CN106707032A - Ground wire resistance value detection circuit - Google Patents
Ground wire resistance value detection circuit Download PDFInfo
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- CN106707032A CN106707032A CN201710038777.0A CN201710038777A CN106707032A CN 106707032 A CN106707032 A CN 106707032A CN 201710038777 A CN201710038777 A CN 201710038777A CN 106707032 A CN106707032 A CN 106707032A
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- resistance
- circuit
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- ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention discloses a ground wire resistance value detection circuit, which comprises a ground signaling detection circuit, an amplifying circuit, a shaping circuit, a rectifier circuit, and an MCU. The ground signaling detection circuit is used for acquiring the over-the-ground signal of a phase wire. The MCU is used for reading the DC voltage value of the rectifier circuit. Each detection input end of the ground signaling detection circuit is respectively and correspondingly connected with the phase wire, a zero wire and a ground wire resistor. The output end of the ground signaling detection circuit is sequentially connected with the amplifying circuit, the shaping circuit, the rectifier circuit and the MCU. The standard value range of the DC voltage value is preset inside the MCU. Compared with the prior art, the detection circuit can detect whether the ground wire resistance value is within a predetermined range or not. Therefore, the safety requirement can be met. The circuit is an ideal ground wire resistance value detection circuit.
Description
Technical field
The present invention relates to a kind of line resistance resistance detection circuit.
Background technology
Many household electrical appliance especially big electrical equipment as refrigerator, washing machine, the power line that air-conditioning etc. is used all is three cores.It is real
As long as having zero line and the live wire two just can be with normal work using the electrical equipment of general civil power on border.Additional this root line is exactly
Ground wire, that is to say, that these electrical equipment have to ground connection.
The introducing of grounding technology is initially the protective measure in order to prevent the equipment such as to be electrically or electronically struck by lightning and taken,
Purpose is that the thunder-strike current that thunder and lightning is produced is incorporated into the earth by lightning rod, so as to play a part of to protect building.Meanwhile,
Ground connection is also a kind of effective means for protecting personal safety, when the phase line that certain reason causes（As wire insulation is bad, circuit is old
Change etc.）When being touched with device housings, the shell of equipment will dangerous voltage produce, the electric current for thus generating will be through protecting field
Line to the earth, so as to play personal safety protective effect.
Line resistance is whether that, for weighing a good important parameter of ground state, line resistance size directly embodies
Electric device with " " good degree that contacts, also reflects the scale of grounded screen.
But line resistance only in the prior art, is judged whether by detecting circuit, and for the resistance of line resistance
Whether value within the limits prescribed and is not concerned with, it is impossible to meet safety requirement.
The content of the invention
It is an object of the invention to provide a kind of resistance that is detectable, judging line resistance whether ground within the limits prescribed
Line resistance resistance detects circuit.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of line resistance resistance detects circuit, including is used to gather ground signalling detection circuit of the phase line to earth signal, amplifies
Circuit, shaping circuit, rectification circuit, and it is used to read the MCU of the DC voltage value of this rectification circuit；The ground signalling inspection
Each detection input of slowdown monitoring circuit is connected respectively phase line, zero line and line resistance, and the ground signalling detects the defeated of circuit
Go out end and be sequentially connected the amplifying circuit, the shaping circuit, the rectification circuit and the MCU；Preset in the MCU
State the standard value range of the DC voltage value of rectification circuit.
The ground signalling detection circuit includes phase mains signal Acquisition Circuit, filter circuit and Safety Approval resistance, described
Each sampling input of phase mains signal Acquisition Circuit is connected respectively phase line and zero line, the phase mains signal Acquisition Circuit it is defeated
Go out the input of the end connection filter circuit, the output end of the filter circuit connects the input of the amplifying circuit；Institute
The reference voltage end for stating phase mains signal Acquisition Circuit is connected to the power supply ground that the line resistance resistance detects circuit by resistance,
The Safety Approval resistance is with being connected to the power supply of the line resistance resistance detection circuit between line resistance.
The phase mains signal Acquisition Circuit includes that the first phase mains signal being made up of resistance R1, resistance R6 and diode D1 is adopted
Collector, one end connection phase line of resistance R1, one end of the other end connection resistance R6 of resistance R1, the other end connection of resistance R6
The positive pole of diode D1, the negative pole connection ground wire of diode D1, the connection end of resistance R1 and resistance R6 is first phase line
The output end of signal acquisition circuit.
The phase mains signal Acquisition Circuit includes that the second phase mains signal being made up of resistance R3, resistance R5 and diode D2 is adopted
Collector, one end connection phase line of resistance R3, one end of the other end connection resistance R5 of resistance R3, the other end connection of resistance R5
The positive pole of diode D2, the negative pole connection ground wire of diode D2, the connection end of resistance R3 and resistance R5 is second phase line
The output end of signal acquisition circuit.
The Safety Approval resistance includes the Safety Approval resistance R8 and Safety Approval resistance R9 that are in series.
After using such scheme, line resistance resistance of the invention detects circuit, detects that circuit is gathered by ground signalling
Phase line is to earth signal（Sine wave signal）, the amplified circuit of this sine wave signal is amplified into shaping circuit and carries out shaping, obtain
To pulse signal, DC voltage is obtained after the rectified circuit rectifies of this pulse signal, the DC voltage of rectification circuit is read by MCU
Value, if this DC voltage value is fallen into MCU in default standard value range, MCU exports the pulse signal of certain frequency, thus
Can determine whether the resistance of line resistance within the limits prescribed；If the DC voltage value of the rectification circuit that MCU reads is pre- not in MCU
If standard value range in, then MCU is without output, thus can determine whether the resistance of line resistance not within the limits prescribed.With it is existing
Whether technology is compared, detection circuit of the invention, within the limits prescribed to can detect that the resistance of line resistance, and meeting safety will
Ask, be a kind of ideal line resistance resistance detection circuit.
Further, in the present invention, the first phase mains signal Acquisition Circuit and the second phase mains signal Acquisition Circuit are provided with, to protect
Card can also collect the signal of phase line in the case where phase line and ground wire are exchanged, it is ensured that ground signalling detection circuit is effective.
Further, in the present invention, two Safety Approval resistance that setting is in series, to prevent one of Safety Approval
Ground leakage current can also be controlled in the safe range of safety requirement when resistance is breakdown.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the invention；
Fig. 2 is the output waveform diagram of phase mains signal Acquisition Circuit in the present invention；
Fig. 3 is the output waveform figure of shaping circuit in the present invention；
Fig. 4 is the output waveform figure of MCU in the present invention；
Fig. 5 is the change schematic diagram of phase line signal acquisition circuit output waveform when line resistance resistance becomes big in the present invention；
Fig. 6 is the change schematic diagram of phase line signal acquisition circuit output waveform when line resistance resistance diminishes in the present invention.
Specific embodiment
A kind of line resistance resistance detection circuit of the invention, as shown in figure 1, including being used to gather phase line to earth signal
Ground signalling detects circuit 1, amplifying circuit 2, shaping circuit 3, rectification circuit 4, and is used to read the direct current of this rectification circuit 4
The MCU 5 of magnitude of voltage.
Ground signalling detection circuit 1 includes phase mains signal Acquisition Circuit, filter circuit and Safety Approval resistance.
The phase mains signal Acquisition Circuit includes the first phase mains signal Acquisition Circuit and the second phase mains signal Acquisition Circuit.The
One phase mains signal Acquisition Circuit is made up of resistance R1, resistance R6 and diode D1, one end of resistance R1（First phase mains signal is gathered
First collection input of circuit）Connection A points, one end of the other end connection resistance R6 of resistance R1, the other end of resistance R6 connects
Connect the positive pole of diode D1, the negative pole of diode D1（Second collection input of the first phase mains signal Acquisition Circuit）Connection B points,
The connection end C points of resistance R1 and resistance R6 are the output end of the first phase mains signal Acquisition Circuit.Second phase mains signal is adopted
Current collection routing resistance R3, resistance R5 and diode D2 are constituted, one end of resistance R3（The first of second phase mains signal Acquisition Circuit is adopted
Collection input）Connection B points, one end of the other end connection resistance R5 of resistance R3, the other end connection diode D2's of resistance R5
Positive pole, the negative pole of diode D2（Second collection input of the second phase mains signal Acquisition Circuit）Connection A points, resistance R3 and resistance
The connection end D points of R5 are the output end of the second phase mains signal Acquisition Circuit.Wherein, A points are phase line or ground wire, and B points are
Ground wire or phase line.That is, when A points are phase line, B points are ground wire；When B points are phase line, A points are ground wire.
In the present invention, only one of which phase mains signal Acquisition Circuit can also complete phase mains signal collecting work, and the present invention is set
Two phase mains signal Acquisition Circuits, to ensure also to be collected in the case where phase line and ground wire are exchanged the signal of phase line, it is ensured that
Ground signalling detection circuit is effective.
