Digital current control using a switching power amplifier and sigma delta modulation

Author

Wurmsdobler, P. ; Jorgl, H.P. ; Buyle, M.

Author_Institution

Inst. for Machine & Process Autom., Vienna Univ. of Technol., Vienna, Austria

fYear

1997

fDate

1-7 July 1997

Firstpage

93

Lastpage

98

Abstract

In this paper a new method for driving a switching power amplifier by use of sigma delta modulation is proposed. After an explanation of the principles of sigma delta modulation the digital control concept is presented. The conventional solution by means of both, digital to analogue conversion and pulse width modulation is replaced by a pure digital one. A digitally implemented sigma delta modulator directly drives a switching power amplifier. Experimental results show the success of this concept in controlling the current in an active magnetic bearing for the lévitation of an iron ball.

Keywords

digital control; digital-analogue conversion; electric current control; magnetic bearings; power amplifiers; sigma-delta modulation; active magnetic bearing; digital control concept; digital current control; digital-to-analogue conversion; iron ball levitation; pulse width modulation; sigma delta modulation; switching power amplifier; Coils; Frequency modulation; Noise; Sigma-delta modulation; Switches; Digital current control; active magnetic bearing; power amplifier; sigma delta modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Conference (ECC), 1997 European

Conference_Location

Brussels

Print_ISBN

978-3-9524269-0-6

Type

conf

Filename

7082074