CN206557295U - A kind of line resistance resistance detects circuit - Google Patents
A kind of line resistance resistance detects circuit Download PDFInfo
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- CN206557295U CN206557295U CN201720065465.4U CN201720065465U CN206557295U CN 206557295 U CN206557295 U CN 206557295U CN 201720065465 U CN201720065465 U CN 201720065465U CN 206557295 U CN206557295 U CN 206557295U
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Abstract
Circuit is detected the utility model discloses a kind of line resistance resistance, it includes gathering ground signalling detection circuit of the phase line to earth signal, amplifying circuit, shaping circuit, rectification circuit, and to the MCU for the DC voltage value for reading this rectification circuit；Each detection input of the ground signalling detection circuit is connected respectively phase line, zero line and line resistance, and the output end of the ground signalling detection circuit is sequentially connected the amplifying circuit, the shaping circuit, the rectification circuit and the MCU；The standard value range of the DC voltage value of the rectification circuit is preset with the MCU.Compared with prior art, whether within the limits prescribed detection circuit of the present utility model, the resistance that can detect that line resistance, meets safety requirement, is a kind of ideal line resistance resistance detection circuit.
Description
Technical field
The utility model is related to a kind of line resistance resistance detection circuit.
Background technology
Many especially big electrical equipment of household electrical appliance are as refrigerator, washing machine, and the power line that air-conditioning etc. is used all is three cores.It is real
As long as having zero line and live wire two just can be with normal work using the electrical equipment of general civil power on border.This additional root line is exactly
Ground wire, that is to say, that these electrical equipment have to ground connection.
The introducing of grounding technology be initially in order to prevent protective measure that electrically or electronically etc. equipment is 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 protecting building.Meanwhile,
Ground connection is also a kind of effective means for protecting personal safety, when phase line caused by certain reason（Such as wire insulation is bad, and circuit is old
Change etc.）When being touched with device housings, the shell of equipment will dangerous voltage produce, the electric current thus generated will be through protecting field
Line is to the earth, so as to play personal safety protective effect.
Line resistance is that, for weighing a whether 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.
Utility model content
The purpose of this utility model be to provide it is a kind of it is detectable, whether within the limits prescribed judge the resistance of line resistance
Line resistance resistance detection circuit.
To achieve these goals, the utility model is adopted the following technical scheme that：
A kind of line resistance resistance detects circuit, including detects circuit to the ground signalling of earth signal to gather phase line,
Amplifying circuit, shaping circuit, rectification circuit, and to the MCU for the DC voltage value for reading this rectification circuit；The ground connection letter
Each detection input of number detection circuit is connected respectively phase line, zero line and line resistance, and the ground signalling detects circuit
Output end be sequentially connected the amplifying circuit, the shaping circuit, the rectification circuit and the MCU；Preset in the MCU
There is the standard value range of the DC voltage value of the 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
State the reference voltage end of phase mains signal Acquisition Circuit and the power supply that the line resistance resistance detects circuit be connected to 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 being adopted by resistance R1, resistance R6 and diode D1 the first phase mains signal constituted
Collector, resistance R1 one end connection phase line, resistance R1 other end connection resistance R6 one end, resistance R6 other end connection
Diode D1 positive pole, diode D1 negative pole connection ground wire, resistance R1 and resistance R6 connection end is first phase line
The output end of signal acquisition circuit.
The phase mains signal Acquisition Circuit includes being adopted by resistance R3, resistance R5 and diode D2 the second phase mains signal constituted
Collector, resistance R3 one end connection phase line, resistance R3 other end connection resistance R5 one end, resistance R5 other end connection
Diode D2 positive pole, diode D2 negative pole connection ground wire, resistance R3 and resistance R5 connection end 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 being in series.
