Abstract
Since superconductors do not require voltages, a high-current power supply could run with low power if the voltage is sufficiently reduced. Even a battery-powered power supply could give as much as 2, 000A for a superconductor. To demonstrate this hypothesis, a battery-powered 2, 000A power supply was constructed. It uses an IGBT chopper and Schottky diode together with a specially arranged transformer to produce a high current with low voltage. Testing of 2, 000A operation was performed for about 1.5hr using 10 car batteries. Charging time for this operation was 8hr. Ramping control was smooth and caused no trouble. Although the IGBT frequency ripple of 16.6kHz was easily removed using a passive filter, spike noise remained in the output voltage. This ripple did not cause any trouble in operating a pancake-type inductive superconducting load.
