A high efficiency buck converter for IoT sensors

With the surge in Internet of Things (IoT) applications, from smart homes to Industry 4.0 and healthcare, there's a critical need for power-efficient DC-DC converters to support the wide operational spectrum of IoT devices, especially those powered by Li-ion batteries. Powering a vast network o...

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Main Author: Mo, Mingwei
Other Authors: Siek Liter
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/174763
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1747632024-04-12T15:46:38Z A high efficiency buck converter for IoT sensors Mo, Mingwei Siek Liter School of Electrical and Electronic Engineering ELSIEK@ntu.edu.sg Engineering With the surge in Internet of Things (IoT) applications, from smart homes to Industry 4.0 and healthcare, there's a critical need for power-efficient DC-DC converters to support the wide operational spectrum of IoT devices, especially those powered by Li-ion batteries. Powering a vast network of IoT devices presents challenges due to their limited battery capacity and the impracticality of frequent battery replacements. IoT sensors mostly operate in sleep mode, so the DC-DC converter's load current can drop to the microampere level. When the system is activated for data collection and processing, the load current may spike to tens of milliamperes. Thus, it's essential for the DC-DC converter to accommodate a broad spectrum of load currents, ensuring versatility and reliability in various operational states. This dissertation presents the design of a buck converter implemented in a Global Foundries (GF) 55nm CMOS process for IoT sensor applications. The converter accommodates the full 2.5V to 4.2V input voltage range of Li-ion batteries and generates a 1.2V output voltage with a load current in the range of 10 μA to 100 mA, which is optimized for light load conditions to prolong battery life. The proposed design integrates control blocks, including a dead time control circuit for non-overlapping signals, a capacitively coupled level shifter for high-voltage CMOS compatibility, and a zero current detector to minimize reverse conduction loss and enhance overall efficiency. Simulation results show that the proposed converter achieved efficiencies above 80% across a broad load current range from 12 μA to 100 mA with a peak efficiency of 92.7% at 10 mA, while the nominal quiescent current measured to be 450 nA. Master's degree 2024-04-09T06:36:32Z 2024-04-09T06:36:32Z 2024 Thesis-Master by Coursework Mo, M. (2024). A high efficiency buck converter for IoT sensors. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/174763 https://hdl.handle.net/10356/174763 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
spellingShingle Engineering
Mo, Mingwei
A high efficiency buck converter for IoT sensors
description With the surge in Internet of Things (IoT) applications, from smart homes to Industry 4.0 and healthcare, there's a critical need for power-efficient DC-DC converters to support the wide operational spectrum of IoT devices, especially those powered by Li-ion batteries. Powering a vast network of IoT devices presents challenges due to their limited battery capacity and the impracticality of frequent battery replacements. IoT sensors mostly operate in sleep mode, so the DC-DC converter's load current can drop to the microampere level. When the system is activated for data collection and processing, the load current may spike to tens of milliamperes. Thus, it's essential for the DC-DC converter to accommodate a broad spectrum of load currents, ensuring versatility and reliability in various operational states. This dissertation presents the design of a buck converter implemented in a Global Foundries (GF) 55nm CMOS process for IoT sensor applications. The converter accommodates the full 2.5V to 4.2V input voltage range of Li-ion batteries and generates a 1.2V output voltage with a load current in the range of 10 μA to 100 mA, which is optimized for light load conditions to prolong battery life. The proposed design integrates control blocks, including a dead time control circuit for non-overlapping signals, a capacitively coupled level shifter for high-voltage CMOS compatibility, and a zero current detector to minimize reverse conduction loss and enhance overall efficiency. Simulation results show that the proposed converter achieved efficiencies above 80% across a broad load current range from 12 μA to 100 mA with a peak efficiency of 92.7% at 10 mA, while the nominal quiescent current measured to be 450 nA.
author2 Siek Liter
author_facet Siek Liter
Mo, Mingwei
format Thesis-Master by Coursework
author Mo, Mingwei
author_sort Mo, Mingwei
title A high efficiency buck converter for IoT sensors
title_short A high efficiency buck converter for IoT sensors
title_full A high efficiency buck converter for IoT sensors
title_fullStr A high efficiency buck converter for IoT sensors
title_full_unstemmed A high efficiency buck converter for IoT sensors
title_sort high efficiency buck converter for iot sensors
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/174763
_version_ 1814047242505420800