The Safety Approval resistance includes Safety Approval resistance R8, R9 for being in series, the connection end of resistance R5 and resistance R6
One end of connection resistance R7, the power supply ground of the other end connection line resistance resistance detection circuit of resistance R7, Safety Approval resistance
The power supply ground of one end connection line resistance resistance detection circuit after R8, R9 series connection, the other end connects one end of line resistance 6, ground
The other end connection the earth of line resistance 6.In the present invention, Safety Approval resistance can be with only one of which, and the present invention sets what is be in series
Two Safety Approval resistance, Ground leakage current can also be controlled in safety when being used to prevent one of Safety Approval resistance breakdown
It is required that safe range in.
The filter circuit include for the first phase mains signal Acquisition Circuit output signal filter the first filter circuit and
It is the second filter circuit that the output signal of the second phase mains signal Acquisition Circuit is filtered, the first filtered electrical routing resistance R2 and electric capacity
C1 is constituted, and the second filtered electrical routing resistance R4 and electric capacity C1 is constituted, and the output signal of the first phase mains signal Acquisition Circuit is through resistance
R2 is connected to the input of amplifying circuit 2, and the output signal of the second phase mains signal Acquisition Circuit is connected to amplification electricity through resistance R4
The input on road 2.
The connection end of resistance R2 and resistance R4 is the output end that ground signalling detects circuit 1, ground signalling detection circuit 1
Output end be sequentially connected amplifying circuit 2, shaping circuit 3, rectification circuit 4 and MCU 5.
During work, line resistance resistance of the invention detects circuit, detects that circuit 1 gathers phase line over the ground by ground signalling
Signal, this phase line is to earth signal（C point signals or D point signals）It is waveform sine wave signal as shown in Figure 2, this sine wave signal
Amplified circuit 2 is amplified into shaping circuit 3 and carries out shaping, obtains waveform pulse signal as shown in Figure 3（E point signals）,
DC voltage is obtained after rectified circuit 4 rectification of this pulse signal, the DC voltage value of rectification circuit 4 is read by MCU 5, if this
DC voltage value is fallen into MCU 5 in default standard value range, then the output waveforms of MCU 5 it is as shown in Figure 4 with certain frequency
The pulse signal of rate（F point signals）, thus can determine whether the resistance of line resistance 6 within the limits prescribed；If it is whole that MCU 5 reads
Not in default standard value range in MCU 5, then thus MCU 5 can determine whether ground wire to the DC voltage value of current circuit 4 without output
The resistance of resistance 6 is not within the limits prescribed.
In the present invention, the standard value range of the DC voltage value of default rectification circuit 4 is entered as follows in MCU 5
Row setting：It is a certain resistance in prescribed limit to take the resistance of line resistance 6（Such as 4K Ω）, then phase line is to earth signal（C point signals
Or D point signals）It is waveform as shown in the G-0V in Fig. 5 or Fig. 6, MCU 5 reads G-0V and eventually passes the straight of the output of rectification circuit 4
Stream magnitude of voltage is simultaneously set as standard value, and the settable positive and negative deviation value of this standard value, the magnitude of voltage in deviation range all meets the requirements,
Magnitude of voltage in this deviation range is described standard value range.Also the resistance of line resistance 6 can be taken in prescribed limit
Certain two resistance, obtains the higher limit and lower limit of standard value, the area between this higher limit and lower limit in the same way
Between value be the standard value range.
When the resistance of line resistance 6 becomes big, as shown in figure 5, waveform such as Fig. 5 of 0 point of rising, C point signals or E point signals
In H-0V shown in, now the dutycycle of E points signal diminishes, rectification circuit 4 output DC voltage value reduction.
When the resistance of line resistance 6 becomes hour, as shown in fig. 6, waveform such as Fig. 6 of 0 point of decline, C point signals or E point signals
In H-0V shown in, now the dutycycle of E points signal becomes big, and the DC voltage value of the output of rectification circuit 4 rises.
In the present invention, be engaged with resistance R1, resistance R6 and diode D1 by setting Safety Approval resistance R8, R9 or with
Can be converted into such as the drift in Fig. 5,6 for the faint change of waveform H-0V after being engaged by resistance R3, resistance R5 and diode D2
State, significant change is produced by the dutycycle for after amplifying circuit 2 and shaping circuit 3, making E point signals, improves detection circuit
Sensitivity.
Compared with prior art, whether detection circuit of the invention, can detect that the resistance of line resistance 6 in the model for specifying
In enclosing, safety requirement is met, be a kind of ideal line resistance resistance detection circuit.
Claims (5)
1. a kind of line resistance resistance detects circuit, it is characterised in that：Including being used to gather ground signalling of the phase line to earth signal
Detection circuit, amplifying circuit, shaping circuit, rectification circuit, and it is used to read the MCU of the DC voltage value of this rectification circuit；
Each detection input of the ground signalling detection circuit is connected respectively phase line, zero line and line resistance, the ground connection letter
Number detection circuit output end be sequentially connected the amplifying circuit, the shaping circuit, the rectification circuit and the MCU；Institute
State the standard value range of the DC voltage value that the rectification circuit is preset with MCU.
2. a kind of line resistance resistance according to claim 1 detects circuit, it is characterised in that：The ground signalling detection
Circuit includes phase mains signal Acquisition Circuit, filter circuit and Safety Approval resistance, each sampling of the phase mains signal Acquisition Circuit
Input is connected respectively phase line and zero line, and the output end of the phase mains signal Acquisition Circuit connects the defeated of the filter circuit
Enter end, the output end of the filter circuit connects the input of the amplifying circuit；The reference of the phase mains signal Acquisition Circuit
Voltage end is connected to the power supply ground that the line resistance resistance detects circuit by resistance, and the Safety Approval resistance is connected to institute
State line resistance resistance detection circuit power supply between line resistance.
3. a kind of line resistance resistance according to claim 1 detects circuit, it is characterised in that：The phase mains signal collection
Circuit includes the first phase mains signal Acquisition Circuit being made up of resistance R1, resistance R6 and diode D1, one end connection of resistance R1
Phase line, one end of the other end connection resistance R6 of resistance R1, the positive pole of the other end connection diode D1 of resistance R6, diode D1
Negative pole connection ground wire, the connection end of resistance R1 and resistance R6 is the output end of the first phase mains signal Acquisition Circuit.
4. a kind of line resistance resistance according to claim 3 detects circuit, it is characterised in that：The phase mains signal collection
Circuit includes the second phase mains signal Acquisition Circuit being made up of resistance R3, resistance R5 and diode D2, one end connection of resistance R3
Phase line, one end of the other end connection resistance R5 of resistance R3, the positive pole of the other end connection diode D2 of resistance R5, diode D2
Negative pole connection ground wire, the connection end of resistance R3 and resistance R5 is the output end of the second phase mains signal Acquisition Circuit.
5. a kind of line resistance resistance according to claim 1 detects circuit, it is characterised in that：The Safety Approval resistance
Including the Safety Approval resistance R8 and Safety Approval resistance R9 that are in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710038777.0A CN106707032A (en) | 2017-01-19 | 2017-01-19 | Ground wire resistance value detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710038777.0A CN106707032A (en) | 2017-01-19 | 2017-01-19 | Ground wire resistance value detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106707032A true CN106707032A (en) | 2017-05-24 |
Family
ID=58906908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710038777.0A Withdrawn CN106707032A (en) | 2017-01-19 | 2017-01-19 | Ground wire resistance value detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106707032A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153156A1 (en) * | 2005-08-29 | 2009-06-18 | Nec Corporation | Insulation resistance detecting apparatus |
| CN102116815A (en) * | 2010-12-30 | 2011-07-06 | 优利德科技(中国)有限公司 | Safety test system |
| CN102928750A (en) * | 2012-10-31 | 2013-02-13 | 科博达技术有限公司 | Alternating voltage insulation failure detection device |
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN203811727U (en) * | 2013-11-28 | 2014-09-03 | 杭州天丽科技有限公司 | Device for detecting commercial power |
| CN104184113A (en) * | 2014-09-02 | 2014-12-03 | 东辉休闲运动用品(上海)有限公司 | SPA pool with electric leakage detection function and control method for electric leakage detection |
| CN206557295U (en) * | 2017-01-19 | 2017-10-13 | 厦门昰能机电科技有限公司 | A kind of line resistance resistance detects circuit |
-
2017
- 2017-01-19 CN CN201710038777.0A patent/CN106707032A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153156A1 (en) * | 2005-08-29 | 2009-06-18 | Nec Corporation | Insulation resistance detecting apparatus |
| CN102116815A (en) * | 2010-12-30 | 2011-07-06 | 优利德科技(中国)有限公司 | Safety test system |
| CN102928750A (en) * | 2012-10-31 | 2013-02-13 | 科博达技术有限公司 | Alternating voltage insulation failure detection device |
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN203811727U (en) * | 2013-11-28 | 2014-09-03 | 杭州天丽科技有限公司 | Device for detecting commercial power |
| CN104184113A (en) * | 2014-09-02 | 2014-12-03 | 东辉休闲运动用品(上海)有限公司 | SPA pool with electric leakage detection function and control method for electric leakage detection |
| CN206557295U (en) * | 2017-01-19 | 2017-10-13 | 厦门昰能机电科技有限公司 | A kind of line resistance resistance detects circuit |
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170524 |