The invention discloses an anti-reverse input
system for an automobile controller power supply. The
system comprises a power supply, a
voltage regulation module, a fault protection module, an anti-reverse input circuit and an automobile controller, wherein the power supply is electrically connected with the
voltage regulation module, the
voltage regulation module is in communication connection with the fault protection module, the fault protection module is in communication connection with the anti-reverse input circuit, the anti-reverse input circuit is in communication connection with the automobile controller, and the anti-reverse input circuit comprises a PMOS
transistor, a
diode, a
resistor R1 and a
resistor R2. According to the invention, the anti-reverse input circuit is arranged, the PMOS tube is used for replacing an anti-reverse
diode, and when the controller is just powered on, the PMOS tube is not conducted, and the power supply supplies power to the controller through thefly-wheel
diode of the PMOS tube at the moment, and when the power supply of the controller rises to a certain voltage, the PMOS tube is completely conducted, the controller bypasses the diode, and the power is completely supplied through the PMOS tube, so that the tube
voltage drop of the diode is eliminated.