CN2194029Y - Electronic arc-extinguishing means - Google Patents
Electronic arc-extinguishing means Download PDFInfo
- Publication number
- CN2194029Y CN2194029Y CN 94212162 CN94212162U CN2194029Y CN 2194029 Y CN2194029 Y CN 2194029Y CN 94212162 CN94212162 CN 94212162 CN 94212162 U CN94212162 U CN 94212162U CN 2194029 Y CN2194029 Y CN 2194029Y
- Authority
- CN
- China
- Prior art keywords
- arc
- utility
- main contact
- model
- streamline circle
- 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 - Fee Related
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- Protection Of Static Devices (AREA)
Abstract
The utility model relates to an electronic arc-extinguishing means, which is used on the control switch of a low-voltage electrical appliance, particularly an alternating current contactor. The utility model is a means which extinguishes arc to a main contact when current is broken. The utility model is composed of the silicon controlled rectifier SCR of an arc-extinguishing device and a current detecting coil L. The silicon controlled rectifier SCR of an arc-extinguishing device bridges the two ends of the main contact. The two ends of the current detecting coil L are connected with the gate electrode of a silicon controlled rectifier. A load line is penetrated through the current detecting coil L. The utility model can effectively prevent electric arc from welding when the current is broken and make the service life and operation frequency of the alternating current contactor raised.
Description
The utility model relates to a kind of low-voltage electrical apparatus control switch, particularly A.C. contactor of being used for, and its main contact is carried out the electronic arc-suppressor of arc extinguishing when breaking current.
The arc fusion welding phenomenon can take place in A.C. contactor when breaking current, its working life is shortened greatly, for arc extinguishing when the breaking current, what use is some mechanical arc-control devices, as potter's clay arc-extinguish chamber, grid sheet arc-extinguish chamber etc., however, also have only thousands of extremely tens thousand of times the useful life of A.C. contactor, and frequency of operation is also lower.
The utility model is intended to propose a kind ofly can effectively overcome A.C. contactor the arc fusion welding phenomenon takes place when breaking current, improves the electronic arc-suppressor of A.C. contactor useful life and frequency of operation.
The electronic arc-suppressor that the utility model proposes is made up of arc extinguishing device controllable silicon SCR and inspection streamline circle L etc.Arc extinguishing device controllable silicon SCR (one-way SCR or bidirectional triode thyristor) is connected across the main contact two ends; inspection streamline circle L is a coil on the iron core skeleton; inspection streamline circle L two ends link to each other with the controllable silicon SCR gate pole; load line passes from the middle part of inspection streamline circle L; simultaneously; with the voltage stabilizing didoe after two butt joints and at inspection streamline circle L two ends, be unlikely to damage because of the variation of load current with protection arc extinguishing device controllable silicon SCR gate pole.
Because electronic arc-suppressor cross-over connection A.C. contactor main contact two ends, when the frequent disjunction load of A.C. contactor, the arc fusion welding phenomenon can not take place in main contact, thereby improves the useful life and the frequency of operation of A.C. contactor greatly.
Below in conjunction with drawings and Examples the utility model is further described.
Accompanying drawing is the circuit theory diagrams of the utility model embodiment.
With reference to accompanying drawing, bidirectional triode thyristor SCR1, SCR2, SCR3 are connected on A.C. contactor (KM) three-phase main contact two ends respectively, article three, load line A, B, C pass from three inspection streamline circle L1, L2, L3 middle parts respectively, inspection streamline circle is a coil on the iron core skeleton, inspection streamline circle two ends join with the gate pole (the control utmost point and negative electrode) of bidirectional triode thyristor SCR respectively, and three pairs of voltage stabilizing didoes (D1 and D2, D3 and D4, D5 and D6) docks the back in twos respectively and at three two ends of examining streamline circle L1, L2, L3.After A.C. contactor main contact closure, the voltage at bidirectional triode thyristor SCR two ends reduces to zero (also having only the millivolt level when big electric current), though trigger end has controlled signal, and not conducting, load current flows through from main contact.When the main contact breaking current, its both end voltage rises, (this conducting voltage is the conducting voltage of bidirectional triode thyristor in bidirectional triode thyristor SCR conducting, be about 1～3 volt), the main contact both end voltage is very low, can't produce electric arc, reduces to zero rapidly owing to pass the load current of inspection streamline circle, bidirectional triode thyristor loses trigger voltage rapidly and turn-offs, and the arc extinguishing process finishes.In order to protect the extremely unlikely variation of bidirectional triode thyristor scr gate to damage because of load current, in triggering the loop, be provided with voltage stabilizing didoe D1, the D2 of butt joint, trigger voltage is limited in 3 volts, the protection bidirectional triode thyristor scr gate utmost point is not damaged.
Claims (3)
1, a kind of low-voltage electrical apparatus control switch that is used for, A.C. contactor particularly, when breaking current, its main contact is carried out the electronic arc-suppressor of arc extinguishing, form by arc extinguishing device controllable silicon SCR and inspection streamline circle etc., it is characterized in that arc extinguishing device controllable silicon SCR is connected across the main contact two ends, inspection streamline circle L two ends link to each other with the controllable silicon SCR gate pole, and load line passes from the middle part of inspection streamline circle L.
2, electronic arc-suppressor according to claim 1 is characterized in that examining streamline circle L and is a coil on the iron core skeleton.
3, electronic arc-suppressor according to claim 1 and 2, it is characterized in that two after the butt joint voltage stabilizing didoe D1, D2 and at inspection streamline circle L two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212162 CN2194029Y (en) | 1994-05-14 | 1994-05-14 | Electronic arc-extinguishing means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212162 CN2194029Y (en) | 1994-05-14 | 1994-05-14 | Electronic arc-extinguishing means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2194029Y true CN2194029Y (en) | 1995-04-05 |
Family
ID=33829105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94212162 Expired - Fee Related CN2194029Y (en) | 1994-05-14 | 1994-05-14 | Electronic arc-extinguishing means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2194029Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428117A (en) * | 2014-12-11 | 2016-03-23 | 广州市金矢电子有限公司 | Arc extinguishing device |
| CN106786464A (en) * | 2017-01-12 | 2017-05-31 | 徐向宇 | Active defense formula sensor insulation blocking method and its isolation protective circuit |
-
1994
- 1994-05-14 CN CN 94212162 patent/CN2194029Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428117A (en) * | 2014-12-11 | 2016-03-23 | 广州市金矢电子有限公司 | Arc extinguishing device |
| WO2016091178A1 (en) * | 2014-12-11 | 2016-06-16 | 广州市金矢电子有限公司 | Arc extinguishing device |
| CN106786464A (en) * | 2017-01-12 | 2017-05-31 | 徐向宇 | Active defense formula sensor insulation blocking method and its isolation protective circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |