Electronic – What’s the purpose of the full wave diode bridge in this DC-DC power supply

power supplyrectifier

In the following power supply circuit, there is a full wave diode bridge (full wave rectifier?) after the DC Input. I can see how we need a full wave rectifier after an AC input, but why after a DC input? Is it to smooth out power signal?


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Circuitlib Schematic

Best Answer

Looks to me like it's purely for the convenience (and maybe safety) of the user. It allows you to connect the input using any polarity you choose rather forcing a specific polarity on you.