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Zero Crossing Arc Extinguishing Circuit Disclosure Number: IPCOM000066654D
Original Publication Date: 1979-Apr-01
Included in the Prior Art Database: 2005-Feb-20

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Harding, SR [+details]


This article discloses a simple, reliable and cost-effective relay controlled DC motor starting and braking circuit which senses, during the braking operation, when the 60 Hz AC line voltage goes through a zero crossing. The sensing of at least one zero crossing is sufficient to extinguish substantially any arcing across a DC power supply in the circuit, thereby protecting it from a short circuit condition.