Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-09-12
2006-09-12
Nguyen, Hoa T. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07106546
ABSTRACT:
A system controls the speed of a Voice Coil Motor (VCM) in order to perform the ramp loading of hard disk heads with low noise. This system includes a generator for generating a discontinuous PWM drive signal to a power stage. A sampling block is clocked by a synchronization signal issued from the generator and receives as an input a signal related to the electromotive force (Bemf) provided by the VCM motor. An adder node placed at the sampling block output receives a signal related to a reference electromotive force (Bemf_ref). A filtering block placed downstream of the adder node generates a power supply voltage signal to the power stage. The control system further includes a control block having at least one voltage divider and controlled switches. The control block is input the signal issued from the filtering block and control signals from the generator block to selectively operate the controlled switches and set the value of the power-on signal of the power stage.
REFERENCES:
patent: 6950272 (2005-09-01), Rice et al.
Jenkens & Gilchrist PC
Nguyen Hoa T.
Slavitt Mitchell
LandOfFree
System for controlling the speed of a voice coil motor (VCM)... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for controlling the speed of a voice coil motor (VCM)..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for controlling the speed of a voice coil motor (VCM)... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3577159