CN202309063U - Overvoltage protecting device - Google Patents
Overvoltage protecting device Download PDFInfo
- Publication number
- CN202309063U CN202309063U CN2011203997926U CN201120399792U CN202309063U CN 202309063 U CN202309063 U CN 202309063U CN 2011203997926 U CN2011203997926 U CN 2011203997926U CN 201120399792 U CN201120399792 U CN 201120399792U CN 202309063 U CN202309063 U CN 202309063U
- Authority
- CN
- China
- Prior art keywords
- links
- piezoresistor
- resistance
- piezo
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an overvoltage protecting device, comprising a piezoresistor. A first end of the piezoresistor is connected with a live line, and a second end of the piezoresistor is connected with a null line. The overvoltage protecting device further comprises a gas discharging tube connected in series with the piezoresistor, wherein an anode of the gas discharging tube is connected with the second end of the piezoresistor, and a cathode of the gas discharging tube is connected with an earth line. When a voltage is increased or lightning stroke occurs, insulating impedance of the piezoresistor is decreased and a leakage current is increased, so that the current of the gas discharging tube which is connected in series with the piezoresistor is increased sharply. When an insulating intensity of gas is exceeded, both electrodes of the gas discharging tube are broken down; the gas discharging tube is converted from a former insulating state to a conducting state; and the current directly flows to the earth line. Therefore, heating and burning which are caused by that a large leakage current flows through the piezoresistor 1, are avoided; the security and the reliability of a circuit are ensured, and the security of rear electric equipment can be effectively protected. When a dangerous voltage recovers to be normal, the parameters of the piezoresistor and the gas discharging tube recover to be normal and the electric equipment normally works.
Description
Technical field
The utility model relates to the protection field of electrical appliance, particularly a kind of overvoltage protection.
Background technology
In supply network, voltage is not the 220V of standard, and sometimes even can reach more than the 250V, simultaneously, electrical appliance equipment might be struck by lightning, and in this case, the electrical appliance equipment of 220V can't operate as normal even burnt out.
Existing; In the alternating current 220V protectiving scheme, adopt the mode of single piezo-resistance, be about to piezo-resistance and be connected between live wire and the zero line, before the electrical appliance; When the voltage in the circuit is lower than the threshold values that is arranged on piezo-resistance; The electric current that flows through it is minimum, is equivalent to one and closes dead valve, electrical appliance operate as normal; When the voltage in the circuit surpassed threshold values, the electric current that flows through it increased sharply, and is equivalent to valve open, utilized shunting to reduce the electric current that flows into electrical appliance, had protected the safety of electrical appliance.But, the bottleneck that the existence of piezo-resistance own can't break through so far, piezo-resistance had good insulation impedance before not being hit, and promptly leakage current is very low; But when power network fluctuation or after suffering thunderbolt to wait impact; Piezo-resistance meeting deterioration causes insulation impedance to descend, and leakage current strengthens; Along with the impact aggravation in the external world, this leakage current strengthens the electric current that has wholesale and flows through piezo-resistance and cause heating circuit board to be burnt out or even short-circuit fire.
In sum, how a kind of overvoltage protection is provided,, becomes the important technological problems that those skilled in the art need to be resolved hurrily to realize effectively protecting the safety of power consumption equipment.
The utility model content
In view of this, the utility model provides a kind of overvoltage protection, to realize effectively protecting the safety of power consumption equipment.
For realizing above-mentioned purpose, the utility model provides following technical scheme:
A kind of overvoltage protection; Comprise piezo-resistance; First end of said piezo-resistance links to each other with live wire, and second end of said piezo-resistance links to each other with zero line, also comprises the gas discharge tube of connecting with said piezo-resistance; The positive pole of said gas discharge tube links to each other with second end of said piezo-resistance, and the negative pole of said gas discharge tube links to each other with ground wire.
Preferably, in the above-mentioned overvoltage protection, comprise that also said is connected on the resettable fuse on live wire or the zero line.
Preferably, in the above-mentioned overvoltage protection, also comprise third level protector; Said third level protector specifically comprises; Voltage-stabiliser tube and thyristor, the anode of said voltage-stabiliser tube links to each other with live wire, and the negative electrode of said voltage-stabiliser tube extremely links to each other with the control of said thyristor; The anode of said thyristor links to each other with live wire, and the negative electrode of said thyristor links to each other with zero line.
Preferably, in the above-mentioned overvoltage protection, first end of said resettable fuse links to each other with first end of said piezo-resistance, and second end of said resettable fuse links to each other with the anode of said voltage-stabiliser tube.
Preferably, in the above-mentioned overvoltage protection, also comprise the fusing fuse of the input of the live wire that is arranged on overvoltage protection.
