Power saving circuit arrangement for data transfer apparatus wit

Details Power saving circuit arrangement for data transfer apparatus wit Power saving circuit arrangement for data transfer apparatus wit

1985-02-07

1987-09-01

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 97, 318345B, G11B 1902

Patent

active

046912550

ABSTRACT:
A magnetic disk drive is disclosed which has a disk drive motor for imparting rotation to a magnetic disk, and a head transport motor for transporting a transducer head or heads radially of the magnetic disk for track to track accessing. The disk drive motor and the head transport motor are fed from a common direct current supply terminal via first and second switching transistors, respectively, which independently control power delivery to the two motors for effectively saving power. A voltage regulating capacitor is connected only between ground and the output line of the first switching transistor for the disk drive motor. In order to prevent the flow of a surge current due to the voltage regulating capacitor upon conduction of the first switching transistor, a conduction retarder is provided which causes a gradual conduction through the first switching transistor in response to an actuating signal from host equipment controlling the disk drive. The conduction retarder takes the form of a capacitor connected between the collector and base of the first switching transistor in one embodiment of the invention, and of a time constant circuit connected between the host equipment and the base of the first switching transistor in another embodiment.

REFERENCES:
patent: 4388572 (1983-06-01), Rosenfeldt

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