Overcurrent preventing device

Details Overcurrent preventing device Overcurrent preventing device

1998-10-27

2000-01-11

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 86, 361 87, 361 79, H02H 300

Patent

active

060143037

ABSTRACT:
An overcurrent prevention circuit which removes noise upon transmission of a signal over a signal line between two devices for which different power supplies are used and prevents overcurrent from flowing through the signal line to prevent an otherwise possible breakdown of the devices or an associated element. Current from a waveform outputting terminal to an external signal line is detected from a voltage drop across a resistance part. Then, in response to a result of the detection, an N-channel D-type MOS transistor which supplies current of an output signal to the waveform outputting terminal is controlled between on and off to interrupt supply of power. Consequently, no overcurrent flows out from the waveform outputting terminal, and a clamp diode for removing noise connected to the waveform outputting terminal does not suffer from a breakdown by overcurrent.

REFERENCES:
patent: 4926288 (1990-05-01), Bradley

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