■ FIGURE 8. MAX1811 li-ion battery
charging manager.
Possible Enhancements
with the 08M2, and use an IR circuit
as a proximity detection system.
By using a 08M2 in the receiver, a
two-way communication may be
desirable between the transmitter
and receiver. You may also want to
make a large charging surface area.
A simple way to accomplish this
would be to arrange transmitter
coils wired in parallel. If you make
printed circuit boards, you may want
to create an etched coil for the
receiver that can be scaled to fit the
application.
By utilizing surface-mount
components, the receiver may take
on a near credit card size footprint.
You will want to come up with a way to sense that an
object has been placed on the charging base to keep the
transmitter from running all the time. The most graceful
way to do this would be to design a current-sensing circuit
that trips when a load is introduced.
I currently take advantage of built-in IR commands
Conclusion
Whether you build this project just to study induction
or actually apply it to some recharging end, it is
guaranteed to be challenging for both novice builders and
experienced ones alike. NV
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42
August 2013
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