CN109819641B - Multi-user unit radiation emission positioning and reforming method for passive optical network - Google Patents
Multi-user unit radiation emission positioning and reforming method for passive optical network Download PDFInfo
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- CN109819641B CN109819641B CN201910288907.5A CN201910288907A CN109819641B CN 109819641 B CN109819641 B CN 109819641B CN 201910288907 A CN201910288907 A CN 201910288907A CN 109819641 B CN109819641 B CN 109819641B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0098—Shielding materials for shielding electrical cables
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
Abstract
The invention relates to the field of electronic communication, in particular to a radiation emission positioning and modifying method for a passive optical network multi-user unit, which comprises the following steps: diagnosing sources and propagation paths of the interference; carrying out safe grounding lap joint on the EUT; the unwanted frequency components are removed from the frequency domain through filtering, and the electromagnetic disturbance is reduced in both conduction and radiation aspects; suppressing various electromagnetic interferences propagating through a space by shielding; replacing the suspect component with a component that meets EMC requirements; for the crystal oscillator product, the output energy of the crystal oscillator and harmonic waves thereof is reduced by a method of connecting resistors in series or in parallel. The invention starts from the root, reduces the radiation energy from the source, destroys or changes the path of radiation interference, reduces gaps, strengthens filtering, changes the position of a line to destroy a radiation mechanism, and can quickly and accurately carry out the radiation emission positioning adjustment and modification of the multi-user unit of the passive optical network.
Description
Technical Field
The invention relates to the field of electronic communication, in particular to a radiation emission positioning and modifying method for a passive optical network multi-user unit.
Background
With the development of communication, Passive Optical Network (PON) products are more and more widely used, and MDU (multi-user terminal unit) is one of the more complicated products, and meeting electromagnetic compatibility (EMC) requirements is a necessary precondition for products to move to the world. Disqualification of the radiation emission of the MDU becomes a significant factor and difficulty problem for disturbing hardware developers, resulting in delay of project development progress.
EMC rectification refers to a compensation method adopted after a product has a problem in the EMC test process. The purpose of EMC rectification work is reduced the interference that EUT (equipment under test) itself produced, accords with standard requirement, and EUT equipment under test self interference killing feature improves simultaneously, satisfies the requirement equally. The rectification is to use an EMC method to restrain potential problems so that the problems do not occur.
Radiative emission, conducted emission are two major aspects of EMI (electromagnetic interference). In view of this, we summarize, summarize and refine an effective rectification method based on years of test rectification practice, which can be referred to by hardware developers in product Radiation Emission (RE) test rectification.
Disclosure of Invention
The invention aims to provide a radiation emission positioning and modifying method for a multi-user unit of a passive optical network, which can quickly and accurately reduce the self interference of EUT equipment to be tested and improve the anti-interference capability of the EUT equipment to be tested.
In order to solve the technical problems, the invention adopts the following technical scheme:
a radiation emission positioning and modifying method for a passive optical network multi-user unit comprises the following steps:
diagnosing sources and propagation paths of the interference;
carrying out safe grounding lapping on an EUT (equipment under test) in advance;
the unwanted frequency components are removed from the frequency domain through filtering, and the electromagnetic disturbance is reduced in both conduction and radiation aspects;
suppressing various electromagnetic interferences propagating through a space by shielding;
replacing the suspect component with a component that meets EMC (electromagnetic compatibility) requirements;
for the crystal oscillator product, the output energy of the crystal oscillator and harmonic waves thereof is reduced by a method of connecting resistors in series or in parallel.
The method for diagnosing the source and the propagation path of the interference comprises the steps of finding out the maximum radiation direction, removing peripheral signal lines, and judging the power supply radiation interference intensity of the EUT (equipment under test) to obtain the source and the propagation path.
According to a further technical scheme, after peripheral signal lines are removed, if the frequency points of the tested equipment exceeding the standard are still high, the strength of noise interference of all main parts of components on a circuit board is detected by a magnetic field probe to find high points, and the strength of noise interference of components on a main part is detected by an electric field probe or a probe to find high points.
