JPS58132436U - Output transistor protection circuit - Google Patents
Output transistor protection circuitInfo
- Publication number
- JPS58132436U JPS58132436U JP2945082U JP2945082U JPS58132436U JP S58132436 U JPS58132436 U JP S58132436U JP 2945082 U JP2945082 U JP 2945082U JP 2945082 U JP2945082 U JP 2945082U JP S58132436 U JPS58132436 U JP S58132436U
- Authority
- JP
- Japan
- Prior art keywords
- output transistor
- transistor
- resistor
- protection circuit
- connection point
- 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.)
- Granted
Links
Landscapes
- Protection Of Static Devices (AREA)
- Electronic Switches (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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来技術を示す回路図、第２図は本考案の一実
施例の回路図、第３図は電流制御限特性を示すグラフで
ある。
１・・・・・・電流制限回路、２・・・・・・断線およ
び短絡検出回路、３． ４． ５． ６． ８． ９・
・・・・・接続点、７・・・・・・マイクロコンピュー
タ、Ｐ・・・・・・電源、ＲＬ・・・・・・負荷、ＴＲ
１・・・・・・出力トランジスタ、ＴＲ２・・・・・・
制御トランジスタ、ＴＲ３・・・・・・トランジスタ、
Ｒ１・・・・・・第１抵抗、Ｒ２・・・・・・第２抵抗
、Ｒ３・・・・・・第３抵抗、Ｒ４・・・・・・第４抵
抗、Ｄ・・・・・・ダイオード。FIG. 1 is a circuit diagram showing the prior art, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a graph showing current control limit characteristics. 1... Current limiting circuit, 2... Disconnection and short circuit detection circuit, 3. 4. 5. 6. 8. 9・
... Connection point, 7 ... Microcomputer, P ... Power supply, RL ... Load, TR
1... Output transistor, TR2...
Control transistor, TR3...transistor,
R1...First resistor, R2...Second resistor, R3...Third resistor, R4...Fourth resistor, D... ·diode.
Claims (1)
れた出力トランジスタを保護するための出力トランジス
タの保護回路において、前記負荷と直流電源との接続点
にはトランジスタのベースが接続され、前記負荷の断線
および短絡時における前記トランジスタのスイッチング
態様の変化に応じて前記断線および短絡を検出する制御
手段が設けられ、この制御手段からは短絡時に前記出力
トランジスタを遮断する信号が出力され、前記直流電源
には第２抵抗および第３抵抗から成る直列回路が接続さ
れ、第２および第３抵抗の接続点には制御トランジスタ
および第４抵抗が直列に接続され、第１抵抗および出力
トランジスタの接続点ならびに制御トランジスタのベー
ス間に順方向にダイオードが接続され、制御トランジス
タおよび第４抵抗の接続点に出力トランジスタのベース
が接続されることを特徴とする出力トランジスタの保護
回路。In an output transistor protection circuit for protecting an output transistor connected between a first resistor connected to a DC power supply and a load, a base of the transistor is connected to a connection point between the load and the DC power supply; A control means is provided for detecting the disconnection and short circuit according to a change in the switching mode of the transistor when the load is disconnected and short-circuited, and this control means outputs a signal to cut off the output transistor at the time of the short circuit, and the DC A series circuit consisting of a second resistor and a third resistor is connected to the power supply, a control transistor and a fourth resistor are connected in series to the connection point between the second and third resistors, and a connection point between the first resistor and the output transistor. and a protection circuit for an output transistor, characterized in that a diode is connected in a forward direction between the bases of the control transistor, and the base of the output transistor is connected to a connection point between the control transistor and the fourth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2945082U JPS58132436U (en) | 1982-03-01 | 1982-03-01 | Output transistor protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2945082U JPS58132436U (en) | 1982-03-01 | 1982-03-01 | Output transistor protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58132436U true JPS58132436U (en) | 1983-09-07 |
| JPH042503Y2 JPH042503Y2 (en) | 1992-01-28 |
Family
ID=30041239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2945082U Granted JPS58132436U (en) | 1982-03-01 | 1982-03-01 | Output transistor protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58132436U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5110976U (en) * | 1974-07-11 | 1976-01-27 |
-
1982
- 1982-03-01 JP JP2945082U patent/JPS58132436U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5110976U (en) * | 1974-07-11 | 1976-01-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH042503Y2 (en) | 1992-01-28 |
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