Power allocation in printing devices

A printing device, comprising:

• a conditioning system having a plurality of heater systems including a first heater system having a first thermal time constant and a second heater system having a second thermal time constant, the first thermal time constant is greater than the second thermal time constant, each of the plurality of heater systems to provide an independent load request;
• a power source operably coupled to the conditioning system, the power source to provide a power output to the plurality of heater systems;
• and
• a controller operably coupled to the plurality of heater systems and the power source to distribute the power output between the plurality of heater systems, the controller to
• allocate a plurality of power grants based on a general power arbitration of a power source in response to the independent load requests of the plurality of heater systems, the plurality of power grants include a first power grant based on a first load request and a second power grant based on a second load request;
• and
• adjust the plurality of power grants to provide a plurality of adjusted grants from the power output to the plurality of heater systems, including apportionment of a measure of the first power grant to the second power grant rather than to provide the measure of the first power grant to the first heater system if a print substance density is within a selected print substance density threshold and the first load request is within a selected load threshold.

A non-transitory computer readable medium to store computer executable instructions to control a processor to:

• receive a plurality of independent load requests from each of a plurality of printing device heater systems including receive a first load request from a first printing device heater system with a first thermal time constant and receive a second load request from a second printing device heater system with a second thermal constant, the first thermal constant being greater than the second thermal constant;
• allocate a plurality of power grants based on a general power arbitration of a power source in response to the plurality of independent load requests, the plurality of power grants including a first power grant based on the first load request and including a second power grant based on the second load request;
• and
• adjust the plurality of power grants to provide a plurality of adjusted grants from the power source to the plurality of printing device heater systems, including apportionment of a measure of the first power grant to the second power grant rather than to provide the measure of the first power grant to the first printing device heater system if a print substance density is within a selected print substance density threshold and the first load request is within a selected load threshold.