JPH01147534U - - Google Patents
Info
- Publication number
- JPH01147534U JPH01147534U JP4320188U JP4320188U JPH01147534U JP H01147534 U JPH01147534 U JP H01147534U JP 4320188 U JP4320188 U JP 4320188U JP 4320188 U JP4320188 U JP 4320188U JP H01147534 U JPH01147534 U JP H01147534U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- voltage
- photocoupler
- detection circuit
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Electronic Switches (AREA)
- Dc Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図及び第３図は夫々入力交流電圧波形が正弦波で
ある場合及び方形波である場合を示す波形図、及
び第４図は従来例を示す回路図である。
Ａ，Ｂ……入力端子、Ｃ，Ｄ，Ｅ……出力端子
、１ａ，１ｂ……ダイオード、２ａ，２ｂ……定
電圧ダイオード、３ａ，３ｂ……ダイオード、４
ａ，４ｂ……ＦＥＴトランジスタ、５ａ，５ｂ…
…フオトカプラ、Ｒ１，Ｒ２……抵抗、Ｐ１，Ｐ
２……フオトカプラ。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
3 and 3 are waveform diagrams showing cases where the input AC voltage waveform is a sine wave and a square wave, respectively, and FIG. 4 is a circuit diagram showing a conventional example. A, B... Input terminal, C, D, E... Output terminal, 1a, 1b... Diode, 2a, 2b... Constant voltage diode, 3a, 3b... Diode, 4
a, 4b...FET transistor, 5a, 5b...
...Photocoupler, R1, R2...Resistor, P1, P
2...Photocoupler.
Claims (1)
オトカプラを用いた交流電圧検出回路において、
前記発光ダイオードのアノード側に定電圧ダイオ
ードを接続し、かつ、前記発光ダイオードのカソ
ード側にＦＥＴトランジスタを接続することによ
り、前記発光ダイオードのオン動作開始電圧を一
定化し、かつ、前記発光ダイオードに流れる過大
電流を防止することを特徴とするフオトカプラを
用いた交流電圧検出回路。 In an AC voltage detection circuit using a photocoupler consisting of a light emitting diode and a light receiving element,
By connecting a constant voltage diode to the anode side of the light emitting diode and connecting a FET transistor to the cathode side of the light emitting diode, the on-operation starting voltage of the light emitting diode is made constant, and the voltage flowing to the light emitting diode is made constant. An AC voltage detection circuit using a photocoupler that prevents excessive current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4320188U JPH01147534U (en) | 1988-03-31 | 1988-03-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4320188U JPH01147534U (en) | 1988-03-31 | 1988-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147534U true JPH01147534U (en) | 1989-10-12 |
Family
ID=31269607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4320188U Pending JPH01147534U (en) | 1988-03-31 | 1988-03-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147534U (en) |
-
1988
- 1988-03-31 JP JP4320188U patent/JPH01147534U/ja active Pending