Study of power diodes used for MRI applications

Ajit Nandawadekar; Mukhtiar Singh; Soumen Kar

Study of power diodes used for MRI applications

Ajit Nandawadekar

Mukhtiar Singh

Soumen Kar

Vol. 24, No. 2, pp. 316-323, Feb. 2024

10.1007/s43236-023-00728-7

Power diode

PCS

Superconducting magnet

Persistent mode operation

Abstract

Rectifier diodes play a vital role in the operational aspects of a superconducting magnet, and their selection and characterization are crucial for optimal performance and reliability. These diodes are placed within the magnet cryostat, which subjects them to liquid helium (4.2 K) or cryogenic temperatures. The behavior of power diodes can change significantly at cryogenic temperatures. Hence, it is essential to verify their performance before they are installed onto a superconducting magnet system. Thus, a test bench was developed to determine the V-I characteristics of power diodes at low temperatures. In this paper, the two power diodes were tested at 300 K, 77 K, and 4.2 K. The forward voltage was found to increase and have a modest reduction in the on-resistance with the decreases in temperature. The diodes withstood low temperatures down to 4.2 K. The observed forward voltage for the power diode was 4.78 V at 4.2 K, which is around 6-7 times higher than that at room temperature.

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Cite this article

[IEEE Style]

A. Nandawadekar, M. Singh, S. Kar, "Study of power diodes used for MRI applications," Journal of Power Electronics, vol. 24, no. 2, pp. 316-323, 2024. DOI: 10.1007/s43236-023-00728-7.

[ACM Style]

Ajit Nandawadekar, Mukhtiar Singh, and Soumen Kar. 2024. Study of power diodes used for MRI applications. Journal of Power Electronics, 24, 2, (2024), 316-323. DOI: 10.1007/s43236-023-00728-7.