초록 ▼

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

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.

대표청구항 ▼

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

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.