CN108666972A - Earth leakage protective device - Google Patents
Earth leakage protective device Download PDFInfo
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- CN108666972A CN108666972A CN201710212497.7A CN201710212497A CN108666972A CN 108666972 A CN108666972 A CN 108666972A CN 201710212497 A CN201710212497 A CN 201710212497A CN 108666972 A CN108666972 A CN 108666972A
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- protective device
- earth leakage
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- 230000001681 protective effect Effects 0.000 title claims abstract description 58
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims description 45
- 230000005611 electricity Effects 0.000 claims description 14
- 238000004088 simulation Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 24
- 229910052710 silicon Inorganic materials 0.000 description 24
- 239000010703 silicon Substances 0.000 description 24
- 230000006870 function Effects 0.000 description 14
- 239000003381 stabilizer Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of earth leakage protective devices comprising：Switch module is coupled between input terminal and output end, and switch module is for electrically connected between control signal and output end；Leakage current test module comprising switch driving member, and whether leakage current test module according to the work period of switch driving member and detects leakage current signal and controls switch module；And first selftest module, it is coupled to leakage current test module and periodically generates the self-test pulse signal for simulating leakage current signal, wherein the first selftest module includes：The period timing circuit and self-test pulse signal circuit being mutually coupled, period timing circuit are used to control the interval of self-test pulse signal generation.By implementing technical scheme of the present invention, the safety of circuit can be greatly promoted.
Description
Technical field
The invention belongs to electric field more particularly to a kind of earth leakage protective devices having self-checking function.
Background technology
Currently, more and more families or industrial electric apparatus are used in every field.For Electrical Safety, though people
Earth leakage protective device so is installed in power grid output end or in the input terminal of some household electrical appliance, and is indicated in awake destination locations
Whether " being tested before use " be normal to supervise the function that user tests earth leakage protective device.But in use, because what is used
The factors such as environment difference or installation, even if people have carried out earth leakage protective device the operation using preceding experiment, earth leakage protective device is still
It so deposits and loses earth leakage protective possibility in use, occur so as to cause dangerous situation.For example, the electric heating in water tank
Pipe because it is long-term it is under water cause to get rusty or insulating layer damage, then the electric leakage generated will with dampening conduction, if this
When someone taking a shower, people will get an electric shock, and lead to personal injury.
Therefore, there is an urgent need for a kind of earth leakage protective devices having self-checking function.
Invention content
In view of the above problems, the present invention proposes a kind of earth leakage protective device being provided simultaneously with self-checking function and detection of electrical leakage,
And then promote Product Safety.
The present invention proposes a kind of earth leakage protective device comprising：Switch module, be coupled in input terminal and output end it
Between, the switch module is electrically connected between the input terminal and the output end for controlling；Leakage current test module,
Including switch driving member, and whether the leakage current test module according to work period of the switch driving member and is examined
Leakage current signal is measured to control the switch module；And first selftest module, it is coupled to the leakage current test module
And periodically generate the self-test pulse signal for simulating the leakage current signal, wherein the first selftest module packet
It includes：The period timing circuit and self-test pulse signal circuit being mutually coupled, the period timing circuit is for controlling the self-test
The interval that pulse signal generates.
In one embodiment, the self-test pulse signal circuit includes switching tube, and the period timing circuit is coupled to
The switching tube simultaneously controls whether the switching tube is connected, to generate the self-test arteries and veins by making the switching tube conducting
Rush signal, and the timing element in the period timing circuit is discharged by the leakage current test module or passed through institute
Leakage current test module is stated to discharge 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 a half cycle.
In one embodiment, the self-test pulse signal circuit further includes the shunting base being connected in series with the switching tube
Quasi- source, the period 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 period timing circuit power supply.
In one embodiment, when the power module is only the self-test pulse signal circuit power supply, the period
Timing circuit is coupled directly to detection of electrical leakage ring to take electricity.
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 period timing circuit is discharged by first discharge paths.
In one embodiment, first discharge paths are connected prior to the discharge paths in the leakage indicator.
In one embodiment, the self-test pulse signal circuit further includes operational amplifier, the operational amplifier
Output end is coupled to the switching tube, and in-phase end is coupled to biasing circuit, and reverse side is coupled to the period timing circuit.
