset lead in ceramic base 24a by opposite direction
Slot position；
It is bent 4. the top of two leads is stirred to centre simultaneously and them is made to contact with each other；
5. the low temperature scolding tin with 135 DEG C welds together at the top of two leads securely, low-temperature alloy welding is formed
Point；
6. ceramic coping 24b is slid into ceramic base 24a slots position along designed button bit and locks together the two；
Three and then two Thermal Cutoffs are fastened on to two side external surfaces of " three pieces unify varistor module 100 "：
1. two through-hole 24c that the first Thermal Cutoffs component 200 is opened in advance are inserted in 100 outer surface of varistor module
Two blade 24d, and the blade 24d for exposing fuse surface across square hole press-bendings are flattened on fuse head cover surface；
2. another Thermal Cutoffs component 300 to be fastened on to another table of varistor module 100 in the same fashion
Face.
Four, finally entire lightning-protection module is encapsulated with organic siliconresin or epoxy resin, encapsulating number is twice
To three times, to ensure insulation compressive resistance that encapsulated layer has enough thickness to be resistant to 2.5KV.
So far " lightning-protection module of three varistor integrations welding ", which makes, finishes.
Fig. 5 and Fig. 6 are please referred to, the lightning-protection module in embodiment two of the present invention includes the 100, first temperature of varistor module
Spend fuse component 200 and second temperature fuse component 300；Varistor module 100 includes varistor component 110 and gold
Belong to electrod assembly 120, varistor component 110 includes the first varistor 111, the second varistor 112, third varistor
113 and the 4th varistor 114, metallic electrode components 120 include the first metal electrode film 121, the second metal electrode film 122,
4th metal electrode 124 of third metal electrode film 123 and " П " shape, the first metal electrode film 121, first pressure sensitive valve
It is piece 111, second varistor 112, the second metal electrode film 122, the third varistor 113, the described 4th pressure-sensitive
Valve block 114 and the third metal electrode 123 are cascading to form a stackable unit, and the 4th metal electrode
124 one end is folded between first varistor 111 and second varistor 112, the 4th metal electrode
124 other end is folded between the third varistor 113 and the 4th varistor 114.
In the present embodiment, the first metal electrode film 121, the second metal electrode film 122 and third metal electrode 123 include with
Our department 120a and extend to the extraction end 120b except stackable unit that the fitting of varistor component 110 is welded.
4th metal electrode 124 is by thin flat sheet of metal punching press and bending forming, including to be welded on described first pressure-sensitive for fitting
First electrode inserted sheet 124a between valve block 111 and second varistor 112, and fitting are welded on the third pressure sensitive valve
Second electrode inserted sheet 124b between piece 113 and the 4th varistor 114, and be connected to the first electrode inserted sheet 124a's
Connection electrode piece between one end and one end of the second electrode inserted sheet 124b and positioned at the varistor component 110
124c.It first electrode inserted sheet 124a and is oppositely arranged with second electrode inserted sheet 124b, connection electrode piece 124c connection first electrodes
The both ends of inserted sheet 124a and second electrode inserted sheet 124b homonymies, stackable unit are located at the first electricity of the third metal electrode 124
In the space that pole inserted sheet 124a, second electrode inserted sheet 124b and connection electrode piece 124c are enclosed.
First electrode inserted sheet 124a and with second electrode inserted sheet 124b include varistor component 110 be bonded welding our department
With extend to the extraction end except the stackable unit.First metal electrode film 121, the second metal electrode film 122, third gold
The our department for belonging to electrode slice 123, first electrode inserted sheet 124a and second electrode inserted sheet 124b is flat sheet-like (round, ellipse, square
Shape) metal is made, and it is the pin terminals extended outward to form by our department to draw end.In the present embodiment, " П " shape third metal
The not outer metal pins drawn of electrode 124, third metal electrode 124 are served only for the first varistor 111 and second of internal connection
Varistor 112, the first varistor 111 of internal connection are connected to third varistor 112 with the 4th varistor 114, inside
With the 4th varistor 113, the pressure-sensitive module-external of core need not be drawn out to.
First Thermal Cutoffs component 200 is sticked in first metal electrode film 111 in the stackable unit stacking side
To outside, the second temperature fuse component 200 is sticked in the third metal electrode film 113 in the stacking direction
Outside.
