Temperature invariant, magneto-optic modulator coil driving circ

Details Temperature invariant, magneto-optic modulator coil driving circ Temperature invariant, magneto-optic modulator coil driving circ

1993-06-17

1999-10-19

Nguyen, Hoa T.

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Magnetic field and light beam

360114, 360 59, 360 60, 360 66, G11B 1112, G11B 1304

Patent

active

059700262

ABSTRACT:
A magnetic modulator coil driving circuit comprises: first and second switching elements for inverting the polarity of exciting currents supplied to magnetic modulator coils, first and second bias voltage setting circuit for determining control voltages to be applied to the first and second switching elements to adjust the currents flowing through the first and second switching elements to a predetermined value, and a data input circuit for supplying modulating data to turn on and off the first and second switching elements alternately. The magnetic modulator coil driving circuit applies a control voltage to the control electrode of the corresponding switching element to control the exciting current to be supplied through the switching element to the corresponding magnetic modulator coil so that the exciting current coincides with a desired value when a reference voltage is applied to the control electrode. Thus a fixed exciting current is supplied to the magnetic modulator coil so that the intensity of the magnetic field may not vary due to temperature variation in the magnetic modulator coil and the magnetic modulator coil may not overheat or burn.

REFERENCES:
patent: 4631713 (1986-12-01), Romeas et al.
patent: 4748605 (1988-05-01), Sakai et al.
patent: 4750159 (1988-06-01), Yoda
patent: 4937802 (1990-06-01), Omori et al.
patent: 4987501 (1991-01-01), Hori
patent: 5067032 (1991-11-01), Ida
Patent Abstracts of Japan, vol. 14, No. 230 (P-1048), May 16, 1990 & JP-A-20 54 424 (Nippon Columbia), Feb. 23, 1990.
Froess, "Current Reversal in Inductive Loads", IBM Technical Disclosure Bulletin, vol. 11, No. 10, Mar. 1969, p. 1365.

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