Overcurrent limitation circuit

Details Overcurrent limitation circuit Overcurrent limitation circuit

2005-07-26

2005-07-26

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

06922321

ABSTRACT:
An overcurrent limitation circuit for use in a direct current stabilization electric power supply circuit controls and drives an output transistor to output a constant voltage in accordance with a difference between a reference voltage and a voltage proportional to the output voltage. The overcurrent limitation circuit includes a proportional output current generating device for generating a current proportional to a current flowing through the output transistor, a current/voltage-converting device for converting an output current flowing from the proportional output current generating device into a voltage, and 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 interrupts the supplying when the output voltage is lower than the prescribed level. A control device is provided so as to control the output transistor to output a current in accordance with an output voltage at a current supplying point of the proportional output current generating device.

REFERENCES:
patent: 5642252 (1997-06-01), Sakamoto et al.
patent: 6373671 (2002-04-01), Watanabe et al.
patent: 6630748 (2003-10-01), Sato et al.
patent: 90221065 (1992-03-01), None
patent: 10-111722 (1998-04-01), None

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