JPS6426323A - Overvoltage protecting circuit - Google Patents
Overvoltage protecting circuitInfo
- Publication number
- JPS6426323A JPS6426323A JP17922787A JP17922787A JPS6426323A JP S6426323 A JPS6426323 A JP S6426323A JP 17922787 A JP17922787 A JP 17922787A JP 17922787 A JP17922787 A JP 17922787A JP S6426323 A JPS6426323 A JP S6426323A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- base
- overvoltage
- voltage
- monitoring
- 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
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To prevent the generation of varieties in the starting voltage of overvoltage protecting operation, by a method wherein the base of an overvoltage detecting transistor is connected to a voltage dividing circuit for monitoring overvoltage to supply only a base current. CONSTITUTION:A voltage Vcc for monitoring an overvoltage is divided by voltage dividing circuits 1, 2 while the dividing point of the circuits 1, 2 is connected to the base of a first transistor 8. A reference voltage generating element 6 is connected to the base of a second transistor 3 and the emittors of the first transistor 8 and the second transistor 3 are connected with each other. The potential of a resistor 4, connected to the collector of the second transistor 3, is impressed on the base of a third transistor 7, operated as a circuit interrupting element. According to this method, only the base current of a transistor is supplied from the voltage dividing circuit, therefore, the fluctuation of an operating point due to the variety of the element will never be generated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17922787A JPS6426323A (en) | 1987-07-20 | 1987-07-20 | Overvoltage protecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17922787A JPS6426323A (en) | 1987-07-20 | 1987-07-20 | Overvoltage protecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6426323A true JPS6426323A (en) | 1989-01-27 |
Family
ID=16062163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17922787A Pending JPS6426323A (en) | 1987-07-20 | 1987-07-20 | Overvoltage protecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6426323A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100828923B1 (en) * | 2001-10-10 | 2008-05-13 | 엘지디스플레이 주식회사 | Prevention Circuit of Over Voltage and Surge Voltage |
-
1987
- 1987-07-20 JP JP17922787A patent/JPS6426323A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100828923B1 (en) * | 2001-10-10 | 2008-05-13 | 엘지디스플레이 주식회사 | Prevention Circuit of Over Voltage and Surge Voltage |
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