Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1986-05-12
1987-10-06
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 90, 361 18, 361 88, H02H 324
Patent
active
046987207
ABSTRACT:
This dynamic protection device is particularly intended for integrated circuits having input MOS stages and logic or analog inputs fed by voltages and/or currents whose value can increase above those bearable with traditional protection systems. The device is composed of a first section for protection against voltages above a first set threshold value and a second protection section against voltages below a set threshold value. The device is made in MOS technology and is disposed between the input of the circuit to be protected and the power supply. The two sections operate as turned off switches with input voltage within the allowed voltage range and selectively turned on outside of that range, such that on the input voltage exceeding the upper threshold the first section switches on absorbing current at the input and conveying it toward the power supply, while on the voltage dropping below the lower threshold the second section becomes active absorbing from the power supply the current and conveying it to the input. The threshold values can be set when designing the device selecting suitable manufacture technologies and implantation levels.
REFERENCES:
patent: 4400625 (1983-07-01), Hussey
patent: 4492876 (1985-01-01), Colbert et al.
Deboer Todd E.
Josif Albert
Modiano Guido
Pellinen A. D.
SGS Microelettronica S.p.A.
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