Abstract: An LED driver system including an input receiving a rectified AC conductive angle modulated voltage on a rectified node, a converter, a low-pass filter, and AC detector, and a driver network. The converter is coupled to the rectified node and includes a power switching device coupled to a switching node, in which the power switching device is controlled to convert the rectified AC conductive angle modulated voltage to an output voltage and output current. The low-pass filter is configured to filter voltage of the switching node to provide a filtered voltage. The AC detector receives the filtered voltage and provides a current sense signal indicative thereof. The driver network controls duty cycle of the power switching device based on the current sense signal.

Abstract: The invention is an induction-based lighting system designed to provide power to model displays and other similar applications. The first part of the system is the wireless Power Mat that is placed under the model houses and used as the base for the village, and contains a primary winding that interacts with secondary windings placed inside display components to provide lighting effects, such as one finds in model Christmas villages. The electrical characteristics of the primary winding can be controlled by a microcontroller to make lights in the models blink or change as a user desires.

Abstract: A load control device includes saturable devices, loads, a phase controller, a bypass unit, and a controller. Plural saturable devices are connected in series to each other. Plural loads are respectively connected to the saturable devices and are supplied with power via the saturable devices. The phase controller phase-controls an output voltage of an AC power supply so as to be supplied to the respective loads. The bypass unit can supply a reduced bypass current so as to bypass the phase controller from a zero cross point of each half cycle of an AC power supply voltage. The controller sets an output of the phase controller and controls the output thereof to a set output value, and stops the supply of the bypass current in a condition in which a firing angle (conduction phase) is equal to or more than the predetermined value.

Abstract: A multi-lamp driving system includes a power stage circuit, a pulse width modulation (PWM) controller, a plurality of transformer circuits, and an abnormal detection circuit. Each of the transformer circuits includes a first primary winding and a second primary winding connected in series and a first secondary winding and a second secondary winding respectively outputting AC power signals to drive at least one lamp. The abnormal detection circuit is connected to a junction of the first primary winding and the second primary winding of each of the transformer circuits, and determines if voltages of the junction of the first primary winding and the second primary winding of each of the transformer circuits are different to determine if the at least two lamps are normal. The abnormal detection circuit further generate control signals to control the PWM controller upon the condition that one of the at least two lamps are abnormal.

Abstract: A multi-lamp driving system includes a power stage circuit, a pulse width modulation (PWM) controller, a plurality of transformer circuits, and an abnormal detection circuit. Each of the transformer circuits includes a first primary winding and a second primary winding connected in series and a first secondary winding and a second secondary winding respectively outputting AC power signals to drive at least one lamp. The abnormal detection circuit is connected to a junction of the first primary winding and the second primary winding of each of the transformer circuits, and determines if voltages of the junction of the first primary winding and the second primary winding of each of the transformer circuits are different to determine if the at least two lamps are normal. The abnormal detection circuit further generate control signals to control the PWM controller upon the condition that one of the at least two lamps are abnormal.

Abstract: A wireless power transmission system comprises: a power transmitter, which includes a power amplifier that provides a sinusoidal waveform in the frequency range of about 20 to 500 kHz; a first loop antenna producing an alternating magnetic field within a selected area; a power receiver, which includes a second loop antenna located at least partially within the alternating magnetic field of the first antenna; and an electricity-consuming device connected to the output of the power receiver. Both transmitter and receiver preferably contain a capacitive circuit element to optimize tuning, which may be discrete capacitors or may rely on the self capacitance of the antenna(s). Applications of the system include: wirelessly powered lights for fans, boats, aquariums, display cases, etc.; wirelessly powered sensors and other devices for use with captive animals; and systems for transmitting useful power through construction materials to devices on the other side of walls or other structures.

Abstract: Electrical systems comprising a power distribution system (Ia) for distributing high frequency AC power having s twisted pair conductor and power tapping element, for instance to an LED or OLED load. The electrical systems comprise an LED or OLED luminaire (Ic) having a heat sink and a light diffusing optical element and power supplies for powering LEDs or OLEDs such as those used in the luminaire (Ic).

