CN103490237B - Leakage protecting plug with overtemperature detection - Google Patents
Leakage protecting plug with overtemperature detection Download PDFInfo
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- CN103490237B CN103490237B CN201310454483.8A CN201310454483A CN103490237B CN 103490237 B CN103490237 B CN 103490237B CN 201310454483 A CN201310454483 A CN 201310454483A CN 103490237 B CN103490237 B CN 103490237B
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Abstract
The invention discloses a kind of leakage protecting plug with overtemperature detection, including electrical apparatus release, rectification circuit, reduction voltage circuit, hookup, first magnetic induction loop, first amplifying circuit, mu balanced circuit, backward voltage isolation circuit and ghyristor circuit, also include the second amplifying circuit, second magnetic induction loop and the 3rd magnetic induction loop, the secondary coil of the first magnetic induction loop connects the first amplifying circuit, the primary coil two ends of the second magnetic induction loop connect zero line and ground wire respectively, secondary coil one end of second magnetic induction loop connects the second amplifying circuit, it is provided with permutator between the other end and the second amplifying circuit, 3rd magnetic induction loop one end connects permutator, the other end connects the zero line of outfan.Invention increases the function of leakage protecting plug so that it is can by selecting different magnetic induction loops to realize different earth leakage protective modes, it is to avoid individual user family is complicated and cause mistrip because of zero line or ground wire electrification situation.
Description
Technical field
The present invention relates to electric security protector device field, particularly to a kind of leakage protecting plug with overtemperature detection.
Background technology
The existing plug with earth wire live protector; such as all-purpose leakage protection plug; except detection between load phase, zero line with or without leakage current except; also whether detection ground wire has leakage current to pass through; when separately or concurrently there is leakage current in phase line, zero line or ground wire, two detection coil all can make electrical apparatus release immediately by phase, zero, ground wire all off, namely cut off the electricity supply; thus effectively having ensured personal safety, therefore oneself is widely applied in household electrical appliance.
But, above-mentioned all-purpose leakage protection plug is also defective, because ground wire is to share often; it is often with low-voltage, and the resistance of ground wire only has several ohm, according to Current calculation formula I=U/R; flow to the circuit of ground wire at tens milliamperes to several peaces not etc., therefore easily caused by mistrip.
Disclose a kind of leakage protecting plug detecting ground wire voltage mode before the present inventor, efficiently solve the problems referred to above, but some family there will be charged abnormal conditions because of transformation station zero line, this is also easily caused by mistrip.
Summary of the invention
(1) to solve the technical problem that
Present invention aim to overcome disadvantages mentioned above, it is desirable to provide a kind of leakage protecting plug with overtemperature detection.
(2) technical scheme
For solving the problems referred to above, the present invention proposes a kind of leakage protecting plug with overtemperature detection, including electrical apparatus release, rectification circuit, reduction voltage circuit, hookup, first magnetic induction loop, first amplifying circuit, mu balanced circuit, backward voltage isolation circuit and ghyristor circuit, also include the second amplifying circuit, second magnetic induction loop and the 3rd magnetic induction loop, the secondary coil of described first magnetic induction loop connects described first amplifying circuit, the primary coil two ends of described second magnetic induction loop connect zero line and ground wire respectively, secondary coil one end of described second magnetic induction loop connects described second amplifying circuit, it is provided with permutator between the other end and described second amplifying circuit, described 3rd magnetic induction loop one end connects described permutator, the other end connects the zero line of outfan.
Further, it is provided with sensing between described zero line and ground wire and eliminates circuit and ground wire electrification instruction.
Further, big resistance current limliting reduction voltage circuit it is provided with between the primary coil of described ground wire and described second magnetic induction loop.
Further, overtemperature sensing circuit it is provided with between described mu balanced circuit and the zero line of outfan.
Further, described overtemperature sensing circuit is also connected with described second amplifying circuit.
