CN105676049A - Circuit for detecting poor grounding - Google Patents
Circuit for detecting poor grounding Download PDFInfo
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- CN105676049A CN105676049A CN201610032757.8A CN201610032757A CN105676049A CN 105676049 A CN105676049 A CN 105676049A CN 201610032757 A CN201610032757 A CN 201610032757A CN 105676049 A CN105676049 A CN 105676049A
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- circuit
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- 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
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a circuit for detecting poor grounding, and belongs to the field of power supply safety. The circuit for detecting poor grounding comprises a detection circuit, a rectification and filtering circuit and a comparator. The first end of the detection circuit is connected with an AC power supply, the second end of the detection circuit is connected with a ground wire detecting line, the third end of the detection circuit is connected with the rectification and filtering circuit, and the fourth end of the detection circuit is connected with a power supply casing; and the detection circuit is used detect whether poor grounding occurs. One end of the rectification and filtering circuit is connected with the detection circuit, and the other end of the rectification and filtering circuit is connected with the comparator; and the rectification and filtering circuit is used to rectify and filter the voltage input by the detection circuit. The comparator determines whether poor grounding occurs according to the voltage output by the rectification and filtering circuit.
Description
Technical field
The present invention relates to power safety field, particularly relate to a kind of circuit detecting imperfect earth.
Background technology
The design of AC power supply must meet the principle do not hurted sb.'s feelings. Therefore, ensure that ground connection well becomes the emphasis of AC power supply design.
Current AC power supply is all power machine shell and external system are connected by a ground wire, if ground wire is missed or loose contact, power machine shell will be caused to there is the charged danger hurted sb.'s feelings.
Summary of the invention
It is an object of the invention to provide a kind of circuit detecting imperfect earth, in order to detect AC power supply imperfect earth.
It is an object of the invention to be achieved through the following technical solutions:
First aspect, a kind of circuit detecting imperfect earth, comprises detection circuit, current rectifying and wave filtering circuit and comparer, wherein:
Described detection circuit, first end is connected with AC power, and the 2nd end is connected with ground wire detection line, and the 3rd end is connected with current rectifying and wave filtering circuit, and the 4th end is connected with power machine shell, for whether detection imperfect earth occurs;
Described current rectifying and wave filtering circuit, one end is connected with described detection circuit, and the other end is connected with described comparer, carries out rectifying and wave-filtering for the voltage inputted for described detection circuit;
Described comparer, the voltage for exporting according to described current rectifying and wave filtering circuit judges whether imperfect earth.
In conjunction with first aspect, also comprise:
Digital signal processor DSP, is connected with described comparer, for the level exported according to described comparer, imperfect earth is carried out alarm.
In conjunction with first aspect, described detection circuit, comprises detection resistance and two component compressive resistances, and every component compressive resistance, comprises at least two points of compressive resistances, and the first component compressive resistance is connected with described AC power, and the 2nd component compressive resistance is connected with described detection resistance;
If described AC power ground connection is good, then the electric current of described AC power flows through described first component compressive resistance, without described detection resistance, it is linked into external system from described ground wire detection line, then it is linked into described power machine shell by described external system by described ground wire; Described current rectifying and wave filtering circuit does not have voltage to input; Described comparer exports lower level; The lower level display that described DSP exports according to described comparer is described normally ground wire grounded; Or
If described AC power imperfect earth, then the electric current of described AC power flows through described first component compressive resistance, described detection resistance and described 2nd component compressive resistance and is linked into described power machine shell; Described current rectifying and wave filtering circuit carries out rectifying and wave-filtering for the voltage at described detection resistance two ends, and exports described comparer to; Described comparer compares according to the input voltage of input terminus and the votage reference preset, it is determined that when exporting high level, and the high level display that described DSP exports according to described comparer is described ground wire grounded bad.
In conjunction with first aspect, described AC power ground connection well refers to that described ground wire and described ground wire detection line all contact well, and described AC power imperfect earth refers to described ground wire and/or described ground wire detection line loose contact.
In conjunction with first aspect, described current rectifying and wave filtering circuit, comprises diode, rectification resistance and rectification electric capacity, wherein:
Described diode, one end is connected with the input terminus of described detection resistance, the other end is connected with one end of described rectification resistance, and the other end of described rectification resistance is connected with one end of described rectification electric capacity, and the other end of described rectification electric capacity is connected with the output terminal of described detection resistance.
In conjunction with first aspect, described current rectifying and wave filtering circuit, also comprises clamping diode, and described clamping diode and described rectification Capacitance parallel connection, for the protection of described comparer.
The useful effect of the embodiment of the present invention is: the circuit of detection imperfect earth, at least comprise detection circuit, current rectifying and wave filtering circuit and comparer, wherein, detection circuit, first end is connected with AC power, and the 2nd end is connected with ground wire detection line, and the 3rd end is connected with current rectifying and wave filtering circuit, 4th end is connected with power machine shell, for whether detection imperfect earth occurs; Ground wire grounded normal time, detection circuit in detection resistance two ends do not have voltage to export, outward current by ground wire detection line access power machine shell, therefore, comparer output lower level. When ground wire imperfect earth, detection resistance two ends have voltage to export, and outward current directly accesses power machine shell, and therefore, comparer exports high level. Current rectifying and wave filtering circuit, one end is connected with detection circuit, and the other end is connected with comparer, for carrying out rectifying and wave-filtering for the voltage of detection circuit input; Comparer, the voltage for exporting according to current rectifying and wave filtering circuit judges whether imperfect earth. Therefore, by increasing a ground wire detection line, ensureing that the ground connection of AC power supply is good by " double earth wire ", cost is lower, it is possible to reliably detect out AC power supply imperfect earth.
Accompanying drawing explanation
Fig. 1 is the structural representation of the circuit detecting imperfect earth in the embodiment of the present invention;
Fig. 2 is the structural representation detecting circuit in the embodiment of the present invention;
Electric current path figure when Fig. 3 is that in the embodiment of the present invention, ground connection is good;
Electric current path figure when Fig. 4 is imperfect earth in the embodiment of the present invention;
Fig. 5 is the structural representation of current rectifying and wave filtering circuit in the embodiment of the present invention;
Fig. 6 is the concrete structural representation of the circuit detecting imperfect earth in the embodiment of the present invention;
The electric current path figure in path 1 when Fig. 7 is that in the embodiment of the present invention, ground connection is good;
The electric current path figure in path 2 when Fig. 8 is imperfect earth in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, is not whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Consulting shown in Fig. 1, the embodiment of the present invention provides a kind of circuit detecting imperfect earth, comprises detection circuit 11, current rectifying and wave filtering circuit 12 and comparer 13, wherein:
Detection circuit 11, first end is connected with AC power 14, and the 2nd end is connected with ground wire detection line 15, and the 3rd end is connected with current rectifying and wave filtering circuit 12, and the 4th end is connected with power machine shell 16, for whether detection imperfect earth occurs;
Current rectifying and wave filtering circuit 12, one end is connected with detection circuit 11, and the other end is connected with comparer 13, carries out rectifying and wave-filtering for the voltage inputted for detection circuit 11;
Comparer 13, the voltage for exporting according to current rectifying and wave filtering circuit 12 judges whether imperfect earth.
In addition, digital signal processor DSP (does not draw in Fig. 1), is connected with comparer 13, for the level exported according to comparer 13, imperfect earth is carried out alarm.
Concrete, consult shown in Fig. 2, detection circuit 11, comprise detection resistance RXWith two component compressive resistances, every component compressive resistance, comprises at least two points of compressive resistances, and the first component compressive resistance is connected with AC power 14, the 2nd component compressive resistance and detection resistance RXBeing connected, resistance quantity here is not specifically limited, and can choose according to practical situation.
