CN103176095B - Earth detector and method - Google Patents
Earth detector and method Download PDFInfo
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- CN103176095B CN103176095B CN201110439684.1A CN201110439684A CN103176095B CN 103176095 B CN103176095 B CN 103176095B CN 201110439684 A CN201110439684 A CN 201110439684A CN 103176095 B CN103176095 B CN 103176095B
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Abstract
The present invention proposes a kind of earth detector and method.Earth detector comprises: test side; Electric capacity, one end of described electric capacity is connected with described test side; First resistance; Controller, the output terminal of described controller is connected with the other end of described electric capacity by described first resistance, the input end of described controller is also connected with the other end of described electric capacity, described controller is used for exporting predetermined waveform signal by described output terminal, and received the detection signal of described test side by described input end, and described detection signal and described predetermined waveform signal are compared with the resistance of detection system relative to the insulation resistance on ground.The resistance value of insulation resistance can be measured by the present invention, except can providing electric leakage alarming, can also according to the degradation of insulation trend of concrete resistance value evaluating system.
Description
Technical field
The present invention relates to electric vehicle engineering field, particularly a kind of earth detector and method.
Background technology
The electrical leakage detecting method of existing electric automobile mainly contains two kinds.One exchanges detection method, also comprise two kinds of modes particularly: one produces to exchange by waveshape generating device to detect ripple signal, then detect ripple signal through filtering circuit to interchange to filter, again filtered interchange is detected ripple signal and be converted to direct current signal, voltage corresponding for direct current signal and two threshold voltage points are compared, draw general electric leakage signal and serious drain signal, the problem of this mode is, simply can only report to the police, assessment cannot be made to the degradation of insulation situation of Full Vehicle System; Another kind adopts electricity leakage sensor to report to the police, and the problem of this mode is, in process of production, because of the discreteness of components and parts, the alarming value of the product at every turn produced is all variant, produces first-pass yield low.
The electrical leakage detecting method of another kind of electric automobile is DC detection method, adopts the positive and negative both direction of DC constant voltage power supply to be added in test lead specifically, by the forward current that measures and inverse current, calculates insulation impedance value.The problem of this mode is, weak output signal, measures difficulty, and measuring accuracy requires higher, realizes cost higher.
Summary of the invention
The present invention is intended at least to solve one of technical matters existed in prior art.
For this reason, one object of the present invention is to propose a kind of earth detector, comprising: test side first resistance; Controller, the output terminal of described controller is connected with the other end of described electric capacity by described first resistance, the input end of described controller is also connected with the other end of described electric capacity, described controller is used for exporting predetermined waveform signal by described output terminal, and received the detection signal of described test side by described input end, and described detection signal and described predetermined waveform signal are compared with the resistance of detection system relative to the insulation resistance on ground.
According to the earth detector of the embodiment of the present invention, the present impedance value of insulation resistance is calculated by sampled value, except can providing electric leakage alarming, can also according to the degradation of insulation trend of the resistance value evaluating system calculated, user can diagnose in advance according to degradating trend thus, improves the security of Full Vehicle System.In addition, by the mode of Digital Calibration, the different problem of the alarming value caused because of the discrete type of components and parts is solved.
Another object of the present invention is also to propose a kind of electrical leakage detecting method, comprise the following steps: A. exports predetermined waveform signal by the output terminal of controller, the output terminal of wherein said controller is connected with the insulation resistance of system relative to ground with electric capacity by the first resistance, and the input end of described controller is connected with the node between described first resistance and electric capacity, the node between described electric capacity and described insulation resistance is test side; B. the detection signal of described test side is received by the input end of described controller; And described detection signal and described predetermined waveform signal are compared the resistance detecting described insulation resistance by controller described in C..
According to the electrical leakage detecting method of the embodiment of the present invention, the present impedance value of insulation resistance is calculated by sampled value, except can providing electric leakage alarming, can also according to the degradation of insulation trend of the resistance value evaluating system calculated, user can diagnose in advance according to degradating trend thus, improves the security of Full Vehicle System.In addition, by the mode of Digital Calibration, the different problem of the alarming value caused because of the discrete type of components and parts is solved.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic diagram of the earth detector of one embodiment of the invention;
Fig. 2 is the schematic equivalent circuit of the earth detector shown in Fig. 1;
Fig. 3 is the schematic diagram of the earth detector of another embodiment of the present invention; And
Fig. 4 is the process flow diagram of the electrical leakage detecting method of one embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Wherein, term " first " and " second " object only for describing, and instruction or hint relative importance can not be interpreted as.
