Patent ID: 6970338

Claim:
A power supply device having an overcurrent protection function, comprising: a power supplier, connected to an external peripheral device, for supplying drive power to the peripheral device; a power interrupter for turning the power supplier on/off to determine whether to supply the driver power to the peripheral device; a microcomputer, connected to the power interrupter, for generating a control signal to turn the power interrupter on/off; and an overcurrent protector for turning the power supplier off when an overcurrent is applied to the peripheral device, wherein the overcurrent protector includes; a first resistor connected in series between the microcomputer and the power interrupter; a second resistor having one end connected to both the first resistor and an input terminal of the power interrupter and the other end connected to an output terminal of the power supplier, whereby a voltage according to the ratio of respective resistances of the first and second resistors is applied to a switching device of the power interrupter; and a first diode connected in series between the second resistor and the first resistor.