A bidirectional DC power supply can act as either a source of electricity or a sink for electricity. This means it can deliver electricity to a connected device or circuit. It can also act as a power sink, absorbing electrical energy from a connected device or circuit. Acting as a sink, a bidirectional power supply can effectively consume this excess energy, either returning it to the local grid/building facility in a regenerative system or dissipating excess energy in the form of heat.
A bidirectional power supply can reverse or control the flow, making it useful in myriad applications such as battery testing, regenerative braking systems in electric vehicles or renewable energy systems, to name a few. For example, a bidirectional DC power supply allows for research, testing and other industrial applications that would benefit from the ability to control and reverse the power flow.