Patent ID: 6922321

Claim:
A direct current stabilization electric power supply circuit comprising: an over current limitation circuit for driving and controlling an output transistor to output constant voltage in accordance with an output from a differential amplifier for amplifying a difference between a reference voltage and a voltage proportional to the output voltage, said overcurrent limitation circuit comprising: a proportional output current generating device configured to generate a current proportional to a current flowing through the output transistor; a current/voltage converting device configured to convert an output current from the proportional output current generating device into a voltage; a switching device configured to supply the current/voltage converting device with the output current from the proportional output current generating device when the output voltage is higher than a prescribed level, and interrupt the supplying when the output voltage is lower than the prescribed level; and a control device configured to control the output transistor to output a current in accordance with an output voltage at a drain of the proportional output current generating device.