JPS54118547A - Transistor circuit with protection circuit - Google Patents
Transistor circuit with protection circuitInfo
- Publication number
- JPS54118547A JPS54118547A JP2514978A JP2514978A JPS54118547A JP S54118547 A JPS54118547 A JP S54118547A JP 2514978 A JP2514978 A JP 2514978A JP 2514978 A JP2514978 A JP 2514978A JP S54118547 A JPS54118547 A JP S54118547A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- voltage
- protection
- output transistor
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To prevent the destruction of output transistor due to the anomaly of power voltage by interrupting the output transistor by the constant monitoring of power voltage when the voltage exceeds predetermined voltage.
CONSTITUTION: The collector of the transistor 4 for protection is connected to the base of the output transistor 2, and the emitter of the transistor for protection is connected to the emitter of the output transistor. And, the constant voltage diode 5 is connected in the reverse direction to between the power source Vcc and the base of the transistor 4 for protection and voltage is set up so that the sum of the voltae between the base and emitter of the transistor 4 for protection and the Zener voltage of the constant voltage diode 5 is higher than the volgage of power source. Thus, when the power voltage exceeds the specified value, trans-loaded output transistor is interrupted, thus protecting the output transistor from destruction.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2514978A JPS54118547A (en) | 1978-03-06 | 1978-03-06 | Transistor circuit with protection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2514978A JPS54118547A (en) | 1978-03-06 | 1978-03-06 | Transistor circuit with protection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54118547A true JPS54118547A (en) | 1979-09-14 |
Family
ID=12157936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2514978A Pending JPS54118547A (en) | 1978-03-06 | 1978-03-06 | Transistor circuit with protection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54118547A (en) |
-
1978
- 1978-03-06 JP JP2514978A patent/JPS54118547A/en active Pending
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