After such scheme, line resistance resistance of the present utility model detects circuit, and circuit is detected by ground signalling
Phase line is gathered to earth signal（Sine wave signal）, it is whole that the amplified circuit of this sine wave signal is amplified into shaping circuit progress
Shape, obtains pulse signal, and DC voltage is obtained after the rectified circuit rectifies of this pulse signal, and the straight of rectification circuit is read by MCU
Magnitude of voltage is flowed, if this DC voltage value is fallen into MCU in default standard value range, the pulse letter of MCU output certain frequencies
Number, it thus can determine whether the resistance of line resistance within the limits prescribed；If the DC voltage value for the rectification circuit that MCU is read does not exist
In MCU in default standard value range, then MCU is without output, thus can determine whether the resistance of line resistance not within the limits prescribed.
Compared with prior art, whether within the limits prescribed detection circuit of the present utility model, can detect that the resistance of line resistance,
Safety requirement is met, is a kind of ideal line resistance resistance detection circuit.
Further, in the utility model, provided with the first phase mains signal Acquisition Circuit and the second phase mains signal Acquisition Circuit,
To ensure 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 utility model, two Safety Approval resistance being in series are set, to prevent one of safety
Ground leakage current can also be controlled in the safe range of safety requirement when certification resistance is breakdown.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model；
Fig. 2 is the output waveform diagram of phase mains signal Acquisition Circuit in the utility model；
Fig. 3 is the output waveform figure of shaping circuit in the utility model；
The output waveform figure that Fig. 4 is MCU in the utility model；
The change signal of phase line signal acquisition circuit output waveform when Fig. 5 becomes big for line resistance resistance in the utility model
Figure；
The change signal of phase line signal acquisition circuit output waveform when Fig. 6 diminishes for line resistance resistance in the utility model
Figure.
Embodiment
A kind of line resistance resistance detection circuit of the present utility model, as shown in figure 1, including believing over the ground to gather phase line
Number ground signalling detection circuit 1, amplifying circuit 2, shaping circuit 3, rectification circuit 4, and to read this rectification circuit 4
The MCU 5 of DC voltage value.
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, resistance R1 one end（First phase mains signal is gathered
First collection input of circuit）A points are connected, resistance R1 other end connection resistance R6 one end, the resistance R6 other end connects
Connect diode D1 positive pole, diode D1 negative pole（Second collection input of the first phase mains signal Acquisition Circuit）B points are connected,
Resistance R1 and resistance R6 connection end C points 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, resistance R3 one end（The first of second phase mains signal Acquisition Circuit is adopted
Collect input）B points are connected, resistance R3 other end connection resistance R5 one end, the resistance R5 other end connects diode D2's
Positive pole, diode D2 negative pole（Second collection input of the second phase mains signal Acquisition Circuit）Connect A points, resistance R3 and resistance
R5 connection end D points 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 utility model, only one of which phase mains signal Acquisition Circuit can also complete phase mains signal collecting work, this practicality
New two phase mains signal Acquisition Circuits of setting, to ensure also collect the letter of phase line in the case where phase line and ground wire are exchanged
Number, it is ensured that ground signalling detection circuit is effective.
The Safety Approval resistance includes Safety Approval resistance R8, the R9 being in series, resistance R5 and resistance R6 connection end
Connection resistance R7 one end, the power supply of resistance R7 other end connection line resistance resistance detection circuit, Safety Approval resistance
With detecting the power supply of circuit, the other end connects one end of line resistance 6, ground to one end connection line resistance resistance after R8, R9 series connection
The other end connection the earth of line resistance 6.In the utility model, Safety Approval resistance can be set with only one of which, the utility model
Two Safety Approval resistance being in series, Ground leakage current can also be controlled during preventing that one of Safety Approval resistance is breakdown
Make in the safe range of safety requirement.
The filter circuit include for the first phase mains signal Acquisition Circuit output signal filter the first filter circuit and
The second filter circuit filtered for the output signal of the second phase mains signal Acquisition Circuit, the first filtered electrical routing resistance R2 and electric capacity
C1 is constituted, the second filtered electrical routing resistance R4 and electric capacity C1 compositions, 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.
