Abstract
The earliest and simplest impedance compensation technique used in inductive wireless power transfer (WPT) design is the series-series (SS) compensation circuit, which uses capacitors in series with both primary and secondary coils of an air-gapped transformer. Despite of its simplicity at the resonant condition, this configuration exhibits a major sensitivity to variations of the load attached to the secondary, especially when higher coupling coefficients are used in the design. In the extreme situation that the secondary coil is left at open circuit, the current at the primary coil may increase above the safety limits for either the power converter driving the primary coil or the components in the primary circuit, including the coil itself. An approach often used to minimize this problem is detuning, but this also reduces the electrical efficiency of the power transfer. In low power, fixed-distance stationary WPT, a fair trade-off between efficiency and safety must be verified. This paper aims to consolidate a simple design procedure for such a SS-compensation, exemplifying its use in the prototype of a WPT system for automotive light detection and ranging (LiDAR) equipment. The guidelines herein provided should equally apply to other low power applications.
Highlights
The possibility of energizing different apparatuses by inductive wireless power transfer (WPT) is very appealing, and the technology becomes more popular as it is continually improved to achieve higher electrical efficiency and power levels, with the use of modern components and simple circuitry design techniques, what results in low cost of implementation
The SS-compensated architecture is widely used in inductive wireless power transfer (WPT)
A design procedure was presented, reconstructed from previously developed theory, which is valid when the application favors the use of a fixed frequency, such as in the case of fixed magnetic coupling between primary and secondary coils
Summary
The possibility of energizing different apparatuses by inductive wireless power transfer (WPT) is very appealing, and the technology becomes more popular as it is continually improved to achieve higher electrical efficiency and power levels, with the use of modern components and simple circuitry design techniques, what results in low cost of implementation. Hertz first came across WPT, realizing that it was possible to produce a spark in between the terminals of a Riess coil, when switching electric current in another of these coils, positioned close to the first one, in a parallel plane [3]. This short range phenomenon, that can be purely credited to magnetic induction, constituted a wireless extension of the “cored” induction, discovered by Faraday in 1831, in his ring transformer experiment [4,5], which, among other observations, had provided Maxwell the experimental evidence for his treatise itself
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
