Current regulator for multimode operation of solid state lighting
First Claim
1. A current regulator for providing a plurality of operating modes for solid state lighting, the current regulator couplable to a DC power supply, the current regulator comprising:
- a memory to store a plurality of average current parameters; and
a control circuit coupled to the memory, the control circuit to modulate an energizing cycle time period (“
T”
) for providing power to the solid state lighting in response to a selected average current parameter (“
a”
) of the plurality of average current parameters by determining the energizing cycle time period as proportional to the product of the selected average current parameter and a reset time period (“
TR”
) for an inductor current to return to a substantially zero level from a predetermined peak level (T∝
a·
TR).
3 Assignments
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Accused Products
Abstract
An exemplary apparatus embodiment provides a plurality of operating modes for solid state lighting, such as a flash mode and a constant or background lighting mode for use with devices such as cameras. An exemplary apparatus comprises a memory adapted to store a plurality of average current parameters; and a controller adapted to modulate an energizing cycle time period (“T”) for providing power to the solid state lighting as proportional to the product of the selected average current parameter (“a”) and a reset time period (“TR”) for an inductor current to return to a substantially zero level from a predetermined peak level (T∝a·TR). The average current parameter is predetermined as substantially proportional to a ratio of a peak inductor current level (“IP”) to an average output D.C. current level
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Citations
22 Claims
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1. A current regulator for providing a plurality of operating modes for solid state lighting, the current regulator couplable to a DC power supply, the current regulator comprising:
-
a memory to store a plurality of average current parameters; and a control circuit coupled to the memory, the control circuit to modulate an energizing cycle time period (“
T”
) for providing power to the solid state lighting in response to a selected average current parameter (“
a”
) of the plurality of average current parameters by determining the energizing cycle time period as proportional to the product of the selected average current parameter and a reset time period (“
TR”
) for an inductor current to return to a substantially zero level from a predetermined peak level (T∝
a·
TR). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for providing a plurality of operating modes for solid state lighting, the apparatus comprising:
-
a memory to store a plurality of average current parameters; and a controller coupled to the memory, the controller to modulate an energizing cycle time period (“
T”
) for providing power to the solid state lighting in response to a selected average current parameter (“
a”
) of the plurality of average current parameters by determining the energizing cycle time period as proportional to the product of the selected average current parameter and a reset time period (“
TR”
) for an inductor current to return to a substantially zero level from a predetermined peak level (T∝
a·
TR). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A current regulator for providing a plurality of operating modes for solid state lighting, the current regulator couplable to a DC power supply, the current regulator comprising:
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an inductor coupled to the DC power supply and coupled to the solid state lighting; a switch coupled to the inductor; a current sensor coupled to the switch; a first comparator coupled to the current sensor; a voltage sensor coupled to the inductor; a second comparator coupled to the voltage sensor; a memory to store a plurality of average current parameters; and a control circuit coupled to the memory and to the first and second comparators, the control circuit to turn the switch on to commence an energizing cycle and to turn the switch off when the first comparator indicates that an inductor current has reached a predetermined peak level, to determine a reset time period when the second comparator indicates that a voltage level corresponding to the inductor current has decreased substantially to a zero level, and to determine an energizing cycle time period for providing power to the solid state lighting as proportional to a selected average current parameter of the plurality of average current parameters and the reset time period.
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Specification