CN107026427B - Use electric detection means - Google Patents
Use electric detection means Download PDFInfo
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- CN107026427B CN107026427B CN201610074697.6A CN201610074697A CN107026427B CN 107026427 B CN107026427 B CN 107026427B CN 201610074697 A CN201610074697 A CN 201610074697A CN 107026427 B CN107026427 B CN 107026427B
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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
- H02H3/325—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 involving voltage comparison
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Electric detection means, including self-test or electric leakage selection trigger unit are used the present invention relates to a kind of, for selecting leak current fault detection pattern or Auto-Sensing Mode；Self-test unit, for periodically generating simulation electric leakage signal in Auto-Sensing Mode；And leak current fault detection unit, for detecting leak current fault signal in leak current fault detection pattern, and in Auto-Sensing Mode, electric leakage signal is simulated in detection；Wherein, self-test or electric leakage selection trigger unit are also used to disconnect power supply in leak current fault, and send self-detection result to self-test unit according to whether leak current fault detection unit detects simulation electric leakage signal；Wherein, self-test unit is also used to show self-detection result.The technical solution provided according to the present invention to be greatly improved with the safety coefficient of electric detection means.
Description
Technical field
The present invention relates to domestic circuit fields, and in particular, to a kind of to use electric detection means.
Background technique
As what the continuous improvement and electric equipment products of people 's material life level used becomes increasingly popular, people make electric appliance
Also increasingly paid attention to safety.Therefore the earth detector with defencive function comes into being.But in actual use a, side
Face is not the requirement that each user can defer to " testing before use ", to not can guarantee leakage circuit breakers
Function before use is normal；On the other hand, it even if people have made using preceding test earth leakage protective device, but was using
Cheng Zhong, as fruit product creepage protection function lose (such as one have leakage protecting plug electric heater, used in electrification
The damage of the certain components of Cheng Yinwei and cause defencive function to be lost), when electric appliance leaks electricity, earth leakage protective device can not just be provided
The warning of electric leakage is cut off the power, so as to will lead to the generation of personal injury accident.
Furthermore the earth leakage protective device of existing solenoid type can not adapt to the functional requirement that electrical appliance powers on automatically.
Therefore, need a kind of relay system that can be provided simultaneously with detection of electrical leakage and self-checking function uses electric detection means.
Summary of the invention
Therefore, the purpose of the present invention is to provide a kind of electrical connections with electric detection means and with this with electric detection means
Equipment.This can be achieved at the same time the function of detection of electrical leakage and self-test with electric detection means.
To achieve the above object, the first aspect of the present invention provides a kind of electric detection means, comprising: self-test or electric leakage
Trigger unit is selected, for selecting leak current fault detection pattern or Auto-Sensing Mode；Self-test unit, in the Auto-Sensing Mode
Periodically generate simulation electric leakage signal；And leak current fault detection unit, for being examined in the leak current fault detection pattern
Leak hunting electric fault, and the simulation electric leakage signal is detected in the Auto-Sensing Mode；Wherein, the self-test or electric leakage selection touching
Bill member is also used to disconnect power supply in the leak current fault, and whether detects institute according to the leak current fault detection unit
It states simulation electric leakage signal and sends self-detection result to the self-test unit；Wherein, the self-test unit be also used to show it is described from
Examine result.
By the above-mentioned means, the function according to the present invention that can be achieved at the same time detection of electrical leakage and self-test with electric detection means
Energy.
In a kind of embodiment with electric detection means according to the present invention, the self-test or electric leakage selection trigger unit
It is silicon-controlled including first, by be connected described first it is silicon-controlled select the leak current fault detection pattern, and pass through disconnection
Described first silicon-controlled selects the Auto-Sensing Mode.
In a kind of embodiment with electric detection means according to the present invention, the self-test or electric leakage selection trigger unit
Including the 4th transistor and the 5th transistor, by disconnecting the 4th transistor and the 5th transistor being connected to select
State leak current fault detection pattern, and by the 4th transistor is connected and disconnect the 5th transistor come select it is described from
Inspection mode.
In a kind of embodiment with electric detection means according to the present invention, the self-test or electric leakage selection trigger unit
It is described to select by disconnecting the 4th transistor and the optical coupled switch being connected including the 4th transistor and optocoupler sub switch
Leak current fault detection pattern, and the self-test mould is selected by the way that the 4th transistor is connected and disconnects the optical coupled switch
Formula.
The reliability of circuit is improved by replacing transistor with optical coupled switch according to aforesaid way.
In a kind of embodiment with electric detection means according to the present invention, the self-test or electric leakage selection trigger unit
Further include second silicon-controlled, silicon-controlled disconnects electricity by being connected described second in the leak current fault detection pattern
Source, and silicon-controlled be turned on or off in the Auto-Sensing Mode by described second come described in being sent to the self-test unit
Self-detection result.
In a kind of embodiment with electric detection means according to the present invention, the self-test or electric leakage selection trigger unit
It further include Fisrt fault display unit, the Fisrt fault display unit is for showing the leak current fault.
It in this way, can be clearly to the leak current fault of user and maintenance personnel's indicating circuit.
In a kind of embodiment with electric detection means according to the present invention, the self-test unit includes: reference voltage
Subelement is generated, for generating reference voltage；Subelement is arranged in period, and for generating the voltage of mechanical periodicity, the period becomes
Different phase of the voltage of change in the period is respectively greater than and is less than the reference voltage；Comparator is used for the ginseng
Examine the voltage of voltage and the mechanical periodicity；And the first transistor, for generating the simulation according to the comparison result
Electric leakage signal.
In this way, self-test unit can periodically generate simulation electric leakage signal.
In a kind of embodiment with electric detection means according to the present invention, the self-test unit further includes the second failure
Display unit, second fault display unit is for showing the failure with electric detection means.
In this way, the failure with electric detection means can be clearly indicated to user and maintenance personnel.
In a kind of embodiment with electric detection means according to the present invention, the leak current fault detection unit includes:
Detection coil, for detecting leakage current or the simulation electric leakage signal；Processor, for by the detection knot of the detection coil
Fruit is sent to the self-test or electric leakage selection trigger unit.
It is described to use electric detection means in a kind of embodiment with electric detection means according to the present invention further include: electricity
Source unit, for being powered to be described with electric detection means；And relay holding unit, it is opened for guard relay after the power-up
The closure of pass.
In a kind of embodiment with electric detection means according to the present invention, the relay holding unit includes resetting
Switch, second transistor and third transistor, wherein make the second transistor and described by being closed the reset switch
Third transistor remains closed, so that the relay switch remains closed.
In a kind of embodiment with electric detection means according to the present invention, the relay holding unit includes relay
Device capacitor, second transistor and third transistor, wherein second crystal is made by the relay capacitor after the power-up
Pipe and the third transistor remain closed, so that the relay switch remains closed.
In this way, it can be realized powering on automatically for the electric appliance without manual closing reset switch.
In a kind of embodiment with electric detection means according to the present invention, the relay holding unit is and relay
The auxiliary switch of device linkage.
In this way, the use for reducing electronic component improves the service life and unfailing performance of product.
In addition, the second aspect of the present invention provides a kind of electric connecting device, with electricity consumption according to the present invention
Detection device.
To sum up, it is powered according to the solution of the present invention by relay holding unit proof load；By leak current fault detection unit
Monitor power supply circuit operating status；By the working condition of self-test unit monitoring related circuit；It is single by self-test or failure selection triggering
Member makes the final process of electric leakage signal, so that being greatly improved with the safety coefficient of electric detection means.
Detailed description of the invention
By reading the detailed description referring to made by the following drawings to non-limiting embodiment, other spies of the invention
Sign, objects and advantages will become more apparent upon, in which:
Fig. 1 shows a kind of logic diagram with electric detection means of embodiment according to the present invention；
Fig. 2 shows the electrical block diagrams of the first embodiment according to the present invention with electric detection means；
Fig. 3 shows the electrical block diagram of the second embodiment according to the present invention with electric detection means；
Fig. 4 shows the electrical block diagram of the 3rd embodiment according to the present invention with electric detection means；And
Fig. 5 shows the electrical block diagram of the fourth embodiment according to the present invention with electric detection means.
Specific embodiment
In the following detailed description of the preferred embodiment, reference is constituted to the appended attached drawing of present invention a part.Institute
Attached attached drawing, which has been illustrated by way of example, can be realized specific embodiment.Exemplary embodiment is not intended to
Exhaustive all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, can use other
Embodiment can also carry out the modification of structure or logic.Therefore, it is below specific descriptions and it is unrestricted, and this
The range of invention is limited only by the following claims.
Fig. 1 shows a kind of logic diagram with electric detection means of embodiment according to the present invention.
As shown in Figure 1, including self-test or electric leakage selection trigger unit 3,4 and of leak current fault detection unit with electric detection means
Self-test unit 5.
Wherein, self-test or electric leakage selection trigger unit 3 are for selecting leak current fault detection pattern or Auto-Sensing Mode.Work as electric leakage
When signal is self-test signal, then leak current fault detection unit is notified to complete self-test；When the electric leakage signal in circuit is circuit electric leakage
When fault-signal, then cut off the power.
Leak current fault detection unit 4 is used to detect the leakage current on supply lines, when leakage current is greater than or equal to leakage current threshold
When value, then driving switch element come disconnect supply access or complete self-test.
Self-test unit 5 is used to detect the operation conditions of self-test or electric leakage selection trigger unit 3 and detection of electrical leakage unit 4.
In addition, further including power supply unit 1 and relay holding unit 2 with electric detection means.
Wherein, power supply unit 1 is used for be powered with electric detection means.
Relay holding unit 2 is worked normally for guard relay after the power-up, so that it is guaranteed that being load supplying.
Fig. 2 shows the electrical block diagrams of the first embodiment according to the present invention with electric detection means.
As shown in Fig. 2, relay holding unit 2 includes at least: reset switch RESET, second transistor Q4, third crystal
Pipe Q5, resistance R18, relay coil and relay switch SW1.
Self-test or electric leakage selection trigger unit 3 include at least: the first silicon-controlled Q2, the second silicon-controlled Q3, the 5th transistor Q8
And Fisrt fault display unit D6-2。
Leak current fault detection unit 4 includes at least: processor IC1 and detection coil.
Self-test unit 5 includes at least: comparator IC2, the second fault display unit D6-1, the first transistor Q1, multiple resistance
R1-R8And multiple capacitor C1-C3。
The working method of each unit when detection leak current fault is described below.
When detecting leak current fault, after reset switch RESET closure, second transistor Q4It is connected, then third transistor Q5
It is connected and passes through resistance R18Keep latching circuit conducting.At this point, relay coil normal power supply, relay switch SW1 closure
So that load is connected, and Fisrt fault display unit D6-2Holding is always on.
When self-test or leak current fault selection trigger unit 3 select leak current fault triggering, so that the first silicon-controlled Q2Conducting.
Whether there is leakage current generation on L the and N line of detection coil detection power supply in leak current fault detection unit 4.And it is right
In self-test unit 5, due to self-test or electric leakage selection trigger unit3Leak current fault triggering is selected, then self-test unit 5 does not work.
If generated at this time without leakage current, the pin 5 of the processor IC1 in leak current fault detection unit 4 exports low
Level, so that the second silicon-controlled Q3It can not be connected, then Q2-D11-Q3Circuit can not be connected, so that relay coil will not be short
Road decompression, load supplying are normal.
And the detection line if there is the leakage current for reaching leakage current threshold to generate at this time, in leak current fault detection unit 4
Circle exports induced voltage to the pin 1 and 3 of processor IC1 after receiving leakage current, then pin 5 exports high level, and second can
Control silicon Q3Conducting, since self-test or failure selection trigger unit 3 select leak current fault triggering, then Q2-D11-Q3Circuit is formed, and is caused
Relay coil is short-circuited decompression, so that relay switch SW1 is disconnected, load supplying is cut off, Fisrt fault display unit D6-2
Extinguish.
The working method of each unit when circuitry self test is described below.
In circuitry self test, after reset switch RESET closure, second transistor Q4It is connected, then third transistor Q5Conducting
And pass through resistance R18Keep latching circuit conducting.At this point, relay coil normal power supply, relay switch SW1 be closed so that
Connection, and Fisrt fault display unit D must be loaded6-2Holding is always on.
Self-test or leak current fault selection trigger unit 3 select self-test triggering, i.e., so that the first silicon-controlled Q2 is disconnected.
Whether there is simulation leakage current to generate on L the and N line of detection coil detection power supply in leak current fault detection unit 4.
And self-test unit 5 can periodically generate simulation electric leakage signal.
Self-test unit 5 includes that subelement is arranged the period, and period setting subelement includes the resistance R being connected in series4And electricity
Hold C2, period setting subelement is further coupled to the input terminal (anode) of comparator.Resistance R on comparator IC24, capacitor C2Pass through
Resistance R1It is connected to N line, and passes through resistance R4Give capacitor C2Charging.
The anode of comparator IC2 is coupled to resistance R4With capacitor C2Between, for receiving capacitor C2On voltage signal；And
The cathode of comparator IC2 is coupled to by resistance R2、R3Composition reference voltage generate subelement, for receive reference voltage letter
Number.Period modulation component and reference voltage generate subelement and receive the voltage signal on N line.
As capacitor C2Voltage on (i.e. the anode of comparator IC2) is higher than R3Voltage on (i.e. the cathode of comparator IC2)
When, the output end overturning of comparator IC2, so that C point is high level, to form C-R5-Q1、C-R6-D6-1And C-R7-C3's
Circuit, and the second indicating fault D6-1It lights.
C point passes through resistance R5It is coupled to the first transistor Q1Base stage, therefore, C point once exports high level, then first is brilliant
Body pipe Q1Conducting, and make N-R8-Q1-D1- L forms current loop, draws to the detection coil in leak current fault detection unit 4
Presetting electric current I is enteredC(the ICMore than or equal to the threshold value I of leak current fault detection electric currentf)。
Detection coil receives ICElectric leakage signal simultaneously generates induced voltage, so that exporting high level on the pin 5 of processor IC1
Signal, the second silicon-controlled Q3Conducting.At this point, capacitor C2Pass through diode D5With the second silicon-controlled Q3It discharges, so that comparator
The cathode voltage of IC2 reduces rapidly.
When the positive level of comparator IC2 is flat lower than negative electricity, the output switching activity of comparator IC2, so that C point is low electricity
Flat, the first transistor Q1It is turned off and the second indicating fault D6-1Extinguish.At this point, detection coil does not detect electric leakage signal,
The then pin 5 of processor IC1 and the second silicon-controlled Q3Controlled stage be low level；Capacitor C2On charge released, under voltage
Drop, to be lower than the second silicon-controlled Q3With diode D5The threshold voltage of conducting；C2Due to the first silicon-controlled Q while electric discharge2And
Cut-off, and Q2-D11-Q3Circuit can not be formed so that the second silicon-controlled Q3It will not maintain after conducting, end after completing self-test.
Self-test unit can be repeated continuously above-mentioned process.
Situation 1: when being worked normally with electric detection means, after reset switch RESET closure, load supplying, then the first event
Hinder display unit D6-2It should keep being always on.The second fault display unit D when normal power-up, when self-test6-1It should periodically dodge
It is bright.If pressing test switch TEST, L-R is formed12The circuit of-N, circuit generate fault current, and relay coil circuit is disconnected
It opens, i.e. relay switch SW1 is disconnected, load power down, Fisrt fault display unit D6-2Extinguish.After multiplicating, then electricity consumption is proved
The function of detection device is normal.
Situation 2: after circuit electrification reset, if Fisrt fault display unit D6-2It cannot be always on or the second failure refers to
Show cells D6-1When being unable to periodic flicker, then fault display unit is abnormal, cannot be used continuously with electric detection means.
(such as the capacitor C if leak current fault detection unit 4 breaks down5Short circuit, processor IC1 damage etc.) and cause to leak
Electric protection function is lost；Or presetting current value IfBecome larger the leakage current I for causing self-test unit to generateCLess than If, at this point,
The pin 5 of processor IC1 will export low level, i.e., the second silicon-controlled Q3It is not turned on and (is also possible to the second silicon-controlled Q3Damage, example
Such as Q3Open circuit or Q3Trigger foot short circuit), the second fault indication unit D at this time6-1It persistently lights, to prompt user's earth leakage protective
Device cannot be used continuously.
If the second silicon-controlled Q at this time3, diode D5And D8It does not damage, then comparator IC2 will pass through resistance R7To electricity
Hold C3Charging, when current potential reaches setting value, diode D8With the second silicon-controlled Q3Conducting, comparator IC2 will persistently export high electricity
It is flat, the first transistor Q1Always it is connected, therefore, the second silicon-controlled Q3By constant conduction.When circuit is switched to electric leakage by self-test triggering
When failure triggers, the first silicon-controlled Q2Conducting, and Q2-D11-Q3Circuit conducting, relay coil are short-circuited decompression, so as to cause
Relay switch SW1 is disconnected, that is, is disconnected the electrically connected of input and output, so that product can not continue to use, to guarantee
User security.
If the first silicon-controlled Q2Short circuit then forms Q in circuitry self test2-D11-Q3Circuit, and cut off load.
