Heating system control
AssigneeHewlett-Packard Development Company, L.P.
InventorsRoger Bastardas Puigoriol, Francisco Javier Perez Gellida, Santiago Sanz Ananos, Juan Manuel Valero Navazo, Mikel Zuza Irurueta
Life of this patent
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Abstract
In one example, a heating system includes a first heater having a first resistive heating element, a second heater having multiple second resistive heating elements arranged in parallel with a group of the second heating elements having a combined resistance equal to a resistance of the first heating element, and a controller to periodically switch power between the first heating element and the group of second heating elements at a zero crossing of an AC power source.
Claims12
A heating system, comprising:
- a first heater having a first resistive heating element;
- a second heater having multiple second resistive heating elements arranged in parallel, a group of the second heating elements having a combined resistance equal to a resistance of the first heating element;
- and
- a controller to periodically switch power between the first heating element and the group of second heating elements at a zero crossing of an AC power source.
An air heating system for an inkjet printer having a print zone in which printing fluid may be dispensed on to a print substrate, the system comprising:
- a print zone heater to blow heated air into the print zone, the print zone heater having multiple resistive heating elements arranged in parallel;
- a dryer to blow heated air on to the print substrate after printing fluid is dispensed on to the substrate in the print zone;
- a vapor control heater to blow heated air into an air flow from the dryer after the air flow passes over the print substrate, the vapor control heater having multiple resistive heating elements;
- a print zone heating element having a resistance equal to a resistance of a vapor control heating element;
- and
- a controller to deliver power from an AC power source simultaneously to print zone and vapor control heating elements and to periodically switch power, at a zero crossing of the AC power source, between the print zone and vapor control heating elements having the same resistance.
A control process for a heating system having a first heater and a second heater, the process comprising:
- sharing AC power between the first heater and the second heater;
- and
- switching power between a resistive heating element in the first heater and a group of resistive heating elements in the second heater while keeping the combined resistance of both heaters constant when sharing power.
Dependencies are inferred from the claim text.