Abstract
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.
Highlights
Nowadays, the development of wireless sensor nodes (WSN) [1] has progressed from the implementing wake-up technologies [2] to the realization of even battery-free WSNs with low energy consumption
wireless power transfer (WPT) systems are generally composed of two main parts: The primary side presents the charger circuit and includes typically a signal generator, a resonant compensation capacitor, and a transmitting coil [9]
In order order to the enable the detection and the powering of even battery-free wireless nodes, wethe enable detection and the powering of even battery-free wireless sensor nodes,sensor we propose that propose that the communication between the transmitting and receiving coil is started from the communication between the transmitting and receiving coil is started from the transmitting side and transmitting sidethe andtransferred supplied from theon transferred energy on the secondary side
Summary
The development of wireless sensor nodes (WSN) [1] has progressed from the implementing wake-up technologies [2] to the realization of even battery-free WSNs with low energy consumption. In [18,19], authors give a review on different large area WPT systems with their coils systems, connections and supplies circuits These systems typically present various primary side electronic architectures to power the used coil such as homogenous systems, associated single-coil. The used primary side supply circuit is simple and similar to the supply circuit of a single-coil WPT system It realizes a low power efficiency and is critical for security due to the large surface of the emitted magnetic field. To overcome these limitations, a multi-input single output wireless power transmission (MISO-WPT) system has been proposed in [23,24] consisting of several independent single WPT systems, so that after position detection only one primary side coil is activated. The experimental theanalysis analysisofofthe therequired requiredtime timetotostart startthe thecharging chargingprocess
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