External A/C adapter protecting user against hazardous voltage

Details External A/C adapter protecting user against hazardous voltage External A/C adapter protecting user against hazardous voltage

1998-07-16

1999-09-14

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Personnel safety or limit control features

307125, 307126, 307130, 307139, H03K 1756

Patent

active

059527412

ABSTRACT:
A safe external A/C adapter protecting the user against hazardous, high-voltage D/C output. High voltage is defined as any voltage in excess of 60V D/C. The adapter provides an internal remote ON/OFF circuit that automatically switches the D/C output OFF unless the output plug is seated within a mating socket disposed in an electronic device powered by the adapter. When the output plug is so seated, the hazardous voltage output is inaccessible to the user. In addition, a secondary shutdown circuit is provided that latches off the A/C input in the unlikely event that the remote ON/OFF circuit should fail. The secondary shutdown circuit is largely independent from the primary remote ON/OFF circuit, and can be implemented using control circuitry already present in the adapter. No special mechanical connectors are required. Also, because the D/C output is energized only upon insertion of the D/C output plug into the mating socket, and disabled when the output plug is removed, both the electronic device and the user are protected from electric arcing or sparking.

REFERENCES:
patent: 4591732 (1986-05-01), Neuenschwander
patent: 4704599 (1987-11-01), Kimmel et al.
patent: 4835737 (1989-05-01), Herrig et al.
patent: 4871924 (1989-10-01), Sallati
patent: 4915639 (1990-04-01), Cohn et al.
patent: 4995017 (1991-02-01), Sellati et al.
patent: 5203004 (1993-04-01), Bunton et al.
patent: 5293636 (1994-03-01), Bunton et al.

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