Dynamic-headroom LED power supply
AssigneeCRS Electronics
InventorScott Riesebosch
Life of this patent
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Abstract
A voltage level supplied to power a plurality of LED light fixtures is dynamically adjusted to control the headroom of the voltage level. The current drawn by at least one of the plurality of LED light fixtures is monitored, and the voltage is increased from zero until the monitored current reaches its maximum.
Claims28
A method for dynamically controlling headroom of a voltage supplied to a plurality of LED light fixtures, the method comprising:
- supplying an adjustable voltage to the plurality of LED light fixtures;
- increasing the voltage from zero;
- monitoring a current drawn by at least one of the plurality of LED light fixtures;
- and
- ceasing increasing the voltage when the current reaches a maximum value,
- wherein the monitored current is drawn by all of the plurality of LED light fixtures and wherein the current is monitored at a location remote to each of the plurality of LED light fixtures.
A system for dynamically controlling headroom of a voltage supplied to a plurality of LED light fixtures, the system comprising:
- an adjustable AC/DC power supply for supplying an adjustable DC voltage to a power bus connected to the plurality of LED light fixtures;
- a sensing circuit for monitoring a current of at least one of the plurality of LED light fixtures;
- a control circuit for adjusting the DC voltage in accordance with an output of the sensor,
- wherein the sensing circuit comprises a current sensor for detecting a maximum current drawn by all of the LED light fixtures and wherein the current sensor is disposed at a location remote to each of the plurality of LED light fixtures.
A system for dynamically controlling headroom of a voltage supplied to a plurality of LED light fixtures, the system comprising:
- an adjustable AC/DC power supply for supplying an adjustable DC voltage to a power bus connected to the plurality of LED light fixtures;
- a control circuit for inducing small changes to the DC voltage on the power bus;
- and
- a sensing circuit for measuring correspondingly induced changes in a current of at least one of the plurality of LED light fixtures,
- wherein the control circuit compares the changes to the DC voltage to the induced changes in the current, thereby determining an operating point of the system, and wherein the control circuit adjusts the DC voltage, if necessary, to position the system at a desired operating point.
Dependencies are inferred from the claim text.