JPS63193321U - - Google Patents
Info
- Publication number
- JPS63193321U JPS63193321U JP8212187U JP8212187U JPS63193321U JP S63193321 U JPS63193321 U JP S63193321U JP 8212187 U JP8212187 U JP 8212187U JP 8212187 U JP8212187 U JP 8212187U JP S63193321 U JPS63193321 U JP S63193321U
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- detection circuit
- level sensor
- oil level
- 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.)
- Granted
Links
- 238000009413 insulation Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 4
- 239000004065 semiconductor Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案の実施例の回路図、第２図は本
考案の他の実施例の回路図、第３図は第２図に示
す回路に電圧フオロワとして作用するオペアンプ
１１を設けた回路図、第４図は本考案の他の実施
例の回路図、第５図はオペアンプ１の−側入力端
子の電圧Ｖａを示すグラフ、第６図はダイオード
４と電極５との接続点電位の特性を示すグラフ、
第７図は温度と絶縁抵抗との関係を示すグラフ、
第８図は従来例の回路図である。
符号説明、１，１１……オペアンプ、２，３，
１２……抵抗器、４……ダイオード、４′……ツ
エナーダイオード、５……電極、６……オイル、
８……負側電極、１０……サーミスタ。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram of another embodiment of the invention, and Fig. 3 is a circuit in which an operational amplifier 11 acting as a voltage follower is added to the circuit shown in Fig. 2. 4 is a circuit diagram of another embodiment of the present invention, FIG. 5 is a graph showing the voltage Va at the negative input terminal of the operational amplifier 1, and FIG. 6 is a graph showing the voltage Va at the connection point between the diode 4 and the electrode 5. Graphs showing characteristics,
Figure 7 is a graph showing the relationship between temperature and insulation resistance.
FIG. 8 is a circuit diagram of a conventional example. Code explanation, 1, 11... operational amplifier, 2, 3,
12... Resistor, 4... Diode, 4'... Zener diode, 5... Electrode, 6... Oil,
8... Negative side electrode, 10... Thermistor.
Claims (1)
器と、電源と一方の電極との間に逆バイアス方向
に接続された半導体素子と、一方の入力端子が前
記電極に接続されかつ他方の入力端子が前記抵抗
器の接続点に接続されたオペアンプとを有し、他
方の電極と前記一方の電極との間の絶縁抵抗の変
化が前記オペアンプの出力変化として検出される
ことを特徴とするオイルレベルセンサー用検出回
路。 ２ 前記半導体素子がダイオードである実用新案
登録請求の範囲第１項に記載のオイルレベルセン
サー用検出回路。 ３ 前記半導体素子がツエナーダイオードである
実用新案登録請求の範囲第１項に記載のオイルレ
ベルセンサー用検出回路。 ４ 前記抵抗器の少なくとも一方がサーミスタと
抵抗器との組合せからなり、検出値が温度補正さ
れる実用新案登録請求の範囲第１項に記載のオイ
ルレベルセンサー用検出回路。[Claims for Utility Model Registration] 1. A resistor for dividing a power supply voltage to obtain a reference voltage, a semiconductor element connected in a reverse bias direction between the power supply and one electrode, and one input terminal connected to the an operational amplifier connected to the electrode and whose other input terminal is connected to the connection point of the resistor, and a change in insulation resistance between the other electrode and the one electrode is detected as a change in the output of the operational amplifier. A detection circuit for an oil level sensor, characterized in that: 2. The detection circuit for an oil level sensor according to claim 1, wherein the semiconductor element is a diode. 3. The detection circuit for an oil level sensor according to claim 1, wherein the semiconductor element is a Zener diode. 4. The detection circuit for an oil level sensor according to claim 1, wherein at least one of the resistors is a combination of a thermistor and a resistor, and the detected value is temperature-corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8212187U JPH0535290Y2 (en) | 1987-05-30 | 1987-05-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8212187U JPH0535290Y2 (en) | 1987-05-30 | 1987-05-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63193321U true JPS63193321U (en) | 1988-12-13 |
| JPH0535290Y2 JPH0535290Y2 (en) | 1993-09-08 |
Family
ID=30934484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8212187U Expired - Lifetime JPH0535290Y2 (en) | 1987-05-30 | 1987-05-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0535290Y2 (en) |
-
1987
- 1987-05-30 JP JP8212187U patent/JPH0535290Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0535290Y2 (en) | 1993-09-08 |
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