Battery electric vehicles

Wireless power transmission is the process to transmit electrical energy without using wire or any physical link. WPT is mainly used at such places where it is difficult to transfer energy using conventional wires. In this research work, we investigated the need and feasibility of wireless power transmission for underwater applications. This research paper will outline research challenges, limitations and practical consideration for underwater wireless power transfer (UWPT). Recent researchers have focused on WPT in air. However, WPT is still a challenging task in underwater environment. In this study, we have presented a review on previous research works in underwater wireless power transfer (UWPT). We have provided a comparison of different techniques implemented for wireless power transfer. This paper also proposes the idea of MIMO wireless power transmission for AUVs charging. This paper elaborates capabilities and limitations of the wireless power transfer system in underwater media as stochastic nature of ocean is a big challenge in wireless power transmission. We have also addressed design challenges and seawater effects on UWPT system.

/pdf/a-review-on-research-challenges-limitations-and-practical-2toehbs2zy.pdf

A Review on Research Challenges, Limitations and Practical Solutions for Underwater Wireless Power Transfer

The wireless power transfer systems using the Class E push-pull inverter for industrial robots

A wireless power transfer system with a double-current rectifier for EVs

The continued commitment of the global community to alleviate the effects of climate change will result in widespread use of clean energy technologies including electric vehicles (EV). Safety and convenience are among the key features for successful and smooth transition to EV-based transportation. Therefore, wireless charging stations will become one of the emerging trends in the field of EV charging that has recently received considerable critical attention from researchers and practitioners to respond to the potential power and energy needs of EV fleets. Inductive wireless power transmission is widely adopted in wireless charging techniques in EV applications for its capability to efficiently transmit high power levels over long distances that can reach up to 40 cm. In this paper, a one-input one-output inductive wireless power transmission prototype is designed for EV charging and the efficiency under different charging distances is practically determined. The real voltage and current waveforms of the voltages and currents (in the transmitted and received sides) are presented to validate the robustness of the proposed prototype for battery charging under various airgap distances.

A Small-scale Inductive Wireless Power Transmission Prototype for Charging Electric Vehicles

Technology has revolutionised all aspects of human life at all consecutive intervals
and Fourth Industrial Revolution is no different. Daily transport and
energy industries not only shape the future of a country’s economy, but also
make the economy highly yielding due to recent advances. Electric vehicles
(EV) have been rapidly invading the market share during recent years. The
advancements in EV and enhanced market share demand EV charging, being
more reliant on either conventional plug-in charging or wireless charging.
Given the limitations within battery related apparatus such as escalating
battery costs, higher weight and lower power density, wireless power transfer
(WPT) is a novel state of the art technology in energising. WPT has remarkable
characteristics such as enhanced flexibility, mobility, convenience
and safety, indicating potential benefits, if it is adopted for EV with similar
efficiency; for example, it can eliminate the use of charging cables.
Despite the fact that the wireless charges for EV, have undergone significant
development phase during the last decade, many design limitations are
yet to be addressed. Although the technology has been commercially outgrown,
key limitations such as limited efficiency over distance, limited driving
range, vulnerability to misalignments, or positional offsets are yet to be
researched. Moreover, although high system efficiency can be attained, the
distance variations between the transmitter and receiver and the misalignments
will impact the system efficiency. This thesis addresses the aforementioned
limitations and design challenges of the magnetic resonance WPT system,
and proposes a novel transmitter and receiver circuit and coil designs,
to minimise the impact of distance variations and coil misplacement, reduce
the size and improve charging performance.
This thesis focusses on inductive wireless power transfer (IWPT) which
is also referred to as magnetic resonance and reviews and contrasts other
WPT mechanisms. Additionally, it presents a detailed mathematical analysis
of inductive wireless power circuit model to obtain accurate modelling parameters.
Two and four loop strongly coupled magnetic resonance (SCMR)
wireless power systems have been mathematically analysed and their performance
has been evaluated. A novel combined, conformal strongly coupled
magnetic resonance system (CSCMR) has been combined with SCMR, in order
to minimise the dimensions of the receiver and compensate the coupling
factor due to distance variations between the transmitter and receiver. In the
second phase, additional inductors were added to the existing loosely coupled
system to obtain higher efficiencies over higher distances. The size of the system has significantly reduced due to the additional smaller transmitter
and receiver inductor which were added to the existing system to achieve
better performance. The validity of each design has been discussed via a set
of simulations, and their measurements have been obtained via prototypes.
Finally, a smart WPT charging system, consisting of six transmitter loops
and a sensor network array, for an autonomous parking space was developed.
The proposed method reduces the energy required for determining a
car’s location, eventually increasing the performance of the charger.

Matjaz Rozman

Papers

Inductive wireless power transmission for automotive applications