Maintaining power through a data transmission cable
AssigneeTexas Instruments Incorporated, a Delaware corporation
InventorsRiazdeen Buhari, Martin H. Patoka
Life of this patent
Estimating the term…
Abstract
A powered device receives electrical power through a data transmission cable from a power supplying device that monitors a load on the data transmission cable and turns off the power to the load if the load is outside of a range. The powered device draws a first current at least part of a time during which the powered device is in a low power mode. The powered device is operable during the low power mode to draw a second current. And the powered device increases and decreases the second current to maintain a sum of the first current and the second current, or a level of a current into the powered device, at least at a minimum level for at least a portion of a cycle time.
Claims20
A method of causing power to be maintained to a powered device during a low power mode of the powered device, comprising:
- receiving electrical power by the powered device through a data transmission cable from a power sourcing device that monitors a load on the data transmission cable and turns off the power to the load if the load is outside of a range;
- reducing a first current to put the powered device in the low power mode;
- and
- maintaining a level of a current into the powered device at least at a minimum level for at least a portion of a cycle time by changing a second current in response to a monitored current value being different from a reference value, the current into the powered device being a sum of the first and second currents.
A powered device that receives electrical power through a data transmission cable from a power supplying device that monitors a load on the data transmission cable and turns off the power to the load if the load is outside of a range, comprising:
- at least one first electronic component that draws a first current at least part of a time during which the powered device is in a low power mode;
- a second electronic component operable during the low power mode to draw a second current;
- and
- a current control circuit connected to the second electronic component to control the second electronic component to increase and decrease the second current to maintain a sum of the first current and the second current at least at a minimum level for at least a portion of a cycle time.
A powered device that receives electrical power through a data transmission cable from a power sourcing device, comprising:
- a means for drawing a first current during a low power mode;
- a means for drawing a second current during the low power mode, a sum of the first current and the second current being a total current drawn by the powered device;
- a means for generating a monitored current value based on a level of the total current;
- and
- a means for turning off and on the means for drawing the second current in response to the monitored current value being above or below a reference value to maintain the level of the total current at least at a minimum value for at least a portion of a cycle time while the powered device is in the low power mode.
Dependencies are inferred from the claim text.