JPH03120643U - - Google Patents
Info
- Publication number
- JPH03120643U JPH03120643U JP3035590U JP3035590U JPH03120643U JP H03120643 U JPH03120643 U JP H03120643U JP 3035590 U JP3035590 U JP 3035590U JP 3035590 U JP3035590 U JP 3035590U JP H03120643 U JPH03120643 U JP H03120643U
- Authority
- JP
- Japan
- Prior art keywords
- output terminal
- transistor
- thermistor
- circuit
- overcurrent
- 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
- 230000002265 prevention Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
第１図は、本考案の一実施例に係るデジタル出
力回路の回路図であり、第２図は、従来のデジタ
ル出力回路を示す回路図である。
２１……内部回路、２２……内部電源、２３…
…フオトカプラ、２４……トランジスタ、２５…
…トランジスタ、２６……抵抗、２７……サーミ
スタ、２８……出力端子。
FIG. 1 is a circuit diagram of a digital output circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional digital output circuit. 21...Internal circuit, 22...Internal power supply, 23...
...Photocoupler, 24...Transistor, 25...
...Transistor, 26...Resistor, 27...Thermistor, 28...Output terminal.
Claims (1)
に対して内部回路を保護するため出用端子の一端
側にサーミスタを設けると共に他端側の出力端子
より、サーミスタ側の出力端子へ抵抗とトランジ
スタを直列に接続させることと、これと並列に、
第２のトランジスタとを設けたことを特徴とする
過電流防止回路。 In a digital output circuit, a thermistor is installed at one end of the output terminal in order to protect the internal circuit against overcurrent from the outside, and a resistor and transistor are connected in series from the output terminal at the other end to the output terminal at the thermistor side. In parallel with this,
An overcurrent prevention circuit comprising a second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3035590U JPH03120643U (en) | 1990-03-23 | 1990-03-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3035590U JPH03120643U (en) | 1990-03-23 | 1990-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03120643U true JPH03120643U (en) | 1991-12-11 |
Family
ID=31533073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3035590U Pending JPH03120643U (en) | 1990-03-23 | 1990-03-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03120643U (en) |
-
1990
- 1990-03-23 JP JP3035590U patent/JPH03120643U/ja active Pending
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