In one embodiment, the self-test pulse signal circuit further includes and the concatenated light-emitting component of the switching tube.
In one embodiment, earth leakage protective device further includes the second self-checking circuit, and second self-checking circuit includes electricity
Resistance, reset button and the electric wire across detection of electrical leakage ring generate simulation when the reset button is pressed on the electric wire
Leakage current signal.
In one embodiment, the period timing circuit is coupled to the switching tube via voltage stabilizing element, to extend
The generation interval of the self-test pulse signal.
In one embodiment, earth leakage protective device further includes the voltage stabilizing element in parallel with the timing element.
In one embodiment, first discharge paths are coupled to leakage current test mould detection of electrical leakage chip in the block
Output end
The present invention can not only be tested by adding self-checking circuit 1,2 in earth leakage protective device before use
Device whether failure, additionally it is possible to during earth leakage protective device works, periodically automatically detection creepage protection function, and
It is supplied to user to indicate accordingly, greatly improves the safety of circuit.
Description of the drawings
Refer to the attached drawing shows and illustrates embodiment.These attached drawings for illustrating basic principle, to illustrate only for
Understand the necessary aspect of basic principle.These attached drawings are not in proportion.In the accompanying drawings, identical reference numeral indicates similar
Feature.
Fig. 1 shows the configuration diagram of earth leakage protective device according to a first embodiment of the present invention；
Fig. 2 shows the principle schematics of earth leakage protective device according to a second embodiment of the present invention；
Fig. 3 shows the principle schematic of earth leakage protective device according to a third embodiment of the present invention；
Fig. 4 shows the principle schematic of earth leakage protective device according to a fourth embodiment of the present invention；
Fig. 5 shows the principle schematic of earth leakage protective device according to a fifth embodiment of the present invention；
Fig. 6 shows the principle schematic of earth leakage protective device according to a sixth embodiment of the present invention；
Fig. 7 shows the principle schematic of earth leakage protective device according to a seventh embodiment of the present invention；
Fig. 8 shows the illustraton of model and equivalent circuit diagram of shunt reference source.
Specific implementation mode
It, will be with reference to the appended attached drawing for constituting a present invention part in the specific descriptions of following preferred embodiment.Institute
Attached attached drawing, which has been illustrated by way of example, can realize specific embodiment.Exemplary embodiment is not intended to
Limit all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, other can be utilized
Embodiment can also carry out structural or logicality modification.Therefore, it is below specific descriptions and it is unrestricted, and this
The range of invention is defined by the claims appended hereto.
The present invention is directed to propose a kind of earth leakage protective device, which can realize is protected using the preceding detection electric leakage of itself
Whether protective function is normal, can carry out self-test in use.Based on the design, earth leakage protective device of the invention includes leakage
Electro-detection module, switch module and selftest module.Before use, user can generate the electric leakage of simulation by selftest module
Stream, and then whether observe detection of electrical leakage module working properly；In use, which can also periodically generate
Pulse leakage stream signal is detected detection of electrical leakage module.
Fig. 1 shows the configuration diagram of earth leakage protective device according to a first embodiment of the present invention.As shown in Figure 1, leakage
Electrical protective device include input terminal INPUT, output end OUTPUT and for control signal INPUT, output end OUTPUT it
Between electrically connected break-make switch SW1.Supply lines passes through detection of electrical leakage ring ZCT1.When firewire (L) and zero curve (N) current balance type
When, detection of electrical leakage ring ZCT1 not will produce current imbalance.When there are electric current injustice for the supply lines across detection of electrical leakage ring ZCT1
When weighing apparatus, that is, when there is leakage current signal, corresponding voltage signal will be generated on detection of electrical leakage ring ZCT1.Rectifier bridge BD is respectively coupled to
To supply lines and detection of electrical leakage chip U1, for taking electricity on supply lines to power to detection of electrical leakage chip U1.Detection of electrical leakage core
Piece U1 is coupled to detection of electrical leakage ring ZCT1, whether generates corresponding voltage change on detection of electrical leakage ring ZCT1 for detecting, in turn
Silicon-controlled Q1 is driven to be connected.When Q1 is connected, will be generated on the coil of switch driving member (for example, solenoid SOL) larger
Curent change, and then disconnect switch SW1.
Based on the purpose of the present invention, the selftest module in earth leakage protective device 100 includes for providing to leakage function
The self-checking circuit 1 of experiment before use and the self-checking circuit 2 for generating periodically simulation leakage current signal.Separately below to self-test electricity
Road 1,2 is illustrated.
Self-checking circuit 1 includes resistance R6, reset button RESET and the electric wire S3-S4 across detection of electrical leakage ring ZCT, from
Inspection circuit 1 is used to provide the experiment before the use to leakage function.After input terminal INPUT is connect with power supply, if pressing reset
Button RESET, switch SW2 will be closed, and be formed by resistance R6, reset button RESET between firewire (L lines) and zero curve (N lines)
Current loop, detection of electrical leakage ring ZCT1 will detect the curent change on circuit S4, and then generate corresponding induced voltage.Work as leakage
When electro-detection chip U1 detects induced voltage caused by detection ring ZCT and is confirmed as reaching estimated definite value leakage current signal,
It will drive silicon-controlled Q1 to be connected, so that curent change is generated on the coil of solenoid SOL, to generate magnetic field so that open
It closes RESET to disconnect, self-checking circuit 1 disconnects, and earth leakage protective device resets, and switch SW1 is closed, and is formed between input terminal and output end
It is electrically connected.
Self-checking circuit 2 is for periodically checking 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 capacitance C3；Period timing circuit includes the resistance R7 being connected in series with and timing element (for example, capacitance C4)；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 collector.After earth leakage protective device reset, self-checking circuit 2 is to detecting the ring period
Property apply and reach estimated definite value simulation leakage current signal.Testing button TEST is configured as when product is in reset state and input
End is not accessed under power conditions, presses TEST buttons, so that it may disconnect the connection between input terminal and output end.
Specifically, one end of resistance R8 is coupled between resistance R5 and voltage-stabiliser tube ZD1, and the other end coupling of resistance R8
The node being connected between resistance R9, R10, and it is coupled to ground potential via capacitance C3.It follows that power circuit is shunting benchmark
Source U2 and triode Q2 provide stable DC supply.In addition, power circuit also provides charging electricity for period timing circuit
Source, as capacitance C4 are charged.Value by setting resistance R7, capacitance C4 can determine the interval time from the overhaul period.Self-test arteries and veins
Rush self-test pulse signal of the signal circuit for generating simulation leakage current signal, wherein resistance R9, R10 provide triode Q2's
Base bias voltage, triode Q2 make self-test pulse be generated in the cold half cycle of the coil of solenoid SOL.Resistance R9 is used for
The size of current of shunt reference source U2 is flowed through in limitation.Shunt reference source U2 is in the timing time determined by resistance R7, capacitance C4
Then, just triode Q2 is allowed to be connected, generates 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 comprising cathode (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 a reference source of the inverting input coupling 2.5V of amplifier, same to phase
Input terminal couples reference edge, and triode is connected on the output end of amplifier.Based on the equivalent circuit diagram it is found that working as the in-phase end of amplifier
When the voltage at (i.e. the ends REF) is very close to reference voltage 2.5V, by changing the minor change 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 present invention carrys out execution cycle timing by using the working characteristics of amplifier and triode inside shunt reference source U2
Timed switching function.It should be understood that in order to enhance the stability of circuit, shunt reference source U2 has good thermal stability
Can, shunt reference source U2 can also be replaced with other controllable switch elements or similar component.
For the ease of illustrating, here by taking 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 the period illustrated by.
The specific work process of self-checking circuit 2 is as follows：
After product resets, the voltage on capacitance C4 is zero, therefore the ends REF of shunt reference source U2 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 connected.In negative half period, although three poles
There are positive bias-voltages for the base stage of pipe Q2, but since triode Q2 emitters are to be coupled to ground via shunt reference source U2, when
When shunt reference source U2 is not turned on, triode Q2 is also not turned on, to generate leakage current signal.Power circuit passes through electricity
R7 is hindered to charge to capacitance C4, when the voltage on capacitance C4 fills up to 2.5V or more, the triode ON in a reference source U2, in turn
So that base stage there are the triode Q2 conductings of positive bias-voltage, leakage current pulse signal, detection of electrical leakage chip U1 are generated on detection ring ZCT1
After detecting the leakage current pulse signal, silicon-controlled Q1 will be driven to be connected.Due to solenoid SOL in power supply positive half cycle coil ability
Row is powered at current loop, therefore switch SW1 will not thread off, and capacitance C4 passes through diode D2, silicon-controlled Q1 repid discharges at this time.
With the progress of electric discharge, the voltage on capacitance C4 is less than 2.5V, then triode turns off in U2, and then triode Q2 shutdowns, completes
One from the overhaul period, next self-test pulse when capacitance C4 chargometers to starting.
Working method when earth leakage protective device breaks down：
Creepage protection function failure includes but 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 the U1 damages of detection of electrical leakage chip.When the above situation occurs,
Detection of electrical leakage chip U1 will be unable to so that silicon-controlled Q1 is connected, and in other words, solenoid SOL will be unable to normal control switch SW1.
When self-checking circuit 2 produces self-test pulse signal, since detection of electrical leakage chip U1 can not be such that silicon-controlled Q1 is connected,
Therefore the voltage on capacitance C4 can not discharge via silicon-controlled Q1.Since the voltage on capacitance C4 maintains high potential, then base is shunted
Quasi- source U2 is constantly on so that Light-emitting diode LED 2 is always on, and thus informs that there are failures for user's earth leakage protective device.It can manage
Solution, in this embodiment, if electric-leakage detection circuit is working properly, Light-emitting diode LED 2 can flicker.When user is known
Electric-leakage detection circuit in the event of failure, can press test button TEST, disconnect input and output contact by mechanical part, reset is pressed
Block piece under button RESET restores, when pressing reset button RESET again, the output simulation leakage current signal of self-checking circuit 1, by
Fail in earth leakage detection functions, the coil method row on solenoid SOL at current loop, block piece under reset button RESET without
Method moves, and reset button RESET is prevented to continue traveling downwardly, and cannot be resetted to which input and output contact can not connect so that user
It can not use, and then achieve the purpose that safe.
When solenoid SOL or silicon-controlled Q1 open a way, reset button since block piece can not be such that earth leakage protective device resets,
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
It connects, again by can not then be resetted when reset button.
When silicon-controlled Q1 short circuits, larger electric current will be always existed on solenoid SOL, press reset button at this time
RESET, earth leakage protective device will thread off repeatedly, cannot keep input and output connection.
In conclusion the present invention completes to detect whether product creepage protection function when resetting loses manually by self-checking circuit 1
Effect；It is realized in normal operation by self-checking circuit 2, periodically whether detection creepage protection function is normal automatically, when
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 schematics of earth leakage protective device according to a second embodiment of the present invention；.
Compared to Fig. 1, the self-checking circuit 2 in Fig. 2 increases voltage-stabiliser tube ZD2 at the ends REF of shunt reference source U2.Therefore,
To make shunt reference source U2 be connected, the voltage on capacitance C4 needs higher, in order to make triode ON in U2, shunting
The voltage stabilizing value that the voltage at the ends REF of a reference source U2 is at least ZD2 adds 2.5V.Clearly as the voltage to charge needed for capacitance C4
Higher, self-test period interval time will increase, 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, Light-emitting diode LED 2 is connected serially to three
The emitter of pole pipe Q2.When capacitance C4 can not be by silicon-controlled Q1 come when discharging, holding is always on by Light-emitting diode LED 2.
Fig. 3 shows the principle schematic of earth leakage protective device according to a third embodiment of the present invention.
As shown in figure 3, being different from Fig. 1, in self-checking circuit 2, resistance R5, voltage-stabiliser tube ZD1, capacitance C3 are shunt reference source
U2 and triode Q2 provide stable DC supply.Period timing circuit in this embodiment is modified to：Capacitance C4 warps
Winding S1-S2 is directly coupled to by resistance R7, i.e. capacitance C4 directly takes electricity from the negative half period of AC power, when self-test period distances
Between by R7, C4 parameter setting.In addition, voltage-stabiliser tube ZD2 is connected in parallel with capacitance C4, for protecting capacitance C4 and shunt reference source U2
The ends REF be not broken down by high-voltage.
