∑Δ ADC based current mode power supply controller with digital voltage loop

Author

Miao, Botao ; Bakker, Anton ; Soldano, Marco ; Daly, Brendan

Author_Institution

ECE Dept., Univ. of Colorado, Boulder, CO

fYear

2008

fDate

24-28 Feb. 2008

Firstpage

1582

Lastpage

1588

Abstract

Sigma-delta (SigmaDelta) modulators offer cost advantages in digitally controlled power supplies. Due to its noise shaping, high resolution, high speed ADCs and DACs are not necessary for digital control. This paper presents a low cost current-mode controller. The outer voltage loop is digital with SigmaDelta modulator and low resolution DAC. The inner current loop is kept analog with analog comparator and SR latch. An experimental circuit includes a SigmaDelta modulator test chip, a controller implemented on an FPGA, and a 30 V-to 3.3 V 10 W fly-back converter operating at 100 kHz. Experimental results demonstrate this mixed structure is a suitable solution for digital power supplies.

Keywords

digital control; electric current control; power control; power convertors; power supply circuits; sigma-delta modulation; ADC; FPGA; SR latch; analog comparator; analog-to-digital conversion; current mode power supply controller; current-mode controller; digital control; digital power supplies; digital voltage loop; fly-back converter; sigma-delta modulators; Circuit testing; Costs; Current supplies; Delta-sigma modulation; Digital control; Digital modulation; Noise shaping; Power supplies; Strontium; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE

Conference_Location

Austin, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-1873-2

Electronic_ISBN

1048-2334

Type

conf

DOI

10.1109/APEC.2008.4522936

Filename

4522936