JPS54116277A - Abnormal voltage detecting circuit - Google Patents
Abnormal voltage detecting circuitInfo
- Publication number
- JPS54116277A JPS54116277A JP2281778A JP2281778A JPS54116277A JP S54116277 A JPS54116277 A JP S54116277A JP 2281778 A JP2281778 A JP 2281778A JP 2281778 A JP2281778 A JP 2281778A JP S54116277 A JPS54116277 A JP S54116277A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- comparator part
- lower limit
- limit value
- 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
Abstract
PURPOSE: To detect abnormal voltage well with a simple and miniature constitution by controlling the releasing of the clamping of DC voltage output by the upper and lower limit supervising comparison output of DC voltage and charging and discharging.
CONSTITUTION: When a DC voltage E reaches the lower limit value or higher at the turning on of power source, the output of a first comparator part 14l to which a reference voltage is being applied inverts and the output of a NOR circuit 61 becomes a high level. This output is clamped by the ground connection of break contacts 51. The clamped voltage is applied to a time constant circuit by a resistance 33 and capacitor 32 via the transistor 35 which is conducted via NOR circuit 62 by the inversion output of the comparator part 14l. After lapse of a specified time, the break contacts 51 are opened by a relay 21, by which the clamp is released. As a result, the stable DC voltage after the lapse of a specified time after rising is outputted from terminal 6. When the DC voltage E exceeds a lower limit value and an upper limit value, the DC output is cut off by the comparator part 14l, second comparator part 14μ. Thereby, the abnormality of the supply DC voltage to an IC, etc. is well detected and controlled.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281778A JPS54116277A (en) | 1978-03-02 | 1978-03-02 | Abnormal voltage detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281778A JPS54116277A (en) | 1978-03-02 | 1978-03-02 | Abnormal voltage detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54116277A true JPS54116277A (en) | 1979-09-10 |
Family
ID=12093232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2281778A Pending JPS54116277A (en) | 1978-03-02 | 1978-03-02 | Abnormal voltage detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54116277A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57188173U (en) * | 1981-05-27 | 1982-11-29 | ||
JPS58212320A (en) * | 1982-05-29 | 1983-12-10 | 富士通電装株式会社 | Feeding current monitoring circuit |
US4634971A (en) * | 1982-09-30 | 1987-01-06 | Ford Motor Company | Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
-
1978
- 1978-03-02 JP JP2281778A patent/JPS54116277A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57188173U (en) * | 1981-05-27 | 1982-11-29 | ||
JPS58212320A (en) * | 1982-05-29 | 1983-12-10 | 富士通電装株式会社 | Feeding current monitoring circuit |
US4634971A (en) * | 1982-09-30 | 1987-01-06 | Ford Motor Company | Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
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