CN206697913U - Earth leakage protective device - Google Patents
Earth leakage protective device Download PDFInfo
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- CN206697913U CN206697913U CN201720344493.XU CN201720344493U CN206697913U CN 206697913 U CN206697913 U CN 206697913U CN 201720344493 U CN201720344493 U CN 201720344493U CN 206697913 U CN206697913 U CN 206697913U
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Abstract
The utility model discloses a kind of earth leakage protective device, and it includes：Switch module, it is coupled between input and output end, and switch module is used for electrically connected between control signal and output end；Leakage current test module, it includes switch driving member, and whether leakage current test module according to work period of switch driving member and detects leakage current signal come controlling switch module；And first selftest module, it is coupled to leakage current test module and periodically produces the self-test pulse signal for simulating leakage current signal, wherein, the first selftest module includes：The cycle timing circuit and self-test pulse signal circuit being mutually coupled, cycle timing circuit, which is used to control caused by self-test pulse signal, to be spaced.By implementing the technical solution of the utility model, the security of circuit can be greatly lifted.
Description
Technical field
The utility model belongs to electric field, more particularly to a kind of earth leakage protective device for possessing self-checking function.
Background technology
At present, increasing family or industrial electric apparatus are used in every field.For Electrical Safety, though people
Earth leakage protective device so is installed in power network output end or in the input of some household electrical appliance, and indicated in awake destination locations
Whether " being tested before use " be normal to supervise the function of user's test earth leakage protective device.But in use, because what is used
The factor such as environment difference or installation, even if people have carried out the operation of experiment before using to earth leakage protective device, earth leakage protective device is still
So deposit and lose earth leakage protective possibility in use, so as to cause the situation of danger to occur.For example, the electric heating in water tank
Pipe under water causes to get rusty or insulating barrier damage because long-term, then and caused electric leakage will be conductive with dampening, if this
When someone taking a shower, people will get an electric shock, and cause personal injury.
Therefore, a kind of earth leakage protective device for possessing self-checking function is needed badly.
Utility model content
For problem above, the utility model proposes a kind of earth leakage protective for being provided simultaneously with self-checking function and detection of electrical leakage
Device, and then lift Product Safety.
The utility model proposes a kind of earth leakage protective device, and it includes：Switch module, it is coupled in input and output
Between end, the switch module is electrically connected between the input and the output end for controlling；Leakage current test mould
Block, it includes switch driving member, and the leakage current test module according to work period of the switch driving member and
Whether leakage current signal is detected to control the switch module；And first selftest module, it is coupled to the leakage current inspection
Survey module and periodically produce the self-test pulse signal for simulating the leakage current signal, wherein, first self-test
Module includes：The cycle timing circuit and self-test pulse signal circuit being mutually coupled, the cycle timing circuit are used to control institute
State and be spaced caused by self-test pulse signal.
In one embodiment, the self-test pulse signal circuit includes switching tube, and the cycle timing circuit is coupled to
The switching tube simultaneously controls whether the switching tube turns on, so as to be turned on by the switching tube to produce the self-test arteries and veins
Rush signal, and the timing element in the cycle timing circuit is discharged or passed through institute by the leakage current test module
Leakage current test module is stated to be discharged via the first discharge paths.
In one embodiment, first selftest module and the switch driving member are operated in the two of alternating current respectively
In individual half cycle.
In one embodiment, the self-test pulse signal circuit also includes the shunting base being connected in series with the switching tube
Quasi- source, the cycle timing circuit be coupled to the shunt reference source with control the switching tube whether conducting.
In one embodiment, first selftest module includes power module, and the power module is used for for described in certainly
Examine pulse signal circuit and/or cycle timing circuit power supply.
In one embodiment, when the power module is only the self-test pulse signal circuit power supply, the cycle
Timing circuit is coupled directly to detection of electrical leakage ring with power taking.
In one embodiment, first selftest module and the switch driving member are operated in the same half of alternating current
Zhou Zhong, and the timing element in the cycle timing circuit is discharged by first discharge paths.
In one embodiment, first discharge paths are led prior to the discharge paths in the leakage current test module
It is logical.
