CN202351353U - Electro-magnetic interference detecting system for power line conduction - Google Patents
Electro-magnetic interference detecting system for power line conduction Download PDFInfo
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- CN202351353U CN202351353U CN2011205205546U CN201120520554U CN202351353U CN 202351353 U CN202351353 U CN 202351353U CN 2011205205546 U CN2011205205546 U CN 2011205205546U CN 201120520554 U CN201120520554 U CN 201120520554U CN 202351353 U CN202351353 U CN 202351353U
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- emi
- magnetic interference
- power line
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Abstract
An electro-magnetic interference detecting system for power line conduction comprises an electro-magnetic interference (EMI) receiver, a line impedance stabilization network (LISN), a current probe, a voltage probe, an impedance analysis meter and an oscilloscope which are sequentially connected to form a system, wherein the EMI receiver comprises an input attenuator, a preselector, a high-frequency amplifier, a frequency mixer, an intermediate frequency filter, an envelope detector, detector weighting and a local oscillator. The LISN is a V-shaped structure of 50 omega/ 50 muH. The electro-magnetic interference detecting system for power line conduction is simple and convenient and reliable in the detection process, and facilitates operation of technicians.
Description
Technical field
The utility model relates to the electromagnetic interference (EMI) detection system of electronic electric equipment, particularly relates to power lead Conducted Electromagnetic Interference detection system.
Background technology
Electrical equipment all can produce stronger electricity/magnetic field inevitably in normal course of operation, these electromagnetic energies then can form unnecessary electromagnetic interference (EMI), and this is the problem that need pay much attention to.
Electromagnetic interference (EMI) refers to by electromagnetic disturbance and causes the interference phenomenon that consumer or total system performance descend.Principle and circulation way according to EMI can be divided into Conduction Interference and radiation interference two big classes with it.In low-frequency range, the EMI that power electronic equipment produces is main with Conduction Interference normally.Standard sine waveform on the power lead can be often destroyed from the various interference that produces during other electrical equipments work in nature or the system, and these disturb and can be transmitted to connected other equipment from the generation source along transmission cable again and get on.Because the harm of the Conduction Interference on power lead maximum is also weak, carries out so EMI tests on the basic source that should be chosen in this conduction emission of power lead.
Present EMI test macro and process are very complicated, and the general test personnel are difficult for grasping, so the measuring technology of this respect is needed improvement badly.
The utility model content
The utility model technical matters to be solved is the deficiency to above-mentioned prior art, provides a kind of detection system simpler, the convenient power lead Conducted Electromagnetic Interference detection system reliably of testing process.
Conduction Interference test mainly is that common mode (CM) noise and differential mode (DM) noise that exist in to lead at the section start of power lead or socket place are measured; Power lead Conducted Electromagnetic Interference detection system of the present invention comprises with the lower part: EMI receiver, linear impedance stabilization network (LISN), current probe, they are in turn connected into a system.
Wherein the EMI receiver comprises following components: input attenuator, preselector, radio-frequency amplifier, frequency mixer, intermediate-frequency filter, envelope detector, wave detector weighting, local oscillator.
The EMI receiver records the output voltage of Devices to test (EUT) as the core instrument of EMI test, and its course of work is: at first will be through input radio frequency signal after attenuator, preselector, amplifier are handled and frequency mixer neutralization; Through regulating local oscillator frequencies, can obtain a fixing intermediate frequency; , intermediate-frequency filter obtains the resolution of analyser then after handling; Transfer the intermediate-freuqncy signal that obtains to vision signal by envelope detector again, and carry out weighted through wave detector; At last, the measurement data that meets the CISPR requirement that obtains is shown.
Wherein linear impedance stabilization network is the V-structure of 50 Ω/50 μ H; Wherein low-pass filter can be kept apart the high frequency interference that grid side produces; Capacitance reaches the high frequency interference that the EUT side produces in the receiver, thereby guarantees that the interference that receiver records produces for EUT really.
Wherein current probe is a kind of weak coupling transformer, and the elementary winding of coil generally is to be connected on the coaxial connector, and the power lead that it centered on can be regarded as secondary coil.Utilize the DM that exists in the current probe preliminary judgement lead to disturb and the CM interference.Current probe only produces response to the electric current of centering on lead, and external field is carried out effective isolation.Current probe can be used in the test of low-frequency range usually, and can be placed between LISN and the EUT.
When LISN electric current ability to bear is not enough, or test site be can't satisfy complicated test configurations the time, and voltage available is popped one's head in and replaced LISN to test.When working voltage is popped one's head in, guarantee that any Conducted EMI level of coming automatic power supply is at least than the low 20dB of the Conducted EMI that comes from EUT; Probe and primary power or and EUT between all can not have impedance matching.
The beneficial effect that the utility model had:
The power lead Conducted Electromagnetic Interference detection system of the utility model is simpler, and testing process is convenient reliable, makes things convenient for the technician to operate.
Description of drawings
Fig. 1 is the structural representation of the utility model power lead Conducted Electromagnetic Interference detection system;
Fig. 2 is the structural representation of EMI receiver in the utility model;
Fig. 3 is the structural representation of the utility model neutral line impedance stable network (LISN).
Embodiment
Below in conjunction with specific embodiment the utility model is done further to set forth, but do not limit the utility model.
The power lead Conducted Electromagnetic Interference detection system of the utility model comprises following components: EMI receiver, linear impedance stabilization network (LISN), current probe, they are in turn connected into a system (referring to accompanying drawing 1).
Wherein the EMI receiver comprises following components (referring to accompanying drawing 2): input attenuator, preselector, radio-frequency amplifier, frequency mixer, intermediate-frequency filter, envelope detector, wave detector weighting, local oscillator.
The course of work of EMI receiver is: at first will be through input radio frequency signal after attenuator, preselector, amplifier are handled and frequency mixer neutralization; Through regulating local oscillator frequencies, can obtain a fixing intermediate frequency; , intermediate-frequency filter obtains the resolution of analyser then after handling; Transfer the intermediate-freuqncy signal that obtains to vision signal by envelope detector again, and carry out weighted through wave detector; At last, the measurement data that meets the CISPR requirement that obtains is shown.
Wherein linear impedance stabilization network is the V-structure (referring to accompanying drawing 3) of 50 Ω/50 μ H; Wherein low-pass filter can be kept apart the high frequency interference that grid side produces; Capacitance reaches the high frequency interference that the EUT side produces in the receiver, thereby guarantees that the interference that receiver records produces for EUT really.
Wherein current probe is a kind of weak coupling transformer, and the elementary winding of coil generally is to be connected on the coaxial connector, and the power lead that it centered on can be regarded as secondary coil.Utilize the DM that exists in the current probe preliminary judgement lead to disturb and the CM interference.Current probe only produces response to the electric current of centering on lead, and external field is carried out effective isolation.
The foregoing description is the utility model preferred implementation; But the embodiment of the utility model is not restricted to the described embodiments; Other are any not to deviate from change, the modification done under spirit and the principle of the utility model, substitute, combination, simplify; All should be the substitute mode of equivalence, be included within the protection domain of the utility model.
Claims (3)
1. power lead Conducted Electromagnetic Interference detection system, it is characterized in that: comprise with the lower part: EMI receiver, linear impedance stabilization network, current probe, they are in turn connected into a system.
2. a kind of power lead Conducted Electromagnetic Interference detection system according to claim 1, it is characterized in that: described EMI receiver comprises following part: input attenuator, preselector, radio-frequency amplifier, frequency mixer, intermediate-frequency filter, envelope detector, wave detector weighting, local oscillator.
3. a kind of power lead Conducted Electromagnetic Interference detection system according to claim 1 is characterized in that: described linear impedance stabilization network is the V-structure of 50 Ω/50 μ H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205205546U CN202351353U (en) | 2011-12-14 | 2011-12-14 | Electro-magnetic interference detecting system for power line conduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205205546U CN202351353U (en) | 2011-12-14 | 2011-12-14 | Electro-magnetic interference detecting system for power line conduction |
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| Publication Number | Publication Date |
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| CN202351353U true CN202351353U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205205546U Expired - Fee Related CN202351353U (en) | 2011-12-14 | 2011-12-14 | Electro-magnetic interference detecting system for power line conduction |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928691A (en) * | 2012-10-10 | 2013-02-13 | 中联重科股份有限公司 | System, method and device for detecting electromagnetic transient disturbance signals of electrical equipment |
| CN103645406A (en) * | 2013-12-27 | 2014-03-19 | 国家电网公司 | Level testing system |
| CN105092993A (en) * | 2014-04-17 | 2015-11-25 | 中达电子零组件(吴江)有限公司 | Method and measurement system for detecting power adapter |
| CN105572500A (en) * | 2015-12-15 | 2016-05-11 | 中国北方车辆研究所 | Power supply impedance network access device |
| CN106771793A (en) * | 2017-03-30 | 2017-05-31 | 中国铁道科学研究院 | For the electromagnetism Interference test system and method for rail traffic vehicles |
| CN110501581A (en) * | 2018-05-16 | 2019-11-26 | 联合汽车电子有限公司 | Electromagnetic compatibility testing analysis method and its system |
-
2011
- 2011-12-14 CN CN2011205205546U patent/CN202351353U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928691A (en) * | 2012-10-10 | 2013-02-13 | 中联重科股份有限公司 | System, method and device for detecting electromagnetic transient disturbance signals of electrical equipment |
| CN103645406A (en) * | 2013-12-27 | 2014-03-19 | 国家电网公司 | Level testing system |
| CN105092993A (en) * | 2014-04-17 | 2015-11-25 | 中达电子零组件(吴江)有限公司 | Method and measurement system for detecting power adapter |
| CN105092993B (en) * | 2014-04-17 | 2019-03-29 | 中达电子零组件(吴江)有限公司 | Detect the method and measuring system of power supply adaptor |
| CN105572500A (en) * | 2015-12-15 | 2016-05-11 | 中国北方车辆研究所 | Power supply impedance network access device |
| CN105572500B (en) * | 2015-12-15 | 2018-06-12 | 中国北方车辆研究所 | A kind of source impedance network access device |
| CN106771793A (en) * | 2017-03-30 | 2017-05-31 | 中国铁道科学研究院 | For the electromagnetism Interference test system and method for rail traffic vehicles |
| CN110501581A (en) * | 2018-05-16 | 2019-11-26 | 联合汽车电子有限公司 | Electromagnetic compatibility testing analysis method and its system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20141214 |
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| EXPY | Termination of patent right or utility model |