If relay coil short circuit or open circuit, there is no electric current to pass through in coil, then the relay switch to link with coil
SW1 is disconnected.
If optocoupler damage (primary and secondary short circuit respectively or open circuit), L-R23Optocoupler secondary-D10-D6-2The circuit-N is disconnected
It opens, Fisrt fault display unit D6-2Extinguish.
If third transistor Q5Emitter and collector short circuit, then Q after failure triggers2-D11-Q3It is formed into a loop and keeps,
Relay switch SW1 is disconnected.
If second transistor Q4Emitter and collector short circuit, then Q after failure triggers2-D11-Q3It is formed into a loop and keeps,
Relay switch SW1 is disconnected.
In addition, capacitor C20Select automatic (powering on rear relay switch SW1 to be closed automatically) or manually (pressure reset switch
RESET then relay switch SW1 be closed) on Electricity Functional.
Trigger unit 3, the transistor Q when self-test signal comes are selected for self-test or leak current fault8And Q2It disconnects, Q3Conducting；
The transistor Q when leak current fault comes8、Q2And Q3All be connected.
Fig. 3 shows the electrical block diagram of the second embodiment according to the present invention with electric detection means.
Compared with embodiment shown in Figure 2, embodiment in Fig. 3 by relay holding circuit by with relay linkage
Auxiliary switch replaces, and reduces the use of electronic component, improves the service life and unfailing performance of product.
In addition, similar with the embodiment in Fig. 2, after reset switch closure, relay obtains electric actuation, auxiliary switch K and
Relay switch SW1 closure, relay is self-locking by auxiliary switch K and normal power supply, circuit load are connected.
Self-test and earth leakage detection functions and normal and fault condition in Fig. 3 is referring to the embodiment in Fig. 2, herein no longer
It repeats.
Fig. 4 shows the electrical block diagram of the 3rd embodiment according to the present invention with electric detection means.
As shown in figure 4, relay holding unit 2 includes at least: second transistor Q4, third transistor Q5, multiple resistance
R18-R20, relay coil, relay switch SW1 and Fisrt fault display unit D6-2。
Self-test or electric leakage selection trigger unit 3 include at least: the 4th transistor Q7, the second silicon-controlled Q3, the 5th transistor
Q8, reset switch RESET and resistance R23。
Leak current fault detection unit 4 includes at least: processor IC1 and detection coil.
Self-test unit 5 includes at least: comparator IC2, the second fault display unit D6-1, the first transistor Q1, multiple resistance
R1-R8And multiple capacitor C1-C3。
With reference to Fig. 4, separately below to self-test or leak current fault selection trigger unit 3, leak current fault detection unit 4 and self-test
Working method of the unit 5 when detecting leak current fault and self-test is illustrated.
The working method of each unit when description detects leak current fault first.
After reset switch RESET closure, A-R18-Q8-B-R20-R19-Q5-D6-2Circuit is formed, transistor Q8、Q4And Q5It leads
Logical, relay coil normal power supply, relay switch SW1 closure load is connected, Fisrt fault display unit D6-2It is always on.
Selection failure triggers in self-test or leak current fault selection trigger unit 3, then the 5th transistor Q8Conducting, the 4th crystal
Pipe Q7Cut-off.
Whether there is leakage current generation on L, N line of detection coil detection power supply in leak current fault detection unit 4.
If generating at this time without leakage current, the pin 5 of processor IC1 exports low level, the second silicon-controlled Q3It can not lead
Logical, so that relay coil is working properly, load supplying is normal.
If there is the leakage current for reaching leakage current threshold to generate at this time, the detection coil in leak current fault detection unit 4 is connect
The pin 1 and 3 of induced voltage to processor IC1 is exported after receipts leakage current, so that pin 5 exports high level, so that second is controllable
Silicon Q3Conducting, due to the selection failure triggering in self-test or leak current fault selection trigger unit 3, then A-R18-Q8-B-Q3Circuit shape
At and keep optocoupler to be connected, the current potential of B point declines rapidly, and transistor Q4And Q5Cut-off, leads to relay coil current supply circuit
Open circuit, so that relay switch SW1 is disconnected, load supplying is cut off, Fisrt fault display unit D6-2Extinguish.
The working method of each unit when circuitry self test is described below.
After reset switch RESET closure, A-R18-Q8-B-R20-R19-Q5-D6-2Circuit is formed, transistor Q8、Q4And Q5It leads
Logical, relay coil normal power supply, load is connected, Fisrt fault display unit D6-2It is always on.
Self-test or failure selection trigger unit 3 select self-test triggering, then the 4th transistor Q7Conducting, the 5th transistor Q8It cuts
Only.
Whether there is leakage current generation on L, N line of detection coil detection power supply in leak current fault detection unit 4.
Self-test unit 5 periodically generates electric leakage signal.
Self-test unit 5 includes that subelement is arranged the period, and period setting subelement includes the resistance R4 and electricity being connected in series
Hold C2, period setting subelement is further coupled to the input terminal (anode) of comparator IC2.Resistance R on comparator IC24, capacitor C2
Pass through resistance R1It is connected to N line, gives capacitor C by resistance R42Charging.
The anode of comparator IC2 is coupled to resistance R4And C2Between, for receiving capacitor C2On voltage signal, comparator
The cathode of IC2 is coupled to by resistance R2、R3The reference voltage of composition generates subelement, for receiving reference voltage signal.Period tune
Whole group part and reference voltage generate subelement and receive the voltage signal on N line.
As capacitor C2Voltage on (i.e. the anode of comparator IC2) is higher than R3When voltage on (i.e. the cathode of IC2), IC2's
There is high level, D-R in output switching activity, C point23-Q7、C-R5-Q1、C-R6-D6-1、C-R7-C3Circuit is formed, the second indicating fault point
It is bright；Q7It is connected and Q8Cut-off.Self-test or failure selection trigger unit 3 select self-test triggering to complete.
C point is coupled to the first transistor Q by resistance R51Base stage, therefore, C point once exports high level, Q1Just it is connected,
So that N-R18-Q1-D1- L line forms current loop, introduces to the detection coil in leak current fault detection unit 4 presetting
Electric current IC(electric current ICIt should be greater than or detect equal to leak current fault the threshold value I of electric currentf)。
Detection coil receives electric leakage signal and generates induced voltage, so that high level signal is exported on the pin 5 of IC1, from
And make the second silicon-controlled Q3Conducting.At this point, capacitor C2Pass through D5、Q3It discharges, so that the cathode voltage of comparator IC2 is fast
Speed reduces.
When the positive level of comparator IC2 is flat lower than negative electricity, the output end overturning of comparator IC2, C point is low electricity
It is flat, the first transistor Q1It is turned off, the second indicating fault extinguishes.Detection coil does not detect electric leakage signal at this time, and IC1's draws
Foot 5 and Q3Controlled stage be low level；Capacitor C2On charge released, voltage decline, thus be lower than the second silicon-controlled Q3With
Diode D5The threshold voltage of conducting；Capacitor C2A-R while electric discharge18-R13-B-Q3Circuit is formed, so that Q3It will not be tieed up after conducting
It holds, ends after completing self-test.Self-test unit repeats the above process.
Situation 1: when being worked normally with electric detection means, after reset switch RESET closure, load supplying, then the first event
Hinder display unit D6-2It should keep being always on.The second fault display unit D when normal power-up, when self-test6-1It should periodically dodge
It is bright.If pressing test switch TEST, L-R is formed11The circuit of-N, relay coil circuit disconnect, i.e. relay switch SW1
It disconnects, load power down, Fisrt fault display unit D6-2Extinguish.After multiplicating, then the function of proof electric detection means is just
Normal.
Situation 2: after circuit electrification reset, if Fisrt fault display unit D6-2It cannot be always on or the second failure refers to
Show cells D6-1When being unable to periodic flicker, then fault display unit is abnormal, cannot be used continuously with electric detection means.
(such as the capacitor C if leak current fault detection unit 4 breaks down5Short circuit, processor IC1 damage etc.) and cause to leak
Electric protection function is lost；Or presetting current value IfBecome larger the leakage current I for causing self-test unit to generateCLess than If, at this point,
The pin 5 of processor IC1 will export low level, i.e., the second silicon-controlled Q3It is not turned on and (is also possible to the second silicon-controlled Q3Damage, example
Such as Q3Open circuit or Q3Trigger foot short circuit), the second fault indication unit D at this time6-1It persistently lights, to prompt user's earth leakage protective
Device cannot be used continuously.
