CN101800423A - Surge protection device for suppression of continuous pulse - Google Patents
Surge protection device for suppression of continuous pulse Download PDFInfo
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- CN101800423A CN101800423A CN 201010148019 CN201010148019A CN101800423A CN 101800423 A CN101800423 A CN 101800423A CN 201010148019 CN201010148019 CN 201010148019 CN 201010148019 A CN201010148019 A CN 201010148019A CN 101800423 A CN101800423 A CN 101800423A
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- limiting element
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Abstract
The invention relates to a surge protection device SPD for suppression of continuous pulses, which is a technical improvement of a SPD formed by serial connection of a gas discharge device, such as a gas discharge tube, an air gap and the like, and a voltage-limiting component, such as a piezoresistor, a surge suppression diode and the like. In the improved technical scheme, a discharge resistor RX is connected with the voltage-limiting component in parallel, thereby ensuring the residual voltage stability of the overall SPD under the continuous pulse current and protecting the electronic and electrical equipment.
Description
Technical field
The present invention relates to a kind of surge protector, especially a kind ofly be used to suppress overvoltage surge, thus the surge protector of protection electronics, electric equipment, and the residual voltage of this surge protector under the continuous impulse electric current is relatively stable.
Background technology
Surge protector (SPD) be a kind of with voltage-current characteristic be nonlinear element as the major function element, be used for suppressing instantaneous overvoltage, the protection device of the surge current of releasing is widely used in various electronics and the electric product.The typical element of pressure limiting characteristic is that varistor and semiconductor surge suppress diode, and the typical element of switching characteristic has gas discharge tube, atmospherical discharges gap, controllable silicon diode etc.Only use the SPD of varistor (MOV) or only use the SPD of gas discharge tube (GDT), or, be three leading kinds of present SPD by the SPD (hereinafter to be referred as " V-G tandem type SPD ") that varistor is connected with gas discharge tube and constituted.Using the SPD that only uses MOV in a large number in low-voltage distribution system, an insoluble contradiction is arranged in the application technology of this SPD, is exactly the contradiction of protective feature and voltage life-span and temporary overvoltage (TOV) tolerance.Owing to be added with system voltage all the time on the MOV among this SPD, this voltage stress will make MOV aging, and when TOV occurring in the system, MOV very easily damages.In order to improve the ability that MOV bears system voltage and the TOV of system, can only select the high MOV of reference voltage for use, but so, when overvoltage occurring because of thunder and lightning and system operation in the system, the corresponding rising of the residual voltage of MOV, protective value variation as a result.And MOV and gas discharge tube (GDT) or air gap are together in series, promptly making " V-G tandem type SPD " is a method that solves above-mentioned contradiction.In V-G tandem type SPD; gas discharge tube (GDT) or air gap have isolated system voltage and low value TOV, do not bear voltage stress, the problem of aging that does not have system voltage to cause at ordinary times on the MOV; thereby can select the low MOV of reference voltage for use, protective value is improved.When surge voltage occurring in the system, surge voltage is distributed by the capacitance of two elements at the beginning.Because the natural capacity of MOV is more much bigger than the natural capacity of GDT, the former generally is more than the latter's the hundred times, thereby surge voltage almost all is added on the GDT at the beginning, forces GDT to puncture corona or the arc discharge state of entering.After surge voltage disappeared, MOV blocked the afterflow that power supply promotes.These advantages of V-G tandem type SPD make its range of application expand day by day.
But, common V-G tandem type SPD has a significant drawbacks: because the leakage current of MOV element under low-voltage is minimum, equivalent resistance can be up to tens of megaohms or higher, the formed discharge time constant of the product of this resistance and MOV natural capacity can reach a second level, therefore, under the continuous impulse electric current, the electric charge that preceding pulsatile once electric current charges into the MOV natural capacity can not be released rapidly, instantly during the pulsatile once Calais, and if this pulse and last pulse are the words of same polarity, remaining voltage on the MOV natural capacity will be superimposed upon on the puncture voltage of gas discharge element so, and the discharge voltage of V-G tandem compound is improved.Therefore, common V-G tandem type SPD, under continuous impulse, because the influence of remaining electric charge on the natural capacity of pressure limiting element own the residual voltage of follow-up same polarity pulse is raise, and the blanking time of adjacent two subpulses is short more, the ratio of rising is big more.This grievous injury the protective value of SPD; because actual lightning discharge is multiple discharge, the average pulse number is 2～3, notes down 42 pulses at most; be roughly 0.6ms～0.8s interpulse period, therefore in fact common V-G tandem type SPD is not suitable for device for suppression of continuous pulse.
Summary of the invention
The technical problem to be solved in the present invention is: propose a kind of under the continuous impulse electric current; owing to the last residual charge that discharges and accumulated, can guarantee the surge protector of the stability of whole Surge Protective Device's Residual Voltage on the own natural capacity of pressure limiting element of releasing rapidly.
The technical solution adopted in the present invention is: a kind of surge protector of device for suppression of continuous pulse, be used to suppress overvoltage surge, and comprise pressure limiting element and gas arresting element that series connection is provided with, drain resistor in parallel on the described pressure limiting element.
Specifically, described pressure limiting element is that varistor or surge suppress diode; Described gas discharge element is gas discharge tube or air gap; Described drain resistor is linear resistor or the lower nonlinear resistor of voltage nonlinearity.
Further, on the drain resistor structure in parallel, can be provided with for the split type in parallel or drain resistor of: drain resistor and pressure limiting element and the encapsulation of pressure limiting element integral type with the pressure limiting element.
Because blanking time of pulse is all shorter, in order to reach better inhibition effect, thus protection electronics, electric equipment, described drain resistor needs to satisfy two basic demands at least: 1) the resistance value R of described drain resistor
XSelf capacity C with the pressure limiting element
ZProduct form the timeconstant of releasing
1, the described timeconstant of releasing
1Less than Δ t interpulse period; 2) impulse withstand voltage of described drain resistor is higher than the residual voltage of pressure limiting element.
The principle of technical solutions according to the invention is: when surge voltage occurring in the system, surge voltage is distributed according to pressure limiting element and gas arresting element self capacity separately at the beginning, because the natural capacity of pressure limiting element is more much bigger than the natural capacity of gas discharge element, the former generally is more than the latter's the hundred times, thereby surge voltage almost all is added on the gas discharge element at the beginning, forces the gas discharge component breakdown to enter corona or arc discharge state.After surge voltage disappeared, the pressure limiting element blocked the afterflow that power supply promotes.Even under the continuous impulse electric current, owing to be parallel with a drain resistor on the pressure limiting element, this has just accelerated discharge rate, and the electric charge that the pulsatile once electric current charges on the pressure limiting element natural capacity before making can be released rapidly in the extremely short time.
The invention has the beneficial effects as follows: drain resistor in parallel on the pressure limiting element; because the resistance of drain resistor and the self capacity of pressure limiting element can form the time of releasing; therefore the residual charge that can release rapidly on the pressure limiting element and to be accumulated when discharging because of the last time; raise with regard to the residual voltage that can not make succeeding impulse like this because of the influence of electric charge remaining on the natural capacity of pressure limiting element own; so just can guarantee the stability of the residual voltage of whole surge protector under the succeeding impulse electric current, thereby can be good at protecting electronic electric equipment.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the circuit theory diagrams of existing surge protector;
Fig. 2 is the existing current wave of surge protector under continuous impulse and the oscillogram of residual voltage ripple;
Fig. 3 is circuit theory diagrams of the present invention;
Fig. 4 is the current wave of the present invention under continuous impulse and the oscillogram of residual voltage ripple.
Embodiment
The present invention is further detailed explanation with preferred embodiment in conjunction with the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
The surge protector of a kind of device for suppression of continuous pulse as described in Figure 3 is used to suppress overvoltage surge, comprises pressure limiting element and gas arresting element that series connection is provided with, drain resistor in parallel on the described pressure limiting element.Described pressure limiting element is that varistor or surge suppress diode; Described gas discharge element is gas discharge tube or air gap; Described drain resistor is linear resistor or the lower nonlinear resistor of voltage nonlinearity.Pressure limiting element shown in Figure 3 is piezo-resistance MOV, and model is CJV-34S271, the nominal value U of piezo-resistance
N=270V, capacitance C
ZActual value be 3280pF; The gas discharge element adopts gas discharge tube GDT, and model is R608XHA, and dc breakdown voltage is 600V, and capacitance is less than 2.5pF.The drain resistor of MOV parallel connection is R
XThe linear resistor of=1M Ω.Because the resistance value R of described drain resistor
XSelf capacity C with piezo-resistance
ZProduct form the timeconstant of releasing
1, therefore, the time constant of releasing is τ
1=R
XC
Z=3280 * 10
-12* 10
6=3.28ms.
Applying test voltage on the described surge protector of present embodiment is 50Hz power frequency halfwave rectifier voltage, and therefore, Δ t blanking time between two subpulses is 20ms.Fig. 4 has represented to flow through the waveform of the residual voltage ripple of the current wave of surge protector and SPD.Represented continuous 4 pulses among Fig. 4: the puncture voltage of the 1st pulse is 672V, exceeds 9.1% than the puncture voltage 616V of the 2nd, 3,4 pulses.The puncture voltage quite stable of the 2nd, 3,4 follow-up pulses, they are why low than the 1st, are because the ion-electron that last discharge produces in the GDT pipe is still undercompounding, also have the cause of certain density conducting particles existence.All there are two steps in the residual voltage wave crest portion of the 1st, 3,4 three pulse among Fig. 4, and previous step represents that GDT is in the corona discharge stage, and a back step represents that GDT is in the arc discharge stage.The corona voltage of GDT is higher than arc-over voltage, and rises along with the increase of electric current, and arc-over voltage does not become with size of current before blow-out basically.The 2nd residual voltage ripple among Fig. 4 and its excess-three are individual different, be since supply voltage to small echo, so electric current reduces, and only enters arc discharge in the very short time of the peak dot of electric current, can only keep corona discharge in most of the time, therefore not have tangible second step.
And illustrated in figures 1 and 2 be not have the circuit theory diagrams of existing surge protector of bleeder resistance in parallel and the oscillogram of current wave under the continuous impulse under the electric current and voltage environment identical and residual voltage ripple on the piezo-resistance with present embodiment; as can be seen from Figure 2 waveform under these conditions: 1. the peak value of four residual voltage ripples is followed successively by 584; 2. 736; 3. 640V, 4. 736V.The residual voltage of the follow-up ripple of the 1st ripple obviously raises as can be seen, and unstable.The residual voltage of the 1st ripple of the residual voltage ratio of follow-up ripple exceeds 26%～9.6% in this example.
Just the specific embodiment of the present invention of describing in the above specification, various not illustrating is construed as limiting flesh and blood of the present invention, the person of an ordinary skill in the technical field after having read specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence of an invention and scope.
Claims (7)
1. the surge protector of a device for suppression of continuous pulse is used to suppress overvoltage surge, it is characterized in that: comprise pressure limiting element and gas arresting element that series connection is provided with, drain resistor in parallel on the described pressure limiting element.
2. the surge protector of device for suppression of continuous pulse as claimed in claim 1 is characterized in that: described pressure limiting element is that varistor or surge suppress diode.
3. the surge protector of device for suppression of continuous pulse as claimed in claim 1, it is characterized in that: described gas discharge element is gas discharge tube or air gap.
4. as the surge protector of claim 1 or 2 or 3 described device for suppression of continuous pulse, it is characterized in that: the impulse withstand voltage of described drain resistor is higher than the residual voltage of pressure limiting element.
5. as the surge protector of claim 1 or 2 or 3 described device for suppression of continuous pulse, it is characterized in that: described drain resistor is linear resistor or voltage nonlinear resistor.
6. as the surge protector of claim 1 or 2 or 3 described device for suppression of continuous pulse, it is characterized in that: described drain resistor and pressure limiting element split type in parallel or drain resistor and pressure limiting element integral type encapsulation setting.
