JPS54118548A - Transistor circuit with protection circuit - Google Patents

Transistor circuit with protection circuit

Info

Publication number
JPS54118548A
JPS54118548A JP2515078A JP2515078A JPS54118548A JP S54118548 A JPS54118548 A JP S54118548A JP 2515078 A JP2515078 A JP 2515078A JP 2515078 A JP2515078 A JP 2515078A JP S54118548 A JPS54118548 A JP S54118548A
Authority
JP
Japan
Prior art keywords
transistor
voltage
output transistor
protection
collector
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
Application number
JP2515078A
Other languages
Japanese (ja)
Inventor
Haruhiko Nozaki
Hiroaki Shimizu
Masahiko Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2515078A priority Critical patent/JPS54118548A/en
Publication of JPS54118548A publication Critical patent/JPS54118548A/en
Pending legal-status Critical Current

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 when collector voltage exceeds predetermined value by the constant monitoring of the collector voltage of output transistor.
CONSTITUTION: The collector of the transistor 4 for protection is connected to the base of the output transistor 2, and also 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 collector of the output transistor and the base of the transistor for protection and voltage is set up so that the sum of the voltage between the base and emitter of the transistor for protection and the Zener voltage of the constant voltage diode is higher than the power voltae of the transistor circuit. Thus, when the power voltage exceeds the specified value, trans- loaded output transistor is made OFF and therefore the output transistor can be protected.
COPYRIGHT: (C)1979,JPO&Japio
JP2515078A 1978-03-06 1978-03-06 Transistor circuit with protection circuit Pending JPS54118548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2515078A JPS54118548A (en) 1978-03-06 1978-03-06 Transistor circuit with protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2515078A JPS54118548A (en) 1978-03-06 1978-03-06 Transistor circuit with protection circuit

Publications (1)

Publication Number Publication Date
JPS54118548A true JPS54118548A (en) 1979-09-14

Family

ID=12157964

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2515078A Pending JPS54118548A (en) 1978-03-06 1978-03-06 Transistor circuit with protection circuit

Country Status (1)

Country Link
JP (1) JPS54118548A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04133616A (en) * 1990-09-21 1992-05-07 Mitsubishi Electric Corp Semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04133616A (en) * 1990-09-21 1992-05-07 Mitsubishi Electric Corp Semiconductor device

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