20-200ms Timer Circuit for Circuit Interrupter

Discussion in 'General Electronics Chat' started by mizzu, Apr 23, 2010.

  1. mizzu

    Thread Starter New Member

    Apr 28, 2009
    3
    0
    We are in the middle of a test per DO-160F. One test requires that we interupt the 115vac single phase power for 20ms then again for 200ms. Does anyone have a simple schematic and parts to build such a timer/interupter.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, 20mS would be 1.2 cycles at 60Hz. You might switch a TRIAC off at a zero crossing point, and then wait for 1.2 complete cycles to go through, and switch it back on.

    However, DO-160F refers to avionics. Is your source 400Hz 115v AC, as is typical of aircraft? In that case, it would be 8 complete cycles for 20mS, and 80 cycles for 200mS.
     
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