CN2117656U - Low voltage protector for electric appliances - Google Patents
Low voltage protector for electric appliances Download PDFInfo
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- CN2117656U CN2117656U CN 91225193 CN91225193U CN2117656U CN 2117656 U CN2117656 U CN 2117656U CN 91225193 CN91225193 CN 91225193 CN 91225193 U CN91225193 U CN 91225193U CN 2117656 U CN2117656 U CN 2117656U
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- overvoltage
- changeover plug
- electric appliances
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- utility
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Abstract
The utility model provides a changeover plug for protecting electric appliances, having the function of protecting low voltage electric appliances from overcurrent and overvoltage. The changeover plug for protecting electric appliances with simple structure and reliable performance is a changeover plug type electrical appliance protector which has the performance of preventing abnormal overvoltage and overcurrent such as lightning overvoltage, operation overvoltage, arc light earthing overvoltage, resonance overvoltage, power frequency overvoltage, etc. The utility model mainly comprises main components such as a zinc oxide piezoresistor chip, a quick fuse tube, a thermistor, etc. The changeover plug for protecting electric appliances can be designed into various forms according to the requirement of electric equipment. The utility model solves the problem of generating severe accidents that household appliances such as colour televisions, refrigerator, etc. are burned in resident buildings caused by overvoltage and overcurrent in a plurality of areas in recent years.
Description
The utility model relates to a kind of electric prospection changeover plug with protection low-voltage electrical apparatus overvoltage and overcurrent function.Especially can be widely used in single phase distribution equipment, have the changeover plug of abnormal overvoltages such as protecting lightning overvoltage, switching overvoltage, arc grounding overvoltage, resonance overvoltage, power-frequency overvoltage and overcurrent performance.
At present, for above various abnormal overvoltages, generally adopt sic lightning arrester and Zno lightning protection both at home and abroad.But no matter which kind of element can only protect lightning overvoltage and switching overvoltage effectively, burns in succession in case the power-frequency overvoltage intrusion will bring lightning arrester to burn the various power consumption equipments in back.Various protectors have been invented in recent years.China patent application CN85200061U; overvoltage protection device with discharge tube and relay formation is proposed; but because the time response of discharge tube is poor; reach the several seconds; solving lightning overvoltage and switching surge all has any problem to the damage of power consumption equipment; the contact of relay is easily burnt and is melted oxidation in addition, causes loose contact, has reduced reliability.China's patent application CN87203635U again, adopt two lead-in wires of connect between varistor and contact conductor a choked flow inductance and plug base to link, this connecting mode is to want to make the unit fuse to be melted after the piezo-resistance conducting to break or that the upper level fuse is melted is disconnected.Can often have other material of the excessive or artificial usefulness of fuse capacity to replace the phenomenon of fuse in actual use, this connecting mode might make short circuit and phenomenon on fire takes place.China's patent application CN86201488U adopts piezoresistive element and quick fuse protective tube to link again.Because unclear to varistor and the various surge characteristics of electrical network, the selection of the parameter of varistor is improper, exists very big problem in the application, under normal operating voltage, piezo-resistance is just burnt very soon, will cause frequently changing element and interruption of power supply, influences the operate as normal of electrical equipment.Have, the damage type of varistor is that transient heat punctures again, and produces the burnt flavor and the big sound, brings sense of insecurity to the user.
The purpose of this utility model provides a kind of low-voltage device protector; overvoltage and overcurrent protective device with suitable multiple low voltage equipment (36 ┄ 220V) use; its form is a changeover plug, and it can prevent effectively that multiple low voltage equipment from suffering the damage of abnormal overvoltages such as lightning overvoltage, switching overvoltage, arc grounding overvoltage, resonance overvoltage, power-frequency overvoltage and overcurrent.
The purpose of this utility model is achieved in that on the base plate of the insulation crust of low-voltage electrical apparatus protector changeover plug; install two power supply lead wires respectively; Zinc-oxide piezoresistor chip (1) is connected in parallel in the circuit; the section of melting pipe (2) (3) are serially connected in the circuit both sides respectively fast; link with a thermistor again, when transient high voltage is added on the voltage dependent resistor chip (1), voltage dependent resistor chip presents low resistive state rapidly by high resistant; make electric current short circuit in circuit, melt disconnected pipe fast and melted disconnected at 0.3 second.When heavy current impact, no matter be which end by the power supply input enters in the circuit, must make and melt disconnected pipe fast and melt disconnected.Thereby play the effect of bidirectional protective.In circuit, add one at least and melt disconnected pipe fast, can protect electrical appliance equally.Having one power consumption equipment start instantaneous is 2～3 times impulse current of electrical appliance rated current, and thermistor (NTC) (4) impact electric current has the effect of a buffering.And (5) that resistor, diode, light-emitting diode are formed only play the effect of demonstration in circuit; Light indication when normal operating conditions, power supply is cut off when protection, and light shows i.e. disappearance.As shown in Figure 1, it includes latch (1) (2), shell (3), the clamp made from spring leaf (13) clamps, connects an end that melts disconnected pipe (4) fast, firmly melt the other end of disconnected pipe (4) fast with spring leaf (9) extruding, Zinc-oxide piezoresistor chip (5) is lived in card (6) (7) extruding in utilizing, and will go up lower casing with fastening bolt (10) and be fixed as one.
As Fig. 2.
According to the E-I characteristic of Zinc-oxide piezoresistor chip, impact life curve, that the power frequency withstand curve is chosen the Zinc-oxide piezoresistor chip performance is as follows:
V
1mA（DC） 390～430V
V
OIA／V
1mA≤2
Impulse current (8/20us) 〉=125A
Impact the life-span (125A, 8/20us)＞
Inferior
Time response velocity fails 20～40us
Under normal working voltage, can extrapolate the Zinc-oxide piezoresistor chip by Zinc-oxide piezoresistor chip volt-ampere curve and chargeability curve and can stably work the more than ten years.Temporary overvoltages such as atmospheric over-voltage and switching overvoltage appear in system; this overvoltage amplitude is higher; duration is shorter; the anxious poly-conducting of Zinc-oxide piezoresistor chip this moment shows low resistive state; and the terminal voltage amplitude of Zinc-oxide piezoresistor chip rises seldom, has protected electric equipment effectively.The Zinc-oxide piezoresistor chip tolerance that flows through that this kind overvoltage causes is 10
6Inferior.To this class temporary overvoltage Zinc-oxide piezoresistor chip is stable, the arc grounding overvoltage appears in system, resonance overvoltage, the center line that distribution transformer particularly occurs opens circuit with arbitrary phase line wrong or center line, make phase voltage become line voltage, this unusual power-frequency overvoltage is not high because of the overvoltage amplitude, but the duration is very long, and the hurried conducting of Zinc-oxide piezoresistor chip this moment shows low resistive state.By amp-second curve of Zinc-oxide piezoresistor chip power frequency withstand curve and quick-break protective tube as can be known; the Zinc-oxide piezoresistor chip went to pot and was the transient heat breakdown conditions this moment; electric current can reach tens amperes, and protective tube can fuse in 300ms, has protected electric equipment effectively.
Simultaneously can be designed to various forms of changeover plugs according to the needs of different power consumption equipments according to above-mentioned principle; promptly has plural pin hole at least; two or three latches; and can accomplishing to use one more; also can make different brackets current conversion plug according to the power of electrical appliance; also different voltage dependent resistor chips and characteristic curve can be selected, thereby various low-voltage electrical apparatuses can be protected.
Owing to adopt such scheme, adopt the Zinc-oxide piezoresistor chip than following superiority is arranged with varistor: the first, useful heat radiation improves the Zinc-oxide piezoresistor chip life-span behind the absorption overvoltage energy; The second, when the Zinc-oxide piezoresistor chip is the transient heat breakdown conditions, the smell and the resistance explosive sound that do not have encapsulating material to burn.In addition, adopt Zinc-oxide piezoresistor chip and fast acting fuse to be assembled into an integral body, can overcome for a certain reason that Zinc-oxide piezoresistor causes higher level's power cut-off accident after damaging under normal working voltage, accident can be confined to single electrical appliance scope.
This changeover plug type low-voltage electrical apparatus protector structure is simple, can play a protective role to various household electrical appliance and low voltage equipment instrument, instrument etc.
Below in conjunction with drawings and Examples utility model is further specified.
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the vertical section structural map of an embodiment of the present utility model.
Zinc-oxide piezoresistor chip (1) in Fig. 1, quick fuse protective tube (2) (3), thermistor (NTC) (4), luminous displaing part branch (5), electrical appliance (6).
Be a changeover plug type low-voltage electrical apparatus protector shown in Fig. 2, the latch with this changeover plug during application inserts in the supply socket jack, the electrical appliance attaching plug is inserted in the changeover plug to get final product again.This changeover plug comprises latch (1) (2), shell (3), melt disconnected pipe (4) fast, Zinc-oxide piezoresistor chip (5), inside and outside card (6) (7) (8) (9), firm bolt (10), two jacks (11) (12), simultaneously can be designed to the various forms changeover plug according to the needs of power consumption equipment, and can accomplish to use form one more according to above-mentioned principle.Also can make the changeover plug of different brackets electric current according to the power of electrical appliance.Thereby can protect various low-voltage electrical appliances, owing to will produce serious ablation during Zinc-oxide piezoresistor chip transient heat punch through damage, this product is the easy-consumed goods of low value in addition, sees that with regard to security standpoint uneasiness must make the reparation formula.
Claims (4)
1, a kind of low-voltage electrical apparatus protector; it includes latch (1) (2); shell (3); it is characterized in that the clamp made from spring leaf (13) clamps, connects an end that melts disconnected pipe (4) fast; firmly melt the other end of disconnected pipe (4) fast with spring leaf (9) extruding; Zinc-oxide piezoresistor chip (5) is lived in card (6) (7) extruding in utilizing, and will go up lower casing with fastening bolt (10) and be fixed as one.
2, a kind of low-voltage electrical apparatus protector according to claim 1 is characterized in that this low-voltage electrical apparatus protector is the changeover plug type.
3, a kind of low-voltage electrical apparatus protector according to claim 1 is characterized in that this changeover plug has plural pin hole, two to three latches at least.
4, a kind of low-voltage electrical apparatus protector according to claim 1 is characterized in that having at least in the utility model circuit one or two to melt disconnected pipe fast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91225193 CN2117656U (en) | 1991-09-23 | 1991-09-23 | Low voltage protector for electric appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91225193 CN2117656U (en) | 1991-09-23 | 1991-09-23 | Low voltage protector for electric appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2117656U true CN2117656U (en) | 1992-09-30 |
Family
ID=4931516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91225193 Granted CN2117656U (en) | 1991-09-23 | 1991-09-23 | Low voltage protector for electric appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2117656U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510484B (en) * | 2009-03-17 | 2011-03-16 | 西安智源电气有限公司 | Special-purpose chip for low-voltage apparatus |
| CN102545191A (en) * | 2010-11-23 | 2012-07-04 | 飞兆半导体公司 | Input power port protection component |
| CN106953211A (en) * | 2017-05-05 | 2017-07-14 | 南京普天鸿雁电器科技有限公司 | Elongation line socket |
-
1991
- 1991-09-23 CN CN 91225193 patent/CN2117656U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510484B (en) * | 2009-03-17 | 2011-03-16 | 西安智源电气有限公司 | Special-purpose chip for low-voltage apparatus |
| CN102545191A (en) * | 2010-11-23 | 2012-07-04 | 飞兆半导体公司 | Input power port protection component |
| CN106953211A (en) * | 2017-05-05 | 2017-07-14 | 南京普天鸿雁电器科技有限公司 | Elongation line socket |
| CN106953211B (en) * | 2017-05-05 | 2022-11-01 | 南京普天鸿雁电器科技有限公司 | Extended line socket |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |