CN203434621U - Lightning protection overvoltage protection device - Google Patents
Lightning protection overvoltage protection device Download PDFInfo
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- CN203434621U CN203434621U CN201320382643.8U CN201320382643U CN203434621U CN 203434621 U CN203434621 U CN 203434621U CN 201320382643 U CN201320382643 U CN 201320382643U CN 203434621 U CN203434621 U CN 203434621U
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- gas discharge
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- discharge tube
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Abstract
The utility model discloses a lightning protection overvoltage protection device which comprises a piezoresistive piece, a positive temperature coefficient thermistor piece and a gas discharge tube. The piezoresistive piece and the positive temperature coefficient thermistor piece are packaged into a whole body to form a package body. One end of the positive temperature coefficient thermistor piece is a first lead out end. The other end of the positive temperature coefficient thermistor piece is connected with one end of the piezoresistive piece to form a public end. The public end is used as a third lead out end. The other end of the piezoresistive piece is used as a second lead out end. The gas discharge tube is located outside the package body. Both ends of the gas discharge tube are respectively connected with the first lead out end and the third 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 over-voltage protector.
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 over-voltage protector; 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:
Lightning protection over-voltage protector, comprise piezoresistive wafer, semistor sheet and gas discharge tube, described piezo-resistance and semistor sheet are packaged as a whole, and form packaging body, and one end of described semistor sheet is the first exit; The other end of semistor sheet is connected with one end of piezoresistive wafer, forms common port, and 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 respectively the first exit and three terminal; After described semistor sheet and gas discharge tube parallel connection, connect with piezoresistive wafer; Described semistor sheet and piezoresistive wafer form thermal coupling relation.
An electrode welding lead-in wire of described semistor sheet, as the first exit; An electrode of the another side electrode of ceramic positive temperature coefficient thermistor sheet and piezoresistive wafer welds together by scolding tin, forms common port, simultaneously as three terminal; The another side electrode welding lead-in wire of piezoresistive wafer is the second exit; After semistor sheet, piezoresistive wafer encapsulation, form the packaging body with three exits; Between the first exit and three terminal, connect gas discharge tube.
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 over-voltage protector 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 over-voltage protector 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 the overall schematic of the lightning protection over-voltage protector of embodiment of the present utility model.
Fig. 2 is the inner member connection diagram of lightning protection over-voltage protector of the embodiment of utility model.
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
The lightning protection over-voltage protector of the present embodiment comprises zinc oxide varistor 11, semistor sheet 12 and gas discharge tube 13.As shown in Figure 1, an electrode welding lead-in wire of semistor sheet 12, is exit 14; An electrode of the another side electrode of ceramic positive temperature coefficient thermistor sheet 12 and zinc oxide varistor 11 welds together by scolding tin, forms common port, simultaneously as exit 16; The another side electrode welding lead-in wire of zinc oxide varistor 11 is exit 15.Zinc oxide varistor 11, semistor sheet 12 form packaging body after sealing epoxy resin, solidifying; gas discharge tube two ends are connected respectively to exit 14 and exit 16; the lightning protection over-voltage protector that forms the present embodiment, during use, exit 14 and exit 15 are connected in parallel on protected power circuit.
The inner member of the lightning protection over-voltage protector of the present embodiment connects as shown in Figure 2, after semistor sheet 12 and gas discharge tube in parallel 13, connects with zinc oxide varistor 11, and in figure, dotted line frame 17 represents encapsulated layer.
The Curie temperature of the semistor sheet of lightning protection over-voltage protector 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 over-voltage protector 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
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 (3)
1. lightning protection over-voltage protector, is characterized in that, comprises piezoresistive wafer, semistor sheet and gas discharge tube, and described piezoresistive wafer and semistor sheet are packaged as a whole, and forms 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, forms common port, and 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 respectively the first exit and three terminal.
2. lightning protection over-voltage protector according to claim 1, is characterized in that, an electrode welding lead-in wire of described semistor sheet, as the first exit; An electrode of the another side electrode of ceramic positive temperature coefficient thermistor sheet and piezoresistive wafer welds together by scolding tin, forms common port, simultaneously as three terminal; The another side electrode welding lead-in wire of piezoresistive wafer is the second exit; After semistor sheet, piezoresistive wafer encapsulation, form the packaging body with three exits; Between the first exit and three terminal, connect gas discharge tube.
3. according to the lightning protection over-voltage protector described in claim 1～2 any one, it is characterized in that, described piezoresistive wafer is zinc oxide varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382643.8U CN203434621U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382643.8U CN203434621U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203434621U true CN203434621U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320382643.8U Expired - Fee Related CN203434621U (en) | 2013-06-28 | 2013-06-28 | Lightning protection overvoltage protection device |
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| CN (1) | CN203434621U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311916A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | Thunder-prevention overvoltage protection device |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
-
2013
- 2013-06-28 CN CN201320382643.8U patent/CN203434621U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311916A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | Thunder-prevention overvoltage protection device |
| CN103311916B (en) * | 2013-06-28 | 2016-09-28 | 华南理工大学 | Thunder-prevention overvoltage protection device |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
| CN110336264B (en) * | 2019-08-22 | 2024-01-26 | 成都铁达电子股份有限公司 | Voltage limiting circuit |
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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 |
Granted publication date: 20140212 Termination date: 20170628 |
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| CF01 | Termination of patent right due to non-payment of annual fee |