There is the first Thermal Cutoffs component 200 first pin 21 and second pin 22, first pin 21 to make
For the power firestreak input terminal of the lightning-protection module, the second pin 22 and the first metal electrode film 121 pass through PCB copper sheets
(or cable) connects altogether；There is the second temperature fuse component 300 third pin 31 and the 4th pin 32, the third to draw
Zero-power line input terminal of the foot 31 as the lightning-protection module, the 4th pin 32 pass through PCB copper with third metal electrode 123
Skin (or cable) connects altogether；Protectiveness ground terminal of second metal electrode film 122 as the lightning-protection module.
Material using the excellent red copper of heat conductivility as metallic electrode components 120, and varistor silver face with it is flat
Tin cream is coated between flat electrodes and fills gap, is formed rigid solder between each varistor and each metal electrode, is made four
Varistor is formed by welding the varistor module 100 of a stack back-to-back, to ensure the heat of each varistor generation
Amount can quickly conduct between multiple varistors, so that multiple varistors is formed unified " accumulation of heat is whole ", substantially
" the equivalent thermal capacity " for improving each varistor in module, greatly enhances the energy tolerance level of varistor；Flat metal
Electrode is almost covered with entire pressure-sensitive silver-colored face, by the heat conductivility that copper material is excellent, can make between each position of varistor
Temperature rapid homogeneity, substantially reduce varistor under heavy current impact because part " hot stove " excess temperature due to burn the several of failure
Rate.
In present embodiment, the first Thermal Cutoffs component 200 and second temperature fuse component 300 include tool
The two elastic metallic leads for having the ceramic shell 24 of cavity and being partly arranged in the cavity, two elastic metallic leads are respectively
It is arranged in the ceramic shell 24a, is welded with low-temperature alloy after the top bend by pressure deformation of two elastic metallic leads
Soldering is connected together and is housed in the cavity, and the top of two elastic metallic leads can phase when pad melts
Unlucky dynamic, the respective other end of two elastic metallic leads exposes to the ceramic shell 24 and is used as two pins, described
Ceramic shell 24 is sticked in the varistor module 100 in the outside of the stacking direction.Specifically, the first Thermal Cutoffs
200 ceramic shell 24 of component and the ceramic shell 24 of second temperature fuse component 300 are sticked respectively in the first metal electrode film
121 and third metal electrode film 123 outside.Abandoning tradition Thermal Cutoffs that by tin bar liquefaction after capillarity receive
The disjunction mode of tin bar is broken in contracting, using high resiliency and the metal wire rod (such as carbon steel wire or beryllium copper line) of high tenacity as insurance
The pin of silk carries out solder joint excess temperature using pin natural resiliency deformation restoring force and is detached from disjunction, greatly improves the excess temperature point of solder joint
Disconnected speed, is greatly reduced the energy of breaking arc, effectively improves the electric current breaking capacity of fuse.The eutectic welding of Novel fuse
Contact once more than scolding tin melting temperature, under the effect of fuse lead own resilient, the tops of two leads is to negative direction
It swings, fuse will not occur just by permanently reliably disjunction as being connected to after conventional video cassette Thermal Cutoffs that disjunction again
Unreliable situation.
The ceramic shell 24 includes patch ceramic base 24a and covers the ceramic coping 24b closed with the ceramic base 24a,
The shell 24 offers the through-hole 24c through the ceramic base 24a and the ceramic coping 24b, and through-hole 24c can be square
Shape, circle etc..The two opposite outer table in the stacking direction of first metal electrode film 121 and third metal electrode film 123
Face is equipped with the blade 24d for being pierced by through-hole 24c, and the fixation of the ceramic shell 24 is tightly attached to the varistor mould
The outer surface of block 10.In one embodiment, special in order to which Thermal Cutoffs to be fixed on to the surface of varistor module 100
Two leaflets vertical with varistor surface are not stamped out on the first metal electrode film 121 and third metal electrode film 123
Piece 24d coordinates with two rectangular through holes 24c being opened in advance on Thermal Cutoffs shell, above-mentioned two blade 24d is made to wear
The two through-holes 24c is crossed, and the metal blade that will be above fuse surface of shell is curved and overlayed on 24 surface of ceramic base, to
Thermal Cutoffs is steadily fastened on to the outer surface of varistor module 100.
