Lighting system with power factor correction control data determined from a phase modulated signal
DCFirst Claim
1. A light emitting diode (LED) lighting system comprising:
- a power factor correction (PFC) controller comprising;
an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal; and
a digital signal processor, coupled to the input, to receive the phase delay signal and determine a PFC control operating parameter from the phase delay signal and to generate a PFC switch control signal using the determined operating parameter.
4 Assignments
Litigations
0 Petitions
Accused Products
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 bit 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.
265 Citations
32 Claims
-
1. A light emitting diode (LED) lighting system comprising:
a power factor correction (PFC) controller comprising; an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal; and a digital signal processor, coupled to the input, to receive the phase delay signal and determine a PFC control operating parameter from the phase delay signal and to generate a PFC switch control signal using the determined operating parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. 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 PFC control operating parameter from the phase delay signal using a digital signal processor; and generating a PFC switch control signal using the determined operating parameter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A light emitting diode (LED) lighting system comprising:
a power factor correction (PFC) controller to receive a signal indicating a dimming level and to generate a PFC switch control signal to cause a PFC LED driver circuit to respond to the dimming level indicated by the signal without decreasing an effective resistance of the PFC load driver circuit, as perceived by a voltage source of the PFC load driver circuit, as the dimming level indicated by the signal increases. - View Dependent Claims (20, 21)
-
22. A method of controlling a light emitting diode (LED) lighting system, the method comprising:
-
receiving a signal indicating a dimming level; and generating a power factor correction control signal to cause a PFC LED driver circuit to respond to the dimming level indicated by the signal without decreasing an effective resistance of the PFC load driver circuit, as perceived by a voltage source of the PFC load driver circuit, as the dimming level indicated by the signal increases. - View Dependent Claims (23, 24)
-
-
25. A light emitting diode (LED) lighting system comprising:
a power factor correction (PFC) controller to generate a duty cycle modulated control signal to control a regulated link voltage of a PFC LED driver circuit and to decrease the link voltage when a duty cycle of the control signal decreases to a value between zero and a duty cycle threshold value. - View Dependent Claims (26, 27)
-
28. A method of controlling a light emitting diode (LED) lighting system, the method comprising:
-
generating a duty cycle modulated control signal to control a regulated link voltage of a PFC LED driver circuit; and decreasing the link voltage when a duty cycle of the control signal decreases to a value between zero and a duty cycle threshold value. - View Dependent Claims (29, 30)
-
-
31. A light emitting diode (LED) lighting system comprising:
a power factor correction (PFC) controller comprising; an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal; and wherein the PFC controller is configured to receive the phase delay signal and to generate pulses for the PFC switch control signal during the phase delays of the phase modulated signal, wherein the pulse widths and duty cycles of the pulses of the PFC switch control signal generated during the phase delays are sufficient to attenuate ripple of the phase modulated signal during the phase delays of phase modulated signal.
-
32. 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; generating pulses for a PFC switch control signal during the phase delays of the phase modulated signal, wherein the pulse widths and duty cycles of the pulses of the PFC switch control signal generated during the phase delays are sufficient to attenuate ripple of the phase modulated signal during the phase delays of phase modulated signal.
-
Specification