Title:
NEGATIVE-PHASE PROTECTION POWER CONTROL
Document Type and Number:
Japanese Patent JP3249156
Kind Code:
B2
Abstract:
PURPOSE: To prevent a motor with power source by means of a three-phase power supply from reversing and causing an unforeseen accident by comparing a phase difference value between two waveform shaping signals obtained by shaping two-phase voltage waveforms taken out from power given to the motor with a normal phase difference value.
CONSTITUTION: A waveform shaping circuit 21 gives square-waved signals 21A, 21B obtained by shaping two-phase voltage waveforms of a given detection input l2C to the input-output port 24 of CPU 25. Then, the phase difference value between the square-wave signals 21A and 21B is processed by comparison operation by means of a reference value and CPU25. When the phase difference value is within the range of the reference value, a normal signal 25A is given to an operation controller 400 and to a closing circuit 12 so that three-phase power 300 is given as driving power l2B to a motor 200. Also, when the phase difference value is outside the range of the reference value, a phase abnormal signal 25B is given to the phase-changing circuit 11 of an input controller 1 so that predetermined phases are switched and the driving power is changed to positive three phases.
Inventors:
Takashi Kamiyama
Hisao Honda
Yuji Sunaga
Hisao Honda
Yuji Sunaga
Application Number:
JP27640791A
Publication Date:
January 21, 2002
Filing Date:
September 30, 1991
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H02H7/09; H02H7/097; H02P21/05; H02P23/00; H02P23/04; H02P25/10; (IPC1-7): H02H7/097; H02H7/09; H02P7/36
Domestic Patent References:
| JP6046728A | ||||
| JP4271296A | ||||
| JP3106838U |
Attorney, Agent or Firm:
Teruo Akimoto
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