Circuit and method for protecting emergency head-retract...

Details Circuit and method for protecting emergency head-retract... Circuit and method for protecting emergency head-retract...

2006-10-03

2006-10-03

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C320S166000

Reexamination Certificate

active

07116512

ABSTRACT:
A protection circuit for a capacitor comprises a voltage pump that selectively charges the capacitor. A current source selectively charges the capacitor. A controller selectively activates the current source while deactivating the voltage pump when a charging voltage is less than a threshold charging voltage level and selectively deactivates the current source while activating the voltage pump when the charging voltage is greater than the threshold charging voltage level.

REFERENCES:
patent: 5498951 (1996-03-01), Okamura et al.
patent: 5783928 (1998-07-01), Okamura
patent: 6020724 (2000-02-01), O'Loughlin
patent: 6204638 (2001-03-01), Nishioka et al.
patent: 6614134 (2003-09-01), Davies
patent: 2002/0141102 (2002-10-01), Kusumoto
patent: 2004/0251884 (2004-12-01), Steffie et al.

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