Design and implementation of an 85-kHz Bidirectional Wireless Charger

Bidirectional wireless chargers will facilitate the seamless adoption of the V2G technology. When compared with unidirectional systems, developing a bidirectional wireless charger for an EV poses some new challenges. This paper presents some of the technological challenges (mainly related to the power converters) that we have addressed when building a bidirectional wireless charger. In particular, we have built a 3.7 kW bidirectional prototype working at 85 kHz. Experimental results for both power flows demonstrate the validity of the design.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Signal and System Design for Wireless Power Transfer : Prototype, Experiment and Validation

A new line of research on communications and signals design for Wireless Power Transfer (WPT) has recently emerged in the communication literature. Promising signal strategies to maximize the power transfer efficiency of WPT rely on (energy) beamforming, waveform, modulation and transmit diversity, and a combination thereof. To a great extent, the study of those strategies has so far been limited to theoretical performance analysis. In this paper, we study the real over-the-air performance of all the aforementioned signal strategies for WPT. To that end, we have designed, prototyped and experimented an innovative radiative WPT architecture based on Software-Defined Radio (SDR) that can operate in open-loop and closed-loop (with channel acquisition at the transmitter) modes. The prototype consists of three important blocks, namely the channel estimator, the signal generator, and the energy harvester. The experiments have been conducted in a variety of deployments, including frequency flat and frequency selective channels, under static and mobility conditions. Experiments highlight that a channeladaptive WPT architecture based on joint beamforming and waveform design offers significant performance improvements in harvested DC power over conventional single-antenna/multiantenna continuous wave systems. The experimental results fully validate the observations predicted from the theoretical signal designs and confirm the crucial and beneficial role played by the energy harvester nonlinearity.Comment: Accepted to IEEE Transactions on Wireless Communication

Wireless Power Transfer For Space Applications: System Design And Electromagnetic Compatibility Compliance Of Radiated Emissions

This dissertation evaluates the possibility of wireless power transfer (WPT) systems for space applications, with an emphasis in launch vehicles (rockets). After performing literature review for WPT systems, it was identified that magnetic resonance provides the more suited set of characteristics for this application. Advanced analysis, simulation and testing were performed to magnetic resonance WPT systems to acquire system performance insight. This was accomplished by evaluating/varying coupling configuration, load effects and magnetic element physical characteristics (i.e. wire material, loop radius, etc.). It was identified by analysis, circuit simulation and testing that the best coupling configuration for this application was series-series and series-shunt with Litz wire loop inductors. The main concern identified for the implementation of these systems for space applications was radiated emissions that could potentially generate electromagnetic interference (EMI). To address this EMI concern, we developed the Electromagnetic Compatibility Radiated Emissions Compliance Design Evaluation Approach for WPT Space Systems. This approach systematically allocates key analyses, simulations and tests procedures to predict WPT EMC compliance to NASA’s EMC standard Mil-Std-461E/F. Three prototype/magnetic elements were successfully assessed by implementing the WPT EMC design approach. The electric fields intensity generated by the WPT prototypes/magnetic elements tested were: 30.02 dBµV/m, 28.90 dBµV/m and 82.13 dBµV/m (requirement limit: 140 dBµV/m). All three prototypes successfully transferred power wirelessly and successfully met the NASA EMC requirements

Wireless Power Transfer with Class E Power Amplifier and Magnetic Field Repeater

Wireless Power Transfer is the future alternative to replace overhead and underground transmission methods in delivering electrical power. The attention given to this technology has been increasing tremendously after MIT introduced Magnetic Resonance Coupling which utilizes magnetic resonance to deliver power wirelessly. There is great potential to research on this area as it can deliver power to unreachable areas and it will be the method of transmitting electrical power in the future. In this project, a combination of Class E power amplifier and magnetic field repeater is proposed with the aim of enhancing the transmission power and distance. Besides that, Litz wire is used as the material for transmitter and receiver coil in order to reduce the skin effect because the ac resistance will increase drastically when the system is operating in high frequency

Wireless Power Transmission With Brook's Coil Adaptation and Class E Power Amplifier

Wireless Power Transmission (WPT) via Magnetic Resonance Coupling will be the future method in transmitting electrical power. The vision of transferring power wirelessly will provide a solution to power equipments in unreachable areas. Success of WPT depends on distance of power transmission which requires great improvement. This project propose a multilayer Brook's coil design and class E power amplifier to increase transmission distance. The use of zero voltage switching MOSFET operation in a 375kHz class E power amplifier, serves to reduce power loss and increase current supplied to transmitter coil. A DC voltage of 13.34V was obtained at 30cm with 3.068mW power output at receiver end. This resulted to 15 times increased in transmission distance from previous project. Maximum output power achievable for this project was 418mW at 10cm transmission distance

Wireless power and data transfer via a common inductive link using frequency division multiplexing

For wireless power transfer (WPT) systems, communication between the primary side and the pickup side is a challenge because of the large air gap and magnetic interferences. A novel method, which integrates bidirectional data communication into a high-power WPT system, is proposed in this paper. The power and data transfer share the same inductive link between coreless coils. Power/data frequency division multiplexing technique is applied, and the power and data are transmitted by employing different frequency carriers and controlled independently. The circuit model of the multiband system is provided to analyze the transmission gain of the communication channel, as well as the power delivery performance. The crosstalk interference between two carriers is discussed. In addition, the signal-to-noise ratios of the channels are also estimated, which gives a guideline for the design of mod/demod circuits. Finally, a 500-W WPT prototype has been built to demonstrate the effectiveness of the proposed WPT system

Proposal on Model Based Current Overshoot Suppression of Receiver Side Coil in Drone Wireless Power Transfer System

This paper proposes a model-based control method in the wireless power transfer (WPT) system by operating a semi-bridgeless active rectifier (SBAR) to suppress the secondary coil current overshoot. By damping the current overshoot, it is possible to reduce the rectifier's rated current and decrease the rectifier's size, which is beneficial for the lightweight-oriented system such as drones. In the control method, an inverse of the plant model is used to calculate the reference input to the system. The current overshoot is reduced by operating the SBAR under the duty ratio calculated from the model. To confirm the performance of the proposed method, the simulation and the experiment using the WPT prototype are conducted. The experimental results show that the proposed method can suppress the secondary coil current overshoot. The results suggest it is possible to realize the lighter secondary system by applying the proposed method.Comment: This paper was presented at IEEE 2022 Wireless Power Week (WPW

Wireless Power System Design for Maximum Efficiency

With the potential of cutting the last cord, wireless power transfer (WPT) using magnetic resonant coupling is gaining increasing popularity. Evolved from the inductive WPT techniques used in commercial products today, resonant WPT can transfer power over a longer distance with higher spatial freedom. Experimental prototypes have shown power transfer across a 2 m air gap [1], proving the viability of resonant WPT. Industrial consortia such as the AirFuel Alliance have standard specifications that enable wide application in consumer electronics.Despite the promises of high efficiency and long transfer distance, resonant WPT has significant challenges to overcome before the broad adoption will occur. One of the critical challenges is the how to design the complicated system. A WPT system consists of multiple parts: the transmitter coil and the compensation capacitor, the receiver coil and the compensation capacitor, and the power stages which consists of the inverter in the transmitter side and rectifier in the receiver side. This thesis investigates the WPT system design for maximum efficiency. It explores modeling and design of individual stages as well as the entire system design method. From the careful literature review, it is found that current design method of coils is insufficient for consumer electronics applications due to the strict sensitivity of size. The current power stage design method is insufficient or inaccurate for WPT applications where wide loading situations need to be considered. The system-level design method is based on assumptions that are not generally true due to the neglect of ZVS requirement and diode rectifier reactance. Instead, previously established techniques in coil design are applied to invent a new coil structure for reduced ESR while achieving a compact size. Previous ZVS inverter and diode rectifier topology are combined with waveform and circuit analysis to develop new accurate modeling and design method for a wide load range. From the resulting coil and converter models, an entire WPT system model and design methodology are proposed which highlights the design parameters selection and the design sequence. These techniques together contribute to a WPT system in terms of both high efficiency and compact size

An Event-Based Synchronization Framework for Controller Hardware-in-the-loop Simulation of Electric Railway Power Electronics Systems

The Controller Hardware_in_the_loop (CHIL) simulation is gaining popularity as a cost_effective, efficient, and reliable tool in the design and development process of fast_growing electrified transportation power converters. However, it is challenging to implement the conventional CHIL simulations on the railway power converters with complex topologies and high switching frequencies due to strict real_time constraints. Therefore, this paper proposes an event-based synchronization CHIL (ES_CHIL) framework for high_fidelity simulation of these electrified railway power converters. Different from conventional CHIL simulations synchronized through the time axis, the ES_CHIL framework is synchronized through the event axis. Therefore, it can ease the real_time constraint and broaden the upper bound on the system size and switching frequency. Besides, models and algorithms with higher accuracy, such as the diode model with natural commutation processes, can be used in the ES-CHIL framework. The proposed framework is validated for a 350 kW wireless power transformer system containing 24 fully controlled devices and 36 diodes by comparing it with Simulink and physical experiments. This research improves the fidelity and application range of the power converters CHIL simulation. Thus, it helps to accelerate the prototype design and performance evaluation process for electrified railways and other applications with such complex converters