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Analog-to-digital converter for input voltage measurements in low-power digitally controlled switch-mode power supply converters

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4 Author(s)
Aleksandar Radić ; ECE Dept., Univ. of Toronto, Toronto, ON, Canada ; S. M. Ahsanuzzaman ; Amir Parayandeh ; Aleksandar Prodić

This paper introduces a practical analog-to-digital (ADC) converter architecture for the input voltage measurements in low-power digitally controlled switch-mode power supplies (SMPS). The ADC utilizes known reference voltage and a duty ratio of a simple circuit mimicking operation of the converter to obtain the information about the input voltage value. The functionality of the ADC is verified through a discrete implementation, with a 1.5 V/3 W buck converter based experimental prototype. A better than 1.5% accuracy is observed over the entire 1.8 V to 3.3 V input voltage range. A small silicon size of about 0.025mm2 is also estimated, based on the synthesized digital logic and already existing on-chip integrated system functional blocks.

Published in:

Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on

Date of Conference:

Aug. 30 2011-Sept. 1 2011