Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1996-02-07
1997-10-21
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324521, 324 7677, 363 50, G01R 2500
Patent
active
056800401
ABSTRACT:
A system for automatically detecting whether a power converter or inverter is correctly connected to a three-phase AC power source consisting of first, second, and third phases, the system comprising: a zero-crossing comparator (1) for determining whether the phase of the first-phase voltage (current) is in a positive half cycle or a negative half cycle and generating a first discrimination signal (C.sub.U); a zero-crossing comparator (2, 3) for determining whether the phase of the second- or third-phase voltages (current) is in a positive half cycle or a negative half cycle and generating a second discrimination signal (C.sub.V or C.sub.W); and a D-type flip-flop (5) which detects, in response to the first discrimination signal, that the second discrimination signal is in a predetermined half cycle.
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Kawai Jyoji
Yamamoto Yuushin
Karlsen Ernest F.
Mitsubishi Denki & Kabushiki Kaisha
Solis Jose M.
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