For Fig. 2, detection circuit comprises: detection resistance RX
First component compressive resistance: R11, R12 and R13;
2nd component compressive resistance: R21 and R22.
Consulting described in Fig. 3, if AC power ground connection is good, then the electric current of AC power 14 flows through the first component compressive resistance, without detection resistance, is linked into external system from ground wire detection line 15, then is linked into power machine shell 16 by external system by ground wire 17;
Concrete, when exchanging input L voltage higher than N voltage, electric current path is L → R12 → R13 → ground wire detection line 15 → external system, 18 → ground wire, 17 → power machine shell 16. Or, when exchanging input N voltage higher than L voltage, electric current path is N → R11 → R13 → ground wire detection line 15 → external system, 18 → ground wire, 17 → power machine shell 16.
Therefore, detection resistance two ends do not have pressure drop, and current rectifying and wave filtering circuit 12 does not have voltage to input, and comparer exports lower level, and the lower level display that DSP exports according to comparer is normally ground wire grounded.
Consulting shown in Fig. 4, if AC power imperfect earth, then the electric current of AC power 14 flows through the first component compressive resistance, detection resistance and the 2nd component compressive resistance and is linked into power machine shell 16.
Concrete, when exchanging input L voltage higher than N voltage, electric current path is L → R12 → R13 → R21 → detection resistance RX→ R22 → power machine shell 16. Or, when exchanging input N voltage higher than L voltage, electric current path is N → R11 → R13 → R21 → detection resistance RX→ R22 → power machine shell 16.
Therefore, current rectifying and wave filtering circuit 12 carries out rectifying and wave-filtering for the voltage at detection resistance two ends, and exports comparer 13 to; Comparer 13 compares according to the input voltage of input terminus and the votage reference preset, it is determined that when exporting high level, the high level display ground wire imperfect earth that DSP exports according to comparer 13.
Current rectifying and wave filtering circuit 12, comprises diode, rectification resistance and rectification electric capacity. Here number of diodes, rectification resistance quantity and rectification electric capacity quantity can adjust according to practical situation, are not construed as limiting.
Consult shown in Fig. 5, in current rectifying and wave filtering circuit 12, diode D1, one end is connected with the input terminus of detection resistance Rx, the other end is connected with one end of rectification resistance Rs, the other end of rectification resistance Rs is connected with one end of rectification electric capacity Cs, and the other end of rectification electric capacity Cs is connected with the output terminal of detection resistance Rs. Current rectifying and wave filtering circuit is mainly used in preventing the interference of voltage of alternating current from causing comparer flase operation.
In addition, current rectifying and wave filtering circuit 12, also comprises clamping diode D2, and clamping diode D2 is in parallel with rectification electric capacity Cs, for the protection of comparer 13.By increasing clamping diode D2, to prevent exchange input continues to improve, cause the Vin+ voltage of comparer to continue to raise, cause comparer amplifier to be damaged.
Embodiment 1:
Consult shown in Fig. 6, it is 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 stabilizing tube D1 is 5.6V, and comparator reference voltage Vin-is 1V, and original edge voltage PRI is 12V. Here the resistance sum in detection circuit and the capacitive reactance ratio of C1 and C2 are 0.25～1.
Consulting shown in Fig. 7, when AC power ground connection is good, as shown in path 1, when exchanging input L voltage higher than N voltage, electric current path is L → R1 → R2 → PE2 → LINE2 → LINE1 → PE1 power machine shell. Or, when exchanging input N voltage higher than L voltage, electric current path is N → R6 → R2 → PE2 → LINE2 → LINE1 → PE1 power machine shell.
Therefore, detection resistance two ends do not have pressure drop, and current rectifying and wave filtering circuit does not have voltage to input, and comparer U1Vin+ is 0V, Vin-is 1V benchmark, and amplifier U1 exports lower level, and the lower level display that DSP exports according to comparer is normally ground wire grounded.
