Do PWM-Based AC Control Circuits Using MOSFETs Require ZCD Circuits?

There are two common types of zero-crossing detection (ZCD) circuits: operational amplifiers and passive circuits comprising resistors, capacitors, etc. ZCD circuits are used for detection of zero voltage reference point in an AC signal or in a sinewave signal. A typical zero-crossing detection of the AC signal is shown in Fig. 1. Many PWM-based AC […]

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