DocumentCode :
3638502
Title :
Average inductor current sensor for digitally-controlled switched-mode power supplies
Author :
Miguel Rodríguez;J. Sebastián;Dragan Maksimović
Author_Institution :
Power Supply Systems Group, Department of Electrical and Electronic Engineering, University of Oviedo. Campus de Viesques s/n, 33204 Gijó
fYear :
2010
Firstpage :
780
Lastpage :
787
Abstract :
Current-mode control in digitally-controlled switched-mode power supplies typically requires analog-to-digital (A/D) conversion of at least two signals, voltage and current. The complexity of voltage A/D converters can be reduced using window A/D techniques. In conventional current A/D conversion, however, relatively high resolution is required over a wide range of signals, which results in increased complexity, power consumption and cost of the controller. This paper proposes a very simple feedback sensor capable of high-resolution average inductor current sensing using two analog comparators and an analog low-pass filter. The approach requires very few external components and employs minimal digital hardware resources. A dynamic model and performance of the average inductor current sensor are experimentally verified on a 12 V input, 19 V output, 50 W boost converter prototype.
Keywords :
"Inductors","Converters","Current measurement","Transfer functions","Bandwidth","Steady-state","Voltage control"
Publisher :
ieee
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Print_ISBN :
978-1-4244-5286-6
Type :
conf
DOI :
10.1109/ECCE.2010.5617922
Filename :
5617922
Link To Document :
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