A further technical solution is that, when diagnosing the source and propagation path of the interference, it is checked whether the EUT (device under test) metal casing screw is screwed up or not, and whether the grounding of the socket is good or not.
The further technical scheme is that when the peripheral signal wires are removed, the power wires are reserved, and the non-removable signal wires are judged by adding ferrite magnetic rings.
The further technical scheme is that the specific method for judging the power line radiation interference strength of the EUT to obtain the source and the propagation path is as follows:
after all redundant cables are pulled out, if the radiation is qualified, the problem of common mode current of the cables is eliminated, then all the cables are connected with equipment, whether the radiation is qualified or not is judged, if the radiation is qualified, the judgment is finished, and if the radiation is not qualified, the common mode current is continuously eliminated;
if the radiation is still unqualified after all the redundant cables are pulled out, a magnetic ring is added on the power line, the radiation is restrained after the magnetic ring is added, the common mode current is eliminated by using a processing filter, the elimination is finished if the radiation is qualified, and if the radiation is not restrained or unqualified after the magnetic ring is added, the shielding effect of the case is checked.
A further technical scheme is that the common mode current eliminating method of the cable is that a ferrite magnetic ring is sleeved on the cable, if the cable cannot be filtered, the shielded cable is used or improved, and if the cable can be filtered, circuit filtering is adopted;
if the ferrite magnetic ring is sleeved, the improvement is not qualified, then the magnetic ring is added again, and the circuit filtering is utilized until the qualified result is achieved.
Compared with the prior art, the invention has the beneficial effects that: the invention starts from the root, reduces the radiation energy from the source, destroys or changes the path of radiation interference, reduces gaps, strengthens filtering, changes the position of a line to destroy a radiation mechanism, and can quickly and accurately carry out the radiation emission positioning adjustment and modification of the multi-user unit of the passive optical network.
Drawings
FIG. 1 is a schematic diagram showing the positions of the steps of the present invention in product testing.
FIG. 2 is a schematic flow chart of determining the source and propagation path of EUT according to the present invention.
FIG. 3 is a schematic diagram of a method for eliminating common mode current in a cable according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
EMI (electromagnetic interference) generation principle:
the electric field and the magnetic field are generated along with the action of voltage and current, mainly the change rates dI/dt and dv/dt of voltage and current in unit time are influenced, and the electric field and the magnetic field interference generated correspondingly is stronger if the dI/dt and dv/dt are higher.
The radiation propagation path of EMI (electromagnetic interference) noise is propagated by means of the characteristics of electric waves, electric fields and magnetic fields.
For EMI (electromagnetic interference) test rectification, the source and the coupling propagation path of EMI (electromagnetic interference) are determined
EMI (electromagnetic interference) countermeasure thought
(1) Starting from the root, the radiation energy is reduced from the source
For example, a resistor is connected in series to a clock crystal pin (crystal oscillator pin), and a resistor is connected in series to a clock line (clock line).
(2) Destroying or altering paths of radiated interference
The reduced coupling mechanism, which is usually the strongest interference when trace is λ/4 of the interfering signal frequency, can be modified to route or enhance filtering.
(3) Destruction of radiation mechanisms
Reducing gaps, strengthening filtering and changing the position of the line.
The invention thus provides several examples:
the invention discloses an embodiment of a passive optical network multi-user unit radiation emission positioning rectification method, which comprises the following steps: a radiation emission positioning and modifying method for a passive optical network multi-user unit comprises the following steps: diagnosing sources and propagation paths of the interference; carrying out safe grounding lapping on the EUT equipment to be tested; the unwanted frequency components are removed from the frequency domain through filtering, and the electromagnetic disturbance is reduced in both conduction and radiation aspects; suppressing various electromagnetic interferences propagating through a space by shielding; replacing the suspect component with a component that meets EMC electromagnetic compatibility requirements; for the crystal oscillator product, the output energy of the crystal oscillator and harmonic waves thereof is reduced by a method of connecting resistors in series or in parallel.
For an MDU, firstly, radiation interference confirmation is carried out according to a standard test method, a frequency point for testing Fail is found, then the influence of an equivalent radiation antenna, the influence of a path and the influence of Source (information Source) are judged according to the actual characteristics of the EUT tested equipment, and then corresponding measures are taken according to the influence generated by various factors.
Fig. 2 shows a preferred embodiment of the present invention, and the method for diagnosing the source and propagation path of interference is to find the maximum radiation direction, remove the peripheral signal lines, and determine the radiation interference strength of the power line of the EUT device under test itself to find the source and propagation path.
As a preferred scheme of the above embodiment, after peripheral signal lines are removed, if the frequency point exceeding EUT radiation is still high, the magnetic field probe is used to detect the intensity of noise interference of each main part component on the circuit board, and the electric field probe or the probe is used to detect the component pin connector of the main part, so that a spectrum analyzer and the electric field magnetic field probe can be used.
As a preferable scheme of the above embodiment, when diagnosing the source and the propagation path of the disturbance, it is checked whether the screws on the metal casing of the EUT device under test are screwed or not, and whether the grounding of the patch port is good or not.
As a preferable scheme of the above embodiment, when the peripheral signal line is removed, the power line is retained, and the non-removable signal line is judged by adding a ferrite magnetic ring.
Fig. 2 specifically shows a specific embodiment of the present invention, and the specific method for determining the power line radiation interference intensity of the EUT device under test to obtain the source and the propagation path is as follows:
after all redundant cables are pulled out, if the radiation is qualified, eliminating the problem of the common mode current of the cables, then connecting all the cables with equipment, judging whether the radiation is qualified, finishing the judgment if the radiation is qualified, and continuously eliminating the common mode current if the radiation is not qualified;
if the radiation is still unqualified after all the redundant cables are pulled out, a magnetic ring is added on the power line, the radiation is restrained after the magnetic ring is added, the common mode current is eliminated by using a processing filter, the elimination is finished if the radiation is qualified, and if the radiation is not restrained or unqualified after the magnetic ring is added, the shielding effect of the case is checked.
As shown in fig. 3, the method for eliminating the common mode current of the cable according to the present invention is to sleeve a ferrite magnetic ring on the cable, if filtering is not possible, the shielded cable is used or improved, and if filtering is possible, circuit filtering is adopted;
if the ferrite magnetic ring is sleeved, the improvement is not qualified, then the magnetic ring is added again, and the circuit filtering is utilized until the qualified result is achieved.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (4)
1. A radiation emission positioning and modifying method for a passive optical network multi-user unit is characterized by comprising the following steps:
the method for diagnosing the source and the propagation path of the interference comprises the steps of finding out the maximum radiation direction, removing peripheral signal lines, and judging the power line radiation interference intensity of the EUT to obtain the source and the propagation path; the specific method for determining the power line radiation interference strength of the EUT to obtain the source and the propagation path is as follows: after all redundant cables are pulled out, if the radiation is qualified, eliminating the problem of the common mode current of the cables, then connecting all the cables with equipment, judging whether the radiation is qualified, finishing the judgment if the radiation is qualified, and continuously eliminating the common mode current if the radiation is not qualified; if the radiation is still unqualified after all the redundant cables are pulled out, adding a magnetic ring on the power line, inhibiting the radiation after adding the magnetic ring, eliminating the common mode current by using a processing filter, completing the elimination after the elimination is qualified, and checking the shielding effect of the case if the radiation is not inhibited or unqualified after adding the magnetic ring;
carrying out safe grounding lap joint on the EUT in advance;
the unwanted frequency components are removed from the frequency domain through filtering, and the electromagnetic disturbance is reduced in both conduction and radiation aspects;
suppressing various electromagnetic interferences propagating through a space by shielding;
replacing the suspect component with a component that meets EMC requirements;
for the crystal oscillator product, the output energy of the crystal oscillator and harmonic waves thereof is reduced by a method of connecting resistors in series or in parallel.
2. The passive optical network multi-subscriber unit radiation emission location modification method according to claim 1, characterized in that: when the source and the propagation path of the interference are diagnosed, whether the EUT metal shell screw is screwed down or not is checked, and whether the grounding of the socket is good or not is checked.
