CN106154046B - Ground Impedance Detection Device - Google Patents
Ground Impedance Detection Device Download PDFInfo
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- CN106154046B CN106154046B CN201510204739.9A CN201510204739A CN106154046B CN 106154046 B CN106154046 B CN 106154046B CN 201510204739 A CN201510204739 A CN 201510204739A CN 106154046 B CN106154046 B CN 106154046B
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Abstract
本发明公开了一种接地阻抗检测装置，耦接至包括第一电源线、第二电源线以及接地线的电力系统，该接地阻抗检测装置包括接地阻抗检测电路以及控制器。接地阻抗检测电路，包括第一输入节点以及第二输入节点，其中第一输入节点耦接至第一电源线以及第二电源线之一者，第二输入节点耦接至该接地阻抗检测装置的接地端，其中接地阻抗检测电路根据第一输入节点以及第二输入节点的电压以及直流参考电压，而产生直流输出电压。控制器根据直流参考电压以及直流输出电压，而判断接地线以及接地端之间的接地阻抗。
The present invention discloses a ground impedance detection device, coupled to a power system including a first power line, a second power line and a ground line, the ground impedance detection device includes a ground impedance detection circuit and a controller. The ground impedance detection circuit includes a first input node and a second input node, wherein the first input node is coupled to one of the first power line and the second power line, and the second input node is coupled to the ground end of the ground impedance detection device, wherein the ground impedance detection circuit generates a DC output voltage according to the voltage of the first input node and the second input node and a DC reference voltage. The controller determines the ground impedance between the ground line and the ground end according to the DC reference voltage and the DC output voltage.
Description
Technical field
The present invention relates to a kind of impedance ground detection device, in particular between a kind of measurement ground line and ground terminal
The detection device of resistance value.
Background technique
When local end equipment is coupled to electric system, the case where local end equipment lacks good ground connection, is not connect
By, and the risk of local side equipment fault rises with it.Various problems, such as instrument will be will lead to by lacking effective earthed system
Watch Error (instrumentation errors), harmonic distortion, power factor and other many possible intermittent difficulties
Topic will occur therewith.If providing fault current exclusion not over the earthed system for correctly designing and being regularly maintained
To earth's surface, fault current, which is understood, oneself finds out unexpected charge exclusion path, in some instances it may even be possible to the danger for causing user to get an electric shock
Machine.
In addition, good earthed system also can effectively prevent damage factory and equipment, it is therefore necessary to improve equipment
Reliability, and reduce a possibility that damaging equipment because of fault current and personnel is caused to get an electric shock.Furthermore if can be in power train
Before system operation it can be learnt that if the impedance value of impedance ground, that is, it can avoid the excessively high electric system of docking ground impedance and grasped
The effect of making, and then being avoided crisis from occurring in advance.
Summary of the invention
In view of this, the present invention proposes a kind of impedance ground detection device, it is coupled to unified power system, wherein the electric power
System includes one first power supply line, a second source line and a ground line, and impedance ground detection device includes: an impedance ground
Detection circuit and a controller.The impedance ground detection circuit includes one first input node and one second input section
Point, wherein first input node is coupled to the one of first power supply line and the second source line, described second
Input node is coupled to a ground terminal of the impedance ground detection device, wherein the impedance ground detection circuit is according to described
The voltage and a DC reference voltage (V of one input node and second input nodeREF) and generate direct current output electricity
Press (VOUT).The controller according to the DC reference voltage and the DC output voltage, judge the ground line and
One impedance ground value (R of the impedance ground between the ground terminalPE)。
An embodiment according to the present invention, the electric system are a single-phase three-wire system, and the electric system includes one
Firewire, a neutral conductor and the ground line, first input node are coupled to the firewire and the neutral conductor wherein
One of.
According to another embodiment of the present invention, the electric system is a two-phase, three-wire system, and the electric system includes
One first firewire, one second firewire and the ground line, first firewire have a first phase and second fire
Line has a second phase, wherein first input node is coupled to times of first firewire and second firewire
One.
According to still another embodiment of the invention, the electric system is a three-phase four wire system, and the electric system includes
One first firewire, one second firewire, a third firewire and the ground line, first firewire have a first phase, institute
Stating the second firewire has a third phase with a second phase and the third firewire, wherein the first input node coupling
It is connected to one of first firewire, second firewire and described third firewire.
An embodiment according to the present invention, the impedance ground detection circuit further include: one first operational amplifier, one
One resistance, a second resistance, a 3rd resistor, one the 4th resistance, a first capacitor and one second capacitor.First operation
Amplifier includes one first positive input node and one first negative input node, wherein first operational amplifier receives always
The voltage value of first positive input node described in stream supply voltage and comparison and the first negative input node, and in an output section
Point generates the DC output voltage.The first resistor has a first resistor value (R1), and it is coupled to first input
Between node and the first negative input node.The second resistance has a second resistance value (R2), and be coupled to described
Between first negative input node and the output node.The 3rd resistor has a 3rd resistor value (R3), and be coupled to
Between second input node and the first positive input node.4th resistance has one the 4th resistance value (R4),
And be coupled between a reference input node and the first positive input node, wherein the DC reference voltage (VREF) mention
It is supplied to the reference input node.The first capacitor be coupled to the output node and the first negative input node it
Between, second capacitor is coupled between the first positive input node and the reference input node, wherein described first
Input node includes an AC signal, the first capacitor and second capacitor to select a bandwidth to filter out the friendship
Flow signal.
An embodiment according to the present invention, the impedance ground detection circuit further include one first clamp circuit.Described
One clamp circuit is coupled to the negative input node, to provide the negative input node clamping protection.
An embodiment according to the present invention, the controller according toFormula, obtain the impedance ground
Value；Wherein VOUTIt is obtained for measurement.
An embodiment according to the present invention, impedance ground detection device further include an ac voltage detection circuit.The friendship
Flowing voltage detecting circuit includes a third input node and one the 4th input node, wherein the third input node is coupled to
First power supply line, the 4th input node is coupled to the second source line, wherein the ac voltage detection circuit
A detection voltage is exported according to an alternating voltage of the third input node and the 4th input node, wherein described
Detecting voltage includes a direct current component (VDC) an and AC portion, the controller is according to the amplitude (AM) of the AC portion
And judge the alternating voltage (VM) size, and according to the direct current component and the DC output voltage (VOUT) and sentence
The size for the impedance ground value of breaking.
An embodiment according to the present invention, the ac voltage detection circuit include: a second operational amplifier, one the 5th
Resistance, one the 6th resistance, one the 7th resistance, one the 8th resistance, a third capacitor and one the 4th capacitor.Second operation is put
Big device includes one second positive input node and one second negative input node, wherein the second operational amplifier receives a direct current
The voltage value of the second positive input node described in voltage and comparison and the second negative input node is supplied, and detects voltage in one
Node exports the detection voltage.5th resistance has one the 5th resistance value (R5), and it is coupled to the third input section
Between point and the second negative input node.6th resistance has one the 6th resistance value (R6), and it is coupled to described
Between two negative input nodes and the detection voltage node.7th resistance has one the 7th resistance value (R7), and couple
Between the 4th input node and the second positive input node.8th resistance has one the 8th resistance value
(R8), and be coupled between a reference input node and the second positive input node, wherein the DC reference voltage mentions
It is supplied to the reference input node.The third capacitor is coupled to the detection voltage node and the second negative input section
Between point, the 4th capacitor is coupled between the second positive input node and the reference input node, wherein described
Third capacitor and the 4th capacitor are to filter out a high-frequency noise.
An embodiment according to the present invention, the ac voltage detection circuit include: one second clamp circuit and one
Three clamp circuits.Second clamp circuit is coupled to the second negative input node, to provide the second negative input section
Point clamping protection.The third clamp circuit is coupled to the second positive input node, to provide the second positive input section
Point clamping protection.
An embodiment according to the present invention, the controller according toReference formula, obtain ground connection resistance
Anti- value；Wherein VOUTIt is obtained for measurement.
Detailed description of the invention
Fig. 1 shows the block diagram of impedance ground detection device described in an embodiment according to the present invention；
Fig. 2 shows the circuit diagram of impedance ground detection circuit described in an embodiment according to the present invention；
Fig. 3 shows the block diagram of the impedance ground detection device described according to another embodiment of the present invention；
Fig. 4 shows the circuit diagram of ac voltage detection circuit described in an embodiment according to the present invention.
Wherein, appended drawing reference:
100,200,300 impedance ground detection device
101,301 impedance ground detection circuit
102,302 1 controller
110 electric system
201 first operational amplifiers
202 first resistors
203 second resistances
204 3rd resistors
205 the 4th resistance
206 first clamp circuits
207 first capacitors
208 second capacitors
303,400 ac voltage detection circuit
401 second operational amplifiers
402 the 5th resistance
403 the 6th resistance
404 the 7th resistance
405 the 8th resistance
406 second clamp circuits
407 third clamp circuits
408 third capacitors
409 the 4th capacitors
The first power supply line of P1
P2 second source line
PE ground line
NI1First input node
NI2Second input node
NI3Third input node
NI44th input node
RPEImpedance ground
NREFReference input node
VREFDC reference voltage
NOUTOutput node
VOUTDC output voltage
NP1First positive input node
NN1First negative input node
NP2Second positive input node
NN2Second negative input node
VSDirect current supplies voltage
NDTDetect voltage node
VDTDetect voltage
Specific embodiment
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, hereafter especially exemplified by a preferred embodiment, and
Cooperate institute's accompanying drawings, to be described in detail below:
Preferred embodiment according to the present invention described below.It must be noted that the present invention provides many
Applicable concept of the invention, disclosed specific embodiment, is only for explanation and reaches and use certain party of the invention herein
Formula, without can be used to limit to the scope of the present invention.
Fig. 1 shows the block diagram of impedance ground detection device described in an embodiment according to the present invention.As shown in Figure 1,
Impedance ground detection device 100 includes impedance ground detection circuit 101 and controller 102,100 coupling of impedance ground detection device
It is connected to electric system 110, electric system 110 has the first power supply line P1, second source line P2 and ground line PE, wherein electric power
System 110 is to output AC voltage.An embodiment according to the present invention, impedance ground detection device 100 are connection power train
The electric power converter of system, such as Vehicular rechargeable station.
Impedance ground detection circuit 101 includes the first input node NI1And the second input node NI2, the first input node
NI1It is coupled to the one of the first power supply line P1 and second source line P2, the second input node NI2It is coupled to impedance ground inspection
The ground terminal of device is surveyed, wherein having impedance ground R between ground line PE and ground terminalPE, impedance ground detection circuit 101
According to the first input node NI1And the second input node NI2Voltage and DC reference voltage VREF, and in output node NOUT
Generate DC output voltage VOUT。
It is to be understood that ground line PE is grounding wire of power system, and ground terminal is the sheet of impedance ground detection device 100
Ground equipment ground end (local ground).The advantage of the invention is that merely with the straight of 100 local of impedance ground detection device
Stream supply voltage and the ground terminal of local, can estimate the impedance of local ground terminal to long-range ground line.Of the invention
Evaluation method will be in hereafter describing in detail.
An embodiment according to the present invention, controller 102 is according to DC reference voltage VREFAnd the direct current that measurement obtains is defeated
Voltage V outOUTVoltage value, and judge impedance ground RPEImpedance ground value.It will be detailed below impedance ground RPEWith it is straight
Flow reference voltage VREFAnd the DC output voltage V that measurement obtainsOUTDetailed relation.
An embodiment according to the present invention, electric system 110 be single-phase three-wire system, and including firewire (live wire),
The neutral conductor (neutral wire) and ground line (earth line), that is, the first power supply line P1 and second source line P2
Respectively firewire (live wire) and the neutral conductor (neutral wire).As the first input node NI1Be coupled to firewire and
When one of neutral conductor, impedance ground detection circuit 101 can be according to the first input node NI1And the second input node NI2
Voltage and DC reference voltage VREFAnd generate DC output voltage VOUT。
According to another embodiment of the present invention, electric system 110 is two-phase, three-wire system, and including the first firewire (Line
1), the second firewire (Line 2) and ground line (earth line), that is, the first power supply line P1 and second source line P2
Respectively the first firewire and the second firewire.As the first input node NI1It is coupled to one of the first firewire and the second firewire
When, impedance ground detection circuit 101 can be according to the first input node NI1And the second input node NI2Voltage and direct current
Reference voltage VREFAnd generate DC output voltage VOUT。
According to still another embodiment of the invention, electric system 110 is three-phase four wire system, and including the first firewire (R), the
Two firewires (S), third firewire (T) and ground line, wherein the phase difference between the first firewire, the second firewire and third firewire
It is all 120 degree.At this point, electric system 110 has the first power supply line P1, second source line P2 and third power supply line P3, wherein
Electric system 110 has the first power supply line P1, second source line P2 and third power supply line P3 is respectively the first firewire, the second fire
Line and third firewire.As the first input node NI1When being coupled to one of the first firewire, the second firewire and third firewire,
Impedance ground detection circuit 101 can be according to the first input node NI1And the second input node NI2Voltage and direct current ginseng
Examine voltage VREFAnd generate DC output voltage VOUT。
Fig. 2 shows the circuit diagram of impedance ground detection circuit described in an embodiment according to the present invention.As shown in Fig. 2,
Impedance ground detection circuit 200 include the first operational amplifier 201, first resistor 202, second resistance 203,3rd resistor 204,
4th resistance 205, the first clamp circuit 206, first capacitor 207 and the second capacitor 208.
First operational amplifier 201 includes the first positive input node NP1And the first negative input node NN1, wherein the first fortune
It calculates amplifier 201 and receives direct current supply voltage VS, and compare the first positive input node NP1And the first negative input node NN1Electricity
Pressure, and in output node NOUTGenerate DC output voltage VOUT。
First resistor 202 has first resistor value R1, and is coupled to the first input node NI1And the first negative input section
Point NN1Between.An embodiment according to the present invention, first resistor 202 be with several resistance concatenation, with meet the insulation of safety away from
From.Second resistance 203 has second resistance value R2, and it is coupled to the first negative input node NN1And output node NOUTBetween.
3rd resistor 204 has 3rd resistor value R3, and it is coupled to the second input node NI2And the first positive input section
Point NP1Between, wherein the second input node NI2It is coupled to the ground terminal of the impedance ground detection device.4th resistance 205 has
4th resistance value R4, and it is coupled to reference input node NREFAnd the first positive input node NP1Between, wherein DC reference is electric
Press VREFIt is provided to reference input node NREF。
First clamp circuit 206 is coupled to the first negative input node NN1, to eliminate the first negative input node NN1It is prominent
Wave, that is, clamping protection is provided.First capacitor 207 is coupled to output node NOUTAnd the first negative input node NN1Between, one
Two capacitors 208 are coupled to the first positive input node NP1And reference input node NREFBetween, wherein first capacitor 207 and
Two capacitors 208 are to be designed as low-pass amplifier, first capacitor 207 and the second capacitor 208 for impedance ground detection circuit 200
To select a bandwidth, and then filter out from the first input node NI1And the second input node NI2AC signal, with reduce
Influence of the AC signal to impedance ground detection circuit 200, can be in output node N using low-pass characteristicOUTGenerate direct current output electricity
Press VOUT。
As DC reference voltage VREFWhen injecting impedance ground detection circuit 200, impedance ground detection circuit 200 is according to the
