JPS5582314A - Contact anomaly detection circuit - Google Patents

Contact anomaly detection circuit

Info

Publication number
JPS5582314A
JPS5582314A JP15603378A JP15603378A JPS5582314A JP S5582314 A JPS5582314 A JP S5582314A JP 15603378 A JP15603378 A JP 15603378A JP 15603378 A JP15603378 A JP 15603378A JP S5582314 A JPS5582314 A JP S5582314A
Authority
JP
Japan
Prior art keywords
contact
temperature
resistance
heating unit
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP15603378A
Other languages
Japanese (ja)
Inventor
Hitoshi Fukagawa
Masayuki Naruo
Terumi Endo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP15603378A priority Critical patent/JPS5582314A/en
Publication of JPS5582314A publication Critical patent/JPS5582314A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Resistance Heating (AREA)
  • Control Of Temperature (AREA)

Abstract

PURPOSE: To detect immediately anomaly of a relay contact to break a power source and improve safety by operating AND between the signal voltage from a temperature control circuit using a face thermosensitive element and the voltage dependent upon a resistance connected in parallel to the contact relay.
CONSTITUTION: The temperature of face heating unit 1 is detected as the impedance of face thermosensitive element 2 having a temperature impedance characteristic such as nylon by signal detection circuit 12. Switching circuit 30 consisting of inverters 26 and 27 and resistance 20 is operated by this output, and transistor Tr17 is turned on and off to control relay coil 4, thereby switching relay contact 5. In case that contact 5 is welded by some cause, the temperature of heating unit 1 rises, and the output of inverter 26 becomes L-level. At this time, the output of inverter 28 becomes H-level to turn on Tr18 because no voltage is generated in resistance 22 connected in parallel to contact 5, and resistance 8 is heated to fuse temperature fuse 9, thereby stopping power supply to heating unit 1.
COPYRIGHT: (C)1980,JPO&Japio
JP15603378A 1978-12-15 1978-12-15 Contact anomaly detection circuit Pending JPS5582314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15603378A JPS5582314A (en) 1978-12-15 1978-12-15 Contact anomaly detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15603378A JPS5582314A (en) 1978-12-15 1978-12-15 Contact anomaly detection circuit

Publications (1)

Publication Number Publication Date
JPS5582314A true JPS5582314A (en) 1980-06-21

Family

ID=15618839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15603378A Pending JPS5582314A (en) 1978-12-15 1978-12-15 Contact anomaly detection circuit

Country Status (1)

Country Link
JP (1) JPS5582314A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776779A (en) * 1980-10-29 1982-05-13 Matsushita Electric Ind Co Ltd Power controller for electric cooking device
JPS61170852U (en) * 1985-04-08 1986-10-23
JPS61177641U (en) * 1985-04-25 1986-11-06
JPH01315811A (en) * 1988-06-15 1989-12-20 Toshiba Electric Appliance Co Ltd Contact abnormality detector
WO1999027306A1 (en) * 1997-11-25 1999-06-03 Matsushita Electric Industrial Co., Ltd. Electric cooker

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776779A (en) * 1980-10-29 1982-05-13 Matsushita Electric Ind Co Ltd Power controller for electric cooking device
JPH0219595B2 (en) * 1980-10-29 1990-05-02 Matsushita Electric Ind Co Ltd
JPS61170852U (en) * 1985-04-08 1986-10-23
JPS61177641U (en) * 1985-04-25 1986-11-06
JPH0315075Y2 (en) * 1985-04-25 1991-04-03
JPH01315811A (en) * 1988-06-15 1989-12-20 Toshiba Electric Appliance Co Ltd Contact abnormality detector
WO1999027306A1 (en) * 1997-11-25 1999-06-03 Matsushita Electric Industrial Co., Ltd. Electric cooker
US6137091A (en) * 1997-11-25 2000-10-24 Matsushita Electric Industrial Co., Ltd. Electric cooker

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