VERSATILE INPUT CIRCUIT FOR SENSING THE STATUS OF A VOLTAGE INPUT OVER A WIDE RANGE OF VOLTAGE LEVELS AND WAVEFORMS

摘要

11 An electronic signal conditioning circuit for inputting a wide range of sensed voltage signals of various AC and DC waveforms to a central processing unit of a computer or microprocessor including voltage limiting means such as a zener diode in parallel with a photodiode of an opto coupler and a minimum voltage level activating means for insuring a minimum voltage level is present before activation of the opto coupler. The signal conditioning circuit further includes comparator means for processing the output signal of the opto coupler and rectifying means for rectifying any AC sensing means signal input to the signal conditioning circuit.