JPS6434833U - - Google Patents
Info
- Publication number
- JPS6434833U JPS6434833U JP1987129128U JP12912887U JPS6434833U JP S6434833 U JPS6434833 U JP S6434833U JP 1987129128 U JP1987129128 U JP 1987129128U JP 12912887 U JP12912887 U JP 12912887U JP S6434833 U JPS6434833 U JP S6434833U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- photocoupler
- series
- circuit
- overvoltage
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- Power Conversion In General (AREA)
Description
第１図は本考案の回路図、第２図は従来回路図
、第３図はフオトカプラの変換効率・温度特性図
、第４図は従来回路における過電圧検出レベル−
温度特性図、第５図は他の実施例の回路図。
１，５，６……抵抗、３……フオトカプラ、４
……ツエナーダイオード、７……サーミスタ、Ｐ
……正極、Ｎ……負極。
Figure 1 is a circuit diagram of the present invention, Figure 2 is a conventional circuit diagram, Figure 3 is a photocoupler conversion efficiency/temperature characteristic diagram, and Figure 4 is an overvoltage detection level in the conventional circuit.
FIG. 5 is a temperature characteristic diagram and a circuit diagram of another embodiment. 1, 5, 6...Resistance, 3...Photocoupler, 4
... Zener diode, 7 ... Thermistor, P
...Positive pole, N...Negative pole.
Claims (1)
第２の抵抗とを直列に接続し、第２の抵抗と並列
にフオトカプラの発光ダイオードとツエナーダイ
オードの直列回路を接続して前記フオトカプラの
フオトトランジスタ側に過電圧信号を出力するも
のにおいて、前記第１の抵抗または第２の抵抗に
フオトカプラの変換効率の温度変化を補償する温
度補償抵抗素子を含む構成としたことを特徴とす
る過電圧検出回路。 A first resistor and a second resistor are connected in series between the main circuit DC bus bars of the inverter, and a series circuit of a light emitting diode and a Zener diode of a photocoupler is connected in parallel with the second resistor, and a phototransistor of the photocoupler is connected. 1. An overvoltage detection circuit for outputting an overvoltage signal to the side, characterized in that the first resistor or the second resistor includes a temperature compensation resistance element that compensates for temperature changes in conversion efficiency of a photocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987129128U JPS6434833U (en) | 1987-08-27 | 1987-08-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987129128U JPS6434833U (en) | 1987-08-27 | 1987-08-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6434833U true JPS6434833U (en) | 1989-03-03 |
Family
ID=31383115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987129128U Pending JPS6434833U (en) | 1987-08-27 | 1987-08-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6434833U (en) |
-
1987
- 1987-08-27 JP JP1987129128U patent/JPS6434833U/ja active Pending