JPS54159838A - Protection unit for control unit using micro computer - Google Patents

Protection unit for control unit using micro computer

Info

Publication number
JPS54159838A
JPS54159838A JP6868678A JP6868678A JPS54159838A JP S54159838 A JPS54159838 A JP S54159838A JP 6868678 A JP6868678 A JP 6868678A JP 6868678 A JP6868678 A JP 6868678A JP S54159838 A JPS54159838 A JP S54159838A
Authority
JP
Japan
Prior art keywords
power source
transistor
capacitor
discharged
micro computer
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
JP6868678A
Other languages
Japanese (ja)
Inventor
Osamu Takahashi
Yoshiyuki Honda
Youshi Ootsuka
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6868678A priority Critical patent/JPS54159838A/en
Publication of JPS54159838A publication Critical patent/JPS54159838A/en
Pending legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE: To prevent important dangers such as damage from being caused by the abnormal operation of controlled elements, by performing surely an initial reset at a power source restoration time after the breaking of a commercial power source dependent upon instantaneous power failure.
CONSTITUTION: When commercial power source 1 is broken, transistor 11 is opened, and output voltage A of DC power source 4 starts lowering gradually. Meanwhile, capacitor 16 is not discharged, and the voltage value rises, and consequently, transistor 20 is closed. As a result, the charge charged in capacitor 5 with a polarity shown in the figure is discharged. Next, when power source 1 is restored, the charge of capacitor 16 is discharged through transistor 11, and transistor 20 is opened. Consequently, a high voltage approximately equal to the output voltage of DC power source 4 is applied to the initial reset terminal of micro computer 7 at a restoration time of power source 1, thus making it possible to reset to program counter to the initial state.
COPYRIGHT: (C)1979,JPO&Japio
JP6868678A 1978-06-07 1978-06-07 Protection unit for control unit using micro computer Pending JPS54159838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6868678A JPS54159838A (en) 1978-06-07 1978-06-07 Protection unit for control unit using micro computer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6868678A JPS54159838A (en) 1978-06-07 1978-06-07 Protection unit for control unit using micro computer

Publications (1)

Publication Number Publication Date
JPS54159838A true JPS54159838A (en) 1979-12-18

Family

ID=13380862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6868678A Pending JPS54159838A (en) 1978-06-07 1978-06-07 Protection unit for control unit using micro computer

Country Status (1)

Country Link
JP (1) JPS54159838A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694928A (en) * 1979-12-27 1981-07-31 Matsushita Electric Ind Co Ltd Power source
JPS58142722A (en) * 1982-02-19 1983-08-24 松下電器産業株式会社 Drive circuit for relay
JPS6135615A (en) * 1984-07-27 1986-02-20 Omron Tateisi Electronics Co Power supply reset circuit of contactless switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694928A (en) * 1979-12-27 1981-07-31 Matsushita Electric Ind Co Ltd Power source
JPS58142722A (en) * 1982-02-19 1983-08-24 松下電器産業株式会社 Drive circuit for relay
JPH0441445B2 (en) * 1982-02-19 1992-07-08 Matsushita Electric Ind Co Ltd
JPS6135615A (en) * 1984-07-27 1986-02-20 Omron Tateisi Electronics Co Power supply reset circuit of contactless switch
JPH0558287B2 (en) * 1984-07-27 1993-08-26 Omron Tateisi Electronics Co

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