Abstract: The present invention provides a multiple lamp driving capable of being applied to a multiple lamp system such as an LCD, wherein the multiple lamp driving device includes: a power supply unit for supplying a driving voltage to a lamp unit provided with first to 4nth lamps; and a balancing circuit unit including first to nth balance transformers for receiving the driving voltage from the power supply unit and balancing currents flowing through the first to 4nth lamps, wherein each of the first to nth balance transformers includes a primary side connected to the power supply unit in series and first and second secondary sides electrically connected to the primary side, each one end of the first and second secondary sides is connected to one end of one of the first to 4nth lamps, each of the other ends of the first and second secondary sides is connected to one end of another among the first to 4nth lamps, and the other ends of all of the first to 4nth lamps are connected to a ground.

Abstract: The present invention provides a multiple lamp driving capable of being applied to a multiple lamp system such as an LCD, wherein the multiple lamp driving device includes: a power supply unit for supplying a driving voltage to a lamp unit provided with first to 4nth lamps; and a balancing circuit unit including first to nth balance transformers for receiving the driving voltage from the power supply unit and balancing currents flowing through the first to 4nth lamps, wherein each of the first to nth balance transformers includes a primary side connected to the power supply unit in series and first and second secondary sides electrically connected to the primary side, each one end of the first and second secondary sides is connected to one end of one of the first to 4nth lamps, each of the other ends of the first and second secondary sides is connected to one end of another among the first to 4nth lamps, and the other ends of all of the first to 4nth lamps are connected to a ground.

Abstract: A backlight driving system comprises an inverter module, a current balance module, a feedback module and an open-lamp protection detection module. The inverter module provides electrical signals to a plurality of lamps. The current balance module balances currents flowing through the plurality of lamps. The feedback module detects the current of the backlight and generates a feedback signal to the invert module accordingly. The open-lamp protection detection module detects voltage variations of the feedback transformer and generates a detection signal to the inverter module accordingly. The inverter module regulates the currents flowing through the plurality of lamps according to the feedback signal and determines one or more of the plurality of lamps are faulty according to the detection signal generated by the open-lamp protection detection module, and stops providing the electrical signals to the plurality of lamps.

Abstract: To provide a multiple-light discharge lamp lighting device that stabilizes and equalizes tube current of a plurality of discharge lamps without arranging a Ballast element to the secondary side of an inverter transformer with low costs. A multiple-light discharge lamp lighting device 10 according to the present invention includes inverter means 12 and a plurality of inverter transformers TR1 to TRn. Discharge lamps La1 to Lan are connected to secondary windings Ns1 to Nsn of the inverter transformers TR1 to TRn. Preferably, variable impedance elements Z1 to Zn, as variable inductance elements, are serially connected to primary windings Np1 to Npn of the plurality of inverter transformers TR1 to TRn. Accordingly, the tube current can be stabilized and equalized without using an element resistant to a high voltage.

Abstract: An inverter circuit is configured with a reduced number of components for driving a plurality of discharge tubes. Primary coils of a plurality of drive transformers are respectively connected in series to primary coils of corresponding balancer-transformers, and then connected between output terminals of a switching circuit in parallel. The secondary coils of the balancer-transformers are connected in series, and connected between the output terminals of the switching circuit to configure an inverter circuit for driving a plurality of discharge tubes. The inverter circuit includes a voltage detecting circuit for detecting a voltage at any of connecting-midpoint of the series-connected secondary coils of the balancer-transformers, and a voltage comparing circuit for comparing an output of the voltage detecting circuit with a reference voltage. A signal designates an abnormal operation at an output of the voltage comparing circuit when the voltage of the connecting-midpoint exceeds the reference voltage.

Abstract: A coupled lamp driving device is described, comprising an alternating current (AC) power supply providing a sine-wave to two ends of each of a plurality of coupled transformers each having a primary side connected to each other at a primary side thereof and a secondary side; the plurality of coupled transformers connected to each other at the primary side thereof directing the sine-wave signal from the AC power supply to the two sides of the primary side of each of the coupled transformers and connected to an end of one of a plurality of lamps at one end of the secondary side thereof and connected to a reference level at the other end thereof, and the plurality of lamps each having the other end connected to a reference level. Since the primary sides of the coupled transformers are connected in series, a current flown on the primary side of each of the coupled transformers is equal to each other, respectively.

