CN203434622U - Lightning protection overvoltage protection component - Google Patents
Lightning protection overvoltage protection component Download PDFInfo
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- CN203434622U CN203434622U CN201320382707.4U CN201320382707U CN203434622U CN 203434622 U CN203434622 U CN 203434622U CN 201320382707 U CN201320382707 U CN 201320382707U CN 203434622 U CN203434622 U CN 203434622U
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Abstract
The utility model discloses a lightning protection overvoltage protection component which comprises a piezoresistive piece, a positive temperature coefficient thermistor piece and a gas discharge tube. The piezoresistive piece, the positive temperature coefficient thermistor piece and the gas discharge tube can be packaged into a whole body. The first public ends of the positive temperature coefficient thermistor piece and the gas discharge tube are first lead out ends. The second public ends of the positive temperature coefficient thermistor piece and the gas discharge tube are connected with one end of the piezoresistive piece, and the other end of the piezoresistive piece is a second lead out end. According to the utility model, operation overvoltage and fault power frequency overvoltage can be inhibited; and when lightning impulse overvoltage occurs, the protection component can play a protection role of a normal voltage-sensitive element.
Description
Technical field
The utility model relates to lightning protection over-voltage protection technology, particularly a kind of compound lightning protection overvoltage protective module.
Background technology
ZnO pressure cell is in a large number for power electronic circuits, absorbs the power-frequency overvoltage that overvoltage that lightening pulse causes and system operation and the system failure cause.But, pressure cell itself absorbs surge energy certain limit, the pressure cell being connected in parallel on electric power loop absorbs overvoltage energy (particularly long-term power-frequency overvoltage) simultaneously, self temperature raises, when the energy that absorbs when piezo-resistance is excessive, piezo-resistance may be blasted on fire, generally by improving pressure sensitive voltage and the diameter of piezo-resistance, solve this problem now, but so just reduced to a certain extent the protection effect of varistor absorption surge voltage, pulse residual voltage must raise, nor can prevent the piezo-resistance accident on fire of blasting 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 combination can be played comprehensive over-current over-voltage protection effect.
Existing document: " Lu Zhenya, the applied in any combination of varistor and PTCR thermistor, electronic component and material, 1997.12 " have openly reported some result of the tests of varistor and PTC themistor applied in any combination.
Utility model patent 200720049371.4 and 201220290529.8 discloses a kind of composite positive temperature coefficient thermistor, by PTC thermistor and piezo-resistance are packaged together, be made into three ends and draw device, during application, PTC temperature-sensitive element is connected with protected circuit, pressure cell is in parallel with protected circuit, electric current and temperature (thermal coupling effect) while utilizing piezo-resistance overvoltage response improve the protection speed of PTC thermistor, and protect conversely piezo-resistance; While 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, protected circuit rated operational current can only be limited in element non-operating current, and this has just limited the range of application that above-mentioned existing three ends are drawn assembling device.
Also the gap (general air gap or gas discharge tube) of can connecting while adopting ZnO pressure cell as overvoltage lightning protection, a similar band gap electric lightning.Apply with gap series; can prevent ZnO pressure cell ageing failure; but can improve the starting voltage that punctures of circuit; 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 of switching overvoltage and fault power-frequency overvoltage destruction; Adopt the three terminal device of PTC temperature-sensitive element and the combination of ZnO pressure cell 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 application, can prevent the aging deflagration accident having causing of pressure cell long-term load, but circuit operation overvoltage and fault power-frequency overvoltage protective capability are reduced.
Utility model content
In order to overcome the above-mentioned shortcoming and deficiency of prior art; the purpose of this utility model is to provide a kind of lightning protection overvoltage protective module; not only can suppress switching overvoltage and fault power-frequency overvoltage, when there is thunderbolt pulse surge, can the bring into normal play protective effect of pressure cell of this protection assembly.
The purpose of this utility model is achieved through the following technical solutions:
A kind of lightning protection overvoltage protective module, comprise piezoresistive wafer, semistor sheet and gas discharge tube, described piezoresistive wafer, semistor sheet and gas discharge tube are packaged as a whole, the first common port of semistor sheet and gas discharge tube is the first exit, the second common port of semistor sheet and gas discharge tube is connected with one end of piezoresistive wafer, and the other end of piezoresistive wafer is the second exit; After semistor sheet and gas discharge tube parallel connection, connect with piezoresistive wafer; Described semistor sheet and piezoresistive wafer form thermal coupling relation.
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 and the pole-face that powers on of piezoresistive wafer weld by scolding tin; Gas discharge tube is placed in the endoporus of semistor sheet, and the pole-face that powers on of its lower surface and piezoresistive wafer welds by scolding tin; 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 the 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 and the pole-face that powers on of piezoresistive wafer weld by scolding tin; Gas discharge tube is positioned at a side of zinc oxide varistor, and the pole-face that powers on of its lower surface and piezoresistive wafer welds by scolding tin; 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 the second lead-in wire also welds with the upper surface of gas discharge tube simultaneously.
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 utlity model has following advantage and beneficial effect:
The utility model 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, can the bring into normal play protective effect of pressure cell of this protection assembly:
(1) when supply voltage is normal, lightning protection overvoltage protective module of the present utility model does not have electric current (or only having fine leak electric current) to flow through, and protected Circuits System normal operation is unaffected.
(2) when thunderbolt causes protected Circuits System pulse surge; lightning protection overvoltage protective module action of the present utility model; pulse current is through the series loop of pressure cell and gas discharge tube, and the pulse surge that protected circuit bears is controlled within the pulse residual voltage of pressure cell and gas discharge tube series loop (being pulse residual voltage and the gas discharge tube conducting residual voltage sum of pressure cell).
(3) if piezo-resistance long-term load makes performance degradation, the lower leakage current increase of normal voltage load causes temperature to raise, heat is delivered on thermistor, when temperature reaches the Curie temperature of thermistor, thermistor action, thermistor resistance sharply raises, and has limited the electric current of piezo-resistance, prevents the generation of piezo-resistance deflagration accident having.
(4) when there is power-frequency overvoltage in power circuit, piezo-resistance conducting, On current flows through through thermistor, absorbs overvoltage energy, within the voltage that protected Circuits System is born is limited in piezo-resistance and thermistor series loop voltage drop.
Accompanying drawing explanation
Fig. 1 is that the lightning protection overvoltage protective module inner member of embodiment 1 forms schematic diagram.
Fig. 2 is each component profile schematic diagram of Fig. 1.
Fig. 3 is the overall schematic of the lightning protection overvoltage protective module of embodiment 1.
Fig. 4 is the inner member connection diagram of the lightning protection overvoltage protective module of embodiment 1.
Fig. 5 is that the lightning protection overvoltage protective module inner member of embodiment 2 forms schematic diagram.
Fig. 6 is each component profile schematic diagram of Fig. 5.
Fig. 7 is the assembling schematic diagram of the lightning protection overvoltage protective module of embodiment 2.
Fig. 8 is the inner member connection diagram of the lightning protection overvoltage protective module of embodiment 2.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment 1
As shown in Fig. 1～2, the lightning protection overvoltage protective module 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 coordinates with the external diameter of gas discharge tube 13, and 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 and the pole-face that powers on of zinc oxide varistor 11 weld by scolding tin, gas discharge tube 13 is placed in the endoporus of ceramic positive temperature coefficient thermistor sheet 12, and the pole-face that powers on of the lower surface of gas discharge tube 13 and zinc oxide varistor 11 welds by scolding tin; It is cylinder that three elements weld together rear outward appearance, the bottom electrode face that end face of cylinder is zinc oxide varistor, another end face be ceramic positive temperature coefficient thermistor sheet annular electro pole-face and with the upper surface of the substantially contour gas discharge tube of this annular electro pole-face.After this adopt traditional disk electronic ceramic element production technology, 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 simultaneously and the welding of gas discharge tube upper surface, the lower lead-in wire in the bottom electrode face welding of zinc oxide varistor as exit 15.After welding lead, adopt epoxy resin enclosed, solidify, make the lightning protection overvoltage protective module with two exits 14～15 as shown in Figure 3.
Fig. 4 is the inner member connection diagram of the lightning protection overvoltage protective module of the present embodiment, after ceramic positive temperature coefficient thermistor sheet 12 and gas discharge tube in parallel 13, connects with zinc oxide varistor 11, and in figure, dotted line frame 16 represents encapsulated layer.
The utility model is ceramic positive temperature coefficient thermistor sheet and piezoresistive wafer formation thermal coupling relation in use, and exit 14 and exit 15 are connected in parallel on protected power circuit.
The Curie temperature of the semistor sheet of lightning protection overvoltage protective module inside is chosen as (95～125 ℃), and room temperature resistance is chosen as (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.
Select diameter/thickness to be about 14.0/1.8mm, pressure sensitive voltage V
1mAthe voltage dependent resistor chip of=430V ± 10%; Select external diameter/internal diameter // thickness to be about 14.0/5.5/5.0mm; 30～50 ohm of room temperature (25 ℃) resistances; Curie temperature is the semistor chip of 120 ℃; select diameter/highly for 5/5mm; DC breakdown voltage is the gas discharge tube of 550～600V; 5, the lightning protection overvoltage protective module sample of making the present embodiment, carries out power-frequency overvoltage and the test of simulation Lightning Over-voltage 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 is that 1.2/50 μ s, port short circuit current waveform are 8/20 μ s), test voltage current peak is set to 6kV/3kA, every sample direct impulse is tested 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) 5 of commercially available Zinc-oxide piezoresistors, carry out identical test.Test result is in Table 1.
From table 1 test result, find out, 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 the utility model sample 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 lightning protection overvoltage protective module 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; the overall dimension of piezoresistive wafer, thermosensitive resistor film and gas discharge tube needs suitably to coordinate: the gas discharge tube specification of employing is identical with embodiment 1; the piezoresistive wafer adopting be of a size of the wide * of long * high=15*15*3mm, the thermosensitive resistor film overall dimension of employing for the wide * of long * high=15*9*5mm.The bottom electrode face of semistor sheet 22 and the pole-face that powers on of zinc oxide varistor 21 weld by scolding tin; Gas discharge tube 23 is positioned at a side of zinc oxide varistor 21, and the pole-face that powers on of its lower surface and zinc oxide varistor 21 welds by scolding tin.After this welding lead: as shown in Figure 7, electrode surface at ceramic positive temperature coefficient thermistor sheet welds the upper lead-in wire as exit 24, upper lead-in wire simultaneously and the welding of gas discharge tube upper surface, the lower lead-in wire in the bottom electrode face welding of zinc oxide varistor as exit 25; Through plastic housing encapsulation, form lightning protection overvoltage protective module again.
The inner member of the lightning protection overvoltage protective module of the present embodiment connects as shown in Figure 8, after semistor sheet 22 and gas discharge tube in parallel 23, connects with zinc oxide varistor 21, and in figure, dotted line frame 26 represents encapsulated layer.The method of testing of the present embodiment is identical with embodiment 1, and test result and embodiment 1 are basically identical.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (4)
1. a lightning protection overvoltage protective module; it is characterized in that; comprise piezoresistive wafer, semistor sheet and gas discharge tube; described piezoresistive wafer, semistor sheet and gas discharge tube are packaged as a whole; the first common port of semistor sheet and gas discharge tube is the first exit; the second common port of semistor sheet and gas discharge tube is connected with one end of piezoresistive wafer, and the other end of piezoresistive wafer is the second exit.
2. lightning protection overvoltage protective module according to claim 1, is characterized in that, 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 and the pole-face that powers on of piezoresistive wafer weld by scolding tin; Gas discharge tube is placed in the endoporus of semistor sheet, and the pole-face that powers on of its lower surface and piezoresistive wafer welds by scolding tin; 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 the second lead-in wire is also connected with the upper surface of gas discharge tube simultaneously.
3. lightning protection overvoltage protective module according to claim 1, is characterized in that, described piezoresistive wafer, semistor sheet are square; The bottom electrode face of semistor sheet and the pole-face that powers on of piezoresistive wafer weld by scolding tin; Gas discharge tube is positioned at a side of zinc oxide varistor, and the pole-face that powers on of its lower surface and piezoresistive wafer welds by scolding tin; 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 the second lead-in wire also welds with the upper surface of gas discharge tube simultaneously.
4. according to the lightning protection overvoltage protective module described in claim 1～3 any one, it is characterized in that, described piezoresistive wafer is zinc oxide varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382707.4U CN203434622U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection component |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382707.4U CN203434622U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection component |
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| CN203434622U true CN203434622U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320382707.4U Expired - Fee Related CN203434622U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection component |
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| CN (1) | CN203434622U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337848A (en) * | 2013-06-28 | 2013-10-02 | 华南理工大学 | Anti-thunder overvoltage protection component |
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2013
- 2013-06-28 CN CN201320382707.4U patent/CN203434622U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337848A (en) * | 2013-06-28 | 2013-10-02 | 华南理工大学 | Anti-thunder overvoltage protection component |
| CN103337848B (en) * | 2013-06-28 | 2016-01-06 | 华南理工大学 | A kind of anti-thunder overvoltage protection component |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20170628 |