Isolated dc converter;-
Linear technology has nice video which last 4:37.
Isolated power supplies Linear
Improved Power-Supply Rejection;-
Maxim integrated has nice web page about it,
- Second-order cascade RC ripple filter
- LC Filter
- An Additional Linear Regulator
Improved Power-Supply Rejection for Linear Regulators
in your case Linear Regulator will does better job than LM2596.
Wireless power;-
Buick cuts the cord: Riviera plug-in concept offers wireless charging
wireless power module,
Wireless Charging Module, Seeedstudio, $7.90