If the second silicon-controlled Q at this time3, diode D5And D8It does not damage, then comparator IC2 will pass through resistance R7To electricity
Hold C3Charging, when current potential reaches setting value, diode D8With the second silicon-controlled Q3Conducting, comparator IC2 will persistently export high electricity
Flat, the first transistor Q1 is connected always, therefore, the second silicon-controlled Q3By constant conduction.When circuit is switched to leakage by self-test triggering
When electric fault triggers, A-R18-Q8-B-Q3Circuit conducting, optocoupler conducting, transistor Q4、Q5Cut-off, relay coil circuit disconnect,
It is disconnected so as to cause relay switch SW1, that is, the electrically connected of input and output is disconnected, so that product can not continue to make
With to guarantee user security.
If relay coil short circuit or open circuit, there is no electric current to pass through in coil, then the relay switch to link with coil
SW1 is disconnected；
If the 5th transistor Q8(short circuit or open circuit) is damaged, then transistor Q4Or Q5In Q3Self-test ends when being connected, relay
Device wire loop disconnects；
If the 4th transistor Q7 damage (short circuit or open circuit), transistor Q4Or Q5In Q3Self-test ends when being connected, relay
Device wire loop disconnects；
If optocoupler damage (short circuit or open circuit), transistor Q4Or Q5In Q3At least one ends when conducting, and relay returns
Road disconnects；
If transistor Q4、Q5One of damage (short circuit or open circuit), due to Q4、Q5It is connected in relay circuit, therefore
When barrier shutdown, Q4、Q5Electricity can all turn off, then Q4、Q5Damage will not influence circuit turn-off function.
In addition, capacitor C20Select automatic (powering on rear relay switch SW1 to be closed automatically) or manually (pressure reset switch
RESET then relay switch SW1 be closed) on Electricity Functional.
Trigger unit 3 is selected for self-test or leak current fault, when self-test unit is issued from signal, transistor Q7Conducting, Q8
It disconnects, Q3Conducting；The transistor Q when being connected to leak current fault7It closes, Q2Conducting, Q3Conducting.
Fig. 5 shows the electrical block diagram of the fourth embodiment according to the present invention with electric detection means.
Compared with the embodiment being shown in FIG. 4, embodiment shown in Fig. 5 will be in self-test or failure selection trigger unit
The 5th transistor Q8With optical coupled switch U4Instead of improving the reliability of circuit.
Similarly with embodiment shown in Figure 2, after reset switch is closed, relay obtains electric actuation, and circuit load connects
It is logical.
Self-test and detection of electrical leakage and normal and failure function in Fig. 5 is referring to the embodiment in Fig. 4.
Although specific embodiments of the present invention have been described above, those skilled in the art can be in appended power
Benefit makes various changes and modifications in the range of requiring.
Claims (14)
1. a kind of use electric detection means characterized by comprising
Self-test or electric leakage selection trigger unit, for selecting leak current fault detection pattern or Auto-Sensing Mode；
Self-test unit, for periodically generating simulation electric leakage signal in the Auto-Sensing Mode；And
Leak current fault detection unit, for detecting leak current fault in the leak current fault detection pattern, and in the self-test
The simulation electric leakage signal is detected in mode；
Wherein, the self-test or electric leakage selection trigger unit are also used to disconnect power supply in the leak current fault, and according to institute
State whether leak current fault detection unit detects that the simulation electric leakage signal sends self-detection result to the self-test unit；
Wherein, the self-test unit is also used to show the self-detection result.
2. according to claim 1 use electric detection means, which is characterized in that the self-test or electric leakage selection trigger unit packet
Include it is first silicon-controlled, by be connected described first it is silicon-controlled select the leak current fault detection pattern, and by disconnecting institute
It states first and silicon-controlled selects the Auto-Sensing Mode.
3. according to claim 1 use electric detection means, which is characterized in that the self-test or electric leakage selection trigger unit packet
The 4th transistor and the 5th transistor are included, it is described to select by disconnecting the 4th transistor and the 5th transistor being connected
Leak current fault detection pattern, and the self-test is selected by the way that the 4th transistor is connected and disconnects the 5th transistor
Mode.
4. according to claim 1 use electric detection means, which is characterized in that the self-test or electric leakage selection trigger unit packet
The 4th transistor and optical coupled switch are included, selects the electric leakage by disconnecting the 4th transistor and the optical coupled switch being connected
Fault detection mode, and the Auto-Sensing Mode is selected by the way that the 4th transistor is connected and disconnects the optical coupled switch.
