Abstract
Power converters for superconducting magnet of DC use are of large current and low voltage because of the low resistance of a superconducting magnet. In case of quick change of magnet current, power converters of large current and high voltage, that is large capacity, are needed due to the large time constant of the magnet.
We have studied on power supplies for superconducting magnets which consists of a small power converter, a superconducting magnet for an energy storage, and an energy transfer circuit of inverter converter bridges (ICB). Energy change at a quick change of magnet current is supplied from the storage magnet through the energy transfer circuit.
We derived analytical solutions on the basic characteristics of ICB energy transfer circuits. From the analytical solutions, a new control method of ICB trannsfer circuit to reduce voltage ripples across a load superconducting magnet was proposed and discussed.
In this paper, the power supply of the proposed type which was designed and made is shown. The basic characteristics and the control methods of the test system are explained briefly. The results of fundamental tests using normal-conducting magnets are shown and discussed. Availabilities of the proposed control method were confirmed by the experimental studies.
