JPS54104277A - Abnormality detector for polyphase pulse signal string - Google Patents

Abnormality detector for polyphase pulse signal string

Info

Publication number
JPS54104277A
JPS54104277A JP1043978A JP1043978A JPS54104277A JP S54104277 A JPS54104277 A JP S54104277A JP 1043978 A JP1043978 A JP 1043978A JP 1043978 A JP1043978 A JP 1043978A JP S54104277 A JPS54104277 A JP S54104277A
Authority
JP
Japan
Prior art keywords
abnormality
circuit
signal
pulse signal
scr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1043978A
Other languages
Japanese (ja)
Inventor
Akira Ishibashi
Hiroshi Hirose
Shigeru Nomoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1043978A priority Critical patent/JPS54104277A/en
Publication of JPS54104277A publication Critical patent/JPS54104277A/en
Pending legal-status Critical Current

Links

Landscapes

  • Power Conversion In General (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE: To detect the long-period abnormality of a polyphase pulse signal string, by outputting an abnormality signal when the smoothing output of the logical sum classified by polyphase pulse signals becomes less than a set voltage.
CONSTITUTION: Ignition pulse signal strings S1, S3 and S5 applied to thyristors SCR1, SCR3 and SCR5 are insulated electrically and then detected by pulse detectors 101, 103 and 105 before being waveform-shaped by waveform shaping circuits 111, 113 and 115. Then, their outputs are converted by monostable multivibrators into pulse signal strings of constant width and synthesized by OR circuit OR; the output of OR is converted by smoothing circuit 13 into a DC voltage signal, which is compared with the set voltage from voltage setting circuit 14 by comparator circuit 15. Then, when the signal falls down to the value of the set voltage, the abnormality signal is outputted via latch circuit 16. Since the smoothing circuit is used in this way, a practical abnormality detector can be obtained which detects no extremely-short-period abnormality.
COPYRIGHT: (C)1979,JPO&Japio
JP1043978A 1978-02-03 1978-02-03 Abnormality detector for polyphase pulse signal string Pending JPS54104277A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1043978A JPS54104277A (en) 1978-02-03 1978-02-03 Abnormality detector for polyphase pulse signal string

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1043978A JPS54104277A (en) 1978-02-03 1978-02-03 Abnormality detector for polyphase pulse signal string

Publications (1)

Publication Number Publication Date
JPS54104277A true JPS54104277A (en) 1979-08-16

Family

ID=11750179

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1043978A Pending JPS54104277A (en) 1978-02-03 1978-02-03 Abnormality detector for polyphase pulse signal string

Country Status (1)

Country Link
JP (1) JPS54104277A (en)

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