JPS5872997U

JPS5872997U - Inverter input/output overcurrent separation detection device

Info

Publication number: JPS5872997U
Application number: JP16694081U
Authority: JP
Inventors: 上符　敏昭; 内海　廣明; 哲夫山田
Original assignee: 株式会社明電舎
Priority date: 1981-11-09
Filing date: 1981-11-09
Publication date: 1983-05-17

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図および第２図は本考案に係るインバータの入出力
の過電流分離検出装置の一実施例を示す回路図であって
、図中Ｒｅｆ□は順変換器、Ｃ工はコンデンサ、ＣＴ１
は整流器、ＴＲＵ〜ＴＲＺはトランジスタ、ＤＵ〜ＤＺ
はダイオード、ＩＮはインバータ、ＣＴ（ＣＴｕ、　Ｃ
Ｔｗ）は変流器、ＡＭは交流電動機、Ｒｆｏは整流器、
ＣＰ□は第１のコンパレータ、ＣＦ２は第２のコンパレ
ータ、ＯＲはオア回路、ＡＮＤ□。ＡＮＤ２はアンド回路、ＮＯＴ□はノット回路、Ｍ１〜
Ｍ３はメモリを示す。1 and 2 are circuit diagrams showing an embodiment of an overcurrent separation and detection device for input and output of an inverter according to the present invention, in which Ref□ is a forward converter, C is a capacitor, and CT1
is a rectifier, TRU~TRZ are transistors, DU~DZ
is a diode, IN is an inverter, CT (CTu, C
Tw) is a current transformer, AM is an AC motor, Rfo is a rectifier,
CP□ is the first comparator, CF2 is the second comparator, OR is the OR circuit, AND□. AND2 is an AND circuit, NOT□ is a NOT circuit, M1~
M3 indicates memory.

Claims

[Scope of utility model registration request]

A device for operating an AC motor at variable speed with an inverter, comprising a first current detector provided on the input side of the inverter, a second current detector provided on the output side of the inverter, and the first current detector provided on the input side of the inverter. a first comparator that inputs the detection output of the detector, compares it with a predetermined setting level, and outputs the output when it exceeds the set level; a rectifier that rectifies the output of the second current detector; and an output of the rectifier. a second comparator which receives the input signal, compares it with a predetermined set level, and outputs the output when it exceeds the set level; and a first AND circuit which takes the AND of each output of the sixth comparator and the second comparator. , and a second AND circuit to which the output of the first AND circuit is inverted and supplied, and the output of the first comparator is supplied, and the output of the inverter is determined by the established output of the first AND circuit. An overcurrent separation and detection device for input and output of an inverter, characterized in that an output overcurrent is displayed, and a DC overcurrent is displayed based on the established output of the second AND circuit.