JPS6295432U - - Google Patents
Info
- Publication number
- JPS6295432U JPS6295432U JP18415185U JP18415185U JPS6295432U JP S6295432 U JPS6295432 U JP S6295432U JP 18415185 U JP18415185 U JP 18415185U JP 18415185 U JP18415185 U JP 18415185U JP S6295432 U JPS6295432 U JP S6295432U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- control transistor
- overcurrent protection
- protection circuit
- feedback loop
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案回路の一例を示す接続図、第２
図はその過電流保護特性を示す線図、第３図は従
来回路の接続図、第４図はその過電流保護特性を
示す線図である。
Ｌ……負荷、Ｑ１……制御トランジスタ、Ｑ２
……トランジスタ、Ｑ３……スイツチングトラン
ジスタ、Ｒ１……検出抵抗、Ｒ２，Ｒ３，Ｒ４…
…抵抗。
Figure 1 is a connection diagram showing an example of the circuit of the present invention;
FIG. 3 is a diagram showing the overcurrent protection characteristics, FIG. 3 is a connection diagram of a conventional circuit, and FIG. 4 is a diagram showing the overcurrent protection characteristics. L...Load, Q1 ...Control transistor, Q2
...Transistor, Q3 ...Switching transistor, R1 ...Detection resistor, R2 , R3 , R4 ...
…resistance.
Claims (1)
スタと、負荷電流を検出する検出抵抗と、この検
出抵抗に生ずる電圧に応じて前記制御トランジス
タのベース電流をバイパスするように作動する第
２のトランジスタと、前記制御トランジスタのコ
レクタ電位を第２のトランジスタのベースに正帰
還する正帰還ループとを備えた過電流保護回路に
おいて、前記正帰還ループを周期的にオン／オフ
するスイツチを設けたことを特徴とする過電流保
護回路。 a control transistor that controls a load current flowing through the load; a detection resistor that detects the load current; a second transistor that operates to bypass the base current of the control transistor in accordance with a voltage generated in the detection resistor; The overcurrent protection circuit includes a positive feedback loop that positively feeds back the collector potential of the control transistor to the base of the second transistor, further comprising a switch that periodically turns on and off the positive feedback loop. Overcurrent protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985184151U JPH0428185Y2 (en) | 1985-11-29 | 1985-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985184151U JPH0428185Y2 (en) | 1985-11-29 | 1985-11-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6295432U true JPS6295432U (en) | 1987-06-18 |
| JPH0428185Y2 JPH0428185Y2 (en) | 1992-07-08 |
Family
ID=31131553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985184151U Expired JPH0428185Y2 (en) | 1985-11-29 | 1985-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428185Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58174941U (en) * | 1982-05-18 | 1983-11-22 | 三菱電機株式会社 | DC current limiter |
| JPS60124045U (en) * | 1984-01-31 | 1985-08-21 | 富士電機株式会社 | Output transistor protection circuit |
| JPS60167014A (en) * | 1984-02-08 | 1985-08-30 | Toyo Commun Equip Co Ltd | Automatic resetting type overload protecting circuit |
-
1985
- 1985-11-29 JP JP1985184151U patent/JPH0428185Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58174941U (en) * | 1982-05-18 | 1983-11-22 | 三菱電機株式会社 | DC current limiter |
| JPS60124045U (en) * | 1984-01-31 | 1985-08-21 | 富士電機株式会社 | Output transistor protection circuit |
| JPS60167014A (en) * | 1984-02-08 | 1985-08-30 | Toyo Commun Equip Co Ltd | Automatic resetting type overload protecting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0428185Y2 (en) | 1992-07-08 |