CN201018264Y - Electric leakage protection circuit with life termination detecting and display function - Google Patents
Electric leakage protection circuit with life termination detecting and display function Download PDFInfo
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- CN201018264Y CN201018264Y CNU2007200050684U CN200720005068U CN201018264Y CN 201018264 Y CN201018264 Y CN 201018264Y CN U2007200050684 U CNU2007200050684 U CN U2007200050684U CN 200720005068 U CN200720005068 U CN 200720005068U CN 201018264 Y CN201018264 Y CN 201018264Y
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Abstract
The utility model discloses an earth leakage protection circuit capable of service life termination detection and display function, which is characterized in that: the utility model comprises an analog leakage current generation circuit that can automatically generate analog leakage current without operating component. A zero line for a power source input end of a leakage protection socket is connected to a live for the power source input end via an analog leakage current switch linked to a resetting press button and an analog leakage current limiting resistance, so as to form the analog leakage current generation circuit. A power output indicator is connected between the live line and zero line of a single-phase three-line power source socket on the surface of the leakage protection socket; a resetting indicator is connected in series in a thyristor switching loop to indicate whether the service life of the leakage protection socket is terminated or not, whether there is power output status or not. Therefore, with complete function and excellent safety performance, the utility model is able to guarantee the safety of user and the electric apparatus.
Description
Technical field
The utility model relates to a kind of leakage protection circuit with detection of electrical leakage, defencive function that is applied in the earth leakage protective socket; specifically, the utility model relates to and need not to operate the leakage protection circuit that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after a kind of power line in earth leakage protective socket power input and wall connects.This leakage protection circuit also has the function that stops the reverse wiring mistake.
Background technology
Along with the continuous development of earth leakage protective socket (being called for short GFCI) industry, people require more and more higher to the safety in utilization of earth leakage protective socket.Hope when its inner components and parts lost efficacy the forfeiture creepage protection function when its end-of-life, can in time be reminded the user in the use of earth leakage protective socket, change new product.
Yet; its inner leakage protection circuit of common in the market earth leakage protective socket; not only do not have life end checking function; and; when its end-of-life, concerning the user without any prompt facility, its reset button still can reset; the single-phase three-wire power supply output plughole of the load output of earth leakage protective socket and receptacle face still has power supply output, misleads the user and continues to use.When leaky occurring,, very easily cause the get an electric shock generation of dead accident of user because this earth leakage protective socket do not have any protective effect.
In addition, common in the market its inner leakage protection circuit of earth leakage protective socket does not also have the function that stops the reverse wiring mistake.When the installer linked to each other the power line in the wall mistakenly with the load output of earth leakage protective socket, under the situation of not pushing reset button, the single-phase three-wire power supply output plughole on earth leakage protective socket surface promptly had power supply output.When leaky appears in electrical appliance work, because not work of leakage current detection protection circuit,, very easily cause the get an electric shock generation of dead accident of user so this earth leakage protective socket does not have any protective effect.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provide a kind of be applied in the earth leakage protective socket, after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate any parts and just can whether still have the leakage protection circuit that creepage protection function detected and showed testing result to earth leakage protective socket automatically.When the earth leakage protective socket inner member is intact when not having end-of-life, this leakage protection circuit can make homing light bright, and expression can be set up correct reset mechanism automatically can reset reset button, after resetting, the power supply output indicator is bright, illustrates that earth leakage protective socket can operate as normal; When earth leakage protective socket inner member open circuit or short circuit were end-of-life, the utility model leakage protection circuit did not work by homing light and represents this earth leakage protective socket end-of-life, the earth leakage protective socket of reminding the user in time more to renew.
Another purpose of the present utility model provides a kind of leakage protection circuit that stops reverse wiring mistake function that has; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output; this leakage protection circuit is not worked, and the power supply output plughole of the power input of earth leakage protective socket and receptacle face does not all have power supply output.
For achieving the above object, the utility model is by the following technical solutions: a kind of leakage protection circuit with life-span stop detection and Presentation Function is characterized in that: this leakage protection circuit includes one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;
This simulation leakage current generating circuit is made of simulation leakage current switch, the simulation leakage current current-limiting resistance with the reset button interlock;
Earth leakage protective socket power input zero line constitutes this and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically through linking to each other with the power input live wire with simulation leakage current switch, the simulation leakage current current-limiting resistance of reset button interlock;
When the reset button of earth leakage protective socket was in trip status, described simulation leakage current switch was in closure state; When reset button was in reset mode, described simulation leakage current switch was in off-state.
