CN105676049B - A kind of circuit detecting imperfect earth - Google Patents
A kind of circuit detecting imperfect earth Download PDFInfo
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- CN105676049B CN105676049B CN201610032757.8A CN201610032757A CN105676049B CN 105676049 B CN105676049 B CN 105676049B CN 201610032757 A CN201610032757 A CN 201610032757A CN 105676049 B CN105676049 B CN 105676049B
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- circuit
- comparator
- resistance
- detection
- ground wire
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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
Abstract
The present invention relates to power safety fields, more particularly to a kind of circuit for detecting imperfect earth, to detect imperfect earth, the circuit includes detection circuit, current rectifying and wave filtering circuit and comparator, in which: detection circuit, first end are connected with AC power source, second end is connected with ground wire detection line, third end is connected with current rectifying and wave filtering circuit, and the 4th end and power machine shell phase connect, for detecting whether there is imperfect earth；Current rectifying and wave filtering circuit, one end are connected with detection circuit, and the other end is connected with comparator, for carrying out rectifying and wave-filtering for the voltage of detection circuit input；Comparator, the voltage for being exported according to current rectifying and wave filtering circuit judge whether that imperfect earth occurs.
Description
Technical field
The present invention relates to power safety field more particularly to a kind of circuits for detecting imperfect earth.
Background technique
AC power supplies design must satisfy inoffensive principle.Thus it is guaranteed that the emphasis that ground connection is well designed as AC power supplies.
Current AC power supplies is all to be connected power supply casing and external system by a ground wire, if ground wire is missed
Or poor contact, it will the danger for causing power supply casing to be hurted sb.'s feelings in the presence of electrification.
Summary of the invention
The object of the present invention is to provide a kind of circuits for detecting imperfect earth, to detect AC power supplies imperfect earth.
The purpose of the present invention is what is be achieved through the following technical solutions:
In a first aspect, a kind of circuit for detecting imperfect earth, including detection circuit, current rectifying and wave filtering circuit and comparator,
In:
The detection circuit, first end are connected with AC power source, and second end is connected with ground wire detection line, third end and rectification
Filter circuit is connected, and the 4th end and power machine shell phase connect, for detecting whether there is imperfect earth；
The current rectifying and wave filtering circuit, one end are connected with the detection circuit, and the other end is connected with the comparator, are used for needle
Rectifying and wave-filtering is carried out to the voltage of detection circuit input；
The comparator, the voltage for being exported according to the current rectifying and wave filtering circuit judge whether that imperfect earth occurs.
With reference to first aspect, further includes:
Digital signal processor DSP is connected with the comparator, and the level for being exported according to the comparator is to ground connection
It is bad to be alerted.
With reference to first aspect, the detection circuit, including detection resistance and two groups of divider resistances, every group of divider resistance, packet
Containing at least two divider resistances, first group of divider resistance is connected with the AC power source, second group of divider resistance and the detection
Resistance is connected；
If the AC power source ground connection is good, the electric current of the AC power source flows through first group of divider resistance, no
By the detection resistance, it is linked into external system from the ground wire detection line, then the ground wire is passed through by the external system
It is linked into the power supply casing；The current rectifying and wave filtering circuit does not have voltage input；The comparator exports low level；The DSP
It is shown according to the low level that the comparator exports described ground wire grounded normal；Or
If the AC power source imperfect earth, the electric current of the AC power source flows through first group of divider resistance, institute
It states detection resistance and second group of divider resistance is linked into the power supply casing；The current rectifying and wave filtering circuit is directed to the detection
The voltage at resistance both ends carries out rectifying and wave-filtering, and exports to the comparator；The comparator is according to the input voltage of input terminal
It is compared with preset reference voltage, when determining output high level, the DSP is aobvious according to the high level that the comparator exports
Show described ground wire grounded bad.
With reference to first aspect, it is good well to refer to that the ground wire and the ground wire detection line contact for the AC power source ground connection
Good, the AC power source imperfect earth refers to the ground wire and/or the ground wire detection line poor contact.
With reference to first aspect, the current rectifying and wave filtering circuit, including diode, dead resistance and commutation capacitor, in which:
The diode, one end are connected with the input terminal of the detection resistance, one end of the other end and the dead resistance
Be connected, the other end of the dead resistance is connected with one end of the commutation capacitor, the other end of the commutation capacitor with it is described
The output end of detection resistance is connected.
With reference to first aspect, the current rectifying and wave filtering circuit further includes clamp diode, the clamp diode with it is described whole
Galvanic electricity holds parallel connection, for protecting the comparator.
