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US 11,083,057 B2Granted
LED lighting driver and drive method
AssigneeSignify Holding B.V.
InventorsTheo Gerrit Zijlman, Bertrang Johan Edward Hontele, Henricus Marius Joseph Maria Kahlman, Hannah M. Yang
Life of this patent
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Abstract
An LED lighting driver has a switched mode power supply which generates an auxiliary power supply. The auxiliary power supply has a dummy load, and a control circuit for controlling the connection of the dummy load in parallel with the auxiliary load in dependence on the current drawn by the auxiliary load. In this way, a current drawn by the auxiliary load is made more stable so that effects of auxiliary supply fluctuations on the light output are reduced.
Claims15
An LED lighting driver comprising:
- a switched mode power supply having a main energy storage inductor for delivering energy to an LED lighting load;
- and
- an auxiliary power supply circuit comprising a power supply inductor magnetically coupled to the main energy storage inductor and a rectifier diode for delivering a rectified voltage to an auxiliary load,
- wherein the auxiliary power supply circuit comprises:
- the auxiliary load;
- a dummy load coupled in parallel with the auxiliary load;
- a control circuit for controlling the connection of the dummy load in parallel with the auxiliary load;
- and
- a current sense circuit for sensing a current drawn by the auxiliary load and controlling the control circuit in dependence on the current drawn such that a current drawn by the auxiliary load and the dummy load in combination is kept near constant.
6 more elements
An LED lighting method comprising:
- delivering energy to an LED lighting load using a switched mode power supply having a main energy storage inductor;
- generating an auxiliary power supply using a power supply inductor magnetically coupled to the main energy storage inductor and a rectifier diode, and supplying the auxiliary power supply to an auxiliary load;
- and
- controlling the connection of a dummy load in parallel with the auxiliary load in dependence on a current drawn by the auxiliary load such that a current drawn by the auxiliary load and the dummy load in combination is kept near constant.
1 more element
Dependencies are inferred from the claim text.