JPS5467874A - Temperature control circuit - Google Patents
Temperature control circuitInfo
- Publication number
- JPS5467874A JPS5467874A JP13591377A JP13591377A JPS5467874A JP S5467874 A JPS5467874 A JP S5467874A JP 13591377 A JP13591377 A JP 13591377A JP 13591377 A JP13591377 A JP 13591377A JP S5467874 A JPS5467874 A JP S5467874A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- thyristor
- transistor
- case
- ripple voltage
- 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 lessen overrun in the case of the temp rise of a heater, by generating gate pulse when ripple voltage in case of ON-OFF becomes zero, in a device that forms gate pulse to a semiconductor element for controlling the current of the heater by the ON-OFF signal of a switching circuit.
CONSTITUTION: A two-way 3 terminal thysistor 2 is connected to a heater 1, a transistor 5 is in ON-OFF by the signals of a temp detecting circuit 3 and transmits signals to a drive circuit 4, and the gate pulse VG of the thyristor 2 is generated from the drive circuit. Since ripple voltage appears in a collector of the transistor when the transistor 5 is in ON-OFF, and pulse for driving the thyristor is generated when the ripple voltage becomes zero, the conduction of the thyristor 2 is changed into the semi-cycle of a power source and current flowing through the heater 1 is also converted into the semi-cycle of the power source, thus lessening overrun in the case of the temp rise of the heater.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13591377A JPS5467874A (en) | 1977-11-11 | 1977-11-11 | Temperature control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13591377A JPS5467874A (en) | 1977-11-11 | 1977-11-11 | Temperature control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5467874A true JPS5467874A (en) | 1979-05-31 |
Family
ID=15162758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13591377A Pending JPS5467874A (en) | 1977-11-11 | 1977-11-11 | Temperature control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5467874A (en) |
-
1977
- 1977-11-11 JP JP13591377A patent/JPS5467874A/en active Pending
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