VHF rectification for fleet and HGV wireless charging solutions

针对车队和 HGV 无线充电解决方案的 VHF 整改

• 批准号: 76675
• 金额: $ 14.03万
• 依托单位: INDUCTIVE POWER PROJECTION LTD
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=76675
• 关键词: VHF; rectification; fleet; HGV; wireless

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.

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。 Induction Power Projection Ltd 是该项目的牵头者，Warwick Manufacturing Group 将提供学术支持。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。无电缆无线功率传输（WPT）（也称为感应功率传输）可以潜在地克服有线电动汽车充电器的缺点，并代表了一种改善电动汽车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，并具有在行驶中动态为电动汽车充电的潜力。尽管WPT解决方案正在被广泛探索，但由于功率密度低，充电速度缓慢；尽管制造商声称 WPT 已做好上市准备，但传输距离（范围）很短，并且发射器/接收器线圈的角度未对准通常会导致电池无法充满电。然而，最大的挑战是重型车辆。这些需要比 WPT 目前所能提供的更高的收费率和更大的覆盖范围。解决充电率问题以及到达和未对准问题的唯一方法是显着提高磁场中的功率密度。功率密度可以通过多种方式提高，但最先进的铜- 基于线圈的 WPT 系统已经经过高度优化。增加工作频率将应对技术挑战，但会导致不可接受的功率损耗，从而导致更高的运营成本。导电线圈没有出路。新兴的第二代汽车频率标准为 85kHz，高于第一代的 20kHz。 85kHz 以上存在“困难区域”。尽管如此，企业仍迫切需要通过提高功率密度、降低成本来显着提高 WPT 系统的充电速率、覆盖范围和对偏差容差的鲁棒性。为此，我们提供了一种使用VHF技术的全新能力，超越了“困难区域”，并大大提高了功率密度。到目前为止，还没有人能够制定高功率VHF-WPT，但整流是一个主要障碍，在实现我们技术的商业潜力之前需要解决这个问题。 WPT 中已使用的功率二极管开关速度不够快。开关速度足够快的 VHF 二极管用于较小信号且可以容忍中等效率的情况。因此，该项目将开始为 VHF-WPT 的高功率 VHF 整流器解决方案构建新功能。