JPS5826191U

JPS5826191U - Heating element temperature control circuit

Info

Publication number: JPS5826191U
Application number: JP12174681U
Authority: JP
Inventors: 遠藤　輝巳; 博真鍋; 多和　大介
Original assignee: 松下電工株式会社
Priority date: 1981-08-14
Filing date: 1981-08-14
Publication date: 1983-02-19
Also published as: JPS6333516Y2

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 drawings]

第１図は面状発熱体の断面図、第２図は従来例の回路図
、第３図はこの考案の一実施例を示す回路図である。１・・・・・・発熱素子、２・・・・・・感熱素子、３
・・・・・・信号検出段、４・・・・・・エミッタホロ
ア段（バッファ回路）、６・・・・・・第１保護回路段
、７・・・・・・第２保護回路段、８・・・・・・ヒー
タ、９・・・・・・モニタ回路、ＴＲ・・・・・・ｉｌ
［）ランス、Ｃ１，Ｃ２，Ｃ３・・・・・・コンデンサ
、Ｒ−−−−−−発熱抵抗、Ｒ，、Ｒ，、Ｒ，、Ｒ，、
Ｒ，、Ｒ，、。Ｒｋ、　Ｒｍ、　Ｒ，、Ｒｅ、　Ｒ，、Ｒ，、Ｒ，Ｒ，
−−−−−−抵抗、Ｄｌ、　Ｄ２．　Ｄ３・・・・・・
ダイオード、ＳＷ・・・・・・スイッチング回路、ＲＹ
、、　ＲＹ２・・・・・・リレー１、Ｓ４．Ｓ２．Ｓ３
・・・リレー接点、Ｓ’ｂ−Ｓ４’　＋　Ｓ５＋　Ｓ５
’・・・・・・ヒータ切替スイッチ、ＴＦ・・・・・・
温度ヒユーズＮ　Ｑｌｌ　Ｑ２１　Ｑ３１Ｑ、、　Ｑ、
・・・・・・トランジスタ。FIG. 1 is a sectional view of a planar heating element, FIG. 2 is a circuit diagram of a conventional example, and FIG. 3 is a circuit diagram showing an embodiment of this invention. 1... Heat generating element, 2... Heat sensitive element, 3
... Signal detection stage, 4 ... Emitter follower stage (buffer circuit), 6 ... First protection circuit stage, 7 ... Second protection circuit stage, 8...Heater, 9...Monitor circuit, TR...il
[) Lance, C1, C2, C3...Capacitor, R--Heating resistance, R,, R,, R,, R,,
R,,R,,. Rk, Rm, R,, Re, R,, R,, R, R,
--------Resistance, Dl, D2. D3...
Diode, SW...Switching circuit, RY
,, RY2...Relay 1, S4. S2. S3
...Relay contact, S'b-S4' + S5+ S5
'・・・Heater changeover switch, TF...
Temperature fuse N Qll Q21 Q31Q,, Q,
...Transistor.

Claims

[Scope of utility model registration request]

a signal detection circuit that generates an output voltage corresponding to the temperature of a heating element; a buffer circuit provided on the output side of the signal detection circuit and having an input impedance sufficiently larger than an output impedance of the signal detection circuit; and an output of the buffer circuit. a smoothing capacitor that is connected between both ends of the smoothing capacitor and receives an output voltage of the smoothing capacitor that corresponds to the output voltage of the signal detection circuit, and turns on/off the power supply to the heating element. a switching circuit to control, and a switching circuit connected in parallel with the switching circuit between both ends of the smoothing capacitor to detect an output voltage of the smoothing capacitor corresponding to an abnormal temperature rise of the heating element and supplying power to the heating element. a first protection circuit for urgently stopping the first protection circuit; a second protection circuit that forcibly operates the first protection circuit; and a second protection circuit that is provided in parallel with the buffer circuit on the output side of the signal detection circuit and that corresponds to an abnormal temperature rise of the heating element when the buffer circuit fails. A temperature control circuit for a heating element, comprising a monitor circuit that detects an output voltage and forcibly operates the first protection circuit.