This leakage protection circuit also include be used to represent earth leakage protective socket whether end-of-life homing light and be used to represent whether earth leakage protective socket has the power supply output indicator of power supply output;
Described homing light is connected in the leakage protection circuit;
Described power supply output indicator is connected between the live wire, zero line of the single-phase three-wire supply hub on earth leakage protective socket surface.
This leakage protection circuit by the differential differentiating transformer, the control chip that are used for detecting leakage current, the tripping coil that is built-in with iron core, controllable silicon, with first, second, third, fourth switch that is connected on supply line, the sensitive switch of reset button interlock, form;
After the live wire of earth leakage protective socket power input, zero line pass differential differentiating transformer, link to each other with live wire, the zero line of the single-phase three-wire supply hub on earth leakage protective socket surface by first, second switch with the reset switch interlock; The live wire of the single-phase three-wire supply hub on earth leakage protective socket surface, zero line link to each other with live wire, the zero line of earth leakage protective socket power output end by the 3rd, the 4th switch of another group with the reset switch interlock;
The leakage current detection signal output of differential differentiating transformer links to each other with the signal input part of control chip, and the control signal output ends of control chip links to each other with the silicon controlled gate pole; The silicon controlled negative electrode links to each other with dc power cathode, and the silicon controlled anode links to each other with the power input live wire through sensitive switch, the tripping coil with the reset button interlock; The iron core that is built in the tripping coil makes reset button reset/or thread off by the mechanical trip gear in the earth leakage protective socket.
One end of described homing light links to each other with dc power cathode by controllable silicon, and the other end links to each other with the power input live wire by resistance, tripping coil.
The utlity model has that function is complete, fail safe good, safe in utilization, can guarantee the advantage of user's personal safety.
Description of drawings
Fig. 1 is the utility model leakage protection circuit physical circuit figure.
Embodiment
Fig. 1 is applied to the leakage protection circuit with detection of electrical leakage, defencive function in the earth leakage protective socket for the utility model, and the difference of this leakage protection circuit and common leakage protection circuit is: the disclosed leakage protection circuit of the utility model has need not to operate the function that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after the power line in earth leakage protective socket power input and the wall connects; And, also have the function that stops the reverse wiring mistake.
As shown in Figure 1, the disclosed leakage protection circuit of the utility model is mainly by the differential differentiating transformer L1 (200: 1) and the L2 (1000: 1) that are used to detect leakage current; control chip IC (LM1851/RV4145); be built-in with the tripping coil 26 (SOL) of iron core; controllable silicon V5; simulation leakage current K switch R-1 with earth leakage protective socket reset button RESET interlock; be connected on the K switch R-2-1 in the supply line; KR-2-2; KR-3-1; KR-3-2; sensitive switch KR-4; homing light V6; power supply output indicator V7 and simulation leakage current current-limiting resistance R88 and diode that some are relevant; resistance; compositions such as electric capacity.
After the live wire HOT of earth leakage protective socket power input LINE, zero line WHITE pass differential differentiating transformer L1, L2, link to each other with the single-phase three-wire supply hub on earth leakage protective socket surface by K switch R-2-1, KR-2-2 with reset switch RESET interlock.The live wire HOT of the single-phase three-wire supply hub on earth leakage protective socket surface, zero line WHITE link to each other with live wire HOT, the zero line WHITE of earth leakage protective socket power output end (load link) LOAD by K switch R-3-1, the KR-3-2 of another group with reset switch RESET interlock.
The leakage current detection signal output of differential differentiating transformer L1, L2 links to each other with the signal input part 2,3,5,4 of control chip IC, and the control signal output ends 1 of control chip IC links to each other with the gate pole of controllable silicon V5; The negative electrode of controllable silicon V5 links to each other with dc power cathode, and the anode of controllable silicon V5 links to each other with power input live wire HOT through sensitive switch KR-4, the tripping coil SOL with reset button RESET interlock; The iron core that is built in the tripping coil SOL makes reset button RESET reset/or thread off by the mechanical trip gear in the earth leakage protective socket, makes K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure/or disconnect.
Between single-phase three-wire supply hub live wire HOT, the zero line WHITE on earth leakage protective socket surface, be connected with a power supply output indicator V7.When the single-phase three-wire supply hub on the earth leakage protective socket surface had power supply output, V7 was bright for this power supply output indicator.Otherwise power supply output indicator V7 does not work.
Be in series with homing light V6 in the loop of control controllable silicon V5 conducting, the end of homing light V6 links to each other with dc power cathode by controllable silicon V5, and the other end links to each other with the power input live wire by resistance R 4, tripping coil SOL.Leakage protection circuit is working properly, constitute the element of leakage protection circuit such as controllable silicon V5, tripping coil SOL, differential differentiating transformer L1, when L2 is intact, controllable silicon V5 is intact can normally the time, and homing light V6 is bright, shows that earth leakage protective socket has creepage protection function; Otherwise; if the element of formation leakage protection circuit such as controllable silicon V5, tripping coil SOL, one of differential differentiating transformer L1, L2 break down; when causing leakage protection circuit end-of-life forfeiture creepage protection function; because leakage protection circuit can't form the loop; homing light V6 does not work; show leakage protection circuit end-of-life, remind the user should in time change new product.
The power input zero line WHITE that constitutes the utility model leakage protection circuit need not to operate the simulation leakage current generating circuit that any parts can produce a simulation leakage current automatically through linking to each other with power input live wire HOT with simulation leakage current K switch R-1, simulation leakage current current-limiting resistance R88, the tripping coil 26 (SOL) of reset button RESET interlock, constituting.When reset button RESET was in trip status, promptly earth leakage protective socket was in initial condition, and reset button RESET is not pressed, and the simulation leakage current K switch R-1 that links with reset button RESET is in closure state; When reset button RESET was in reset mode, the simulation leakage current K switch R-1 that links with reset button RESET was in off-state.
So, after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate the above-mentioned simulation leakage current generating of any parts circuit and can produce one automatically and simulate leakage current.
When the power input of earth leakage protective socket and the power line in the wall connect the back reset button when not resetting, need not to operate any parts, because KR-1 is in closure state, above-mentioned simulation leakage current generating circuit produces the simulation leakage current automatically.If earth leakage protective socket does not have end-of-life; leakage current flows through the magnetic test coil L2 (1000: 1) of differential differentiating transformer; magnetic test coil L2 induces a voltage signal; voltage signal is by coupling capacitance C9; be input to the signal input part 2 of control chip IC; 3; positive feedback outputs to 5 utmost points through IC; 4 utmost points (public pole); pass through C1 again; C2; L1 (200: 1) is fed to L2 (1000: 1); be transmitted back to the signal input part 3 of IC by C9; 2; after signal is exaggerated; export the gate pole of high-level control signal from 1 pin of IC to controllable silicon V5; controllable silicon V5 is triggered; the anode of controllable silicon V5 and negative electrode conducting, the homing light V6 that is connected in the indicating circuit between AB will be luminous, and expression earth leakage protective socket function is intact; have creepage protection function, reset button can reset.Otherwise if earth leakage protective socket end-of-life, then homing light V6 is not luminous, and reset button can not be reset all the time, and the prompting user should change earth leakage protective socket.
Intact at earth leakage protective socket, when not having end-of-life, as shown in Figure 1, press reset button, simulation leakage current K switch R-1 does not disconnect K switch R-4 closure as yet, this moment is because the closure of KR-4 makes A point and B point short circuit, the voltage at former AB two ends is added on the tripping coil (SOL) 26, makes tripping coil SOL have certain electric current to flow through and produces magnetic field, inner iron core 42 motions, promote the mechanical trip device action in the earth leakage protective socket, reset button RESET can be resetted; Simulation leakage current K switch R-1 disconnects, and the simulation leakage current disappears, and simultaneously, because K switch R-4 closure, so the light-emitting diode V6 that is connected between A point, B point is in cut-off state, the V6 lamp goes out; After reset button RESET resets, K switch R2-1, KR2-2, KR3-1, the KR3-2 closure is lighted the power supply output indicator V7 that connects between sub-socket load output end power live wire, the zero line, and the single-phase three-wire jack of expression receptacle face and load output all have power supply output.
If current leakage jack life termination, all the time there is not big electric current to flow through in the tripping coil (SOL) 26, can't produce magnetic field, its built-in movable core 42 is failure to actuate, mechanical trip device in the earth leakage protective socket also is failure to actuate, reset button RESET can't normally reset all the time, and the single-phase three-wire jack on earth leakage protective socket surface and load output all do not have power supply output, and power supply output indicator V7 does not work; Simultaneously, because current leakage jack life termination, its inner leakage protection circuit can't operate as normal, and controllable silicon V5 can't operate as normal, so homing light V5 does not work yet.
