Time domain design of digital compensators for PWM DC-DC converters

Author

Peretz, Mor Mordechai ; Ben-yaakov, Sam

Author_Institution

Power Electronics Laboratory, Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, ISRAEL. Phone: +972-8-646-1561; Fax: +972-8-647-2949, Email: morp@ee.bgu.ac.il

fYear

2007

fDate

Feb. 25 2007-March 1 2007

Firstpage

887

Lastpage

893

Abstract

A time-domain design method for digital controller of PWM DC-DC converters that was developed, tested by simulations and verified experimentally. The proposed approach is based on the fact that the closed-loop response of a digitally controlled system is largely determined by the first few samples of the compensator. This concept is used to fit a digital PID template to the desired response. The proposed controller design method is carried out in the time domain and thus, bypasses errors related to continuous to discrete domain transformation and discretization. Digital PID controllers for a Buck and Boost type converters were implemented experimentally on a TMS320LF2407 DSP core. The measured closed-loop attributes were 3.5KHz bandwidth and phase margin of 40Â° for the Buck converter, and 1.6 KHz and 40Â° for the Boost. Good agreement was found between the design goals and the experimentally determined response.

Keywords

Control systems; DC-DC power converters; Design methodology; Digital control; Error correction; Pulse width modulation; Pulse width modulation converters; Testing; Three-term control; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference, APEC 2007 - Twenty Second Annual IEEE

Conference_Location

Anaheim, CA, USA

ISSN

1048-2334

Print_ISBN

1-4244-0713-3

Type

conf

DOI

10.1109/APEX.2007.357620

Filename

4195824