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GB2011659A - Safety circuit for temperature- regulated electrical heating or warming devices - Google Patents

Safety circuit for temperature- regulated electrical heating or warming devices

Info

Publication number
GB2011659A
GB2011659A GB7848714A GB7848714A GB2011659A GB 2011659 A GB2011659 A GB 2011659A GB 7848714 A GB7848714 A GB 7848714A GB 7848714 A GB7848714 A GB 7848714A GB 2011659 A GB2011659 A GB 2011659A
Authority
GB
United Kingdom
Prior art keywords
heating
generator
temperature
power heating
low
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.)
Granted
Application number
GB7848714A
Other versions
GB2011659B (en
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.)
Beurer GmbH and Co
Original Assignee
Beurer GmbH and Co
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 Beurer GmbH and Co filed Critical Beurer GmbH and Co
Publication of GB2011659A publication Critical patent/GB2011659A/en
Application granted granted Critical
Publication of GB2011659B publication Critical patent/GB2011659B/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
    • 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
    • G05D23/1912—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can take more than two discrete values

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

A safety circuit for a temperature- regulated heating device permits 'power heating' during heating up but thereafter automatically switches to 'low- power heating' to prevent over-heating in the event of defects. A generator (ZG) supplies triggering signals to the triac (Tr) but a control generator (SG) blocks the generator (ZG) in every second half-wave of the a.c. supply voltage to provide 'low-power heating'. In 'power heating', blocking of signal generator (ZG) is eliminated and a desired value voltage determined by temperature regulator (TR) is raised. A comparator (V3) responsive to the temperature desired value generator (SWG) and an actual temperature sensor (F) switches storage means (SP) between the two states. A capacitor (C7) is charged during 'low-power heating' only if current flows through the heater during those half-waves in which the triggering signal is blocked and simultaneously discharged more slowly than charging so that if due to a fault a predetermined charge is reached, the circuit breaker (S) is opened to disconnect the supply. <IMAGE>
GB7848714A 1977-12-22 1978-12-15 Safety circuit for temperature regulated electrical heating or warming devices Expired GB2011659B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2757276A DE2757276C3 (en) 1977-12-22 1977-12-22 Safety circuit for temperature-controlled, alternating voltage operated electrical heating or warming devices

Publications (2)

Publication Number Publication Date
GB2011659A true GB2011659A (en) 1979-07-11
GB2011659B GB2011659B (en) 1982-06-16

Family

ID=6026888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7848714A Expired GB2011659B (en) 1977-12-22 1978-12-15 Safety circuit for temperature regulated electrical heating or warming devices

Country Status (3)

Country Link
DE (1) DE2757276C3 (en)
GB (1) GB2011659B (en)
NL (1) NL7811141A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028794A1 (en) * 1979-11-06 1981-05-20 Siemens Aktiengesellschaft Arrangement for monitoring the functioning of a heating arrangement
FR2503891A1 (en) * 1981-04-14 1982-10-15 Uk I Stankov Temp. control system with automatic compensation - for sensor feedback failure, for use with temp. sensitive moulding processes etc.
EP0086927A3 (en) * 1982-02-22 1983-09-28 Sten Ake Olaus Rydborn An apparatus for controlling a number of boilers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733294A1 (en) * 1987-10-02 1989-04-20 Telefunken Electronic Gmbh Circuit for controlling the electric power for a load (consumer)
US11346816B2 (en) * 2020-05-01 2022-05-31 The Boeing Company Apparatuses, systems, and methods for detecting kissing bonds in bonded joints

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028794A1 (en) * 1979-11-06 1981-05-20 Siemens Aktiengesellschaft Arrangement for monitoring the functioning of a heating arrangement
FR2503891A1 (en) * 1981-04-14 1982-10-15 Uk I Stankov Temp. control system with automatic compensation - for sensor feedback failure, for use with temp. sensitive moulding processes etc.
EP0086927A3 (en) * 1982-02-22 1983-09-28 Sten Ake Olaus Rydborn An apparatus for controlling a number of boilers

Also Published As

Publication number Publication date
GB2011659B (en) 1982-06-16
DE2757276C3 (en) 1981-01-22
DE2757276B2 (en) 1980-05-14
DE2757276A1 (en) 1979-06-28
NL7811141A (en) 1979-06-26

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee