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Polarity agnostic power supply

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Boogami:
Hello,
I want to build a charging dock using an existing 5V USB wall charger. The charging dock will have two pads on which the device that needs to be charged sits with the other two pads. How can I make the charger deliver power no matter the position of the device on those pads? I've used a full bridge rectifier but the voltage drop is too big. Do you know any other circuit that can do the polarity inversion without a voltage drop? I have seen a solution with MOSFETS but I dont know how to choose them for this application.  :-//
Thank you.

LapTop006:
Either use a boost convertor, or perhaps switch from contacts to a Qi charger module (which will probably have such a boost convertor on the output).

SiliconWizard:
First thought is that the solution would have to be integrated in the device to be charged and not in the charger itself, unless it has some means of detecting how the device is plugged? Is that what you had in mind?

ArthurDent:
We could use some more information on the device and charger and how much or little you want to modify them but IsoTip uses a mechanical feature so the device to be charged can only go in one way. Can you design the charger so the device can only contact the pins if it is inserted the correct way?

james_s:
Schottkey diode bridge may have a low enough drop. Synchronous rectifier with low resistance mosfets is an option too.

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