JPS578801A - Temperature controller - Google Patents
Temperature controllerInfo
- Publication number
- JPS578801A JPS578801A JP8280780A JP8280780A JPS578801A JP S578801 A JPS578801 A JP S578801A JP 8280780 A JP8280780 A JP 8280780A JP 8280780 A JP8280780 A JP 8280780A JP S578801 A JPS578801 A JP S578801A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistance
- comparator
- reference voltage
- resistances
- 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
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
- G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
- Control Of Temperature (AREA)
Abstract
PURPOSE:To decrease the number of parts and to improve reliability by providing a switching means, turned on and off by an external signal, in parallel to part of a resistance constituting a voltage dividing circuit which obtains a reference voltage. CONSTITUTION:A thermistor TH1 as a temperature detector is connected in series to resistances R1 and R2 and a variable resistance VR1 and a power voltage Vcc is divided to supply a voltage Vv, which corresponds to a detected temperature, to the noninverted input terminal of a comparator 1. A voltage Vs obtained by dividing the power voltage Vcc by a voltage dividing circuit consisting of resistances R7-R9 is applied to the inverted input terminal of the comparator 1 as the reference voltage and then compared with a voltage Vv. The collector and emitter of a transistor TR1 are connected to both terminals of the resistance R7 and an extermal switching signal is applied to the base of a TR1, which then turns on and off. When the switching signal is at a low potential, the TR1 turns on to short-circuit the resistance R7, so that a reference voltage Vs-c is higher than a reference voltage Vs-d when the TR1 is off. Therefore, the temperature detection voltage is compared by one comparator with more than one reference voltages, the number of parts is small, and the reliability is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8280780A JPS578801A (en) | 1980-06-20 | 1980-06-20 | Temperature controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8280780A JPS578801A (en) | 1980-06-20 | 1980-06-20 | Temperature controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS578801A true JPS578801A (en) | 1982-01-18 |
Family
ID=13784674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8280780A Pending JPS578801A (en) | 1980-06-20 | 1980-06-20 | Temperature controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS578801A (en) |
-
1980
- 1980-06-20 JP JP8280780A patent/JPS578801A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS578801A (en) | Temperature controller | |
JPS5797230A (en) | Magnetic sensor switch device | |
JPS5587941A (en) | Humidity sensor | |
JPS568913A (en) | Signal clamping circuit | |
JPS56159716A (en) | Direct-current electric power device | |
JPS5320554A (en) | Constant current circuit | |
JPS5672524A (en) | Comparator circuit | |
SU122558A1 (en) | Electric heater | |
JPS55119066A (en) | Measuring device for contact resistance | |
JPS5473254A (en) | Constant-voltage circuit | |
JPS56168243A (en) | Constant-voltage circuit | |
RU1774277C (en) | Voltage metering device | |
JPS5539456A (en) | Pulse generation circuit | |
JPS56132026A (en) | Contactless switch | |
JPS57170628A (en) | Transistor circuit | |
JPS5616311A (en) | Transistor circuit | |
GB1516002A (en) | Monolithically integrated threshold switch | |
JPS5248397A (en) | Detecting device of heat conduction type | |
JPS5350567A (en) | Control circuit for dryer | |
JPS55163423A (en) | Temperature detecting circuit | |
JPS5755426A (en) | Direct current power supply circuit | |
JPS57101914A (en) | Electric power supplying circuit | |
JPS5635528A (en) | Pulse driving circuit | |
JPS5414642A (en) | Fused rom | |
JPS5634231A (en) | Logical operation circuit |