Controlled source of current

Details Controlled source of current Controlled source of current

1984-04-19

1987-05-26

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Using a three or more terminal semiconductive device as the...

323351, 320 1, 307109, G05F 100

Patent

active

046689044

ABSTRACT:
The invention relates to a controlled source of current (1) having an inductive load (3), particularly a gradient coil adaptable to a nuclear spin imaging assembly. In order to cut down the reversal time of a current flowing in the load, the circuit is provided, according to the invention, with controlled energy storage instruments (2) connected in series with source of current (1) and inductive load (3) for increasing the rate of conversion of energy stored in said inductive load (3). Said instruments (2) preferably comprise capacitor means (C1, C2) and switch means (F1 . . . F4) for controlling the capacitors, facilitating a quick transfer of energy into or out of load (3). Said switch means (F1 . . . F4) are controlled by means of instruments (6) sensing a current flowing in inductive load (3), the conversion of energy being thus accurately controlled.

REFERENCES:
P. A. Bottomley, Rev. Sci. Instrum., 53 (9), Sep. 1982, pp. 1319-1337.
C-M Lai et al, Chem., Biomed., Environ. Instrumentation, 9(1), 1-27, 1979, pp. 1-27.
J. M. S. Hutchinson et al., J. Phys., E.: Sci. Instrum., vol. 11, 1978, pp. 217-221.

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