The circuit for having the beneficial effect that detection imperfect earth of the embodiment of the present invention, includes at least detection circuit, rectifying and wave-filtering
Circuit and comparator, wherein detection circuit, first end are connected with AC power source, and second end is connected with ground wire detection line, third end
It is connected with current rectifying and wave filtering circuit, the 4th end and power machine shell phase connect, for detecting whether there is imperfect earth；It is ground wire grounded just
Chang Shi, the detection resistance both ends in detection circuit do not have voltage output, and output electric current accesses power supply casing by ground wire detection line,
Therefore, comparator exports low level.When ground wire imperfect earth, there is voltage output at detection resistance both ends, and output electric current directly connects
Enter power supply casing, therefore, comparator exports high level.Current rectifying and wave filtering circuit, one end are connected with detection circuit, and the other end is compared with
Device is connected, for carrying out rectifying and wave-filtering for the voltage of detection circuit input；Comparator, for being exported according to current rectifying and wave filtering circuit
Voltage judge whether occur imperfect earth.Therefore, by increasing a ground wire detection line, guarantee AC electricity by " double earth wire "
The ground connection in source is good, and cost is relatively low, can reliably detect out AC power supplies imperfect earth.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the circuit of imperfect earth is detected in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of detection circuit in the embodiment of the present invention；
Fig. 3 is current path figure when being grounded good in the embodiment of the present invention；
Current path figure when Fig. 4 is imperfect earth in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of current rectifying and wave filtering circuit in the embodiment of the present invention；
Fig. 6 is the concrete structure schematic diagram that the circuit of imperfect earth is detected in the embodiment of the present invention；
Fig. 7 is the current path figure in path 1 when being grounded good in the embodiment of the present invention；
The current path figure in path 2 when Fig. 8 is imperfect earth in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, is not whole embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in fig.1, the embodiment of the present invention provides a kind of circuit for detecting imperfect earth, including detection circuit 11, whole
Flow filter circuit 12 and comparator 13, in which:
Detection circuit 11, first end are connected with AC power source 14, and second end is connected with ground wire detection line 15, third end with it is whole
It flows filter circuit 12 to be connected, the 4th end is connected with power supply casing 16, for detecting whether there is imperfect earth；
Current rectifying and wave filtering circuit 12, one end are connected with detection circuit 11, and the other end is connected with comparator 13, for for detection
The voltage that circuit 11 inputs carries out rectifying and wave-filtering；
Comparator 13, the voltage for being exported according to current rectifying and wave filtering circuit 12 judge whether that imperfect earth occurs.
In addition, digital signal processor DSP (being not drawn into Fig. 1), is connected with comparator 13, for defeated according to comparator 13
Level out alerts imperfect earth.
Specifically, as shown in fig.2, detection circuit 11, including detection resistance RXWith two groups of divider resistances, every component piezoelectricity
Resistance, contains at least two divider resistance, and first group of divider resistance is connected with AC power source 14, second group of divider resistance and detection electricity
Hinder RXIt is connected, resistance quantity here is not specifically limited, and can be chosen according to the actual situation.
By taking Fig. 2 as an example, detection circuit includes: detection resistance RX
First group of divider resistance: R11, R12 and R13；
Second group of divider resistance: R21 and R22.
Refering to described in Fig. 3, if AC power source ground connection is good, the electric current of AC power source 14 flows through first group of divider resistance,
Without detection resistance, it is linked into external system from ground wire detection line 15, then power supply is linked by ground wire 17 by external system
Casing 16；
Specifically, current path is L → R12 → R13 → ground wire detection line 15 when exchange input L voltage is higher than N voltage
→ external system 18 → ground wire, 17 → power supply casing 16.Alternatively, when exchange input N voltage is higher than L voltage, current path N
→ R11 → R13 → ground wire detection line 15 → external system, 18 → ground wire, 17 → power supply casing 16.
Therefore, detection resistance both ends do not have pressure drop, and current rectifying and wave filtering circuit 12 does not have voltage input, and comparator exports low electricity
Flat, DSP shows ground wire grounded normal according to the low level that comparator exports.
As shown in fig.4, if AC power source imperfect earth, the electric current of AC power source 14 flow through first group of divider resistance,
Detection resistance and second group of divider resistance are linked into power supply casing 16.
Specifically, current path is L → R12 → R13 → R21 → detection electricity when exchange input L voltage is higher than N voltage
Hinder RX→ R22 → power supply casing 16.Alternatively, when exchange input N voltage be higher than L voltage when, current path be N → R11 → R13 →
R21 → detection resistance RX→ R22 → power supply casing 16.
