Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1997-09-12
2000-04-18
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327110, 327588, 360 46, 360 68, H03K 1774
Patent
active
060520175
ABSTRACT:
A method and apparatus, for applying a current to a coil of a write head assembly of a disk drive, or the like, to cause the flux within the coil to rapidly reverse, has an H-bridge having two pair of two switchable transistors. Each pair of the transistors is connected between a supply voltage and a reference potential, and is adapted to be connected to the coil between the two transistors of each pair. The two transistors of the first pair may be connected to receive a control signal to turn on complementary transistors of the first and second pair of transistors to selectively control current flow in the coil in first or second directions. A reference current source supplies a reference current, and one of the transistors in each of the first and second pairs of transistors is connected when turned on to mirror the reference current to control the currents in the coil. First and second parallel transistors are connected in parallel respectively with the mirror transistors, the first and second parallel transistors being connected to be turned on respectively by the control signal and the inverted control signal concurrently with the respective mirror transistor. A pair of timing elements turn off respective ones of the parallel transistors after a predetermined time so that when the parallel transistors are turned on, the current in the coil overshoots a value established by the mirror transistors.
REFERENCES:
patent: 4454454 (1984-06-01), Valentine
patent: 4535203 (1985-08-01), Jenkins et al.
patent: 5221881 (1993-06-01), Cameron
patent: 5285135 (1994-02-01), Carobolante et al.
patent: 5297024 (1994-03-01), Carobolante
patent: 5332954 (1994-07-01), Lankin
patent: 5566369 (1996-10-01), Carobolante
patent: 5642065 (1997-06-01), Choi et al.
patent: 5712536 (1998-01-01), Haas et al.
patent: 5757215 (1998-05-01), Schuelke et al.
patent: 5841603 (1998-11-01), Ramalho et al.
patent: 5867334 (1999-02-01), Soichi et al.
patent: 5869988 (1999-02-01), Jusuf et al.
Irwin, "Maximum Average Power Transfer," Basic Engineering Circuit Analysis, 3d ed., pp. 453-454, date: Jan. 1990.
Pedrazzini, "IBM's Hard Disk Drive Load/Unload Technology,"Computer Data Storage Newsletter, Jul. 1997, vol. 10(7), Issue No. 114, p. 12.
Alegre de la Soujeole Axel
Pakriswamy Elango
Pidutti Albino
Carlson David V.
Galanthay Theodore E.
Jorgenson Lisa K.
Nguyen Minh
STMicroelectronics Inc.
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