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  • 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
  • Siemens Energy Optimises Power Transformers with the Aid of 3D EM Simulation
    It is difficult to obtain off-the-shelf solutions for furnace and converter transformers as well as transformers for High Voltage Direct Current for ratings greater than 200 MVA. Siemens Energy uses 3D EM simulation in the optimisation process of transformer installations.
  • 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
  • Sychronous Rectification
    Synchronous rectification (SR) is used in DC/DC converters when low output voltage is less than 5V and high current is needed. Synchronous rectification utilizes power MOSFETs to rectify the output voltage of the power transformer. These MOSFETs are synchronized to the converter frequency
  • Solid-state relays
    through the coil of a reed relay. Closure of the reed switch triggers the thyristor into conduction. Transformer-coupled SSRs send an ac control signal through the primary of a small transformer. (In the case of dc control signals, the input first goes through a dc/ac converter before hitting
  • Circuit Ideas: High-efficiency dc/dc conversion
    a resonant-reset forward converter with synchronous rectification. It is frequently found in isolated industrial and telecom applications. A key component that determines conversion efficiency in these circuits is the resonant capacitor C . It facilitates zero-voltage turn-off of a MOSFET switch
  • What Is So Great About Synchronous Rectification?
    Figure 1A shows a block diagram of a forward converter with an SDSR output. The SDSR consists of Q2 and Q3, which are directly driven from the secondary of the power transformer T1. The timing diagram and the associated voltage and current waveforms of Figure 1A are given in Figure 1B. Referring
  • Flexible Solutions for Isolated AC Line Monitoring
    Isolated ADCs are essential for applications where the power drawn from the ac mains must be monitored. The most common solution for these applications today uses a current transformer coupled with discrete components and a data converter - a bulky approach that drives up the size and complexity

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