Consulting shown in Fig. 8, when any imperfect earth of LINE1 and LINE2, then path 1 disconnects, and electric current walks path 2, and when exchanging input L voltage higher than N voltage, electric current path is L → R1 → R2 → R3 → R4 → R5 → PE1 power machine shell. Or, when exchanging input N voltage higher than L voltage, electric current path is N → R6 → R2 → R3 → R4 → R5 → PE1 power machine shell.
Therefore, electric current has flow through R4, and when the input voltage of R4 is 90V, the Vin+ of amplifier U1 is higher than Vin-votage reference, and now amplifier exports high level, reports DSP imperfect earth. Continuing the lasting rising of rising amplifier Vin+ voltage for preventing exchange input causes amplifier to be damaged, it is thus desirable to limit Vin+ voltage by voltage stabilizing tube D1.
In sum, the present invention is supplied to a kind of circuit detecting imperfect earth, at least comprise detection circuit, current rectifying and wave filtering circuit and comparer, wherein, detection circuit, first end is connected with AC power, 2nd end is connected with ground wire detection line, 3rd end is connected with current rectifying and wave filtering circuit, and the 4th end is connected with power machine shell, for whether detection imperfect earth occurs; Ground wire grounded normal time, detection circuit in detection resistance two ends do not have voltage to export, outward current by ground wire detection line access power machine shell, therefore, comparer output lower level. When ground wire imperfect earth, detection resistance two ends have voltage to export, and outward current directly accesses power machine shell, and therefore, comparer exports high level. Current rectifying and wave filtering circuit, one end is connected with detection circuit, and the other end is connected with comparer, for carrying out rectifying and wave-filtering for the voltage of detection circuit input; Comparer, the voltage for exporting according to current rectifying and wave filtering circuit judges whether imperfect earth. Therefore, by increasing a ground wire detection line, ensureing that the ground connection of AC power supply is good by " double earth wire ", cost is lower, it is possible to reliably detect out AC power supply imperfect earth.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program. Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect. And, the present invention can adopt the form at one or more upper computer program implemented of computer-usable storage medium (including but not limited to multiple head unit, CD-ROM, optical memory etc.) wherein including computer usable program code.
The present invention is that schema and/or skeleton diagram with reference to method according to embodiments of the present invention, equipment (system) and computer program describe. Should understand can by the combination of the flow process in each flow process in computer program instructions flowchart and/or skeleton diagram and/or square frame and schema and/or skeleton diagram and/or square frame. These computer program instructions can be provided to the treater of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine so that the instruction performed by the treater of computer or other programmable data processing device is produced for realizing the device of function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
These computer program instructions also can be stored in and can guide in computer-readable memory that computer or other programmable data processing device work in a specific way, making the instruction that is stored in this computer-readable memory produce the manufacture comprising instruction device, this instruction device realizes the function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform a series of operation steps to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for realizing the step of the function specified in schema flow process or multiple flow process and/or skeleton diagram square frame or multiple square frame.
Although having described the preferred embodiments of the present invention, but those skilled in the art once the substantially creative concept of cicada, then these embodiments can be made other change and amendment. Therefore, it is intended that the appended claims shall be construed comprise preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the embodiment of the present invention can be carried out various change and modification and not depart from the spirit and scope of the embodiment of the present invention by the technician of this area. Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.
Claims (6)
1. one kind is detected the circuit of imperfect earth, it is characterised in that, comprise detection circuit, current rectifying and wave filtering circuit and comparer, wherein:
Described detection circuit, first end is connected with AC power, and the 2nd end is connected with ground wire detection line, and the 3rd end is connected with current rectifying and wave filtering circuit, and the 4th end is connected with power machine shell, for whether detection imperfect earth occurs;
Described current rectifying and wave filtering circuit, one end is connected with described detection circuit, and the other end is connected with described comparer, carries out rectifying and wave-filtering for the voltage inputted for described detection circuit;
Described comparer, the voltage for exporting according to described current rectifying and wave filtering circuit judges whether imperfect earth.