In one embodiment, the self-test pulse signal circuit also includes operational amplifier, the operational amplifier
Output end is coupled to the switching tube, and in-phase end is coupled to biasing circuit, and end of oppisite phase is coupled to the cycle timing circuit.
In one embodiment, the self-test pulse signal circuit also includes the light-emitting component connected with the switching tube.
In one embodiment, earth leakage protective device also includes the second self-checking circuit, and second self-checking circuit includes electricity
Resistance, SR and the electric wire through detection of electrical leakage ring, when the SR is pressed, simulation is produced on the electric wire
Leakage current signal.
In one embodiment, the cycle timing circuit is coupled to the switching tube via voltage stabilizing element, so as to extend
The generation interval of the self-test pulse signal.
In one embodiment, earth leakage protective device also includes the voltage stabilizing element in parallel with the timing element.
In one embodiment, first discharge paths are coupled to the detection of electrical leakage chip in leakage current test module
Output end
The utility model can not only be carried out by adding self-checking circuit 1,2 in earth leakage protective device before use
Test device whether failure, additionally it is possible to during earth leakage protective device works, periodically automatic detection earth leakage protective work(
Can, and it is supplied to user to indicate accordingly, greatly improve the security of circuit.
Brief description of the drawings
Refer to the attached drawing shows and illustrates embodiment.These accompanying drawings be used for illustrate general principle, so as to illustrate only for
Understand the necessary aspect of general principle.These accompanying drawings are not in proportion.In the accompanying drawings, identical reference represents similar
Feature.
Fig. 1 shows the configuration diagram of the earth leakage protective device according to the utility model first embodiment；
Fig. 2 shows the principle schematic of the earth leakage protective device according to the utility model second embodiment；
Fig. 3 shows the principle schematic of the earth leakage protective device according to the utility model 3rd embodiment；
Fig. 4 shows the principle schematic of the earth leakage protective device according to the utility model fourth embodiment；
Fig. 5 shows the principle schematic of the earth leakage protective device according to the embodiment of the utility model the 5th；
Fig. 6 shows the principle schematic of the earth leakage protective device according to the utility model sixth embodiment；
Fig. 7 shows the principle schematic of the earth leakage protective device according to the embodiment of the utility model the 7th；
Fig. 8 shows the illustraton of model and equivalent circuit diagram of shunt reference source.
Embodiment
In the specific descriptions of following preferred embodiment, by with reference to forming the appended attached of the utility model part
Figure.Appended accompanying drawing, which has been illustrated by way of example, can realize specific embodiment of the present utility model.The implementation of example
Example is not intended as limit according to all embodiments of the present utility model.It is appreciated that without departing from the scope of the utility model
Under the premise of, other embodiment can be utilized, structural or logicality modification can also be carried out.Therefore, it is following specific to retouch
State and nonrestrictive, and the scope of the utility model is defined by the claims appended hereto.
The utility model is directed to a kind of earth leakage protective device, and the device can be realized detects the leakage of itself before use
Whether electric protection function is normal, can carry out self-test in use.Based on the design, earth leakage protective dress of the present utility model
Put including detection of electrical leakage module, switch module and selftest module.Before use, user can generate mould by selftest module
The leakage current of plan, and then whether observe detection of electrical leakage module working properly；In use, the selftest module can also the cycle
Property pulse leakage stream signal is produced to detect detection of electrical leakage module.
Fig. 1 shows the configuration diagram of the earth leakage protective device according to the utility model first embodiment.Such as Fig. 1 institutes
Show, earth leakage protective device includes input INPUT, output end OUTPUT and for control signal INPUT, output end
The switch SW1 of electrically connected break-make between OUTPUT.Supply lines passes through detection of electrical leakage ring ZCT1.When live wire (L) and zero line (N) electricity
During mobile equilibrium, detection of electrical leakage ring ZCT1 will not produce current imbalance.When the supply lines through detection of electrical leakage ring ZCT1 has electricity
When flowing uneven, that is, when leakage current signal be present, corresponding voltage signal will be produced on detection of electrical leakage ring ZCT1.BD points of rectifier bridge
Be not coupled to supply lines and detection of electrical leakage chip U1, on supply lines power taking with to detection of electrical leakage chip U1 power.Electric leakage
Detection chip U1 is coupled to detection of electrical leakage ring ZCT1, and corresponding voltage change whether is produced on detection of electrical leakage ring ZCT1 for detecting
Change, and then drive controllable silicon Q1 conductings.When Q1 is turned on, will be produced on the coil of switch driving member (for example, solenoid SOL)
Larger curent change, and then disconnect switch SW1.
Based on the purpose of this utility model, the selftest module in earth leakage protective device 100 includes being used to provide to the work(that leaks electricity
The self-checking circuit 1 of experiment before the use of energy and the self-checking circuit 2 for producing periodically simulation leakage current signal.Separately below to certainly
Inspection circuit 1,2 is illustrated.
Self-checking circuit 1 includes resistance R6, SR RESET and the electric wire S3-S4 through detection of electrical leakage ring ZCT, from
Circuit 1 is examined to be used to provide to the experiment before the use of leakage function.After input INPUT is connected with power supply, if pressing reset
Button RESET, switch SW2 will be closed, formed between live wire (L lines) and zero line (N lines) by resistance R6, SR RESET
Current loop, the curent change that detection of electrical leakage ring ZCT1 will be detected on circuit S4, and then produce corresponding induced voltage.Work as leakage
When electro-detection chip U1 detects induced voltage caused by detection ring ZCT and confirms as reaching estimated definite value leakage current signal,
It turns on driving controllable silicon Q1, and then so that curent change is produced on solenoid SOL coil, to produce magnetic field so that open
Close RESET to disconnect, self-checking circuit 1 disconnects, and earth leakage protective device resets, switch SW1 closures, shape between input and output end
Into electrically connected.
Self-checking circuit 2 is used to periodically check earth leakage detection functions.Self-checking circuit 2 includes power circuit, week
Phase timing circuit and simulation electric leakage self-test pulse signal circuit.Referring to Fig. 1, power circuit includes resistance R5, resistance R8, voltage stabilizing
Pipe ZD1 and electric capacity C3；Cycle timing circuit includes the resistance R7 and timing element (for example, electric capacity C4) being connected in series；Self-test
Pulse signal circuit includes triode Q2, adjustable shunt reference source U2, diode D2 and the hair for being respectively coupled to triode Q2
Resistance R9, R10, R13 of emitter-base bandgap grading, base stage and colelctor electrode.After earth leakage protective device reset, self-checking circuit 2 is to detecting the ring cycle
Property apply and reach estimated definite value simulation leakage current signal.Testing button TEST is configured as product in reset state and defeated
Enter end not access under power conditions, press TEST buttons, so that it may disconnect the connection between input and output end.
Specifically, resistance R8 one end is coupled between resistance R5 and voltage-stabiliser tube ZD1, and resistance R8 other end coupling
The node being connected between resistance R9, R10, and it is coupled to ground potential via electric capacity C3.It follows that power circuit is shunting benchmark
Source U2 and triode Q2 provides stable DC supply.In addition, power circuit also provides charging electricity for cycle timing circuit
Source, as electric capacity C4 are charged.By setting resistance R7, electric capacity C4 value can determine interval time from the overhaul period.Self-test arteries and veins
Rush signal circuit be used for generate simulation leakage current signal self-test pulse signal, wherein, resistance R9, R10 offer triode Q2's
Base bias voltage, triode Q2 cause coil cold half cycle of the self-test pulse in solenoid SOL to produce.Resistance R9 is used
Shunt reference source U2 size of current is flowed through in limitation.Shunt reference source U2 is in the timing determined by resistance R7, electric capacity C4
Between then, just allow triode Q2 to turn on, produce leakage current pulse signal.
