GB1403044A - Electric blanket control circuit - Google Patents

Electric blanket control circuit

Info

Publication number
GB1403044A
GB1403044A GB4141772A GB4141772A GB1403044A GB 1403044 A GB1403044 A GB 1403044A GB 4141772 A GB4141772 A GB 4141772A GB 4141772 A GB4141772 A GB 4141772A GB 1403044 A GB1403044 A GB 1403044A
Authority
GB
United Kingdom
Prior art keywords
resistance
resistor
wire
switch
control device
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
GB4141772A
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.)
Nortel Networks Ltd
Original Assignee
Northern Electric 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 Northern Electric Co Ltd filed Critical Northern Electric Co Ltd
Publication of GB1403044A publication Critical patent/GB1403044A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
    • 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
    • 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
    • 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
    • H02H5/043—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 the temperature dependent resistor being disposed parallel to a heating wire, e.g. in a heating blanket
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54

Landscapes

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

Abstract

1403044 Protective arrangements NORTH ERNELECTRIC CO 23 Oct 1972 [26 Oct 1971] 41417/72 Heading H2K An electric blanket 10 of the kind having a heating element 12 and a sensing wire 14 separated by heat sensitive material has an overload protective arrangement comprising a radiation emitting diode 24 connected in series with the wire 14, and radiation responsive means 26 connected in series with a control device having contacts 20 in series with the element 12. Normally, the current through the wire 14 is such that the diode 24 emits sufficient light for the resistance of a light sensitive resistor 26, e.g. a cadmium sulphide cell, to be low, so that a bimetallic element 22 of the control device is sufficiently heated to maintain contacts 20 closed. Under overload conditions the resistance of the heat sensitive material in the blanket decreases, providing a low resistance path between the element 12 and the wire 14. The current through the diode 24 is reduced, the resistance of the resistor 26 increases and the control device opens its contacts 20. The blanket is controlled by a bi-metallic switch 16, 18 and a manual switch 28. To prevent incorrect operation due to a defective resistor 26, the switch 28 has a fixed contact 28c which is engaged momentarily by the moving contact as the switch is closed. This momentarily connects the resistor 26 directly across the supply so that it fuses if its initial resistance is too low.
GB4141772A 1971-10-26 1972-10-23 Electric blanket control circuit Expired GB1403044A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19218171A 1971-10-26 1971-10-26

Publications (1)

Publication Number Publication Date
GB1403044A true GB1403044A (en) 1975-08-13

Family

ID=22708595

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4141772A Expired GB1403044A (en) 1971-10-26 1972-10-23 Electric blanket control circuit

Country Status (5)

Country Link
US (1) US3673381A (en)
JP (1) JPS4850241A (en)
AU (1) AU4531672A (en)
CA (1) CA932009A (en)
GB (1) GB1403044A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517133A1 (en) * 1981-11-23 1983-05-27 Sunbeam Corp ELECTRICAL HEATING CIRCUIT AND HEATED COVER

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034185A (en) * 1975-09-02 1977-07-05 Northern Electric Company Electric blanket control circuit
GB1601126A (en) * 1977-10-11 1981-10-28 Dreamland Electrical Appliance Heating circuits
US4281237A (en) * 1979-03-05 1981-07-28 Sunbeam Corporation Safety circuit for electric bedcover
US10136735B2 (en) 2014-11-19 2018-11-27 Polygroup Macau Limited (Bvi) Systems and methods for air mattress temperature control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL121571C (en) * 1964-05-06 1966-07-15 Van Der Heem N.V. DEVICE FOR ELECTRICAL HEATING OF AN OBJECT
JPS447389Y1 (en) * 1965-08-30 1969-03-20
US3445631A (en) * 1966-03-14 1969-05-20 Indoheem Nv Safety system for an electrically heated blanket
US3356825A (en) * 1966-07-18 1967-12-05 Fieldcrest Mills Inc Electrically heated bedcover and protective circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517133A1 (en) * 1981-11-23 1983-05-27 Sunbeam Corp ELECTRICAL HEATING CIRCUIT AND HEATED COVER

Also Published As

Publication number Publication date
US3673381A (en) 1972-06-27
JPS4850241A (en) 1973-07-16
CA932009A (en) 1973-08-14
AU4531672A (en) 1974-02-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee