GB1242899A - Electric heater control circuit - Google Patents

Electric heater control circuit

Info

Publication number
GB1242899A
GB1242899A GB4866468A GB4866468A GB1242899A GB 1242899 A GB1242899 A GB 1242899A GB 4866468 A GB4866468 A GB 4866468A GB 4866468 A GB4866468 A GB 4866468A GB 1242899 A GB1242899 A GB 1242899A
Authority
GB
United Kingdom
Prior art keywords
heater
resistor
thyristor
supply
control circuit
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
GB4866468A
Inventor
Carrel Hilton Dykes
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
Priority to GB4866468A priority Critical patent/GB1242899A/en
Publication of GB1242899A publication Critical patent/GB1242899A/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
    • G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
    • G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor

Landscapes

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

Abstract

1,242,899. Automatic temperature control systems. NORTHERN ELECTRIC CO. Oct. 14, 1968, No. 48664/68. Heading G3R. A control circuit for an electrical heater has a heater current switching means which is biased by a phase advancing circuit so that complete half cycles are admitted to the heater dependent on the temperature of the heater element. A heat 10 is serially connected with a thyristor 12 and another heater 44 which influences a temperature dependent resistor 40. An RC circuit 20, 22 connected to gate 18 advances the phase of a supply 14, 16. When the supply is first connected a transistor 25 will be biased conductively allowing current to flow through capacitor 20 and resistor 22 thus causing conduction of the thyristor 12. After a quantity of current has passed through resistor 44, the resistance of resistor 40 is lowered hence transistor 24 and thyristor 12 will be rendered non-conductive. In an alternative arrangement the upper connection of capacitor 20 may be connected to the supply 14.
GB4866468A 1968-10-14 1968-10-14 Electric heater control circuit Expired GB1242899A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4866468A GB1242899A (en) 1968-10-14 1968-10-14 Electric heater control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4866468A GB1242899A (en) 1968-10-14 1968-10-14 Electric heater control circuit

Publications (1)

Publication Number Publication Date
GB1242899A true GB1242899A (en) 1971-08-18

Family

ID=10449461

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4866468A Expired GB1242899A (en) 1968-10-14 1968-10-14 Electric heater control circuit

Country Status (1)

Country Link
GB (1) GB1242899A (en)

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