Led lighting driver and drive method
AssigneeSignify Holding B.V.
InventorsTheo Gerrit ZIJLMAN, Bertrand Johan Edward HONTELE, Marinus Joseph Maria KAHLMAN, Min YANG
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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 circuit has a first power supply inductor and a second power supply inductor in series with each other. The second power supply inductor is selectively switched into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the main energy storage inductor. The switching may be made 5 based on a light output mode or a standby mode being in operation. The standby mode then enables more efficient generation of an auxiliary supply voltage.
Claims14
An LED lighting driver having a light output mode and optionally a standby mode, the LED lighting driver comprising:
- an output for coupling to an LED lighting load;
- a switched mode power supply having an energy storage inductor for delivering energy to the LED lighting load;
- and
- an auxiliary power supply circuit comprising:
- a power supply inductor arrangement magnetically coupled to the energy storage inductor and comprising a first power supply inductor and a second power supply inductor,
- a rectifier diode arrangement for delivering a rectified voltage to an auxiliary load, and
- a switching circuit for selectively switching the second power supply inductor into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the energy storage inductor,
- the LED lighting driver further comprising:
- a controller for controlling the switching circuit in dependence on a desired lighting level, and
- a switchable preload at the output of the driver, wherein the switchable preload is reduced in a nominal operation.
An LED lighting driver, having a light output mode and optionally a standby mode, driving method comprising:
- delivering energy to an LED lighting load using a switched mode power supply having an energy storage inductor;
- generating an auxiliary power supply using an auxiliary power supply circuit having a first power supply inductor and a second power supply inductor in series with the first power supply inductor, magnetically coupled to the energy storage inductor, and a rectifier diode arrangement, and supplying an auxiliary power supply output voltage to an auxiliary load;
- and
- selectively switching the second power supply inductor into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the energy storage inductor.
Dependencies are inferred from the claim text.