Abstract: A new linear power control topology coupled with simple control techniques are presented which virtually eliminate the flicker problem as well as providing excellent power quality over a wide range of power levels. A modified one dimensional LMS control system similar to the standard LMS algorithm with multiple operating points and gain scheduling is also described which when combined with the new power control topology yield a dramatic reduction in flicker while yielding a universal voltage interface for world wide use.

Abstract: A printer/copier apparatus is adapted to receive a replacement ink cartridge that is employed during the printing/copying operation. The apparatus includes a receptacle with a first connector that is coupled to a processor which controls operation of the apparatus. The cartridge includes a second connector which mates with the first connector and a serial access memory that is connected to the second connector. Data transfers are enabled both from and to the memory to enable access and modification of data stored therein that is indicative of cartridge usage, calibration, and to parameters for controlling operation of the apparatus. The invention is applicable to replaceable apparatus used with laser and ink jet printers, copiers, etc.

Abstract: In order to accomplish the present invention, there is provided a voltage supply system for use in a color electrophotographic printer where the electrophotographic printer has more than one developer. A high voltage AC source receives a select signal that indicates which one of the developers is presently in use. Provided one and only one developer is in use, the alternating current source outputs an AC voltage. A switching network is connected to the HVAC current source and also each developers. The switching network also receives the select signal and routes the AC voltage to the active developer. Stress to the switching elements in the switching network is reduce by proper sequencing of the application and removal of the HVAC and network reconfigurations.

Abstract: This invention relates to an improved laser printer power supply that maintains 24-, 12-, and 5 volt DC power to run exhaust fans for a brief period after the power switch is turned off. These fans remove undesirable ozone from the photo-conducting print drum so as to extend the life of the photo-conductor. The circuits utilize a timer circuit and an optically isolated photo-diac to turn a power triac on and off.

Abstract: A printer/copier apparatus is adapted to receive replacement parts that are subject to wear or which comprise a consumable that is employed during the printing/copying operation. The apparatus includes a first connector that is coupled to a processor which controls operation of the apparatus. A replaceable part includes a second connector which mates with the first connector. The replaceable part includes a serial access memory that is connected to the second connector by only a single wire. Data transfers are enabled both from and to the serial access memory to allow storage of data that is indicative of usage, calibration, or other data relating to the replaceable part. Usage of the single wire memory enables direct substitution of the serial access memory in place of a presently provided fuse, without requiring changes to the physical interface between the replaceable part and the connectors which enable mating of the replaceable part with the apparatus.