One input node NI1And the second input node NI2Voltage and DC reference voltage VREFAnd generate DC output voltage
VOUT, controller 102 is more according to the DC output voltage V that obtains of measurementOUTAnd DC reference voltage VREFDifference connect to calculate
Ground impedance RPE。
An embodiment according to the present invention, direct current supply voltage VSFor 12V, DC reference voltage VREFFor 6V, and it is grounded
Impedance RPEIt is equivalent to be coupled to the first input node NI1And between ground terminal, first resistor value R1And 3rd resistor value R3For
1000k Ω, second resistance value R2 and the 4th resistance value R4For 402k Ω.However, first resistor value R1, second resistance value R2,
Three resistance value R3And the 4th resistance value R4It can arbitrarily select, herein for convenience of explanation, select first resistor value R1Equal to third
Resistance value R3And second resistance value R2Equal to the 4th resistance value R4。
Due to the first input node NI1It is coupled to the first power supply line P1 and second source line P2 of Fig. 1 electric system 110
One of them, and electric system 110 utilizes the first power supply line P1 and second source line P2 output AC voltage, because passing through
Impedance ground detection circuit 200 is designed as to the circuit of a low-pass characteristic, so output voltage VOUTFor flip-flop, thus it is following
Analysis all only needs to consider flip-flop.First positive input node NP1Voltage value VP1It can be obtained by formula 1:
Due to 3rd resistor value R3For 1000k Ω, the 4th resistance value R4For 402k Ω and DC reference voltage VREFFor 6V,
Therefore the first positive input node NP1Voltage value VP1For 4.28V.Since the enlargement ratio of ideal operational amplifier is unlimited
Greatly, if therefore if the first operational amplifier 201 is considered as ideal amplifier, the first positive input node NP1And first negative input
Node NN1It can be considered imaginary short (virtual short circuit).
It is, the first negative input node NN1Voltage value VN1Equal to the first positive input node NP1Voltage value VP1And it is
4.28V, DC output voltage VOUTIt can be obtained via formula 2:
The controller 102 of Fig. 1 is via comparing DC reference voltage VREFAnd the DC output voltage V that measurement obtainsOUTIt
Difference, it can be seen that impedance ground RPEResistance value.
Formula (2) according to the present invention can show formula (3) that controller 102 can be counted using formula 3 in conjunction with formula (1)
Calculate impedance ground RPEResistance value.
In other words, the controller 102 of Fig. 1 can be according to first resistor value R1, second resistance value R2, DC reference voltage VREF
And the DC output voltage V that measurement obtainsOUT, impedance ground R is calculated using formula 3PEResistance value.
According to another embodiment of the present invention, due to the stray capacitance on signal path and the capacitor to filter out interference
Detection will be made to generate error, therefore the calculation of the impedance ground needs corresponding amendment.
Fig. 3 shows the block diagram of the impedance ground detection device described according to another embodiment of the present invention.Such as Fig. 3 institute
Show, impedance ground detection device 300 includes impedance ground detection circuit 301, controller 302 and ac voltage detection circuit
303.Compared to Figure 1, impedance ground detection device 300 is compared with the ac voltage detection circuit of impedance ground detection device more than 100
303。
Ac voltage detection circuit 303 includes third input node NI3And the 4th input node NI4, wherein alternating voltage
The third input node N of detection circuit 303I3And the 4th input node NI4It is respectively coupled to the first power supply line P1 and second
Power supply line P2, to detect the alternating voltage V of the first power supply line P1 and second source line P2M, and in detection voltage node NDT
Output detection voltage VDT。
It is to be understood that ground line PE and ground terminal are belonging respectively to electric system 310 and impedance ground detection device 300
Ground connection.
Detect voltage VDTIncluding direct current component VDCAnd AC portion VAC, controller 302 is according to direct current component VDCAnd it surveys
The DC output voltage V measured outOUTAnd impedance ground R is calculated using formula 4PEResistance value.In other words, formula 4 is with straight
Stream part VDCReplace DC reference voltage VREFAcquire impedance ground RPE.Controller 302 more utilizes AC portion VACAmplitude A M
Electric system 310 is obtained via the size of alternating voltage VM provided by the first power supply line P1 and second source line P2.
