(19)
(11) EP 4 057 776 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.12.2022 Bulletin 2022/51

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

(21) Application number: 22161472.0

(22) Date of filing: 10.03.2022
(51) International Patent Classification (IPC): 
H05B 3/48(2006.01)
F24H 1/10(2022.01)
 H05B 1/02(2006.01)
F24H 9/20(2022.01)
(52) Cooperative Patent Classification (CPC):
H05B 1/0244; H05B 3/48; H05B 2203/037; 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 202117197556

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

(72) Inventors:
  • EVERLY, Mark
    St. Charles MO 63301 (US)
  • QUANDT, Jeremy J.
    Winona MN 55987 (US)
  • JYSTAD, Steven T
    St. Louis, MO 63146 (US)

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

   


(54) HEATER BUNDLES HAVING VIRTUAL SENSING FOR THERMAL GRADIENT COMPENSATION


(57) A system includes a heater bundle having at least one heater assembly (18) with a plurality of heater units. At least one of the heater units (52) defines at least one independently controlled heating zone, and a plurality of power conductors are electrically connected to the heater units. A power supply device (14) includes a controller (15) configured to modulate power to the at least one independently controlled heating zone through the power conductors, and the controller (15) is configured to calculate temperature within the at least one heater unit based on a predefined model and at least one input, and the controller (15) modulates power to the at least one heater unit based on the calculated temperature.







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