2. circuit as claimed in claim 1, it is characterised in that, also comprise:
Digital signal processor DSP, is connected with described comparer, for the level exported according to described comparer, imperfect earth is carried out alarm.
3. circuit as claimed in claim 2, it is characterised in that, described detection circuit, comprising detection resistance and two component compressive resistances, every component compressive resistance, comprises at least two points of compressive resistances, first component compressive resistance is connected with described AC power, and the 2nd component compressive resistance is connected with described detection resistance;
If described AC power ground connection is good, then the electric current of described AC power flows through described first component compressive resistance, without described detection resistance, it is linked into external system from described ground wire detection line, then it is linked into described power machine shell by described external system by described ground wire; Described current rectifying and wave filtering circuit does not have voltage to input; Described comparer exports lower level; The lower level display that described DSP exports according to described comparer is described normally ground wire grounded; Or
If described AC power imperfect earth, then the electric current of described AC power flows through described first component compressive resistance, described detection resistance and described 2nd component compressive resistance and is linked into described power machine shell; Described current rectifying and wave filtering circuit carries out rectifying and wave-filtering for the voltage at described detection resistance two ends, and exports described comparer to; Described comparer compares according to the input voltage of input terminus and the votage reference preset, it is determined that when exporting high level, and the high level display that described DSP exports according to described comparer is described ground wire grounded bad.
4. circuit as claimed in claim 3, it is characterised in that, described AC power ground connection well refers to that described ground wire and described ground wire detection line all contact well, and described AC power imperfect earth refers to described ground wire and/or described ground wire detection line loose contact.
5. circuit as described in item as arbitrary in claim 1-3, it is characterised in that, described current rectifying and wave filtering circuit, comprises diode, rectification resistance and rectification electric capacity, wherein:
Described diode, one end is connected with the input terminus of described detection resistance, the other end is connected with one end of described rectification resistance, and the other end of described rectification resistance is connected with one end of described rectification electric capacity, and the other end of described rectification electric capacity is connected with the output terminal of described detection resistance.
6. circuit as claimed in claim 5, it is characterised in that, described current rectifying and wave filtering circuit, also comprises clamping diode, and described clamping diode and described rectification Capacitance parallel connection, for the protection of described comparer.
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 |
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| 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 true CN105676049A (en) | 2016-06-15 |
| CN105676049B CN105676049B (en) | 2019-03-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| 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 |
| WO2021027832A1 (en) * | 2019-08-12 | 2021-02-18 | 中兴通讯股份有限公司 | Alarm apparatus and system for poor grounding |
| CN112881940A (en) * | 2019-11-14 | 2021-06-01 | 华为技术有限公司 | Grounding state detection circuit, electrical system and grounding state detection method thereof |
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| CN102928730A (en) * | 2012-10-31 | 2013-02-13 | 华东光电集成器件研究所 | Grounding 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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| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| 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 |
| WO2021027832A1 (en) * | 2019-08-12 | 2021-02-18 | 中兴通讯股份有限公司 | Alarm apparatus and system for poor grounding |
| CN112881940A (en) * | 2019-11-14 | 2021-06-01 | 华为技术有限公司 | Grounding state detection circuit, electrical system and grounding state detection method thereof |
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| Publication number | Publication date |
|---|---|
| CN105676049B (en) | 2019-03-08 |
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Effective date of registration: 20211103 Address after: 518043 No. 01, 39th floor, building a, antuoshan headquarters building, No. 33, antuoshan Sixth Road, Xiang'an community, Xiangmihu street, Futian District, Shenzhen, Guangdong Province Patentee after: Huawei Digital Energy Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |