Title:
CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2944293
Kind Code:
B2
Abstract:
PURPOSE: To judge power supply frequency and momentary power failure automatically with a simple processing.
CONSTITUTION: A power supply part 7 generates a power supply synchronization signal which requests interrupt in synchronization with a period of a power supply voltage. A timer 3 outputs commands for outputting a signal for judging frequency or that for judging momentary power failure. Then, when the signal output for judging frequency is given, the power supply frequency is judged based on the level of the signal for judging frequency by receiving a next interrupt request according to the power supply synchronization signal. Also, when output of the signal for judging momentary power failure is instructed, the momentary power failure is judged by receiving interrupt according to the signal for judging momentary power failure based on the command, thus eliminating a need for operation except when there is an interrupt request according to the power supply synchronization signal or the signal for judging momentary power failure and judging power supply frequency or momentary power failure automatically with a simple processing.
Inventors:
HIRATA KENGO
Application Number:
JP4834792A
Publication Date:
August 30, 1999
Filing Date:
March 05, 1992
Export Citation:
Assignee:
SHAAPU KK
International Classes:
G01R19/165; G01R23/02; G05B9/02; G06F1/28; H02H7/00; (IPC1-7): G01R19/165; G01R23/02; G05B9/02; G06F1/28; H02H7/00
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Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)