Abstract: If we want to make the current of circuit to flow in only unidirectional. Typically, a diode would be adopted to control the current flow in only one direction that is from the high voltage side flows to the low voltage side. Traditionally, the voltage drop of a diode is about 0.6V. However, when a forward voltage is applied to the diode, the voltage drop across the diode actually exceeds 1V. If the forward current through the diode is about 10A, that will result the power loss from the diode is about 10W. In order to reduce this power consumption, another approach can use the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) to replace the diode to reduce conduction loss. But, when the MOSFET is turned on, it's current can flow in both directions. This paper proposed a novelty method for control PMOS unidirectional current flow. Only a few passive components are required, the PMOS will be driven to conduct only one direction, which provides a simple and economical solution for circuit application.

Keywords: MOSFET, diode, unidirectional, forward current, forward voltage.

| DOI: 10.17148/IARJSET.2022.9904