JPS54103658A - Protective circuit - Google Patents
Protective circuitInfo
- Publication number
- JPS54103658A JPS54103658A JP928378A JP928378A JPS54103658A JP S54103658 A JPS54103658 A JP S54103658A JP 928378 A JP928378 A JP 928378A JP 928378 A JP928378 A JP 928378A JP S54103658 A JPS54103658 A JP S54103658A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- positive feedback
- circuit
- trq3
- input
- 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 increase the response velocity, to ensure an accurate setting of protective action point and also the prevent the malfunction by using the positive feedback circuit for the amplifier circuit which receives the output signals of the fault detector circuit.
CONSTITUTION: With increment of input voltage VIN, the collector potential of transistor TrQ3. And TrQ4 is switched off with TrQ5 switched on respectively, and output voltage VOUT is lowered. As a result, the current of positive feedback circuit 6 decreases, and accordingly the collector potential of TrQ3 decreases quickly. With decrement of input voltage VIN, output voltage VOUT is changed to a high level contrarily, and thus the positive feedback voltage to TrQ3 is increased quickly at input voltage VT2. TrQ1 and Q2 operated according to the change of the output voltage, and thus the voltage of coil 5 varies suddenly. Thus, contact SW is opened to protect both the circuit and the load in case the abnormal voltage is detected. At the same time, the input threshold voltage features VT1 and VT2 plus the hysteresis characteristics due to the value of the positive feedback current.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP928378A JPS54103658A (en) | 1978-02-01 | 1978-02-01 | Protective circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP928378A JPS54103658A (en) | 1978-02-01 | 1978-02-01 | Protective circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54103658A true JPS54103658A (en) | 1979-08-15 |
Family
ID=11716138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP928378A Pending JPS54103658A (en) | 1978-02-01 | 1978-02-01 | Protective circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54103658A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57142009A (en) * | 1981-02-27 | 1982-09-02 | Nec Corp | Protection circuit |
JPS6230411U (en) * | 1985-08-08 | 1987-02-24 | ||
JPH03256533A (en) * | 1990-03-02 | 1991-11-15 | Shikoku Sogo Kenkyusho:Kk | System linkage system |
JPH0888937A (en) * | 1994-09-16 | 1996-04-02 | Nishishiba Electric Co Ltd | Protecting equipment of interconnected system |
-
1978
- 1978-02-01 JP JP928378A patent/JPS54103658A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57142009A (en) * | 1981-02-27 | 1982-09-02 | Nec Corp | Protection circuit |
JPS6367767B2 (en) * | 1981-02-27 | 1988-12-27 | Nippon Electric Co | |
JPS6230411U (en) * | 1985-08-08 | 1987-02-24 | ||
JPH03256533A (en) * | 1990-03-02 | 1991-11-15 | Shikoku Sogo Kenkyusho:Kk | System linkage system |
JPH0888937A (en) * | 1994-09-16 | 1996-04-02 | Nishishiba Electric Co Ltd | Protecting equipment of interconnected system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS54103658A (en) | Protective circuit | |
JPS54109523A (en) | Air fuel ratio controller | |
JPS5480095A (en) | Agc system for optical receiver | |
JPS57107618A (en) | Power amplifier | |
JPS5437448A (en) | Overload detecting circuit of power amplifier | |
JPS52102657A (en) | Transistor amplifier circuit | |
JPS5794819A (en) | Current control system of constant voltage circuit | |
JPS5616311A (en) | Transistor circuit | |
JPS56109012A (en) | Automatic gain control circuit | |
JPS55120225A (en) | Semiconductor breaker | |
JPS54161304A (en) | Amplifying device | |
JPS5559515A (en) | Constant current circuit | |
JPS5723318A (en) | Comparator using programable unijunction transistor | |
JPS55112038A (en) | Bootstrap-type circuit | |
JPS55624A (en) | Return signal misdetection preventing circuit | |
JPS5546482A (en) | Capacitor type x-ray equipment | |
JPS56149107A (en) | Automatic gain control circuit | |
JPS5422553A (en) | Constant voltage circuit | |
JPS54143183A (en) | Temperature detecting circuit | |
JPS57186811A (en) | Amplifier | |
JPS5455109A (en) | Controller for signal level | |
JPS57206103A (en) | Amplifying circuit | |
JPS55143447A (en) | High-voltage controlling circuit for feedback contactless electrometer | |
JPS52122825A (en) | Dc-dc converter | |
JPS5611521A (en) | Direct current stabilized power supply unit |