JPH02128965U - - Google Patents
Info
- Publication number
- JPH02128965U JPH02128965U JP3764089U JP3764089U JPH02128965U JP H02128965 U JPH02128965 U JP H02128965U JP 3764089 U JP3764089 U JP 3764089U JP 3764089 U JP3764089 U JP 3764089U JP H02128965 U JPH02128965 U JP H02128965U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- input
- circuit
- amplifier
- pulse width
- 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
- 238000009499 grossing Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Amplifiers (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
第１図及び第２図は夫々本考案に係る装置の実
施例の接続図、第３図及び第５図は夫々従来装置
の接続図、第４図は動作を説明する為の波形図で
ある。
ＣＴ……変流器、ＰＷＭ……パルス幅変調回路
、Ｒ，２Ｒ……入力抵抗器、Ｓ１……スイツチン
グ素子、ＡＦ……平滑増幅器。
1 and 2 are connection diagrams of an embodiment of the device according to the present invention, FIGS. 3 and 5 are connection diagrams of a conventional device, respectively, and FIG. 4 is a waveform diagram for explaining the operation. . CT... Current transformer, PWM... Pulse width modulation circuit, R, 2R... Input resistor, S1... Switching element, AF... Smoothing amplifier.
Claims (1)
調回路、電流入力が供給される変流器の２次巻線
に並列に接続されその中点が基準電位点に接続さ
れた抵抗器、演算増幅器の帰還回路に抵抗及びコ
ンデンサを有すると共に入力抵抗に第１の抵抗器
Ｒとこの第１の抵抗器の抵抗値の２倍の抵抗値を
持つ第２の抵抗器で構成された平滑増幅器、及び
スイツチング素子を具備し、前記変流器の２次巻
線の一端を第１の抵抗器Ｒとスイツチング素子の
直列回路を介して平滑増幅器の加算入力点に接続
すると共に、変流器の２次巻線の他端を第２の抵
抗器２Ｒを介して平滑増幅器の前記加算入力点に
接続するように構成した電力測定装置。 A pulse width modulation circuit that modulates a voltage input into a pulse width signal, a resistor connected in parallel to the secondary winding of the current transformer to which the current input is supplied and whose midpoint is connected to a reference potential point, and an operational amplifier. A smoothing amplifier which has a resistor and a capacitor in a feedback circuit, and which is composed of a first resistor R and a second resistor having a resistance value twice the resistance value of the first resistor as an input resistor, and a switching circuit. one end of the secondary winding of the current transformer is connected to the summing input point of the smoothing amplifier through a series circuit of the first resistor R and the switching element; A power measuring device configured such that the other end of the line is connected to the addition input point of the smoothing amplifier via a second resistor 2R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3764089U JPH0629748Y2 (en) | 1989-03-31 | 1989-03-31 | Power measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3764089U JPH0629748Y2 (en) | 1989-03-31 | 1989-03-31 | Power measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02128965U true JPH02128965U (en) | 1990-10-24 |
| JPH0629748Y2 JPH0629748Y2 (en) | 1994-08-10 |
Family
ID=31544936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3764089U Expired - Fee Related JPH0629748Y2 (en) | 1989-03-31 | 1989-03-31 | Power measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0629748Y2 (en) |
-
1989
- 1989-03-31 JP JP3764089U patent/JPH0629748Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0629748Y2 (en) | 1994-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |