Title :
A switching current-mode power stage based on sigma-delta modulation
Author :
Dallago, Enrico ; Passoni, Marco ; Sassone, Gabriele ; Venchi, Giuseppe
Author_Institution :
Power Electron. Lab. & Dept. of Electr. Eng., Pavia Univ., Italy
fDate :
6/23/1905 12:00:00 AM
Abstract :
An integrated current-mode switching power stage for hard-disk drive voice-coil motors is presented. In this system the current in the voice-coil is directly regulated by a sigma-delta modulator. Because of its nature the sigma-delta modulator does not need an external control loop so that a single loop system is obtained. The output stage employs a H-bridge and uses the zero voltage transition commutation technique to control the slope of the output voltage. Output voltage slope control is a basic requirement for the application in order to prevent interference with the hard disk drive signal circuitry. Preliminary experimental results on a prototype are presented
Keywords :
bridge circuits; commutation; current-mode circuits; disc drives; electric current control; motor drives; power convertors; power supplies to apparatus; sigma-delta modulation; switched mode power supplies; switching circuits; voltage control; H-bridge topology; HDD motor; hard-disk drive voice-coil motors; magnetic head position control; output voltage slope control; sigma-delta modulation; single loop system; switching current-mode power stage; zero voltage transition commutation; Circuits; Control systems; Current control; Delta-sigma modulation; Hard disks; Prototypes; Pulse width modulation; Pulse width modulation converters; Signal generators; Voltage control;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957556