Preferably, in the above-mentioned overvoltage protection, also comprise the isolating transformer of the output that is arranged on overvoltage protection, the positive pole of said isolating transformer links to each other with the output of live wire, and the negative pole of said isolating transformer links to each other with the output of zero line.
Can find out that from above-mentioned technical scheme the overvoltage protection that the utility model provides comprises piezo-resistance; First end of piezo-resistance is linked to each other with live wire, and second end links to each other with zero line, but because the drawback that piezo-resistance self exists; When power network fluctuation or after being struck by lightning; Piezo-resistance meeting deterioration causes insulation impedance to descend, and leakage current strengthens.Therefore the overvoltage protection that provides of the utility model has been set up the gas discharge tube of connecting with piezo-resistance, and the positive pole of gas discharge tube links to each other with second end of piezo-resistance, and the negative pole of gas discharge tube links to each other with ground wire.The operation principle of gas discharge tube is a gas discharge, and when applied voltage increased to the dielectric strength above gas, the gap of two interpolars was converted into conduction state with discharge breakdown by original state of insulation.When voltage increased or is struck by lightning, the insulation impedance of piezo-resistance descended, and leakage current strengthens; This moment, the electric current with the gas discharge tube that piezo-resistance is in series increased sharply; When surpassing the dielectric strength of gas, the two poles of the earth of gas discharge tube puncture, and are converted into conduction state by original state of insulation; Electric current directly flows to ground wire; Solved because the wholesale leakage current flows through the heating that causes and the burning of piezo-resistance 1, guaranteed the fail safe and the reliability of circuit, effectively protected the safety of the electrical appliance of back.When dangerous voltage recovers just often, the parameter of piezo-resistance and gas discharge tube revert to normal condition respectively, the electrical appliance operate as normal.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the overvoltage protection that Fig. 1 provides for the utility model embodiment.
Wherein:
Piezo-resistance 1, gas discharge tube 2, first automatic recovery fuse 31, voltage-stabiliser tube 4, thyristor 5, fusing fuse 6, isolating transformer 7.
Embodiment
For quote and know for the purpose of, the technical term that hereinafter uses is summed up as follows:
The fusing fuse: when electric current over insurance silk rated value, fusing voluntarily, the circuit of protection back.
Piezo-resistance: resistance value is to the resistor of voltage-sensitive.When the voltage above being added in it was lower than its threshold values, the electric current that flows through it was minimum, was equivalent to one and closed dead valve, and when voltage surpassed UN, the electric current that flows through it increased sharply, and is equivalent to valve open.
Resettable fuse: a kind of overcurrent Electronic Protection element; Resistance is lower during operate as normal, and when circuit was short-circuited or transship, the heat that the big electric current of the self-healing fuse of flowing through produces melted polymer resin; Volume increases rapidly; Form high-impedance state, operating current reduces rapidly, thereby circuit is limited and protects.
Gas discharge tube: the operation principle of discharge tube is a gas discharge, and when applied voltage increased to the dielectric strength above gas, the gap of two interpolars was converted into conduction state with discharge breakdown by original state of insulation.
Thyristor:, also, can make the bidirectional thyristor conducting no matter what polarity this pulse is as long as in its control extremely, add a trigger impulse.
Leakage current:, be referred to as leakage current when electric current overflows through behind the insulation impedance.
Isolating transformer: isolate dangerous voltage, make the electric insulation fully of primary side and secondary side, the protection personal safety.
Electrical appliance equipment: the device of consumed power is electrical appliance in the circuit.
The utility model discloses a kind of overvoltage protection, to realize effectively protecting the safety of power consumption equipment.
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
See also Fig. 1, wherein the structural representation of the overvoltage protection that provides for the utility model embodiment of Fig. 1.
The utility model provides a kind of overvoltage protection, when power network fluctuation or when being struck by lightning, is used to protect the safety of power consumption equipment.Comprise that first end links to each other with live wire; The piezo-resistance 1 that second end links to each other with zero line; Piezo-resistance 1 is the resistor of resistance value to voltage-sensitive, stablizes the voltage that is added on the piezo-resistance 1 when voltage and is lower than the threshold values of self, and the electric current that flows through piezo-resistance 1 is minimum; This is that it is equivalent to a valve that the pass is dead, power consumption equipment operate as normal at this moment; When being added in the voltage increase suddenly on the power consumption equipment or being struck by lightning; Be added in the threshold values that voltage on the piezo-resistance 1 surpasses self, the electric current that flows through it increases sharply, and is equivalent to valve open; Reduce to flow into the magnitude of current of electrical appliance equipment, protected the safety of power consumption equipment.But the bottleneck of piezo-resistance 1 itself is when power network fluctuation or after waited by thunderbolt to impact, piezo-resistance 1 is understood deterioration; Cause insulation impedance to descend, leakage current increases, along with the impact aggravation in the external world; This leakage current adds conference and causes circuit board to burn out even short-circuit fire; In order effectively to solve the problem of piezo-resistance 1 leakage current, the overvoltage protection that the utility model provides, series connection gas discharge tube 2 on piezo-resistance 1; The positive pole of gas discharge tube 2 links to each other with the negative pole of piezo-resistance 1, and the negative pole of gas discharge tube 2 links to each other with ground wire.Gas discharge tube 2 is to lean on gas discharge, and when applied voltage was stablized, gas discharge tube 2 was a state of insulation, and circuit is obstructed, electrical appliance equipment operate as normal; When applied voltage increases to the dielectric strength above gas; The gap of two interpolars is converted into conduction state with discharge breakdown by original state of insulation, and gas discharge tube 2 links to each other with ground wire; The electric current that piezo-resistance 1 is leaked leads to the earth; Solved because the wholesale leakage current flows through the heating that causes and the burning of piezo-resistance 1, guaranteed the fail safe and the reliability of circuit, effectively protected the safety of back power consumption equipment.When voltage recovers just often, the parameter of piezo-resistance and gas discharge tube revert to normal condition respectively, the electrical appliance operate as normal.
In order better to guarantee the safety of circuit, effectively protect the safety of power consumption equipment, the overvoltage protection that the utility model provides; Also be provided with the resettable fuse 31 of on live wire or zero line, connecting, resettable fuse 31 is a kind of overcurrent electronic protections, and resistance is lower during operate as normal; When circuit is short-circuited or transship; The heat that the big electric current of resettable fuse 31 of flowing through produces melts polymer resin, and volume increases rapidly, forms high-impedance state; Operating current reduces rapidly, thereby circuit is limited and protects.Resettable fuse 31 is connected on the live wire, when occurring the 380V overvoltage in the circuit, resettable fuse 31 actions; Volume increases rapidly, forms high-impedance state, consumes a large amount of electric currents through heating; The electric current of the power consumption equipment of flowing through is reduced, the circuit of power consumption equipment is limited and protects.After down circuitry, resettable fuse 31 recovers, and circuit can operate as normal.
In the course of work, resettable fuse 31 may produce fault, effective protective circuit, and cause circuit to burn out, Given this, among a kind of embodiment that the utility model provides, a plurality of resettable fuses 31 are set.
In order further to optimize technique scheme; The effective safety of power consumption equipment during the protection overvoltage, the overvoltage protection that the utility model provides has further comprised third level protector, concrete voltage-stabiliser tube 4 and the thyristor 5 of comprising; The anode of voltage-stabiliser tube 4 is linked to each other with live wire; The negative electrode of voltage-stabiliser tube 4 extremely links to each other with the control of thyristor 5, and the anode of thyristor 5 links to each other with live wire, and the negative electrode of thyristor 5 links to each other with zero line.During the power consumption equipment operate as normal, thyristor 5 closures are not worked with the voltage-stabiliser tube 4 that the control of thyristor 5 extremely links to each other; When voltage was higher than 250V, thyristor 5 was opened, because the negative electrode of voltage-stabiliser tube 4 extremely links to each other with the control of thyristor 5, so constitute the loop, avoided the circuit of high voltage entering back, after voltage recovers normally, and thyristor 5 closures, power consumption equipment operate as normal.
In order to realize the mutual protection between irritated resistance 1, resettable fuse 31 and the third level protector; The novel overvoltage protection that provides of this use links to each other first end of resettable fuse 31 with first end of piezo-resistance 1, second end of resettable fuse 31 is linked to each other with the anode of voltage-stabiliser tube, when overtension or when being struck by lightning; Be added in the threshold values that magnitude of voltage on the circuit surpasses piezo-resistance 1; Piezo-resistance 1 work, leakage current surpasses the threshold values of gas discharge tube 2, gas discharge; And link to each other with ground wire, can protect the safety of back circuit; When magnitude of voltage surpassed 380V, the volume of resettable fuse 31 increased rapidly, formed high-impedance state, reduced to flow into the back magnitude of current, and protection adds the safety at the circuit of back; When magnitude of voltage was higher than 250V, thyristor 5 was opened, because the negative electrode of voltage-stabiliser tube 4 extremely links to each other with the control of thyristor 5, so constitute the loop, avoided high voltage to get into the circuit of back, and protection is the safety of circuit at the back.When dangerous voltage recovers just often each parametric regression normal condition of protector, power consumption equipment operate as normal.The utility model is through protection layer by layer, not only can lightning protection but also the effect of overvoltage protection is arranged, and also outage back circuit can recover voluntarily.
Avoid transshipping the infringement with short circuit current in order to protect electric equipment; Input at the live wire of overvoltage protection is provided with fusing fuse 6; When the apparatus overload in circuit or the circuit perhaps breaks down; Fusing fuse 6 generates heat and melts, thereby cuts off circuit, reaches the purpose of protective circuit or equipment.
In order to isolate dangerous voltage, protect personal safety, the overvoltage protection that the utility model provides further comprises the isolating transformer 7 of the output that is arranged on overvoltage protection.The positive pole of isolation voltage device 7 is linked to each other with the output of live wire, and negative pole links to each other with the output of zero line.During work, isolating transformer 7 is isolated input circuit and output loop fully, makes electricity consumption equipment end and feeder ear electrical isolation, not only protects the safety of power consumption equipment, can also protect personal safety.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (6)
1. overvoltage protection; Comprise piezo-resistance (1), first end of said piezo-resistance (1) links to each other with live wire, and second end of said piezo-resistance (1) links to each other with zero line; It is characterized in that; Also comprise the gas discharge tube (2) of connecting with said piezo-resistance (1), the positive pole of said gas discharge tube (2) links to each other with second end of said piezo-resistance (1), and the negative pole of said gas discharge tube (2) links to each other with ground wire.
2. overvoltage protection according to claim 1 is characterized in that, comprises that also said is connected on the resettable fuse (31) on live wire or the zero line.
3. overvoltage protection according to claim 2 is characterized in that, also comprises third level protector; Said third level protector specifically comprises; Voltage-stabiliser tube (4) and thyristor (5), the anode of said voltage-stabiliser tube (4) links to each other with live wire, and the negative electrode of said voltage-stabiliser tube (4) extremely links to each other with the control of said thyristor (5); The anode of said thyristor (5) links to each other with live wire, and the negative electrode of said thyristor (5) links to each other with zero line.
4. overvoltage protection according to claim 3; It is characterized in that; First end of said resettable fuse (31) links to each other with first end of said piezo-resistance (1), and second end of said resettable fuse (31) links to each other with the anode of said voltage-stabiliser tube (4).
5. according to each described overvoltage protection of claim 1-4, it is characterized in that, also comprise the fusing fuse (6) of the input of the live wire that is arranged on overvoltage protection.
6. according to the described overvoltage protection of claim 1-4; It is characterized in that; The isolating transformer (7) that also comprises the output that is arranged on overvoltage protection; The positive pole of said isolating transformer (7) links to each other with the output of live wire, and the negative pole of said isolating transformer (7) links to each other with the output of zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203997926U CN202309063U (en) | 2011-10-19 | 2011-10-19 | Overvoltage protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203997926U CN202309063U (en) | 2011-10-19 | 2011-10-19 | Overvoltage protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202309063U true CN202309063U (en) | 2012-07-04 |
Family
ID=46377877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203997926U Expired - Lifetime CN202309063U (en) | 2011-10-19 | 2011-10-19 | Overvoltage protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202309063U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490261A (en) * | 2016-02-05 | 2016-04-13 | 江世军 | Safety electricity utilization intelligent device |
-
2011
- 2011-10-19 CN CN2011203997926U patent/CN202309063U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490261A (en) * | 2016-02-05 | 2016-04-13 | 江世军 | Safety electricity utilization intelligent device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105098748B (en) | A kind of Surge Protector and the method for lifting its temporary overvoltage tolerance | |
| CN103715652B (en) | Surge protector back-up protection intelligence release unit | |
| CN203747397U (en) | Over-current protective device for protecting over-voltage protection element | |
| CN204089187U (en) | A kind of Surge Protector | |
| CN103199505B (en) | Output short-circuit protection circuit for high tension battery | |
| CN103855698A (en) | Novel surge protection device | |
| CN101350514A (en) | Current-limiting arc-extinguishing shunted exciter tripping type earthing short circuit protection device | |
| CN202309063U (en) | Overvoltage protecting device | |
| CN106655139B (en) | Surge Protector | |
| CN211046452U (en) | Fault current protector | |
| CN212365903U (en) | Double-channel circuit breaker and overcurrent protection system | |
| CN208589776U (en) | A kind of overcurrent overvoltage protection device | |
| CN208589780U (en) | A kind of Surge Protector | |
| CN203205857U (en) | Lightning protection module and lightning protection device | |
| CN204992522U (en) | Circuit protector | |
| CN112260248A (en) | Overvoltage protection circuit and electronic equipment | |
| CN205429713U (en) | Over -voltage protector | |
| CN101887790B (en) | Piezoresistor for lightning protection | |
| CN202550215U (en) | Supply socket with the function of protection | |
| CN206389110U (en) | A kind of novel surge protective device | |
| CN202997542U (en) | Lightning protection device adapter box of filtering type telephone | |
| CN2569413Y (en) | Contact type surge protector releasing device | |
| CN204905838U (en) | Simple and easy overvoltage protection trigger device | |
| CN105322523A (en) | Novel surge protection device | |
| CN220234201U (en) | Lightning protection circuit and power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
|
| CX01 | Expiry of patent term |