Fig. 8 shows the illustraton of model and equivalent circuit diagram of shunt reference source.As shown in figure 8, shunt reference source U2 is three ends
Adjustable shunt reference source, it includes negative electrode (K), anode (A) and reference edge (REF), and shunt reference source U2 can be equivalent to
Operational amplifier (abbreviation amplifier), 2.5V a reference sources, triode.The inverting input coupling 2.5V of amplifier a reference source, same to phase
Input couples reference edge, and triode is connected on the output end of amplifier.Understood based on the equivalent circuit diagram, when the in-phase end of amplifier
During the very close reference voltage 2.5V of the voltage at (i.e. REF ends), by changing the minor variations of REF terminal voltages, three can be controlled
The electric current of pole pipe can change in 1mA between 100mA.When the voltage of in-phase end is less than 2.5V, triode is in cut-off shape
State.Therefore, the utility model carrys out the execution cycle by using the amplifier inside shunt reference source U2 and the working characteristics of triode
Timing timed switching function.It should be understood that in order to strengthen the stability of circuit, shunt reference source U2 has good thermostabilization
Performance, shunt reference source U2 can also be replaced with other controllable switch elements or similar component.
For the ease of illustrating, here so that electric-leakage detection circuit is operated in positive half cycle, self-checking circuit 2 is operated in negative half period as an example
It is illustrated.It should be understood that positive-negative half-cycle herein is only used for illustrating, rather than work is only capable of for limiting those circuits
Make in the illustrated period.
The specific work process of self-checking circuit 2 is as follows：
After product resets, the voltage on electric capacity C4 is zero, therefore shunt reference source U2 REF ends are less than reference voltage 2.5V,
Then the triode in shunt reference source U2 is off, and shunt reference source U2 can not be turned on.In negative half period, although three
Positive bias-voltage be present in pole pipe Q2 base stage, but because triode Q2 emitter stages are to be coupled to ground via shunt reference source U2, therefore,
When shunt reference source U2 is not turned on, triode Q2 is also not turned on, so as to produce leakage current signal.Power circuit leads to
Resistance R7 is crossed to charge to electric capacity C4, when the voltage on electric capacity C4 fills up to more than 2.5V, the triode ON in a reference source U2,
And then cause base stage to have the triode Q2 conductings of positive bias-voltage, produce leakage current pulse signal, detection of electrical leakage core on detection ring ZCT1
After piece U1 detects the leakage current pulse signal, by driving controllable silicon Q1 conductings.Due to solenoid SOL in power supply positive half cycle coil
It could go and be powered into current loop, therefore switch SW1 to thread off, now electric capacity C4 is quick by diode D2, controllable silicon Q1
Electric discharge.With the progress of electric discharge, the voltage on electric capacity C4 is less than 2.5V, then triode turns off in U2, and then triode Q2 is closed
It is disconnected, one is completed from the overhaul period, and next self-test pulse during electric capacity C4 chargometers to starting.
Working method when earth leakage protective device breaks down：
Creepage protection function failure includes but is not limited to following situations：Electronic component in electric-leakage detection circuit is (for example, inspection
Survey ring ZCT1, resistance R3, R14 etc.) occur opening a way or short circuit, or detection of electrical leakage chip U1 damages.When the above situation occurs,
Detection of electrical leakage chip U1 will be unable to so that controllable silicon Q1 is turned on, and in other words, solenoid SOL will be unable to normal controlling switch SW1.
When self-checking circuit 2 generates self-test pulse signal, because detection of electrical leakage chip U1 can not turn on controllable silicon Q1,
Therefore the voltage on electric capacity C4 can not discharge via controllable silicon Q1.Because the voltage on electric capacity C4 maintains high potential, then base is shunted
Quasi- source U2 is constantly on so that the Chang Liang of LED 2, thus informs that user's earth leakage protective device has failure.Can be with
Understand, in this embodiment, if electric-leakage detection circuit is working properly, LED 2 can flash.When user obtains
When knowing that electric-leakage detection circuit is faulty, test button TEST can be pressed, input and output contact is disconnected by mechanical part, resetted
Block piece under button RESET restores, when pressing SR RESET again, the output simulation leakage current signal of self-checking circuit 1,
Because earth leakage detection functions fail, the coil method row on solenoid SOL is into current loop, the block piece under SR RESET
It can not move, prevent SR RESET from continuing traveling downwardly, can not be resetted so as to which input and output contact can not connect so that be used
Family can not use, and then the purpose of safety.
When solenoid SOL or controllable silicon Q1 open a way, SR because block piece can not reset earth leakage protective device,
Output is without electricity.When there is such failure when earth leakage protective device is in reset state, TEST buttons are pressed, input and output is disconnected and connects
Connect, again by can not then be resetted during SR.
When controllable silicon Q1 short circuits, larger electric current always will be present on solenoid SOL, now press SR
RESET, earth leakage protective device will thread off repeatedly, input and output can not be kept to connect.
In summary, product creepage protection function is when the utility model completes detection reset manually by self-checking circuit 1
No failure；Realized in normal operation by self-checking circuit 2, periodically just whether automatic detection creepage protection function
Often, when earth leakage protective device breaks down, failure red light LED2 is lighted, and by pressing TEST buttons, disconnects output power supply.
Fig. 2 shows the principle schematic of the earth leakage protective device according to the utility model second embodiment.
Compared to Fig. 1, the self-checking circuit 2 in Fig. 2 adds voltage-stabiliser tube ZD2 at shunt reference source U2 REF ends.Therefore,
To cause shunt reference source U2 to turn on, the voltage needs on electric capacity C4 are higher, i.e., in order to cause triode ON in U2, shunt
The voltage stabilizing value that the voltage at a reference source U2 REF ends is at least ZD2 adds 2.5V.Clearly as the voltage of charging needed for electric capacity C4
Higher, self-test period interval time will increase, and so as to reduce the current flowing time of self-test signal generation circuit, that is, reduce
The power consumption consumed on resistance R9, R10 and R13 of self-checking circuit.In this embodiment, LED 2 is connected serially to three
Pole pipe Q2 emitter stage.When electric capacity C4 can not by controllable silicon Q1 to discharge when, LED 2 will keep Chang Liang.
Fig. 3 shows the principle schematic of the earth leakage protective device according to the utility model 3rd embodiment.
As shown in figure 3, being different from Fig. 1, in self-checking circuit 2, resistance R5, voltage-stabiliser tube ZD1, electric capacity C3 are shunt reference source
U2 and triode Q2 provides stable DC supply.Cycle timing circuit in this embodiment is modified to：Electric capacity C4 is passed through
Winding S1-S2 is directly coupled to by resistance R7, i.e. electric capacity C4 is from the direct power taking of negative half period of AC power, self-test period distances
Time is by R7, C4 parameter setting.In addition, voltage-stabiliser tube ZD2 is connected in parallel with electric capacity C4, for protecting electric capacity C4 and shunting benchmark
Source U2 REF ends are not broken down by high-voltage.
Fig. 4 shows the principle schematic of the earth leakage protective device according to the utility model fourth embodiment.
As shown in figure 4, being different from Fig. 1, in self-checking circuit 2, power circuit includes resistance R5, voltage-stabiliser tube ZD1, electric capacity
C3, for providing stable DC supply for shunt reference source U2 and triode Q2.Cycle timing circuit includes resistance R8
With electric capacity C4, and resistance R8 connects with resistance R7, and voltage-stabiliser tube ZD2 is connected in parallel on the node and ground electricity between resistance R7, R8
Between position, so as to which shunt reference source U2 REF terminal voltages are limited to less than the voltage stabilizing value equal to voltage-stabiliser tube ZD2.Even if voltage stabilizing
Pipe ZD2 is damaged, and the electric current on the branch road can also be limited by setting resistance R7 and/or R8 value, therefore, resistance
R7 and voltage-stabiliser tube ZD2 provide safe voltage power supply for cycle timing circuit, equally, by setting resistance R8, electric capacity C4 value can
To set self-test period interval time.
Fig. 5 shows the principle schematic of the earth leakage protective device according to the embodiment of the utility model the 5th.
As shown in figure 5, being different from Fig. 4, increase resistance R11, resistance R12, controllable silicon Q3 are also add in self-checking circuit 2
And electric capacity C5, wherein individual, controllable silicon Q3 is connected in parallel with electric capacity C4, and thus, when controllable silicon Q3 is turned on, electric capacity C4 can lead to
Controllable silicon Q3 is crossed to be discharged.Specifically, when cycle self-test pulse exports, detection of electrical leakage chip U1 output driving controllable silicons
Signal, drive controllable silicon Q3 to turn on by resistance R12, electric capacity C5, and then cause electric capacity C4 electric discharges, start next self-test week
Phase.While controllable silicon Q3 is driven, detection of electrical leakage drive signal also by resistance R11, electric capacity C1 controllable silicon Q1 control
Pole, which applies, can open controllable silicon Q1 voltage, but because self-test pulses generation in solenoid SOL does not form current loop
Negative half period, therefore, switch SW1 still close.
Fig. 6 shows the principle schematic of the earth leakage protective device according to the utility model sixth embodiment.
As shown in fig. 6, being different from Fig. 1, shunt reference source U2 is replaced using amplifier U3 to control self-test pulse to export.Certainly
Examine in circuit 2, power circuit includes electric capacity R5, voltage-stabiliser tube ZD1 and electric capacity C3, for providing stable DC electricity to amplifier U3
Source.The resistance R7, the resistance R8 that are connected in series are coupled to amplifier U3 inverting input.Cycle timing circuit includes being used for setting
Resistance R9, electric capacity C4 from the overhaul period, and electric capacity C4 is couple to the in-phase input end of amplifier.When on the voltage on electric capacity C4
Rise to when being more than end of oppisite phase reference voltage, amplifier output state will be overturn, and thus be driven triode Q2 conductings, be produced self-test mould
Intend leakage current signal.When detection of electrical leakage chip U1 detects the leakage current signal via detection coil ZCT1, controllable silicon will be driven
Q1 is turned on, and then electric capacity C4 can be discharged by diode D2, controllable silicon Q1, start next cycle charging process.
Fig. 7 shows the principle schematic of the earth leakage protective device according to the embodiment of the utility model the 7th.
As shown in fig. 7, being different from Fig. 5, detection of electrical leakage chip U1 uses alternating current input power supplying, correspondingly by self-test electricity
Positive half cycle or negative half period power taking of the road 2 by diode D1 from AC power.In other words, self-checking circuit 2 and solenoid SOL works
Make in the same half cycle of alternating current.By setting the parameter for the RC circuits for being coupled to controllable silicon Q1, Q3 control pole, that is, set
R11, C11 and R12, C5 parameter so that controllable silicon Q3 turns on prior to controllable silicon Q1, in this way, the line on solenoid SOL
Circle discharges electric capacity C4 before not going into current loop also, closes self-test leakage current pulse, avoids product false tripping.
The utility model can not only be carried out by adding self-checking circuit 1,2 in earth leakage protective device before use
Test device whether failure, additionally it is possible to during earth leakage protective device works, periodically automatic detection earth leakage protective work(
Can, and it is supplied to user to indicate accordingly, greatly improve the security of circuit.
Therefore, although describing the utility model with reference to specific example, wherein these specific examples are merely intended to
It is exemplary, rather than the utility model is limited, but it is obvious to those skilled in the art
It is that on the basis of spirit and scope of the present utility model is not departed from, the disclosed embodiments can be changed, increased
Add or delete.
Claims (14)
- A kind of 1. earth leakage protective device, it is characterised in that including：Switch module, it is coupled between input and output end, and the switch module is used to control the input and described It is electrically connected between output end；Leakage current test module, it includes switch driving member, and the leakage current test module is according to the switch drive The work period of part and leakage current signal whether is detected to control the switch module；AndFirst selftest module, it is coupled to the leakage current test module and periodically produced for simulating the leakage current The self-test pulse signal of signal, wherein, first selftest module includes：The cycle timing circuit being mutually coupled and self-test pulse Signal circuit, the cycle timing circuit, which is used to control caused by the self-test pulse signal, to be spaced.
- 2. earth leakage protective device as claimed in claim 1, it is characterised in that the self-test pulse signal circuit includes switch Pipe, the cycle timing circuit are coupled to the switching tube and control whether the switching tube turns on, so as to by described Switching tube is turned on to produce the self-test pulse signal, and the timing element in the cycle timing circuit passes through the electric leakage Stream detection module is discharged or discharged by the leakage current test module via the first discharge paths.
