GB1382047A - Thermal storage heaters - Google Patents
Thermal storage heatersInfo
- Publication number
- GB1382047A GB1382047A GB3074671A GB3074671A GB1382047A GB 1382047 A GB1382047 A GB 1382047A GB 3074671 A GB3074671 A GB 3074671A GB 3074671 A GB3074671 A GB 3074671A GB 1382047 A GB1382047 A GB 1382047A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- thermistor
- temperature
- scr
- value
- 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.)
- Expired
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
-
- 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
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
- G05D23/1923—Control of temperature characterised by the use of electric means characterised by the type of controller using thermal energy, the cost of which varies in function of time
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
1382047 Thermal storage heaters BRITISH DOMESTIC APPLIANCES Ltd 28 June 1972 [30 June 1971] 30746/71 Heading F4U [Also in Divisions H2 and G3] The temperature of a room is maintained at a desired value by an electric storage heater the output of which, is adjusted by adjusting the speed of a fan motor (e.g. a shaded pole induction motor) 14 (Figs. 1 and 2) thereof in dependence upon the temperature of air flow at the air inlet 15 of the heater and sensed by a sensor 17, e.g. an N.T.C. thermistor. The motor speed is controlled by a circuit Fig. 2, which changes the RMS value of the motor input voltage by varying the firing angle of an S.C. Rectifier Th in a diode switching bridge 21, in dependence upon the resistance of thermistor 17. The desired temperature may be pre-set on a resistor RV1. If the sensed temperature exceeds a predetermined value the SCR will not receive firing pulses and the fan will be stopped, only a minimal control circuit current flowing in the motor. In operation, a capacitor C1 is charged initially at a high rate via R4, D1, to a certain value, and then at a lower rate via R3. A ramp and pedestal waveform is thereby produced at the emitter of a transistor TR1. The base voltage of TR1 is dependent upon the resistance of sensor 17. When the potential at its emitter sufficiently exceeds that of its base, TR1 conducts, turning on TR2 which in turn renders TR1 more conductive and the pair saturate rapidly. C1 then discharges via TR1 and TR2 to turn ON the SCR. The control circuit power supply now collapses and the process is repeated in the next half cycle of the supply. If the motor is highly inductive it may be shunted by a resistor and capacitor, unit A so as to ensure that the SCR current exceeds its holding current value throughout the supply voltage half cycle when it is required to conduct. R7 is for linearizing thermistor 17.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3074671A GB1382047A (en) | 1971-06-30 | 1971-06-30 | Thermal storage heaters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3074671A GB1382047A (en) | 1971-06-30 | 1971-06-30 | Thermal storage heaters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1382047A true GB1382047A (en) | 1975-01-29 |
Family
ID=10312491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3074671A Expired GB1382047A (en) | 1971-06-30 | 1971-06-30 | Thermal storage heaters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1382047A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2236877A (en) * | 1989-08-03 | 1991-04-17 | I O Innovation Design Consulta | Fan-controlled PTC heating apparatus |
CN102720684A (en) * | 2012-07-15 | 2012-10-10 | 何林 | Speed governing exhaust fan controller |
-
1971
- 1971-06-30 GB GB3074671A patent/GB1382047A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2236877A (en) * | 1989-08-03 | 1991-04-17 | I O Innovation Design Consulta | Fan-controlled PTC heating apparatus |
CN102720684A (en) * | 2012-07-15 | 2012-10-10 | 何林 | Speed governing exhaust fan controller |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3887781A (en) | Metal base cookware induction heating apparatus having improved control circuit using infra-red temperature sensor | |
US3215818A (en) | Temperature control electric circuit | |
US3912162A (en) | Furnace blower speed control | |
US3478532A (en) | Electronic head pressure control for condensing units | |
US3426969A (en) | Condition controller with bistable switching | |
US3594546A (en) | Air temperature control apparatus | |
GB1382047A (en) | Thermal storage heaters | |
US3469177A (en) | A.c. phase control system responsive to a sensed condition | |
JPS633486B2 (en) | ||
GB1597220A (en) | Gas-fired warm-air heating systems | |
US3548156A (en) | Electrical heater circuit | |
GB1373625A (en) | Pulse generators and applications thereof | |
GB1395889A (en) | Ac power control unit | |
GB1174561A (en) | Improvements in or relating to Control Apparatus | |
US3214597A (en) | Model train control | |
JPS6454687A (en) | Hot air blower with automatic voltage switching | |
JP2583908B2 (en) | DC motor drive circuit | |
GB905267A (en) | Synchronous motor control | |
SU1140104A1 (en) | Temperature control device | |
FR2301909A1 (en) | Low threshold relay switching high level currents - is intended for control of domestic electric radiators and uses NTC resistor | |
RU2023286C1 (en) | Temperature control device | |
JPS56113926A (en) | Combustion control apparatus | |
JP2690072B2 (en) | Energization display device in temperature control circuit | |
GB1468829A (en) | Temperature control circuits | |
JPS54134284A (en) | Temperature control device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |