Fine Tuning of an Inductive Link Through a Voltage-Controlled Capacitance

Porto, Rodrigo Wolff; Brusamarello, Valner; Pereira, L.F.A.; Sousa, Francinalva Cordeiro de

doi:10.1109/tpel.2016.2598284

Cited by 42 publications

(15 citation statements)

References 21 publications

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“…For that, a single transmitter-to-single receiver (SISO) coil system should be controlled to increase the transmission efficiency despite variable loads and misalignment. This can be realized by controlling the system frequency [ 57 ], the system gain [ 58 ], the compensation capacitors [ 59 ] and the DC-DC rectifier [ 60 ]. To overcome misalignment effects, multiple input–single output (MISO) coil systems can be realized [ 61 ], which are composed of multiple transmitter coils connected in series [ 62 , 63 ] or parallel [ 64 , 65 ].…”

Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Kanoun

Bradai

Khriji

et al. 2021

Sensors

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Nowadays, wireless sensor networks are becoming increasingly important in several sectors including industry, transportation, environment and medicine. This trend is reinforced by the spread of Internet of Things (IoT) technologies in almost all sectors. Autonomous energy supply is thereby an essential aspect as it decides the flexible positioning and easy maintenance, which are decisive for the acceptance of this technology, its wide use and sustainability. Significant improvements made in the last years have shown interesting possibilities for realizing energy-aware wireless sensor nodes (WSNs) by designing manifold and highly efficient energy converters and reducing energy consumption of hardware, software and communication protocols. Using only a few of these techniques or focusing on only one aspect is not sufficient to realize practicable and market relevant solutions. This paper therefore provides a comprehensive review on system design for battery-free and energy-aware WSN, making use of ambient energy or wireless energy transmission. It addresses energy supply strategies and gives a deep insight in energy management methods as well as possibilities for energy saving on node and network level. The aim therefore is to provide deep insight into system design and increase awareness of suitable techniques for realizing battery-free and energy-aware wireless sensor nodes.

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Section: Energy Supply For Wireless Sensor Nodesmentioning

confidence: 99%

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Kanoun

Bradai

Khriji

et al. 2021

Sensors

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“…As a result, the magnitude of I TX1 required to deliver a given amount of power is reduced, reducing overall power loss at the transmitter. Conventional impedance tuning methods [17][18][19][20][21][22][23] cannot reduce the I TX1 required to deliver a given power level. The proposed TX with L loop even achieves lower loss than a standalone single-TX.…”

Section: Improvement Of Coil-to-coil Efficiencymentioning

confidence: 99%

“…5 require high‐side isolated driving schemes because the source terminal of S A and S D reaches up to DC input voltage. Prior techniques, therefore, have relied on mechanical relay switches [17, 18], voltage‐controlled capacitors [19, 20], or triode for alternating current (TRIAC) switches [21]. These are more expensive or cannot handle high power.…”

Section: Proposed Multiple‐tx Reconfigurationmentioning

confidence: 99%

Efficient deactivation of unused LCC inverter for multiple transmitter wireless power transfer

Kim

Ahn

2019

IET Power Electronics

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The study addresses the difficulties in deactivating an unused transmitter (TX) element for a multiple-transmitter wireless power system that is driven by LCC resonant inverters. One difficulty of TX deactivation is a high-level of unwanted circulating current in unused TX coil, which increases the losses in unused TX. To suppress the unwanted current without the aid of high-voltage isolated switches and detuning capacitors, it is proposed that low-side switches in LCC bridge should be constantly turned on. The other difficulty is the runtime detuning of LCC resonant inverter in response to the activation or deactivation status of adjacent TX coil, which degrades the LCC inverter efficiency. A tuning switch and capacitor cannot directly be inserted at the LCC resonant path due to high-voltage stress and complex driving scheme. Instead, this study proposes a loop that adjusts the effective inductance of the TX coil with low-voltage stress and easy gate driving, thereby increasing the LCC inverter efficiency. The loop also provides an additional power path towards the receiver so that the coil-to-coil efficiency is also increased.

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“…In addition, they require complex filtering stages to smooth the output voltage waveform and soft-switching topologies based on zero current switching and zero voltage switching to reach an optimized functionality [11,12]. As an alternative, AC-AC power amplifier circuits are recommended due to their pure resonance behavior [13]. In addition, WPT systems often use sensing units in the transmitting side in order to detect the presence of the receiving coil and/or control their working behavior.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, WPT systems often use sensing units in the transmitting side in order to detect the presence of the receiving coil and/or control their working behavior. Various sensing units have been proposed, which can measure current [14], impedance [13], or voltage [15].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.This reduces the size of the supply circuit relative to the previous solutions. In [19], a multi-coil system with multiplexed solution is presented with a singular supply circuit. However, the selection of the appropriate coil requires dual MOSFET switches, which presents some similarity to a switch-based multi-coil system. Nevertheless, the control of the multi-coil system switches needs microcontrollers with a high number of pins. For that, in case of a big number of transmitting coils, an FPGA [22] is proposed as processing unit, leading to an increase of both energy consumption and costs.In this paper, we investigate the feasibility of a multiplexed circuit on the primary side supply approach, with the aim to reduce the circuit size and to control the system by a simple microcontroller with a limited number of pins. The main objective is to significantly decrease both energy consumption and system costs. To this end, we propose to use receiving coils having the double diameter of the transmitting coils. This is important to cover at least a singular transmitting coil for different possible positions on the top of the pad to power the device for all the possible positions. In order to enable the detection and the powering of even battery-free wireless sensor nodes, we propose that the communication between the transmitting and receiving coil is started from the transmitting side and supplied from the transferred energy on the secondary side.The paper is organized as follows: In Section 2, the primary side supply circuit for a system is presented. The description of the proposed multi-coil system control algorithm is detailed in Section 3. The experimental evaluation of the developed algorithm are reported in Section 4. Section 5 shows the analysis of the required time to start the charging process. A conclusion is provided in Section 6. Design of the Primar...

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Fine Tuning of an Inductive Link Through a Voltage-Controlled Capacitance

Cited by 42 publications

References 21 publications

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review

Efficient deactivation of unused LCC inverter for multiple transmitter wireless power transfer

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

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