CN109193560A - Anti-interference overriding binary channels earth leakage protective device - Google Patents
Anti-interference overriding binary channels earth leakage protective device Download PDFInfo
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- CN109193560A CN109193560A CN201811030133.8A CN201811030133A CN109193560A CN 109193560 A CN109193560 A CN 109193560A CN 201811030133 A CN201811030133 A CN 201811030133A CN 109193560 A CN109193560 A CN 109193560A
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- circuit
- signal detector
- electric leakage
- resistance
- leakage signal
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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
-
- 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
-
- 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
- H02H3/006—Calibration or setting of parameters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of anti-interference overriding binary channels earth leakage protective device.It includes power supply stabilization circuit, first passage reference circuit, first passage electric leakage signal detector, second channel reference circuit, second channel electric leakage signal detector, immunity module circuit, logic processor and latch circuit output.There are three features for present invention tool: first is that circuit has very strong noiseproof feature, second is that setting trims circuit for trimming the leakage current test point of circuit, third is that being arranged using independent binary channels earth leakage protective, two interchannels have very strong consistency.This makes leakage protection circuit more meet practical earth leakage protective requirement in design.
Description
Technical field
The present invention relates to earth leakage protective fields, in particular to a kind of to have noiseproof feature leakage protection circuit.
Background technique
Earth leakage protective device passes through the development and popularization and application of many years, and formed one has quite rule in kind and specification
The product serial of mould.It played an important role in the safeguard protection of low voltage electric network.The earth leakage protective device being commonly used
Anti-interference ability is poor.It is most important the reason is that zero sequence transformer used in earth leakage protective device is highly susceptible to high-frequency electromagnetic
The interference of wave signal generates very big interference signal in the input terminal of earth leakage protective device.Earth leakage protective device receives time interference letter
It number is easy to generate malfunction.
The required precision of the leakage current monitoring point of earth leakage protective device is stepped up on the market simultaneously, and the deviation of technique
It can not thoroughly solve at present.Common practice is to carry out test stepping to circuit, and this provides for improved the costs of entire circuit.
After domestic variable frequency device uses converters, there can be current leakage.Reason is that power converter is deposited
In capacitive distribution parameter, and frequency conversion equipment is particularly easy to generate current leakage often in high-frequency work state.On the other hand
If firewire and zero curve leak electricity simultaneously, even if electric leakage is more than the threshold value of setting, earth leakage protective device will not be overturn.This is just deposited
In some potential safety problems.
Summary of the invention
In order to solve the problems in background technique, it is excellent that the present invention provides a kind of interference free performance, leakage current test point
It can trim, while the binary channels circuit for electric leakage protector of protection zero line firewire and ground wire.
The technical solution adopted by the present invention to solve the technical problems is: a kind of anti-interference overriding binary channels electric leakage guarantor
Protect device circuit, circuit includes: power supply stabilization circuit, first passage reference circuit, first passage electric leakage signal detector, second logical
Road reference circuit, second channel electric leakage signal detector, immunity module circuit, logic processor and latch circuit output.
Power supply stabilization circuit is first passage reference circuit, first passage electric leakage signal detector, second channel benchmark electricity
Road, second channel electric leakage signal detector and latch circuit output provide operating voltage.
Optionally first passage reference circuit input terminal connects power supply stabilization circuit, and the first output end connects first passage leakage
The positive input terminal of electrical signal detection device, second output terminal connect the bias current end of first passage electric leakage signal detector, are used for
A bias current and a reference voltage are provided to first passage electric leakage signal detector.
Optionally first passage electric leakage signal detector, for detecting the thresholding of 1 channel leakage current, first passage electric leakage letter
The negative input of number detector inputs detection of electrical leakage signal, and the anode of first passage electric leakage signal detector inputs first passage
The reference voltage that reference circuit provides, prescribes a time limit when leakage current reaches turnover door, first passage electric leakage signal detector output switching activity.
Optionally logic processor, first input end connect the output end of first passage electric leakage signal detector, and second is defeated
Enter the output end of end connection second channel electric leakage signal detector, the output end of logic processor is connected to latch circuit output
Input terminal guarantees the independence between two channels for logic control between two channels.
Optionally first passage reference circuit and second channel reference circuit use identical circuit structure and same numerical value
Reference voltage output.It is further characterized in that first passage electric leakage signal detector and second channel electric leakage signal detector use
Identical circuit structure and identical circuit performance.Ensure that there there is again existing independence between first passage and second channel in this way
Very strong consistency.
Optionally leakage current test point can be trimmed, and leakage current test point can accurately be arranged, and be kept very strong
Batch consistency.Specifically it is to trim real positioned at first passage electric leakage signal detector and second channel electric leakage signal detector
It is existing.Specifically to the current collection of first passage electric leakage signal detector module and second channel electric leakage signal detector differential input end
Extremely concatenated resistance is trimmed.It realizes that three ranks are burnt to adjust.Specifically first passage electric leakage signal detector module and second channel
Electric leakage signal detector all respectively there are four trimming a little, burns tune ratio 1:2:4.
Optionally immunity module circuit: it is logical that first resistor R1, second resistance R2 (9) and internal parasitic capacitances constitute first
Road anti-jamming circuit, 3rd resistor R3, the 4th resistance and internal parasitic capacitances constitute second channel anti-jamming circuit.With most simple
Clean external circuits.
The beneficial effects of the present invention are: first is that there is circuit very strong noiseproof feature to avoid earth leakage protective device malfunction completely
Make.Second is that setting trims circuit for trimming the leakage current test point of circuit, reduce the difficulty of circuit production and debugging；Third is that
It is arranged using complete independent binary channels earth leakage protective, two interchannels have very strong consistency.Major loop and ground are monitored simultaneously
The leak current fault of line, so that leakage protection circuit more meets practical earth leakage protective requirement in design.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the embodiment of the present invention.
Fig. 2 is the circuit diagram of the power supply stabilization circuit of the embodiment of the present invention.
Fig. 3 is the circuit diagram of the first passage reference circuit of the embodiment of the present invention, second channel reference circuit.
Fig. 4 is the electricity of the first passage electric leakage signal detector of the embodiment of the present invention, second channel electric leakage signal detector
Lu Tu.
Fig. 5 is the immunity module circuit diagram of the embodiment of the present invention.
Fig. 6 is the logic processor circuit diagram of the embodiment of the present invention.
Fig. 7 is the circuit diagram of the latch circuit output of the embodiment of the present invention.
Specific embodiment
Embodiments of the present invention is further illustrated with reference to the accompanying drawing:
Referring to Fig. 1, being the electrical block diagram of leakage protection circuit of the present invention, including power supply stabilization circuit (1), first is logical
Road reference circuit (2), first passage electric leakage signal detector (4), second channel reference circuit (3), second channel electric leakage signal
Detector (5), immunity module circuit (8,9,10,11), logic processor (6) and latch circuit output (7).
Power supply stabilization circuit (1), by external voltage clamper near the representative value of leakage protection circuit operating voltage；
The power supply stabilization circuit (1), please refer to Fig. 2: transistor Q1 is power supply switch tube, provides biased electrical for internal circuit
Pressure.Bias voltage is determined by resistance R19, voltage-stabiliser tube VZ.Numerical value (specific value is determined by technique) near 8.5V.VL is limited
Volt circuit guarantees that the output voltage (emitter of transistor Q1) of reference circuit is no more than 15V.Power supply stabilization circuit (1) gives institute
There are other module for power supply, reduces influence of the fluctuation of voltage on periphery power line for internal circuit；
First passage reference circuit (2) and second channel reference circuit (3) generate one with voltage change very little, temperature coefficient
Low reference voltage is supplied to first passage electric leakage signal detector (4) and second channel electric leakage signal detector (5)；
The base first passage reference circuit (2) and second channel reference circuit (3) please refer to Fig. 3: resistance R24 and resistance R26
Transistor Q46 constitutes current source.Transistor Q23 is separator tube, its emitter voltage exports bias voltage.Resistance R24 and electricity
The voltage value of the electric resistance partial pressure of R26 is hindered, in addition the pressure drop of transistor Q46 determines the base voltage of transistor Q23, final benchmark
Voltage subtracts a positive PN junction by the base voltage of transistor Q23.Diode Q23 is used to enhance the driving energy of bias voltage
Power.First passage reference circuit (2) is that first passage electric leakage signal detector (4) provides a current source and a benchmark electricity
Pressure.Second channel reference circuit (3) is that second channel electric leakage signal detector (5) provides a current source and a benchmark electricity
Pressure.
Latch circuit output (7) is used to detect the output signal of logic processor, and when there is high potential, latch can be locked
Determine high potential and output end control earth leakage circuit-breaker tripping.
