JPS58112941U

JPS58112941U - Disconnection detection circuit in temperature detection circuit

Info

Publication number: JPS58112941U
Application number: JP18527482U
Authority: JP
Inventors: 健宮城
Original assignee: 東北金属工業株式会社
Priority date: 1982-12-09
Filing date: 1982-12-09
Publication date: 1983-08-02
Also published as: JPS5914741Y2

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) [Abstract] 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のブロックダイヤグラム、第
２図は温度検出回路の出力特性を示すグラフ、第３図は
、第１図の実施例の各部の様子を゛　示す波形図、第４
図は、本考案の他の実施例を示す図、第５図は第４図の
実施例を説明するに当って、各部の様子を示す波形図を
、それぞれ示す。図に於て主な参照符号は次のとおりである。１゜１１・
・・・・・交流発振器、２，４・・・・・・高入力イン
ピーダンス交流増幅器、３，５・・・・・・整流回路、
ｉ・・・・・・温度センサー、ｂ、Ｒｏ・・・・・・制
御抵抗、Ｃ，Ｚｏ・・・・・・レベルシフトダイオード
、Ｋ、　Ｍ・・・・・・トランジスタ増幅器、Ｌ、　Ｎ
・・・・・・整流回路。Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a graph showing the output characteristics of the temperature detection circuit, Fig. 3 is a waveform diagram showing the state of each part of the embodiment of Fig. 4
The figure shows another embodiment of the present invention, and FIG. 5 shows a waveform diagram showing the state of each part in explaining the embodiment of FIG. 4. The main reference symbols in the figure are as follows. 1゜11・
...AC oscillator, 2,4...High input impedance AC amplifier, 3,5... Rectifier circuit,
i...Temperature sensor, b, Ro...Control resistor, C, Zo...Level shift diode, K, M...Transistor amplifier, L, N
・・・・・・Rectifier circuit.

Claims

[Scope of utility model registration request]

(1) An inductor wound with a temperature-sensitive magnetic material having a predetermined Curie point temperature is driven by an AC oscillator, the terminal output voltage of the inductor is taken out via a first high input impedance AC amplifier, and the In a temperature detection circuit configured to detect temperature depending on the presence or absence of an output from a first amplifier, a second high input impedance amplifier is connected in parallel with the first amplifier via a level shift diode, and the inductor is connected to the AC oscillator. A difference is created in the voltage generated at the input of the first high input impedance AC amplifier between when the inductor is connected and when it is not connected, and the level setting point of the level shift diode is set only when the inductor is not connected. A disconnection detection circuit configured to provide an input to the second amplifier, thereby detecting the presence or absence of a disconnection in the inductor and its connection line based on the presence or absence of an output from the second amplifier.

(2) An inductor wound with a temperature-sensitive magnetic material having a predetermined Curie point temperature is driven by an AC oscillator, and the terminal output AC voltage of the inductor is extracted by amplifying only the half-wave part using the first transistor. , in a temperature detection circuit configured to detect temperature depending on the presence or absence of an output of the first transistor, a second transistor of a conductivity type opposite to that of the first transistor is connected in parallel with the first transistor circuit;
transistors are connected through a level shift diode, and what is the amplified half-wave of the input voltage to the first transistor when the inductor is connected to the AC oscillator and when it is not connected? The level of the level shift diode is set so that there is a difference between the half-wave part input voltages of opposite polarity, and the input is given to the second transistor only when the inductor is not connected. A disconnection detection circuit that detects the presence or absence of a disconnection in the inductor and its connection line based on the presence or absence of the output of the second transistor.