GB1174561A - Improvements in or relating to Control Apparatus - Google Patents

Improvements in or relating to Control Apparatus

Info

Publication number
GB1174561A
GB1174561A GB28766/66A GB2876666A GB1174561A GB 1174561 A GB1174561 A GB 1174561A GB 28766/66 A GB28766/66 A GB 28766/66A GB 2876666 A GB2876666 A GB 2876666A GB 1174561 A GB1174561 A GB 1174561A
Authority
GB
United Kingdom
Prior art keywords
temperature
switch
transistor
bridge
resistor
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
GB28766/66A
Inventor
Peter Thomas Griffiths
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.)
Satchwell Controls Ltd
Original Assignee
Satchwell Controls 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 Satchwell Controls Ltd filed Critical Satchwell Controls Ltd
Priority to DE19671588679 priority Critical patent/DE1588679A1/en
Publication of GB1174561A publication Critical patent/GB1174561A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • 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
    • G05D23/20—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

Abstract

1,174,561. Control systems for heating resistors. SATCHWELL CONTROLS Ltd. 26 Jan., 1967 [8 Feb., 1966; 27 June, 1966], Nos. 5555/66 and 28766/66. Heading H2H. [Also in Division G3] An A.C. conducting electronic switch 41 energizes a load 42 for periods controlled by a resistor 61, which varies the time taken by each pulse of the unsmoothed output of a full wave rectifier bridge 16 to charge a capacitor 37 to a voltage at which a unijunction transistor 39 is switched on to produce a pulse in a transformer 40a-40b controlling the switch 41. The switch 41, which may be a bi-directional triode semi-conductor switch, thus energizes the heater 42 for that fraction of each cycle of the supply voltage which is necessary to produce the desired heating effect. In an arrangement controlling the temperature of a saucepan a thermistor (22, Fig. 2, not shown) is spring loaded against the pan to sense its temperature and is connected in a bridge comprising resistors (24-27), a desired temperature present potentiometer (31), and an unbalance sensing transistor (30). The collector voltage of the transistor (30) controls the conduction of the transistor (34) which charges the capacitor (37), the remainder of the circuit being as in Fig. 6. One arm of the bridge may be shunted by an ambient temperature compensating combination of a fixed resistor (28) and a temperature dependent resistor (29). The arrangement may also control oven temperature. In further alternatives (Figs. 5, 7, not shown), the semi-conductor bidirectional switch 41 is replaced by a full wave rectifier bridge with a silicon controlled rectifier (60) across a diagonal.
GB28766/66A 1966-02-08 1966-02-08 Improvements in or relating to Control Apparatus Expired GB1174561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19671588679 DE1588679A1 (en) 1966-02-08 1967-02-06 Control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB555566 1966-02-08

Publications (1)

Publication Number Publication Date
GB1174561A true GB1174561A (en) 1969-12-17

Family

ID=9798336

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28766/66A Expired GB1174561A (en) 1966-02-08 1966-02-08 Improvements in or relating to Control Apparatus

Country Status (1)

Country Link
GB (1) GB1174561A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135143A (en) * 1983-02-01 1984-08-22 Ti Russell Hobbs Ltd Electric heating appliance
GB2143053A (en) * 1983-05-18 1985-01-30 Glynwed Int Plc Boiling control for hotplate
GB2146804A (en) * 1983-09-20 1985-04-24 Thorn Emi Domestic Appliances A temperature control arrangement
GB2177858A (en) * 1985-07-10 1987-01-28 Valor Heating Ltd Control system for a domestic heating appliance
US4705963A (en) * 1984-09-18 1987-11-10 Smiths Industries Public Limited Company AC controlled diode switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135143A (en) * 1983-02-01 1984-08-22 Ti Russell Hobbs Ltd Electric heating appliance
GB2143053A (en) * 1983-05-18 1985-01-30 Glynwed Int Plc Boiling control for hotplate
GB2146804A (en) * 1983-09-20 1985-04-24 Thorn Emi Domestic Appliances A temperature control arrangement
US4705963A (en) * 1984-09-18 1987-11-10 Smiths Industries Public Limited Company AC controlled diode switch
GB2177858A (en) * 1985-07-10 1987-01-28 Valor Heating Ltd Control system for a domestic heating appliance

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees