Protection of a power transistor

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

Reexamination Certificate

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C361S093700, C361S091500

Reexamination Certificate



A method and a circuit for protecting a transistor that controls the supply of an at least partially inductive load, including lowering the demagnetization voltage of the inductive load with respect to a demagnetization voltage set by a break-over component connected between a conduction terminal and the control terminal of the transistor.

patent: 4679112 (1987-07-01), Craig
patent: 5272392 (1993-12-01), Wong et al.
patent: 6054740 (2000-04-01), Barret et al.
patent: 6078204 (2000-06-01), Cooper et al.
patent: 4428675 (1996-02-01), None
patent: 19841227 (2000-03-01), None
“Parallel output drivers for inductive load,”Research Disclosure, 438(22), Kenneth Mason Publications, Hampshire, Great Britain, Oct. 2000.
“Mise en Parallele de Mosfet,”Electronique,36:86-87, CEP Communication, Paris, France, Mar. 1, 1994.


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