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US 9,769,895 B2Granted
Light emitting diode (LED) warm on dim circuit
AssigneeLuxTech, LLC
InventorRonald J. Lenk
Life of this patent
Estimating the term…
Abstract
A method and circuit to use light-emitting diodes to emulate the dimming performance of incandescent lighting, and more particularly, to making a circuit that uses only white and deep red light-emitting diodes to achieve a coordinated-color-temperature as a function of dim level that is close to that of an incandescent light being similarly dimmed.
Claims18
A light emitting diode (LED) dimmer circuit, comprising:
- at least one white LED;
- a first controllable current source coupled to the at least one white LED;
- at least one deep red LED;
- a second controllable current source coupled to the at least one deep red LED;
- and
- a control system configured to control said first controllable current source to produce a current that increases linearly as a dimming level increases, and configured to control said second controllable current source to produce a current that increases linearly as the dimming level increases, the dimming level having a maximum level.
3 more elements
A method, comprising:
- controlling a first controllable current source coupled to at least one white light emitting diode (LED) to produce a current that increases linearly as a dimming level increases;
- and
- controlling a second controllable current source coupled to at least one deep red LED to produce a current that increases linearly as the dimming level increases, the dimming level having a maximum level.
An apparatus, comprising:
- a first controllable current source configured to be operatively coupled to at least one white light emitting diode (LED), the first controllable current source configured to produce for the at least one white LED a current that increases linearly as a dimming level increases;
- and
- a second controllable current source operatively coupled to at least one red LED, the second controllable current source configured to produce for the at least one red LED a current that increases linearly as the dimming level increases.
Dependencies are inferred from the claim text.