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Defeating Electrical Noise
The best time to handle electrical noise problems is before they occur. When a system is in the design process, the designer should consider the following set of guidelines for system wiring: [1] Put surge suppression components on all electrical coils: Resistor/capacitor filters, MOVs, Zener and clamping diodes. Shield all remote connections, use twisted pairs. Shields should be tied to Earth at one end. Put all microelectronic components in an enclosure. Keep noisy devices outside. Watch internal temperature. Ground signal common wiring at one point. Float this ground from Earth if possible. Tie all mechanical grounds to Earth at one point. Run chassis and motor ...
Next Big Thing Is…
[1] Archeologists estimate that modern humans have been on the Earth for about 200,000 years. Since then we have been experiencing the universe a routine like day/night, same four seasons in a year, birth-childhood-youth-reproduction-retirement-death. We have accepted it as a cycle repeating over and over. Even we do see our lives as a single fact, but in reality it is composed of countless repeating identical cycles in terms of micro scoping view. Matter or waves are made of series of micro scoping particles or chunk of energy. Similarly time is composed of series of micro scoping delays. The delay is ...
Motor Control EMI: AC Mains Conducted Emission
We do not want our product to come back from testing to find that we have failed electromagnetic interference (EMI) or conducted emissions (CE) exams. Furthermore, we do not want these noise sources to degrade our products performance, so we need to understand the mechanisms of this noise and how to minimize it. One of the most common failures is, AC mains conducted emission testing which is listed as IEC 61326-1:2005, Ed. 1 section 7 (CiSPR11:2003). The purpose of the conducted emissions test is to measure noise currents that exit the products ac power cord to be sure the currents ...
Do-nuts plus Engineers = Success
It was a typical Friday afternoon as everyone was rushing to finish their work load to get home early. As the day came to a close, my inbox alert pops up showing a meeting invite for early Monday morning from our Project Manager. Out of curiosity of the details contained within, I read the E-mail that was sent to all the Project Team members. It read, “If you like donuts, attend the meeting.” [1] Unfortunately, I don’t like donuts, but a certain anxiety came over me in wanting to know, what could the topic of discussion be? I could only think ...