The use of a high-T, YBaCuO superconducting film as a switch element of a rectifier was investigated. It was shown that a film can work as a controlled switch at a frequency up to 20 Hz, at current "4 A and voltage "4 V with current-stimulated quench. Film performance in the switch mode was calculated and theories and experiments were compared. Based on high-T, films it is possible to develop superconducting rectifiers that can work at the temperature of liquid nitrogen.
The increase of the operation frequency of superconducting converters up to 50 Hz opens new ways to improve their parameters. Thermally controlled switches using NbTi foil are able to operate at industrial frequency with reasonable efficiency and dynamic parameters. Such switches have been developed and tested. The paper presents experimental results of static and dynamic behavior of the switches. The rectification mode was tested with different shapes of the applied voltage, with currents from 150 to 450 A, voltages from 10 mV to 2.5 V and recovery times between 1 and 10 ms. The switches presented here have experimentally demonstrated superior dynamic parameters at higher efficiency than the ones reported in literature up to now.
Abstract-A full-wave thermally switched superconducting rectifier, able to operate directly from the mains at the 50-60 Hz frequency, has been developed in our institute. Typical design output values of this device are: current 300 A, voltage up to 1 V, average power up to 100 VA and an efficiency better than 95 %. The rectification is achieved by means of fast-response switches and an iron core transformer. A simple and reliable algorithm for the rectifier operation, based on the measured current change across the switches, is developed and tested while powering a small magnet. The new features of the rectifier presented allows for a simplification of the construction and a significant reduction of cost, mass and volume.
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