Thermal tripping protection mechanism is tightly attached to the surface of pressure cell rather than is directly welded on pressure-sensitive silver-colored face, has prevented to pass
System " thermal tripping type varistor ", to " thermal damage " phenomenon of low-temperature alloy tin bar, ensure that caused by processing welding process
Produce the consistency and stability of the through-flow index of lightning stroke of product in batches.
Second embodiment includes 4 varistors, but erection welding processing method is similar to the first embodiment,
All it is that the 4th metal electrode 124 is installed again after first carrying out silk-screen printing tin cream to varistor, then by varistor module 100
It is put into brazier and carries out high temperature reflux welding, the Thermal Cutoffs of fixed both sides is installed in the same fashion later, finally with silicones
Or it is epoxy resin enclosed.
In addition：The differential mode lightning protection of second embodiment is concatenated by the first varistor 111 and the 4th varistor 114 two
Varistor is responsible for, and the value of the two varistor operation voltages should be equal to conventional single differential mode protection varistor action
The half of voltage, in case the excessively high damage of differential mode lightning stroke residual voltage is by protection equipment.
In the above two embodiments, " the heat of outside metal electrode is transmitted to minimize heat from varistor
Resistance " coats suitable high silver-colored tin cream between metal electrode and varistor silver face, pressure is sufficient filling with after making tin cream welding solidification
Gap between quick valve block and metal electrode increases the area of heat conduction, reduces the resistance of heat conduction.Similarly, on the outside
Suitable silicone grease is coated between metal electrode and Thermal Cutoffs shell, and silicone grease is made to be sufficient filling with Thermal Cutoffs shell and outside
Gap between electrode increases the area of heat conduction as possible, reduces the resistance of heat conduction.
The shell of Thermal Cutoffs uses the ceramic material of high thermal conductivity, and two leads of Thermal Cutoffs are using elasticity
By force, the high metal wire rod of toughness, is first pre-formed as crescent arcuation, and when welding makes the top of two elastic metallic leads by external force
End while inwardly center deformation are simultaneously touched, and are then connected together with 135 DEG C of eutectic welding soldering.Thermal Cutoffs pad week
Enough spaces need to be reserved by, which enclosing, ensures freely swinging for resilient lead, after the melts soldering tin of eutectic welding contact, elastic metallic
The top of lead is flicked to both sides naturally under the action of self-deformation restoring force, realizes quick excess temperature separation trip action.
The head cover of Thermal Cutoffs is locked with pedestal by specially designed groove snapping, is prevented in encapsulating material infiltration
Chamber, in order to avoid hinder freely swinging for fuse lead.
Either water mist influences the insulating capacity silicones of lightning-protection module to moisture or epoxy resin will welding in order to prevent
Good module is encapsulated, and the module encapsulated just becomes complete " more pieces of pressure sensitive valve block integrated welding connects lightning-protection module ".
Since metal electrode and voltage-sensitive ceramic valve block all have good heat conductivility, heat is in three/tetra- pressure-sensitive tiles
Between can freely conduct, any one varistor generate heat can rapidly conduct to other two valve blocks, make
Multiple varistors that stack welds together in substance form a unified heat storage.Due to varistor module
100 volume is 3-4 times of single varistor, therefore each " etc. of varistor in multi-disc unification varistor module 100
The thermal capacity of effect thermal capacity " independent varistor all more single than tradition improves 2~3 times.
Due to greatly improving for equivalent thermal capacity, make each varistor in " multi-disc unifies pressure-sensitive module " to lightning stroke
The tolerance level of energy, which has, significantly to be promoted, because the lightning stroke energy that single valve block absorbs is converted into after heat,
Heat is greatly reduced the lightning stroke temperature increasing degree degree of single valve block by quickly conducting to other several valve blocks, enhances each valve block
Lightning stroke energy tolerance level, to improve the lightning stroke through-current capability of varistor.
The impact of TOV transient overvoltages generates a large amount of heat on varistor, and making varistor, temperature rapid increase,
If Wen Sheng touches the phase transformation damage warm area of Oxide Varistor Ceramic, varistor may be caused to burn short-circuit failure, and (this is also pressure
The quick most common failure phenomenon of resistance).Single independent varistor is since small thermal capacity is low, temperature when being impacted by TOV
Liter is higher, therefore TOV overvoltage tolerance levels are relatively low.For single varistor, " multi-disc unification lightning-protection module " due to
Equivalent thermal capacity is much bigger, and warm increasing degree degree is relatively low, therefore to the tolerance level of TOV transient overvoltages than single pressure-sensitive electricity
It hinders much higher.By taking single 20D56IK varistors as an example, 600VAC_10A's (60 Ω internal resistances) is carried out to single varistor
TOV impact tests, the time that varistor excess temperature burns failure are 2S or so, and it is about 2000J to burn energy value；By three
" lightning-protection module of three varistor integrations welding " of 20D56IK varistors composition, carries out the TOV punchings of similarity condition
It hits, the time that lightning-protection module excess temperature burns failure is 5S or so, and it is about 6000J to burn energy value.It can be seen that " three varistors one
The TOV energy tolerance levels of the lightning-protection module of bodyization welding " are 3 times of single varistor, and effect promoting is clearly.
Only multiple varistors of entire lightning-protection module can be given to provide excess temperature failure with two excess temperature releasing mechanisms to protect
Shield.This is not only to save a Thermal Cutoffs, and can only be monitored with indicating circuit with the detection of a set of fuse
And indicate whether two excess temperature tripping mechanisms have acted failure.And traditional use 3 " thermal tripping type varistor " is anti-
Thunder scheme is needed to be monitored respectively with indicating circuit using 3 sets of separate monitorings and whether to indicate each Thermal Cutoffs
The problem of action failure, this not only causes the various reliability of number of elements to reduce, but also many PCB surface products are occupied, it hinders
The miniaturization of schemes of prevention against lightning.
The lightning-protection module of multiple varistor integration welding greatly reduces the volume of lightning protection component.It is adopted relative to tradition
It is only traditional schemes of prevention against lightning with lightning-protection module volume produced by the present invention with the schemes of prevention against lightning of 3 " thermal tripping type varistor "
The 1/2 of lightning protection component total volume.The single-phase 220VAC power grids lightning protection of existing market sale is with " the de- shape of the mouth as one speaks varistor of heat " with valve
The TMOV that a diameter of 20mm operation voltages of piece are 510-620VDC is main product, and the long * wide * high of single varistor are substantially
For：23*11*22 (mm), single TMOV volumes are about 5.6cm3, three TMOV total volumes are about 16.7cm3.And use 3
" lightning-protection module of three varistor integrations welding " of 20D561K varistors composition, long * wide * high are substantially：24*
14*24 (mm), lightning-protection module volume are 8.1cm3.It can be seen that advantage of the Integral lightning protection module in volume is apparent.This is anti-
The Miniaturization Design of thunder scheme creates very favorable condition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of varistor module, which is characterized in that including varistor component and metallic electrode components, the varistor
Component includes the first varistor, the second varistor and third varistor, and the metallic electrode components include the first gold medal
Belong to the third metal electrode of electrode slice, the second metal electrode film and " П " shape, first varistor, first metal
Electrode slice, second varistor, second metal electrode film and the third varistor are cascading shape
At a stackable unit, and the third metal electrode is folded in the outside of the stacking direction of the stackable unit, and the stacking is single
Member is located in the space that the third metal electrode encloses.
2. varistor module as described in claim 1, which is characterized in that the third metal electrode is rushed by thin flat sheet of metal
It presses and bending forming, including fitting is welded on the first electrode inserted sheet on the outside of first varistor, and fitting is welded on institute
The second electrode inserted sheet on the outside of third varistor is stated, and is connected to and one end of the first electrode inserted sheet and second electricity
Connection electrode piece between one end of pole inserted sheet and except the varistor component；The first electrode inserted sheet and described
With second electrode inserted sheet include the varistor component be bonded welding our department and extend to drawing except the stackable unit
Go out end.
3. a kind of lightning-protection module, which is characterized in that including varistor module, the first Thermal Cutoffs described in claims 1 or 2
Component and second temperature fuse component；The first Thermal Cutoffs component and the second temperature fuse component are pasted respectively
The varistor module is located in the two opposite outer of the stacking direction.
4. lightning-protection module as claimed in claim 3, which is characterized in that the first Thermal Cutoffs component has the first pin
And second pin, power firestreak input terminal of first pin as lightning-protection module, the second pin and first metal
Electrode slice is connected to；The second temperature fuse component has third pin and the 4th pin, and the third pin is as lightning protection mould
The zero-power line input terminal of block, the 4th pin are connected to second metal electrode film；The third metal electrode is as anti-
The grounding pin of thunder module.
5. lightning-protection module as described in claim 3 or 4, which is characterized in that the first Thermal Cutoffs component and the second temperature
Degree fuse component includes the ceramic shell and two elastic metallic leads being arranged in the cavity of part for having cavity, and two
Welded together with low-temperature alloy scolding tin after the top bend by pressure deformation of elastic metallic lead described in root and is housed in the sky
Intracavitary, and the top of two elastic metallic leads when pad melts can back movement, two elastic metallics draw
The respective other end of line exposes to the ceramic shell as two pins, and the ceramic shell is sticked in the varistor mould
Block is in the outside of the stacking direction.
6. lightning-protection module as claimed in claim 5, which is characterized in that the ceramic shell include ceramic base and with the pottery
The ceramic coping that porcelain base cover is closed, the ceramic shell offer the through-hole through the ceramic base and the ceramic coping,
The third metal electrode is equipped with the blade for being pierced by the through-hole in the two opposite outer surface of the stacking direction, by institute
State the outer surface that ceramic shell is fixed and is tightly attached to the third metal electrode.
7. a kind of varistor module, which is characterized in that including varistor component and metallic electrode components, the varistor
Component includes the first varistor, the second varistor, third varistor and the 4th varistor, the metallic electrode components
The 4th metal electrode including the first metal electrode film, the second metal electrode film, third metal electrode film and " П " shape, it is described
First metal electrode film, first varistor, second varistor, second metal electrode film, the third
Varistor, the 4th varistor, second metal electrode film and the third metal electrode film are stacked gradually and are set
It sets to form a stackable unit, and one end of the 4th metal electrode is folded in first varistor and described second pressure-sensitive
Between valve block, the other end of the 4th metal electrode be folded in the third varistor and the 4th varistor it
Between.
8. varistor module as claimed in claim 7, which is characterized in that the 4th metal electrode is rushed by thin flat sheet of metal
It presses and bending forming, including fitting is welded on the first electrode between first varistor and second varistor and inserts
Piece, and fitting are welded on the second electrode inserted sheet between the third varistor and the 4th varistor, and are connected to
Between one end and one end of the second electrode inserted sheet of the first electrode inserted sheet and positioned at the varistor component it
Outer connection electrode piece.
9. a kind of lightning-protection module, which is characterized in that including the varistor module described in claim 7 or 8, the first Temperature protection
Silk component and second temperature fuse component；The first Thermal Cutoffs component is sticked in first metal electrode film in institute
The outside of stackable unit stacking direction is stated, the second temperature fuse component is sticked in the third metal electrode film in described
The outside of stacking direction.
10. lightning-protection module as claimed in claim 9, which is characterized in that the first Thermal Cutoffs component has first to draw
Foot and second pin, power firestreak input terminal of first pin as lightning-protection module, the second pin and first gold medal
Belong to electrode slice connection；The second temperature fuse component has third pin and the 4th pin, and the third pin is as lightning protection
The zero-power line input terminal of module, the 4th pin are connected to the third metal electrode film；Second metal electrode film is made
For the grounding pin of lightning-protection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259896.3A CN108461240A (en) | 2018-03-27 | 2018-03-27 | A kind of varistor module and lightning-protection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259896.3A CN108461240A (en) | 2018-03-27 | 2018-03-27 | A kind of varistor module and lightning-protection module |
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| Publication Number | Publication Date |
|---|---|
| CN108461240A true CN108461240A (en) | 2018-08-28 |
Family
ID=63237999
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810259896.3A Withdrawn CN108461240A (en) | 2018-03-27 | 2018-03-27 | A kind of varistor module and lightning-protection module |
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| Country | Link |
|---|---|
| CN (1) | CN108461240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149545A (en) * | 2018-11-15 | 2019-01-04 | 电安科技（嘉兴）有限公司 | Surge protector |
-
2018
- 2018-03-27 CN CN201810259896.3A patent/CN108461240A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149545A (en) * | 2018-11-15 | 2019-01-04 | 电安科技（嘉兴）有限公司 | Surge protector |
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Application publication date: 20180828 |