JPH0250687U - - Google Patents
Info
- Publication number
- JPH0250687U JPH0250687U JP13025288U JP13025288U JPH0250687U JP H0250687 U JPH0250687 U JP H0250687U JP 13025288 U JP13025288 U JP 13025288U JP 13025288 U JP13025288 U JP 13025288U JP H0250687 U JPH0250687 U JP H0250687U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- charging
- capacitance
- measured capacitance
- discharging 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
- 238000007599 discharging Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Description
第１図は本考案の第１の実施例の構成を示す回
路図、第２図は本考案の第２の実施例の構成を示
す回路図、第３図は従来の第１の容量測定回路の
構成を示す回路図、第４図は従来の第２の容量測
定回路の構成を示す回路図である。
Ｑ１…演算増幅器、ＨＹＳ…ヒステリシス回路
、ＰＷＭ…パルス幅測定回路、ＣＭ…測定容量、
ＶＤ…電源電圧。
FIG. 1 is a circuit diagram showing the configuration of a first embodiment of the present invention, FIG. 2 is a circuit diagram showing the configuration of a second embodiment of the present invention, and FIG. 3 is a conventional first capacitance measuring circuit. FIG. 4 is a circuit diagram showing the structure of a conventional second capacitance measuring circuit. Q1 ...Operation amplifier, HYS...Hysteresis circuit, PWM...Pulse width measurement circuit, CM...Measurement capacitance,
VD...Power supply voltage.
Claims (1)
充放電回路によりこの測定容量に対応するパルス
幅信号に変換する容量測定回路において、前記充
放電回路の出力とは逆相で前記充放電回路の入力
端に帰還する帰還回路を具備することを特徴とす
る容量測定回路。 In a capacitance measuring circuit that converts the measured capacitance into a pulse width signal corresponding to the measured capacitance by a charging/discharging circuit that charges and discharges the measured capacitance with a current determined by a resistor, the input terminal of the charging/discharging circuit is in opposite phase to the output of the charging/discharging circuit. A capacitance measuring circuit characterized by comprising a feedback circuit that feeds back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13025288U JPH0250687U (en) | 1988-10-04 | 1988-10-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13025288U JPH0250687U (en) | 1988-10-04 | 1988-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0250687U true JPH0250687U (en) | 1990-04-09 |
Family
ID=31385251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13025288U Pending JPH0250687U (en) | 1988-10-04 | 1988-10-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0250687U (en) |
-
1988
- 1988-10-04 JP JP13025288U patent/JPH0250687U/ja active Pending