(3) beneficial effect
Compared with prior art; the invention have the advantages that the function that invention increases leakage protecting plug; can by selecting different magnetic induction loops to realize ground line current detection mode or ground wire voltage detection mode, it is to avoid individual user family is complicated and cause mistrip because of zero line or ground wire electrification situation.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the leakage protecting plug with overtemperature detection of the present invention；
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention one；
Fig. 3 is the circuit theory diagrams of the embodiment of the present invention two.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Embodiment one
nullAs shown in Figure 1，The leakage protecting plug with overtemperature detection of the present invention，Including electrical apparatus release、Rectification circuit DC、Reduction voltage circuit、Hookup、First magnetic induction loop ZCT1、First amplifying circuit IC1、Mu balanced circuit、Backward voltage isolation circuit and ghyristor circuit，Wherein，Reduction voltage circuit is dropping resistor R4，Hookup includes the resistance R3 and button AN of series connection，Mu balanced circuit includes stabilivolt D3 and resistance R5，Backward voltage isolation circuit is diode D1 and diode D2，Also include the second amplifying circuit IC2、Second magnetic induction loop ZCT2 and the three magnetic induction loop ZCT3，The primary coil two ends of described first magnetic induction loop ZCT1 connect live wire L and the hookup of outfan respectively，The secondary coil of described first magnetic induction loop ZCT1 connects described first amplifying circuit IC1，The primary coil two ends of described second magnetic induction loop ZCT2 connect zero line N and ground wire E respectively，Secondary coil one end of described second magnetic induction loop ZCT2 connects described second amplifying circuit IC2，It is provided with permutator K1 between the other end and described second amplifying circuit IC2，Described 3rd magnetic induction loop ZCT3 one end connects described permutator K1，The other end connects the zero line N of outfan，Described overtemperature sensing circuit is connected between the zero line N of mu balanced circuit and outfan，Also it is connected with described second amplifying circuit IC2.Circuit theory diagrams are referring to Fig. 2.
It is provided with sensing between described zero line N and ground wire E and eliminates circuit and ground wire electrification instruction, it is electric capacity C1 that sensing eliminates circuit, for eliminating the induced voltage between zero line N and ground wire E, ground wire electrification instruction includes the display lamp H and current-limiting resistance R1 of series connection, and between zero line N and ground wire E, charged rear indicator light H lights.
Big resistance R2 it is provided with as current limliting reduction voltage circuit between the primary coil of described ground wire E and described second magnetic induction loop ZCT2.
Being provided with overtemperature sensing circuit between described mu balanced circuit DC and the zero line N of outfan, described overtemperature sensing circuit is also connected with described second amplifying circuit IC2.Wherein, overtemperature sensing circuit includes critesistor RT and resistance R6, after overtemperature sensing circuit arrives uniform temperature, and critesistor RT resistance decrease, the second amplifying circuit IC2 triggers the control pole of controllable silicon SCR, makes controllable silicon SCR turn on, so that electrical apparatus release action.
When the present invention works, user can pass through permutator K and select required detection of electrical leakage mode.When permutator K1 connects the second magnetic induction loop, namely have selected ground wire voltage detection, in the present embodiment, ground wire voltage is more than 50V, the second magnetic induction loop ZCT2 secondary coil just can be made to produce induced voltage, induced voltage makes controllable silicon SCR trigger electrode charged after the second amplifying circuit IC2, so that controllable silicon SCR conducting, make the solenoid on electrical apparatus release be energized, and then trigger electrical apparatus release disconnecting circuit；When permutator K1 connects three magnetic induction loops, i.e. only selectively line current detection, in the present embodiment when ground line current is more than 30mA, 3rd magnetic induction loop ZCT3 produces induced voltage, make controllable silicon SCR trigger electrode charged after the second amplifying circuit IC2, so that controllable silicon SCR conducting, make the solenoid on electrical apparatus release be energized, and then trigger electrical apparatus release disconnecting circuit.Invention increases the function of leakage protecting plug so that it is can by selecting different magnetic induction loops to realize different earth leakage protective modes, it is to avoid individual user family is complicated and cause mistrip because of zero line or ground wire electrification situation.
