Lighting system with power factor correction control data determined from a phase modulated signal
AssigneeCirrus Logic, Inc.
InventorJohn L. Melanson
Life of this patent
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Abstract
A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays. are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal.
Claims25
A light emitting diode (LED) lighting system comprising:
- a controller comprising:
- an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal;
- and
- a signal processor, coupled to the input, to receive the phase delay signal and determine a control operating parameter from the phase delay signal and to generate a switch control signal using the determined operating parameter to vary an input current to a switching power converter with a phase modulated voltage.
A method of controlling a light emitting diode (LED) lighting system, the method comprising:
- receiving a phase delay signal indicating a phase delay of a phase modulated dimmer signal;
- determining a control operating parameter from the phase delay signal using a signal processor;
- and
- generating a switch control signal using the determined operating parameter to vary an input current to a switching power converter with a phase modulated voltage.
A light emitting diode (LED) lighting system comprising:
- a controller comprising:
- an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal;
- and
- a signal processor, coupled to the input, to receive the phase delay signal and determine a control operating parameter from the phase delay signal and to generate a switch control signal using the determined operating parameter to control an input current in response to one or more values of the phase delay signal.
An apparatus comprising:
- a switching power converter;
- a load coupled to the switching power converter, wherein the load includes one or more light emitting diodes;
- and
- a controller, coupled to the switching power converter, wherein the controller includes:
- an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal;
- and
- a signal processor, coupled to the input, to receive the phase delay signal and determine a control operating parameter from the phase delay signal and to generate a switch control signal using the determined operating parameter to vary an input current to a switching power converter with a phase modulated voltage.
An apparatus comprising:
- a switching power converter;
- a load coupled to the switching power converter, wherein the load includes one or more light emitting diodes;
- and
- a controller, coupled to the switching power converter, wherein the controller includes:
- an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal;
- and
- a signal processor, coupled to the input, to receive the phase delay signal and determine a control operating parameter from the phase delay signal and to generate a switch control signal using the determined operating parameter to vary an input current to a switching power converter with a phase modulated voltage.
Dependencies are inferred from the claim text.