Circuit for protection against negative overvoltages across the

Details Circuit for protection against negative overvoltages across the Circuit for protection against negative overvoltages across the

1992-08-17

1993-05-11

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361111, 323284, 3072966, H02H 709

Patent

active

052106756

ABSTRACT:
Circuits are provided for protecting against negative overvoltages of a power supply in an integrated circuit including a power device (P). The protection circuits include a voltage limiting device (T4) interposed between supply and control terminals of the power device, as well as a switching device (T6). The switching device is interposed between a control terminal of the voltage limiting means and ground. The switching means is controlled by the power supply to cause conduction of the voltage limiting means for firing the power device if a positive overvoltage on the supply terminal (CL) of the power device is combined with a negative overvoltage of the power supply (Vb). In some embodiments the switching device and the voltage limiting device are both NPN transistors. In other embodiments the the switching device and the voltage limiting device are both MOS transistors.

REFERENCES:
patent: 4471237 (1982-08-01), Kaplan
patent: 4499673 (1983-03-01), Garrett
patent: 4679112 (1987-07-01), Craig
patent: 4808839 (1988-04-01), Dunn et al.
patent: 4845420 (1989-07-01), Oshizawa
patent: 4962346 (1990-10-01), Maggioni

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