DC-DC converter circuit configuration
AssigneeLumileds LLC
InventorZhi Hua Song
Life of this patent
Estimating the term…
Abstract
Systems, devices and methods are described herein. A device includes a power stage circuit, a switch and a first circuit. The switch is electrically coupled to the power stage circuit. The first circuit is electrically coupled to the power stage circuit and the switch and has a single output. The first circuit is configured to provide a first circuit output voltage at the single output. The first circuit output voltage has a first level on a condition that the power stage circuit is conducting at a peak current level. The first circuit output voltage has a second level on a condition that the power stage circuit is not conducting.
Claims21
A device comprising:
- a power stage circuit;
- a switch electrically coupled to the power stage circuit, the power stage circuit and the switch configured to provide a light emitting device (LED) drive current;
- and
- a first circuit electrically coupled to the power stage circuit and the switch and having a single output, the first circuit configured to provide a first circuit output voltage at the single output, the first circuit output voltage having a first level on a condition that the power stage is conducting at a peak current level and a second level on a condition that the power stage circuit is not conducting.
A system comprising:
- an electronics board comprising a light emitting device (LED) array and at least one DC-DC converter circuit, the at least one DC-DC converter circuit comprising:
- a power stage circuit electrically coupled to receive a DC voltage and supply a current to at least a subset of pixels in the LED array,
- a switch electrically coupled to the power stage circuit, and
- a circuit electrically coupled to the power stage circuit and the switch and having a single output, the circuit configured to provide a circuit output voltage at the single output, the circuit output voltage having a first level on a condition that the power stage is conducting at a peak current level and a second level on a condition that the power stage is not conducting.
A method of operating a light emitting diode (LED) driver, the method comprising:
- detecting a first voltage at a circuit node, the first voltage having a first level on a condition that a power stage circuit is conducting at a peak current level and a second level on a condition that the power stage circuit is not conducting;
- providing a second voltage to operate a switch, the second voltage switching the switch to an OFF state on a condition that the first voltage has the first level and switching the switch to an ON state on a condition that the first voltage has the second level;
- and
- supplying a direct current to a plurality of LED devices.
Dependencies are inferred from the claim text.