- 3. earth leakage protective device as claimed in claim 2, it is characterised in that first selftest module and the switch drive Part is operated in the different half cycles of alternating current respectively.
- 4. earth leakage protective device as claimed in claim 3, it is characterised in that the self-test pulse signal circuit also includes and institute The shunt reference source that switching tube is connected in series is stated, the cycle timing circuit is coupled to the shunt reference source to control described open Close pipe whether conducting.
- 5. earth leakage protective device as claimed in claim 4, it is characterised in that first selftest module includes power module, The power module is used to power for the self-test pulse signal circuit and/or the cycle timing circuit.
- 6. earth leakage protective device as claimed in claim 5, it is characterised in that when the power module is only the self-test pulse When signal circuit is powered, the cycle timing circuit is coupled directly to detection of electrical leakage ring with power taking.
- 7. earth leakage protective device as claimed in claim 2, it is characterised in that first selftest module and the switch drive Component working is in the same half cycle of alternating current, and the timing element in the cycle timing circuit discharges by described first Branch road is discharged.
- 8. earth leakage protective device as claimed in claim 7, it is characterised in that first discharge paths are prior to the leakage current Discharge paths in detection module and turn on.
- 9. earth leakage protective device as claimed in claim 3, it is characterised in that the self-test pulse signal circuit also includes computing Amplifier, the output end of the operational amplifier are coupled to the switching tube, and in-phase end is coupled to biasing circuit, end of oppisite phase coupling To the cycle timing circuit.
- 10. earth leakage protective device as claimed in claim 2, it is characterised in that the self-test pulse signal circuit also include with The light-emitting component of the switching tube series connection.
- 11. earth leakage protective device as claimed in claim 1, it is characterised in that also including the second selftest module, described second certainly Inspection module includes resistance, SR and the electric wire through detection of electrical leakage ring, when the SR is pressed, the electricity The leakage current signal of simulation is produced on line.
- 12. earth leakage protective device as claimed in claim 2, it is characterised in that the cycle timing circuit is via voltage stabilizing element The switching tube is coupled to, so as to extend the generation interval of the self-test pulse signal.
- 13. earth leakage protective device as claimed in claim 2, it is characterised in that also include in parallel with the timing element steady Press element.
- 14. earth leakage protective device as claimed in claim 7, it is characterised in that first discharge paths are coupled to leakage current The output end of detection of electrical leakage chip in detection module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720344493.XU CN206697913U (en) | 2017-04-01 | 2017-04-01 | Earth leakage protective device |
| US15/586,952 US9871366B1 (en) | 2016-07-13 | 2017-05-04 | Leakage current detection and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720344493.XU CN206697913U (en) | 2017-04-01 | 2017-04-01 | Earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206697913U true CN206697913U (en) | 2017-12-01 |
Family
ID=60441448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720344493.XU Active CN206697913U (en) | 2016-07-13 | 2017-04-01 | Earth leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206697913U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666972A (en) * | 2017-04-01 | 2018-10-16 | 苏州益而益电器制造有限公司 | Earth leakage protective device |
| CN109061360A (en) * | 2018-06-21 | 2018-12-21 | 浙江巨磁智能技术有限公司 | The safe self-checking system of earth leakage protective and its self checking method |
-
2017
- 2017-04-01 CN CN201720344493.XU patent/CN206697913U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666972A (en) * | 2017-04-01 | 2018-10-16 | 苏州益而益电器制造有限公司 | Earth leakage protective device |
| CN108666972B (en) * | 2017-04-01 | 2024-04-19 | 苏州益而益电器制造有限公司 | Leakage protector |
| CN109061360A (en) * | 2018-06-21 | 2018-12-21 | 浙江巨磁智能技术有限公司 | The safe self-checking system of earth leakage protective and its self checking method |
| CN109061360B (en) * | 2018-06-21 | 2020-12-15 | 浙江巨磁智能技术有限公司 | Leakage protection safety self-checking system and self-checking method thereof |
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