GB1184543A - Improvements in or relating to Electrical Heating Systems. - Google Patents

Improvements in or relating to Electrical Heating Systems.

Info

Publication number
GB1184543A
GB1184543A GB07857/66A GB1785766A GB1184543A GB 1184543 A GB1184543 A GB 1184543A GB 07857/66 A GB07857/66 A GB 07857/66A GB 1785766 A GB1785766 A GB 1785766A GB 1184543 A GB1184543 A GB 1184543A
Authority
GB
United Kingdom
Prior art keywords
temperature
circuit
heater
winding
determined
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
GB07857/66A
Inventor
Donald Portas
Charles Aneurin Davies
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.)
Dunlop Co Ltd
Original Assignee
Dunlop Co 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 Dunlop Co Ltd filed Critical Dunlop Co Ltd
Priority to US630450A priority Critical patent/US3496339A/en
Priority to DE19671615211 priority patent/DE1615211A1/en
Publication of GB1184543A publication Critical patent/GB1184543A/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
    • G05D23/2401—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 using a heating element as a sensing element
    • 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
    • G05D23/1913—Control of temperature characterised by the use of electric means using an analogue comparing device delivering a series of pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

1,184,543. Automatic temperature control systems. DUNLOP CO. Ltd. April 18, 1967 [April 23, 1966 (2)], Nos. 17856/66 and 17857/66. Heading G3R. A temperature control system for a de-icing heater having a resistance which varies with temperature comprises means for sensing changes in the heater resistance and a control means for reducing the power supplied to prevent the heater temperature rising above a determined level. The heater H is connected to a transformer voltage winding Vw and an opposing current winding I w which at the determined temperature reverse the phase of the secondary winding Sw output which through transistors Q1-Q3 and Q4-Q6, delays the firing angles of thyristors SCR1, 2 in proportion to the excess temperature. An over heat protective circuit, Fig.3, (not shown) comprises a transistor amplifier connected to winding Sw operating a relay which disconnects the supply and illuminates a warning lamp. In another arrangement voltages are derived from a heater having two sections of differing characteristics, Figs. 5 and 6 (not shown). A 3- phase star connected heater arrangement is described having thyristors in two mains leads, Fig. 7 (not shown). The output of winding Sw alternatively can be arranged through a variable ratio timer to cut-off the thyristors periodically for a determined time and an auxiliary circuit is arranged to operate at a higher temperature should the normal circuit fail. A low temperature circuit is also incorporated which at low temperatures periodically interrupts the supply when warming up the heaters. This circuit also incorporates thermistor detectors to cut-off the power at a determined thyristor temperature. An arcing detection circuit may be incorporated comprising three current transformers (T52-T54, Fig. 7, not shown) whose outputs are amplified in transistors (Q52-Q54, Fig. 9, not shown), and compared to cut-off power on inequality of current flow. This circuit is disabled if the inequality is due to an open circuit of one of the heaters.
GB07857/66A 1966-04-23 1966-04-23 Improvements in or relating to Electrical Heating Systems. Expired GB1184543A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US630450A US3496339A (en) 1966-04-23 1967-04-12 Electrical heating systems
DE19671615211 DE1615211A1 (en) 1966-04-23 1967-04-22 Control system for an electrical heating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1785666 1966-04-23

Publications (1)

Publication Number Publication Date
GB1184543A true GB1184543A (en) 1970-03-18

Family

ID=10102422

Family Applications (1)

Application Number Title Priority Date Filing Date
GB07857/66A Expired GB1184543A (en) 1966-04-23 1966-04-23 Improvements in or relating to Electrical Heating Systems.

Country Status (1)

Country Link
GB (1) GB1184543A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105410A1 (en) * 1982-09-30 1984-04-18 The B.F. GOODRICH Company Current circuit monitoring
GB2129584A (en) * 1982-10-01 1984-05-16 Gen Electric Phase control circuit for low voltage load
US4523084A (en) * 1981-09-02 1985-06-11 Oximetrix, Inc. Controller for resistive heating element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523084A (en) * 1981-09-02 1985-06-11 Oximetrix, Inc. Controller for resistive heating element
EP0105410A1 (en) * 1982-09-30 1984-04-18 The B.F. GOODRICH Company Current circuit monitoring
GB2129584A (en) * 1982-10-01 1984-05-16 Gen Electric Phase control circuit for low voltage load

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Legal Events

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