When function of socket is intact, after earth leakage protective socket correctly inserts power supply, press reset button RESET after, the supply hub of load end LOAD and receptacle face has electric power output, socket operate as normal.This moment is when having leakage current generating in the supply line; because power firestreak HOT and zero line WHITE pass described leakage current magnetic test coil L1 (200: 1) and L2 (1000: 1) simultaneously; two lines pass the vector of electric current of magnetic test coil and non-vanishing in the circuit; magnetic test coil induces the voltage signal of certain value at once; voltage signal is by coupling capacitance C9; be input to the signal input part 2 of IC1; 3; through behind the IC again by positive feedback output 5; 4 (public poles) pass through C1; C2; L1 (200: 1) is fed to L2 (1000: 1); be transmitted back to the signal input part 3 of IC1 by C9; 2; signal amplifies; export the gate pole of dropout control signal from 1 pin of IC to controllable silicon V5; controllable silicon V5 is triggered; positive pole and negative pole conducting; thereby making the positive pole place B point of controllable silicon V5 is electronegative potential; because this moment, K switch R-4 was a closure state; A point and B point are same point; because of the other end of coil 26 links to each other with power firestreak; the two ends of coil 26 will obtain the voltage of certain value; there is certain electric current to flow through; produce magnetic field; its inner iron core is done ballistic motion; make the mechanical trip device action in the earth leakage protective socket; reset button RESET is threaded off; Lian Dong K switch R-2-1 with it; KR-2-2; KR-3-1; KR-3-2 disconnects, the output of cutting off the electricity supply.
As shown in Figure 1, the utility model also has the defencive function that stops the reverse wiring mistake.As shown in the figure, link to each other by K switch R-3-1, KR-3-2 between the single-phase three-wire supply hub of earth leakage protective socket load output LOAD and receptacle face with reset button RESET interlock; The live wire of earth leakage protective socket input LINE; the live wire of the single-phase three-wire supply hub of zero line and receptacle face; between the zero line also be by with the K switch R-2-1 of reset button RESET interlock; KR-2-2 links to each other; so; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output LOAD; the utility model need not to operate circuit that any parts can produce the simulation leakage current automatically (by simulation leakage current K switch R-1; resistance R 88; tripping coil SOL constitutes) can't produce leakage current; control chip IC can't export control signal; not conducting of controllable silicon V5; there is not electric current to flow through in the tripping coil SOL; can't produce magnetic field and promote built-in iron core action wherein; the machinery trip gear is failure to actuate; automatically stop reset button to reset; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is in off-state all the time; can't be closed; the equal non-transformer output of the input LINE of earth leakage protective socket and the supply hub of receptacle face; homing light V6 and power supply output indicator V7 all do not work, and show wiring error.After the erector had only wiring correct, homing light V6 was just bright, and reset button just can reset, and power supply output indicator V7 is just bright, and the earth leakage protective socket power output end just has power supply output.
More than various situations, must suppress the generation of false triggering through being attempted by the filtering of the anti-interference capacitor C 7 between silicon controlled control end and the ground from the control signal of 1 pin of IC output.
In sum, because the utility model adopts above technical scheme, so the disclosed leakage protection circuit of the utility model has following outstanding advantage:
(1) after the power line in earth leakage protective socket power input and the wall connects; need not to operate any parts; just can produce the simulation leakage current automatically, detect earth leakage protective socket and whether still have the i.e. end-of-life whether of creepage protection function, and show testing result.
A. intact when the element that constitutes leakage protection circuit, when leakage protection circuit does not have end-of-life, homing light V6 is bright, and expression can be set up correct reset mechanism automatically can reset reset button, after resetting, V7 is bright for the power supply output indicator, illustrates that earth leakage protective socket can operate as normal;
B. when the element open circuit that constitutes leakage protection circuit or short circuit are end-of-life; homing light V6 does not work; represent this leakage protection circuit end-of-life; and stop reset button to reset, make the load output of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output.
(2) has the defencive function that stops the reverse wiring mistake.
When erector or electrician are connected to the power line in the wall on the earth leakage protective socket output mistakenly, stop reset button to reset automatically, the output of socket non-transformer, homing light V6 does not work, and shows wiring error.After the erector had only wiring correct, homing light V6 was just bright, and reset button just can reset, and the earth leakage protective socket power output end just has power supply output.
In a word, the utlity model has that function is complete, fail safe good, safe in utilization, can guarantee the advantage of user's personal safety.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.
Claims (4)
1. leakage protection circuit with life-span stop detection and Presentation Function is characterized in that: this leakage protection circuit includes one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;
This simulation leakage current generating circuit is made of simulation leakage current switch (KR-1), simulation leakage current current-limiting resistance (R88) with reset button (RESET) interlock;
Earth leakage protective socket power input zero line (WHITE) constitutes this and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically through linking to each other with power input live wire (HOT) with simulation leakage current switch (KR-1), the simulation leakage current current-limiting resistance (R88) of reset button (RESET) interlock;
When the reset button (RESET) of earth leakage protective socket when being in trip status, described simulation leakage current switch (KR-1) is in closure state; When reset button (RESET) when being in reset mode, described simulation leakage current switch (KR-1) is in off-state.
