VHF Wireless Power Transfer

关于道路交通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（EV）。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，并且代表用于改善EV操作和用户体验的潜在变革方法，特别是对于机会充电，例如对于装载区中的货车。除了方便之外，WPT还可以显著缩小车载电动汽车电池的尺寸，并具有在移动中为电动汽车动态充电的潜力。电力传输效率高度依赖于车辆上的发射器线圈（通常埋在地下）和接收器线圈的精确对准。重型电动汽车还需要比WPT目前提供的充电率高得多的充电率。提高WPT系统的工作频率可以提高功率密度，解决这两个问题，并使WPT更具吸引力。最先进的系统工作在85 kHz，原因包括使用铁氧体磁芯，集肤效应和可用的电力电子设备。Inductive Power Projection Ltd最近发明并保护了一种新的方法来创建VHF磁场，用于不同的应用。我们没有频率限制，因此在VHF频段（松散地定义为30 MHz-300 MHz）工作。在咨询了先进推进中心之后，我们意识到了VHF-WPT对电动汽车充电的潜在价值，并且在与沃里克材料集团进行技术同行评审之后，很明显，通过使用VHF，我们避免了85 kHz以上的“困难频率区域”。根据我们目前的理解，我们的VHF-WPT充电方法可以投射超过400 kW/模块，以非常高的效率轻松地达到800 mm（无线部分> 99%）;这与当前技术水平的WPT系统相比，在WPT系统中，50 kW/模块被认为是优秀的，并且达到的雄心勃勃的目标是300 mm。已经确定了500 mm横向未对准的坚韧目标，即使没有大的车辆侧接收器线圈，我们也可以超过这个值。然而，VHF-WPT的可行性还需要研究和测试，以便更好地了解其局限性，而本项目正是利用我们现有的设备和我们之前工作中开发的技术来实现这一点。我们的解决方案有着巨大的市场机会，但我们的两个研究机构合作伙伴将致力于解决两个已确定的技术差距。

There are wide sociopolitical issues concerning road transportation's greenhouse gas emissions, and the UK's strategy is to encourage wide adoption of electric vehicles (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, especially with opportunity charging, for example for a van in a loading bay. Aside from its convenience, WPT can enable significant downsizing of the onboard EV battery, and has the potential for dynamically charging EVs on the move.Significant snags for WPT exist. The power transfer efficiency is highly reliant on precise alignment of the transmitter coils (usually buried in the ground) and the receiver coils on the vehicle. Heavy-duty EVs also require much higher charge rates than WPT can currently offer.Increasing the operating frequency of WPT systems increases the power density, solving both these issues and making WPT far more attractive all-round. State-of-the-art systems work at 85 kHz for a host of reasons including the use of ferrite cores, the skin effect, and available power electronics.Inductive Power Projection Ltd have recently invented and protected a new way to create VHF magnetic fields for different applications. We're not frequency-limited and so operate in the VHF band (loosely defined as 30MHz-300MHz). After consulting with the Advanced Propulsion Centre, we realised the potential value for VHF-WPT for charging EVs, and following a technical peer review with Warwick Materials Group, it became clear that by using VHF we avoid a "difficult frequency region" above 85kHz.With our present understanding, our VHF-WPT charging method can project in excess of 400 kW per module, easily to 800 mm at very high efficiencies (\> 99% for the wireless part); this compares with current state-of-the-art WPT systems where 50 kW/module is considered excellent, and an ambitious target for reach is 300 mm. A tough target of 500 mm lateral misalignment has been identified, which we can exceed even without a large vehicle-side receiver coil. However, the feasibility of VHF-WPT needs to be studied and tested in order to better understand the limitations, and this project does that, using the equipment we already own, and techniques developed during our previous work.There's a significant market opportunity for our solution, but two identified technology gaps will be worked on by our two research organisation partners.