For the latch circuit output (7) referring to Fig. 7, SC is latch inputs, transistor Q27, transistor Q35 are brilliant
Body pipe Q1, transistor Q34 constitute Low ESR amplifying circuit, and resistance R1, transistor Q4, transistor Q3 constitute current driving circuit,
I13, I14 are adaptation load.When SC inputs high potential, Low ESR amplifying circuit can start rapidly, pass through transistor Q3, crystal
Pipe Q4 forms electric current driving.Resistance R18 is driven current through, resistance R17 is output to the output pin OS of latch.Transistor Q28,
Electric current on transistor Q29 detection resistance R18, resistance R17, when the numerical value of electric current, which reaches, opens thresholding, transistor Q28 guide
Logical, so that the electric current of resistance R17 increases rapidly, transistor Q29 is opened immediately, and the electric current for being output to OC foot increases rapidly,
The external thyristor of driving OS foot makes entire circuit enter guard mode.
Specifically, the anti-interference embodiment of leakage protection circuit:
Referring to Fig. 5, it is a kind of functional schematic of earth leakage protective device with anti-interference function.The one end resistance R1 end connects
Connect the input terminal of zero sequence transformer ZCT, the input of another termination earth leakage protective device first passage electric leakage signal detector (4)
End；The one end resistance R2 terminates another input terminal of zero sequence transformer ZCT.Another earth leakage protective device first that terminates to of resistance R2 leads to
Another input terminal of road electric leakage signal detector (4).Resistance R1, R2 and first passage electric leakage signal detector (4) input terminal
The parasitic capacitance both-end low-pass network of device, filters out high frequency electromagnetic wave signal.Therefore after increasing anti-jamming circuit, it is ensured that leakage
The normal operation in 1 channel of non-electricity protector, will not generate malfunction；The one end resistance R3 connects the input terminal of zero sequence transformer ZCT,
The input terminal of another termination earth leakage protective device comparator module 2；Another input terminal of the one end resistance R4 zero sequence transformer ZCT.Separately
One end is connected to another input terminal of earth leakage protective device comparator module 2.R2, R4 and second channel electric leakage signal detector (5)
Both-end low-pass network is constituted, high frequency electromagnetic wave signal is filtered out.Therefore after increasing anti-jamming circuit, it is ensured that earth leakage protective device 2
The normal operation in channel will not generate malfunction
Referring to Fig. 1, it is overall schematic of the invention, filtered out when high-frequency interferencing signal enters earth leakage protective device.This
Greatly simplify the application drawing of anti-jamming circuit.So that production cost more low performance is more reliable.In the present embodiment, zero sequence transformer is
It is most susceptible to the interference of high frequency electromagnetic wave signal, therefore anti-jamming circuit is mainly aiming at the height at the both ends of zero sequence transformer
Frequency electromagnetic waves signal is filtered out, and thus eliminating the need the maximum interference sources of entire circuit.And it does not influence normally to leak electricity
Defencive function.
Specifically, leakage protection circuit trims embodiment:
Leakage current test point is trimmed by first passage electric leakage signal detector (4) and second channel electric leakage signal detector
(5) implement.
Referring to Fig. 4, first passage electric leakage signal detector (4) and second channel electric leakage signal detector (5) structure phase
It together, is made of two-stage differential amplifier.Transistor Q87 and transistor Q88 constitutes first order differential pair tube, and I5 is current source
It powers to differential pair tube.It trims and is realized in the collector resistance of transistor Q87, resistance R7 is main collector bias resistance.
Shared level Four trims, and the first order is trimmed to be carried out between test point T1 and test point T2, and resistance R9 is to trim resistance value: the second level
It trims and is carried out between test point T2 and test point T3, resistance R15 is to trim resistance value；The third level trims in test point T3 and survey
It is carried out between examination T4, resistance R14 is to trim resistance；The fourth stage is trimmed to carry out between test point T4 and test point T5, resistance R11
To trim resistance；Resistance R61 is the collector resistance of transistor Q88, and resistance value is consistent with resistance R7, and transistor Q94 provides one
A diode biasing, I7 are to load to the adaptation of pipe.Second level difference amplifier is by transistor Q104, transistor Q42 and biasing
It constitutes.I8 provides electric current to second level differential pair tube for current source, and I10 is to load to the adaptation of pipe.
The mode that trims of leakage current test point uses but is not limited to diode and trims.The substantive characteristics trimmed is not being departed from
In the case of, trim to realize with structure in other forms.
Specifically, the embodiment of binary channels earth leakage protective device
Referring to Fig. 1, power supply stabilization circuit (1) is powered to entire circuit, first passage detection of electrical leakage is by first passage benchmark
Circuit (2) and first passage electric leakage signal detector (4) composition, first passage reference circuit (2) give first passage electric leakage signal
Detector (4) provides a current source and a reference voltage；Second channel detection of electrical leakage by second channel reference circuit (3) and
Second channel electric leakage signal detector (5) composition；The embodiment of Dual channel detection: when occurring leakage current in route, pass through
SCT generates an electrical leakage voltage in the end VR1 and IN1 and the end VR2 and IN2.Electrical leakage voltage enters first by immunity module
Channel electric leakage signal detector (4) and second channel electric leakage signal detector (5), when electrical leakage voltage reaches first passage electric leakage letter
The turnover door of number detector (4) and second channel electric leakage signal detector (5) is prescribed a time limit, and comparator exports low potential.First passage
The output of electric leakage signal detector (4) and the output of second channel electric leakage signal detector (5) are all input to five logic function of figure
Module.Occurs leakage current all the way when first passage electric leakage signal detector (4) and second channel electric leakage signal detector (5) have
When, logic module just exports high potential to the input terminal of latch, then drives the current start module of latch and finally promotees
So that latch output switching activity is driven external thyristor, entire circuit is made to enter guard mode.Two channel bias currents and benchmark
Voltage is all that independent base modules 1 and base modules 2 provide.First passage electric leakage signal detector (4) and second channel leakage
The output of electrical signal detection device (5) is all input to Fig. 6 logic module circuit, and two-way detection of electrical leakage comparator has just been completely secured in this
The independence and consistency of work, the detection of electrical leakage for allowing for Live line Zero line in this way are not influenced completely by ground wire detection of electrical leakage,
To improve the safety of system.
Every technical staff's notice: of the invention although the present invention is described according to above-mentioned specific embodiment
Invention thought be not limited in the invention, any repacking with inventive concept will all be included in this patent protection of the patent right
In range.
Claims (8)
1. a kind of anti-interference overriding binary channels earth leakage protective device, it is characterised in that: including power supply stabilization circuit (1), first
Channel reference circuit (2), first passage electric leakage signal detector (4), second channel reference circuit (3), second channel electric leakage letter
Number detector (5), immunity module circuit, logic processor (6) and latch circuit output (7),
The power supply stabilization circuit (1) is the first passage reference circuit (2), first passage electric leakage signal detector (4), the
Two channel reference circuits (3), second channel electric leakage signal detector (5) and latch circuit output (7) provide operating voltage,
The positive input of the first output end connection first passage electric leakage signal detector (4) of the first passage reference circuit (2)
End, second output terminal connect the bias current end of first passage electric leakage signal detector (4), first passage electric leakage signal detector
(4) negative input inputs detection of electrical leakage signal, and the positive input terminal input first of first passage electric leakage signal detector (4) is logical
The negative input of the reference voltage that road reference circuit (2) provides, second channel electric leakage signal detector (5) inputs detection of electrical leakage
Signal, the reference voltage that anode input first passage reference circuit (2) of second channel electric leakage signal detector (5) provides,
The output end of first input end connection first passage electric leakage signal detector (4) of the logic processor (6), second is defeated
Enter the output end of end connection second channel electric leakage signal detector (5), the output end of logic processor (6) is connected to latch output
The input terminal of circuit (7).
2. anti-interference overriding binary channels earth leakage protective device according to claim 1, it is characterised in that: described first is logical
Road reference circuit (2) and second channel reference circuit (3) are using the output of the reference voltage of identical circuit structure and same numerical value.
3. anti-interference overriding binary channels earth leakage protective device according to claim 1, it is characterised in that: described first is logical
Road electric leakage signal detector (4) is identical as second channel electric leakage signal detector (3) structure, by two-stage differential amplifier structure
At transistor Q87 and transistor Q88 constitute first order differential pair tube, and transistor Q104 and transistor Q42 constitute second level difference
To pipe, current source I5 is the power supply of first order differential pair tube, and current source I8 is the power supply of second level differential pair tube, and resistance R7 is main collection
Electrode bias resistance；Resistance R61 is the collector resistance of transistor Q88, and resistance value is consistent with resistance R7.
4. anti-interference overriding binary channels circuit for electric leakage protector according to claim 3, it is characterised in that: described
It is equipped with and is trimmed a little inside one channel electric leakage signal detector (4) and second channel leakage indicator (5), trimmed a little pair by described
Leakage current test point is configured.
5. anti-interference overriding binary channels earth leakage protective device according to claim 4, it is characterised in that: described to trim a little
Quantity is four.
6. anti-interference overriding binary channels earth leakage protective device according to claim 5, it is characterised in that:
Burning tune ratio is 1:2:4.
7. anti-interference overriding binary channels earth leakage protective device according to claim 5, it is characterised in that:
The a little shared level Four that trims trims, and the first order is trimmed to be carried out between test point T1 and test point T2, and resistance R9 is to repair
Adjust resistance value: the second level is trimmed to carry out between test point T2 and test point T3, and resistance R15 is to trim resistance value；The third level is repaired
It adjusts and is carried out between test point T3 and test T4, resistance R14 is to trim resistance；The fourth stage is trimmed in test point T4 and test point T5
Between carry out, resistance R11 be trim resistance.
8. anti-interference overriding binary channels earth leakage protective device according to claim 1, it is characterised in that: described anti-interference
In modular circuit, the one end first resistor R1 connects the input terminal of zero sequence transformer ZCT, another termination earth leakage protective device first passage
The input terminal of electric leakage signal detector (4)；Second resistance R2 mono- terminates another input terminal of zero sequence transformer ZCT, second resistance
Another another input terminal for terminating to earth leakage protective device first passage electric leakage signal detector (4) of R2,3rd resistor R3 mono-
End connects the input terminal of zero sequence transformer ZCT, the input terminal of another termination earth leakage protective device comparator module 2；4th resistance
Another input terminal of the one end R4 zero sequence transformer ZCT, another another input for terminating to earth leakage protective device comparator module 2
End.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811030133.8A CN109193560B (en) | 2018-09-05 | 2018-09-05 | Anti-interference overriding binary channels earth leakage protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030133.8A CN109193560B (en) | 2018-09-05 | 2018-09-05 | Anti-interference overriding binary channels earth leakage protective device |
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| CN109193560A true CN109193560A (en) | 2019-01-11 |
| CN109193560B CN109193560B (en) | 2019-09-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115588964A (en) * | 2022-12-12 | 2023-01-10 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
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| CN1058489A (en) * | 1991-09-04 | 1992-02-05 | 黄厚振 | The selective high-voltage leakage protection using dynamic voltage comparison method |
| CN1430315A (en) * | 2001-12-29 | 2003-07-16 | 河村电器产业株式会社 | Electric leakage breaker capable of resisting interference from electromagnetic wave |
| CN101534000A (en) * | 2009-04-24 | 2009-09-16 | 北京Abb低压电器有限公司 | Leakage protector |
| US20120236448A1 (en) * | 2011-03-16 | 2012-09-20 | Kabushiki Kaisha Toshiba | Semiconductor integrated circuit |
| CN204992529U (en) * | 2015-08-03 | 2016-01-20 | 刘圣平 | Unusual effectual earth -leakage protector |
| CN107154612A (en) * | 2017-07-18 | 2017-09-12 | 余姚市嘉荣电子电器有限公司 | A kind of dual input circuit for electric leakage protector |
| CN107658846A (en) * | 2017-11-09 | 2018-02-02 | 无锡华润矽科微电子有限公司 | A type low-voltage leakage protector circuits |
| CN108462149A (en) * | 2018-04-07 | 2018-08-28 | 田自娟 | The leak current fault monitoring chip of earth leakage protective device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058489A (en) * | 1991-09-04 | 1992-02-05 | 黄厚振 | The selective high-voltage leakage protection using dynamic voltage comparison method |
| CN1430315A (en) * | 2001-12-29 | 2003-07-16 | 河村电器产业株式会社 | Electric leakage breaker capable of resisting interference from electromagnetic wave |
| CN101534000A (en) * | 2009-04-24 | 2009-09-16 | 北京Abb低压电器有限公司 | Leakage protector |
| US20120236448A1 (en) * | 2011-03-16 | 2012-09-20 | Kabushiki Kaisha Toshiba | Semiconductor integrated circuit |
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| CN107154612A (en) * | 2017-07-18 | 2017-09-12 | 余姚市嘉荣电子电器有限公司 | A kind of dual input circuit for electric leakage protector |
| CN107658846A (en) * | 2017-11-09 | 2018-02-02 | 无锡华润矽科微电子有限公司 | A type low-voltage leakage protector circuits |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115588964A (en) * | 2022-12-12 | 2023-01-10 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
| CN115588964B (en) * | 2022-12-12 | 2023-03-03 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
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|---|---|
| CN109193560B (en) | 2019-09-10 |
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