JPS5954856U - current detection circuit - Google Patents
current detection circuitInfo
- Publication number
- JPS5954856U JPS5954856U JP15112382U JP15112382U JPS5954856U JP S5954856 U JPS5954856 U JP S5954856U JP 15112382 U JP15112382 U JP 15112382U JP 15112382 U JP15112382 U JP 15112382U JP S5954856 U JPS5954856 U JP S5954856U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- current
- detection circuit
- emitter
- current detection
- 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
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図はシステムコンポーネント接続の電気機器システ
ムを説明する為の回路図、第２図ａ〜Ｃは交流平均値検
波方法の理想的な動作波形を示す信号波形図、第３図は
従来の電流検出回路の一例 〜を示す回路図、第４図ａ
、 ｂは第３図の回路の欠点を説明する為の信号波形
図、第５図は従来の電流検出回路の他の例を示す回路図
、第６図はこの考案に係る電流検出回路の一実施例を示
す回路図、−第７図ａ〜ｅは第６図の回路の動作を説明
する為の信号波形図である。
Ｔ・・・電流トランス、Ｑ２１〜Ｑ２８・・・トランジ
スタ、Ｄ２１．Ｄ２２・・・ダイオード、Ｃ２１・・・
コンデンサ、Ｒ２１・・・半固定抵抗、Ｒ２２〜Ｒ２４
・・・抵抗。
（ａ） （ｂ）
（Ｃ）−
■−ニー −１
１５
ｒ ｍFigure 1 is a circuit diagram for explaining an electrical equipment system with system component connections, Figures 2 a to C are signal waveform diagrams showing ideal operating waveforms for the AC average value detection method, and Figure 3 is a conventional current flow diagram. An example of a detection circuit: a circuit diagram showing ~, Figure 4a
, b is a signal waveform diagram for explaining the shortcomings of the circuit of FIG. 3, FIG. 5 is a circuit diagram showing another example of the conventional current detection circuit, and FIG. 6 is a diagram of one of the current detection circuits according to this invention. Circuit Diagrams Showing Embodiments - FIGS. 7a to 7e are signal waveform diagrams for explaining the operation of the circuit shown in FIG. 6. T...Current transformer, Q21-Q28...Transistor, D21. D22...diode, C21...
Capacitor, R21...Semi-fixed resistance, R22 to R24
···resistance. (a) (b) (C)- ■-Knee -1 15 r m
Claims (1)
ンに接続し前記電流変成器の２次巻線側に前記電源ライ
ンを流れる交流電流に相似な交流電流を得る手段と、エ
ミッタが共通接続され、この共通接続されたエミッタに
前記２次巻線側に得られた交流電流が供給されるＮＰＮ
トランジスタ及びＰＮＰトランジスタと、このＮＰＮ
トランジスタ及びＰＮＰ ）ランジスタの共通接続され
たエミッタの直流電位と各トランジスタのベースの直流
電位とを等しいレベルに設定するとともに各トランジス
タのエミッタの出力インピーダンスを高インピーダンス
に設定する手段と、前記ＮＰＮトランジスタのコレクタ
電流と前記ＰＮＰトランジスタのコレクタ電流を合成し
平滑する手段とを具備した電流検出回路。(i) A means for connecting the primary winding of a current transformer to a power line of a commercial AC power source and obtaining an alternating current similar to the alternating current flowing through the power line on the secondary winding side of the current transformer, and a common emitter; NPN connected to each other, and the alternating current obtained on the secondary winding side is supplied to this commonly connected emitter.
transistor and PNP transistor, and this NPN
Transistor and PNP) Means for setting the DC potential of the commonly connected emitters of the transistors and the DC potential of the base of each transistor to the same level, and setting the output impedance of the emitter of each transistor to high impedance; A current detection circuit comprising means for combining and smoothing a collector current and a collector current of the PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15112382U JPS5954856U (en) | 1982-10-05 | 1982-10-05 | current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15112382U JPS5954856U (en) | 1982-10-05 | 1982-10-05 | current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5954856U true JPS5954856U (en) | 1984-04-10 |
Family
ID=30334977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15112382U Pending JPS5954856U (en) | 1982-10-05 | 1982-10-05 | current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5954856U (en) |
-
1982
- 1982-10-05 JP JP15112382U patent/JPS5954856U/en active Pending
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