2. a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 1 is characterized in that: this leakage protection circuit also include be used to represent earth leakage protective socket whether end-of-life homing light (V6) and be used to represent whether earth leakage protective socket has the power supply output indicator (V7) of power supply output;
Described homing light (V6) is connected in the leakage protection circuit;
Described power supply output indicator (V7) is connected between the live wire (HOT), zero line (WHITE) of the single-phase three-wire supply hub on earth leakage protective socket surface.
3. a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 2 is characterized in that: this leakage protection circuit by the differential differentiating transformer, the control chip that are used for detecting leakage current, the tripping coil that is built-in with iron core, controllable silicon, with first, second, third, fourth switch that is connected on supply line (KR-2-1, KR-2-2, KR-3-1, KR-3-2), the sensitive switch (KR-4) of reset button interlock, form;
After the live wire (HOT) of earth leakage protective socket power input (LINE), zero line (WHITE) pass differential differentiating transformer (L1, L2), link to each other with live wire (HOT), the zero line (WHITE) of the single-phase three-wire supply hub on earth leakage protective socket surface by first, second switch (KR-2-1, KR-2-2) with reset switch (RESET) interlock; The live wire (HOT) of the single-phase three-wire supply hub on earth leakage protective socket surface, zero line (WHITE) link to each other with live wire (HOT), the zero line (WHITE) of earth leakage protective socket power output end (LOAD) by the 3rd, the 4th switch (KR-3-1, KR-3-2) of another group with reset switch (RESET) interlock;
The leakage current detection signal output of differential differentiating transformer (L1, L2) links to each other with the signal input part (2,3,5,4) of control chip (IC), and the control signal output ends (1) of control chip (IC) links to each other with the gate pole of controllable silicon (V5); The negative electrode of controllable silicon (V5) links to each other with dc power cathode, and the anode of controllable silicon (V5) links to each other with power input live wire (HOT) through sensitive switch (KR-4), the tripping coil (SOL) with reset button (RESET) interlock; The iron core that is built in the tripping coil (SOL) makes reset button (RESET) reset/or thread off by the mechanical trip gear in the earth leakage protective socket.
4. a kind of leakage protection circuit according to claim 3 with life-span stop detection and Presentation Function; it is characterized in that: an end of described homing light (V6) links to each other with dc power cathode by controllable silicon (V5), and the other end links to each other with the power input live wire by resistance (R4), tripping coil (SOL).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200050684U CN201018264Y (en) | 2007-02-14 | 2007-02-14 | Electric leakage protection circuit with life termination detecting and display function |
| US11/822,562 US7411766B1 (en) | 2007-02-14 | 2007-07-06 | Circuit interrupting device with end of life testing functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200050684U CN201018264Y (en) | 2007-02-14 | 2007-02-14 | Electric leakage protection circuit with life termination detecting and display function |
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| Publication Number | Publication Date |
|---|---|
| CN201018264Y true CN201018264Y (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200050684U Expired - Fee Related CN201018264Y (en) | 2007-02-14 | 2007-02-14 | Electric leakage protection circuit with life termination detecting and display function |
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| Country | Link |
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| CN (1) | CN201018264Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944716A (en) * | 2009-07-08 | 2011-01-12 | 黄华道 | Electricity leakage detection protective circuit |
| CN102208797A (en) * | 2010-03-29 | 2011-10-05 | 黄华道 | Novel protection circuit with electric leakage detection function |
| CN101931208B (en) * | 2009-06-19 | 2013-05-08 | 黄华道 | Leakage current detection protection circuit |
-
2007
- 2007-02-14 CN CNU2007200050684U patent/CN201018264Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931208B (en) * | 2009-06-19 | 2013-05-08 | 黄华道 | Leakage current detection protection circuit |
| CN101944716A (en) * | 2009-07-08 | 2011-01-12 | 黄华道 | Electricity leakage detection protective circuit |
| CN101944716B (en) * | 2009-07-08 | 2014-04-02 | 黄华道 | Electricity leakage detection protective circuit |
| CN102208797A (en) * | 2010-03-29 | 2011-10-05 | 黄华道 | Novel protection circuit with electric leakage detection function |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20150214 |
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| EXPY | Termination of patent right or utility model |