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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
  • 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
  • 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
  • Technical Article: Ferroresonant Transformer Advantages & Disadvantages
    The ferro voltage regulator, by its unique design, provides good isolation of load equipment from line noise and surges. The output voltage regulation is also smooth so long as the manufacturer has taken steps to minimize the distortion that is caused by operation in the saturation region. Ferro
  • Design and Development of Medical Electronic Instrumentation
    for. compliance with safety standards. Projects include the design of an isolated biopotential. amplifier, transformer-coupled analog isolator module, carrier-based optically coupled analog. isolator, linear optically coupled analog isolator with compensation, isolated eight-channel. 12-bit analog
  • 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
  • Switching power supply design rules
    in a full-resonant converter. When the main switch, Q1, turns on, about a half cycle of current flows through the switch, transferring the energy from the input source to an LC circuit composed of Lr and Cr. The transformer here provides voltage scaling, electrical isolation from primary to secondary
  • Basic Output Generator Excitation and Demodulation Requirements for USD Gyroscopes
    variations of this basic variable transformer design used in various gyroscope designs. All transformer based pickoffs however, operate in the same fundamental manner. As in all typical transformers, AC voltage, or excitation, is supplied to the pickoff transformer primary winding. From the secondary
  • 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
  • 30 V, 2 A High Efficiency CVCC LED Driver
    was merely ratioed from the. secondary winding on the original 55 V transformer design. to meet the new voltage and current requirements. The. primary winding, required inductances, and overall. construction are essentially the same.
  • Circuit Ideas: High-efficiency dc/dc conversion
    magnetism to go to zero during the time available. Reset time is that during which the transformer voltage is not being controlled by the primary switch or the active forward rectifier in the secondary. There are two inductances of concern for efficiency considerations: the primary inductance L
  • Common-Mode Filters For DC/DC Converters
    Switching noise generated from a DC/DC converter appears at both the input and output terminals. The parasitic capacitance of the power transformer, printed circuit board (PCB) and case will couple voltage 'spikes” between input and output. The spike generator in a DC/DC converter can be identified

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