Inductive power transfer for autonomous sensors in presence of metallic structures

Albesa, Joan; Gasulla, Manel

doi:10.1109/i2mtc.2012.6229658

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…On the other hand, the input and output power of the switching buck regulator are related by (25) where  is the efficiency of the regulator. Assuming a constant value of , the switching regulator acts as a constant power load.…”

Section: Switching Buck Regulatormentioning

confidence: 99%

“…6 shows the circuit schematic of the implemented primary network. This circuit was previously presented in [18] and [25]. It is mainly composed of a class D power amplifier based on a low-cost commercial self-oscillating half-bridge driver (IR2153) and two external N-channel MOSFETs (BSH103, Philips Semiconductor), M a and M b .…”

Section: Circuit Implementationmentioning

confidence: 99%

“…On the other hand, the use of small-size coils is a requirement in the selected application. As a result, and considering a low frequency of operation (< 150 kHz), magnetic-core coils are good candidates to fulfill all the requirements as they provide both high coupling and quality factors, as well as high coil values [13], [25]. Magnetic-core coils from Fastron (PIST model) were selected.…”

Section: Circuit Implementationmentioning

confidence: 99%

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Occupancy and Belt Detection in Removable Vehicle Seats Via Inductive Power Transmission

Albesa

Gasulla

2015

IEEE Trans. Veh. Technol.

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Abstract-This work proposes the use of inductive links in order to wirelessly power an autonomous sensor in a vehicle application. The selected application is intended for occupancy and belt detection in removable vehicle seats, where wiring the seat detectors from the vehicle chassis is unpractical. The autonomous sensor includes the seat detectors and a wireless transceiver to transfer the data about the state of the detectors. In order to compensate the loose coupling between the coupled coils, resonant tanks were used. To drive the transmitting resonant network, a commercial class D amplifier was used. Working frequency was restricted to 150 kHz. Commercial magnetic-core coils were selected as they provide high coil values and quality factors in a small-size factor, which is a requirement for the intended application. At the receiving network, a rectifier and a voltage regulator were used to provide a DC voltage supply to the autonomous sensor. Three kinds of voltage regulators were compared from the point of view of the power efficiency. Both a theoretical analysis and experimental results are presented for different combinations of coils and working frequencies. Theoretical analysis shows that the operating points for the linear shunt regulator always lead to higher power efficiencies compared to other alternatives such as linear series and switching buck regulators. Experimental tests were carried out using a mechanical setup to fix the coil-to-coil distances. Experimental results agree with the theoretical analysis. Achieved power efficiencies ranged from around 50% to 10% for coil-to-coil distances from one to three times the inner diameter of the coils. Experimental tests also showed that the autonomous sensor was properly powered up to coil-to-coil distances of 2.5 cm, i.e. more than four times the inner diameter of the coils.

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Section: Switching Buck Regulatormentioning

confidence: 99%

Section: Circuit Implementationmentioning

confidence: 99%

Section: Circuit Implementationmentioning

confidence: 99%

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Occupancy and Belt Detection in Removable Vehicle Seats Via Inductive Power Transmission

Albesa

Gasulla

2015

IEEE Trans. Veh. Technol.

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“…There, L1, L2, L3, and L4 are the self-inductance of the driving, transmission, receiving, and pick-up coils, respectively, C1, C2, C3, and C4 the respective resonance capacitance of the coils, R1, R2, R3, and R4 the equivalent resistances of the coils, Rp the internal resistance of the power supply (50 Ω), RL the load resistance (50 Ω), and V1 the excitation voltage source. The metals can be treated as an equivalent resistor RA, connected with a serial equivalent inductor LA [11][12][13]. Mmn are the mutual inductance of any pair of coils and metals, with m, n ϵ {1, 2, 3, 4, A}.…”

Section: Circuit Modelmentioning

confidence: 99%

Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System

Huang

2016

Energies

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Abstract:To meet the regulations established to limit human exposure to time-varying electromagnetic fields (EMFs) such as the International Committee on Non-Ionizing Radiation Protection (ICNIRP) guidelines, thin metallic sheets are often used to shield magnetic field leakage in high power applications of wireless power transfer (WPT) systems based on magnetic field coupling. However, the metals in the vicinity of the WPT coils cause the decrease of self and mutual inductances and increase of effective series resistance; as such, the electric performance including transmission power and the efficiency of the system is affected. With the research objective of further investigating excellent shielding effectiveness associated with system performance, the utilization of the optimal magnetic field shielding method by metallic sheets in magnetic field coupling WPT is carried out in this paper. The circuit and 3D Finite Element Analysis (FEA) models are combined to predict the magnetic field distribution and electrical performance. Simulation and experiment results show that the method is very effective by obtaining the largest possible coupling coefficient of the WPT coils within the allowable range and then reducing the value nearest to and no smaller than the critical coupling coefficient via geometric unbroken metallic sheets. The optimal magnetic field shielding method which considers the system efficiency, transmission power, transmission distance, and system size is also achieved using the analytic hierarchy process (AHP). The results can benefit WPT by helping to achieve efficient energy transfer and safe use in metal shielded equipment.

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Comparative study of metal obstacle variations in disturbing wireless power transmission system

Zhang

Yang

Zhang

et al. 2016

2016 IEEE Conference on Electromagnetic Field Computation (CEFC)

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Inductive power transfer for autonomous sensors in presence of metallic structures

Cited by 5 publications

References 12 publications

Occupancy and Belt Detection in Removable Vehicle Seats Via Inductive Power Transmission

Occupancy and Belt Detection in Removable Vehicle Seats Via Inductive Power Transmission

Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System

Comparative study of metal obstacle variations in disturbing wireless power transmission system

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