Purpose of zero crossing

Discussion in 'General Electronics Chat' started by chuyenle, Jun 17, 2013.

  1. chuyenle

    Thread Starter New Member

    Jun 5, 2013
    24
    0
    I have a basic idea what zero cross for but I still don't understand why do we need to have one in the circuit (not every circuit). What is the purpose or benefit of using zero cross that connects to a micro-controller?
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    If you are referring to AC solid-state relays, they use a zero-crossing circuit to trigger the turn-on of the Triac at the zero voltage crossing point of the mains sinewave to minimize the start-up current surge and EMI generation.
     
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