An embodiment according to the present invention, since controller 302 needs to detect electricity by ac voltage detection circuit 303
The alternating voltage V that Force system 310 is exportedMIf controller 302 is still with DC reference voltage VREFAnd the direct current that measurement obtains
Output voltage VOUTAcquire impedance ground RPEIf, it is necessary to additionally utilize a stitch by DC reference voltage VREFIt is provided to controller
302.It is, controller 302 utilizes detection voltage VDTDirect current component VDCAnd the DC output voltage V that measurement obtainsOUT
Acquire impedance ground RPEWhen, then it is not required to DC reference voltage V in additionREFIt is provided to controller 302, the stitch of controller 302 is also
It can save as other purposes.
Fig. 4 shows the circuit diagram of ac voltage detection circuit described in an embodiment according to the present invention.As shown in figure 4,
Ac voltage detection circuit 400 include second operational amplifier 401, the 5th resistance 402, the 6th resistance 403, the 7th resistance 404,
8th resistance 405, the second clamp circuit 406, third clamp circuit 407, third capacitor 408 and the 4th capacitor 409.
Second operational amplifier 401 includes the second positive input node NP2And one second negative input node NN2, wherein second
Operational amplifier 401 receives direct current and supplies voltage VSAnd compare the second positive input node NP2And the second negative input node NN2Electricity
Pressure value, and in detection voltage node NDTGenerate detection voltage VDT。
5th resistance 402 has the 5th resistance value R5, and it is coupled to third input node NI3And the second negative input section
Point NN2Between.An embodiment according to the present invention, the 5th resistance 402 be with several resistance concatenation, with meet the insulation of safety away from
From.6th resistance 403 has the 6th resistance value R6, and it is coupled to the second negative input node NN2And detection voltage node NDTIt
Between.
7th resistance 404 has the 7th resistance value R7, and it is coupled to the 4th input node NI4And the second positive input section
Point NP2Between.An embodiment according to the present invention, the 7th resistance 404 be with several resistance concatenation, with meet the insulation of safety away from
From.8th resistance 405 has the 8th resistance value R8, and it is coupled to reference input node NREFAnd the second positive input node NP2
Between, wherein DC reference voltage VREFIt is provided to the reference input node NREF。
Second clamp circuit 406 is coupled to the second negative input node NN2, to eliminate the second negative input node NN2It is prominent
Wave.Third clamp circuit is coupled to the second positive input node NP2, to eliminate the second positive input node NP2Surging.
Third capacitor 408 is coupled to detection voltage node NDTAnd the second negative input node NN2Between.4th capacitor 409
It is coupled to the second positive input node NP2And reference input node NREFBetween, wherein third capacitor 408 and the 4th capacitor 409
It can be by making to detect voltage V to select a band to be tolerant alternating componentDTIncluding direct current component VDCAnd AC portion VAC, and
High-frequency noise can be filtered out.
An embodiment according to the present invention, it is 12V, DC reference voltage V that direct current, which supplies voltage Vs,REFFor 6V, and electric power
The alternating voltage V that system 310 is exported via the first power supply line P1 and second source line P2MRoot mean square (root mean
Square, RMS) size be 220V, the 5th resistance value R5And the 7th resistance value R7For 1000k Ω, the 6th resistance value R6And the
Eight resistance value R8For 12.1k Ω.
As third input node NI3And the 4th input node NI4It is respectively coupled to the first power supply line P1 and second source
When line P2, third input node NN3And the 4th input node NI4Between alternating voltage VMFor 220V.Therefore, work as alternating voltage
VMRoot mean square be 220V when, peak value 311.08V, detection voltage VDTAC portion VACAmplitude A M be 3.764V.
In other words, controller 302 can be according to detection voltage VDTAC portion VACAmplitude A M, the 5th resistance value R5、
6th resistance value R6, the 7th resistance value R7And the 8th resistance value R8, push back and obtain practical alternating voltage VM。
Therefore, those of ordinary skill in the art can be exported using the impedance ground detection circuit 200 of Fig. 2 of the present invention
DC output voltage VOUT, in conjunction with the first resistor 202 of impedance ground detection circuit 200, second resistance 203,3rd resistor 204,
4th resistance 205 and DC reference voltage VREFDesign parameter, and accurate impedance ground value R is calculated with formula 3PE。
When needing to reduce the input stitch of controller, then using the ac voltage detection circuit 400 of Fig. 4 of the invention
Export detection voltage VDTDirect current component VDCReplace DC reference voltage VREF, then accurately ground connection is calculated with formula 4 and is hindered
Anti- value RPE.Wherein, output can be detected voltage V by controllerDTIt averagely obtains replacing DC reference voltage VREF, and can detect simultaneously
Voltage VDTAC portion VAC, can save DC reference voltage VREFIt is input to the input stitch of controller.
The feature of many embodiments described above makes those of ordinary skill in the art clearly understood that this
The form of specification.Those of ordinary skill in the art it will be appreciated that its using disclosure of the present invention based on
It completes the purpose for being identical to above-described embodiment and/or reaches to be identical to above-mentioned implementation to design or change other processing procedures and structure
The advantages of example.Those of ordinary skill in the art is not also it will be appreciated that depart from the equivalent of the spirit and scope of the present invention
Construction can make arbitrarily change, substitution and retouching without departing from the spirit and scope of the present invention, but these change accordingly, replace
In generation, all should fall within the scope of protection of the appended claims of the present invention with retouching.
Claims (11)
1. a kind of impedance ground detection device, it is coupled to unified power system, the electric system includes one first power supply line, one the
Two power supply lines and a ground line, wherein the impedance ground detection device includes:
One impedance ground detection circuit, including one first input node and one second input node, wherein first input
Node is coupled to one of first power supply line and the second source line, and second input node is coupled to this and connects
One ground terminal of ground resistance anti-detection devices, wherein the impedance ground detection circuit is according to first input node and described
The voltage of second input node and a DC reference voltage VREF, and generate a DC output voltage VOUT；And
One controller judges the ground line and described according to the DC reference voltage and the DC output voltage
One impedance ground value R of the impedance ground between ground terminalPE；
Wherein, the impedance ground detection circuit further include:
One first operational amplifier, including one first positive input node and one first negative input node, wherein first fortune
Calculate the electricity that amplifier receives the first positive input node described in direct current supply voltage and comparison and the first negative input node
Pressure value, and the DC output voltage is generated in an output node；
One first resistor has a first resistor value R1And it is coupled to first input node and the first negative input section
Between point；
One second resistance has a second resistance value R2And be coupled to the first negative input node and the output node it
Between；
One 3rd resistor has a 3rd resistor value R3And it is coupled to second input node and the first positive input section
Between point；
One the 4th resistance has one the 4th resistance value R4And it is coupled to a reference input node and the first positive input node
Between, wherein the DC reference voltage VREFIt is provided to the reference input node.
2. impedance ground detection device as described in claim 1, wherein the electric system is a single-phase three-wire system, institute
State electric system include a firewire, a neutral conductor and the ground line, first input node be coupled to the firewire with
And one of described neutral conductor.
3. impedance ground detection device as described in claim 1, wherein the electric system is a two-phase, three-wire system, institute
Stating electric system includes one first firewire, one second firewire and the ground line, and first firewire has a first phase
And second firewire has a second phase, wherein first input node is coupled to first firewire and described
One of second firewire.
4. impedance ground detection device as described in claim 1, wherein the electric system is a three-phase four wire system, institute
Stating electric system includes one first firewire, one second firewire, a third firewire and the ground line, and first firewire has
One first phase, second firewire have a third phase with a second phase and the third firewire, wherein described
First input node is coupled to one of first firewire, second firewire and described third firewire.
5. impedance ground detection device as described in claim 1, wherein the impedance ground detection circuit further include:
One first capacitor is coupled between the output node and the first negative input node；And
One second capacitor is coupled between the first positive input node and the reference input node；
Wherein first input node includes an AC signal, and the first capacitor and second capacitor are to select one
Bandwidth is to filter out the AC signal.
6. impedance ground detection device as claimed in claim 5, wherein the impedance ground detection circuit further include:
One first clamp circuit is coupled to the first negative input node, protects to provide the first negative input node clamp
Shield.
