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US 7,573,206 B2Granted
Perceptible flickering reduction
AssigneeHewlett-Packard Development Company, L.P.
InventorsPeter C. Nicholson, David E. Smith, Kenneth B. Wade
Life of this patent
Estimating the term…
Abstract
A system includes a load, one or more switches, and a controller. The switches are to switch power received from a power source to power the load. The controller is to control switching of the switches to deliver the power to the load to reduce perceptible flickering of one or more lights coupled to the power source.
Claims15
A system comprising:
- a load;
- one or more switches to switch power received from a power source to power the load;
- and,
- a controller to control switching of the switches to deliver the power to the load to reduce perceptible flickering of one or more lights coupled to the power source,
- wherein the controller is to control switching of the switches to deliver power to the load based on a preconstructed profile specifying flicker perceptibility as a function of percentage of power available from the power source as deliverable to the load, and
- wherein the preconstructed profile includes a plurality of nulls at which the flicker perceptibility is at least at a local minimum, each null corresponding to a specific percentage of power available from the power source as deliverable to the load.
3 more elements
A power-providing subsystem for an electronic device having an electrical load, comprising:
- one or more switches to switch power received from alternating-current (AC) mains to power the electrical load;
- and,
- a controller to control switching of the switches to deliver power to the electrical load, based on a preconstructed profile specifying flicker perceptibility as a function of percentage of power available from the AC mains as deliverable to the electrical load, such that perceptible flickering of one or more lights outside of the electronic device and also powered by the AC mains is reduced,
- wherein each of the switches is to switch the power received from the AC mains to power the electrical load at zero-crossing points of a sine wave of the power received from the AC mains.
1 more element
A method comprising:
- receiving a signal representing a first amount of power to be provided to an electrical load, from the electrical load;
- determining a second amount of power to deliver to the electrical load, based on the first amount of power to be provided to the electrical load, to reduce perceptible flickering of one or more lights powered by a power source is reduced;
- and,
- causing one or more switches to switch power received from the power source to deliver the second amount of power to the electrical load,
- wherein determining the second amount of power to deliver to the electrical load comprises determining the second amount of power based on a preconstructed profile specifying flicker perceptibility as a function of percentage of power available from AC mains as deliverable to the electrical load, the preconstructed profile including a plurality of nulls at which the flicker perceptibility is at least at a local minimum, each null corresponding to a specific percentage of power available from the AC mains as deliverable to the electrical load.
2 more elements
Dependencies are inferred from the claim text.