GB1382047A - Thermal storage heaters - Google Patents

Thermal storage heaters

Info

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
Application number
GB3074671A
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.)
British Domestic Appliances Ltd
Original Assignee
British Domestic Appliances 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 British Domestic Appliances Ltd filed Critical British Domestic Appliances Ltd
Priority to GB3074671A priority Critical patent/GB1382047A/en
Publication of GB1382047A publication Critical patent/GB1382047A/en
Expired legal-status Critical Current

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

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.
GB3074671A 1971-06-30 1971-06-30 Thermal storage heaters Expired GB1382047A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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
US4546239A (en) Non-continuous sensing apparatus for a temperature control
US3215818A (en) Temperature control electric circuit
US3912162A (en) Furnace blower speed control
GB1277649A (en) Circuit arrangement
GB1091636A (en) A snap-action trigger circuit including a controlled rectifier switching device
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
GB1347627A (en) Temperature control circuit
US3548156A (en) Electrical heater circuit
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
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

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