Abstract: A lamp current control device includes an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC. The transformer has its primary side connected to the electronic power switch and a secondary side connected to a lamp. The current transformer is serially connected with the primary side of the transformer. The PWM IC is coupled between a secondary side of the current transformer and the electronic power switch and uses the current transformer to feedback a feed back signal from the primary side of the transformer. The PWM IC receives and processes the feed back signal to obtain a control signal, and then the PWM IC outputs the control signal to the electronic power switch to control a pulse width outputted by the electronic power switch, thereby controlling and maintaining a brightness of the lamp.

Abstract: A pathway lighting system has self-contained, battery up scaled lighting modules (20), each module including at least one secondary coil. A plurality of primary coils are housed within a carrier assembly (1) together with voltage circuitry (14). Primary and secondary coils, positioned in the carrier assembly and in the lighting modules and the respectively allow electricity to flow between these members. The secondary coil output voltage is able to be rectified with the use of a rectification circuit, housed in the lighting module. Upon a mains failure, a battery charger/changeover circuit would switch the power requirements of the light sources inside the pathway lighting module over to internal back up batteries.

Abstract: A DC-AC inverter that is adaptable for use with different input voltages and for use with different loads. The DC-AC inverter has a voltage-step-up network, with the step-up voltage set by a controller that drives totem-pole configured FET switches at a duty cycle that depends on the desired step-up voltage. The controller beneficially regulates its duty cycle in response to current and/or voltage feedback signals. Also beneficially, the DC-AC inverter includes a configurable inductor and a configurable transformer. Such configurable components enable efficient operation with different loads. Such DC-AC inverters are particularly useful in driving liquid crystal display lamps.

Abstract: A constant current regulator that receives an AC input current from a source provides a constant AC current to a load. The regulator includes first, second, third, and fourth electronically controllable switches, a transformer coupled to the switches, and a controller connected to the switches. An output of the first switch is electrically connected to an input of the second switch and one input of the transformer primary winding. An output of the third switch is electrically connected to an input of the fourth switch and another input of the transformer primary winding. The controller provides a trigger signal to each of the switches. The controller adjusts a duty cycle of the trigger signals based on a comparison between an actual current value and a reference current value to provide a constant AC current to the load.

Abstract: A ballast including a single sense element and a single controller for mulitple lamp operation. The ballast avoids the need for separate feedpaths for sensing individual lamp conditions and/or the need for separate controllers for controlling the individual lamp conditions. Consequently, the ballast scheme avoids the use of expensive components (e.g. controllers and chokes) and minimizes the number of components required in order to operate multiple lamps.

Abstract: The invention relates to a method and system for communicating from the secondary side of an isolation transformer (6) to receiver means, the primary of said transformer being connected via a power cable to a circuit fed with a periodic voltage from a constant-current generator, said receiver means being connected to said circuit. More particularly, switch means (30) are arranged for generating communicating signals by momentarily affecting the impedance on the secondary side so as to generate one or more voltage pulses on the primary side (8) of the transformer for propagation along the cable to said receiver means.

Abstract: A field lighting network providing for individual control of the light fittings while reducing overall cable costs. A converter unit converts a supply voltage obtained from an A.C. main to a substantially constant current in a Boucherot circuit with a series resonance circuit, tuned to the main frequency. The converter unit includes a Boucherot circuit having a series resonance circuit, substantially tuned on the main frequency, and an additional inductance in series with a load connected to the converter unit. A regulator unit supplied with current couples to each fitting or group of fittings for individual regulation of the current passing through the respective lamp or lamps. Each regulator unit is disposed to receive control information on the power cable.

Abstract: A lamplight failure detection system for detecting lamplight failure in a lamplight circuit, the lamplight circuit having a plurality of lamplight units connected with the secondary side circuits of each of a plurality of current transformers, the current transformers having their primary side circuits connected in series to an alternating current power supply.

Abstract: A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal unit including a short-circuit switch for short-circuiting the secondary winding side of the transformer when the lamp is disconnected. A master station issues a request for detecting a disconnected lamp or checking whether or not failure occurs in the terminal unit to each terminal unit in the form of an instant power interruption. Each terminal unit has a proper identification time assigned thereto.

