High precision current tracking PWM amplifier with optimal type 1 digital controller for generating magnetic field in MRI systems

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High precision current tracking PWM amplifier with optimal type 1 digital controller for generating magnetic field in MRI systems

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  • DOI:  10.1049/cp:19980565
  • ISBN: 0 85296 704 7
  • Location: London, UK
  • Conference date: 21-23 Sept. 1998
  • Format: PDF
This paper presents a two-paralleled PWM amplifier using switch-mode power current tracking technique in order to generate a gradient magnetic field in a magnetic resonance imaging (MRI) system. This circuit has 8-IGBTs at their inputs/outputs so as to realize further high-power density. A digital control scheme can minimize the current ripple and improve its control response in the gradient coils. It is proved that the proposed technique will highly enlarge the diagnostic target and improve the image quality of MRI.

Inspec keywords: power semiconductor switches; PWM power convertors; insulated gate bipolar transistors; power amplifiers; electric current control; power bipolar transistors; biomedical NMR; switched mode power supplies; coils; digital control

Subjects: Current control; Bipolar transistors; Control of electric power systems; Inductors and transformers; Biological and medical control systems; Amplifiers; Radiation and radioactivity applications in biomedicine; Control engineering computing; Medical magnetic resonance imaging and spectroscopy; Insulated gate field effect transistors; Patient diagnostic methods and instrumentation; Power convertors and power supplies to apparatus; Biology and medical computing

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