Abstract: Systems and methods are disclosed for controlling the operation of visual indicators, such as light emitting diodes (LEDs). A novel circuit may be employed to energize one indicator while de-energizing a second indicator, and vice versa. The novel circuit uses at least one switching component to perform a switching operation on the indicators.

Abstract: An electrical device with a power switch has at least two different electrical operational states and a circuit which detects a sequence of momentary fluctuations of power defining a First user message, corresponding to a change in state. The circuit implements that change in state in response to detection of the First message. Another circuit detects a sequence of momentary fluctuations of power, different from the sequence of the First user message, defining a Second user message and defining a fixed Reset electrical operational state. The device also implements a change from the current electrical operational state, to the fixed Reset electrical operational state. A memory circuit stores the current electrical operational state, a number corresponding to one of the countable numbers of electrical operational state, and provides retentions of its memory, including the stored current electrical operational state, during periods of power off.

Abstract: A configurable controller for a lighting arrangement or assembly is adapted to control or change an output characteristic of the lighting arrangement in response to a user input received at a user interface. The configurable controller limits the amount to which a user input at the user interface may adjust the output characteristics by storing a range of selectable or presently available values for the output characteristic. This range of selectable values is adjustable based upon a configuration input received from a remote device at a communication unit.

Abstract: Configurable LED light improving community safety and the environment by providing illumination as function of internal self-diagnostics and status of ambient environment, comprising: controller, sensors, LED's, interfaces, enclosure. Sensors include: ambient light, proximity, temperature, voltage, current. Interfaces include: wireless, INTERNET. LED's configurations include: single color, multicolor, flexible PCB. Enclosure configurations include: water-proof, recess, surface mounting, hidden magnets for latch-in mounting. Controller configurations define real-time control algorithm based on: sensor status; time based controls; apparatus operating acceptance criteria. Apparatus acceptance criteria include: operation within specifications; optimization of energy consumption; contribution to environmental safety. Control algorithm includes: real-time internal and external diagnostics; and controls sustaining operation within acceptance criteria. Apparatus configurations stored in non-volatile memory.

Abstract: An illumination device, system, and method are disclosed. The illumination system includes a first set of light sources and a second set of light sources, driven by a first driver and second driver, respectively. The system further includes a dimming control system that implemented dimming control logic. The dimming control logic coordinates the operation of the first and second drivers such that the first and second sets of light sources are activated and deactivated so as to achieve substantially constant color temperature during dimming operations.

Abstract: A lighting system according to embodiments includes a first light source, a second light source, a first lighting circuit, a second lighting circuit, a signal input unit, and a control circuit. The first light source has a predetermined color temperature. The second light source has a color temperature which is different from that of the first light source. The first lighting circuit lights the first light source. The second lighting circuit lights the second light source. The signal input unit receives an external signal. The control circuit includes a first light source lighting control cycle which performs a predetermined lighting control of the first light source, and a second light source lighting control cycle which performs a predetermined lighting control of the second light source, controls the first and second lighting circuits so as to start the lighting control.

Abstract: In a lighting device, sets of LEDs are employed using the natural characteristics of the LEDs to resemble incandescent lamp behavior when dimmed, thereby Obviating the need for sophisticated controls. A first set of at least one LED produces light with a first color temperature, and a second set of at least one LED produces light with a second color temperature. The first set and the second set are connected in series, or the first set and the second set are connected in parallel, possibly with a resistive element in series with the first or the second set. The first set and the second set differ in temperature behavior, or have different dynamic electrical resistance. In various embodiments, the sum of the currents provided to the first and second sets may be substantially equal to a magnitude of an input current.

Abstract: A lighting system according to embodiments includes a first light source, a second light source, a first lighting circuit, a second lighting circuit, a signal input unit, and a control circuit. The first light source has a predetermined color temperature. The second light source has a color temperature which is different from that of the first light source. The first lighting circuit lights the first light source. The second lighting circuit lights the second light source. The signal input unit receives an external signal. The control circuit includes a first light source lighting control cycle which performs a predetermined lighting control of the first light source, and a second light source lighting control cycle which performs a predetermined lighting control of the second light source, controls the first and second lighting circuits so as to start the lighting control.

Abstract: A system and architecture for managing lighting through a seamless low-voltage bus network is disclosed. The system comprises a plurality of control units that serve as nodes for integrating devices, such as light fixtures, control switches and sensors into the bus. Each of the control units preferably includes a printed circuit board and node interconnects for assembling the low-voltage bus and for integrating the devices. Alternatively, the system comprises a central hub with a master printed circuit control board and a plurality of interconnects for assembling the bus and for integrating the devices.

Abstract: A digital pulse shaping and phase modulation network is used for reducing out-of-band spectral energy. This network is used in conjunction with a NCO (numerically controlled oscillator) which includes a linear phase input port. This circuit converts rectangular data pulses into a user programmed shape. The shape pulses are then modulated onto the carrier via the linear phase port. Depending on the preprogrammed pulse shape, the out-of-band spectral energy is significantly reduced.

Abstract: A luminosity control device includes a photosensitive member to control the duty cycle of a square wave pulse oscillator. Then a high power switching tube and a high power gain tube are used to proceed with the luminosity control. Thus, when two cars meet, the luminosity of headlamps will automatically weaken so as not to dazzle the driver's eyes in the opposite direction. Should no car come in the opposite direction, the headlamps will automatically intensify the luminosity thereof. In this manner, it is possible to effectively control the luminosity of headlamps and thereby achieve the object of traffic safety.

Abstract: A dimming circuit (10) for use with an illuminated dual display (12) of an aircraft instrument is provided. A voltage divider (14) divides a variable supply voltage, V.sub.S, produces an input voltage, V.sub.IN, and applies V.sub.IN to one input of a switch (16). A threshold voltage circuit (15) receives the V.sub.S voltage and produces a reference voltage, V.sub.REF, and a lower magnitude supply voltage, V'.sub.S. A reference comparator (OA3) compares the V.sub.REF and V'.sub.S voltages and produces a threshold voltage, V.sub.T. The V.sub.T voltage is applied to a second input of the switch (16). A first comparator (OA1) in the switch (16) produces a low output voltage when the V.sub.T voltage exceeds the V.sub.IN voltage and causes a first lamp (L1) to brightly illuminate a first indicia (24). A second comparator (OA2) in the switch (16) produces a low output voltage when the V.sub.T voltage is less than the V.sub.IN voltage, which causes a second lamp (L2) to dimly illuminate a second indicia (26).

Abstract: A circuit arrangement for different color light emission, comprises first series circuit of a first light-emitting element having a given color, a diode, and a resistor; and a second series circuit of a second light-emitting element having another color and a collector-emitter path of a transistor, where the transistor is responsive to an input control signal so as to change a current flowing therethrough. The first and second series circuits are connected in parallel and are interposed between two terminals of a power source. The impedance of the first series circuit is selected to be much greater than that of the second series circuit when the transistor is conductive. When the voltage of the input control signal is below a predetermined level, the transistor is kept nonconductive so that only the first light-emitting element is energized.

Abstract: A circuit for suppressing interference pulses occurring in transformers with high leakage inductance. The circuit includes current controlled switches connected to the transformers having secondary windings. The switches are controlled by a trigger circuit and a control device. The interference pulses are suppressed by a pulse suppression circuit connected between the secondary windings of the transformers and the trigger circuit. Furthermore the transformers' secondary windings are interconnected in phase to the pulse suppression circuit. The correct interconnection is controlled and/or indicated.

Abstract: Two lamps are controlled in that one is off and the other one on or vice versa with fractural transition from one state to the other being controlled by a differential amplifier with integrated, pulse or trigger switch operated Miller integrator. The differential amplifier control circuit elements (transistors, triacs) in separate circuit paths for the lamps. The control is either a direct one (d.c.) or an indirect one through phase shifting of firing pulses in a.c. operated triacs.

Abstract: A control circuit for progressively and gradually varying the illumination intensity of incandescent lamps. The circuit comprises a source of alternating current connected in series with an electric lamp load which is also in series with a silicon controlled rectifier. This silicon control rectifier is rendered conductive when its gate is actuated by a gate signal generated by a programmable unijunction transistor (PUT). The conduction of the PUT depends on the voltage applied on its gate by a gate biasing circuit connected thereto and which comprises a charging capacitor. On the other hand, a charging circuit is connected across the silicon control rectifier whereas a second charging circuit is connected between the anode of the PUT and the first-mentioned charging circuit.