Power supply for an inductive user, particularly a gradient coil

Details Power supply for an inductive user, particularly a gradient coil Power supply for an inductive user, particularly a gradient coil

1987-06-04

1988-03-22

Salce, Patrick R.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

361152, 307268, 324322, H02M 7538

Patent

active

047333421

ABSTRACT:
Exactly defined current pulses having high edge steepness and high final value are required for the pulse-like generation of high magnetic fields in inductive users. Particularly in nuclear magnetic resonance tomography, such pulses serve the purpose of building up a topically variable magnetic field with an optimally linear field strength gradient. A power supply for generating such current pulses includes a series connection of a stepping voltage switch and a variable voltage source, whose resultant output voltage is applied to the inductive by a voltage commutator user with a suitable operational sign for the build-up or dismantling of the individual pulses. A switching and regulating circuit controls the stepping switch, the variable voltage source and the voltage commutator dependent on prescribed rated curves of the pulses, such that the pulses have a rise and decay time independent of the final value.

REFERENCES:
patent: 3473040 (1969-10-01), Cominassi et al.
patent: 4203151 (1980-05-01), Baker
patent: 4208711 (1980-06-01), Baker
patent: 4238820 (1980-12-01), Naaijer
patent: 4410926 (1983-10-01), Hafner et al.
patent: 4470095 (1984-09-01), Donig

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