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Phase Hop is when two consecutive half-cycles are in the same direction. If the initial half-cycle is positive and the next half-cycle is positive, this is Phase Hop. The reverse (both negative) is also Phase Hop. This condition can occur in uninterruptible power supplies (UPS).
Phase Hop will drive a standard toroidal transformer into saturation. It is similar to in-rush, but with in-rush the consecutive identical half-cycles have a longer duration between them allowing for other solutions, such as series-thermistors, or relays and resistors. Phase Hop occurs over the course of one and a half cycles – very quickly, usually when a UPS switches from normal mode to battery back-up. Solutions to “handle” Phase Hop need to be transformer-based.
One solution is to gap the toroidal core. This is expensive as the core must treated (coated or vacuum varnished) cut, polished, gapped, glued and secured; plus the core must be larger and more turns added to maintain nominal electrical performance.
PLITRON’s solution is Imin ™ Low Inrush Technology which solves both standard in-rush and Phase Hop without core gapping. We have successfully implemented this technology for many industries, but especially in Power Conditioning products with battery back-up (UPS).
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