System for detecting incorrect phase rotation

Details System for detecting incorrect phase rotation System for detecting incorrect phase rotation

G - Physics

01

R

G01R 29/18 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2168591

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 (Cu); 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 (Cv or Cw); 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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