CN107505526A - Method for detecting low-frequency common-mode interference of direct-current voltage - Google Patents

Method for detecting low-frequency common-mode interference of direct-current voltage Download PDF

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Publication number
CN107505526A
CN107505526A CN201710818663.8A CN201710818663A CN107505526A CN 107505526 A CN107505526 A CN 107505526A CN 201710818663 A CN201710818663 A CN 201710818663A CN 107505526 A CN107505526 A CN 107505526A
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China
Prior art keywords
voltage
disturbance
detection method
low
low frequency
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CN201710818663.8A
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Chinese (zh)
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CN107505526B (en
Inventor
吕吉玉
宿伟
石贤庆
赵建葵
王磊
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Qingdao Sifang Alstom Railway Transportation Equipment Co ltd
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Bombardier Sifang Qingdao Transportation Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/001Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing

Abstract

The invention provides a method for detecting low-frequency common-mode interference of direct-current voltage, and provides a method for testing a low-frequency band conducted transmitting device below 9KHz, which aims to quickly and accurately search whether conducted disturbance exists or not and effectively evaluate and limit the conducted transmitting technology of an inverter product. The detection method is to monitor the grounding peak voltage of the low-voltage direct-current power supply end so as to judge whether the detected direct-current common mode has conducted disturbance. Particularly, the method is more suitable for detecting the common-mode disturbance voltage of the frequency band lower than 9KHz of the direct current/alternating current inversion power supply module or equipment.

Description

The detection method of DC voltage low frequency common interference
Technical field
The present invention proposes that method is investigated in a kind of test to the harassing and wrecking of low pressure low-frequency d common mode, suitable for containing alternating voltage The synthetical compositive evaluating of standard and low-voltage DC supply, belongs to electrical design field.
Background technology
Standard GB/T 4,824 2013 at present《Industry, science and medical treatment (ISM) radio-frequency apparatus electromagnetic disturbance characteristic limit value And measuring method》, there is no limit value for the conducted emission of the following frequency ranges of low frequency 9KHz, will not generally test less than 9KHz frequency ranges Conducted emission.
In field of track traffic, the ripple voltage in DC power supply terminal is produced to inverter apparatus without corresponding clear and definite skill The requirement of art standard.The method of common test ripple voltage, is to be tested between the main track of DC terminal and negative wire, if just Ripple is qualified between line and negative wire, will not test direct current main track over the ground, or the voltage of negative wire over the ground.
For AC/DC inversion products, the pulsation of current supply circuit is inevitably fed back in power input generation Electric current, but pulsating volage is not easy to detect.In the facility level design phase, and in production-type test Qualify Phase, by In the ideal of direct current negative wire Earth Phase pair, it is difficult to find the disturbance voltage problem of AC line over the ground in advance.Equipment is in big system collection Into after assembling, due to the otherness of this equipment impedance, line inevitably has either large or small potential over the ground to integrated system Difference.Relative, in below 9KHz low frequency bands, voltage harassing and wrecking intensity publicly will significantly be increased, so as to directly affect Into system, the normal and safe handling of other equipment, for the high part of the voltage sensitivity that is used on rail vehicle, will be produced Raw obvious common mode harassing and wrecking problem.In addition, according to equipment or the difference of circuit design, this harassing and wrecking can also influence conducted emission survey Other relatively low low frequency bands of amount.
The instrument of existing easily-testing voltage is universal meter, and test data result is generally virtual value, or in the multicycle Average value in time, peak value harassing and wrecking signal can not be tested.If the duration of peak value for harassing signal is shorter but the cycle is longer, Validity Test can not be carried out using universal meter.
In view of this, it is special to propose this method of testing, apply for this patent.
The content of the invention
The detection method of DC voltage low frequency common interference of the present invention, its object is to solve above-mentioned prior art to deposit It is proposed one kind for alternating voltage standard and low-voltage DC supply integrated system, particularly below 9KHz low frequency bands in defect The method of testing of conducted emission equipment, to rapidly and accurately search the presence for whetheing there is conduction interference, using as to inversion products Conducted emission technology effectively assess and limit.
Another goal of the invention is, by the comparison of common mode disturbance voltage rapidly to investigate low frequency disturbance source, to look for The solution harassed to the input feedback of AC/DC inversion products.
For achieving the above object, the detection method of the DC voltage low frequency common interference is that low-voltage direct is supplied Electric end ground connection crest voltage is monitored, to judge whether tested DC common-mode has conduction interference.
Especially, this method is more suitable for being total to less than 9KHz frequency ranges to AC/DC inversion power supply module or equipment Mould disturbance voltage is detected.
To improve accuracy of detection and efficiency.More efficiently corrective measure is, using time-domain signal test device, in voltage While probe ground connection, probe connects the main track at low-voltage DC supply end, negative wire respectively, monitors the voltage wave in test period Shape.Described time-domain signal test device, preferably oscillograph, power quality analyzer or other data collecting systems.
When collecting multiple measuring points in same system and common mode disturbance voltage signal being present, different test points can be contrasted Disturbance voltage intensity, the more strong then measuring point distance harassing and wrecking source of intensity is nearer, then can investigate harassing and wrecking source quickly.
If same equipment only main track or negative wire with the presence of disturbance voltage, judge that the equipment in point position is over the ground Crosstalk.
To sum up content, the detection method of DC voltage low frequency common of the present invention interference, it is simple and easy, for less than The common mode disturbance voltage of 9KHz frequency ranges can be detected rapidly and accurately, contribute to the solution of the disturbance voltage problem of AC line over the ground Certainly, the high electronic unit of voltage sensitivity is effectively protected.Meanwhile, it is capable to which rapidly investigation arrives low frequency disturbance source, and exclude Interference of the equipment crosstalk phenomenon for testing result.
Brief description of the drawings
Fig. 1 is the schematic diagram tested using oscillograph;
Fig. 2 is to use the test circuit figure of main track over the ground;
Fig. 3 is to use the test circuit figure of negative wire over the ground;
Fig. 4 is the waveform example figure for existing over the ground disturbance voltage signal.
As shown in Figures 1 to 4, low-voltage DC supply bus 1,110VDC- negative wires 2,110VDC+ main tracks 3, it is tested low-pressure direct Flow device 4, protecting field 5, crocodile clamping connection protecting field 6, probe connect main track 7, probe 10, crocodile clip (ground wire of popping one's head in) 20.
Embodiment
Embodiment 1, is described in further detail to the present invention below in conjunction with the accompanying drawings.
The common mode disturbance voltage less than 9KHz frequency ranges of AC/DC inversion power supply module or equipment is detected, it is right Low-voltage DC supply end ground connection crest voltage is monitored, to judge whether tested DC common-mode has conduction interference.
Using oscillograph, while voltage probe is grounded, probe connects the main track at low-voltage DC supply end, born respectively Line, monitor the voltage waveform in test period.Specifically,
As shown in figure 1, respectively with the " main track and negative wire of the connection low-voltage direct of probe 10 ", with probe ground wire of voltage probe With connecting this equipment protection or nearby protecting field of equipment of crocodile clip 20 (ground connection of this protecting field and big integrated system is altogether).
Such as Fig. 2WithFig. 3ContrastIt is shown, the test period of time-domain signal is reasonably adjusted, checks voltage waveform.
If voltage is normal, the main track surveyed over the ground, should be shown as 110VDC straight no point such as 110VDC main tracks over the ground The voltage waveform at peak;The negative wire surveyed over the ground, should be shown as the voltage waveform of 0VDC straight no spike.
If voltage has exception, it is either not straight or have pulse voltage spike to survey waveform, as shown in figure 4, direct current is born Line has abnormal voltage waveform example over the ground.
For ensure safely, test out disturbance voltage exactly, should addedly take following measures:
100M bandwidth should at least be met by testing the oscillograph selected or equal waving map recoil simulator, to facilitate to exception The capture of low-frequency voltage signal.
Test the insulation voltage probe of the oscillograph selected or equal waving map recoil simulator, the probe of selection is over the ground Detection range at least should be greater than tested voltage.
For the DC low-voltage system of negative wire ground connection, because negative wire is in theory zero with the electrical potential difference on ground, crocodile clip is grounded It is grounded devoid of risk.
For the DC low-voltage system on the floating ground of negative wire, due to negative wire in theory with the electrical potential difference on ground is endless is all zero, ground connection Before should check probe technologies specifications, ground connection crocodile clip should follow the permission for earth point peak value/root-mean-square value that specifications define Voltage request.The straight-flow system on ground, or negative wire are floated for negative wire by the IT straight-flow systems of resistance eutral grounding, because of negative wire and ground Impedance is relatively large, and the waveform of this method of testing test is generally straight temporal envelope line, if surveyed waveform is not straight or has High peaks amplitude, the basis for estimation that this method can be bad as negative wire insulation against ground.
For large-scale integrated system, can contrast test different measuring points disturbance voltage intensity, in general, if intensity is stronger, Then it is nearer to disturb source for measuring point Lisao.
If measured signal only main track has pulse voltage spike over the ground, or only negative wire has pulse voltage spike over the ground, typically , the equipment of point position is larger for the possibility of crosstalk.
As described above, given plan content in conjunction with the accompanying drawings and embodiments, can derive similar technical scheme.But Every content without departing from technical solution of the present invention, the technical spirit according to the present invention are made any simple to above example Modification, equivalent variations and modification, in the range of still falling within technical solution of the present invention.

Claims (5)

  1. A kind of 1. detection method of DC voltage low frequency common interference, it is characterised in that:Peak value is grounded to low-voltage DC supply end Voltage is monitored, to judge whether tested DC common-mode has conduction interference.
  2. 2. the detection method of DC voltage low frequency common interference according to claim 1, it is characterised in that:For to straight Stream/ac converter power supply module or the common mode disturbance voltage less than 9KHz frequency ranges of equipment are detected.
  3. 3. the detection method of DC voltage low frequency common interference according to claim 1 or 2, it is characterised in that:During use Domain signal-testing apparatus, while voltage probe is grounded, probe connects the main track at low-voltage DC supply end, negative wire respectively, prison Control the voltage waveform in test period.
  4. 4. the detection method of DC voltage low frequency common interference according to claim 3, it is characterised in that:Contrast different surveys The disturbance voltage intensity of pilot, the more strong then measuring point distance harassing and wrecking source of intensity are nearer.
  5. 5. the detection method of DC voltage low frequency common interference according to claim 3, it is characterised in that:If only main track, Or negative wire then judges the equipment in point position as crosstalk over the ground with the presence of disturbance voltage.
CN201710818663.8A 2017-09-12 2017-09-12 Method for detecting low-frequency common-mode interference of direct-current voltage Active CN107505526B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109188152A (en) * 2018-10-15 2019-01-11 青岛四方庞巴迪铁路运输设备有限公司 Method for detecting common-mode disturbance of grounding circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104407255A (en) * 2014-12-05 2015-03-11 浙江省质量检测科学研究院 Simple device and method for testing conduction disturbance voltage of handheld electric tool and method

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
CN104407255A (en) * 2014-12-05 2015-03-11 浙江省质量检测科学研究院 Simple device and method for testing conduction disturbance voltage of handheld electric tool and method

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吴祯玮等: "低频共模传导抗扰度试验波形验证方法研究", 《上海计量测试》 *
孙铁雷等: "某电动汽车共模骚扰辐射试验与分析", 《2009中国汽车工程学会年会论文集》 *
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109188152A (en) * 2018-10-15 2019-01-11 青岛四方庞巴迪铁路运输设备有限公司 Method for detecting common-mode disturbance of grounding circuit
CN109188152B (en) * 2018-10-15 2021-02-12 青岛四方庞巴迪铁路运输设备有限公司 Method for detecting common-mode disturbance of grounding circuit

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Address after: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province

Patentee after: Qingdao Sifang Alstom railway transportation equipment Co.,Ltd.

Address before: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province 266111

Patentee before: BOMBARDIER SIFANG (QINGDAO) TRANSPORTATION Ltd.

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