Fig. 4 shows the principle schematic of earth leakage protective device according to a fourth embodiment of the present invention.
As shown in figure 4, being different from Fig. 1, in self-checking circuit 2, power circuit includes resistance R5, voltage-stabiliser tube ZD1, capacitance
C3, for providing stable DC supply for shunt reference source U2 and triode Q2.Period timing circuit includes resistance R8
With capacitance C4, and resistance R8 connects with resistance R7, and voltage-stabiliser tube ZD2 is connected in parallel on node and ground electricity between resistance R7, R8
Between position, the voltage stabilizing value equal to voltage-stabiliser tube ZD2 is limited to less than to the REF terminal voltages of shunt reference source U2.Even if voltage stabilizing
Pipe ZD2 damages, can also limit the electric current of the branch road by the way that the value of resistance R7 and/or R8 is arranged, therefore, resistance
R7 and voltage-stabiliser tube ZD2 provides safe voltage power supply for period timing circuit, and equally, the value by the way that resistance R8, capacitance C4 is arranged can
To set self-test period interval time.
Fig. 5 shows the principle schematic of earth leakage protective device according to a fifth embodiment of the present invention.
As shown in figure 5, being different from Fig. 4, is also added in self-checking circuit 2 and increase resistance R11, resistance R12, silicon-controlled Q3
And capacitance C5, wherein a, silicon-controlled Q3 is connected in parallel with capacitance C4, and as a result, when silicon-controlled Q3 is connected, capacitance C4 can lead to
Silicon-controlled Q3 is crossed to discharge.Specifically, when period self-test pulse exports, detection of electrical leakage chip U1 output drivings are silicon-controlled
Signal drives silicon-controlled Q3 to be connected by resistance R12, capacitance C5, so that capacitance C4 electric discharges, start next self-test week
Phase.While driving silicon-controlled Q3, detection of electrical leakage drive signal also by resistance R11, capacitance C1 silicon-controlled Q1 control
Pole applies the voltage that can open silicon-controlled Q1, but does not form current loop since self-test pulse results from solenoid SOL
Negative half period, therefore, switch SW1 are still closed.
Fig. 6 shows the principle schematic of earth leakage protective device according to a sixth embodiment of the present invention.
As shown in fig. 6, being different from Fig. 1, self-test pulse output is controlled instead of shunt reference source U2 using amplifier U3.Certainly
It examines in circuit 2, power circuit includes capacitance R5, voltage-stabiliser tube ZD1 and capacitance C3, is used for providing stable DC electricity to amplifier U3
Source.The resistance R7, the resistance R8 that are connected in series with are coupled to the inverting input of amplifier U3.Period timing circuit includes being used for setting certainly
Resistance R9, the capacitance C4 of overhaul period, and capacitance C4 is couple to the in-phase input end of amplifier.When the voltage on capacitance C4 rises to
When more than reverse side reference voltage, amplifier output state will be overturn, and thus drive triode Q2 conductings, generate self-test simulation electric leakage
Flow signal.When detection of electrical leakage chip U1 detects the leakage current signal via detection coil ZCT1, silicon-controlled Q1 will be driven to be connected,
And then capacitance C4 can be discharged by diode D2, silicon-controlled Q1, start next period charging process.
Fig. 7 shows the principle schematic of earth leakage protective device according to a seventh embodiment of the present invention.
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
Road 2 takes electricity by diode D1 from the positive half cycle/or negative half period of AC power.In other words, self-checking circuit 2 and solenoid SOL
It is operated in the same half cycle of alternating current.It is coupled to the parameter of the RC circuits of silicon-controlled Q1, Q3 control pole by setting, that is, is arranged
The parameter of R11, C11 and R12, C5 so that silicon-controlled Q3 is connected prior to silicon-controlled Q1, in this way, the coil on solenoid SOL
Also row does not discharge to capacitance C4 at before current loop, closes self-test leakage current pulse, avoids product false tripping.
The present invention can not only be tested by adding self-checking circuit 1,2 in earth leakage protective device before use
Device whether failure, additionally it is possible to during earth leakage protective device works, periodically automatically detection creepage protection function, and
It is supplied to user to indicate accordingly, greatly improves the safety of circuit.
