Title :
∑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
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;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-1873-2
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2008.4522936
