Researchers at Oak Ridge National Laboratory have successfully demonstrated a 270-kilowatt wireless charging system for electric vehicles. The technology uses polyphase electromagnetic coils to achieve high power density and 95% efficiency over a five-inch air gap.
TLDR: Oak Ridge National Laboratory has set a new record by wirelessly charging a light-duty electric vehicle at 270 kilowatts. Using advanced polyphase coils and silicon carbide electronics, the system achieves 95% efficiency, potentially paving the way for high-speed, hands-free charging infrastructure in public and residential spaces.
Researchers at the Department of Energy’s Oak Ridge National Laboratory (ORNL) have demonstrated a 270-kilowatt wireless power transfer to a light-duty electric vehicle, setting a new world record for this technology class. This achievement marks a significant leap in the efficiency and speed of cable-free charging, moving the concept from a slow residential convenience to a viable high-speed industrial solution. The demonstration utilized a Porsche Taycan, modified with a lightweight polyphase electromagnetic coupling coil designed specifically by the ORNL team to handle extreme power densities.
The system operates through inductive charging, a process where energy is transferred across an air gap between a ground-based transmitter coil and a receiver coil mounted on the vehicle’s undercarriage. While wireless charging for consumer electronics is common, scaling the technology for vehicles has historically faced hurdles regarding weight, heat, and electromagnetic interference. Previous iterations of wireless charging for passenger vehicles typically operated at much lower power levels, often between 11 and 20 kilowatts, which required hours to provide a meaningful charge. By reaching 270 kilowatts, the ORNL team has brought wireless charging speeds into the realm of high-speed DC fast chargers, which can replenish a battery to 80% in under 20 minutes.
The technical breakthrough relies on a unique polyphase coil design. Unlike traditional single-phase coils that produce a stationary pulsating magnetic field, the polyphase geometry creates a rotating magnetic field. This innovation allows for much higher power density within a compact footprint, which is essential for fitting the hardware onto the chassis of a standard passenger car. The researchers achieved an efficiency rate of approximately 95% over a five-inch air gap, ensuring that the vast majority of the energy drawn from the electrical grid reaches the vehicle’s battery.
Heat management was a primary concern during the development of the 270-kilowatt system. At such high power levels, even a small percentage of energy loss can manifest as significant heat, potentially damaging vehicle components or the charging pad. To mitigate this, the ORNL team utilized silicon carbide power electronics. These wide-bandgap semiconductors are more efficient than traditional silicon-based components, allowing the system to operate at higher frequencies and temperatures while remaining relatively cool. This integration was critical for keeping the onboard charging hardware light enough to avoid impacting the vehicle’s range or handling.
Scaling wireless charging to these power levels addresses one of the primary psychological and practical barriers to electric vehicle adoption: the tethering of the car to a physical cable. High-power wireless systems could eventually be integrated into public parking spots, taxi stands, or even embedded in roadways to provide dynamic charging while vehicles are in motion. Such infrastructure would theoretically allow for smaller, lighter battery packs, as vehicles could be topped off frequently and automatically throughout the day without driver intervention.
The ORNL demonstration was supported by the U.S. Department of Energy’s Vehicle Technologies Office, reflecting a federal push to modernize the nation’s transportation infrastructure. Future research will focus on further reducing the size and weight of the secondary coil and improving the system’s tolerance to misalignment. Currently, the vehicle must be parked precisely over the pad to maximize efficiency, but engineers are working on magnetic tuning techniques to maintain high power transfer even if the car is slightly off-center. These advancements are expected to pave the way for commercial deployment in the coming decade, potentially transforming urban mobility and autonomous fleet operations.
Mark Davis serves as the Senior Correspondent for Energy, Climate, and Resource Economics at Just Right News. In an era where the conversation around the environment is often dominated by alarmism and top-down mandates, Mark provides a vital, market-oriented perspective on the complex forces shaping our world. As the lead voice behind the acclaimed feature series “Power and the Planet,” he explores the intersection of environmental policy, global energy markets, and the fundamental economic principles that sustain modern civilization.
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