JPS5582314A - Contact anomaly detection circuit - Google Patents
Contact anomaly detection circuitInfo
- 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
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
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)
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 |
-
1978
- 1978-12-15 JP JP15603378A patent/JPS5582314A/en active Pending
Cited By (8)
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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