CN204407853U - Laboratory power supply protective device - Google Patents
Laboratory power supply protective device Download PDFInfo
- Publication number
- CN204407853U CN204407853U CN201420832586.3U CN201420832586U CN204407853U CN 204407853 U CN204407853 U CN 204407853U CN 201420832586 U CN201420832586 U CN 201420832586U CN 204407853 U CN204407853 U CN 204407853U
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- China
- Prior art keywords
- current
- circuit
- laboratory
- comparator
- latching relay
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- 230000001681 protective effect Effects 0.000 title claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 230000009466 transformation Effects 0.000 claims abstract description 5
- 230000000052 comparative effect Effects 0.000 claims abstract description 4
- 238000004870 electrical engineering Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of laboratory power supply protective device, it is primarily of power circuit, magnetic latching relay, current detecting sample circuit, comparator and circuits for triggering are formed, 220V or 380V AC power transformation is 12V alternating current by power circuit, two-way is divided into after rectifying and wave-filtering, one tunnel is that magnetic latching relay and circuits for triggering are powered, another road powers to comparator after voltage stabilizing, current detecting sample circuit, in order to sampling current is sent into the in-phase input end of comparator by the current sampling in the supply line of laboratory, comparator carries out switch control rule according to comparative result to magnetic latching relay.Also comprise air residual current circuit breaker and reactor, reactor is for limiting excessive short circuit current.Laboratory power supply protective device solves understands the problem that Experiment of Electrical Engineering device in use changes fuse continually, improves the security performance of experimental provision, more convenient operation, and reduces use cost.
Description
Technical field
The utility model relates to a kind of apparatus for protecting power supply, specifically a kind of laboratory power supply protective device.
Background technology
The supply line of current student's electrician practical training apparatus, generally adopts 220V or 380V AC-powered; With fuse as the overcurrent of power supply or short-circuit protection.Although this protected mode is simply effective, when overcurrent or short circuit occur on road, carry out protective circuit with regard to blowout (fusible core) and do not burnt.Restore electricity and must change fuse, thus cumbersome.
The general student in school is that beginner is unfamiliar with circuit, therefore cumbersome, Chang Yinwei wrong line and cause and burn fuse.Frequently fuse is changed, not only inconvenience but also uneconomical in experimentation.
Utility model content
The purpose of this utility model is to provide a kind of easy to use, safe and reliable, laboratory power supply protective device that cost is low.
For achieving the above object, the technical scheme that the utility model adopts is:
Laboratory power supply protective device, it is primarily of power circuit, magnetic latching relay, current detecting sample circuit, comparator and circuits for triggering are formed, in described magnetic latching relay insert experiment room supply line, in order to connect laboratory supply line and to cut off, 220V or 380V AC power transformation is 12V alternating current by described power circuit, two-way is divided into after rectifying and wave-filtering, one tunnel is that described magnetic latching relay and circuits for triggering are powered, another road powers to after voltage stabilizing described comparator, described current detecting sample circuit, in order to sampling current is sent into the in-phase input end of comparator by the current sampling in the supply line of laboratory, described comparator carries out switch control rule according to comparative result to magnetic latching relay.
Laboratory power supply protective device also comprises air residual current circuit breaker, in described air residual current circuit breaker insert experiment room supply line.
Laboratory power supply protective device also comprises reactor, and described reactor is serially connected on the live wire in the supply line of laboratory, for limiting excessive short circuit current.
The beneficial effects of the utility model: laboratory power supply protective device solves understands the problem that Experiment of Electrical Engineering device in use changes fuse continually, improves the security performance of experimental provision, more convenient operation, and reduces use cost.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is the electrical schematic diagram shown in Fig. 1.
In figure: 1, air residual current circuit breaker; 2, power circuit; 3, reactor; 4, magnetic latching relay; 5, current detecting sample circuit; 6, comparator; 7, circuits for triggering.
Embodiment
As shown in Figure 1, laboratory power supply protective device, it is primarily of air residual current circuit breaker 1, power circuit 2, reactor 3, magnetic latching relay 4, current detecting sample circuit 5, comparator 6 and circuits for triggering 7 are formed, in described magnetic latching relay 4 insert experiment room supply line, in order to connect laboratory supply line and to cut off, 220V or 380V AC power transformation is 12V alternating current by described power circuit 2, two-way is divided into after rectifying and wave-filtering, one tunnel is that described magnetic latching relay 4 and circuits for triggering 7 are powered, another road powers to after voltage stabilizing described comparator 6, described current detecting sample circuit 5, in order to sampling current is sent into the in-phase input end of comparator 6 by the current sampling in the supply line of laboratory, described comparator 6 carries out switch control rule according to comparative result to magnetic latching relay 4.
In described air residual current circuit breaker insert experiment room supply line.Air residual current circuit breaker function in circuit has three: one, as battery main switch for controlling the break-make of power supply.Two, as earth leakage protective, cut off the electricity supply when electric leakage occurs circuit.Three, as the second class protection of short circuit, protect dress malfunctioning when being short-circuited, when can not disconnect, excessive electric current makes breaker actuation cutting-off of short-circuit electric current.
Described reactor is serially connected on the live wire in the supply line of laboratory, in circuit as current limiting element, for limiting excessive short circuit current; Prevent from, because short circuit current is excessive, causing the action of upper level protective device and causing large-area power-cuts.
Operation principle: laboratory power supply protective device can in order to three-phase electricity circuit, also can in order to two phase electricity circuit, the present embodiment is for two-phase electricity, electrical schematic diagram as shown in Figure 2, the transformer T1 of power circuit is 12V alternating current 220V AC power transformation, become the direct current of about 15V through D1, C1, rectifying and wave-filtering, a road is to magnetic latching relay and tactile circuit supply, and another road is through U1(7812) power to comparator after voltage stabilizing; Current detecting sample circuit: form current detecting sample circuit primarily of current transformer T2, resistance R1, R2, R3, W1, diode D2, electric current in circuit is become the in-phase input end that direct voltage sends into comparator U2, makes comparisons with the reference voltage of inverting terminal; Comparator is made up of voltage comparator ic, LM139, R4, R5, and circuits for triggering are made up of Q1, J1, SB1.When after power turn-on master switch, when pressing start button SB1, the coil input positive voltage of magnetic latching relay, the closing of contact also keeps.When the load current of circuit is less than set point, the output voltage of current detection circuit is less than the voltage of comparator end of oppisite phase, and U2 output low level Q1 ends, normal input power.When output current exceedes set point; the output voltage of current detection circuit is greater than the voltage of comparator end of oppisite phase; U2 exports high level Q1 conducting, J1 adhesive, and the coil input reverse voltage contact of magnetic latching relay CJ disconnects cutting off the electricity supply to be protected laboratory supply line.
The above is preferred implementation of the present utility model; certainly the interest field of the utility model can not be limited with this; should be understood that; for those skilled in the art; the technical solution of the utility model is modified or equivalent replacement, do not depart from the protection range of technical solutions of the utility model.
Claims (3)
1. a laboratory power supply protective device, it is characterized in that: it is primarily of power circuit, magnetic latching relay, current detecting sample circuit, comparator and circuits for triggering are formed, in described magnetic latching relay insert experiment room supply line, in order to connect laboratory supply line and to cut off, 220V or 380V AC power transformation is 12V alternating current by described power circuit, two-way is divided into after rectifying and wave-filtering, one tunnel is that described magnetic latching relay and circuits for triggering are powered, another road powers to after voltage stabilizing described comparator, described current detecting sample circuit, in order to sampling current is sent into the in-phase input end of comparator by the current sampling in the supply line of laboratory, described comparator carries out switch control rule according to comparative result to magnetic latching relay.
2. laboratory power supply protective device according to claim 1, is characterized in that: also comprise air residual current circuit breaker, in described air residual current circuit breaker insert experiment room supply line.
3. laboratory power supply protective device according to claim 2, is characterized in that: also comprise reactor, and described reactor is serially connected on the live wire in the supply line of laboratory, for limiting excessive short circuit current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420832586.3U CN204407853U (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420832586.3U CN204407853U (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204407853U true CN204407853U (en) | 2015-06-17 |
Family
ID=53431688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420832586.3U Expired - Fee Related CN204407853U (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204407853U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466892A (en) * | 2014-12-25 | 2015-03-25 | 丁柳信 | Laboratory power supply protection device |
-
2014
- 2014-12-25 CN CN201420832586.3U patent/CN204407853U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466892A (en) * | 2014-12-25 | 2015-03-25 | 丁柳信 | Laboratory power supply protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20151225 |
|
| EXPY | Termination of patent right or utility model |