Resistance R2 and resistance R4 connection end 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 present utility model detects circuit, detects that circuit 1 gathers phase line by ground signalling
To earth signal, this phase line is to earth signal（C point signals or D point signals）For waveform sine wave signal as shown in Figure 2, this sine wave
The amplified circuit 2 of signal is amplified into shaping circuit 3 and carries out shaping, obtains waveform pulse signal as shown in Figure 3（E points are believed
Number）, DC voltage is obtained after the rectified rectification of circuit 4 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, the output waveforms of MCU 5 as shown in Figure 4 have one
Determine the pulse signal of frequency（F point signals）, thus can determine whether the resistance of line resistance 6 within the limits prescribed；If MCU 5 is read
Rectification circuit 4 DC voltage value not in MCU 5 in default standard value range, then thus MCU 5 can determine whether without output
The resistance of line resistance 6 is not within the limits prescribed.
In the utility model, the standard value range of the DC voltage value of default rectification circuit 4 is according to such as lower section in MCU 5
Formula is set：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 points
Signal or D point signals）It is waveform as shown in the G-0V in Fig. 5 or Fig. 6, MCU 5, which reads G-0V and eventually passes rectification circuit 4, to be exported
DC voltage value and be set as standard value, the magnitude of voltage that this standard value can be set in positive and negative deviation value, deviation range all meets
It is required that, the magnitude of voltage in this deviation range is described standard value range.Also the resistance of line resistance 6 can be taken prescribed limit
Two resistances of certain interior, obtain the higher limit and lower limit of standard value, between this higher limit and lower limit in the same way
Interval 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 export DC voltage value reduction.
When the resistance of line resistance 6 becomes small, 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 that rectification circuit 4 is exported rises.
In the utility model, by setting Safety Approval resistance R8, R9 to be engaged with resistance R1, resistance R6 and diode D1
Or waveform H-0V faint change can be converted into after being engaged with resistance R3, resistance R5 and diode D2 as in Fig. 5,6
Drifting state, after amplifying circuit 2 and shaping circuit 3, makes the dutycycle of E point signals produce significant change, improves detection electricity
The sensitivity on road.
Compared with prior art, whether detection circuit of the present utility model, can detect that the resistance of line resistance 6 in regulation
In the range of, safety requirement is met, is 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 to gather ground signalling of the phase line to earth signal
Detection circuit, amplifying circuit, shaping circuit, rectification circuit, and to the MCU for the DC voltage value for reading 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 for the DC voltage value that the rectification circuit is preset with MCU.
2. a kind of line resistance resistance detection circuit according to claim 1, 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
The power supply of the line resistance resistance detection circuit is connected to by resistance, the Safety Approval resistance is connected to institute to voltage end
State line resistance resistance detection circuit power supply between line resistance.
3. a kind of line resistance resistance detection circuit according to claim 1, 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, resistance R1 one end connection
Phase line, resistance R1 other end connection resistance R6 one end, resistance R6 other end connection diode D1 positive pole, diode D1
Negative pole connection ground wire, resistance R1 and resistance R6 connection end are the output end of the first phase mains signal Acquisition Circuit.
4. a kind of line resistance resistance detection circuit according to claim 3, 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, resistance R3 one end connection
Phase line, resistance R3 other end connection resistance R5 one end, resistance R5 other end connection diode D2 positive pole, diode D2
Negative pole connection ground wire, resistance R3 and resistance R5 connection end are the output end of the second phase mains signal Acquisition Circuit.
5. a kind of line resistance resistance detection circuit according to claim 2, it is characterised in that：The Safety Approval resistance
Including the Safety Approval resistance R8 and Safety Approval resistance R9 being in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065465.4U CN206557295U (en) | 2017-01-19 | 2017-01-19 | A kind of line resistance resistance detects circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065465.4U CN206557295U (en) | 2017-01-19 | 2017-01-19 | A kind of line resistance resistance detects circuit |
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| CN206557295U true CN206557295U (en) | 2017-10-13 |
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| CN201720065465.4U Active CN206557295U (en) | 2017-01-19 | 2017-01-19 | A kind of line resistance resistance detects circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
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2017
- 2017-01-19 CN CN201720065465.4U patent/CN206557295U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
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