JPS63157672U - - Google Patents
Info
- Publication number
- JPS63157672U JPS63157672U JP5055087U JP5055087U JPS63157672U JP S63157672 U JPS63157672 U JP S63157672U JP 5055087 U JP5055087 U JP 5055087U JP 5055087 U JP5055087 U JP 5055087U JP S63157672 U JPS63157672 U JP S63157672U
- Authority
- JP
- Japan
- Prior art keywords
- oscillation
- capacitance
- circuit
- voltage
- oscillation 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
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Thermally Insulated Containers For Foods (AREA)
Description
第１図は本考案に係る静電容量―電圧変換回路
の一実施例を示す回路図、第２図は静電容量式液
量センサーの断面図、第３図は第１図の回路図に
おける電圧波形を示す図、第４図は静電容量と出
力電圧との関係を示す特性図、第５図は第１図の
静電容量―電圧変換回路の温度特性を示す図、第
６図及び第７図はそれぞれ本考案の他の実施例を
示す回路図である。
１：第１発振回路、２：第２発振回路、３：フ
イルター回路、ＩＣ１〜ＩＣ５：インバータ、Ｒ
１，Ｒ２：抵抗、Ｃｘ，Ｃｓ，Ｃ：コンデンサ。
Fig. 1 is a circuit diagram showing an embodiment of the capacitance-voltage conversion circuit according to the present invention, Fig. 2 is a sectional view of a capacitance type liquid level sensor, and Fig. 3 is a circuit diagram showing an example of the capacitance-voltage conversion circuit according to the present invention. Figure 4 is a diagram showing the voltage waveform, Figure 4 is a characteristic diagram showing the relationship between capacitance and output voltage, Figure 5 is a diagram showing the temperature characteristics of the capacitance-voltage conversion circuit in Figure 1, Figure 6 and FIG. 7 is a circuit diagram showing other embodiments of the present invention. 1: First oscillation circuit, 2: Second oscillation circuit, 3: Filter circuit, IC1 to IC5 : Inverter, R
1 , R2 : Resistor, Cx, Cs, C: Capacitor.
Claims (1)
振回路と、静電容量によつて発振周波数を設定さ
れる第２発振回路、両発振回路を結合するダイオ
ードと、第２発振回路の出力電圧を直流電圧に変
換するフイルター回路とからなる静電容量―電圧
変換回路。 (2) 前記第２発振回路が、その発振周波数を静
電容量の変化する素子により設定される実用新案
登録請求の範囲第１項記載の静電容量―電圧変換
回路。[Claims for Utility Model Registration] (1) A first oscillation circuit that outputs a pulse voltage of a constant frequency, a second oscillation circuit whose oscillation frequency is set by capacitance, and a diode that couples both oscillation circuits. , a capacitance-voltage conversion circuit consisting of a filter circuit that converts the output voltage of the second oscillation circuit into a DC voltage. (2) The capacitance-voltage conversion circuit according to claim 1, wherein the second oscillation circuit has an oscillation frequency set by an element whose capacitance changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5055087U JPS63157672U (en) | 1987-04-02 | 1987-04-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5055087U JPS63157672U (en) | 1987-04-02 | 1987-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63157672U true JPS63157672U (en) | 1988-10-17 |
Family
ID=30874017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5055087U Pending JPS63157672U (en) | 1987-04-02 | 1987-04-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63157672U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5842764B2 (en) * | 1977-08-27 | 1983-09-21 | 住友金属工業株式会社 | Inter-stand tension control method for continuous rolling mill for section steel |
-
1987
- 1987-04-02 JP JP5055087U patent/JPS63157672U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5842764B2 (en) * | 1977-08-27 | 1983-09-21 | 住友金属工業株式会社 | Inter-stand tension control method for continuous rolling mill for section steel |
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