Methods and apparatus for controlling respective load currents of multiple series-connected loads
Abstract
A lighting apparatus (100) includes one or more first LEDs (202) for generating a first spectrum of radiation (503), and one or more second LEDs (204) for generating a second different spectrum radiation (505). The first and second LEDs are electrically connected in series between a first node (516A) and a second node (516B), between which a series current (550) flows with the application of an operating voltage (516) across the nodes. A controllable current path (518) is connected in parallel with one or both of the first and second LEDs so as to at least partially divert the series current, such that a first current (552) through the first LED(s) and a second current (554) through the second LED(s) are different. Such current diversion techniques may be employed to compensate for shifts in color or color temperature of generated light during thermal transients, due to different temperature-dependent current-to-flux relationships for different types of LEDs.
- Inventors:
- Issue Date:
- Research Org.:
- Philips Color Kinetics Inc., Burlington, MA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1132607
- Patent Number(s):
- 8736197
- Application Number:
- 12/681,631
- Assignee:
- Koninklijke Philips N.V. (Eindhoven, NL)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F21 - LIGHTING F21K - NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES
- DOE Contract Number:
- FC26-06NT42932
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2008 Oct 08
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Datta, Michael, and Lys, Ihor. Methods and apparatus for controlling respective load currents of multiple series-connected loads. United States: N. p., 2014.
Web.
Datta, Michael, & Lys, Ihor. Methods and apparatus for controlling respective load currents of multiple series-connected loads. United States.
Datta, Michael, and Lys, Ihor. Tue .
"Methods and apparatus for controlling respective load currents of multiple series-connected loads". United States. https://www.osti.gov/servlets/purl/1132607.
@article{osti_1132607,
title = {Methods and apparatus for controlling respective load currents of multiple series-connected loads},
author = {Datta, Michael and Lys, Ihor},
abstractNote = {A lighting apparatus (100) includes one or more first LEDs (202) for generating a first spectrum of radiation (503), and one or more second LEDs (204) for generating a second different spectrum radiation (505). The first and second LEDs are electrically connected in series between a first node (516A) and a second node (516B), between which a series current (550) flows with the application of an operating voltage (516) across the nodes. A controllable current path (518) is connected in parallel with one or both of the first and second LEDs so as to at least partially divert the series current, such that a first current (552) through the first LED(s) and a second current (554) through the second LED(s) are different. Such current diversion techniques may be employed to compensate for shifts in color or color temperature of generated light during thermal transients, due to different temperature-dependent current-to-flux relationships for different types of LEDs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {5}
}
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