Electronic circuit, has control and protection equipment receiving control signals and information from computers using digital signal voltage, where voltage value of signals is compared with reference value or decision threshold value

摘要

The circuit has a control and protection equipment receiving control signals and information from computers using digital signal voltage, where voltage value of the signals is compared with a reference value or decision threshold value. A resistive divider allows fraction of input voltage to be taken into a comparator, where the input voltage is compared with reference voltage set by a microprocessor that generates a reference signal by pulse width modulation (PWM). Output of the comparator is high when a value of the input voltage is less than a set value.