Fall 2010 IAB
September 15 to 17
Power Transfer Over a Capacitive Interface
A 3.8 watt 83% efficient supply uses a capacitive interface for wireless power delivery. While the prototype is optimized for integration into a smartphone-sized device, the concept is equally applicable to rotating platforms and sensors, as well as instrumentation that requires galvanic isolation. The device requires only 60 pF interface capacitance arranged as parallel plates occupying 6 by 10 cm^2 and is scalable to mm size for applications that require only tens of mW. The capacitors are much simpler to fabricate than the coils used for inductive contactless power delivery. The possibility of high speed data transfer over the same interface is another important advantage of capacitive over inductive solutions for short range power delivery.