Therefore, current rectifying and wave filtering circuit 12 carries out rectifying and wave-filtering for the voltage at detection resistance both ends, and exports to comparator
13；Comparator 13 is compared according to the input voltage of input terminal with preset reference voltage, when determining output high level, DSP
Ground wire imperfect earth is shown according to the high level that comparator 13 exports.
Current rectifying and wave filtering circuit 12, including diode, dead resistance and commutation capacitor.Here number of diodes, rectified current
Resistance quantity and commutation capacitor quantity can be adjusted according to the actual situation, and be not construed as limiting.
As shown in fig.5, diode D1, one end is connected with the input terminal of detection resistance Rx in current rectifying and wave filtering circuit 12,
The other end is connected with one end of dead resistance Rs, and the other end of dead resistance Rs is connected with one end of commutation capacitor Cs, rectified current
The other end for holding Cs is connected with the output end of detection resistance Rs.Current rectifying and wave filtering circuit is mainly used for preventing the interference of alternating voltage from leading
Cause comparator malfunction.
In addition, current rectifying and wave filtering circuit 12, further includes clamp diode D2, clamp diode D2 is in parallel with commutation capacitor Cs,
For protecting comparator 13.By increasing clamp diode D2, to prevent exchange input constantly improve, the Vin+ of comparator is caused
Voltage persistently increases, and comparator amplifier is caused to be damaged.
Embodiment 1:
As shown in fig.6, being the preferred embodiment of the present invention, wherein C1=C2=4.7nF, R1=R2=R3=R5
=R6=1M Ω, R4=500k Ω, R7=1 Ω, C3=68nF, voltage-stabiliser tube D1 are 5.6V, and comparator reference voltage Vin- is 1V,
Original edge voltage PRI is 12V.Here the capacitive reactance ratio of the sum of resistance in detection circuit and C1 and C2 are 0.25~1.
As shown in fig.7, when AC power source ground connection is good, as shown in path 1, when exchange input L voltage is higher than N voltage
When, current path is L → R1 → R2 → PE2 → LINE2 → LINE1 → PE1 power supply casing.Alternatively, when exchange input N voltage is high
When L voltage, current path is N → R6 → R2 → PE2 → LINE2 → LINE1 → PE1 power supply casing.
Therefore, detection resistance both ends do not have pressure drop, and current rectifying and wave filtering circuit does not have voltage input, and comparator U1Vin+ is 0V,
Vin- is 1V benchmark, and amplifier U1 exports low level, and DSP shows ground wire grounded normal according to the low level that comparator exports.
As shown in fig.8, then path 1 disconnects as LINE1 and any one imperfect earth of LINE2, electric current walks path 2,
When exchange input L voltage is higher than N voltage, current path is L → R1 → R2 → R3 → R4 → R5 → PE1 power supply casing.Alternatively,
When exchange input N voltage is higher than L voltage, current path is N → R6 → R2 → R3 → R4 → R5 → PE1 power supply casing.
Therefore, electric current has flowed through R4, and when the input voltage of R4 is 90V, the Vin+ of amplifier U1 is higher than Vin- reference voltage,
Amplifier exports high level at this time, reports DSP imperfect earth.It is persistently increased to prevent exchange input from persistently increasing amplifier Vin+ voltage
Amplifier is caused to be damaged, it is therefore desirable to limit Vin+ voltage by voltage-stabiliser tube D1.
In conclusion the present invention is supplied to a kind of circuit for detecting imperfect earth, detection circuit, rectifying and wave-filtering are included at least
Circuit and comparator, wherein detection circuit, first end are connected with AC power source, and second end is connected with ground wire detection line, third end
It is connected with current rectifying and wave filtering circuit, the 4th end and power machine shell phase connect, for detecting whether there is imperfect earth；It is ground wire grounded just
Chang Shi, the detection resistance both ends in detection circuit do not have voltage output, and output electric current accesses power supply casing by ground wire detection line,
Therefore, comparator exports low level.When ground wire imperfect earth, there is voltage output at detection resistance both ends, and output electric current directly connects
Enter power supply casing, therefore, comparator exports high level.Current rectifying and wave filtering circuit, one end are connected with detection circuit, and the other end is compared with
Device is connected, for carrying out rectifying and wave-filtering for the voltage of detection circuit input；Comparator, for being exported according to current rectifying and wave filtering circuit
Voltage judge whether occur imperfect earth.Therefore, by increasing a ground wire detection line, guarantee AC electricity by " double earth wire "
The ground connection in source is good, and cost is relatively low, can reliably detect out AC power supplies imperfect earth.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of circuit for detecting imperfect earth, which is characterized in that including ground wire detection line, detection circuit, current rectifying and wave filtering circuit
And comparator, in which:
The detection circuit, first end are connected with AC power source, and second end is connected with the ground wire detection line, third end with it is described
Current rectifying and wave filtering circuit is connected, and the 4th end and power machine shell phase connect, for detecting whether there is imperfect earth；
Wherein, the other end of the ground wire detection line is connect with external system, and the external system passes through ground wire and the power supply
Casing connection；
The current rectifying and wave filtering circuit, one end are connected with the detection circuit, and the other end is connected with the comparator, for being directed to institute
The voltage for stating detection circuit input carries out rectifying and wave-filtering；
The comparator, the voltage for being exported according to the current rectifying and wave filtering circuit judge whether that imperfect earth occurs.
