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An Efficient Zero Current Switching Control for L-Based DC-DC Converters in TEG Applications

This brief presents an improved zero current switching (ZCS) control for a high-gain inductor-based dc-dc converter targeting thermoelectric generator for wearable electronics. The proposed ZCS control is an all-digital circuit that utilizes a simple finite state machine and a 3-bit counter to locat...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2017-03, Vol.64 (3), p.294-298
Main Authors: Alhawari, Mohammad, Mohammad, Baker, Saleh, Hani, Ismail, Mohammed
Format: Article
Language:English
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Summary:This brief presents an improved zero current switching (ZCS) control for a high-gain inductor-based dc-dc converter targeting thermoelectric generator for wearable electronics. The proposed ZCS control is an all-digital circuit that utilizes a simple finite state machine and a 3-bit counter to locate the zero current point. In addition, an efficient push-pull circuit along with delay capacitance banks is used to tune the delay near the zero current point to reduce the estimated error. The proposed control circuit achieves 56 delay steps using 3 control bits while having a high resolution, which helps in maintaining the efficiency of the converter. The prototype chip is fabricated in 65-nm CMOS and occupies an area of less than 0.04 mm 2 . The measured results of the converter confirm 81% peak efficiency at 55-μW output power and 50-mV input voltage.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2016.2558110