Abstract: In one embodiment, a filter cleaning system and method pertain to, during a filter cleaning operation, reversing a flow direction of an inlet fan associated with a filter of the electrical device, the inlet fan being adapted to force air into a housing of the electrical device during normal operation of the electrical device, and reversing a flow direction of an outlet fan adapted to draw air out from the electrical device housing during normal operation of the electrical device so as to increase pressure within the electrical device housing during the filter cleaning operation, wherein the combined action of the reversed inlet fan and the reversed outlet fan purges particulate matter from the filter.

Abstract: Embodiments herein relate to controlling a connection to an interface. In an embodiment, a protection circuit is to detect a voltage at an input rail of a regulator, where the regulator is to provide power to a peripheral device via an interface. Next, the protection circuit is to compare the detected voltage to a reference voltage. Then, the protection circuit is to generate a detection signal based on the comparison. Lastly, the protection circuit is to disable a connection between the regulator and the interface based on the detection signal.

Abstract: Apparatus and a method of optimizing operating efficiency of multiple power supplies that are provided to power a system, the power supplies being selectively operable in an active or standby mode, said method comprising the steps of interconnecting at least some of the multiple power supplies in a load sharing configuration monitoring the output current of at least one of the interconnected power supplies selectively placing the interconnected power supplies in standby mode so that the active power supplies are operating at a relatively high efficiency.

Abstract: In one embodiment, a filter cleaning system and method pertain to, during a filter cleaning operation, reversing a flow direction of an inlet fan associated with a filter of the electrical device, the inlet fan being adapted to force air into a housing of the electrical device during normal operation of the electrical device, and reversing a flow direction of an outlet fan adapted to draw air out from the electrical device housing during normal operation of the electrical device so as to increase pressure within the electrical device housing during the filter cleaning operation, wherein the combined action of the reversed inlet fan and the reversed outlet fan purges particulate matter from the filter.

Abstract: A signal generator which generates an yoke signal for application to a horizontal yoke of a cathode ray tube (CRT) is presented. The signal generator receives a dc signal which indicates the width of the horizontal scan lines of the cathode ray tube and receives a pincushion correction signal. The signal generator includes a voltage source, a yoke current generator, a current feedback network, a summing circuit, an amplifier and a voltage regulator. The summing circuit sums the voltage of the dc signal and the pincushion correction signal. The current feedback network generates a first feedback signal with a first feedback signal voltage proportional to the peak value of current through the horizontal yoke. The amplifier generates a second feedback signal based on the difference in the voltage of the first feedback signal voltage and the summed voltage of the dc signal and the pincushion correction signal.

Abstract: A signal generator which generates an amplified yoke signal for application to a vertical yoke of a cathode ray tube monitor is presented. The signal generator includes a linear ramp generator and a correction generator. The linear ramp generator has an output on which is placed a ramp signal. The linear ramp generator also has a first input which receives a clock signal. The frequency of oscillation of the clock signal determines the frequency of oscillation of the ramp signal. The linear ramp generator additionally has a second input for receiving a height adjustment signal. The linear ramp generator varies the maximum voltage range of the ramp signal responsive to the height adjustment signal. The maximum voltage range is varied independent of the frequency of oscillation of the ramp signal. The correction generator receives the ramp signal from the linear ramp generator and generates an "S" correction signal.