LED power control methods and apparatus
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First Claim
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1. An apparatus comprising:
- at least one first white LED configured to generate first radiation having a first spectrum that includes perceivably white light; and
a first feed-forward driver coupled to the at least one first white LED and configured to controllably vary a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED,wherein the first feed-forward driver comprises an energy transfer arrangement including;
at least one energy transfer element to store input energy derived from a power source and to provide output energy to the at least one first white LED;
at least one switch coupled to the at least one energy transfer element to control at least the input energy stored to the at least one energy transfer element; and
at least one diode,wherein the energy transfer arrangement is configured as one of a buck converter, a boost converter, a buck-boost converter, a CUK converter, a flyback converter and a forward converter.
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Abstract
Methods and apparatus for providing and controlling power to loads including one or more LEDs. In one example, a controlled predetermined power is provided to a load without requiring any feedback information from the load (i.e., without monitoring a load voltage and/or load current). In another example, a “feed-forward” power driver for an LED-based light source combines the functionality of a DC-DC converter and a light source controller, and is configured to control the intensity of light generated by the light source based on modulating the average power delivered to the light source in a given time period, without monitoring and/or regulating the voltage or current provided to the light source. In various examples, significantly streamlined circuits having fewer components, higher overall power efficiencies, and smaller space requirements are realized. Based on various power driver configurations, lighting apparatus incorporating one or more power drivers for one or more LED-based loads may be implemented, and multiple such lighting apparatus may be coupled together to form a lighting network in which operating power is efficiently provided throughout the network.
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Citations
37 Claims
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1. An apparatus comprising:
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at least one first white LED configured to generate first radiation having a first spectrum that includes perceivably white light; and a first feed-forward driver coupled to the at least one first white LED and configured to controllably vary a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED, wherein the first feed-forward driver comprises an energy transfer arrangement including; at least one energy transfer element to store input energy derived from a power source and to provide output energy to the at least one first white LED; at least one switch coupled to the at least one energy transfer element to control at least the input energy stored to the at least one energy transfer element; and at least one diode, wherein the energy transfer arrangement is configured as one of a buck converter, a boost converter, a buck-boost converter, a CUK converter, a flyback converter and a forward converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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at least one first white LED configured to generate first radiation having a first spectrum that includes perceivably white light; a first feed-forward driver coupled to the at least one first white LED and configured to controllably vary a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED; at least one second LED configured to generate second radiation having a second spectrum different from the first spectrum; and a second feed-forward driver coupled to the at least one second LED and configured to controllably vary a second intensity of the second radiation without monitoring or regulating a second voltage or a second current provided to the at least one second LED. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method comprising acts of:
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A) generating first radiation having a first spectrum that includes perceivably white light from at least one first white LED; and B) controllably varying a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED, wherein the act B) comprises acts of; storing input energy derived from a power source to at least one energy transfer element; providing output energy from the at least one energy transfer element to the at least one first white LED; and controlling at least the input energy stored to the at least one energy transfer element via at least one switch coupled to the at least one energy transfer element, wherein the at least one energy transfer element and the at least one switch form part of an energy transfer arrangement that includes the at least one energy transfer element, the at least one switch, and at least one diode, and wherein the energy transfer arrangement is configured as one of a buck converter, a boost converter, a buck-boost converter, a CUK converter, a flyback converter and a forward converter. - View Dependent Claims (26, 27, 28)
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29. A method comprising acts of:
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A) generating first radiation having a first spectrum that includes perceivably white light from at least one first white LED; B) controllably varying a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED; C) generating second radiation having a second spectrum, different from the first spectrum, from at least one second LED; and D) controllably varying a second intensity of the second radiation without monitoring or regulating a second voltage or a second current provided to the at least one second LED. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification
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Litigation Data
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Current AssigneeSignify North America Corporation (Signify N.V.)
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Original AssigneePhilips Solid-State Lighting Solutions (Koninklijke Philips N.V.)
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InventorsLys, Ihor A.
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Primary Examiner(s)Owens; Douglas W
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Assistant Examiner(s)Le; Tung X
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Application NumberUS11/780,574Publication NumberTime in Patent Office1,061 DaysField of Search315/209.R, 315/224, 315/291, 315/307, 315/308, 315/362, 345 82- 83, 362/227, 362230-231, 362/611, 362/612, 362/800US Class Current315/291CPC Class CodesH02M 1/0012 Control circuits using digi...H02M 1/0019 the disturbance parameters ...H02M 1/008 Plural converter units for ...H02M 1/4225 using a non-isolated boost ...H02M 1/425 using a single converter st...H02M 1/4291 by using a Buck converter t...H02M 3/155 using semiconductor devices...H02M 3/156 with automatic control of o...H02M 3/157 with digital controlH02M 3/33561 having more than one ouput ...H05B 45/10 Controlling the intensity o...H05B 45/14 using electrical feedback f...H05B 45/24 using electrical feedback f...H05B 45/305 Frequency-control circuitsH05B 45/355 Power factor correction [PF...H05B 45/3725 Switched mode power supply ...H05B 45/375 using buck topologyH05B 45/38 using boost topologyH05B 45/385 using flyback topologyY02B 70/10 Technologies improving the ...
