Electricity: motive power systems – Positional servo systems
Patent
1993-10-18
1995-12-05
Ip, Paul
Electricity: motive power systems
Positional servo systems
318561, 318254, 318138, 318 40, 360 53, 360 7708, H02P 540, H02P 602
Patent
active
054732387
ABSTRACT:
A disc drive circuit includes a pair of DC busses across which are directly connected a disc actuator power amplifier and a three phase spindle motor power amplifier which may be comprised of three circuit branches, each branch having two NMOS transistors connected in series with the junction therebetween connected to one of three spindle motor terminals. A transistor switch is connected between a DC supply source and the DC busses for disconnecting the busses from the voltage source only when the supply voltage drops below a nominal operating voltage range. In one embodiment a full wave diode rectifier is also directly connected across the pair of busses and further connected to the three motor terminals, whereby when the switch is open the back e.m.f. of the free spinning spindle motor energizes the actuator amplifier enabling parking of the actuator heads. In another embodiment the drain to channel regions of the six NMOS transistors are adapted to assume the role of a full wave rectifier. In a third embodiment, added circuitry transforms the NMOS transistors into six simulated diodes to serve as a very efficient full wave rectifier only when the switch opens.
REFERENCES:
patent: 4417164 (1981-06-01), Edlund
patent: 4639798 (1987-01-01), Harrison et al.
patent: 4658308 (1987-04-01), Sander
patent: 4679102 (1987-07-01), Wevers et al.
patent: 4933785 (1990-06-01), Morehouse et al.
patent: 5050016 (1991-09-01), Squires
patent: 5062023 (1991-10-01), Squire
patent: 5095254 (1992-03-01), Ueki
patent: 5121262 (1992-06-01), Squires et al.
patent: 5128568 (1992-07-01), Carpenter
patent: 5204593 (1993-04-01), Ueki
patent: 5218253 (1993-06-01), Morehouse et al.
patent: 5258695 (1993-11-01), Utenick et al.
Latham, II Paul W.
Scheller Peter K.
Allegro Microsystems Inc.
Ip Paul
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