7. impedance ground detection device as claimed in claim 5, wherein the controller according to
Formula, obtain the impedance ground value；Wherein VOUTIt is obtained for measurement.
8. impedance ground detection device as claimed in claim 1 or 5, wherein further include:
One ac voltage detection circuit, including a third input node and one the 4th input node, wherein the third inputs
Node is coupled to first power supply line, and the 4th input node is coupled to the second source line, wherein the alternating current
Pressure detection circuit exports detection electricity according to an alternating voltage of the third input node and the 4th input node
Pressure, wherein the detection voltage includes a direct current component VDCAnd an AC portion, the controller is according to the AC portion
Amplitude A M and judge the alternating voltage VMSize, and sentenced according to the direct current component and the DC output voltage
The size for the impedance ground value of breaking.
9. impedance ground detection device as claimed in claim 8, wherein the ac voltage detection circuit includes:
One second operational amplifier, including one second positive input node and one second negative input node, wherein second fortune
Calculate the electricity that amplifier receives the second positive input node described in direct current supply voltage and comparison and the second negative input node
Pressure value, and the detection voltage is exported in a detection voltage node；
One the 5th resistance has one the 5th resistance value R5And it is coupled to the third input node and the second negative input section
Between point；
One the 6th resistance has one the 6th resistance value R6And it is coupled to the second negative input node and the detection voltage section
Between point；
One the 7th resistance has one the 7th resistance value R7And it is coupled to the 4th input node and the second positive input section
Between point；
One the 8th resistance has one the 8th resistance value R8And it is coupled to a reference input node and the second positive input node
Between, wherein the DC reference voltage is provided to the reference input node；
One third capacitor is coupled between the detection voltage node and the second negative input node；And
One the 4th capacitor is coupled between the second positive input node and the reference input node；
Wherein the third capacitor and the 4th capacitor are to filter out a high-frequency noise.
10. impedance ground detection device as claimed in claim 9, wherein the ac voltage detection circuit includes:
One second clamp circuit is coupled to the second negative input node, protects to provide the second negative input node clamp
Shield；And
One third clamp circuit is coupled to the second positive input node, protects to provide the second positive input node clamp
Shield.
11. impedance ground detection device as claimed in claim 9, wherein the controller according to
Formula, obtain the impedance ground value；Wherein VOUTIt is obtained for measurement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510204739.9A CN106154046B (en) | 2015-04-27 | 2015-04-27 | Ground Impedance Detection Device |
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|---|---|---|---|
| CN201510204739.9A CN106154046B (en) | 2015-04-27 | 2015-04-27 | Ground Impedance Detection Device |
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| CN106154046B true CN106154046B (en) | 2019-01-01 |
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| TWI652890B (en) * | 2017-07-27 | 2019-03-01 | 群光電能科技股份有限公司 | Power conversion system with clamp mode switching |
| CN114371422A (en) * | 2022-01-07 | 2022-04-19 | 厦门普为光电科技有限公司 | Intelligent grounding detection device and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1396918A2 (en) * | 2002-09-06 | 2004-03-10 | Bae Systems Controls, Inc. | Ground fault detection system |
| CN2888458Y (en) * | 2005-10-27 | 2007-04-11 | 珠海泰坦科技股份有限公司 | Geodetic network grounding impedance tester |
| CN102288834A (en) * | 2010-06-03 | 2011-12-21 | 李尔公司 | Ground monitor |
| CN103376365A (en) * | 2012-04-28 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Impedance ground testing device and probe with same |
-
2015
- 2015-04-27 CN CN201510204739.9A patent/CN106154046B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1396918A2 (en) * | 2002-09-06 | 2004-03-10 | Bae Systems Controls, Inc. | Ground fault detection system |
| CN2888458Y (en) * | 2005-10-27 | 2007-04-11 | 珠海泰坦科技股份有限公司 | Geodetic network grounding impedance tester |
| CN102288834A (en) * | 2010-06-03 | 2011-12-21 | 李尔公司 | Ground monitor |
| CN103376365A (en) * | 2012-04-28 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Impedance ground testing device and probe with same |
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