Fig. 1 is the schematic diagram of the earth detector of one embodiment of the invention.As shown in Figure 1, this earth detector comprises: test side 10, first resistance R1, electric capacity C and controller 20.
One end of electric capacity C is connected with test side 10, and the other end of electric capacity C is connected with the first resistance R1.The output terminals A of controller 20 is connected with electric capacity C by the first resistance R1, and the input end B of controller 20 is also connected with electric capacity C.Controller 20 exports predetermined waveform signal from output terminals A, such as sine wave, square wave, triangular wave and pulse-width modulation waveform etc., and this waveform signal, after the first resistance R1 and electric capacity C decays, arrives test side 10.When system is different relative to the value of the insulation resistance R2 on ground, the detection signal of test side 10 can change thereupon, and namely the first resistance R1, electric capacity C and insulation resistance R2 carry out dividing potential drop to the predetermined waveform signal that controller 20 exports.Controller 20 receives the detected signal value of test side 10 by input end B, compares according to the detected signal value of test side 10 and the predetermined waveform signal of output the resistance calculating insulation resistance R2.
Particularly, be illustrated in figure 2 the equivalent circuit diagram of the embodiment shown in Fig. 1, as shown in Figure 2,
Arrangement can obtain,
Wherein, Z
r2for the resistance of insulation resistance R2, Z
r1be the resistance of the first resistance R1, Z
cfor the resistance value of electric capacity C,
for the phasor representation form of the ac voltage signal of test side 10,
for the phasor representation form of the ac voltage signal that controller 20 exports.
If use U
crepresent the effective value of the ac voltage signal of test side 10, φ represents ac voltage signal
relative to
initial phase, then
in like manner,
(initial phase is fixed as 0)
Owing to can be measured by controller 40
effective value U
cand initial phase φ, and, U
s, Z
r1for fixed value, therefore, controller 20 is utilized can to calculate the resistance Z of insulation resistance R2 according to formula (2)
r2.
In addition, in one embodiment of the invention, controller 40 also can comprise memory module.Store the table of comparisons of the resistance of insulation resistance R2 and the voltage of test side 10 in memory module, the detection signal that controller 40 inputs according to input end B and the table of comparisons calculate the resistance of insulation resistance R2.
Particularly, from formula (1),
and Z
r2when getting different value, have unique
corresponding with it.Further,
along with Z
r2increase and increase.Therefore, can by getting Z
r2different value in actual measurement range, measures U
cvalue, forms the table of comparisons and is stored in controller 20.During use, according to the U that actual acquisition arrives
cvalue, just can estimate Z
r2value.
The table of comparisons if following table 1 is the data of actual measurement:
| R2 setting value | Uc magnitude of voltage |
| r 1 | v 1 |
| r 2 | v 2 |
| r 3 | v 3 |
| … | … |
| r n | v n |
The table of comparisons of table 1 actual measurement data
Wherein, r
1< r
2< r
3< r
n, v
1< v
2< v
3< v
n.
According to table 1, as the magnitude of voltage U collected
cfor v, and v
m-1< v < v
m(1 < m≤n), then
In one embodiment of the invention, the resistance of insulation resistance R2 and the first threshold preset and Second Threshold also can compare by controller 20, such as first threshold is threshold point of generally leaking electricity, and Second Threshold is serious drain threshold point, and first threshold is greater than Second Threshold.When the resistance of insulation resistance R2 is less than general electric leakage threshold point, carry out general leakage-current alarm.When the resistance of insulation resistance R2 is less than serious drain threshold point, carry out serious drain warning.
According to the earth detector of the embodiment of the present invention, calculated the present impedance value of insulation resistance by sampled value, except can providing electric leakage alarming, can also according to the degradation of insulation trend of the resistance value evaluating system calculated.In addition, by the mode of Digital Calibration, the different problem of the alarming value caused because of the discrete type of components and parts is solved.
Fig. 3 is the schematic diagram of the earth detector of another embodiment of the present invention.As shown in Figure 3, on the basis of the embodiment shown in Fig. 1, this earth detector also comprises the first wave filter 20 and the second wave filter 30.First wave filter 20 is connected between the output terminals A of controller 20 and the first resistance R1, and the second wave filter 30 is connected between the input end B of controller 20 and electric capacity C.Thus, the first wave filter 20 can carry out filtering to the predetermined waveform signal that controller 20 exports, and the signal that the second wave filter 20 can detect test side 10 carries out filtering, thus improves accuracy of detection, improves the computational accuracy of the resistance of insulation resistance R2.
In one embodiment of the invention, the first wave filter 20 and the second wave filter 30 are low-pass filter.
According to the earth detector of the embodiment of the present invention, at least there is following beneficial effect:
1, the present impedance value of insulation resistance is calculated by sampled value, except can providing electric leakage alarming, can also according to the degradation of insulation trend of the resistance value evaluating system calculated, user can diagnose in advance according to degradating trend thus, improves the security of Full Vehicle System.
2, by the mode of Digital Calibration, the different problem of the alarming value caused because of the discrete type of components and parts is solved.
According to above-described embodiment, the present invention also proposes a kind of electrical leakage detecting method.
Fig. 4 is the process flow diagram of the electrical leakage detecting method of one embodiment of the invention.As shown in Figure 4, this electrical leakage detecting method comprises the following steps:
Step S401, predetermined waveform signal is exported by the output terminal of controller, such as sine wave, square wave, triangular wave and pulse-width modulation waveform etc., the output terminal of its middle controller is connected with the insulation resistance of system relative to ground with electric capacity by the first resistance, and the input end of controller is connected with the node between the first resistance and electric capacity, the node between electric capacity and insulation resistance is test side.
Step S402, receives the detection signal of test side by the input end of controller.
Step S403, detection signal and predetermined waveform signal are compared the resistance calculating insulation resistance by controller.
As the description of said apparatus embodiment, in one embodiment of the invention, controller can by the resistance of following formula,
Wherein, Z
r2for the resistance of insulation resistance, Z
r1for the resistance of the first predetermined resistance,
for the alternating voltage of detection signal,
for the alternating voltage of predetermined waveform signal, Z
cfor the resistance value of electric capacity, U
cand φ is respectively the effective value of the alternating voltage of detection signal and the detection signal initial phase relative to the alternating voltage of predetermined waveform signal, U
sfor the voltage effective value of predetermined waveform signal.
In another embodiment of the present invention, controller by being compared by the table of comparisons of detection signal with the resistance and test side voltage that prestore insulation resistance in the controller, thus can calculate the resistance of current insulation resistance.The description of concrete computation process comparable device embodiment, is not described in detail herein.
In addition, in another embodiment of the present invention, this electrical leakage detecting method can also comprise the following steps:
Step S404, the resistance of insulation resistance and the first threshold preset and Second Threshold compare by controller, and wherein first threshold is greater than Second Threshold.
Step S405, when the resistance of insulation resistance is less than first threshold, controller provides general electric leakage alarming.
Step S406, when the resistance of insulation resistance is less than Second Threshold, controller provides serious drain alarm.
According to the electrical leakage detecting method of the embodiment of the present invention, the present impedance value of insulation resistance is calculated by sampled value, except can providing electric leakage alarming, can also according to the degradation of insulation trend of the resistance value evaluating system calculated, user can diagnose in advance according to degradating trend thus, improves the security of Full Vehicle System.In addition, by the mode of Digital Calibration, the different problem of the alarming value caused because of the discrete type of components and parts is solved.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although and illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. an earth detector, is characterized in that, comprising:
Test side;
Electric capacity, one end of described electric capacity is connected with described test side;
First resistance;
Controller, the output terminal of described controller is connected with the other end of described electric capacity by described first resistance, the input end of described controller is also connected with the other end of described electric capacity, described controller is used for exporting predetermined waveform signal by described output terminal, and receive the detection signal of described test side after described capacitance fade by described input end, and described detection signal and described predetermined waveform signal are compared with the resistance of detection system relative to the insulation resistance on ground.
2. earth detector as claimed in claim 1, is characterized in that, also comprise:
Be connected to the first wave filter between the output terminal of described controller and described first resistance; And
Be connected to the second wave filter between the input end of described controller and described electric capacity.
3. earth detector as claimed in claim 2, it is characterized in that, described first wave filter and described second wave filter are low-pass filter.
4. the earth detector as described in any one of claims 1 to 3, is characterized in that, the resistance of described controller insulation resistance according to following formulae discovery:
Wherein, Z
r2for the resistance of described insulation resistance, Z
r1for the resistance of predetermined described first resistance,
for the alternating voltage of described detection signal,
for the alternating voltage of described predetermined waveform signal, Z
cfor the resistance value of described electric capacity, U
cand φ is respectively the alternating voltage effective value of described detection signal and the alternating voltage of the described detection signal initial phase relative to the alternating voltage of described predetermined waveform signal, U
sfor the voltage effective value of described predetermined waveform signal.
5. the earth detector as described in any one of claims 1 to 3, it is characterized in that, described controller also comprises memory module, for the table of comparisons of the voltage of the resistance and described test side that store described insulation resistance, the detection signal that described controller inputs according to described input end and the described table of comparisons calculate the resistance of described insulation resistance.
6. the earth detector as described in any one of claims 1 to 3, it is characterized in that, described controller is also for comparing the resistance of described insulation resistance and the first threshold preset and Second Threshold, wherein said first threshold is greater than Second Threshold, and provide general electric leakage alarming when the resistance of described insulation resistance is less than described first threshold, serious drain alarm is provided when the resistance of described insulation resistance is less than described Second Threshold.
7. an electrical leakage detecting method, is characterized in that, comprises the following steps:
A. predetermined waveform signal is exported by the output terminal of controller, the output terminal of wherein said controller is connected with the insulation resistance of system relative to ground with electric capacity by the first resistance, and the input end of described controller is connected with the node between described first resistance and electric capacity, the node between described electric capacity and described insulation resistance is test side;
B. the detection signal of described test side after described capacitance fade is received by the input end of described controller; And
C. described detection signal and described predetermined waveform signal are compared the resistance detecting described insulation resistance by described controller.
8. electrical leakage detecting method as claimed in claim 7, it is characterized in that, described step C specifically comprises:
The resistance of described controller insulation resistance according to following formulae discovery,
Wherein, Z
r2for the resistance of described insulation resistance, Z
r1for the resistance of predetermined described first resistance,
for the alternating voltage of described detection signal,
for the alternating voltage of described predetermined waveform signal, Z
cfor the resistance value of described electric capacity, U
cand φ is respectively the effective value of the alternating voltage of described detection signal and the described detection signal initial phase relative to the alternating voltage of described predetermined waveform signal, U
sfor the voltage effective value of described predetermined waveform signal.
9. electrical leakage detecting method as claimed in claim 7, it is characterized in that, described step C specifically comprises:
Described detection signal and the resistance of insulation resistance prestored and the table of comparisons of test side voltage are compared by described controller, calculate the resistance of described insulation resistance.
10. the electrical leakage detecting method as described in any one of claim 7 to 9, is characterized in that, also comprises step:
The resistance of described insulation resistance and the first threshold preset and Second Threshold compare by described controller, and wherein said first threshold is greater than Second Threshold;
When the resistance of described insulation resistance is less than described first threshold, described controller provides general electric leakage alarming; And when the resistance of described insulation resistance is less than described Second Threshold, described controller provides serious drain alarm.
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| CN201110439684.1A CN103176095B (en) | 2011-12-23 | 2011-12-23 | Earth detector and method |
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| CN105406442B (en) * | 2015-12-14 | 2018-11-23 | 长沙奥托自动化技术有限公司 | A kind of soft starter motor electrical leakage detecting method |
| KR102063097B1 (en) * | 2017-07-19 | 2020-01-07 | 이현창 | Electrical leak detecting apparatus and electrical leak detecting method for improving the electrical leak detecting accuracy |
| CN110221126B (en) * | 2018-03-01 | 2021-07-16 | 联合汽车电子有限公司 | Insulation impedance detection system and detection method |
| CN109142874B (en) * | 2018-09-27 | 2021-03-02 | 蔚来(安徽)控股有限公司 | Insulation detection circuit, insulation detection method and charging control method |
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| JP2003125530A (en) * | 2001-10-15 | 2003-04-25 | Yazaki Corp | Leakage detection device for high-voltage vehicle |
| JP2004286523A (en) * | 2003-03-20 | 2004-10-14 | Yazaki Corp | Earth leakage determining device, earth leakage determination program, and insulation resistance measuring unit |
| CN201083806Y (en) * | 2007-07-19 | 2008-07-09 | 比亚迪股份有限公司 | Electrical leakage sensor test device |
| JP2009085830A (en) * | 2007-10-01 | 2009-04-23 | Toyota Industries Corp | Insulation resistance deterioration detector for industrial vehicle |
| CN201242583Y (en) * | 2008-07-22 | 2009-05-20 | 比亚迪股份有限公司 | Electrical leakage detection device |
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