Abstract: Disclosed is an electrical dimmer that upon activation sends a forward-phase modulated test power pulse to a connected load, receives from the load a response pulse, compares the width of the two pulses, and, depending upon the results of the comparison, operates in either forward- or reverse-phase modulation. The dimmer may respond to an intensity target by setting a pulse-width modulation duty cycle, the setting based on an intensity-translation curve. The translation curve may be based on a mapping between luminance and human visual perception of brightness. Some dimmers support a minimum intensity setting, and some dimmers configure themselves to the frequency of the incoming alternating-current power source.

Abstract: Disclosed is an electrical dimmer that upon activation sends a forward-phase modulated test power pulse to a connected load, receives from the load a response pulse, compares the width of the two pulses, and, depending upon the results of the comparison, operates in either forward- or reverse-phase modulation. The dimmer may respond to an intensity target by setting a pulse-width modulation duty cycle, the setting based on an intensity-translation curve. The translation curve may be based on a mapping between luminance and human visual perception of brightness. Some dimmers support a minimum intensity setting, and some dimmers configure themselves to the frequency of the incoming alternating-current power source.

Abstract: A unique pattern arrangement, placement density, and wattage sizing of LEDs in a line voltage Linear Task Light produces uniform illumination with negligible point-source shadowing typically seen in other similar LED task lights. A desired energy code compliant 7½ Watts per foot is achieved using a greater number and smaller sized LEDs than in competitor's products, resulting in a better price-point efficiency in terms of dollars per Watt ($/W). The resulting product meets all Leed certification requirements, is California Title 24 compliant, and uses proximity sensing circuitry to further reduce energy consumption by shutting off when the illuminated area is vacant for a period of time. The LED Task Light disclosed is capable of higher illumination when needed, without sacrificing energy code compliancy through the use of timing circuitry to automatically reduce illumination intensity and corresponding energy consumption after a preset time interval.

Abstract: A unique pattern arrangement, placement density, and wattage sizing of LEDs in a line voltage Linear Task Light produces uniform illumination with negligible point-source shadowing typically seen in other similar LED task lights. A desired energy code compliant 7½ Watts per foot is achieved using a greater number and smaller sized LEDs than in competitor's products, resulting in a better price-point efficiency in terms of dollars per Watt ($/W). The resulting product meets all Leed certification requirements, is California Title 24 compliant, and uses proximity sensing circuitry to further reduce energy consumption by shutting off when the illuminated area is vacant for a period of time. The LED Task Light disclosed is capable of higher illumination when needed, without sacrificing energy code compliancy through the use of timing circuitry to automatically reduce illumination intensity and corresponding energy consumption after a preset time interval.

Abstract: A driver circuit produces variable current output for an LED lighting system providing improved dimming capability and greater power efficiency when responding to industry standard lighting dimmers through the use of an input voltage monitoring circuit which variably controls the current output of a switching regulator. Output current modulation methods such as analog, PWM, Pulse Frequency Modulation, or other digital modulation, and combination or hybrid may be employed. The current invention marries such output modulation techniques with a control method which is derived through intelligent monitoring of the input voltage waveform. The circuit and method described is adapted to higher current applications such as LED lighting systems using the latest high-power LEDs.

Abstract: A driver circuit produces variable current output for an LED lighting system providing improved dimming capability and greater power efficiency when responding to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of a switching regulator. Output current modulation methods such as analog, PWM, Pulse Frequency Modulation, or other digital modulation, and combination or hybrid methods such as that disclosed in U.S. Pat. No. 7,088,059 B2 may be employed. The current invention marries such output modulation techniques with a control method which is derived through intelligent monitoring of the input voltage waveform. The circuit and method described is adapted to higher current applications such as LED lighting systems using the latest high-power LEDs.

Abstract: A driver circuit produces variable current output for an LED lighting system providing improved dimming capability and greater power efficiency when responding to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of a switching regulator. Output current modulation methods such as analog, PWM, Pulse Frequency Modulation, or other digital modulation, and combination or hybrid methods may be employed. The current invention marries such output modulation techniques with a control method which is derived through intelligent monitoring of the input voltage waveform. The circuit and method described is adapted to higher current applications such as LED lighting systems using the latest high-power LEDs.

Abstract: A low voltage LED Lamp produces variable illumination in response to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of an integral driver in response to sensed changes in the input voltage. Input circuitry is employed to provide “ghost” loading in the case of high frequency voltage sources such as that provided by certain electronic ballasts requiring minimum loads to operate. Additionally, the capacitive nature of prior art LED driving circuits is altered, increasing power factor and further helping electronic ballasts run properly. A firmware algorithm adapts to the output voltage capability of the driving transformer, dynamically adjusting the illumination to achieve the best dimming curve suited to each transformer. The circuit employed drives high power LEDs, and the lamp is preferably adapted to fit common MR16 size fixtures. Illumination output equivalent to similar size halogen bulbs is achieved.

Abstract: A line voltage LED Lamp produces variable illumination in response to industry standard lighting dimmers, through the use of an input voltage monitoring circuit which variably controls the current output of an integral driver in response to sensed changes in the input voltage. A cascaded converter circuit is used to achieve a very high step-down ratio, enabling the LEDs to be driven from a high input voltage without the need for a power transformer. Electrolytic capacitors are avoided, increasing the life of the driver circuit in the high ambient temperatures typically encountered in the base of similar lamps. The circuit employed drives high power LEDs, and the lamp is adapted to fit common MR16 size fixtures. Illumination output equivalent to similar size halogen bulbs is achieved.

Abstract: A control/driver circuit produces variable current output for a lighting system providing improved dimming and color-mixing capability by allowing digital modulation control in addition to analog control over a range of illumination intensities. The circuit and method described is preferably adapted to higher current applications such as LED lighting systems using high-power LEDs. The output current of the circuit varies in proportion to the voltage level of an analog control signal, and additionally in proportion to the relative duty cycle of a digital pulsed control input.