7. as the surge protector of claim 1 or 2 or 3 described device for suppression of continuous pulse, it is characterized in that: the resistance value R of described drain resistor
XSelf capacity C with the pressure limiting element
ZProduct form the timeconstant of releasing
1, the described timeconstant of releasing
1Less than Δ t interpulse period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010148019 CN101800423A (en) | 2010-04-06 | 2010-04-06 | Surge protection device for suppression of continuous pulse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010148019 CN101800423A (en) | 2010-04-06 | 2010-04-06 | Surge protection device for suppression of continuous pulse |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108370154A (en) * | 2015-08-13 | 2018-08-03 | 力特半导体（无锡）有限公司 | Overvoltage protection |
| CN108449074A (en) * | 2018-03-12 | 2018-08-24 | 中国人民解放军国防科技大学 | High-power pulse back edge sharpening circuit based on magnetic switch |
| CN109217275A (en) * | 2018-08-22 | 2019-01-15 | 深圳市瑞隆源电子有限公司 | High voltage bearing anti-thunder surge suppression circuit, device and power supply adaptor |
| CN109546637A (en) * | 2018-11-28 | 2019-03-29 | 厦门赛尔特电子有限公司 | A kind of surge protection device and system |
| CN110783906A (en) * | 2018-07-26 | 2020-02-11 | Ripd知识产权发展有限公司 | Surge protection device, circuit, module and system comprising surge protection device, circuit and module |
| CN113783173A (en) * | 2021-08-24 | 2021-12-10 | 华北电力大学 | High-voltage solid-state semiconductor switching device, method for improving voltage utilization rate and application |
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| CN2473794Y (en) * | 2001-03-30 | 2002-01-23 | 黄永钊 | Lightning arrestor leakage protection switch |
| CN1685581A (en) * | 2002-10-08 | 2005-10-19 | 硅系统设计公司 | Over voltage protection circuit |
| CN2794007Y (en) * | 2005-05-13 | 2006-07-05 | 广州易仕科技有限公司 | Lighting arrester |
| CN101252279A (en) * | 2007-02-19 | 2008-08-27 | 株式会社山光社 | Surge protection device and surge protection apparatus using thereof |
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2010
- 2010-04-06 CN CN 201010148019 patent/CN101800423A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2473794Y (en) * | 2001-03-30 | 2002-01-23 | 黄永钊 | Lightning arrestor leakage protection switch |
| CN1685581A (en) * | 2002-10-08 | 2005-10-19 | 硅系统设计公司 | Over voltage protection circuit |
| CN2794007Y (en) * | 2005-05-13 | 2006-07-05 | 广州易仕科技有限公司 | Lighting arrester |
| CN101252279A (en) * | 2007-02-19 | 2008-08-27 | 株式会社山光社 | Surge protection device and surge protection apparatus using thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108370154A (en) * | 2015-08-13 | 2018-08-03 | 力特半导体（无锡）有限公司 | Overvoltage protection |
| US10714240B2 (en) | 2015-08-13 | 2020-07-14 | Littlefuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| US10714241B2 (en) | 2015-08-13 | 2020-07-14 | Littelfuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| CN108449074A (en) * | 2018-03-12 | 2018-08-24 | 中国人民解放军国防科技大学 | High-power pulse back edge sharpening circuit based on magnetic switch |
| CN110783906A (en) * | 2018-07-26 | 2020-02-11 | Ripd知识产权发展有限公司 | Surge protection device, circuit, module and system comprising surge protection device, circuit and module |
| CN109217275A (en) * | 2018-08-22 | 2019-01-15 | 深圳市瑞隆源电子有限公司 | High voltage bearing anti-thunder surge suppression circuit, device and power supply adaptor |
| CN109546637A (en) * | 2018-11-28 | 2019-03-29 | 厦门赛尔特电子有限公司 | A kind of surge protection device and system |
| WO2020108034A1 (en) * | 2018-11-28 | 2020-06-04 | 厦门赛尔特电子有限公司 | Surge protection device and system |
| CN113783173A (en) * | 2021-08-24 | 2021-12-10 | 华北电力大学 | High-voltage solid-state semiconductor switching device, method for improving voltage utilization rate and application |
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Application publication date: 20100811 |