Therefore, although describing the present invention with reference to specific example, wherein these specific examples are merely intended to be to show
Example property, rather than limit the invention, but it will be apparent to those skilled in the art that not taking off
On the basis of spirit and scope from the present invention, the disclosed embodiments can be changed, increased or deleted.
Claims (14)
1. a kind of earth leakage protective device, which is characterized in that including：
Switch module is coupled between input terminal and output end, and the switch module is for controlling the input terminal and described
It is electrically connected between output end；
Leakage current test module comprising switch driving member, and the leakage current test module is according to the switch drive
The work period of component and leakage current signal whether is detected to control the switch module；And
First selftest module is coupled to the leakage current test module and periodically generates for simulating the leakage current
The self-test pulse signal of signal, wherein first selftest module includes：The period timing circuit being mutually coupled and self-test pulse
Signal circuit, the period timing circuit are used to control the interval that the self-test pulse signal generates.
2. earth leakage protective device as described in claim 1, which is characterized in that the self-test pulse signal circuit includes switch
Pipe, the period timing circuit are coupled to the switching tube and control whether the switching tube is connected, to described by making
Switching tube is connected to generate the self-test pulse signal, and the timing element in the period timing circuit passes through the electric leakage
Stream detection module discharge or discharged via the first discharge paths by the leakage current test module.
3. earth leakage protective device as claimed in claim 2, which is characterized in that first selftest module and the switch drive
Component is operated in respectively in the different half cycles of alternating current.
4. earth leakage protective device as claimed in claim 3, which is characterized in that the self-test pulse signal circuit further includes and institute
The shunt reference source that switching tube is connected in series with is stated, the period 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, which is characterized 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 period timing circuit.
6. earth leakage protective device as claimed in claim 5, which is characterized in that when the power module is only the self-test pulse
When signal circuit is powered, the period timing circuit is coupled directly to detection of electrical leakage ring to take electricity.
7. earth leakage protective device as claimed in claim 2, which is characterized 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 period timing circuit discharges by described first
Branch discharges.
8. earth leakage protective device as claimed in claim 7, which is characterized in that first discharge paths are examined prior to the electric leakage
Survey device in discharge paths and be connected.
9. earth leakage protective device as claimed in claim 3, which is characterized in that the self-test pulse signal circuit further includes operation
The output end of amplifier, the operational amplifier is coupled to the switching tube, and in-phase end is coupled to biasing circuit, reverse side coupling
To the period timing circuit.
10. earth leakage protective device as claimed in claim 2, which is characterized in that the self-test pulse signal circuit further include with
The concatenated light-emitting component of switching tube.
11. earth leakage protective device as described in claim 1, which is characterized in that further include the second selftest module, described second certainly
It includes resistance, reset button and the electric wire across detection of electrical leakage ring to examine module, when the reset button is pressed, the electricity
The leakage current signal of simulation is generated on line.
12. earth leakage protective device as claimed in claim 2, which is characterized in that the period timing circuit is via voltage stabilizing element
It is coupled to the switching tube, to extend the generation interval of the self-test pulse signal.
13. earth leakage protective device as claimed in claim 2, which is characterized in that further include in parallel with the timing element steady
Press element.
14. earth leakage protective device as claimed in claim 7, which is characterized 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 |
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| CN201710212497.7A CN108666972B (en) | 2017-04-01 | 2017-04-01 | Leakage protector |
| US15/586,952 US9871366B1 (en) | 2016-07-13 | 2017-05-04 | Leakage current detection and protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212497.7A CN108666972B (en) | 2017-04-01 | 2017-04-01 | Leakage protector |
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| CN108666972B CN108666972B (en) | 2024-04-19 |
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| CN201710212497.7A Active CN108666972B (en) | 2016-07-13 | 2017-04-01 | Leakage protector |
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| WO2020228104A1 (en) * | 2019-05-10 | 2020-11-19 | 浙江大学 | Self-check chip of leakage protector |
| CN112162214A (en) * | 2020-08-26 | 2021-01-01 | 浙江朗威微系统有限公司 | Periodic test device and method for leakage detection circuit |
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| CN108666972B (en) | 2024-04-19 |
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