JPS6088622U

JPS6088622U - Load impedance detection circuit

Info

Publication number: JPS6088622U
Application number: JP18060783U
Authority: JP
Inventors: 古川　伸夫
Original assignee: フオスタ−電機株式会社
Priority date: 1983-11-22
Filing date: 1983-11-22
Publication date: 1985-06-18

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図は本考案の一実施例を示す回路図、第２図は本考
案による一実施例の整流波形図、第３図は従来の回路例
を示す回路図、第４図は従来の検出電圧波形の位相図。Ａ１・・・電力増幅器、Ａ２．　Ａ３・・・電圧増幅器
、団・・・負荷、Ｄ１〜Ｄ３・・・整流器、Ｒ１へＲ１
１・・・抵抗、Ｃ１，Ｃ２・・・コンデンサー、ＣＰ・
・・電圧比較器、β・・・電源電圧、Ｉｓ・・・負荷電
流、■。Ｖｓ、　Ｖｐ、　Ｖｄｓ、　Ｖｄｐ、　Ｖｃ−−−各ポ
イントの電圧。Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a rectification waveform diagram of an embodiment of the invention, Fig. 3 is a circuit diagram showing a conventional circuit example, and Fig. 4 is a conventional detection method. Phase diagram of voltage waveform. A1...power amplifier, A2. A3...voltage amplifier, group...load, D1-D3...rectifier, R1 to R1
1...Resistor, C1, C2...Capacitor, CP・
...Voltage comparator, β...Power supply voltage, Is...Load current, ■. Vs, Vp, Vds, Vdp, Vc---Voltage at each point.

Claims

[Scope of utility model registration request]

A first circuit detects a load current flowing through a load connected to a power amplifier output stage by replacing it with a voltage, and inputs a DC voltage Vds obtained by rectifying this detected voltage to a voltage comparator to which a constant bias voltage Vc is applied. , a second circuit that divides the load voltage applied to the load and inputs a DC voltage Vdp obtained by rectifying the detected voltage to another input terminal of the voltage comparator, and a bias applied to the voltage comparator. Voltage Vc
, a load impedance detection circuit that compares a load impedance with a set value from input voltages Vd5i and Vdp.