Zero Crossing Detector

Zero crossing detector is a voltage comparator that changes the o/p between +Vsat & –Vsat when the i/p crosses zero reference voltage. In simple words, the comparator is a basic operational amplifier used to compare two voltages simultaneously and changes the o/p according to the comparison. In the same way, we can say ZCD is a comparator. Zero crossing detector circuit is used to produce an o/p stage switch whenever the i/p crosses the reference i/p and it is connected to the GND terminal. The o/p of the comparator can drive various outputs such as an LED indicator, a relay, and a control gate.