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US 2011/0215728 A1Published application
Constant power led circuit
AssigneeSwitch Bulb Company, Inc.
InventorRonald J. Lenk
Life of this patent
Estimating the term…
Abstract
A constant power drive for light emitting diodes, such that there is automatic compensation for variation in forward voltage of the LED, both in a single unit with temperature, and also due to unit-to-unit variations.
Claims10
A constant power LED drive circuit comprising:
- a switch-mode power supply;
- a current sensor providing a signal proportional to an LED current;
- and
- an integrator taking the signal from the current sensor and combining it with a signal proportional to the duty cycle and forming an output, which determines a relative amount of time for a transistor switch in an on configuration and an off configuration.
1 more element
Dependencies are inferred from the claim text.