Overcurrent limitation and output short-circuit protection...

Details Overcurrent limitation and output short-circuit protection... Overcurrent limitation and output short-circuit protection...

2011-07-05

2011-07-05

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

07974060

ABSTRACT:
A disclosed overcurrent protection and output short-circuit protection circuit has a proportional output current generation unit and a first current voltage conversion unit provided in series between a first power supply terminal and an output terminal. Furthermore, the overcurrent protection and output short-circuit protection circuit has a control unit that operates based on a difference between a voltage generated at the first current voltage conversion unit and that generated at a second current voltage conversion unit provided between the first power supply terminal and a second power supply terminal. A current flowing to the second current voltage conversion unit is changed by one or more switching elements in a stepwise manner based on the output voltages of the output transistor when supplying the current, thereby changing the voltages generated at both ends of the second current voltage conversion unit.

REFERENCES:
patent: 7183755 (2007-02-01), Itoh et al.
patent: 2003/0128489 (2003-07-01), Katoh et al.
patent: 2008/0285198 (2008-11-01), Morino
patent: 3782726 (2006-03-01), None
patent: 2006-178539 (2006-07-01), None

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