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WiTricity

WiTricity Corporation is an American technology company specializing in through magnetic resonance, enabling efficient electricity transmission over distances without physical connections. Founded in 2007 as a from the (), it commercializes a resonant method that uses electromagnetic resonators to deliver power via magnetic fields, even through non-metallic obstacles, with applications in electric vehicles, , medical devices, and industrial equipment. The technology originated from research at MIT's Department of Physics, where Professor Marin Soljačić, along with colleagues John Joannopoulos and Peter H. Fisher, developed the concept in response to the challenge of wirelessly charging devices using existing electrical outlets. In 2007, their work culminated in a seminal experiment published in Science, demonstrating the transfer of 60 watts of power over approximately 2 meters (7 feet) using two copper coils tuned to resonate at the same frequency, achieving high efficiency in the strongly coupled regime. This non-radiative approach distinguishes WiTricity from earlier wireless methods like , as it maintains performance over mid-range distances—typically several times the size of the resonators—while prioritizing safety through low exposure that complies with international standards. Over the years, WiTricity has expanded its focus to wireless charging for electric vehicles (EVs), developing automated systems that integrate ground-based pads for seamless parking-and-charging experiences, eliminating manual plugging and supporting all-weather operation. Key features include efficiencies matching or exceeding wired chargers, rugged designs with no moving parts, and compatibility with various power levels from household outlets to high-voltage stations. By 2025, the company has shifted emphasis toward light-duty and low-speed vehicles, including golf carts and neighborhood electric vehicles, through partnerships such as with Tomberlin for wireless-enabled personal transportation and ICON EV for low-speed vehicle options, alongside pilots testing real-world integration for Ford E-Transit vans. Despite challenges like patent disputes, WiTricity continues to advance standards-compliant solutions, powering innovations like KG Mobility's 2025 Torres EVX electric pickup—the first wirelessly chargeable model of its kind.

History

Founding and Early Development

The core technology behind WiTricity originated in 2005 at the (MIT), where assistant professor of physics Marin Soljačić and his team, including Aristeidis Karalis and John D. Joannopoulos, developed the concept of resonant magnetic coupling for efficient . This approach drew inspiration from Nikola Tesla's early 20th-century experiments with wireless energy transmission but advanced it through modern principles of electromagnetic resonance, enabling non-radiative energy transfer over mid-range distances with high efficiency. The theoretical foundation was outlined in publications such as those in the Annals of Physics in 2006, emphasizing strongly coupled magnetic resonators tuned to the same frequency to overcome limitations of traditional . A pivotal demonstration occurred in 2007, when Soljačić's team at MIT successfully powered a 60-watt light bulb wirelessly over a distance of more than two meters using two self-resonant copper coils operating at 10 MHz, achieving over 40% efficiency without significant energy loss to the surroundings. This experiment, detailed in a Science journal paper titled "Wireless Power Transfer via Strongly Coupled Magnetic Resonances," validated the technology's potential for practical use and garnered widespread attention. The innovation was protected by key patents, including U.S. Patent 7,825,543 for wireless energy transfer systems, filed by Soljačić and colleagues and assigned to MIT, along with related filings covering resonator designs and coupling methods. WiTricity Corporation was established in 2007 in , as an founded by Soljačić to commercialize this patented resonant technology. Initially, the company concentrated on adapting the laboratory prototype for applications, such as wireless charging for portable devices like cell phones and laptops, aiming to eliminate the need for physical cords by enabling efficient power delivery over several centimeters to feet. Over time, this foundational work evolved to support broader applications, including charging.

Funding and Investments

WiTricity secured seed funding of $4 million in November 2007 from MIT-affiliated investors, including Venture Partners, and other early backers to support initial prototyping of its wireless power technology. The company followed with Series A through E funding rounds between 2008 and 2018, raising approximately $68 million in total during this period, with participation from prominent venture firms such as Venture Partners and Energy Ventures. In 2022, WiTricity completed a Series F round of $63 million, anchored by a $25 million investment from , which elevated the company's cumulative funding to over $146 million by mid-2025. Subsequent late-stage rounds from 2023 to 2025 added roughly $57 million, pushing overall funding past $200 million and yielding a valuation exceeding $500 million by late 2025. These investments facilitated significant scaling of research and development operations, including expanded prototyping and commercialization efforts, while prompting strategic relocations such as the 2025 shift away from its headquarters to for improved cost efficiency.

Key Milestones

In 2018, WiTricity demonstrated an 11 kW wireless charging system for electric vehicles in collaboration with , achieving up to 93% end-to-end efficiency, marking a significant advancement in high-power dynamic charging capabilities. From 2020 to 2022, WiTricity played a pivotal role in partnerships with automotive stakeholders that culminated in the adoption of the J2954 standard for wireless EV charging interoperability, with the initial standard published in October 2020 and key updates in 2022 enhancing alignment methodologies and performance specifications. In 2023, WiTricity collaborated with Bus, China's leading bus manufacturer, to deploy wireless charging for level-4 autonomous electric minibuses in , representing the industry's first commercial demonstration of in autonomous e-bus operations. In January 2024, WiTricity announced that KG Mobility's 2025 Torres EVX electric would be the first model of its kind to offer charging capability using WiTricity technology. In May 2024, launched a pilot program with International Transportation Service to test charging on Ford E-Transit vans at the . At CES 2024, WiTricity unveiled its wireless charging solutions tailored for low-speed applications, including street-legal electric golf carts from partners ICON EV and E-Z-GO, as well as neighborhood electric vehicles (), emphasizing seamless parking-and-charging integration for accessibility and convenience. In February 2025, WiTricity partnered with to introduce wireless charging for personal transportation vehicles, showcased at the PGA Show. By 2025, amid challenges in the broader passenger EV market, WiTricity announced a strategic pivot toward NEVs, industrial applications like automatic guided vehicles, and enhanced partnerships in these segments to drive growth and scalability.

Technology

Principles of Magnetic Resonance

WiTricity's wireless power transfer technology is based on resonant inductive coupling, which employs two coils—a source coil and a receiver coil—tuned to resonate at the same frequency, facilitating efficient energy transfer through oscillating magnetic fields. This method leverages the principle that resonant objects exchange energy strongly when operating at their natural frequency, allowing power to be transmitted without direct electrical contact. The core mechanism involves driving the source coil with an alternating current to generate a magnetic field that induces voltage in the nearby receiver coil via mutual inductance, with resonance enhancing the coupling efficiency. The mathematical foundation of this resonance lies in the condition where the \omega of the driving signal matches the natural of each , given by \omega = \frac{1}{\sqrt{LC}}, with L as the and C as the in the LC-tuned . This tuning enables a high quality factor Q > 100, defined as Q = \frac{\omega L}{R} where R is the , which minimizes losses by allowing the to build up and sustain oscillations with low dissipation. High Q values ensure that even weak between the coils results in efficient transfer, as the for efficiency incorporates the coupling coefficient \kappa and loss rates, yielding end-to-end efficiencies approaching theoretical maxima. Unlike non-resonant , which relies on tight physical alignment and close proximity (typically <5 cm) for acceptable efficiency due to rapidly decaying , resonant permits mid-range transfer over 10-50 cm with efficiencies exceeding 90%, even under misalignment of several centimeters. This capability arises from the strong regime where the compensates for distance-induced coupling reduction, maintaining high power transfer without requiring precise positioning. The technology builds on a seminal 2007 breakthrough by researchers at , who demonstrated 60 W of power transfer over 2 m at 40% efficiency using self-resonant coils in the strongly coupled regime. Subsequent advancements have scaled this to practical systems delivering up to 11 kW with efficiencies over 94%, enabling robust wireless charging solutions. Safety is inherent in the design, as the magnetic fields are confined to the near-field region through evanescent waves that decay rapidly beyond the coils, ensuring (EMF) exposure remains well below International Commission on Non-Ionizing Radiation Protection (ICNIRP) limits for the general public, such as 27 µT at 85 kHz. This non-radiative approach avoids far-field , minimizing and biological risks.

System Components and Operation

The WiTricity wireless charging system consists of two primary hardware elements: the Ground Assembly (GA) transmitter and the Vehicle Assembly () receiver. The GA, which can be buried, surface-mounted, or flush-installed, includes a charging pad housing a primary coil, ferrite plates for guidance, aluminum shielding to contain electromagnetic fields, and a resonant matching network with tuning capacitors to optimize energy transfer. Connected to this pad is a wall box or unit containing , including an inverter that converts standard grid input to high-frequency current. The VA, mounted on the underside of the vehicle or device, features a secondary coil similarly equipped with ferrite and shielding, along with a circuit that converts the induced current back to for battery charging, and a tunable matching network for . In operation, the process begins with from entering the GA's inverter, which generates a high-frequency oscillating current—typically at 85 kHz, as standardized by J2954 for light-duty . This current drives the primary in the GA pad, creating an oscillating through resonant . When a parks over the pad, the VA's secondary , tuned to the same resonant frequency, captures the across an air gap of 10-25 cm, inducing an current in the secondary . The then converts this to DC, delivering power directly to the 's , with transfer rates scalable from 3.6 kW to 22 kW and end-to-end efficiencies reaching up to 94%. Charging initiates automatically upon sufficient alignment, supported by foreign and live sensors for safety. The system's design emphasizes tolerance to parking misalignment, relying on the broad rather than precise docking, with lateral (side-to-side) tolerances of ±10 cm and longitudinal (front-to-back) tolerances of ±7.5 cm while maintaining high efficiency. For enhanced user guidance, low-intensity magnetic fields from auxiliary coils in the can assist in positioning, as outlined in J2954 alignment methodologies. Vertical tolerance corresponds to the air gap range of 10-25 cm, accommodating various ground clearances from sports cars to SUVs. WiTricity systems integrate seamlessly with conventional charging infrastructures, supporting hybrid wired-wireless setups where vehicles equipped with () or plugs can fallback to corded charging if needed, while adhering to SAE J2954 for .

Applications

Electric Vehicles

WiTricity's wireless charging systems for electric vehicles () primarily focus on static and dynamic power transfer, enabling convenient charging without physical connectors while addressing key limitations in battery range and infrastructure. These adaptations build on magnetic resonance technology to transfer power efficiently over air gaps of up to 250 mm, suitable for automotive integration. Static charging solutions from WiTricity involve park-and-charge pads installed in garages, parking lots, or driveways, delivering power levels from 7.7 kW to 22 kW for passenger cars. These systems support Level 2 charging rates comparable to plugged-in counterparts, with end-to-end efficiencies exceeding 90%. Demonstrations included integration into prototypes in , where the BMW 530e iPerformance used WiTricity's receiver unit for automated wireless charging at 3.6 kW. Dynamic charging extends this capability to in-motion power transfer using road-embedded coils, allowing EVs to recharge while driving over equipped segments, which mitigates and enables smaller battery packs. WiTricity tested this for buses in a 2023 collaboration with Bus in , where autonomous e-buses received power wirelessly during operation, marking an industry first for commercial autonomous vehicles. Such dynamic systems are particularly beneficial for fleet applications like public transit. Market adoption of WiTricity's solutions has advanced through compliance with international standards, including J2954 for light-duty vehicles and ISO 19363 for heavy-duty applications, ensuring , , and safety across manufacturers. By 2025, pilots deploying these systems have operated in and , demonstrating reliability in diverse environments. The global wireless charging market, driven by such technologies, is projected to reach USD 1.12 billion by 2032, growing at a CAGR of 43.8% from 2025 to 2032. To address deployment challenges, WiTricity's chargers incorporate IP67-rated weatherproofing for protection against dust and water immersion, ensuring operation in adverse conditions like or . Integrated foreign (FOD) uses sensors to identify metal or living objects, automatically halting power transfer to prevent hazards and maintain efficiencies above 90%, even with minor misalignments. In 2025, WiTricity emphasized applications for neighborhood electric vehicles (), such as golf carts, with compact 3-7 kW systems designed for residential and community settings like gated communities or campuses. These lower-power units facilitate automated charging at docking stations, enhancing usability for low-speed fleets while aligning with standards for light-duty wireless transfer. In 2025, WiTricity enabled wireless charging for KG Mobility's Torres EVX electric , marking the first production model of its kind.

