JPS57131069A - Circuit for detecting voltage variation - Google Patents
Circuit for detecting voltage variationInfo
- Publication number
- JPS57131069A JPS57131069A JP1733781A JP1733781A JPS57131069A JP S57131069 A JPS57131069 A JP S57131069A JP 1733781 A JP1733781 A JP 1733781A JP 1733781 A JP1733781 A JP 1733781A JP S57131069 A JPS57131069 A JP S57131069A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power source
- source voltage
- circuit
- delay circuit
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To make it possible to detect the voltage variation stably and to enable the device to be used in systems having different power source voltage levels, by comparing the difference between the normal power source voltage and the delayed power source voltage with the output which is obtained by multiplying the normal power source voltage by a specified number of times. CONSTITUTION:The power source voltage VA is delayed by a delay circuit 1 by a specified time. The difference between the output voltage VB of said delay circuit 1 and the power source voltage VA is detected by a differential circuit 2. The output voltage VB of the delay circuit 1 is multiplied by K times (K is a constant in an inequality 0<K<1) by a constant multiplying circuit 3. The output voltage VD of said constant multiplying circuit 3 and the output voltage VC of the differential circuit 2 are compared in a comparator 4. In the case of K=0.2, and abnormal voltage detecting signal V'S is outputted when the difference between the power source voltage VA and the output voltage VB of the delay circuit 1 exeeds the 20% of the voltage VB. In this constitution, the abnormal power source voltage can be detected without providing a specific, absolute, preset voltage, and the device can be used in the systems having the different power source voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1733781A JPS57131069A (en) | 1981-02-06 | 1981-02-06 | Circuit for detecting voltage variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1733781A JPS57131069A (en) | 1981-02-06 | 1981-02-06 | Circuit for detecting voltage variation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57131069A true JPS57131069A (en) | 1982-08-13 |
Family
ID=11941229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1733781A Pending JPS57131069A (en) | 1981-02-06 | 1981-02-06 | Circuit for detecting voltage variation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57131069A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005176316A (en) * | 2003-10-31 | 2005-06-30 | Bose Corp | Porting |
-
1981
- 1981-02-06 JP JP1733781A patent/JPS57131069A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005176316A (en) * | 2003-10-31 | 2005-06-30 | Bose Corp | Porting |
| US8107662B2 (en) | 2003-10-31 | 2012-01-31 | Bose Corporation | Porting |
| US8831263B2 (en) | 2003-10-31 | 2014-09-09 | Bose Corporation | Porting |
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