Power supply for an intrinsically safe circuit

Details Power supply for an intrinsically safe circuit Power supply for an intrinsically safe circuit

1981-07-21

1984-03-20

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 74, 361 93, 361101, H02H 308

Patent

active

044384734

ABSTRACT:
An intrinsically safe power supply employing a binary current interrupter connected between the power source and the electrical load. Normally the load is situated in a potentially dangerous environment, like a coal mine, and the intrinsically safe power supply at a safe remote location, e.g., on the earth's surface. The interrupter has a pass and switching transistor, current sensor, gating circuitry, a flip-flop switch, and means to delay the turning on of the transistor--but not its turning off. If an overcurrent or overvoltage condition is sensed between the input and output of the intrinsically safe power supply, load current will cease to flow. In normal operation, only the current interrupter pass transistor will open. A reset signal from an oscillator internal of the interrupter may be used to reset the flip-flop after actuation or upon its initial setting, thereby causing the flow of power into the load.

REFERENCES:
patent: 2842720 (1958-07-01), Huston
patent: 3051852 (1962-08-01), Mintz et al.
patent: 3496415 (1970-02-01), Ruthenberg et al.
patent: 3573553 (1971-04-01), Mietz

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