CN102832000A - Multi-state indicating safety pressure sensitive resistor - Google Patents
Multi-state indicating safety pressure sensitive resistor Download PDFInfo
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- CN102832000A CN102832000A CN2012103269608A CN201210326960A CN102832000A CN 102832000 A CN102832000 A CN 102832000A CN 2012103269608 A CN2012103269608 A CN 2012103269608A CN 201210326960 A CN201210326960 A CN 201210326960A CN 102832000 A CN102832000 A CN 102832000A
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- pressure sensitive
- piezo
- resistance
- piezoresistor
- sensitive resistor
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Abstract
The invention discloses a multi-state indicating safety pressure sensitive resistor, which belongs to the pressure sensitive resistors. The invention aims to provide a pressure sensitive resistor having high heat turn-off response speed and capable of giving multiple alarm states. The pressure sensitive resistor comprises a piezoresistor, a first external electrode electrically connected with one electrode of the piezoresistor, and a second external electrode electrically connected with the other electrode of the piezoresistor by a heat separating mechanism; the piezoresistor (10) is encapsulated in an insulating box (4), the central region of the piezoresistor exposes from a window (11) arranged on the surface of the insulating box; the heat separating mechanism comprises a spring piece (8), wherein one end of the spring piece (8) is in welded connection with the central region of the piezoresistor (10), and the other end of the spring piece (8) is fixedly connected with a second electrode (6). The multi-state indicating safety pressure sensitive resistor not only increases the heat separating response speed and has high reliability, but also can implement the remote alarm and the on-site alarm, can effectively eliminate the hidden fire hazard caused by the short circuit and is a pressure sensitive resistor which can be widely used in multiple circuits.
Description
Technical field
The present invention relates to a kind of varistor, relate in particular to a kind of safe type piezoresistor device.
Background technology:Piezo-resistance is a kind of votage limit type protection device, and its current-voltage characteristic curve has significant nonlinear characteristic.Be in high-impedance state under the piezo-resistance normal working voltage, be equivalent to a capacitor; After surpassing certain voltage, will become low resistance state and with the electric current shunting, thereby protection electric equipment and electronic component do not damage because of overvoltage.In use, piezo-resistance usually receives the synergy of pulse voltage, temporary overvoltage, three types of electric stresss of power-frequency voltage, and easy deterioration of its performance and even short circuit were lost efficacy; And powerful short circuit current will produce very big thermal effect and mechanical effect, and circuit is damaged, even initiation fire.Therefore, how to prevent reliably that piezo-resistance from being present problem demanding prompt solution because of the inefficacy initiation fire.
At present, have the varistor of heat protection function, normally on piezoresistive element, attach a thermo-fuse; When piezo-resistance received all kinds overvoltage and causes temperature anomaly to raise, thermo-fuse fusing and forming was opened circuit, thereby reaches heat protection purpose.There are two serious technological deficiencies in the varistor of this structure: 1) thermo-fuse must insulate with the piezo-resistance body surface except that electric connection point; And the thermal conductivity of insulating material is relatively poor; Can only rely on the very little electric connection point heat conduction of thermo-fuse area; Heat accumulation efficient is low, the thermo-fuse fusing time is longer, when running into higher power-frequency overvoltage, can not cut off circuit in fast and reliable ground; 2) the power frequency breakdown point of traditional varistor is a random distribution; Distance from the highest power frequency breakdown point of temperature rise to thermo-fuse may be distant, heat transferred is slow, thermo-fuse fusing response speed is slower, can't in time sense excessive temperature and in time open circuit.These two serious defectives all make its heat protection effect have a greatly reduced quality, and can not effectively prevent varistor catching fire under higher power-frequency overvoltage.In addition, the varistor of traditional structure does not have the state deixis, behind the piezo-resistance performance degradation, can not in time find reliably and change, and has big potential safety hazard.
Summary of the invention:To the above-mentioned defective that exists in the prior art, it is fast that the present invention aims to provide a kind of heat disengaging response speed, can send the multimode indication safe type piezoresistor device of multiple alarm condition.
To achieve these goals, the present invention adopts following technical scheme: the second external electrode that it comprises piezo-resistance, the first external electrode that is connected with an electrode electricity of this piezo-resistance, is connected with another electrode electricity of this piezo-resistance through hot releasing mechanism; Piezo-resistance is encapsulated in the insulation booth, and the middle section of this piezo-resistance exposes from the window that is located at this insulation booth surface; Said hot releasing mechanism comprises an end and the spring leaf that the middle section of piezo-resistance is welded to connect, the other end is fixedly connected with the second external electrode.
