Date of Graduation

7-2021

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering (MSEE)

Degree Level

Graduate

Department

Electrical Engineering

Advisor/Mentor

McCann, Roy A.

Committee Member

Balda, Juan C.

Second Committee Member

Joshi, Piyush

Third Committee Member

Luo, Fang

Keywords

Particle accelerators; Power supplies; Superconducting magnet test; Superconducting magnets; Superconductivity

Abstract

Particle accelerators require high-precision magnetic fields on the order or 100ppm or less. This implies that the precision of the associated electrical current in the electromagnet that generates these fields should be smaller than 100ppm. However, conventional switching power supplies cannot offer this precision due to the frequency limitation of the switches. This research considers the use of power electronics devices operating in a linear as an alternative solution to meet the requirements of particle accelerator electromagnets.

This thesis presents the study of an insulated-gate bipolar transistor (IGBT) driver using a new control method that linearizes the IGBT’s collector-emitter voltage (???) gain. This allows the use of the IGBT in its linear region. This enables the implementation of an active filter as part of the superconducting magnet test facilities within the Superconducting Magnet Division (SMD) at Brookhaven National Laboratory (BNL). The IGBT driver and active filter incorporate a dual feedback loop topology to control IGBT modules and achieves improved capability in achieving precise control of electromagnet currents. This approach allows the use of commercially available IGBT devices that are normally optimized to work as switches.

The design, simulation, prototyping, and test results of an IGBT driver using the proposed dual-loop feedback approach is performed using MITSUBISHI CM1000-24H IGBTs, LabVIEW software and National Instruments Compact RIO hardware. Experimental results are presented that confirm the effectiveness of the proposed method.

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