EP0629103B1 - Verfahren und Schaltungsanordnung zur Temperaturregelung von mit Wechselstrom betriebenen Heizgeräten - Google Patents

Verfahren und Schaltungsanordnung zur Temperaturregelung von mit Wechselstrom betriebenen Heizgeräten Download PDF

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Publication number
EP0629103B1
EP0629103B1 EP94104875A EP94104875A EP0629103B1 EP 0629103 B1 EP0629103 B1 EP 0629103B1 EP 94104875 A EP94104875 A EP 94104875A EP 94104875 A EP94104875 A EP 94104875A EP 0629103 B1 EP0629103 B1 EP 0629103B1
Authority
EP
European Patent Office
Prior art keywords
diode
temperature
current
heating conductor
resistor
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 - Lifetime
Application number
EP94104875A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0629103A3 (en
EP0629103A2 (de
Inventor
Ernst Merk
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 EP0629103A2 publication Critical patent/EP0629103A2/de
Publication of EP0629103A3 publication Critical patent/EP0629103A3/xx
Application granted granted Critical
Publication of EP0629103B1 publication Critical patent/EP0629103B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0272—For heating of fabrics
    • 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 [2D] plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional [2D] 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 [2D] plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
    • 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
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to a method for regulating the temperature of heating devices operated with alternating current, in particular.
  • Heating pads, heating blankets or the like which have a one-part or multi-part heating conductor, furthermore a series-connected, thermally coupled to the heating conductor, temperature-dependent switching element, and are provided with an actuator for specifying the target temperature.
  • the invention further relates to a circuit arrangement for regulating the temperature of heaters operated with alternating current, in particular. Heating pads, heated blankets or the like, with a one-part or multi-part heating conductor and also with a series-connected heating conductor to the Heat conductor thermally coupled, temperature-dependent switching element, as well as with an actuator for specifying the target temperature.
  • Circuit arrangements of this type are known in numerous variants, with integrated circuits which have been specially manufactured increasingly being used for temperature control. Even if these modules can be manufactured comparatively cheaply today, they represent a not inconsiderable cost factor with simpler and therefore inexpensive heaters.
  • the invention has for its object to provide a method and a circuit arrangement for temperature control, which allows a step-by-step or stepless specification of the target temperature with minimal effort on conventional electronic standard components and simple circuitry.
  • this object is achieved in that in one direction of flow of the current the supply voltage drops essentially completely at the heating conductor and in the opposite direction of flow of the current the supply voltage largely drops at a preheating resistor which is thermally connected to the temperature-dependent switching element Interaction is, the current flow in the opposite direction of flow through the actuator is switchable and / or variable.
  • the advantage achieved by the invention is that one half-wave of the alternating current is used to heat the heating conductor, while the Another half-wave is used to primarily heat the preheating resistor, which, via its thermal interaction with the temperature-dependent switching element, switches it off when the temperature of the heating conductor is still significantly below the switching temperature of the switching element.
  • An increase in the heating power in the preheating resistor therefore results in a lower temperature of the heater. If, on the other hand, the current is reduced or completely interrupted by the preheating resistor, the switching element only switches off when the switching temperature is reached simply by heating the heating conductor. In this case the heater will reach its maximum temperature.
  • the invention is achieved in that a preheating resistor is arranged in the current path, which is in thermal interaction with the temperature-dependent switching element, and further a first diode is provided, which is sufficient only for one of the two current flow directions for noticeable heating of the preheating resistor Current made possible by the preheating resistor, this current being switchable and / or variable by the actuator.
  • the preheating resistor is arranged in series with the heating conductor and the diode Preheating resistor connected in parallel. In one current flow direction, the current then flows via the heating conductor and the diode, so that only the forward voltage of the diode is present at the preheating resistor. On the other hand, the diode blocks in the opposite direction of current flow, so that the entire current must flow through the preheating resistor. This current flow direction therefore ensures a corresponding heating of the preheating resistor and thus an earlier switching off of the switching element.
  • the preheating resistor has a higher resistance than the heating conductor, since then the preheating resistor is almost exclusively heated in the corresponding current flow direction. It has turned out to be favorable if the resistance value of the preheating resistor is approximately twenty times greater than that of the heating conductor.
  • the actuator is formed in a correspondingly simple embodiment by a second diode connected in the same direction of flow as the first diode and a switch bridging the second diode. If the switch is open, the current can only flow in one flow direction, with the result that the switching element only switches off when the maximum temperature is reached. However, if the switch is closed, the actuator enables current to flow in both directions. In this case, heating of the Preheating resistor, whereby the switching element switches off earlier, so the heater only takes on a lower temperature.
  • the actuator is formed by a second diode and a variable resistor bridging the second diode.
  • the current flow through the preheating resistor can be influenced via the resistance, so that the actuator allows a continuous specification of the temperature setpoint instead of a gradual setting.
  • the heating conductor can be formed in a conventional embodiment by a double cord, in which case the preheating resistor and the switching element are connected between the two heating conductor windings of the double cord.
  • the switching element is expediently formed by a bimetal switch.
  • the circuit arrangement shown in the drawing is used for temperature control with alternating current operated heaters, in particular heating pads, electric blankets or the like.
  • the circuit arrangement consists of a two-part heating conductor 1, and also of a temperature-dependent switching element 2 connected in series thereto, which is thermally coupled to the heating conductor 1. Finally, the circuit arrangement comprises an actuator 3 for specifying the target temperature.
  • the actuator 3 is, as indicated by the dashed frame 4, usually arranged in a cord switch, while the other components enclosed by the second frame 5 are part of the heater.
  • a preheating resistor 6 is arranged in the current path of the heater and is in thermal interaction with the temperature-dependent switching element 2. Furthermore, a first diode 7 is provided, which allows a current sufficient to noticeably heat the preheating resistor 6 to flow through the preheating resistor 6 only during one of the two current flow directions.
  • the preheating resistor 6 is arranged in series with the two heating conductors 1, the first diode 7 being connected in parallel with the preheating resistor 6. In one current flow direction, the preheating resistor 6 is bridged by the first diode 7, so that only its forward voltage drops, while the diode 7 blocks in the opposite direction of current flow, so that the current can then flow exclusively through the preheating resistor 6.
  • the resultant heating of the preheating resistor 6 leads to an earlier switching off of the switching element 2, so that the heater only takes on a lower temperature overall.
  • the size of this by the preheating resistor 6 flowing current is either switchable or variable by the actuator 3, which will be discussed later.
  • the preheating resistor 6 is significantly higher-resistance than the heating conductor 1 and can have, for example, twenty times the value of the heating conductor 1. The greater the ratio of the resistance values of the heating conductor 1 on the one hand and the preheating resistor 6 on the other hand, the more pronounced is the heating power output in the heating conductor 1 or in the preheating resistor 6 depending on the respective current flow direction.
  • the actuator 3 is formed by a second diode 8 connected in the same direction of flow as the first diode 7 and a switch 9 bridging the second diode 8. If this switch 9 is open, the current can only flow in the direction by which only the heating conductor 1 is heated. When switch 9 is open, the heater will therefore reach its maximum temperature determined by the switching temperature of switching element 2. However, if the switch 9 is closed, the current can flow in both directions with the result that the preheating resistor 6 is heated and the switching element 2 switches off earlier.
  • the actuator 3 is formed by a second diode 8 and a variable resistor 10 bridging the second diode 8.
  • a further switch 12 is provided in each supply line 11, by means of which the heater can be switched off.
  • the actuator 3 housed in a conventional cord switch can be connected to the heater via a two-wire supply line 13, while at least one third line is required in known temperature control devices.
  • the heating conductor 1 can be formed in a manner not shown in the drawing by a double cord, in which case the preheating resistor 6 and the switching element 2 are connected to the two ends of the double cord, as indicated in the circuit diagram.
  • the switching element 2 is also formed in a manner not shown by a bimetal switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Resistance Heating (AREA)
  • Control Of Temperature (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
EP94104875A 1993-05-10 1994-03-28 Verfahren und Schaltungsanordnung zur Temperaturregelung von mit Wechselstrom betriebenen Heizgeräten Expired - Lifetime EP0629103B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4315488A DE4315488C2 (de) 1993-05-10 1993-05-10 Verfahren und Schaltungsanordnung zur Temperaturregelung von mit Wechselstrom betriebenen Heizgeräten
DE4315488 1993-05-10

Publications (3)

Publication Number Publication Date
EP0629103A2 EP0629103A2 (de) 1994-12-14
EP0629103A3 EP0629103A3 (en) 1995-01-11
EP0629103B1 true EP0629103B1 (de) 1997-09-10

Family

ID=6487671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104875A Expired - Lifetime EP0629103B1 (de) 1993-05-10 1994-03-28 Verfahren und Schaltungsanordnung zur Temperaturregelung von mit Wechselstrom betriebenen Heizgeräten

Country Status (5)

Country Link
EP (1) EP0629103B1 (da)
AT (1) ATE158133T1 (da)
DE (1) DE4315488C2 (da)
DK (1) DK0629103T3 (da)
ES (1) ES2106395T3 (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2116889B1 (es) * 1995-07-28 1999-03-01 Especialidades Electricas Daga Dispositivo para el control de la temperatura en almohadillas, mantas, calientacamas electricos y similares.
DE19943059B4 (de) 1999-09-09 2006-11-23 Daimlerchrysler Ag System zur Auskondensation einer Flüssigkeit aus einem Gasstrom
DE10203197A1 (de) * 2002-01-25 2003-08-07 Beurer Gmbh & Co Elektrisch beheizbare Wärmevorrichtung mit einem schmiegsamen Heizkörper
DE10317452B3 (de) * 2003-01-23 2004-11-04 Beurer Gmbh & Co Schmiegsames Wärmegerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245149A (en) * 1979-04-10 1981-01-13 Fairlie Ian F Heating system for chairs
NO152720C (no) * 1983-03-09 1985-11-06 Per Wesseltoft Elektrisk varmeinnretning.
JPS59212925A (ja) * 1983-05-18 1984-12-01 Matsushita Electric Ind Co Ltd 加熱装置
DE4108725A1 (de) * 1991-03-18 1992-09-24 Inter Control Koehler Hermann Thermische schalteinheit fuer elektrische waermegeraete

Also Published As

Publication number Publication date
ES2106395T3 (es) 1997-11-01
DE4315488A1 (de) 1994-11-17
EP0629103A3 (en) 1995-01-11
DK0629103T3 (da) 1998-04-20
DE4315488C2 (de) 1998-02-12
ATE158133T1 (de) 1997-09-15
EP0629103A2 (de) 1994-12-14

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