Said hot releasing mechanism also comprises the bearing pin that is fixed on the insulation booth, is located at the cut-out plate on this bearing pin and between insulation booth and spring leaf, the spring that will cut off the plate tension; The signal of telecommunication pin that the surface of insulation booth is fixed with sensitive switch and is electrically connected with the second external electrode; Insulation booth is fixed in the shell, and the top margin of this shell is provided with corresponding to the position that cuts off plate and shows window.
Compare with prior art, the present invention for the method that " 20111022032.5 " are provided prepares piezoresistive element, moves to the central area of piezoresistive element according to application number in the power frequency breakdown point with piezoresistive element; And adopted technique scheme, hot dispersal point is overlapped with the power frequency breakdown point position of piezoresistive element, therefore shortened the heat conduction distance, improved the response speed that piezo-resistance heat breaks away from.In addition, owing between spring leaf and piezo-resistance, adopted the cut-out plate of holding by spring; When the low temperature melts soldering tin, cut off plate cut-off loop rapidly under the effect of spring, further improved the reliability of hot disengaging.The 3rd, because spring leaf has bigger surface area,, shortened low temperature scolding tin fusing time when product overload operation or product quality descend and can quick heat-collector when causing temperaturing lifting abnormality, eliminated the hidden danger of short circuit breaking out of fire effectively.The 4th owing to be provided with sensitive switch, signal of telecommunication pin and show window, therefore not only realized remote alarms, but also can onsite alarming, thereby can remind the user in time to repair or replace, avoid next power-frequency overvoltage and cause device damage.
Description of drawings:
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the perspective view after shell is removed in invention.
Among the figure: shell 1 hot dispersal point 2 springs 3 insulation booths 4 first electrodes 5 the second external electrodes 6 signal of telecommunication pins 7 spring leafs 8 cut off plate 9 piezo-resistances 10 windows 11 bearing pins 12 and show window 13 sensitive switches 14
Embodiment:Below in conjunction with accompanying drawing and concrete embodiment the present invention is described further:
Shown in Fig. 1～2: piezo-resistance 10 is encapsulated in the insulation booth 4, and the middle section of this piezo-resistance exposes from the window 11 that is located at this insulation booth surface; Be provided with hot releasing mechanism on the surface of insulation booth 4; This hot releasing mechanism is welded on middle section, the other end of piezo-resistance 10 by an end through low melting point scolding tin and is fixed on the spring leaf 8 that the second external electrode 6 on the insulation booth 4 is electrically connected and constitutes, and the pad of the middle section of this spring leaf and piezo-resistance 10 is hot dispersal point 2.Electrode of piezo-resistance 10 is electrically connected with first electrode 5 on being fixed on insulation booth 4, another electrode of this piezo-resistance is electrically connected with spring leaf 8 through hot dispersal point 2.
When the low temperature melts soldering tin; Can upspring rapidly, disengage and cut off circuit in order to ensure spring leaf 8 with piezo-resistance 10; Be fixed with bearing pin 12 on the surface of insulation booth 4; Cut-out plate 9 between insulation booth 4 and spring leaf 8 is enclosed within on this bearing pin, and the lower end of this cut-out plate is by spring 3 tensions that are fixed on the insulation booth 4.
For easy to use, insulation booth 4 is fixed in the shell 1.For the ease of onsite alarming, the top margin of shell 1 is provided with the observable window 13 that shows corresponding to the position that cuts off plate 9; If the low temperature melts soldering tin, cut off plate 9 and rotating counterclockwise and during around bearing pin 12 under the effect of spring 3 spring leaf 8 jack-up, it is that indication circuit is cut off that the upper end that cuts off plate 9 turns to the position that shows window 13.
For easy to use, onsite alarming can also adopt following structure: on insulation booth 4, be fixed with the signal of telecommunication pin 7 that is electrically connected with the second external electrode 6; When spring leaf 8 is upspring and when disengaging with piezo-resistance 10, signal of telecommunication pin 7 no signals output (voltage reduces to zero), the onsite alarming circuit that is electrically connected with signal of telecommunication pin 7 can send alarm.
In order to realize remote alarms, the surface of insulation booth 4 is fixed with sensitive switch 14; In case circuit is cut off, this sensitive switch just can move and send alarm signal to remote equipment.
Claims (4)
1. multimode indication safe type piezoresistor device, the second external electrode that comprises piezo-resistance, the first external electrode that is connected with an electrode electricity of this piezo-resistance, is connected with another electrode electricity of this piezo-resistance through hot releasing mechanism; It is characterized in that: piezo-resistance (10) is encapsulated in the insulation booth (4), and the middle section of this piezo-resistance exposes from the window (11) that is located at this insulation booth surface; Said hot releasing mechanism comprises the spring leaf (8) that an end is welded to connect with the middle section of piezo-resistance (10), the other end is fixedly connected with the second external electrode (6).
2. multimode according to claim 1 indication safe type piezoresistor device is characterized in that: said hot releasing mechanism also comprises the bearing pin (12) that is fixed on the insulation booth (4), be located on this bearing pin and be positioned at insulation booth (4) with spring leaf (8) between cut-out plate (9), will cut off the spring (3) that plate is strained.
3. multimode indication safe type piezoresistor device according to claim 2 is characterized in that: the signal of telecommunication pin (7) that the surface of insulation booth (4) is fixed with sensitive switch (14) and is electrically connected with the second external electrode (6).
4. according to claim 2 or 3 described multimode indication safe type piezoresistor devices, it is characterized in that: insulation booth (4) is fixed in the shell (1), and the top margin of this shell is provided with corresponding to the position that cuts off plate (8) and shows window (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103269608A CN102832000A (en) | 2012-09-06 | 2012-09-06 | Multi-state indicating safety pressure sensitive resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103269608A CN102832000A (en) | 2012-09-06 | 2012-09-06 | Multi-state indicating safety pressure sensitive resistor |
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| Publication Number | Publication Date |
|---|---|
| CN102832000A true CN102832000A (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103269608A Pending CN102832000A (en) | 2012-09-06 | 2012-09-06 | Multi-state indicating safety pressure sensitive resistor |
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| CN (1) | CN102832000A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946007A (en) * | 2017-10-12 | 2018-04-20 | 爱普科斯电子元器件(珠海保税区)有限公司 | A kind of heat protection pressure sensitive resistor of damascene structures |
| CN107946011A (en) * | 2017-10-12 | 2018-04-20 | 爱普科斯电子元器件(珠海保税区)有限公司 | A kind of embedded varistor with heat protection function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6430019B1 (en) * | 1998-06-08 | 2002-08-06 | Ferraz S.A. | Circuit protection device |
| CN1684332A (en) * | 2004-04-16 | 2005-10-19 | 凤凰接触股份有限及两合公司 | Over voltage protector |
| CN1914696A (en) * | 2004-04-19 | 2007-02-14 | 苏勒过压保护公司 | Surge voltage protection device with arc-breaking means |
| CN101834434A (en) * | 2009-07-27 | 2010-09-15 | 佛山市浦斯电子有限公司 | Surge protector with thermal protection device |
| CN202839181U (en) * | 2012-09-06 | 2013-03-27 | 贵阳高新益舸电子有限公司 | Multi-state indication safe type piezoresistor |
-
2012
- 2012-09-06 CN CN2012103269608A patent/CN102832000A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6430019B1 (en) * | 1998-06-08 | 2002-08-06 | Ferraz S.A. | Circuit protection device |
| CN1684332A (en) * | 2004-04-16 | 2005-10-19 | 凤凰接触股份有限及两合公司 | Over voltage protector |
| CN1914696A (en) * | 2004-04-19 | 2007-02-14 | 苏勒过压保护公司 | Surge voltage protection device with arc-breaking means |
| CN101834434A (en) * | 2009-07-27 | 2010-09-15 | 佛山市浦斯电子有限公司 | Surge protector with thermal protection device |
| CN202839181U (en) * | 2012-09-06 | 2013-03-27 | 贵阳高新益舸电子有限公司 | Multi-state indication safe type piezoresistor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946007A (en) * | 2017-10-12 | 2018-04-20 | 爱普科斯电子元器件(珠海保税区)有限公司 | A kind of heat protection pressure sensitive resistor of damascene structures |
| CN107946011A (en) * | 2017-10-12 | 2018-04-20 | 爱普科斯电子元器件(珠海保税区)有限公司 | A kind of embedded varistor with heat protection function |
| CN107946011B (en) * | 2017-10-12 | 2020-03-31 | 爱普科斯电子元器件(珠海保税区)有限公司 | Embedded voltage dependent resistor with thermal protection function |
| CN107946007B (en) * | 2017-10-12 | 2020-05-12 | 爱普科斯电子元器件(珠海保税区)有限公司 | Thermal protection piezoresistor with embedded structure |
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Application publication date: 20121219 |