Abstract: A power-limited (Class-2/3) fluorescent lighting system suitable for use with suspended ceiling systems consists of the following principal components:a) power-line-operated power supplies, each power supply having a plurality of outputs, with each such output being a 30 kHz voltage limited in voltage/current/power magnitudes in such a way as to constitute a Class-2/3 circuit in accordance with the National Electrical Code;b) fluorescent lighting units, each such unit comprising one or more fluorescent lamps and a matching network operative to derive the requisite lamp operating voltages and currents from one of the Class-2/3 outputs of one of the power supplies; andc) for each lighting unit, a flexible wiring means to provide for easy plug-in connection with one of the individual outputs of said power supply.The individual lighting units and its wiring means can safely and easily be installed and/or removed by persons of but ordinary skills.

Abstract: A fluorescent lamp operating system comprises:(i) a plurality of pairs of fluorescent lamps for providing luminous radiation, each pair of lamps being adapted to be powered from 30 kHz/120 Volt by way of a high-Q series-resonant L-C ballasting circuit;(ii) a relatively low-power frequency converter connected with the power line and operable to provide power for heating the cathodes in these fluorescent lamps, thereby conditioning the lamps for easy starting;(iii) a relatively high-power frequency converter also connected with a power line and operable to provide the 30 kHz/120 Volt required for operating the plurality of pairs of fluorescent lamps by way of the high-Q series-resonant L-C ballasting circuit; and(iv) delay means operable to prevent the 30 kHz/120 Volt provided by the high-power frequency converter from being applied to the fluorescent lamps until after power has been applied to heat the lamp cathodes for at least one second.

Abstract: A power-line-operated ballast for two fluorescent lamps has a self-oscillating half-bridge inverter whose 30 kHz squarewave output voltage is switchably connected either with an auxiliary transformer and/or with a series-resonant L-C circuit. The lamps are series-connected across the tank capacitor of the L-C circuit; the lamps' cathodes are connected with individual outputs of the auxiliary transformer.When power is initially applied to the ballast, only the auxiliary transformer is connected with the inverter output, thereby providing heating power to the lamps' cathodes. After about 1.5 second, the L-C circuit is automatically connected with the inverter output, and the lamps then ignite in ordinary Rapid-Start manner. The auxiliary transformer is automatically disconnected at the time the L-C circuit is connected, thereby providing for extra high efficiency operation.In the event the lamps become disconnected or inoperative, the inverter will become disabled within about 15 milli-seconds.

Abstract: A lighting arrangement comprises;(i) a plurality of pairs of mutually parallel-oriented fluorescent lamps, each pair of lamps adapted to be powered from 30 kHz/240 Volt by way of a high-Q series-resonant L-C ballasting circuit;(ii) a relatively low-power frequency converter connected with the power line and operable to provide power for heating the cathodes in these fluorescent lamps, thereby conditioning the lamps for easy starting;(iii) a relatively high-power frequency converter also connected with a power line and operable to provide the 30 kHz/240 Volt required for operating the plurality of pairs of fluorescent lamps by way of the high-Q series-resonant L-C ballasting circuit; and(iv) delay means operable to prevent the 30 kHz/240 Volt provided by the high-power frequence converter from being applied to the fluorescent lamps until after power has been applied to heat the lamp cathodes for at least one second.

Abstract: A power circuit for N series connected loads according to the present invention includes N transformers having primary windings connected in series across a constant current AC source and secondary windings connected in series with the N loads. N-1 conductors are coupled from a junction between the loads to a corresponding junction between the secondary windings. Failure of one of the loads resulting in an open circuit will not interrupt power to the remaining loads.

Abstract: An electrodeless high intensity arc discharge lamp employs an excitation coil comprised of a high-temperature metal, such as tungsten or molybdenum, wound directly on the hot quartz envelope of the arc tube within the interior of the outer glass envelope of the lamp, thereby requiring substantially lower current and voltage from the power supply than such lamps having external excitation coils, while emitting less electromagnetic noise. The excitation coil losses are comparable to those of the external excitation coils or prior electrodeless high intensity arc discharge lamps.

Abstract: A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core and at least a primary coil and at least a secondary coil. The ballast transformer has parameters that are selected in accordance with the operational conditions, that is, the extinguished and non-extinguished states of the gas discharge lamp. The primary coil and the area of the core have parameters selected in accordance with the extinguished state of the gas discharge tube. The primary and secondary coils have a selected turn ratio so as to produce a current level sufficient to maintain the ionization condition of the gas discharge tube in its non-extinguished state.

Abstract: A gas discharge apparatus includes a discharge chamber including a transparent dome portion and an electrode-including base portion, which together enclose an ionizable gas. A cup-shaped base member is affixed at its periphery to the edge of the base portion of the discharge chamber. A power supply and discharge excitation network is disposed within the interior of the base portion. The power supply and discharge network include a pair of terminals. An oscillator and associated step-up output transformer powered from the terminals is positioned between the terminals and the discharge chamber. A field shield including a conductive sheet member is positioned between the terminals and the discharge chamber. The field shield is adapted to be electrically coupled to the electrode so that discharge-supporting electric fields may be established in the discharge chamber between the electrode and through the dome portion of that chamber to an effective ground electrode exterior to the chamber.

Abstract: Subject power-limited lighting system consists of the following principal component parts: (a) a number of power-line-operated power supplies, each such power supply having a plurality of individual output receptacles, with each output receptacle being limited in terms of maximum voltage, current and power in such a way as to be classified as a Class-3 circuit according to the National Electrical Code; (b) for each power supply, a plurality of lighting units, each such lighting unit comprising one or more lamps (H.I.D.

Abstract: A lighting system comprises gaseous discharge lamps (8) connected to a source (1) of regulated alternating current through current transformers (5). The primary windings (6) of the current transformers (5) are connected in series to the source (1). The gaseous discharge lamps (8) are connected to the secondary windings (7) of the transformers (5).The lighting system is designed for lighting industrial buildings, streets, highways, stadiums, mines, etc.

Abstract: A high efficiency push-pull inverter circuit employing a pair of relatively high power switching transistors is described. The switching on and off of the transistors is precisely controlled to minimize power losses due to common-mode conduction or due to transient conditions that occur in the process of turning a transistor on or off. Two current feed-back transformers are employed in the transistor base drives; one being saturable for providing a positive feedback, and the other being non-saturable for providing a subtractive feedback.

Abstract: A ballast circuit for limiting the kilovolt-ampere rating of a ballast required to operate a high pressure sodium lamp during starting, hot restart and lamp out conditions. The ballast circuit includes a voltage limiting or clamping circuit across the secondary of a ballast transformer which responds to the voltage level and the rate of change of voltage across the secondary to activate a switch during each half cycle that the secondary of the ballast transformer goes into saturation.

Abstract: A lamp circuit is provided having a constant current type AC power source and a plurality of isolation transformers connected in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The voltage-time area, which is measured from the rise of the voltage output signal of the power source to the rise of the current output signal of the power source is detected and is compared with a reference predetermined value. Thereby when the detected value exceeds the reference value an alarm signal is generated and the number of the disconnected lamps can be determined and displayed.

Abstract: A power supply system for operating fluorescent lamps in a hazardous atmosphere comprises a 1 kHz to 500 kHz constant current power supply which feeds primary windings of transformers which are connected together in series. Fluorescent lamps are connected across the transformer secondary windings. A voltage control circuit is connected to the supply supply output to ensure that the amount of electrical energy supplied to the transformers cannot ignite the atmosphere under any normal or fault condition. Capacitors are connected in series with the transformer primary windings to reduce the circuit reactance so that, for a given level of supply voltage, an increased number of lamps can be fed with starting voltage. Due to the substantially constant current which is fed through the transformer primary windings, the situation cannot occur that the firing of one lamp prevents the others from firing. The transformers preferably include windings to feed heaters of the lamps.

Abstract: An electronic ballast circuit for a multiple gaseous lamp load includes a feedback rectifier circuit coupled to a high frequency inverter circuit and to a DC source. The high frequency inverter circuit is also coupled to the multiple gaseous load and a variation in an alterable impedance of the feedback rectifier circuit causes a variation in power applied to the multiple gaseous load and power provided by the DC source.