Temperature controller for a fusing roller
AssigneeGeneral Electric Company
InventorJohn A. Popelish
Life of this patent
Estimating the term…
Abstract
Apparatus for controlling the cycles of AC power supplied to a variable thermal load in response to analog signals representing the temperature of the load comprising means for quantizing the analog signals into digital signals and controlling the proportion of integral cycles of AC current blocked to those supplied to said load, while providing a uniform spacing in time of the integral cycles supplied, in accordance with said digital signals. Also means are provided for modifying said digital signals in response to a predetermined average current overload.
Claims8
An arrangement for controlling electrical current supplied from an AC source to a fusing roller in accordance with variable analog control signals representing the variations in temperature of the roller over a given range comprising means for digitizing said analog control signals to provide first control signals, means for controlling the proportion of integral cycles of alternating current from said source blocked to those supplied to said roller during a predetermined control period in which a substantial proportion of integral cycles of alternating current occur in accordance with said first control signals, means to provide a uniform spacing in time of the integral cycles supplied to said roller for all such proportions over said control period, means for indicating the average current consumed by said roller, means responsive to said indicated average current exceeding a predetermined level for providing second control signals, and means for modifying said first control signals in accordance with said second control signals.
An arrangement for controlling electrical current supplied from an AC source to a load in accordance with variable analog control signals representing variations in a characteristic of said load over a given range comprising means for digitizing said analog control signals to provide first digital control signals, means for controlling the proportion of integral cycles of alternating current from said source blocked to those supplied to said load during a predetermined control period in which a substantial proportion of integral cycles of alternating current occur in accordance with said first digital control signals, means to provide a uniform spacing in time of the integral cycles supplied to said load for all such proportions over said control period, means for indicating the average current consumed by said load, means responsive to said indicated average current exceeding a predetermined level for providing second digital control signals, and means for modifying said first digital control signals in accordance with said second digital control signals.
An arrangement for controlling electrical current supplied from an AC source to a fusing roller in accordance with variable analog control signals representing variations in the temperature of the roller over a given range comprising means for digitizing said analog control signals to provide first control signals, means for varying the proportion of integral full cycles of alternating current from said source blocked to those supplied to said roller in accordance with said first control signals during a predetermined control period in which a substantial proportion of integral full cycles of alternating current from said source occur, means for distributing the integral full cycles supplied to said roller evenly in time over said control period as the proportion of integral cycles of alternating current from said source blocked to those supplied to said roller is varied.
Dependencies are inferred from the claim text.