Control of a superconducting coil by a MOSFET power converter operating at near liquid nitrogen temperature

Author

Ise, Toshifumi ; Murakami, Yoshishige

Author_Institution

Dept. of Electr. Eng., Osaka Univ., Suita, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

2020

Lastpage

2023

Abstract

The on-resistance of a power MOSFET has a minimum value at around 80 K. This characteristic was utilized in order to operate a power converter circuit using power MOSFETs in a cryostat with a superconducting coil. As a result, it was confirmed that power losses of the chopper circuit and the size of the current leads can be greatly reduced. The power loss of the circuit was half of that at room temperature, and the loss can be reduced further by using diodes with lower on-voltages at low temperatures. The size of the current leads was reduced by using the chopper circuit as a DC transformer

Keywords

choppers (circuits); electric current control; field effect transistor circuits; power convertors; superconducting magnets; 80 K; DC transformer; MOSFET power converter; chopper circuit; cryostat; current control; current lead size; power converter circuit; power losses; superconducting coil; Charge carrier density; MOSFET circuits; Nitrogen; Power MOSFET; Power semiconductor devices; Power semiconductor switches; Power supplies; Superconducting coils; Temperature; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133603

Filename

133603