METHODS AND APPARATUS FOR SIMULATING RESISTIVE LOADS
First Claim
1. An apparatus, comprising:
- at least one load having a nonlinear or variable current-to-voltage characteristic; and
a converter circuit coupled to the at least one load and configured such that the apparatus has a substantially linear current-to-voltage characteristic over at least some range of operation,wherein a first current conducted by the apparatus when the apparatus draws power from a power source is independent of a second current conducted by the load.
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Accused Products
Abstract
Methods and apparatus for simulating resistive loads, and facilitating series, parallel, and/or series-parallel connections of multiple loads to draw operating power. Current-to-voltage characteristics of loads are altered in a predetermined manner so as to facilitate a predictable and/or desirable behavior of multiple loads drawing power from a power source. Exemplary loads include LED-based light sources and LED-based lighting units. Altered current-to-voltage characteristics may cause a load to appear as a substantially linear or resistive element to the power source, at least over some operating range. In connections of multiple such loads, the voltage across each load is relatively more predictable. In one example, a series connection of multiple loads with altered current-to-voltage characteristics may be operated from a line voltage without requiring a transformer.
243 Citations
35 Claims
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1. An apparatus, comprising:
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at least one load having a nonlinear or variable current-to-voltage characteristic; and a converter circuit coupled to the at least one load and configured such that the apparatus has a substantially linear current-to-voltage characteristic over at least some range of operation, wherein a first current conducted by the apparatus when the apparatus draws power from a power source is independent of a second current conducted by the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus, comprising:
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at least one lighting unit having an operating voltage VL and an operating current IL, wherein a first current-to-voltage characteristic based on the operating voltage VL and the operating current IL is significantly nonlinear or variable; and a converter circuit coupled to the at least one lighting unit to provide the operating voltage VL, the converter circuit configured such that the apparatus conducts a terminal current IT and has a terminal voltage VT when the apparatus draws power from a power source, wherein; the operating voltage VL of the at least one lighting unit is less than the terminal voltage VT of the apparatus; the terminal current IT of the apparatus is independent of the operating current IL or the operating voltage VL of the at least one lighting unit; and a second current-to-voltage characteristic of the apparatus, based on the terminal voltage VT and the terminal current IT, is substantially linear over a range of terminal voltages near a nominal operating point VT=Vnom. - View Dependent Claims (28, 29, 30, 31)
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32. A method, comprising:
converting a nonlinear or variable current-to-voltage characteristic of at least one load to a substantially linear current-to-voltage characteristic, wherein the substantially linear current-to-voltage characteristic is independent of a current conducted by the load. - View Dependent Claims (33, 34, 35)
Specification