JPH02125529U - - Google Patents
Info
- Publication number
- JPH02125529U JPH02125529U JP3235289U JP3235289U JPH02125529U JP H02125529 U JPH02125529 U JP H02125529U JP 3235289 U JP3235289 U JP 3235289U JP 3235289 U JP3235289 U JP 3235289U JP H02125529 U JPH02125529 U JP H02125529U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- load
- current
- current detection
- detection resistor
- 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
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
第1図及び第2図は本考案の第1の実施例を示
し、第1図は電気的構成の概略図、第2図はトラ
ンジスタの安全動作領域と本考案の動作点を示す
作用説明図であり、第3図は本考案の第2の実施
例を示す第1図相当図である。
図面中、1及び14はトランジスタ、2は電流
検知用抵抗、4は負荷回路(負荷)、5及び15
は限時回路、6乃至9及び16は充電用抵抗、1
0はコンデンサ、11は比較回路、12は駆動回
路、13は制御回路である。
1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic diagram of the electrical configuration, and FIG. 2 is an operational explanatory diagram showing the safe operating area of the transistor and the operating point of the present invention. FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention. In the drawing, 1 and 14 are transistors, 2 is a current detection resistor, 4 is a load circuit (load), and 5 and 15
is a time limit circuit, 6 to 9 and 16 are charging resistors, 1
0 is a capacitor, 11 is a comparison circuit, 12 is a drive circuit, and 13 is a control circuit.
Claims (1)
駆動するものにおいて、前記トランジスタの負荷
電流を検知する電流検知用抵抗と、この電流検知
用抵抗の端子電圧を入力とする充電用抵抗及びコ
ンデンサからなる限時回路と、前記コンデンサの
充電電圧が設定値を越えたときに前記トランジス
タのベース電流を遮断する制御回路とを具備して
なる負荷駆動回路。 In a device that drives a load using a transistor as a switching element, a current detection resistor for detecting the load current of the transistor, a time-limiting circuit comprising a charging resistor and a capacitor to which a terminal voltage of the current detection resistor is input; A load drive circuit comprising: a control circuit that cuts off the base current of the transistor when the charging voltage of the capacitor exceeds a set value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3235289U JPH02125529U (en) | 1989-03-22 | 1989-03-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3235289U JPH02125529U (en) | 1989-03-22 | 1989-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02125529U true JPH02125529U (en) | 1990-10-16 |
Family
ID=31535315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3235289U Pending JPH02125529U (en) | 1989-03-22 | 1989-03-22 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02125529U (en) |
-
1989
- 1989-03-22 JP JP3235289U patent/JPH02125529U/ja active Pending
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