Abstract: A zero-crossing detection circuit coupled to a power factor correction (PFC) controller of a power supply system includes a zener diode configured to generate a zener reference signal, and an operational amplifier coupled to the zener diode and configured to receive the zener reference signal and a feedback signal corresponding to an output current of the power supply system, and to generate a zero-crossing signal to a zero-crossing input of the PFC controller.

Abstract: A power supply system includes a rectifier configured to rectify an input signal to generate a rectified signal having a single polarity, a converter configured to generate a drive signal for powering a light source, and a ripple control system including a voltage-controlled resistor (VCR) coupled to a secondary-side of the converter and configured to dynamically adjust a resistance of the VCR to compensate for ripples in the drive signal.

Abstract: A method of controlling a power supply electrically coupled to a dimmer includes receiving a current pulse-width-modulated (PWM) pulse of a plurality of PWM pulses corresponding to a dimmer level, calculating a current duty cycle of the current PWM pulse, comparing the current duty cycle with a window of validity to determine whether the current duty cycle is within the window of validity, and in response to determining that the current duty cycle is not within the window of validity, determining whether a count of out-of-range PWM pulses having duty cycles not within the window of validity is greater than a threshold, and in response to determining that the count of out-of-range PWM pulses is greater than the threshold generating a sample value corresponding to the current duty cycle for transmission to the power supply.

Abstract: An active gain control circuit includes a voltage divider having a variable resistance configured to attenuate a rectified input line voltage to produce a reference signal, a filter circuit configured to extract a DC-level reference voltage from the reference signal, and an operational amplifier configured to receive the DC-level reference voltage and a comparison voltage, and to generate a gate control signal based on a difference between the comparison voltage and the DC-level reference voltage, wherein a resistance of the voltage divider is controlled by the gate control signal.

Abstract: A power supply system includes a converter configured to generate a drive signal based on a rectified input signal for powering a light source, a ripple control system including a voltage-controlled resistor (VCR) coupled to a secondary-side of the converter and configured to dynamically adjust a resistance of the VCR to compensate for ripples in the drive signal, and a controller configured to sense an output voltage of the converter, to calculate a voltage drop across the VCR, and to generate a feedback signal to control the drive signal of the converter based on the sensed output voltage and the calculated voltage drop.

Abstract: According to some embodiments of the present disclosure, there is provided a method of controlling a power supply electrically coupled to a dimmer, the method including receiving a current sample value of a plurality of sample values corresponding to dimmer levels, determining a dynamic weight based on the current sample value, filtering the plurality of sample values based on the dynamic weight to generate a plurality of filtered values, and generating a control signal based on the filtered values for transmission to the power supply.

Abstract: A power supply system for driving a light source includes a transformer including a primary winding and a plurality of secondary windings including an output bias winding, a control bias winding, and an RF bias winding, the output bias winding being electrically coupled to and configured to supply electrical power to the light source, a control circuit electrically coupled to and configured to receive electrical power from the control bias winding; and an RF communication circuit electrically coupled to and configured to receive electrical power from the RF bias winding.

Abstract: A method of controlling a power supply electrically coupled to a dimmer includes receiving a current sample value of a plurality of sample values corresponding to dimmer levels, determining whether there is a change in the dimmer levels, determining a dynamic weight of the current sample value based on the determining whether there is a change in the dimmer levels, filtering the plurality of sample values based on the dynamic weight to generate a plurality of filtered values, and generating a control signal based on the filtered values for transmission to the power supply.

Abstract: A hot-pluggable barrel jack connection system includes a male barrel jack connector including a tip connector at a distal end of the male barrel jack connector and configured to conduct a ground reference voltage, a first ring connector electrically isolated from the tip connector by a first insulator, and configured to conduct a first data signal, and a sleeve connector adjacent to a base of the male barrel jack connector electrically isolated from the first ring connector, and configured to conduct a power signal.

Abstract: A method of controlling a power supply in a multi-input power supply system includes retrieving a prior input state flag from a memory of the multi-input power supply system, determining a first dimmer input of the multi-input power supply system based on the prior input state flag, determining whether the first dimmer input is currently valid, and in response to determining that the first dimmer input is not valid, determining whether a second dimmer input of the multi-input power supply system is currently valid, and in response to determining that the second dimmer input is valid, controlling the power supply based on a second input signal received through the second dimmer input.

Abstract: A method of controlling a power supply electrically coupled to a dimmer and a light source includes receiving a plurality of sample values corresponding to dimmer levels, comparing a sample value of the plurality of sample values with one or more inflection points, the one or more inflection points being associated with a plurality of slew-rates, identifying a particular slew-rate among the plurality of slew-rates based on the comparison, and generating a control signal based on the particular slew-rate for transmission to the power supply.

Abstract: An active preload circuit includes: a rectifier configured to receive an AC input from a TRIAC dimmer and to generate DC power; a preload; and a phase angle controller configured to selectively couple the preload to the DC power.

Abstract: A touch sensor for controlling intensity of lighting electrically connected thereto, the touch sensor including a touch sensor interface for detecting a touch of a user, a power supply connected to the touch sensor for controlling the intensity of the lighting, and a backlight behind the touch sensor interface, and including a plurality of light sources for illuminating different portions of the touch sensor interface.

Abstract: An LED driver includes a power input configured to receive an input power; a dimmer switch input configured to receive a brightness input; and a power supply coupled to the power input and the dimmer switch input, the power supply having a plurality of selectable transfer functions and a currently selected transfer function of the plurality of selectable transfer functions, the power supply being configured to generate an output power from the input power, the output power having a level based on a value of the brightness input and the currently selected transfer function.

Abstract: A method of monitoring a power factor correcting (PFC) power supply is provided. The method includes: powering on the PFC power supply with a constant current; starting a runtime counter that increments a count value; measuring an output voltage; calculating an output power by multiplying the constant current by the output voltage; storing the output power in a random-access memory (RAM); calculating an input power by multiplying the output power by an efficiency curve factor; and storing the input power in the RAM.

Abstract: A dual stage power converter capable of being installing in a one-gang box and powering an LED load is presented. The dual stage converter includes a power factor correction (PFC) stage operating in transition mode and a resonant converter stage operating at a fixed frequency with a fixed duty cycle and dead time. A dimmer input is included to select a desired luminosity of the LED load. A main controller adjusts the value of the voltage output from the PFC stage in order to maintain the voltage output from the resonant stage at the desired level.