Device for protection against the short circuit of an MOS-type p

Details Device for protection against the short circuit of an MOS-type p Device for protection against the short circuit of an MOS-type p

1990-10-30

1993-01-05

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, H03K 1708, H03K 1714

Patent

active

051776596

ABSTRACT:
The device for protection against the short circuit of an MOS-type power device comprises at least one secondary branch cirucit arranged in parallel with a main branch circuit which includes the power transistor. The secondary branch includes a control MOS transistor having the same characteristics as the power transistor under control and the ability to conduct a current equal to a fraction of that flowing through the power transistor. The gate of the control transistor is connected directly with that of the power transistor. The secondary branch also includes means sensitive to temperature which, in the case of a current flow corresponding to the short circuit current of the power transistor, act on the gate common to the control and to the power transistors so as to lower its voltage and thus limit the conduction of same.

REFERENCES:
patent: 3845405 (1974-10-01), Leidich

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