Connected to terminal J1 is a wireless charging receiving coil (18-20V AC). Is there a more efficient way to produce 12V DC from this with enough power to drive the charging circuit and wifi comms (not shown).
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- Make sure the diodes are good for whatever frequency is being run.
- You're using a linear regulator; the most efficient such a regulator can ever by is \$V_{in}/V_{out}\$. A switching regulator will be much better.
- You can probably get an incremental gain by using a voltage doubler into a switcher, because you'd only have one diode drop in each cycle on the input side -- but then you'd need a switcher that can work from a higher voltage. You'd need to do some up-front engineering to verify what's best.
- A synchronous rectifier feeding a choke input filter may work better -- but the size and complexity may be prohibitive.
answered Oct 15, 2019 at 18:58