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April 21, 2011

Mtg: Capacitive Power Transfer for Contactless Charging

by @ 8:01 am. Filed under ALL, Communications, Electronics Design
 

? WEDNESDAY May 18, 2011
SCV Power Electronics Chapter
Speaker: Mitchell Kline, UC Berkeley EECS graduate student
Time: Networking & Pizza at 6:00 PM; Presentation at 6:30 PM
Cost: Donations for food accepted
Place: National Semiconductor Building E Auditorium, 2900 Semiconductor Drive, Santa Clara
RSVP: from website
Web: www.ewh.ieee.org/r6/scv/pels

The simplicity and low cost of capacitive interfaces makes them very attractive for wireless charging stations.? Major benefits include low electromagnetic radiation and the amenability of combined power and data transfer over the same interface.? We present a capacitive power transfer circuit using series resonance that enables efficient high frequency, moderate voltage operation through soft-switching.? We discuss limitations on the maximum efficiency for a given amount of coupling capacitance and present an optimal design which achieves this efficiency.? Automatic tuning loops ensure the circuit operates at the optimum frequency and maximum efficiency over a wide range of coupling capacitance and load conditions.
An example interface achieves near 80% efficiency at 3.7 W with only 63 pF of coupling capacitance.? An automatic tuning loop adjusts the frequency from 4.2 MHz down to 4 MHz to allow for 25% variation in the nominal coupling capacitance.? The duty cycle is also automatically adjusted to maintain over 70% efficiency for light loads down to 0.3 W.

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