Data interface protection circuit

Data interface protection circuit connects between mobile device data interface's feeder ear and bus end, by comparator, the first NMOSFET, second NMOSFET, the first diode, second diode, a DC power supply, the 2nd DC power supply, current -limiting resistor, the first pull -up resistor and second pull -up resistors, the grid of the output connection two NMOSFET of comparator, feeder ear and bus end are connected respectively to the substrate of two NMOSFET to be connected with respective drain electrode, the 2nd DC power supply's magnitude of voltage is greater than a DC power supply. The utility model discloses can realize the effective protection to mobile device USB power output line, no matter USB power output line VBUS takes place all not influence the normal work of mobile device internal circuit to power or shorted to earth, has realized reliable short -circuit protection.