(19)
(11) EP 4 057 773 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.11.2022 Bulletin 2022/48

(43) Date of publication A2:
14.09.2022 Bulletin 2022/37

(21) Application number: 22161467.0

(22) Date of filing: 10.03.2022
(51) International Patent Classification (IPC): 
H05B 1/02(2006.01)
F24H 1/10(2022.01)
 H05B 3/48(2006.01)
F24H 9/20(2022.01)
(52) Cooperative Patent Classification (CPC):
H05B 1/0244; H05B 3/48; F24H 1/103; F24H 9/2028
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 10.03.2021 US 202117197333

(71) Applicant: Watlow Electric Manufacturing Company
St. Louis, MO 63146 (US)

(72) Inventor:
  • EVERLY, Mark
    St. Charles MO 63301 (US)

(74) Representative: Germain Maureau 
12, rue Boileau
69006 Lyon
69006 Lyon (FR)

   


(54) HEATER BUNDLES FOR THERMAL GRADIENT COMPENSATION


(57) A heater bundle (12) includes a plurality of heater assemblies (18), at least one of the heater assemblies (18) including a plurality of heater units, at least one of the heater units defining at least one independently controlled heating zone. A thermal provision is configured to modify a thermal conductance along a length of the at least one heater assembly (18) to compensate for non-uniform temperatures within at least one heater unit. The heater bundle (12) includes a power supply device (14) including a controller (15) configured to modulate power to the independently controlled heating zone through the power conductors based on the determined temperature to provide a desired power output along a length of at least one heater assembly (18).







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