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US 2013/0154490 A1Published application
Current routing to multiple led circuits
AssigneeXicato, Inc.
InventorGerard Harbers
Life of this patent
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Abstract
An illumination module includes a plurality of Light Emitting Diodes (LEDs) located in different zones to preferentially illuminate different color converting surfaces. The flux emitted from LEDs located in different zones may be independently controlled by selectively routing current from a single current source to different strings of LEDs in the different zones. In this manner, changes in the CCT of light emitted from LED based illumination module may be achieved.
Claims20
An LED based illumination device, comprising:
- a first LED string comprising a first plurality of LEDs coupled in series, wherein a current supplied to the first LED string causes a light emission from the LED based illumination device with a first Correlated Color Temperature (CCT);
- a second LED string comprising a second plurality of LEDs coupled in series, wherein the current supplied to the second LED string causes a light emission from the LED based illumination device with a second CCT;
- and
- a current router comprising,
- a first node coupled to a current source, the current router operable to receive a current signal on the first node,
- a second node coupled to the first LED string,
- a third node coupled to the second LED string, the current router operable to selectively route a first portion of the current signal to the first LED string over the second node and a second portion of the current signal to the second LED string over the third node based on a property of the current signal.
4 more elements
An apparatus comprising:
- a current source having a power input node, a color command input node, and a power output node, wherein the current source is operable to change a property of a current signal selected from a group consisting of switching frequency, duty cycle, and amplitude, generated by the current source on the output node based on a color command input signal on the color command input node;
- a current router having an input node, a first output node, and a second output node, the input node of the current router coupled to the power output node of the current source;
- a first plurality of LEDs coupled in series between the first output node of the current router and the power input node of the current source;
- and
- a second plurality of LEDs coupled in series between the second output node of the current router and the power input node of the current source.
2 more elements
A current router, comprising:
- a first node couplable to a single channel of a current source, wherein the current source is a switching power supply operable at a plurality of switching frequencies;
- a second node couplable to a first LED string including a first plurality of LEDs coupled in series;
- and
- a third node couplable to a second LED string including a second plurality of LEDs coupled in series, wherein a current signal received by the current router over the first node is selectively routed to each of the first string of LEDs and the second string of LEDs based on a a property selected from a group consisting of switching frequency, duty cycle, and amplitude of the switching power supply.
1 more element
A method comprising:
- receiving a switched current signal having a property selected from a group consisting of switching frequency, duty cycle, and amplitude;
- and
- selectively routing a first portion of the switched current signal to a first plurality of LEDs coupled in series and a second portion of the switched current signal to a second plurality of LEDs coupled in series based on the property.
Dependencies are inferred from the claim text.