Overcurrent protection circuit

Details Overcurrent protection circuit Overcurrent protection circuit

2009-09-16

2011-12-06

Nguyen, Tai T (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S665000, C340S331000, C340S604000, C340S605000, C340S691800, C361S091300, C361S101000, C324S424000

Reexamination Certificate

active

08072342

ABSTRACT:
An overcurrent protection circuit connected between a voltage input and a voltage output of an electronic device to protect against excessive current is disclosed. The overcurrent protection circuit includes first to fifth resistors, a relay comprising a coil and a normally closed switch, a pnp transistor, and a break-over element. When a current between the voltage input and the voltage output is greater or equal to a rated current of the electronic device, the npn transistor is turned on, while the coil is powered on to control the switch to be opened, therefore the voltage output cannot output voltage, which can protect against excessive current damaging the electronic device.

REFERENCES:
patent: 4680664 (1987-07-01), Leuthen
patent: 6788128 (2004-09-01), Tsuchida
patent: 2010/0156324 (2010-06-01), Nagase et al.

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