JPS57175261A - Detecting circuit for fluctuation of power supply - Google Patents
Detecting circuit for fluctuation of power supplyInfo
- Publication number
- JPS57175261A JPS57175261A JP6096781A JP6096781A JPS57175261A JP S57175261 A JPS57175261 A JP S57175261A JP 6096781 A JP6096781 A JP 6096781A JP 6096781 A JP6096781 A JP 6096781A JP S57175261 A JPS57175261 A JP S57175261A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- capacitor
- transient
- produces
- 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 obtain a power supply fluctuation detecting circuit which is suited for prevention of an abnormal operation of a circuit that produces a transient state of a power supply switch regardless of the power supply voltage, by making use of the charging/discharging of a capacitor. CONSTITUTION:The anode of a diode 13 is connected to a power supply terminal via a resistance 15, and the cathode is earthed via a capacitor 17 respectively. The emitter of a transistor TR11 is connected to the terminal 5 via a resistance 14, and the base is connected to the cathode of the diode 13 respectively. Thus a charged current flows to the capacitor 17 by the current according to the transient voltage when the power supply is closed, and at the same time the similar current is applied via the corrector of a transistor. Then a TR2 which controls the muting of an echo circuit that produces a fault like a click, etc. in the transient mode is turned on. In the same way, the ON of the TR2 is controlled via a PNP TR12 when the power supply is open. As a result, a power supply fluctuation detecting circuit suited for prevention of the abnormal operation of a circuit that produces a transient condition when the power supply is switched is obtained regardless of the power supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6096781A JPS57175261A (en) | 1981-04-21 | 1981-04-21 | Detecting circuit for fluctuation of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6096781A JPS57175261A (en) | 1981-04-21 | 1981-04-21 | Detecting circuit for fluctuation of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57175261A true JPS57175261A (en) | 1982-10-28 |
Family
ID=13157688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6096781A Pending JPS57175261A (en) | 1981-04-21 | 1981-04-21 | Detecting circuit for fluctuation of power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57175261A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59213799A (en) * | 1983-04-05 | 1984-12-03 | ユニリ−バ−・ナ−ムロ−ゼ・ベンノ−トシヤ−プ | Triglyceride oil esterification and device therefor |
| FR2655737A1 (en) * | 1989-12-08 | 1991-06-14 | Sgs Thomson Microelectronics | INTEGRATED CIRCUIT FAST CHANGE DETECTOR. |
-
1981
- 1981-04-21 JP JP6096781A patent/JPS57175261A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59213799A (en) * | 1983-04-05 | 1984-12-03 | ユニリ−バ−・ナ−ムロ−ゼ・ベンノ−トシヤ−プ | Triglyceride oil esterification and device therefor |
| JPH0229717B2 (en) * | 1983-04-05 | 1990-07-02 | Unilever Nv | |
| FR2655737A1 (en) * | 1989-12-08 | 1991-06-14 | Sgs Thomson Microelectronics | INTEGRATED CIRCUIT FAST CHANGE DETECTOR. |
| EP0450245A2 (en) * | 1989-12-08 | 1991-10-09 | STMicroelectronics S.A. | Detector for rapid variations of the supply voltage of an integrated circuit |
| US5144515A (en) * | 1989-12-08 | 1992-09-01 | SCS-Thomson Microelectronics S.A. | Detector of fast variation in the supply of integrated circuits |
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