Novel Class B Amplifier-Based Inductive Charging System for Wireless Sensor Nodes
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2025 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2025. (Conference Record - IEEE Instrumentation and Measurement Technology Conference).
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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TY - CHAP
T1 - Novel Class B Amplifier-Based Inductive Charging System for Wireless Sensor Nodes
AU - Adawy, Abdallah
AU - Bouattour, Ghada
AU - Ibbini, Mohammed
AU - Kanoun, Olfa
N1 - Publisher Copyright: © 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - Wireless sensor nodes (WSNs) have emerged as a crucial technology for IoT applications, with power management remaining a critical challenge for long-term deployment. Currently, most wireless sensor nodes rely on batteries or energy harvesting systems, which often suffer from limited lifespan and unreliable power delivery. While inductive charging offers a promising solution, existing systems face efficiency losses and complexity issues in their power amplification stages. This paper presents a novel Class B amplifier-based inductive charging system designed specifically for wireless sensor nodes. The main objective is to develop a high-efficiency, cost-effective charging solution that maximizes power transfer while minimizing circuit complexity. The proposed system incorporates an enhanced Class B amplifier topology to leverage an adaptive operational amplifier mechanism and produce a precisely controlled trapezoidal gate drive signal for semiconductor switches. The novel circuit architecture mitigates crossover distortion, substantially improving power conversion performance. Experimental results demonstrate that the system achieves a power transfer efficiency of up to 98 % at a 2 mm charging distance. The combined standard uncertainty in efficiency was calculated as ±0.5 %, derived from statistical analysis of repeated measurements, instrumentation accuracy, and environmental factors. Additionally, the simplified circuit design size approximately 40 x 60 mm, makes the design particularly promising for low-power applications while maintaining stable operation across varying load conditions. These findings suggest that Class B amplifier-based inductive charging systems offer a viable path toward more efficient and practical wireless power solutions for WSNs.
AB - Wireless sensor nodes (WSNs) have emerged as a crucial technology for IoT applications, with power management remaining a critical challenge for long-term deployment. Currently, most wireless sensor nodes rely on batteries or energy harvesting systems, which often suffer from limited lifespan and unreliable power delivery. While inductive charging offers a promising solution, existing systems face efficiency losses and complexity issues in their power amplification stages. This paper presents a novel Class B amplifier-based inductive charging system designed specifically for wireless sensor nodes. The main objective is to develop a high-efficiency, cost-effective charging solution that maximizes power transfer while minimizing circuit complexity. The proposed system incorporates an enhanced Class B amplifier topology to leverage an adaptive operational amplifier mechanism and produce a precisely controlled trapezoidal gate drive signal for semiconductor switches. The novel circuit architecture mitigates crossover distortion, substantially improving power conversion performance. Experimental results demonstrate that the system achieves a power transfer efficiency of up to 98 % at a 2 mm charging distance. The combined standard uncertainty in efficiency was calculated as ±0.5 %, derived from statistical analysis of repeated measurements, instrumentation accuracy, and environmental factors. Additionally, the simplified circuit design size approximately 40 x 60 mm, makes the design particularly promising for low-power applications while maintaining stable operation across varying load conditions. These findings suggest that Class B amplifier-based inductive charging systems offer a viable path toward more efficient and practical wireless power solutions for WSNs.
KW - AC-AC amplifier
KW - Class B amplifier
KW - High efficiency
KW - Inductive power transfer
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=105012162656&partnerID=8YFLogxK
U2 - 10.1109/I2MTC62753.2025.11079171
DO - 10.1109/I2MTC62753.2025.11079171
M3 - Article in conference proceedings
AN - SCOPUS:105012162656
T3 - Conference Record - IEEE Instrumentation and Measurement Technology Conference
BT - IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2025 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2025
Y2 - 19 May 2025 through 22 May 2025
ER -