VHF rectification for fleet and HGV wireless charging solutions

该项目旨在开发VHF整流作为车队和HGV无线充电解决方案的关键部分。Inductive Power Projection Ltd是该项目的领导者，沃里克制造集团将提供学术支持。关于道路运输的温室气体排放，存在广泛的社会政治问题，英国的战略是鼓励广泛采用电动汽车。无电缆无线电力传输（WPT）（也称为感应电力传输）可以潜在地克服有线EV充电器的缺点，并且代表了用于改善EV操作和用户体验的潜在变革方法。除了方便之外，WPT还可以显着缩小车载电动汽车电池的尺寸，并有可能在移动中为电动汽车动态充电。虽然WPT解决方案正在被广泛探索，但由于功率密度低，充电速率很慢;虽然制造商声称WPT已准备好上市，但传输距离（可达范围）很差，发射器/接收器线圈的角度偏差经常导致电池无法完全充电。然而，最大的挑战是重型车辆。这些需要更高的收费率和更多的覆盖面比WPT目前可以提供。解决充电率问题以及到达和未对准问题的唯一方法是显著提高磁场中的功率密度。功率密度可以通过多种方式提高，但最先进的基于铜线圈的WPT系统已经高度优化。增加工作频率将满足技术挑战，但会导致不可接受的功率损耗，因此会增加运营成本。传导线圈没有出路。新兴的第二代汽车频率标准为85 kHz，高于第一代的20 kHz。在85 kHz以上存在一个“困难区域”。尽管如此，存在强烈的业务需求，以通过增加功率密度以降低成本来显著提高WPT系统的充电速率、覆盖范围和对未对准容限的鲁棒性。为此，我们使用VHF技术提供了一种全新的能力，超越了“困难区域”，并提供了大大增强的功率密度。到目前为止，还没有人能够制定高功率VHF-WPT，但整流是一个主要的障碍，需要解决之前，我们的技术可以实现商业潜力。已经在WPT中使用的功率二极管不能足够快地切换。可以足够快地切换的VHF二极管用于较小信号的环境中，其中中等效率是可以容忍的。因此，该项目将开始为VHF-WPT的高功率VHF整流器解决方案建立新的能力。

This project aims to develop VHF rectification as a key part of fleet and HGV wireless charging solutions. Inductive Power Projection Ltd is the project lead, and Warwick Manufacturing Group is to provide the academic support.There are wide-ranging socio-political issues concerning road transportation's greenhouse gas emissions, and the UK's strategy is to encourage broad adoption of EVs. Cable-free wireless power transfer (WPT) (also known as inductive power transfer) can potentially overcome the drawbacks of wired EV chargers, and represents a potentially transformational method for improving the EV operation and user experience. Aside from its convenience, WPT can significantly downsize the onboard EV battery, and has potential for dynamically charging EVs on the move. Although WPT solutions are being widely explored, charging rates are slow because the power density is low; and while manufacturers claim WPT is market ready, the transmission distance (reach) is poor, and angular misalignment of transmitter/receiver coils regularly results in batteries not receiving full charge. However, the greatest challenge is with heavy-duty vehicles. These require much higher charge-rates and more reach than WPT can currently offer. The only way to solve the charge-rate problem, as well as the reach and misalignment problems, is to significantly increase power density in the magnetic field.Power density can be increased in several ways, but the state-of-the-art copper-coil based WPT systems are already highly optimised. Increased operating frequency will meet the technical challenge but leads to unacceptable power losses and therefore more operating costs. There's no way out for conducting coils. The emerging 2nd-generation frequency standard for automotives is 85kHz, rising from 20kHz with 1st-generation. A "difficult region" exists above 85kHz. Nevertheless, there's a strong business need to significantly increase charging rates, reach and robustness to misalignment tolerance of WPT systems by increasing the power density, at reduced costs. To this end, we offer a completely new capability using VHF technology that transcends the "difficult region" and delivers greatly enhanced power densities.Until now, nobody has been able to formulate high-power VHF-WPT, but rectification is a major barrier and needs to be addressed before the commercial potential of our technology can be realised. Power diodes already used in WPT can't switch fast enough. VHF diodes that can switch fast enough are used in the context of smaller signals where moderate efficiency is tolerable. This project will therefore start to build a new capability for high-powered VHF rectifier solutions for VHF-WPT.