JPS54159838A - Protection unit for control unit using micro computer - Google Patents
Protection unit for control unit using micro computerInfo
- 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
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
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)
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 |
-
1978
- 1978-06-07 JP JP6868678A patent/JPS54159838A/en active Pending
Cited By (5)
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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