2. circuit as described in claim 1, which is characterized in that further include:
Digital signal processor DSP is connected with the comparator, and the level for being exported according to the comparator is to imperfect earth
It is alerted.
3. circuit as claimed in claim 2, which is characterized in that the detection circuit, including detection resistance and two component piezoelectricity
Resistance, every group of divider resistance contain at least two divider resistance, and first group of divider resistance is connected with the AC power source, and second group
Divider resistance is connected with the detection resistance；
If the AC power source ground connection is good, the electric current of the AC power source flows through first group of divider resistance, without
The detection resistance is linked into external system from the ground wire detection line, then is accessed by the external system by the ground wire
To the power supply casing；The current rectifying and wave filtering circuit does not have voltage input；The comparator exports low level；The DSP according to
The low level of the comparator output shows described ground wire grounded normal；Or
If the AC power source imperfect earth, the electric current of the AC power source flows through first group of divider resistance, the inspection
Measuring resistance and second group of divider resistance are linked into the power supply casing；The current rectifying and wave filtering circuit is directed to the detection resistance
The voltage at both ends carries out rectifying and wave-filtering, and exports to the comparator；The comparator is according to the input voltage of input terminal and pre-
If reference voltage be compared, when determining output high level, high level display institute that the DSP export according to the comparator
It states ground wire grounded bad.
4. circuit as claimed in claim 3, which is characterized in that AC power source ground connection well refers to the ground wire and described
Ground wire detection line contacts well, and the AC power source imperfect earth refers to the ground wire and/or ground wire detection line contact
It is bad.
5. circuit as claimed in claim 3, which is characterized in that the current rectifying and wave filtering circuit, including diode, dead resistance and
Commutation capacitor, in which:
The diode, one end are connected with the input terminal of the detection resistance, and the other end is connected with one end of the dead resistance,
The other end of the dead resistance is connected with one end of the commutation capacitor, the other end of the commutation capacitor and detection electricity
The output end of resistance is connected.
6. circuit as claimed in claim 5, which is characterized in that the current rectifying and wave filtering circuit further includes clamp diode, described
Clamp diode is in parallel with the commutation capacitor, for protecting the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610032757.8A CN105676049B (en) | 2016-01-18 | 2016-01-18 | A kind of circuit detecting imperfect earth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610032757.8A CN105676049B (en) | 2016-01-18 | 2016-01-18 | A kind of circuit detecting imperfect earth |
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| CN105676049A CN105676049A (en) | 2016-06-15 |
| CN105676049B true CN105676049B (en) | 2019-03-08 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607830B (en) * | 2017-09-13 | 2021-07-20 | 广西电网有限责任公司电力科学研究院 | Method for continuously monitoring protective grounding state of electrical equipment |
| CN109444635A (en) * | 2018-11-15 | 2019-03-08 | 珠海格力电器股份有限公司 | A kind of equipment ground real time monitoring apparatus |
| CN112394295A (en) * | 2019-08-12 | 2021-02-23 | 中兴通讯股份有限公司 | Bad ground alarm device and bad ground alarm system |
| CN112881940B (en) * | 2019-11-14 | 2022-07-26 | 华为技术有限公司 | Grounding state detection circuit, electrical system and grounding state detection method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1022069A (en) * | 1996-07-04 | 1998-01-23 | Mitsubishi Electric Corp | Glow heater device |
| CN2318639Y (en) * | 1997-10-20 | 1999-05-12 | 杨学昌 | Earth monitor for electrostatic earthed system |
| CN201072429Y (en) * | 2007-07-09 | 2008-06-11 | 虞宁生 | Earthing detection circuit |
| CN102928730B (en) * | 2012-10-31 | 2016-01-27 | 华东光电集成器件研究所 | A kind of ground detection device |
| CN203561719U (en) * | 2013-11-08 | 2014-04-23 | 联想(北京)有限公司 | Ground wire connection state detecting and alarming device, and power source |
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