Embodiment two
The present embodiment and embodiment one are essentially identical, it is different in that: permutator is K1 and K2, K1 and K2 is gang switch, circuit theory diagrams are as shown in Figure 3, when K1 and K2 is also turned on the second magnetic induction loop ZCT2, namely have selected ground wire voltage detection, in the present embodiment, ground wire voltage is more than 50V, the second magnetic induction loop ZCT2 secondary coil just can be made to produce induced voltage, induced voltage makes controllable silicon SCR trigger electrode charged after the second amplifying circuit IC2, so that controllable silicon SCR conducting, the solenoid on electrical apparatus release is made to be energized, and then trigger electrical apparatus release disconnecting circuit；When K1 and K2 is also turned on the 3rd magnetic induction loop ZCT3, i.e. only selectively line current detection, when ground line current is more than 30mA, 3rd magnetic induction loop ZCT3 produces induced voltage, make controllable silicon SCR trigger electrode charged after the second amplifying circuit IC2, so that controllable silicon SCR conducting, make the solenoid on electrical apparatus release be energized, and then trigger electrical apparatus release disconnecting circuit.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (1)
1. the leakage protecting plug with overtemperature detection, including electrical apparatus release, rectification circuit, reduction voltage circuit, hookup, first magnetic induction loop, first amplifying circuit, mu balanced circuit, backward voltage isolation circuit and ghyristor circuit, it is characterized in that: also include the second amplifying circuit, second magnetic induction loop and the 3rd magnetic induction loop, the secondary coil of described first magnetic induction loop connects described first amplifying circuit, the primary coil two ends of described second magnetic induction loop connect zero line and ground wire respectively, secondary coil one end of described second magnetic induction loop connects described second amplifying circuit, it is provided with permutator between the other end and described second amplifying circuit, described 3rd magnetic induction loop one end connects described permutator, the other end connects the zero line of outfan；
It is provided with sensing between described zero line and ground wire and eliminates circuit and ground wire electrification instruction；
Big resistance current limliting reduction voltage circuit it is provided with between the primary coil of described ground wire and described second magnetic induction loop；
Overtemperature sensing circuit it is provided with between described mu balanced circuit and the zero line of outfan；
Described overtemperature sensing circuit is also connected with described second amplifying circuit；
Overtemperature sensing circuit includes critesistor RT and resistance R6, and after overtemperature sensing circuit arrives uniform temperature, critesistor RT resistance decrease, the second amplifying circuit triggers the control pole of ghyristor circuit, makes ghyristor circuit turn on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454483.8A CN103490237B (en) | 2013-09-27 | 2013-09-27 | Leakage protecting plug with overtemperature detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310454483.8A CN103490237B (en) | 2013-09-27 | 2013-09-27 | Leakage protecting plug with overtemperature detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103490237A CN103490237A (en) | 2014-01-01 |
| CN103490237B true CN103490237B (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310454483.8A Active CN103490237B (en) | 2013-09-27 | 2013-09-27 | Leakage protecting plug with overtemperature detection |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514610Y (en) * | 2001-09-25 | 2002-10-02 | 黄南山 | Low-voltage large current heater with abnormal protective circuit |
| US6525914B1 (en) * | 1999-05-26 | 2003-02-25 | Technology Research Corporation | Protection system for devices connected to an alternating current electrical power supply |
| CN202259980U (en) * | 2011-09-23 | 2012-05-30 | 钱加灿 | Plug with ground wire live protection mechanism |
| CN103066456A (en) * | 2012-11-27 | 2013-04-24 | 钱加灿 | Protective plug capable of checking leakage of electricity |
| CN203536652U (en) * | 2013-09-27 | 2014-04-09 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug with overtemperature detection |
-
2013
- 2013-09-27 CN CN201310454483.8A patent/CN103490237B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6525914B1 (en) * | 1999-05-26 | 2003-02-25 | Technology Research Corporation | Protection system for devices connected to an alternating current electrical power supply |
| CN2514610Y (en) * | 2001-09-25 | 2002-10-02 | 黄南山 | Low-voltage large current heater with abnormal protective circuit |
| CN202259980U (en) * | 2011-09-23 | 2012-05-30 | 钱加灿 | Plug with ground wire live protection mechanism |
| CN103066456A (en) * | 2012-11-27 | 2013-04-24 | 钱加灿 | Protective plug capable of checking leakage of electricity |
| CN203536652U (en) * | 2013-09-27 | 2014-04-09 | 余姚市嘉荣电子电器有限公司 | Electric leakage protection plug with overtemperature detection |
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| Publication number | Publication date |
|---|---|
| CN103490237A (en) | 2014-01-01 |
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