CN103346547B - A kind of Thunder-prevention overvoltage protection device - Google Patents
A kind of Thunder-prevention overvoltage protection device Download PDFInfo
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- CN103346547B CN103346547B CN201310268111.6A CN201310268111A CN103346547B CN 103346547 B CN103346547 B CN 103346547B CN 201310268111 A CN201310268111 A CN 201310268111A CN 103346547 B CN103346547 B CN 103346547B
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Abstract
The invention discloses a kind of Thunder-prevention overvoltage protection device, comprise piezoresistive wafer, semistor sheet and gas discharge tube, connect with piezoresistive wafer after described semistor sheet and gas discharge tube parallel connection; Described semistor sheet and piezoresistive wafer form thermal coupling relation.Described piezoresistive wafer, semistor sheet and gas discharge tube can be packaged as a whole or piezoresistive wafer and semistor sheet are packaged as a whole, and form packaging body, gas discharge tube is positioned at outside packaging body.The present invention not only can suppress switching overvoltage and fault power-frequency overvoltage, and when there is thunderbolt pulse surge, this protection assembly can be brought into normal play the protective effect of pressure cell.
Description
Technical field
The present invention relates to lightning protection over-voltage protection technology, particularly a kind of compound Thunder-prevention overvoltage protection device.
Background technology
ZnO pressure cell is a large amount of for power electronic circuits, absorbs the power-frequency overvoltage that the overvoltage that causes of lightening pulse and Dynamic System and the system failure cause.But, pressure cell itself absorbs surge energy certain limit, the pressure cell be connected in parallel on electric power loop absorbs overvoltage energy (particularly long-term power-frequency overvoltage) simultaneously, own temperature raises, when the energy that piezo-resistance absorbs is excessive, piezo-resistance may be blasted on fire, pressure sensitive voltage and diameter now generally by improving piezo-resistance solve this problem, but so just reduce the protected effect that varistor absorbs surge voltage to a certain extent, pulse residual voltage must raise, nor can prevent piezo-resistance to blast accident on fire at all.
Positive temperature coefficient (PTC) thermistor is connected on electronic product power source loop, can play overcurrent protection.Positive temperature coefficient (PTC) thermistor and piezo-resistance combine and can play comprehensive over-current over-voltage protection effect.
Existing document: " Lu Zhenya, the Combination application of varistor and PTCR thermistor, electronic component and material, 1997.12 " openly report some result of the tests of varistor and PTC themistor Combination application.
Patent of invention 200720049371.4 and 201220290529.8 discloses a kind of composite positive temperature coefficient thermistor, be made into three ends by PTC thermistor and piezo-resistance being packaged together and draw device, PTC temperature-sensitive element and protected circuit connected in series during application, pressure cell and protected circuit in parallel, electric current when utilizing piezo-resistance overvoltage to respond and temperature (thermal coupling effect) improve the protection speed of PTC thermistor, and protect piezo-resistance conversely; When utilizing PTC thermistor and piezo-resistance thermal coupling, the integrated protection effect of current/voltage improves the protection speed of PTC thermistor to greatest extent.
But because PTC temperature-sensitive element has certain resistance, can only bear less electric current and flow through, within protected circuit rated operational current can only be limited in element non-operating current, this just limits the range of application that above-mentioned existing three ends draw assembling device.
Adopt ZnO pressure cell as a gap (general air gap or gas discharge tube) of also can connecting during overvoltage lightning protection, a similar band gap electric lightning.Apply with gap series; ZnO pressure cell ageing failure can be prevented; but that can improve circuit punctures starting voltage; when switching overvoltage (power-frequency overvoltage) amplitude does not reach puncture voltage (ZnO element puncture voltage and gap breakdown voltage sum); element does not have electric current to flow through, and can not shield to circuit.
In sum, in order to reduce pressure cell power frequency overvoltage deflagration accident having probability, can improve the pressure sensitive voltage of pressure cell, but must improve pulse residual voltage like this, protected circuit is increased greatly by the probability that switching overvoltage and fault power-frequency overvoltage are destroyed; The three terminal device adopting PTC temperature-sensitive element and ZnO pressure cell to combine can reduce pressure cell power frequency overvoltage deflagration accident having probability, can realize lower pulse residual voltage, but the rated operational current of protected circuit is restricted simultaneously; Adopt ZnO pressure cell and gap series to apply, the aging deflagration accident having caused of pressure cell long-term load can be prevented, but circuit operation overvoltage and fault power-frequency overvoltage protective capability are reduced.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough; the object of the present invention is to provide a kind of Thunder-prevention overvoltage protection device; not only can suppress switching overvoltage and fault power-frequency overvoltage, when there is thunderbolt pulse surge, this protection assembly can be brought into normal play the protective effect of pressure cell.
Object of the present invention is achieved through the following technical solutions:
A kind of Thunder-prevention overvoltage protection device, comprises piezoresistive wafer, semistor sheet and gas discharge tube, connects after described semistor sheet and gas discharge tube parallel connection with piezoresistive wafer; Described semistor sheet and piezoresistive wafer form thermal coupling relation.
Described piezoresistive wafer, semistor sheet and gas discharge tube are packaged as a whole, first common port of semistor sheet and gas discharge tube is the first exit, semistor sheet is connected with one end of piezoresistive wafer with the second common port of gas discharge tube, and the other end of piezoresistive wafer is the second exit.
Described semistor sheet is loop configuration, the interior hole size of semistor sheet and matching of gas discharge tube; The bottom electrode face of semistor sheet is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; Gas discharge tube is placed in the endoporus of semistor sheet, and its lower surface is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; The bottom electrode face of described piezoresistive wafer is welded with the first lead-in wire as the first exit; The pole-face that powers on of described semistor sheet is welded with the second lead-in wire as the second exit, and described second lead-in wire is also connected with the upper surface of gas discharge tube simultaneously.
Described piezoresistive wafer, semistor sheet are square; The bottom electrode face of semistor sheet is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; Gas discharge tube is positioned at the side of zinc oxide varistor, and its lower surface is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; The bottom electrode face of described piezoresistive wafer is welded with the first lead-in wire as the first exit; The pole-face that powers on of described semistor sheet is welded with the second lead-in wire as the second exit, and described second lead-in wire also welds with the upper surface of gas discharge tube simultaneously.
Described piezoresistive wafer and semistor sheet are packaged as a whole, and form packaging body, one end of described semistor sheet is the first exit; The other end of semistor sheet is connected with one end of piezoresistive wafer, and form common port, described common port is as three terminal; The other end of piezoresistive wafer is as the second exit; Gas discharge tube is positioned at outside packaging body, and the two ends of gas discharge tube connect the first exit and three terminal respectively.
An electrode welding lead-in wire of described semistor sheet, as the first exit; The another side electrode of ceramic positive temperature coefficient thermistor sheet and an electrode of piezoresistive wafer are welded together by scolding tin, form common port, simultaneously as three terminal; The another side electrode welding lead-in wire of piezoresistive wafer is the second exit; After the encapsulation of semistor sheet, piezoresistive wafer, form the packaging body with three exits; Gas discharge tube is connected between the first exit and three terminal.
Described being encapsulated as adopts plastic housing encapsulation or adopts the encapsulation of anti-flammability organic resin material.
Described piezoresistive wafer is zinc oxide varistor.
Compared with prior art, the present invention has the following advantages and beneficial effect:
The present invention in use the first exit and the second exit is connected in parallel on protected power circuit; not only can suppress switching overvoltage and fault power-frequency overvoltage; when there is thunderbolt pulse surge, this protection assembly can be brought into normal play the protective effect of pressure cell:
(1) when supply voltage is normal, Thunder-prevention overvoltage protection device of the present invention does not have electric current (or only having fine leak electric current) to flow through, and protected Circuits System normally works unaffected.
(2) when thunderbolt causes protected Circuits System pulse surge; Thunder-prevention overvoltage protection device action of the present invention; pulse current through the series loop of pressure cell and gas discharge tube, within the pulse residual voltage that the pulse surge that protected circuit bears is controlled in pressure cell and gas discharge tube series loop (i.e. the pulse residual voltage of pressure cell and gas discharge tube conducting residual voltage sum).
(3) if piezo-resistance long-term load makes performance degradation, under normal voltage load, leakage current increase causes temperature to raise, heat is delivered on thermistor, when temperature reaches the Curie temperature of thermistor, thermistor action, thermistor resistance sharply raises, and limits the electric current of piezo-resistance, prevents the generation of piezo-resistance deflagration accident having.
(4) when power-frequency overvoltage appears in power circuit, piezo-resistance conducting, On current flows through through thermistor, and absorb overvoltage energy, the voltage that protected Circuits System is born is limited within piezo-resistance and thermistor series loop voltage drop.
Accompanying drawing explanation
Fig. 1 is the Thunder-prevention overvoltage protection device inner member composition schematic diagram of embodiment 1.
Fig. 2 is each component profile schematic diagram of Fig. 1.
Fig. 3 is the overall schematic of the Thunder-prevention overvoltage protection device of embodiment 1.
Fig. 4 is the inner member connection diagram of the Thunder-prevention overvoltage protection device of embodiment 1.
Fig. 5 is the Thunder-prevention overvoltage protection device inner member composition schematic diagram of embodiment 2.
Fig. 6 is each component profile schematic diagram of Fig. 5.
Fig. 7 is the assembling schematic diagram of the Thunder-prevention overvoltage protection device of embodiment 2.
Fig. 8 is the inner member connection diagram of the Thunder-prevention overvoltage protection device of embodiment 2.
Fig. 9 is the overall schematic of the Thunder-prevention overvoltage protection device of embodiment 3.
Figure 10 is the inner member connection diagram of the Thunder-prevention overvoltage protection device of embodiment 3.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Fig. 1 ~ 2, the Thunder-prevention overvoltage protection device of the present embodiment, comprise zinc oxide varistor 11, ceramic positive temperature coefficient thermistor sheet 12 and gas discharge tube 13, described ceramic positive temperature coefficient thermistor sheet 12 is made into loop configuration, the interior hole size of ceramic positive temperature coefficient thermistor sheet 12 and the major diameter fit of gas discharge tube 13, gap is between the two 0.1 ~ 1mm; The thickness of ceramic positive temperature coefficient thermistor sheet 12 is highly consistent with gas discharge tube 13, and zinc oxide varistor 11 is consistent with the external diameter of ceramic positive temperature coefficient thermistor sheet 12; The bottom electrode face of ceramic positive temperature coefficient thermistor sheet 12 is welded by scolding tin with the pole-face that powers on of zinc oxide varistor 11, gas discharge tube 13 is placed in the endoporus of ceramic positive temperature coefficient thermistor sheet 12, and the lower surface of gas discharge tube 13 is welded by scolding tin with the pole-face that powers on of zinc oxide varistor 11; It is cylinder that three elements weld together rear outward appearance, cylinder end face is the bottom electrode face of zinc oxide varistor, and another end face is the annular electro pole-face of ceramic positive temperature coefficient thermistor sheet and the upper surface of the gas discharge tube substantially contour with this annular electro pole-face.After this traditional disk electronic ceramic component production technology is adopted, at above-mentioned cylinder two sides welding lead: at the upper lead-in wire of pole-face welding as exit 14 that power on of ceramic positive temperature coefficient thermistor sheet, upper lead-in wire welds with gas discharge tube upper surface simultaneously, at the lower lead-in wire of the bottom electrode face of zinc oxide varistor welding as exit 15.Adopt epoxy resin enclosed, solidification after welding lead, namely make the Thunder-prevention overvoltage protection device with two exits 14 ~ 15 as shown in Figure 3.
Fig. 4 is the inner member connection diagram of the Thunder-prevention overvoltage protection device of the present embodiment, and connect with zinc oxide varistor 11 after ceramic positive temperature coefficient thermistor sheet 12 and gas discharge tube in parallel 13, in figure, dotted line frame 16 represents encapsulated layer.
The present invention in use ceramic positive temperature coefficient thermistor sheet and piezoresistive wafer forms thermal coupling relation, and exit 14 and exit 15 are connected in parallel on protected power circuit.
The Curie temperature of the semistor sheet of Thunder-prevention overvoltage protection device inside is chosen as (95 ~ 125 DEG C), and room temperature selectable resistance values is (10 ~ 300 ohm); The pressure sensitive voltage of piezoresistive wafer is chosen as (350 ~ 550V-for 220VAC power supply) or (170 ~ 270V-for 110VAC power supply); The pulse breakdown voltage of gas discharge tube is chosen as 450 ~ 650V.
Diameter/thickness is selected to be about 14.0/1.8mm, pressure sensitive voltage V
1mAthe voltage dependent resistor chip of=430V ± 10%; External diameter/internal diameter // thickness is selected to be about 14.0/5.5/5.0mm; room temperature (25 DEG C) resistance 30 ~ 50 ohm; Curie temperature is the semistor chip of 120 DEG C; select diameter/highly for 5/5mm; DC breakdown voltage is the gas discharge tube of 550 ~ 600V; make 5, the Thunder-prevention overvoltage protection device sample of the present embodiment, power-frequency overvoltage and the test of simulation Lightning Over-voltage are carried out to sample.Power frequency test voltage is 660VAC(3 times of power frequency phase voltage), power supply maximum output current 10A; The test of simulation Lightning Over-voltage adopts assembled pulse wave producer (port open voltage waveform be 1.2/50 μ s, port short circuit current waveform be 8/20 μ s), test voltage current peak is set to 6kV/3kA, every sample direct impulse tests 10 times, 2 minutes, interval, place reverse impulse after 10 minutes and test 10 times, 2 minutes, interval.In order to contrast, choosing specification is 20D821(pressure sensitive voltage V
1mA=750 ~ 800V, chip diameter 20mm) commercially available Zinc-oxide piezoresistor 5, carry out identical test.Test result is in table 1.
Find out from table 1 test result, sample 660VAC power-frequency overvoltage performance prepared by the present embodiment is better than the varistor that specification is 20D821, during pulse current test, the pulse residual voltage of inventive samples is the pulse residual voltage of 20D821 varistor far below specification.
The sample of table 1, the present embodiment and comparative sample power-frequency overvoltage and pulse testing result
Embodiment 2
As shown in Fig. 5 ~ 6; the Thunder-prevention overvoltage protection device of the present embodiment; comprise zinc oxide varistor 21, ceramic positive temperature coefficient thermistor sheet 22 and gas discharge tube 23; zinc oxide varistor 21, semistor sheet 22 are square; piezoresistive wafer, thermosensitive resistor film and the overall dimension of gas discharge tube need suitably to coordinate: the gas discharge tube specification of employing is identical with embodiment 1; the piezoresistive wafer adopted be of a size of the wide * of long * high=15*15*3mm, the thermosensitive resistor film overall dimension of employing be the wide * of long * high=15*9*5mm.The bottom electrode face of semistor sheet 22 is welded by scolding tin with the pole-face that powers on of zinc oxide varistor 21; Gas discharge tube 23 is positioned at the side of zinc oxide varistor 21, and its lower surface is welded by scolding tin with the pole-face that powers on of zinc oxide varistor 21.After this welding lead: as shown in Figure 7, the upper lead-in wire as exit 24 is welded at the electrode surface of ceramic positive temperature coefficient thermistor sheet, upper lead-in wire welds with gas discharge tube upper surface simultaneously, at the lower lead-in wire of the bottom electrode face of zinc oxide varistor welding as exit 25; Thunder-prevention overvoltage protection device is formed again through plastic housing encapsulation.
The inner member of the Thunder-prevention overvoltage protection device of the present embodiment connects as shown in Figure 8, and connect with zinc oxide varistor 21 after semistor sheet 22 and gas discharge tube in parallel 23, in figure, dotted line frame 26 represents encapsulated layer.The method of testing of the present embodiment is identical with embodiment 1, test result and embodiment 1 basically identical.
Embodiment 3
The Thunder-prevention overvoltage protection device of the present embodiment comprises piezoresistive wafer 31, semistor sheet 32 and gas discharge tube 33.As shown in Figure 9, an electrode welding lead-in wire of semistor sheet 32 is exit 34; The another side electrode of ceramic positive temperature coefficient thermistor sheet 32 and an electrode of piezoresistive wafer 31 are welded together by scolding tin, form common port, simultaneously as exit 36; The another side electrode welding lead-in wire of piezoresistive wafer 31 is exit 35.Piezoresistive wafer 31, semistor sheet 32 form packaging body after encapsulating epoxy resin, solidification; gas discharge tube two ends are connected respectively exit 34 and exit 36; form the Thunder-prevention overvoltage protection device of the present embodiment, during use, exit 34 and exit 35 are connected in parallel on protected power circuit.
The inner member of the Thunder-prevention overvoltage protection device of the present embodiment connects as shown in Figure 10, and connect with piezoresistive wafer 31 after semistor sheet 32 and gas discharge tube in parallel 33, in figure, dotted line frame 37 represents encapsulated layer.The method of testing of the Thunder-prevention overvoltage protection device of the present embodiment is identical with embodiment 1, test result and embodiment 1 basically identical.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. a Thunder-prevention overvoltage protection device, is characterized in that, comprises piezoresistive wafer, semistor sheet and gas discharge tube, connects after described semistor sheet and gas discharge tube parallel connection with piezoresistive wafer; Described semistor sheet and piezoresistive wafer form thermal coupling relation;
Described piezoresistive wafer, semistor sheet and gas discharge tube are packaged as a whole;
Described semistor sheet is loop configuration, and the interior hole size of semistor sheet and the external diameter of gas discharge tube match; The bottom electrode face of semistor sheet is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; Gas discharge tube is placed in the endoporus of semistor sheet, and its lower surface is welded by scolding tin with the pole-face that powers on of piezoresistive wafer; The bottom electrode face of described piezoresistive wafer is welded with the first lead-in wire as the first exit; The pole-face that powers on of described semistor sheet is welded with the second lead-in wire as the second exit, and described second lead-in wire is also connected with the upper surface of gas discharge tube simultaneously.
2. Thunder-prevention overvoltage protection device according to claim 1, is characterized in that, described in be encapsulated as and adopt the encapsulation of anti-flammability organic resin material.
3. Thunder-prevention overvoltage protection device according to claim 1, is characterized in that, described piezoresistive wafer is zinc oxide varistor.
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| CN201310268111.6A CN103346547B (en) | 2013-06-28 | 2013-06-28 | A kind of Thunder-prevention overvoltage protection device |
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| CN103346547B true CN103346547B (en) | 2016-03-30 |
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| FR3057403A1 (en) * | 2016-10-10 | 2018-04-13 | Citel | COMPONENT INTEGRATING A THERMOPROTEGED VARIANCE AND A SERIES ECLATOR |
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| CN109412132A (en) * | 2018-10-30 | 2019-03-01 | 成都铁达电子股份有限公司 | A kind of Surge Protector of high safety |
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