Inductive Charging
Introduction
Vehicle inductive charging, or wireless charging, uses electromagnetic fields to transfer power to an electric car's battery without cables. This contactless method allows for convenient "snack charging" even during brief stops.
Charging without cable: working
Automakers and energy firms are advancing inductive charging—wireless, fast, and cable-free. A ground coil sends power to a coil under the car via electromagnetic fields. Already in use, 200 kW charges electric buses in Braunschweig while drivers take a break.
Fast, Frequent Wireless Charging
Dynamic inductive charging is being tested in Jinan, China, and on Qualcomm’s Paris track, enabling EVs to charge wirelessly while driving. This supports smaller, cheaper, and greener batteries. Qualcomm is licensing its pad design for broader use.
Challenges
| Drawbacks | Advantages |
|---|---|
| Wireless charging is less efficient (80–90%) and slower (3–11 kW). | Convenient, cable-free charging. |
| Requires precise alignment. | Ideal for fleets and mobility-impaired users. |
| Installation is costly and disruptive. | Requires less maintenance. |
| Pads and networks are expensive and limited. | Supports autonomous vehicles. |
| Standards are evolving; deployment is slow. | Keeps urban spaces clutter-free. |
Market outlook
- Electreon: Road coils for charging EVs on the move; active in Europe and US.
- Wi-Tricity: MIT spinout; 90% efficient wireless systems; partners with top automakers.
- HEVO: Wireless home and fleet chargers; backed by Tesla VC.
- Evatran: Early wireless charger maker; aftermarket pads for Tesla and others.
Tel Aviv University
Tel Aviv University’s fleet uses combined dynamic and stationary inductive charging, cutting bus battery size by 90% (400 kWh to 42 kWh) and slashing charging time, validated by Electreon.
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