Power supply for an intrinsically safe circuit

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