JPS6244632U

JPS6244632U -

Info

Publication number: JPS6244632U
Application number: JP13779785U
Authority: JP
Priority date: 1985-09-09
Filing date: 1985-09-09
Publication date: 1987-03-18

Description

[Brief explanation of the drawing]

第１図は本考案の第１の実施例を示す結線図、
第２図は同第１の実施例中の各部波形図、第３図
は本考案の第２の実施例を示す結線図、第４図は
従来例を示す結線図、第５図は同従来例における
動作特性図である。図中、２はモータ（負荷）、５は主回路、７は
増幅回路（引き外し回路）、８，９，１０は変流
器、１１は整流回路、１６は変換回路、１７，１
８_１〜１８ｎ，２９は抵抗（インピーダンス素子
）、１９_１〜１９ｎはトランジスタ、２０，３０
は積分回路、２１，２８は信号処理回路、２２，
２３，２４は補助変流器、２５は補助整流回路、
２６はピーク値検出回路、２７は制御回路、３２
_１〜３２ｎはコンデンサを示す。 FIG. 1 is a wiring diagram showing the first embodiment of the present invention;
Fig. 2 is a waveform diagram of each part in the first embodiment, Fig. 3 is a wiring diagram showing the second embodiment of the present invention, Fig. 4 is a wiring diagram showing the conventional example, and Fig. 5 is the same conventional example. FIG. 6 is an operational characteristic diagram in an example. In the figure, 2 is the motor (load), 5 is the main circuit, 7 is the amplifier circuit (tripping circuit), 8, 9, 10 are current transformers, 11 is the rectifier circuit, 16 is the conversion circuit, 17, 1
8 ₁ to 18n, 29 are resistors (impedance elements), 19 ₁ to 19n are transistors, 20, 30
is an integration circuit, 21 and 28 are signal processing circuits, 22,
23 and 24 are auxiliary current transformers, 25 is an auxiliary rectifier circuit,
26 is a peak value detection circuit, 27 is a control circuit, 32
₁ to 32n indicate capacitors.

Claims

[Scope of utility model registration request]

It has a rectifier circuit that rectifies the secondary output of a current transformer installed to detect the main circuit current, an impedance element that converts the output of the rectifier circuit into a voltage signal, and an integration circuit that integrates the voltage signal. and a signal processing circuit configured such that the impedance of the impedance element or the time constant of the integrating circuit can be changed, and a main circuit contact is opened when the output voltage from the signal processing circuit exceeds a predetermined reference voltage. A trip circuit, an auxiliary rectifier circuit that rectifies the secondary output of an auxiliary current transformer provided to detect the main circuit current, and a peak value detection circuit that detects the peak value of the output from this auxiliary rectifier circuit. and a control circuit that changes the impedance of the conversion circuit or the time constant of the integration circuit in accordance with the detection result of the peak value detection circuit.