JPS6412481U

JPS6412481U -

Info

Publication number: JPS6412481U
Application number: JP1987106135U
Authority: JP
Priority date: 1987-07-10
Filing date: 1987-07-10
Publication date: 1989-01-23

Description

[Brief explanation of the drawing]

第１図は発明の一実施例の構成図、第２図は半
導体、冷却体、温度センサーの構成例を示す図、
第３図は本考案における温度センサー、温度検出
器の構成を示す図、第４図は電流に対する反限時
カーブを示す図、第５図は従来の一実施例の構成
図である。１０は電力変換器の１例であるインバータ回路
、２０は誘導電動機、３０は電流検出器、４０は
過負荷検出器、５０は遮断回路、６０は温度検出
器、８０は冷却体、９０は半導体素子、９５は温
度センサーである。なお、図中、同一符号は同一
又は相当部分を示す。 FIG. 1 is a configuration diagram of an embodiment of the invention, FIG. 2 is a diagram showing an example configuration of a semiconductor, a cooling body, and a temperature sensor.
FIG. 3 is a diagram showing the configuration of a temperature sensor and a temperature detector in the present invention, FIG. 4 is a diagram showing an inverse time curve for current, and FIG. 5 is a configuration diagram of a conventional embodiment. 10 is an inverter circuit which is an example of a power converter, 20 is an induction motor, 30 is a current detector, 40 is an overload detector, 50 is a cutoff circuit, 60 is a temperature detector, 80 is a cooling body, 90 is a semiconductor Element 95 is a temperature sensor. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

A current detector detects the load current in a power converter consisting of a cooling body and a power semiconductor, a temperature detector detects the temperature of the cooling body generated during power conversion, and a plurality of preset sensors that integrate the load currents. A power converter comprising an overload detector having an inverse time limit characteristic, and controlling power supplied to a load by selecting the inverse time limit characteristic of the overload detector corresponding to the output of the temperature detector. equipment overload protection device.