CN104466892A - Laboratory power supply protection device - Google Patents
Laboratory power supply protection device Download PDFInfo
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- CN104466892A CN104466892A CN201410817446.3A CN201410817446A CN104466892A CN 104466892 A CN104466892 A CN 104466892A CN 201410817446 A CN201410817446 A CN 201410817446A CN 104466892 A CN104466892 A CN 104466892A
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Abstract
The invention discloses a laboratory power supply protection device which is mainly composed of a power circuit, a magnetic latching relay, a current detection sampling circuit, a comparator and a trigger circuit. The power circuit converts a 220 V or 380 V alternating current power supply into 12 V alternating current power through voltage transformation, the alternating current power is subjected to rectification filtering to be divided into two ways of power, one way of power is used for the magnetic latching relay and the trigger circuit, and the other way of power is used for the comparator after being subjected to voltage stabilization. The current detection sampling circuit is used for sampling current in a laboratory power supply circuit and transmitting sampled current to the same-phase input end of the comparator, and the comparator conducts switch control on the magnetic latching relay according to a comparative result. The laboratory power supply protection device further comprises an air residual-current circuit breaker and an electric reactor, wherein the electric reactor is used for limiting too large short-circuit current. The laboratory power supply protection device solves the problem that a fuse is frequently replaced in the using process of an electrical engineering experiment device, improves the safety performance of the experiment device, is more convenient to operate and reduces the usage cost.
Description
Technical field
The present invention 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.
Summary of the invention
The object of this invention 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 solution adopted in the present invention 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.
Beneficial effect of the present invention: 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 present invention is described in further detail:
Fig. 1 is circuit block diagram of the present invention;
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 the preferred embodiment of the present invention; certainly the interest field of the present invention can not be limited with this; should be understood that; for those skilled in the art; technical scheme of the present invention is modified or equivalent replacement, do not depart from the protection range of technical solution of the present invention.
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 |
|---|---|---|---|
| CN201410817446.3A CN104466892A (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410817446.3A CN104466892A (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104466892A true CN104466892A (en) | 2015-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410817446.3A Pending CN104466892A (en) | 2014-12-25 | 2014-12-25 | Laboratory power supply protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104466892A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964818A (en) * | 2018-01-03 | 2018-04-27 | 安图实验仪器(郑州)有限公司 | Line mark corresponding wire stranding machine |
| CN109617225A (en) * | 2018-12-18 | 2019-04-12 | 镇江中煤电子有限公司 | Mine power resource automatic power recovery device |
Citations (7)
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|---|---|---|---|---|
| CN1147714A (en) * | 1996-04-29 | 1997-04-16 | 安徽省宿州市煤矿电器厂 | Short-circuit protector for mine lighting transformer |
| CN2432713Y (en) * | 2000-05-01 | 2001-05-30 | 齐宇庆 | Non-fuse safety device |
| CN201522954U (en) * | 2009-10-28 | 2010-07-07 | 何维权 | Novel knife-switch circuit breaker without fuse |
| CN101807467A (en) * | 2010-03-19 | 2010-08-18 | 上海东沪电器自动化设备厂 | Inductive reactor |
| CN202616736U (en) * | 2012-06-20 | 2012-12-19 | 傅清河 | Electrical signal induction controller |
| CN204046140U (en) * | 2014-08-27 | 2014-12-24 | 郑州众智科技股份有限公司 | Inverse probability peculiar to vessel and overcurrent protection module |
| CN204407853U (en) * | 2014-12-25 | 2015-06-17 | 丁柳信 | Laboratory power supply protective device |
-
2014
- 2014-12-25 CN CN201410817446.3A patent/CN104466892A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147714A (en) * | 1996-04-29 | 1997-04-16 | 安徽省宿州市煤矿电器厂 | Short-circuit protector for mine lighting transformer |
| CN2432713Y (en) * | 2000-05-01 | 2001-05-30 | 齐宇庆 | Non-fuse safety device |
| CN201522954U (en) * | 2009-10-28 | 2010-07-07 | 何维权 | Novel knife-switch circuit breaker without fuse |
| CN101807467A (en) * | 2010-03-19 | 2010-08-18 | 上海东沪电器自动化设备厂 | Inductive reactor |
| CN202616736U (en) * | 2012-06-20 | 2012-12-19 | 傅清河 | Electrical signal induction controller |
| CN204046140U (en) * | 2014-08-27 | 2014-12-24 | 郑州众智科技股份有限公司 | Inverse probability peculiar to vessel and overcurrent protection module |
| CN204407853U (en) * | 2014-12-25 | 2015-06-17 | 丁柳信 | Laboratory power supply protective device |
Non-Patent Citations (1)
| Title |
|---|
| 黄永红: "《低压电器》", 31 July 2007 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964818A (en) * | 2018-01-03 | 2018-04-27 | 安图实验仪器(郑州)有限公司 | Line mark corresponding wire stranding machine |
| CN109617225A (en) * | 2018-12-18 | 2019-04-12 | 镇江中煤电子有限公司 | Mine power resource automatic power recovery device |
| CN109617225B (en) * | 2018-12-18 | 2023-04-25 | 镇江中煤电子有限公司 | Automatic power supply re-energizing device for mine |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |