A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.

Power control system for current regulated light sources

In at least one embodiment, a controller allows triac-based dimmer to properly function and dim a load whose voltage is regulated by a switching power converter. In at least one embodiment, the switching power converter includes a switch to control voltage conversion of an input voltage to the switching power converter, wherein phase delays are introduced in the input voltage by a triac-based dimmer during a dimming period. In at least one embodiment, the controller is configured to control the switch of the switching power converter to establish an input resistance of the switching power converter during a dimming portion of the input voltage, wherein the input resistance allows the triac-based dimmer to phase modulate a supply voltage to the dimmer so that an output voltage of the dimmer has a substantially uninterrupted phase delay during each half-cycle of the supply voltage during the dimming period.

Switching power converter control with triac-based leading edge dimmer compatibility

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.

Lighting system with power factor correction control data determined from a phase modulated signal

A system and method map dimming levels of a lighting dimmer to light source control signals using a predetermined lighting output function. The dimmer generates a dimmer output signal value. At any particular period of time, the dimmer output signal value represents one of multiple dimming levels. In at least one embodiment, the lighting output function maps the dimmer output signal value to a dimming value different than the dimming level represented by the dimmer output signal value. The lighting output function converts a dimmer output signal values corresponding to measured light levels to perception based light levels. A light source driver operates a light source in accordance with the predetermined lighting output function. The system and method can include a filter to modify at least a set of the dimmer output signal values prior to mapping the dimmer output signal values to a new dimming level.

Lighting System with Lighting Dimmer Output Mapping

A lighting system includes time division light output sensing and adjustment for ambient light. In at least one embodiment, time division light output sensing involves modulating power to a light emitting diode (LED) set, and the set of LEDs includes one or more LEDs. In at least one embodiment, each LED in the LED set is included in a single lamp, and, in at least one embodiment, the set of LEDs is contained in multiple lamps. In at least one embodiment, for each lamp, a controller modulates power to the LED set by selectively reducing power to the LED set using time division algorithm to allow a light sensor to sense the brightness of ambient light with a reduced contribution from the LED set. In at least one embodiment, a lighting system also includes time division light output sensing and adjustment for different spectra LEDs.

Light Emitting Diode Based Lighting System With Time Division Ambient Light Feedback Response

A multiphase DC/DC converter with voltage-mode hysteretic control and instantaneous current sharing functionality method and circuit. The disclosed method and circuit provides independent output voltage regulation and phases current regulation for the converter in two separate loops; one of which is concerned with voltage regulation preferably hysteretic regulation and the other which is concerned with phase current regulation. In one embodiment, each phase in the DC/DC converter is driven by a frequency divided signal derived directly from the output voltage ripple so that each phase has a switching frequency equal to the output voltage ripple frequency divided by the number of paralleled phase. In another embodiment, only the phase that carries the smallest current among a set of phases will be turned ON in each switching cycle to supply power to the output, avoiding multiple switching. Current sharing and regulation is achieved without shortening the ON time and with no multiple switching in any cycle.

/pdf/control-method-and-circuit-to-provide-voltage-and-current-241a0n4cy3.pdf

Control method and circuit to provide voltage and current regulation for multiphase DC/DC converters

A single-stage bi-flyback power factor correction topology is proposed in this paper. By adding a secondary winding to BIFRED choke inductor, there are two discharging paths for the choke inductor: to load or to intermediate capacitor. In this topology, the intermediate bus voltage is limited to below 400 VDC for universal voltage applications, and DC/DC conversion cell can operate in CCM. A 150 W prototype unit based on this topology has been built and tested in the lab with experimental results that show good performance.

A bi-flyback PFC converter with low intermediate bus voltage and tight output voltage regulation for universal input applications

An interleaving technique and hysteretic voltage control are suitable for low-voltage, high-current, fast-response power supplies. In this paper, a multiphase DC/DC power converter employing interleave and hysteretic control techniques and current sharing is proposed. The design considerations are discussed. Simulation and experimental results are reported.

A multiphase DC/DC converter with hysteretic voltage control and current sharing

Next-generation microprocessors need lower-voltage, faster-response and higher-power-density power supplies, and it's well known that the interleaving technique and hysteretic control are suitable for this task. In this paper, by combining the interleaving techniques and the hysteretic control method, an interleaved synchronous buck regulator is explored and proposed. The results suggest it has a promising future for low voltage application.

Interleaved synchronous buck regulator with hysteretic voltage control

A new innovative concept in AC/DC cell that transfers energy to the output side directly from the input line, rather than from the storage capacitor in power factor correction (PFC) cell during the period that the line voltage exceeds a preset value. The new concept is based on providing additional winding coupled to the DC/DC transformer connected to the rectified input side to provide a path for the energy transfer from the line to transfer to the output directly (Boost cell) or to be stored in the output transformer (Flyback cell).

/pdf/energy-transfer-concept-in-ac-dc-switch-mode-power-supply-2s9z4x5t5d.pdf

Energy transfer concept in AC/DC switch mode power supply with power factor correction

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