JPS5989269U

JPS5989269U - current detection circuit

Info

Publication number: JPS5989269U
Application number: JP18435982U
Authority: JP
Inventors: 俊幸山下
Original assignee: 富士電機株式会社
Priority date: 1982-12-07
Filing date: 1982-12-07
Publication date: 1984-06-16

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

[Brief explanation of the drawing]

第１図は従来の電流検出回路を示すブロック結線図、第
２図は本考案に係る電流検出回路の一実施例を示す回路
図である。Ｒ２，Ｒ３・・・電圧源、Ｊ２・・・電流源、Ｒｏ・・
・検出抵抗、Ｒ１・・・負荷抵抗、Ｒ６・・・抵抗、Ｏ
Ａ・・・演算増幅器、Ｔｒ□、　Ｔｆ２．　Ｔｆ３・・
・トランジスタ、Ｔｆ・・・トランス、Ｄｌ、　Ｄ２・
・・ダイオード、ＲＡ・・・整流用抵抗、Ｃ・・・平滑
用コンデンサ。FIG. 1 is a block diagram showing a conventional current detection circuit, and FIG. 2 is a circuit diagram showing an embodiment of the current detection circuit according to the present invention. R2, R3... Voltage source, J2... Current source, Ro...
・Detection resistance, R1...Load resistance, R6...Resistance, O
A... operational amplifier, Tr□, Tf2. Tf3...
・Transistor, Tf...transistor, Dl, D2・
...Diode, RA...rectifier resistance, C...smoothing capacitor.

Claims

[Scope of utility model registration request]

(1) In a current detection circuit configured to configure a closed loop circuit by connecting a detection resistor and a load resistor to detect a current from a constant current source, and to output a terminal voltage of the detection resistor via an operational amplifier. , passing a current that does not cancel the current flowing through the detection resistor, supplying AC power to the primary side of the transformer with this current, and rectifying the AC power on the secondary side of the transformer to reduce the current flowing through the detection resistor. A current detection circuit characterized by providing a circuit that obtains a proportional voltage output.

(2) Utility Model Registration Scope of Claim In the current detection circuit according to claim 1, the circuit that obtains a voltage output proportional to the current flowing through the detection resistor includes a transistor that performs current control based on the output of an operational amplifier; A current detection circuit consisting of a voltage source and a transistor forming a chopper connected to the primary side of a transformer.

(3) Utility model registration Claims In the current detection circuit described in claim 1 or 2, a rectifier circuit consisting of a diode or Zener diode, a resistor, and a smoothing capacitor is installed on the secondary side of the transformer using a center tap method. A current detection circuit that is connected.