CN103311916B - Thunder-prevention overvoltage protection device - Google Patents
Thunder-prevention overvoltage protection device Download PDFInfo
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- CN103311916B CN103311916B CN201310268448.7A CN201310268448A CN103311916B CN 103311916 B CN103311916 B CN 103311916B CN 201310268448 A CN201310268448 A CN 201310268448A CN 103311916 B CN103311916 B CN 103311916B
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- piezoresistive wafer
- exit
- thunder
- protection device
- discharge tube
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Abstract
The invention discloses Thunder-prevention overvoltage protection device, be packaged as a whole including piezoresistive wafer, semistor sheet and gas-discharge tube, described piezoresistive wafer and semistor sheet, 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, 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 the first exit and three terminal respectively.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 to a kind of compound Thunder-prevention overvoltage protection device.
Background technology
ZnO pressure cell has been largely used to power electronic circuits, absorbs overvoltage that lightening pulse causes and is
The power-frequency overvoltage that system operation and the system failure cause.But, pressure cell itself absorbs surge energy one
Fixed limit degree, the pressure cell being connected in parallel on electric power loop absorbs overvoltage energy, and (the particularly persistent period is longer
Power-frequency overvoltage) simultaneously, own temperature raise, when varistor absorb energy excessive time, pressure-sensitive electricity
Resistance is it may happen that on fire from explosion, and typically now pressure sensitive voltage and diameter by improving varistor solves this
One problem, but reduce piezoresistor the most to a certain extent and absorb the protected effect of surge voltage,
Pulse residual voltage necessarily raises, nor can prevent varistor from accident on fire from explosion occurring at all.
Positive temperature coefficient (PTC) critesistor is connected on electronic product power source loop, can play overcurrent protection and make
With.Positive temperature coefficient (PTC) critesistor can play comprehensive over-current over-voltage protection with varistor combination
Effect.
Existing document: " combination application of Lu Zhenya, piezoresistor and PTCR thermal resistor, electronics unit
Part and material, 1997.12 " some reporting piezoresistor and PTC themistor combination application are disclosed
Result of the test.
Utility model patent 200720049371.4 and 201220290529.8 discloses a kind of composite positive temperature degree system
Number critesistor, is fabricated to three ends by PTC thermistor and varistor being packaged together and draws device,
During application, PTC temperature-sensitive element is connected with by protection circuit, and pressure cell is in parallel with by protection circuit, utilizes pressure
Electric current during quick resistance overvoltage response and the protection speed of temperature (thermal coupling effect) raising PTC thermistor,
And protect varistor in turn；When utilizing PTC thermistor and varistor thermal coupling, current/voltage
Integrated protection effect improves the protection speed of PTC thermistor to greatest extent.
But, owing to PTC temperature-sensitive element has certain resistance, less electric current can only be born and flow through, be protected
Within protection circuit rated operational current can only be limited in element non-operating current, this just limits above-mentioned existing three
End draws the range of application of assembling device.
A gap can also be connected (between general air when using ZnO pressure cell as overvoltage lightning protection
Gap or gas-discharge tube), a similar band gap electric lightning.Apply with gap series, be possible to prevent ZnO
Pressure cell ageing failure, but can improve circuit puncture starting voltage, when switching overvoltage (power frequency mistake
Voltage) amplitude is not when reaching breakdown voltage (ZnO element breakdown voltage with gap breakdown voltage sum), unit
Part does not has electric current to flow through, it is impossible to shield circuit.
In sum, in order to reduce pressure cell power frequency overvoltage deflagration accident having probability, pressure cell can be improved
Pressure sensitive voltage, but the most necessarily improve pulse residual voltage, and protected circuit is by switching overvoltage and fault power frequency
The probability that overvoltage is destroyed is greatly increased；Use three end-apparatus of PTC temperature-sensitive element and the combination of ZnO pressure cell
Part can reduce pressure cell power frequency overvoltage deflagration accident having probability, can realize relatively low pulse residual voltage simultaneously, but
It is restricted by the rated operational current of protection circuit；ZnO pressure cell is used to apply with gap series, can
Prevent the aging deflagration accident having caused of pressure cell long-term load, but to circuit operation overvoltage and fault work
Frequently overvoltage protection ability reduces.
Summary of the invention
In order to overcome the disadvantages mentioned above of prior art with not enough, it is an object of the invention to provide a kind of lightning protection
Pressure protection device, not only can suppress switching overvoltage and fault power-frequency overvoltage, and when occurring, thunderbolt pulse is the most electric
During pressure, this protection assembly can be brought into normal play the protective effect of pressure cell.
The purpose of the present invention is achieved through the following technical solutions:
Thunder-prevention overvoltage protection device, including piezoresistive wafer, semistor sheet and gas discharge
Pipe, described varistor and semistor sheet be packaged as a whole, and forms packaging body, described just
One end of temperature coefficient thermistor sheet is the first exit；The other end of semistor sheet with
One end of piezoresistive wafer connects, and forms common port, and described common port is as three terminal；Varistor
The other end of sheet is as the second exit；Gas-discharge tube is positioned at outside packaging body, the two ends of gas-discharge tube
Connect the first exit and three terminal respectively；Described semistor sheet and gas-discharge tube
Connect with piezoresistive wafer after parallel connection；Described semistor sheet and piezoresistive wafer form hot coupling
Conjunction relation.
One electrode welding lead-in wire of described semistor sheet, as the first exit；Positive temperature
The another side electrode of degree coefficient ceramics thermosensitive resistor film is welded on by scolding tin with an electrode of piezoresistive wafer
Together, common port is formed, simultaneously as three terminal；The another side electrode welding lead-in wire of piezoresistive wafer,
It it is the second exit；After the encapsulation of semistor sheet, piezoresistive wafer, formation has three and draws
Go out the packaging body of end；Gas-discharge tube is connected between the first exit and three terminal.
Described being encapsulated as uses 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 the first exit in use and the second exit are connected in parallel on to be protected on power circuit, not only
Switching overvoltage and fault power-frequency overvoltage can be suppressed, when there is thunderbolt pulse surge, this protection group
Part can be brought into normal play the protective effect of pressure cell:
(1) when supply voltage is normal, the Thunder-prevention overvoltage protection device of the present invention does not has electric current (or the most micro-
Weak leakage current) flow through, unaffected by protection circuit system worked well.
(2) when thunderbolt causes by protection circuit system pulses overvoltage, the lightning protection overvoltage protector of the present invention
Part action, pulse current is through the series loop of pressure cell Yu gas-discharge tube, the arteries and veins born by protection circuit
Break through voltage and be controlled in (the most pressure-sensitive unit within the pulse residual voltage of pressure cell and gas-discharge tube series loop
The pulse residual voltage of part turns on residual voltage sum with gas-discharge tube).
(3) if varistor long-term load makes performance degradation, under normal voltage load, leakage current increase is led
Cause temperature raises, and heat is delivered on critesistor, when temperature reaches the Curie temperature of critesistor, temperature-sensitive
Resistance action, critesistor resistance drastically raises, and limits the electric current of varistor, prevents varistor quick-fried
The generation of combustion accident.
(4) when power-frequency overvoltage occurs in power circuit, varistor turns on, and electric conduction flows through critesistor
Flowing through, absorb overvoltage energy, the voltage born by protection circuit system is limited in varistor and temperature-sensitive
Within resistant series loop voltage fall.
Accompanying drawing explanation
Fig. 1 is the overall schematic of the Thunder-prevention overvoltage protection device of embodiments of the invention.
Fig. 2 is the inner member connection diagram of the Thunder-prevention overvoltage protection device of inventive embodiment.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
The Thunder-prevention overvoltage protection device of the present embodiment includes zinc oxide varistor 11, positive temperature coefficient temperature-sensitive
Resistor disc 12 and gas-discharge tube 13.As it is shown in figure 1, the one side electricity of semistor sheet 12
Pole welding lead, for exit 14；The another side electrode of ceramic positive temperature coefficient thermistor sheet 12 and oxidation
One electrode of zinc piezoresistive wafer 11 is welded together by scolding tin, forms common port, simultaneously as extraction
End 16；The another side electrode welding lead-in wire of zinc oxide varistor 11, for exit 15.Zinc oxide pressure
Packaging body is formed after quick resistor disc 11, the encapsulated epoxy resin of semistor sheet 12, solidification,
Gas-discharge tube two ends connect exit 14 and exit 16 respectively, and the lightning protection overvoltage forming the present embodiment is protected
Protecting device, during use, exit 14 and exit 15 are connected in parallel on by protection power circuit.
The inner member of the Thunder-prevention overvoltage protection device of the present embodiment connects as in figure 2 it is shown, positive temperature coefficient is hot
Connect with zinc oxide varistor 11 after quick resistor disc 12 and gas-discharge tube parallel connection 13, dotted line frame in figure
17 represent encapsulated layer.
The Curie temperature of the semistor sheet within Thunder-prevention overvoltage protection device is chosen as
(95～125 DEG C), room temperature resistance is chosen as (10～300 ohm)；The pressure sensitive voltage of piezoresistive wafer is chosen as
(350～550V are used for 220VAC power supply) or (170～270V are used for 110VAC power supply)；Gas-discharge tube
Pulse breakdown voltage be chosen as 450～650V.
Diameter/thickness is selected to be about 14.0/1.8mm, pressure sensitive voltage V1mAThe varistor core of=430V ± 10%
Sheet；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, and selecting diameter/height is 5/5mm, direct current
Breakdown voltage is the gas-discharge tube of 550～600V, makes the Thunder-prevention overvoltage protection device sample 5 of the present embodiment
Only, sample is carried out power-frequency overvoltage and simulation Lightning Over-voltage test.Power frequency test voltage is 660VAC (3
Times power frequency phase voltage), power supply maximum output current 10A；Simulation Lightning Over-voltage test uses assembled pulse ripple
Generator (port open voltage waveform be 1.2/50 μ s, port short circuit current waveform be 8/20 μ s), test electricity
Current voltage peak value is set to 6kV/3kA, and every sample direct impulse is tested 10 times, is spaced 2 minutes, places
After 10 minutes, reverse impulse is tested 10 times, is spaced 2 minutes.In order to contrast, choosing specification is 20D821 (pressure
Quick voltage V1mA=750～800V, chip diameter 20mm) commercially available Zinc-oxide piezoresistor 5, carry out
Identical test.Test result is shown in Table 1.
Finding out from table 1 test result, sample 660VAC power-frequency overvoltage performance prepared by the present embodiment is better than
Specification is the piezoresistor of 20D821, and during pulse current test, the pulse residual voltage of inventive samples is far below
Specification is the pulse residual voltage of 20D821 piezoresistor.
Table 1, sample and comparative sample power-frequency overvoltage and the pulse testing result of the present embodiment
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by described reality
Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (3)
1. Thunder-prevention overvoltage protection device, it is characterised in that include piezoresistive wafer, positive temperature coefficient temperature-sensitive electricity
Resistance sheet and gas-discharge tube, described piezoresistive wafer and semistor sheet are packaged as a whole, shape
Become packaging body；The Curie temperature of described semistor sheet is 95～125 DEG C, and room temperature resistance is
10～300 ohm；The pressure sensitive voltage 350～550V or 170～270V of piezoresistive wafer；The arteries and veins of gas-discharge tube
Rushing breakdown voltage is 450～650V；
One electrode welding lead-in wire of described semistor sheet, as the first exit；Positive temperature
The another side electrode of degree coefficient ceramics thermosensitive resistor film is welded on by scolding tin with an electrode of piezoresistive wafer
Together, common port is formed, simultaneously as three terminal；The another side electrode welding lead-in wire of piezoresistive wafer,
It it is the second exit；After the encapsulation of semistor sheet, piezoresistive wafer, formation has three and draws
Go out the packaging body of end；Gas-discharge tube is connected between the first exit and three terminal；
In use, the first exit and the second exit are connected in parallel on to be protected described Thunder-prevention overvoltage protection device
On power circuit, it is used for suppressing switching overvoltage and fault power-frequency overvoltage: when thunderbolt pulse surge occurs
Time, described Thunder-prevention overvoltage protection device action, play the protective effect of piezoresistive wafer；
When piezoresistive wafer long-term load makes performance degradation, under normal voltage load, leakage current increase causes
Its temperature raises, and heat is delivered on semistor sheet, when temperature reaches positive temperature coefficient heat
The Curie temperature of quick resistor disc, semistor sheet resistance drastically raises, and limits piezoresistive wafer
Electric current, prevent piezoresistive wafer detonation.
Thunder-prevention overvoltage protection device the most according to claim 1, it is characterised in that described in be encapsulated as adopting
Encapsulate with anti-flammability organic resin material.
3. according to the Thunder-prevention overvoltage protection device described in any one of claim 1～2, it is characterised in that described
Piezoresistive wafer is zinc oxide varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310268448.7A CN103311916B (en) | 2013-06-28 | 2013-06-28 | Thunder-prevention overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310268448.7A CN103311916B (en) | 2013-06-28 | 2013-06-28 | Thunder-prevention overvoltage protection device |
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| Publication Number | Publication Date |
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| CN103311916A CN103311916A (en) | 2013-09-18 |
| CN103311916B true CN103311916B (en) | 2016-09-28 |
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| CN201310268448.7A Expired - Fee Related CN103311916B (en) | 2013-06-28 | 2013-06-28 | Thunder-prevention overvoltage protection device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105048212A (en) * | 2015-07-29 | 2015-11-11 | 林峰伟 | High-efficiency converter socket resistant to surge and lightning stroke |
| CN110596545A (en) * | 2019-09-04 | 2019-12-20 | 国网江苏省电力有限公司电力科学研究院 | Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage |
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| CN201383679Y (en) * | 2009-04-03 | 2010-01-13 | 成都顺康电子有限责任公司 | Low-capacitance combination solid discharge tube chip |
| CN201383397Y (en) * | 2009-04-03 | 2010-01-13 | 成都顺康电子有限责任公司 | Low-capacitance combination piezoresistor |
| CN103311914A (en) * | 2013-05-31 | 2013-09-18 | 深圳市劲阳电子有限公司 | Overvoltage production circuit of composite type piezoresistor |
| CN203434621U (en) * | 2013-06-28 | 2014-02-12 | 华南理工大学 | Lightning protection overvoltage protection device |
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| DE19623541A1 (en) * | 1996-06-13 | 1997-12-18 | Abb Research Ltd | Process for protecting a network or a system against overvoltages and voltage limiting circuit |
| CN201036096Y (en) * | 2007-03-19 | 2008-03-12 | 深圳市劲阳电子有限公司 | Composite type positive temperature coefficient thermal resistance |
| SI23303A (en) * | 2010-02-19 | 2011-08-31 | ISKRA ZAĹ ÄŚITE d.o.o. | Overvoltage arrester with rotating disk and electronic component for improvement of operation reliability |
| CN202662415U (en) * | 2012-06-19 | 2013-01-09 | 华南理工大学 | Composite type voltage and current protection assembly |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201383679Y (en) * | 2009-04-03 | 2010-01-13 | 成都顺康电子有限责任公司 | Low-capacitance combination solid discharge tube chip |
| CN201383397Y (en) * | 2009-04-03 | 2010-01-13 | 成都顺康电子有限责任公司 | Low-capacitance combination piezoresistor |
| CN103311914A (en) * | 2013-05-31 | 2013-09-18 | 深圳市劲阳电子有限公司 | Overvoltage production circuit of composite type piezoresistor |
| CN203434621U (en) * | 2013-06-28 | 2014-02-12 | 华南理工大学 | Lightning protection overvoltage protection device |
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| TR01 | Transfer of patent right |
Effective date of registration: 20171204 Address after: 510640 Tianhe District, Guangdong, No. five road, No. 381, Co-patentee after: Shenzhen Jinyang Electronic Co., Ltd. Patentee after: South China University of Technology Co-patentee after: Guangzhou Guan Electronics Co., Ltd. Address before: 510641 Tianhe District, Guangdong, No. five road, No. 381, Co-patentee before: Shenzhen Jinyang Electronic Co., Ltd. Patentee before: South China University of Technology Co-patentee before: Shenzhen Gu'an Electronics Co., Ltd. |
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| 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: 20160928 Termination date: 20210628 |