Intrinsically safe circuits

Details Intrinsically safe circuits Intrinsically safe circuits

1998-05-22

2000-08-29

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361119, H02H 320

Patent

active

061117382

ABSTRACT:
An intrinsically safe circuit for use in a hazardous environment includes a plurality of circuit sectors (1, 2) which are substantially isolated physically from one another by an electrical insulator, such as air, and are electrically connected, directly or indirectly, so as to define at lease one power transfer path (P1) between each circuit sector (1) and the other circuit sector (2) ; and power limiting means such as resistors (R1, R2) provided in each power transfer path between the connected circuit sectors for limiting the maximum power transfer value therebetween to a value less than a predetermined threshold value at which combustion in said hazardous environment is initiated. The circuit sectors (1, 2) having at least one power transfer path (P1) defined therebetween may have different sparking voltages, in which case voltage clamping means such as Zener diodes (Z1, Z2) is provided in each power transfer path between the two circuit sectors having different sparking voltages, for reducing the maximum voltage which may be applied by one of the two circuit sectors to the other.

REFERENCES:
patent: 4954923 (1990-09-01), Hoeflich et al.
patent: 5113303 (1992-05-01), Herres

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