5. according to any one of claim 2 to 4 use electric detection means, which is characterized in that the self-test or electric leakage choosing
Selecting trigger unit further includes second silicon-controlled, silicon-controlled is broken in the leak current fault detection pattern by being connected described second
Switch power supply, and sent by the described second silicon-controlled be turned on or off to the self-test unit in the Auto-Sensing Mode
The self-detection result.
6. according to any one of claim 1 to 4 use electric detection means, which is characterized in that the self-test or electric leakage choosing
Selecting trigger unit further includes Fisrt fault display unit, and the Fisrt fault display unit is for showing the leak current fault.
7. according to any one of claim 1 to 4 use electric detection means, which is characterized in that the self-test unit includes:
Reference voltage generates subelement, for generating reference voltage；
Subelement is arranged in period, for generating the voltage of mechanical periodicity, the difference of the voltage of the mechanical periodicity in the period
Stage is respectively greater than and is less than the reference voltage；
Comparator, the voltage for the reference voltage and the mechanical periodicity；And
The first transistor, for generating the simulation electric leakage signal according to the comparison result.
8. according to claim 7 use electric detection means, which is characterized in that the self-test unit further includes that the second failure is aobvious
Show unit, second fault display unit is for showing the failure with electric detection means.
9. according to any one of claim 1 to 4 use electric detection means, which is characterized in that the leak current fault detection
Unit includes:
Detection coil, for detecting leakage current or the simulation electric leakage signal；
Processor, for the testing result of the detection coil to be sent to the self-test or electric leakage selection trigger unit.
10. according to any one of claim 1 to 4 use electric detection means, which is characterized in that described to use electric detection means
Further include:
Power supply unit, for being powered to be described with electric detection means；And
Relay holding unit, the closure for the switch of guard relay after the power-up.
11. according to claim 10 use electric detection means, which is characterized in that the relay holding unit includes resetting
Switch, second transistor and third transistor, wherein make the second transistor and described by being closed the reset switch
Third transistor remains closed, so that the relay switch remains closed.
12. according to claim 10 use electric detection means, which is characterized in that the relay holding unit includes electricity
Hold, second transistor and third transistor, wherein the second transistor and described the are made by the capacitor after the power-up
Three transistors remain closed, so that the relay switch remains closed.
13. according to claim 10 use electric detection means, which is characterized in that the relay holding unit is and relay
The auxiliary switch of device linkage.
14. a kind of electric connecting device uses electric detection means with according to any one of claim 1 to 13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074697.6A CN107026427B (en) | 2016-02-02 | 2016-02-02 | Use electric detection means |
| US15/080,077 US10069292B2 (en) | 2016-02-02 | 2016-03-24 | Leakage current detection device for appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074697.6A CN107026427B (en) | 2016-02-02 | 2016-02-02 | Use electric detection means |
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| Publication Number | Publication Date |
|---|---|
| CN107026427A CN107026427A (en) | 2017-08-08 |
| CN107026427B true CN107026427B (en) | 2019-10-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769159A (en) * | 2017-10-25 | 2018-03-06 | 浙江致威电子科技有限公司 | A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment |
| CN110146768B (en) * | 2019-05-05 | 2020-08-04 | 浙江大学 | Leakage protector self-checking device and leakage protector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| US8400321B2 (en) * | 2010-11-15 | 2013-03-19 | General Electric Company | Methods and apparatus for operating an electronic trip device |
| CN204389621U (en) * | 2014-12-15 | 2015-06-10 | 益而益(集团)有限公司 | With electric detection means and arrangements of electric connection |
| CN205429696U (en) * | 2016-02-02 | 2016-08-03 | 益而益(集团)有限公司 | With electric detection means and electric jointing equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9978553B2 (en) * | 2012-06-20 | 2018-05-22 | Wendell E Tomimbang | Apparatus, system and method for total protection from electrical faults |
-
2016
- 2016-02-02 CN CN201610074697.6A patent/CN107026427B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8400321B2 (en) * | 2010-11-15 | 2013-03-19 | General Electric Company | Methods and apparatus for operating an electronic trip device |
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN204389621U (en) * | 2014-12-15 | 2015-06-10 | 益而益(集团)有限公司 | With electric detection means and arrangements of electric connection |
| CN205429696U (en) * | 2016-02-02 | 2016-08-03 | 益而益(集团)有限公司 | With electric detection means and electric jointing equipment |
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