Digitally controlled current regulator for high power solid state lighting
First Claim
1. A current regulator for controlling current to solid state lighting, the current regulator couplable to a power source, the current regulator comprising:
- a memory to store a plurality of current parameters; and
a control circuit coupled to the memory, the control circuit to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters, wherein the plurality of current parameters comprise a predetermined minimum current level (IMIN) and a predetermined peak current level (IP), and wherein the DC average current level (IO) is substantially proportional to one-half of a sum of the predetermined peak current level (IP) and the predetermined minimum current level
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Accused Products
Abstract
An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (IMIN) parameter and a predetermined peak current level (IP) parameter, such that the DC average current level (IO) is substantially proportional to one-half of a sum of a predetermined peak current level (“IP”) and a predetermined minimum current level
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Citations
11 Claims
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1. A current regulator for controlling current to solid state lighting, the current regulator couplable to a power source, the current regulator comprising:
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a memory to store a plurality of current parameters; and a control circuit coupled to the memory, the control circuit to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters, wherein the plurality of current parameters comprise a predetermined minimum current level (IMIN) and a predetermined peak current level (IP), and wherein the DC average current level (IO) is substantially proportional to one-half of a sum of the predetermined peak current level (IP) and the predetermined minimum current level - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for controlling current to solid state lighting, the apparatus couplable to a power source, the apparatus comprising:
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a memory to store a predetermined minimum current level (IMIN) parameter and a predetermined peak current level (IP) parameter; and a controller coupled to the memory, the control circuit to provide a substantially constant DC average current to the solid state lighting by modulating a current provided to the solid state lighting in response to the predetermined minimum current level (IMIN) parameter and the predetermined peak current level (IP) parameter, wherein the DC average current level (IO) is substantially proportional to one-half of a sum of the predetermined peak current level (IP) and the predetermined minimum current level - View Dependent Claims (7, 8, 9, 10)
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11. A current regulator for providing substantially constant DC average current to solid state lighting, the current regulator couplable to a power source, the current regulator comprising:
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an inductor coupled to the power source and coupled to the solid state lighting; a switch coupled to the inductor or to the solid state lighting; a first current sensor coupled to the switch; a first comparator coupled to the first current sensor; a voltage sensor coupled to the switch; a second comparator coupled to the voltage sensor; a second current sensor in series with the inductor; a third comparator coupled to the second current sensor; a memory to store a plurality of current parameters; and a control circuit coupled to the memory and to the first, second and third comparators, the control circuit to turn the switch on to commence an energizing cycle when the second comparator or the third comparator indicate that an inductor current has reached a predetermined minimum level and to turn the switch off when the first comparator indicates that the inductor current has reached a predetermined peak level.
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Specification