I have a Raspberry Pi that is fed by a powerbank which in turn is fed by a USB wall adapter, and I want to interrupt the power from the powerbank when there is current coming from the AC wall adapter, so I plan to use some type of circuit based on transistors to do this like the red box in the following picture where

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What will be the simplest circuit to do this?

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    \$\begingroup\$ You should be able to use a couple of diodes. The Pi actually works at 3.3V. Put a schottky diode from the wall adapter and a general purpose rectifier from the power bank. \$\endgroup\$ – Indraneel Jan 30 at 6:11
  • \$\begingroup\$ If you really want an UPS, see my answer (to my own question) here electronics.stackexchange.com/questions/347462/… . This page has some info regarding the power supply section of the raspberry pi learn.adafruit.com/… \$\endgroup\$ – Indraneel Jan 30 at 6:26

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