DEVICE INPUT PROTECTION CIRCUIT

摘要

An input protection circuit for protecting components of an input circuit. The input protection circuit includes a resettable fuse that functions as a current limit integrated circuit to maintain a maximum current so that the circuit can function in a normal operating range with less current. A Zener diode can measure the circuit's voltage and control a metal oxide semiconductor field-effect transistor (MOSEFT) to avoid impact with the analog signal input. The MOSEFT is open if a voltage input is less than a Zener diode breakdown voltage. The Zener diode breakdowns the current flow directly into a ground via the MOSEFT if the voltage input is higher than the Zener diode breakdown voltage. The resettable fuse will shut down until the resettable fuse is reset if the current is higher than the resettable fuse trip current. The protect circuit restarts after the resettable fuse is reset.

主权项

1. An input protection circuit, comprising:
a resettable fuse that acts as a current limit integrated circuit to maintain a maximum current so that said current limit integrated circuit functions in a normal range with less current; and a Zener diode that measures an input circuit voltage and controls a metal oxide semiconductor field-effect transistor to avoid impact with a signal input and thereby limits a voltage input and a current input associated with said input circuit while protecting components of said input circuit from damage.