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  • Technical Article: The Ferroresonant Transformer Voltage Regulator
    The ferroresonant transformer or constant voltage transformer has a very long history having been invented in 1938 by Joseph Sola and continuing to sell tens of thousands of units per year. The ferro of today has had some minor improvements but remains fundamentally unchanged from the original
  • Comparative Test of Low Voltage Lighting Transformers
    Landscape Lighting transformers differ greatly in design, construction and performance. To demonstrate the importance of these differences, a team of electrical engineers were asked to compare two transformers that are commonly used in Landscape Lighting installations. The transformers used
  • Transformer Design for Charging Defibrillator Capacitors
    transformer design phase for charging a capacitor in a stated time. The procedure presented eliminates "cut and try" or over-design approaches. Selection of critical values can be made with confidence using the guidance provided. First a little background in flyback topology. Flyback topology has
  • Wound Primary Current Transformers
    transformers as it makes the problems of the higher voltages easier for the design engineer to cope with, while keeping the design as cost effective as possible.
  • The case for custom transformers
    a single voltage. So equipment that needs multiple voltages may end up with many power cabinets as are visible atop this equipment enclosure. One custom-designed combination transformer in a single cabinet now takes over all the duties of the original transformers. A new custom transformer
  • Transformer Basics (.pdf)
    There is more than meets the eye in the insulation employed in transformers. Among the. design and construction considerations are temperature and voltage ratings. To those unfamiliar with transformer manufacturing, terms such as fish, kraft, natural fiber and gum might sound like the main
  • PC Mount Transformers
    PC mount transformers offer a small footprint for the design engineer looking to measure sensor current or voltage on a computer board. Applications for PC mount transformers include sensing current overload, ground fault detection, metering, isolated current feed-back signal in switch-mode power
  • Isolation Transformers Increase Safety of Electronic Systems (.pdf)
    in the equipment. Isolation transformers have represented a traditional solution for providing high isolation in electronic circuitry. Even with the increased use of efficient, switched-mode power supplies (SMPS), isolation transformers can improve the overall isolation of an electronic design without
  • Harmonics and Harmonic Mitigating Transformers (HMTs): FAQs
    and how does it generate harmonics? 5. Can't equipment manufacturers design their products to be free of harmonics? 6. What problems do non-linear loads and harmonics create? 7. Why do 3rd harmonic currents overload neutral conductors? 8. How do non-linear loads create current and voltage harmonics?
  • Caging Transformer: EMI Still An Important Design Issue (.pdf)
    of electromagnetic energy if poorly constructed or improperly integrated into the equipment. Thus, it should come as no surprise that power transformers, which handle high voltages and currents and produce strong electromagnetic fields, have the ability to deliver energy into the surrounding environment.

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