Title:
PHASE CONTROL CIRCUIT OF 3-PHASE CONTROL RECTIFIER
Document Type and Number:
Japanese Patent JPS61285069
Kind Code:
A
Abstract:
PURPOSE:To always stably control a rectifier without influence of an input power source frequency by judging the phase rotation in a D flip-flop with a rectangular wave formed by selecting two of 3-phase AC inputs and shaping the waveforms as a reference. CONSTITUTION:A rectangular wave output from the first waveform shaper 14 is applied through an amplifier 21 to the D input of a D flip-flop 22. The rectangular wave output from the second waveform shaper 15 is applied as a clock of the flip-flop 22 through an inverter 17 to a C input. The D flip-flop detects normal and reverse phase rotations, and outputs detection signals from output terminals Q, -Q as positive and negative direction detection signals. The phase rotating directions are judged on the basis of the detection signals.
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Inventors:
SEIGAN JIYUNICHI
Application Number:
JP12529785A
Publication Date:
December 15, 1986
Filing Date:
June 10, 1985
Export Citation:
Assignee:
NIPPON ELECTRIC IND
International Classes:
H02M7/155; G05F1/455; H02M1/08; H02M1/084; H02M7/12; (IPC1-7): G05F1/455; H02M1/08; H02M7/155
Attorney, Agent or Firm:
Takeo Masuda