Coil switching device

Details Coil switching device Coil switching device

1989-03-15

1991-05-14

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 67, 360 68, G11B 15087

Patent

active

050161229

ABSTRACT:
A device for switching a coil between a first state where it is connected between a supply source and the ground through an impedance and a second state where it is connected between an output terminal and the ground, a first switch (T.sub.REC) being arranged between the output terminal and the supply source. This switching device comprises: a diode (14) connected between the output terminal (16) and the supply source, a controlled switch (T.sub.PB) connected in parallel with the impedance between a second terminal of the coil and the ground, and a detection and control means (20, 24) connected between the diode and the power supply source for detecting the time when the voltage between the diode and the ground becomes equal to a predetermined value lower than the forward voltage drop across the diode and for thereby controlling said switch.

REFERENCES:
patent: 3824623 (1972-12-01), Gucker
patent: 3869717 (1974-02-01), Kawada et al.
patent: 4044387 (1975-09-01), Watkins et al.
patent: 4198664 (1978-03-01), Yasunaga et al.
patent: 4605974 (1986-08-01), Ochi et al.
patent: 4665446 (1987-05-01), Takayama
S. D. Keidl, "Multiple Head Read/Write and Head Select Circuit", IBM Technical Disclosure Bulletin, vol. 17, No. 8 (Jan. 1975), pp. 2415-2417.

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