EP1450582A1 - Dispositif à cable chauffant CTP comprenant un dispositif de limitation de courant - Google Patents
Dispositif à cable chauffant CTP comprenant un dispositif de limitation de courant Download PDFInfo
- Publication number
- EP1450582A1 EP1450582A1 EP04290433A EP04290433A EP1450582A1 EP 1450582 A1 EP1450582 A1 EP 1450582A1 EP 04290433 A EP04290433 A EP 04290433A EP 04290433 A EP04290433 A EP 04290433A EP 1450582 A1 EP1450582 A1 EP 1450582A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- current
- ctp
- temperature
- heating cable
- 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.)
- Withdrawn
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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
- H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
- H05B1/0277—Electric radiators
-
- 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
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
-
- 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
- H05B2203/019—Heaters using heating elements having a negative temperature coefficient
-
- 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
- H05B2203/02—Heaters using heating elements having a positive temperature coefficient
Definitions
- the invention relates to the field of heating cables Self-regulating.
- These self-regulating heating cables are generally used in individual heating applications of the habitat or in temperature maintenance applications of fluid lines (Tracing).
- These cables consist of carrying conductors embedded in a semiconductor resin with positive temperature coefficient (PTC).
- PTC positive temperature coefficient
- the heating capacity of the heating cable varies in depending on its temperature. This power decreases when the cable temperature increases to self-regulate to an equilibrium value.
- This oversizing ensures a functioning of the system of even when it is switched on (for example in the case of frost protection or at very low temperatures).
- current management in the cable can be by an unloader (cascado-cyclic start) in order to avoid current calls too important.
- An object of the invention is to overcome these disadvantages.
- the invention proposes a heating device comprising a self-regulating heating cable with a positive temperature coefficient (PTC), characterized in that it further comprises a device for limiting the current flowing through the heating element.
- PTC positive temperature coefficient
- the device for limiting current in the CTP heating cable includes a resistive element to negative temperature coefficient (NTC) connected in series with the CTP cable.
- NTC negative temperature coefficient
- the negative temperature coefficient (NTC) element has a opposite to that of the CTP cable: indeed, the resistance of the NTC element decreases when its temperature or the current flowing through it increases. So when powering up the CTP cable, the power is limited by the CTN element.
- the CTN element is chosen so that, during the heating of the CTP cable, the resistance of the CTN element decreases to become negligible with respect to the resistance of the CTP cable. Through Consequently, the CTN element does not modify the properties of the device of heating when it has reached its steady state.
- the device for current limitation in the heating cable CTP includes an element clipping circuit arranged in series with the CTP cable and an element of switching adapted to selectively direct current to the element clipping.
- This device makes it possible to reduce the amplitude of the current flowing through the CTP cable when it is turned on. As soon as the temperature of the cable CTP is sufficient, the switching element derives the current of the element clipping to stop clipping.
- the invention has the advantage of providing an autonomous device for current management in a self-regulating heating cable.
- the heating device represented comprises a thermal regulation module 3 connected to a probe 2 allowing measure the ambient temperature.
- This thermal regulation module 3 receives as input a temperature setpoint 1.
- the heating device further comprises a heating cable self-regulating device 7 having a positive temperature coefficient (PTC), powered by an AC voltage generator 5.
- PTC positive temperature coefficient
- the heater also includes a relay 4 controlled by the thermal regulation module 3 and a device for limitation of the current in the CTP cable 7.
- This device for limiting the current includes a resistive component with a negative temperature coefficient (CTN) 6 arranged in series and thermally coupled with the CTP cable 7.
- CTN negative temperature coefficient
- the CTN component is dimensioned so that its resistance varies depending on its temperature.
- the resistance of the CTN component decreases when its temperature increases.
- the thermal regulation module 3 continuously compares the ambient temperature measured by probe 2 with the temperature of setpoint 1.
- thermal control module 3 control relay 4 to keep it in an open state. In this configuration, the CTN 6 component and the CTP 7 cable are not powered by the AC voltage generator 5.
- the thermal regulation module 3 controls the closing The NTC component 6 and the CTP cable 7 are then powered by the generator 5.
- the heating module thermal regulation 3 controls the closing of relay 4.
- the passage of current in the CTP 7 cable causes the heating of the latter by effect Joule.
- the CTP cable 7 being thermally coupled to the CTN component 6, the latter sees its temperature increase. With the increase of the temperature, the resistance of the CTP cable 7 increases while the resistance of the CTN component decreases.
- Figure 2 shows the variations of the resistances of the component CTN and CTP cable according to their temperature. This figure also represents the variation of the overall resistance of the component CTN and CTP cable associated in series. We see that this resistance overall is always greater than the resistance of the CTP cable alone.
- the CTN component helps maintain the resulting resistance above a certain threshold.
- the CTN component has negligible resistance when the CTP cable has reached its steady state.
- Figure 3 shows the variation of the current in the CTP cable in time function during a start-up phase. It is represented in lines dotted on this figure the variation of the current that would have been obtained if the heating device did not include the CTN component. We aknowledge that the presence of the CTN component makes it possible to suppress the peak of current occurring at the start of the heater.
- Such a device for limiting current limits progressive variation of current in the CTP cable 7.
- the CTN component is sized so that its resistance varies according to the current that the crosses and no longer according to its temperature. So the resistance of the CTN element decreases with the current flowing through it. In this variant, it is no longer necessary for the CTN component to be thermally coupled to the CTP cable.
- FIG. 4 represents a heating device according to another embodiment of the invention.
- the heating device of FIG. 4 comprises a thermal regulation module 3 connected to a temperature sensor 2 and receiving a temperature setpoint 1.
- the thermal regulation module 3 controls opening and closing a relay 4 of the heating circuit.
- the heating circuit includes a heating cable CTP 7 and an alternating voltage generator 5 for the supply of this cable.
- the heating device further comprises a Current limiting device traversing the CTP cable 7.
- the current limiting device comprises a diode 8 disposed in series with the CTP 7 cable and a relay 9 arranged in parallel with the diode 8. This relay 9 is controlled by a clock 10 connected to the module of thermal regulation 3.
- the thermal regulation module 3 continuously compares the ambient temperature measured by probe 2 with the temperature of setpoint 1.
- thermal control module 3 control relay 4 to keep it in an open state. In this configuration, the CTP 7 cable is not powered by the generator of AC voltage 5.
- the thermal regulation module 3 controls the closing relay 4.
- the CTP cable 7 is then supplied by the generator 5.
- the heating module thermal control 3 controls the closing of the relay 4.
- the clock 10 detects the closing command of relay 4 and triggers a timing.
- the AC voltage generator 5 supplies the CTP cable 7.
- the diode 8 only passing when the current flows through given direction in the heating circuit, the current supplied by the generator 5 is clipped.
- the diode 8 suppresses an alternation of the signal. Through therefore, the overall intensity flowing in the circuit is divided by a factor 2.
- the clock 10 controls the closing of the relay 9.
- the supply current of the CTP cable 7 is thus branched towards the branch of the relay 9.
- the cable CTP 7 is powered by the entire AC current.
- the pre-programmed delay time can be changed at any time by a user or technician intervening on the installation.
- the current limiting device comprises means for adjusting the delay time.
- FIG. 5 represents a variant of the device of FIG. which the delay time is determined by the module of temperature regulation 3 as a function of the difference between the temperature of set point 1 and the ambient temperature measured by probe 2.
- Figure 6 shows the variation of the current flowing through the CTP cable 7 as a function of time. Dotted lines are shown in this figure the variation in current that would have been obtained if the heating circuit did not include diode 8 and relay 9. It is found that the value of the current supplied to the CTP cable 7 during the delay phase T (when relay 9 is open) is divided by 2 with respect to the current that would be supplied if the circuit did not have a current limiting device.
Abstract
Description
- soit sa résistance diminue avec le courant qui le traverse,
- soit sa résistance diminue lorsque sa température augmente. Dans ce dernier cas, l'élément CTN est couplé thermiquement avec le câble CTP afin que les deux éléments soient en permanence à la même température.
- la figure 1 représente schématiquement un dispositif de chauffage comprenant un câble chauffant CTP ainsi qu'un dispositif de limitation de courant conforme à un premier mode de réalisation de l'invention,
- la figure 2 représente la variation des résistances des éléments CTP et CTN du dispositif de la figure 1 en fonction de leur température,
- la figure 3 représente la variation du courant dans le câble chauffant CTP de la figure 1 en fonction du temps,
- les figures 4 et 5 représentent schématiquement des dispositifs de chauffage comprenant un dispositif de limitation de courant conforme à un deuxième mode de réalisation de l'invention,
- la figure 6 représente la variation du courant dans le câble CTP des dispositifs des figures 4 et 5 en fonction du temps.
Claims (11)
- Dispositif de chauffage comprenant un câble chauffant autorégulant (7) à coefficient de température positif (CTP), caractérisé en ce qu'il comprend en outre un dispositif de limitation du courant traversant l'élément chauffant (7).
- Dispositif selon la revendication 1, caractérisé en ce que le dispositif de limitation de courant traversant le câble chauffant CTP (7) comprend un élément résistif (6) à coefficient de température négatif (CTN) monté en série avec le câble chauffant CTP (7).
- Dispositif selon la revendication 2, caractérisé en ce que l'élément CTN est couplé thermiquement avec le câble chauffant CTP (7).
- Dispositif selon l'une des revendications 2 ou 3, caractérise en ce que l'élément résistif CTN (6) est choisi de sorte que sa résistance soit négligeable lorsque le câble chauffant CTP (7) a atteint son régime stabilisé.
- Dispositif selon la revendication 1, caractérisé en ce que le dispositif de limitation de courant traversant le câble chauffant CTP (7) comprend un élément d'écrêtage (8) disposé en série avec le câble CTP et un élément de commutation (9) apte à diriger sélectivement le courant vers l'élément d'écrêtage (8).
- Dispositif selon la revendication 5, caractérisé en ce que le dispositif de limitation de courant comprend des moyens de chronométrage (10) aptes à détecter le passage du courant dans le câble chauffant CTP (7) et à l'issue d'une durée de temporisation (T) commander l'élément de commutation (9) pour dériver le courant vers une branche parallèle à l'élément d'écrêtage (8).
- Dispositif selon la revendication 6, caractérisé en ce que la durée de temporisation (T) est préprogrammée.
- Dispositif selon la revendication 7, caractérisé en ce que la durée de temporisation (T) est modifiable.
- Dispositif selon la revendication 6, caractérisé en ce que la durée de temporisation (T) est déterminée en fonction de la différence entre une température de consigne (1) et une température mesurée par un capteur de température (2).
- Dispositif selon l'une des revendications 5 à 9, caractérisé en ce que l'élément d'écrêtage (8) est une diode.
- Dispositif selon l'une des revendications qui précèdent, caractérisé en ce qu'il comprend un module de régulation thermique (3) apte à commander un élément de commutation (4) pour permettre ou non le passage du courant dans le câble chauffant CTP (7) en fonction de la différence entre une température de consigne (1) et une température mesurée par un capteur de température (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0301926 | 2003-02-18 | ||
FR0301926A FR2851404A1 (fr) | 2003-02-18 | 2003-02-18 | Dispositif a cable chauffant ctp comprenant un dispositif de limitation de courant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1450582A1 true EP1450582A1 (fr) | 2004-08-25 |
Family
ID=32732008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04290433A Withdrawn EP1450582A1 (fr) | 2003-02-18 | 2004-02-18 | Dispositif à cable chauffant CTP comprenant un dispositif de limitation de courant |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1450582A1 (fr) |
FR (1) | FR2851404A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006067485A1 (fr) | 2004-12-24 | 2006-06-29 | Heat Trace Limited | Controle de cable chauffant |
FR2938397A1 (fr) * | 2008-09-05 | 2010-05-14 | Valeo Systemes Dessuyage | Chauffage a thermistance ctp |
EP2385531A1 (fr) * | 2010-05-05 | 2011-11-09 | Grundfos Management a/s | Câble d'alimentation avec ntc thermistance intégré |
US20180063886A1 (en) * | 2016-09-01 | 2018-03-01 | Hamilton Sundstrand Corporation | Ptc heater with autonomous control |
CN109693514A (zh) * | 2017-10-23 | 2019-04-30 | 埃贝赫卡腾有限两合公司 | 用于机动车辆的电加热器 |
WO2021244802A1 (fr) * | 2020-06-05 | 2021-12-09 | Eugen Forschner Gmbh | Circuit électrique pour un système de conduite de fluide |
WO2022223089A2 (fr) | 2021-04-22 | 2022-10-27 | Soynt Oü | Procédé et dispositif de régulation de charge à ptc |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014195631A1 (fr) * | 2013-06-04 | 2014-12-11 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Capteur de temperature a pate thermosensible |
FR3006440B1 (fr) * | 2013-06-04 | 2015-07-17 | Commissariat Energie Atomique | Capteur de temperature a seuil de detection ajustable |
MX2018010593A (es) | 2016-03-02 | 2019-08-12 | Watlow Electric Mfg | Dispositivo de almacenamiento termico para uso en un sistema de flujo de fluido. |
CN111654932B (zh) * | 2020-06-17 | 2022-04-12 | 贵阳中安科技集团有限公司 | 一种电缆加热装置及电缆加热方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070916A1 (fr) * | 1999-05-14 | 2000-11-23 | Asuk Technologies, Llc | Dispositifs chauffants electriques et fusibles reenclenchables |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4849611A (en) * | 1985-12-16 | 1989-07-18 | Raychem Corporation | Self-regulating heater employing reactive components |
GB2340713B (en) * | 1998-08-12 | 2003-03-12 | Otter Controls Ltd | Improvements relating to electric heating elements |
GB2345597B (en) * | 1999-01-11 | 2003-07-02 | Otter Controls Ltd | Improvements relating to thermal controls |
-
2003
- 2003-02-18 FR FR0301926A patent/FR2851404A1/fr not_active Withdrawn
-
2004
- 2004-02-18 EP EP04290433A patent/EP1450582A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070916A1 (fr) * | 1999-05-14 | 2000-11-23 | Asuk Technologies, Llc | Dispositifs chauffants electriques et fusibles reenclenchables |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006067485A1 (fr) | 2004-12-24 | 2006-06-29 | Heat Trace Limited | Controle de cable chauffant |
EP1829425B1 (fr) * | 2004-12-24 | 2013-06-19 | Heat Trace Limited | Contrôle de cable chauffant |
FR2938397A1 (fr) * | 2008-09-05 | 2010-05-14 | Valeo Systemes Dessuyage | Chauffage a thermistance ctp |
EP2385531A1 (fr) * | 2010-05-05 | 2011-11-09 | Grundfos Management a/s | Câble d'alimentation avec ntc thermistance intégré |
US20180063886A1 (en) * | 2016-09-01 | 2018-03-01 | Hamilton Sundstrand Corporation | Ptc heater with autonomous control |
EP3291639A1 (fr) * | 2016-09-01 | 2018-03-07 | Hamilton Sundstrand Corporation | Chauffage ptc à commande autonome |
US10368394B2 (en) | 2016-09-01 | 2019-07-30 | Hamilton Sundstrand Corporation | PTC heater with autonomous control |
CN109693514A (zh) * | 2017-10-23 | 2019-04-30 | 埃贝赫卡腾有限两合公司 | 用于机动车辆的电加热器 |
WO2021244802A1 (fr) * | 2020-06-05 | 2021-12-09 | Eugen Forschner Gmbh | Circuit électrique pour un système de conduite de fluide |
WO2022223089A2 (fr) | 2021-04-22 | 2022-10-27 | Soynt Oü | Procédé et dispositif de régulation de charge à ptc |
Also Published As
Publication number | Publication date |
---|---|
FR2851404A1 (fr) | 2004-08-20 |
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