voltage zero-crossing triggering
switching at voltage zero-crossing of contactor
voltage zero-crossing point
voltage-zero triggering
zero crossing triggering
zero voltage zero current switching
zero-voltage triggering
zero-voltage zero-current soft-switching
Zero-Voltage Zero-Current Switching
Zero-voltage zero-current transition
zero-voltage zero-current-switching
zero-voltage-zero-current
A new phase locking method with zero crossing
average zero-crossing rate
back EMF zero-crossing detection
back EMF zero-crossing point detection
back-EMF zero-crossing detection
bus line zero voltage protection