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US 5,990,459 AGranted
System for controlling a plurality of resistive heating elements
AssigneesDavid & Baader-DBK-GmbH, Alcatel SEG AG
InventorsHans-Peter Feustel, Klaus Beetz, Franz Bohlender
Life of this patent
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Abstract
An electric heating system comprising at least two electric heating resistors, the heating power of which being adjusted by a control device comprising a plurality of controllers each one of which has one of the electric heating resistor associated with it, wherein the control range of the control means is distributed over the controllers and wherein a different control range is associated to each controller.
Claims13
An electric heating system, comprising:
- a plurality of heating resistors, each heating resistor of said plurality of heating resistors operable in at least one of three operational modes selected from the group consisting of:
- a first operational mode wherein said heating resistor generates said heating resistor's maximum heating power;
- a second operational mode wherein said heating resistor generates no heating power;
- a third operational mode wherein said heating resistor generates any of a plurality of intermediate heating powers between said heating resistor's maximum heating power and no heating power;
- a means for selecting as many of said plurality of heating resistors to operate in said first operational mode as necessary to generate a selected total target heating power;
- a means for selecting at least one of said heating resistors to operate in said third operational mode;
- and
- a control means for regulating said at least one selected heating resistor, said control means being adapted to vary said intermediate heating power generated by said at least one selected heating resistor to generate said selected total target heating power as the sum of all heating powers generated by all of said plurality of heating resistors which are operated in said first or third operational modes.
5 more elements
An electric heating system, comprising:
- a plurality of heating resistors, each heating resistor of said plurality of heating resistors operable in at least one of three operational modes selected from the group consisting of:
- a first operational mode wherein said heating resistor generates said heating resistor's maximum heating power;
- a second operational mode wherein said heating resistor generates no heating power;
- a third operational mode wherein said heating resistor generates any of a plurality of intermediate heating powers between said heating resistor's maximum heating power and no heating power;
- a control means for regulating a total target heating power of said electric heating system, said control means comprising a number of controllers corresponding to the number of heating resistors, each of said controllers being associated with a different heating resistor of said plurality of heating resistors;
- said controllers being adapted to regulate as many of said plurality of heating resistors in said first operational mode as necessary to generate said total target heating power;
- and
- said controllers further being adapted to select a single heating resistor to be operated in said third operational mode wherein said intermediate heating power generated by said selected single heating resistor is regulated to generate said total target heating power as the sum of all heating powers generated by all of said plurality of heating resistors which are operated in said first or third operational modes.
5 more elements
Dependencies are inferred from the claim text.