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It is common to find these cheap Backup Battery Switching on the internet. But the issue I have with these ones is the load gets reset when switching from the main source to the battery. It seems like there is a delay during switching of the relay. Could this be improved by designing a transistor-based switch?

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    \$\begingroup\$ Could this be improved? Yes. Does that answer your question? \$\endgroup\$
    – Transistor
    Jul 25, 2020 at 1:29
  • \$\begingroup\$ MOSFET- based ORing controller? \$\endgroup\$
    – user156429
    Jul 25, 2020 at 2:02

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It seems like there is a delay during switching of the relay.

The relay is a "break-before-make" type switch. This results in a momentarily cut of the load's supply.

Could this be improved by designing a transistor-based switch?

You have a few options. These two came to my mind:

  • Have a circuit that is a type of "make-before-break" -- can be done with either mechanical elements (relays) or semiconductors (diode power-ORs or MOSFETs).
  • Placing a sufficiently large capacitor across the load's supply so that it keeps supplying the load during the momentarily cut -- this can be impractical as the required capacitance can be tens of thousands of micro-Farads.
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