Industrial and Consumer Uses

WiTricity's magnetic resonance technology has been applied to settings, particularly for powering automated guided vehicles (AGVs) and mobile robots in factory automation and intralogistics. These systems enable seamless, automatic charging without manual intervention, allowing vehicles to recharge while operating within designated zones, thereby minimizing operational interruptions. For instance, in , WiTricity entered a global licensing agreement with Wiferion to integrate its charging intellectual property into applications, including AGVs for and . Similar implementations through licensees like Daihen and support high-power transfer for unmanned vehicles, facilitating continuous operation in environments such as manufacturing plants and distribution centers. In these industrial contexts, systems achieve efficiencies of 90-94%, comparable to wired alternatives while eliminating the need for plugs, connectors, or swaps that can lead to hazards and equipment wear. This results in reduced , as AGVs and robots can perform more tasks per shift without pausing for manual recharging, enhancing overall in automated facilities. By November 2025, WiTricity expanded its offerings to in sectors like operations, partnering to deploy 900 W wireless systems that further underscore the technology's for autonomous workflows beyond traditional . For , WiTricity developed early prototypes in the demonstrating wireless charging for devices like laptops and smartphones at power levels of 6-12 . These systems used magnetic to transfer power over short distances of up to 12 inches with approximately 95% efficiency, addressing limitations of inductive methods by tolerating greater misalignment between transmitter and receiver. Demonstrations at events like CES in 2016 showcased modified laptops charging on pads without precise alignment, highlighting potential for cord-free integration in home and office settings. Although WiTricity's focus has shifted toward higher-power applications, its resonance-based approach continues to influence consumer charging designs emphasizing flexibility over strict positioning requirements. In medical applications, WiTricity's technology supports low-power wireless transfer for implantable devices, such as cardioverter defibrillators and resynchronization therapy units, operating below 1 W to avoid with sensitive . The non-radiative magnetic near-field ensures safe delivery without line-of-sight requirements or radiofrequency emissions, making it suitable for deep-tissue implants. Early explorations in the targeted devices like left ventricular assist systems, where efficient, compact power transfer reduces the need for invasive replacements.

Products and Partnerships

Product Portfolio

WiTricity's primary commercial offering is the Halo™ Wireless Charging System, a modular platform designed for electric vehicles that delivers power levels ranging from 3.7 kW to 11 kW with end-to-end efficiencies of 90-93%. The system comprises a pad and receiver kit, enabling automatic charging upon parking alignment, and is certified for both residential and commercial installations under standards such as J2954 and ISO 15118. Priced at $3,500–$4,000 per unit for GA/VA kits (as of 2025), it supports Level 2 charging speeds equivalent to 35-40 miles of range per hour. For industrial applications, WiTricity provides wireless charging solutions, a scalable 1-50 kW system tailored for automated guided vehicles (AGVs) and , incorporating adaptive to optimize efficiency across varying loads and distances. This system operates in harsh environments and integrates with software for and scheduling. As of 2025, WiTricity expanded its portfolio with (NEV) kits optimized for , delivering high-efficiency wireless charging to support quick residential recharges, and opportunity charging systems for buses to enable charging during routes. These additions feature enhanced ratings for outdoor durability. In 2025, WiTricity partnered with to enable wireless charging for the Torres EVX electric pickup—the first wirelessly chargeable model of its kind—and with ICON EV and for NEV and applications. WiTricity's products support customization across scalable frequencies from 6.78 MHz to 85 kHz and adjustable power outputs, with integrated software enabling fleet-wide management, diagnostics, and over-the-air updates for optimized performance.

Licensing and Collaborations

WiTricity holds a comprehensive global portfolio exceeding 1,500 issued and applications centered on resonant technologies for . This forms the foundation of the company's licensing strategy, enabling widespread adoption across industries while protecting innovations in efficient, long-range wireless charging systems. Among key licensees, has held rights to WiTricity's wireless charging patents since 2014, applying them to and automotive plug-in vehicle systems offered to original equipment manufacturers. In 2022, Wiferion secured a for applications, integrating WiTricity's technology into mobile wireless power solutions for and . By 2025, the portfolio has been licensed to over 20 organizations, including , , MAHLE, , , and Anjie Wireless, fostering deployments in electric vehicles, settings, and devices. WiTricity's collaborations emphasize joint research, development, and commercialization. In 2022, invested $25 million and acquired a minority stake to co-advance charging for electric vehicles, including efforts toward industry standards. The company partnered with Bus in 2023 for pilot deployments of charging on autonomous electric buses in , marking a commercial milestone in public transit. became the first automaker to offer WiTricity-enabled charging through a pilot program for its 530e model, while licensed the technology for integration and testing in hybrid and electric vehicles. Through active participation, WiTricity leads contributions to global standards, including SAE J2954 for light-duty wireless power transfer in electric vehicles and IEC 61980 for interfaces between utilities and charging systems. These efforts ensure interoperability and safety, with WiTricity's resonant coupling principles integral to alignments like China's national EV wireless charging standard. By 2025, licensing and royalties from these partnerships and standards involvement have expanded into new energy vehicle markets in Asia, supporting scalable revenue through technology dissemination.

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