3. The passive optical network multi-subscriber unit radiation emission location modification method according to claim 1, characterized in that: and when the peripheral signal line is removed, the power line is reserved, and the non-removable signal line and the ferrite magnetic ring are judged.
4. The passive optical network multi-subscriber unit radiation emission location modification method according to claim 1, characterized in that: the common mode current eliminating method of the cable is that a ferrite magnetic ring is sleeved on the cable, if the cable can not be filtered, the shielded cable is used or improved, and if the cable can be filtered, circuit filtering is adopted;
if the ferrite magnetic ring is sleeved, the improvement is not qualified, then the magnetic ring is added again, and the circuit filtering is utilized until the qualified result is achieved.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910288907.5A CN109819641B (en) | 2019-04-11 | 2019-04-11 | Multi-user unit radiation emission positioning and reforming method for passive optical network |
| PCT/CN2020/078941 WO2020207181A1 (en) | 2019-04-11 | 2020-03-12 | Radiated emission positioning rectification method for multi-user unit of passive optical network |
| KR1020207027618A KR20200127210A (en) | 2019-04-11 | 2020-03-12 | Method for calibrating the radiated emission position of multi-user units in passive optical networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910288907.5A CN109819641B (en) | 2019-04-11 | 2019-04-11 | Multi-user unit radiation emission positioning and reforming method for passive optical network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109819641A CN109819641A (en) | 2019-05-28 |
| CN109819641B true CN109819641B (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910288907.5A Active CN109819641B (en) | 2019-04-11 | 2019-04-11 | Multi-user unit radiation emission positioning and reforming method for passive optical network |
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| Country | Link |
|---|---|
| KR (1) | KR20200127210A (en) |
| CN (1) | CN109819641B (en) |
| WO (1) | WO2020207181A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109819641B (en) * | 2019-04-11 | 2020-12-11 | 太仓市同维电子有限公司 | Multi-user unit radiation emission positioning and reforming method for passive optical network |
| CN112996373A (en) * | 2019-12-12 | 2021-06-18 | 广州彩泰电子科技有限公司 | Comprehensive electromagnetic radiation prevention method for outdoor display equipment |
| CN112305500A (en) * | 2020-09-25 | 2021-02-02 | 苏州浪潮智能科技有限公司 | Positioning method and device of radiation emission source and electronic equipment |
| CN113567760A (en) * | 2021-07-23 | 2021-10-29 | 重庆金康动力新能源有限公司 | Method and device for rectifying generator controller, storage medium and computer equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102313851B (en) * | 2011-06-30 | 2013-05-15 | 重庆大学 | Method for testing electromagnetic interference propagation path of motor drive system of pure electric vehicle |
| US9323879B2 (en) * | 2014-02-07 | 2016-04-26 | Freescale Semiconductor, Inc. | Method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading introduced by hardware, computer program product for carrying out the method and associated article of manufacture |
| CN105514898B (en) * | 2015-11-27 | 2018-07-20 | 中国电力科学研究院 | A kind of magnet ring optimum organization method inhibiting electromagnetic scattering |
| CN106019023A (en) * | 2016-07-05 | 2016-10-12 | 广东中认华南检测技术有限公司 | Electromagnetic oven electromagnetic compatible optimization method |
| CN106499564B (en) * | 2016-12-14 | 2018-06-01 | 安徽江淮汽车集团股份有限公司 | A kind of method and engine igniting system for reducing vehicle broadband radiation |
| CN109819641B (en) * | 2019-04-11 | 2020-12-11 | 太仓市同维电子有限公司 | Multi-user unit radiation emission positioning and reforming method for passive optical network |
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2019
- 2019-04-11 CN CN201910288907.5A patent/CN109819641B/en active Active
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2020
- 2020-03-12 KR KR1020207027618A patent/KR20200127210A/en not_active Application Discontinuation
- 2020-03-12 WO PCT/CN2020/078941 patent/WO2020207181A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| CN109819641A (en) | 2019-05-28 |
| KR20200127210A (en) | 2020-11-10 |
| WO2020207181A1 (en) | 2020-10-15 |
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