High speed driving circuit for magnetic head effective against f

Details High speed driving circuit for magnetic head effective against f High speed driving circuit for magnetic head effective against f

1993-10-07

1995-01-03

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

327110, H02M 324, H03K 301

Patent

active

053792084

ABSTRACT:
A driving circuit for a magnetic head incorporated in a disk memory system comprises a signal source unit for producing a pair of primary driving pulse signals complementary to each other, a level shifter for producing a pair of secondary driving pulse signals complementary to each other, a switching network responsive to the primary and secondary driving pulse signals for alternating the direction of current flowing into the magnetic head and a controller operative to detect the leading edge of one of the primary driving pulse signals for providing an auxiliary current path in every transient period for changing the direction of current, and the switching network is implemented a bridge circuit, i.e., four bipolar transistors respectively responsive to the primary and secondary driving pulse signals, wherein the auxiliary current path allows one of the secondary driving pulse signals to be temporally pulled down for keeping the associated bipolar transistor off against a positive going flyback pulse, thereby decreasing the current consumption without sacrifice of the switching speed.

REFERENCES:
patent: 4937802 (1990-06-01), Omori et al.
patent: 5155387 (1992-10-01), Fletcher et al.
patent: 5280196 (1994-01-01), Shinozaki

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