GB1302760A - - Google Patents

Info

Publication number
GB1302760A
GB1302760A GB1885270A GB1885270A GB1302760A GB 1302760 A GB1302760 A GB 1302760A GB 1885270 A GB1885270 A GB 1885270A GB 1885270 A GB1885270 A GB 1885270A GB 1302760 A GB1302760 A GB 1302760A
Authority
GB
United Kingdom
Prior art keywords
during
heater
negative half
half cycle
thyristor
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
GB1885270A
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
Priority claimed from JP44032423A external-priority patent/JPS4925975B1/ja
Priority claimed from JP4343569A external-priority patent/JPS4949589B1/ja
Application filed filed Critical
Publication of GB1302760A publication Critical patent/GB1302760A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/20Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24Control 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
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1906Control of temperature characterised by the use of electric means using an analogue comparing device

Landscapes

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

Abstract

1302760 Triggering thyristors MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 20 April 1970 [22 April 1969 27 May 1969] 18852/70 Heading H2F [Also in Division G3] In an electric blanket temperature control arrangement the blanket heater wire 17 (Fig. 3) is supplied during positive half cycles of an A.C. source 11 via a thyristor 15 and a diode 16. The thyristor is triggered only during negative half cycles by a pulse from a transformer 22 when a neon tube 21 fires and at this time a capacitor 23, which was charged during the negative half cycle via a diode 25, discharges through Th 15 and R24. The time constant of C23, R24 is such that the discharge of C23 continues to flow through Th 15 maintaining a holding current therein until current begins to flow therethrough from the source 11 during the next positive half-cycle. Thereby zero voltage switching of the heater load is obtained and radio frequency interference is substantially reduced. The desired temp. is preset on a resistor 18 and the actual temperature is sensed by a thermistor 19 between the heater wire 17 and a defector wire 20. The lower the temp. the higher the impedance of the thermistor and the greater the proportion of the supply voltage thereacross. When this voltage proportion is such that the firing potential of neon tube 21 is exceeded during a negative half cycle, the thyristor is fired and the heater is subsequently energized during the next position half cycle. If Th 15 is not triggered during a negative half cycle it will be blocked by the charge on C23. In an alternative embodiment Fig. 6 (not shown) the thermistor material is between a pair of signal wires one of which is connected to the neon tube pulse generator, and there is a pair of heater wires with insulation therebetween which insulation becomes molten above the desired temp. whereby the heaters will short circuit and blow a fuse cutting off the blanket heater current.
GB1885270A 1969-04-22 1970-04-20 Expired GB1302760A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP44032423A JPS4925975B1 (en) 1969-04-22 1969-04-22
JP4343569A JPS4949589B1 (en) 1969-05-27 1969-05-27

Publications (1)

Publication Number Publication Date
GB1302760A true GB1302760A (en) 1973-01-10

Family

ID=26370989

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1885270A Expired GB1302760A (en) 1969-04-22 1970-04-20

Country Status (4)

Country Link
DE (1) DE2018896C3 (en)
FR (1) FR2044736A1 (en)
GB (1) GB1302760A (en)
NL (1) NL150591B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289551A (en) * 1994-05-18 1995-11-22 Marcus John Milner Blackburn Method of electrical heating control

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601126A (en) * 1977-10-11 1981-10-28 Dreamland Electrical Appliance Heating circuits
JPS54138978A (en) * 1978-04-20 1979-10-27 Matsushita Electric Ind Co Ltd Temperature controller
JPS5541632A (en) * 1978-09-15 1980-03-24 Matsushita Electric Works Ltd Plane heater temperature control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289551A (en) * 1994-05-18 1995-11-22 Marcus John Milner Blackburn Method of electrical heating control

Also Published As

Publication number Publication date
NL150591B (en) 1976-08-16
DE2018896C3 (en) 1975-02-20
FR2044736A1 (en) 1971-02-26
DE2018896B2 (en) 1974-06-27
NL7005736A (en) 1970-10-26
DE2018896A1 (en) 1970-11-05

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years