Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In thi...

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Bibliographic Details
Published in:Energies (Basel) 2020-03, Vol.13 (5), p.1244
Main Authors: Bouattour, Ghada, Elhawy, Mohamed, Naifar, Slim, Viehweger, Christian, Ben Jmaa Derbel, Houda, Kanoun, Olfa
Format: Article
Language:English
Subjects:
Circuits
Communication
contactless charging
contactless power transmission
Control algorithms
Costs
Efficiency
Electronic circuits
Energy consumption
energy harvesting
inductive power transmission
Magnetic fields
miso system
multi-coil system
multiplexer
Multiplexing
passive peak detector
Receiving
resonant power transmission
Sensors
Signal generators
wireless power transmission
wireless sensor node
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Summary:Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this paper, a compact multiplexed primary side electronic circuit is proposed, which includes only one signal generator, a passive peak detector, a communication module, and a compensation capacitor. The novel approach has been studied and evaluated for a MISO-WPT system having a 16 coils on primary side and one coil on secondary side having the double diameter. Results show that a standard microcontroller, in this case an STM32, is sufficient for the control of the whole system, so that the costs and the energy consumption are significantly reduced. An activation strategy has been proposed, which allows to determine the optimal transmitting coil for each position of the receiving coil and to switch it on. The time-to-start-charging at different positions of the receiving coil and different number of neighbors has been determined. It remains in all cases under 2.5 s.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13051244