JPS60124045U - Output transistor protection circuit - Google Patents

Output transistor protection circuit

Info

Publication number
JPS60124045U
JPS60124045U JP1184784U JP1184784U JPS60124045U JP S60124045 U JPS60124045 U JP S60124045U JP 1184784 U JP1184784 U JP 1184784U JP 1184784 U JP1184784 U JP 1184784U JP S60124045 U JPS60124045 U JP S60124045U
Authority
JP
Japan
Prior art keywords
transistor
output transistor
base
protection circuit
constant current
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
JP1184784U
Other languages
Japanese (ja)
Inventor
清 谷川
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP1184784U priority Critical patent/JPS60124045U/en
Publication of JPS60124045U publication Critical patent/JPS60124045U/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の出力トランジスタの保護回路の一例を示
す結線図、第２図および第３図はそれぞれ本考案による
出力トランジスタの保護回路の異なる実施例を示す結線
図である。 １・・・出力トランジスタ、５・・・分路トランジスタ
、８・・・第１の定電流回路を構成する定電流トランジ
スタ、９，１０・・・第２の定電流回路を構成するトラ
ンジスタ、１３・・・コンデンサ。FIG. 1 is a wiring diagram showing an example of a conventional output transistor protection circuit, and FIGS. 2 and 3 are wiring diagrams showing different embodiments of the output transistor protection circuit according to the present invention. DESCRIPTION OF SYMBOLS 1... Output transistor, 5... Shunt transistor, 8... Constant current transistor forming the first constant current circuit, 9, 10... Transistor forming the second constant current circuit, 13 ...Capacitor.

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] （１）コレクタ・エミッタが出力トランジスタのベース
とエミッタとの間に接続され、ベースが入力抵抗を介し
てエミッタに接続された分路トランジスタ、エミッタに
直列に抵抗が接続されるとともにベースが出力トランジ
スタのベースに接続され、該出力トランジスタと第１の
定電流回路を構成する定電流トランジスタおよび゛ベー
スが共通に接続された二つのトランジスタの一方が前記
分路トランジスタのベースに接続され、他方が前記定電
流トランジスタのコレクタに接続された第２の定電流回
路からなることを特徴とする出力トランジスタの保護回
路。(1) A shunt transistor whose collector-emitter is connected between the base and emitter of an output transistor, and whose base is connected to the emitter through an input resistor, and a shunt transistor whose collector and emitter are connected in series with the emitter and whose base is connected to the output transistor. A constant current transistor is connected to the base of the shunt transistor and constitutes a first constant current circuit with the output transistor, and one of two transistors whose bases are connected in common is connected to the base of the shunt transistor, and the other is connected to the base of the shunt transistor. A protection circuit for an output transistor, comprising a second constant current circuit connected to a collector of a constant current transistor. （２）実用新案登録請求の範囲第１項記載の出力トラン
ジスタの保護回路において、分路トランジスタが第２の
定電流回路の一方のトランジスタにより充放電されるコ
ンデンサの端子電圧によりされることを特徴とする出力
トランジスタの保護回路。(2) Utility Model Registration The protection circuit for the output transistor according to claim 1 is characterized in that the shunt transistor is operated by the terminal voltage of a capacitor that is charged and discharged by one transistor of the second constant current circuit. A protection circuit for the output transistor.
JP1184784U 1984-01-31 1984-01-31 Output transistor protection circuit Pending JPS60124045U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1184784U JPS60124045U (en) 1984-01-31 1984-01-31 Output transistor protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1184784U JPS60124045U (en) 1984-01-31 1984-01-31 Output transistor protection circuit

Publications (1)

Publication Number Publication Date
JPS60124045U true JPS60124045U (en) 1985-08-21

Family

ID=30494351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1184784U Pending JPS60124045U (en) 1984-01-31 1984-01-31 Output transistor protection circuit

Country Status (1)

Country Link
JP (1) JPS60124045U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295432U (en) * 1985-11-29 1987-06-18
JPH0559333U (en) * 1992-01-17 1993-08-06 株式会社アドバンテスト Feedback type constant current source circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55128908A (en) * 1979-03-27 1980-10-06 Toshiba Corp Transistor protective circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55128908A (en) * 1979-03-27 1980-10-06 Toshiba Corp Transistor protective circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295432U (en) * 1985-11-29 1987-06-18
JPH0559333U (en) * 1992-01-17 1993-08-06 株式会社アドバンテスト Feedback type constant current source circuit

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