The best application example of a BPS can be seen in all MOSFET based commercial SSR designs. Meaning, the points "A" and "B" of the BPS can be used as interchangeable input/output terminals. The action can be reversed by simply changing the voltage polarity. Here, we can see a positive voltage is applied at point "A" of the switch and a negative potential is applied at point "B", which allows the current to flow across "A" to "B". Since it is able to conduct across both ways, a bidirectional switch can be compared and symbolized as a normal ON/OFF switch as shown below: A bidirectional power switch (BPS) is an active device built using MOSFETs or IGBTs, which allows a two way bidirectional flow of current when powered ON, and blocks a bidirectional flow of voltage when powered OFF.
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