A simple reverse current blocking circuit

When the direction of system current is opposite to the normal operating direction, it is called reverse current. Causes include reverse battery connection, multiple power supply parallel connection, the car starting process, etc. For example, in a battery application, if the battery polarity is reversed, reverse current will flow. The reverse current may damage internal circuits or power supplies, resulting in damage to sensitive components such as polarized low-voltage capacitors and precision ICs. Therefore, it is necessary to reduce or even block the reverse current. This paper proposes a simple reverse current blocking circuit without an additional control IC. It only requires a combination of passive components and a control NMOS to achieve reverse current blocking. The simulation results verify the feasibility of the proposed circuit.