Protection circuit for DC supply

Details Protection circuit for DC supply Protection circuit for DC supply

1995-10-30

1997-06-24

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, 361115, H02H 300

Patent

active

056422512

ABSTRACT:
The disclosure relates to the protection circuits interposed between a DC supply and a load circuit to protect the load circuit against short-circuits or reversals in polarity of the supply. The protection is obtained by means of a MOS power transistor connected between the supply and the load circuit. This transistor is turned on if it receives a voltage Vg from a bias circuit through a control circuit. The bias circuit delivers the voltage Vg only if the voltage given to it by the supply is sufficient while the control circuit turns the power transistor off if the output of the supply gets short-circuited or gives a voltage with reversed polarity.

REFERENCES:
patent: 4686473 (1987-08-01), Chesneau et al.
patent: 4725803 (1988-02-01), Prevot et al.
patent: 4736161 (1988-04-01), Prevot et al.
patent: 4740772 (1988-04-01), Prevot
patent: 4755754 (1988-07-01), Sireul et al.
patent: 4835649 (1989-05-01), Salerno
patent: 4857985 (1989-08-01), Miller
R. A. Maddox, Overcurrent Protector with Automatic Reset; IBM Technical Disclosure Bulletin, vol. 18, No. 8,Jan. 1976, p. 2430.

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