Troubleshooting Tips For EMC And Power Failures

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Hopefully if you are having EMC troubleshooting and power issues on your system, this article can help you fix them. An EMC crisis (or EMC problem) occurs when one electronic device and even one electromagnetic system is exposed to another. An example is the breakthrough in the high field strengths created by a new radio transmitter nearby.

[Editor’s Note: We are pleased to continue our series on important and sometimes overlooked electromagnetic compatibility (EMC) issues at the request of Daryl Gerke, an expert at Kimmel Gerke Associates. Note that links to all end entries in particular are here .]

This is the latest edition of the EMI / EMC troubleshooting mini series. Potential interference, often regarded as EMC’s stepson, is becoming more and more important.

At every level of design, we’ve seen very significant growth over the past few years, as well as disruptive power. These problems are addressed with improved power components that provide faster switching speeds, higher power levels and, unfortunately, increase EMI problems.

We have noticed an increase in problems with level faults, especially circuits. At the last IEEE EMC symposium in 2011, there was evenheld a special one day session on EMC and topics, I would say “Smart Grid”. The session was well integrated into the fun and generated a lot of discussion. As one wildcard remarked, “It seems like megawatts have finally hit the gigahertz. “

But back to design issues. Because of these issues, a wide range of products now have to undergo mandatory power source interference testing to ensure EMC compliance. Specific tests vary by industry, location, and even location. The variable does not intervene in the event of a power failure.

There appear to be electrical interference specifications for used electronic devices from industry (often country-specific), military platforms, vehicles, telecommunications equipment, commercial aircraft, etc. Most are unique in terms of environment and are mainly based on empirical data.

Some requests are part of the general EMC requirements, while others may be contained in separate docsentah. In the latter case, the general term is called “efficiency or quality”, PQ. While EMC requirements focus on transients, PQ requirements generally refer to longer excitation disturbances such as dips, overvoltage / undervoltage, power outages, etc.

The two most common industrial and commercial EMC requirements are EFT (Electrical Fast Transient) and lightning in a booming market. They apply to AC inputs. In the real world, humans are two of the most likely causes of device malfunction and damage. Other industries such as military, automotive and telecommunications have similar AC and DC power requirements.

EFT tests simulate arcs on coupled elements, resulting in short bursts associated with very fast transients. EFT is actually described in ANSI / IEEE C62.41; the same exact CE test requirement is EN61000-4-4. Separate transients use pr Confident rise time ns, which is approximately 1 ns nominal, to achieve ESD.

Surge testing simulates the rapid impact on the power grid. The increase is also described in C62 ansi / ieee.41; The equivalent CE test requirement is EN61000-4-5. Transients (existing and ongoing) are much slower and have much more energy than any EFT. As a result, problems and breakdowns are common.

An excellent resource for PQ on the North AC network is IEEE Std-1000, also known as The Emerald Book. Published by the Power iee Engineering Society, this guide focuses on cabling techniques for computing equipment. Thus, this article is a great place to start. We even used it as a basis for developing internal energy specifications.

There are impressive PQ specifications for other industries as well. Sometimes these are separate documents, and in some cases they are separate chapters in large specifications. Some of the European standards also deal with QP issues for European electrical networks.

There are probably two troubleshooting methods: power supply and faulty devices. You may need a combination of the two to isolate and solve the correct problem.

For forced failure, it is best to start with EFT and pulse testing. Start with discount levels and gradually increase them. And remember, power surges can hurt, so don’t play with a precious, one-of-a-kind prototype.

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Power Failure Analyzers (pdas) are very useful for verifying the health of a device. If you don’t have one, they can all be rented and built for a specific period of time. These devices check many parameters such as overvoltage / undervoltage, power outages, transients, etc. They date / time events and even capture waveforms for later evaluation.

Handheld Warning: To reduce bandwidth usage, you can skip events such as adding a secure oscilloscope to one along the way. The bandwidth must be over 100 MHz or more е.

Here are five tips for effective eating habits:

1. Add modular performance to the inlet filter system. If there is metal in the enclosure, make sure you are near the power input and provide a low resistance ground between the filter method and the enclosure.
2. Add temporary protection when you see the entrance. Install both differential and common mode devices. MOV is sufficient for power surges. EFT usually needs faster plastic with devices, short connections.
3. If emotional shock methods are encountered, try adding multiturn common-mode ferrite (3-4 turns through the core) to the input power line. Note that single turn ferrites may not be enough.
4. If the reset is due to a positive EFT, try adding a 0.01uF capacitor and multiturn ferrites directly to the reset circuit. The inputs are especially prone, but make sure the reset / voltage focus of the devices is also well decoupled on the IC.
5. When struck by lightning,damage to try to assess the unsuccessful strategy. Consider isolation transformers and transient enclosures that are designed to double the lightning surge levels.

At different times, all of the above. Then we will deal with some EMC shielding problems and solutions at any time.

Debugging: 9 Must-Have Rules for Finding Even the Most Elusive Additional Software and Hardware Issues (Chapter 5, Part III of 3) (and see previous related sections)

Daryl Gerke, 1 EMI / EMC since 1987 as a consultant with his business partner Bill Kimmel, specializes in engineering and troubleshooting (not testing, let alone regulatory requirements). Kimmel has been monitoring EMI issues (combined of course) for over 40 years. He is also a writer and columnist, and his EDN Designer’s Guide to EMC (1994) is still relevant and in demand. He can be contacted through http://www.emiguru.com or even another blog at http://www.jumptoconsulting.com/.

Risoluzione Dei Problemi Emc E Disturbi Di Alimentazione
Depannage Emc Et Perturbations De L Alimentation
Emc 문제 해결 및 전원 장애
Emc Probleemoplossing En Stroomstoringen
Solucao De Problemas De Emc E Disturbios De Energia
Emc Felsokning Och Stromavbrott
Ustranenie Neispravnostej Emc I Sboev Pitaniya
Rozwiazywanie Problemow Emc I Zaklocenia Zasilania
Solucion De Problemas De Emc Y Perturbaciones De Energia
Emv Fehlerbehebung Und Stromstorungen

Mohammed Butcher

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