Abstract: A device for manufacturing a fan casing of a turbomachine made of composite material, in which a mold includes a cylindrical body of lengthways axis and side flanges, and in which a counter-mold includes a cylindrical body and side counter-flanges. The counter-flanges are configured to be attached securely to the flanges, the body of the mold and the body of the counter-mold are concentric, the preform is configured to be positioned between the body of the mold and the body of the counter-mold, and the material of the body of the mold has an appreciably higher expansion coefficient than that of the body of the counter-mold.

Abstract: A ballast and method are presented for detecting end-of-life conditions of fluorescent lamps in which a ballast output is controlled according to a dimming input when a DC voltage or current of the lamp is in a predefined range or when the AC lamp current is below a predefined threshold, and the output is reduced to an EOL protection level when the lamp DC voltage or current is outside the predefined range and the AC lamp current is above the predefined threshold.

Abstract: A circuit for protecting an electronic ballast for use with a remote controller for gas discharge lamps against miswiring to a power source. Depletion mode MOSFETS are employed in both sides of the circuit to the controller and the MOSFETS respond to overvoltage, including polarity reversal to create an open circuit condition in the circuit to the controller.

Abstract: A method for operating a data reproduction device enables users to resume reproduction of audio and/or video content across different devices of the same or different type. According to an exemplary embodiment, the method includes steps of receiving first index data from a different data reproduction device wherein the first index data indicates a first position in content in a first format and the content includes at least one of audio and video data, determining a second position in the content in a second format using the first index data, and enabling reproduction of the content in the second format beginning from the second position.

Abstract: A communications apparatus and techniques are presented for communicating with ballasts or drivers through lighting system power connections in which the power connections are energized with low levels of power to power communications components in the ballast/drivers while the light sources are off and low frequency AC communications signals are transmitted through the power connections.

Abstract: Light e power circuits and EMI filters therefor are presented in which a depletion mode field effect transistor is connected in series with an EMI filter capacitor following an input rectifier to allow filtering of EMI and to limit capacitive currents during triac switching when powered through a phase-cutting dimmer circuit.

Abstract: Drivers and ballast circuits are presented having a boost converter with a triac compatibility circuit providing regulated current load to accommodate phase-cutting triac circuit holding current requirements, including auto switching driver circuit with overvoltage protection and an auto leveling circuit to regulate against thermal and load fluctuations.

Abstract: An LED driver is presented with a sensing circuit and attenuator circuits to provide three-way switched dimming as well as phase-cut dimming to control the output power driving an LED load.

Abstract: A LED driver circuit and an isolated DC-DC converter therefor are presented, in which a primary side state estimator circuit is provided for inferred output current sensing for closed loop control of pulse width modulated flyback or buck converters.

Abstract: An apparatus and method is presented for implementing and controlling a voltage converter with one input voltage and multiple output voltages. In the case of boost and buck-boost converters, a converter circuit with one inductor and a switched group of parallel connection capacitors is realized, one parallel connection for each output voltage. A duty ratio is monitored for the inductor and the switched group of capacitors to provide a set of duty ratios. The duty ratios form a control vector which describes the control inputs. The output voltages are the control outputs describing a MIMO system. A generalized Cuk-Middlebrook modeling approach is applied to the voltage converter, along with linearization and MIMO control methods to regulate all output voltages to desired levels.

Abstract: An Orthogonal Frequency Division Multiplexing (OFDM) receiver that employs N second-order phase-lock loops sharing a common integrator (where N is the number of pilots in the system). The N second order phase-lock loops track out independent pilot phase rotations to facilitate the constructive averaging of the pilots' phase information. At the same time, by sharing a common integrator, the OFDM receiver takes advantage of noise averaging over multiple pilots to obtain a cleaner frequency offset estimation. The OFDM receiver may also compensate for FFT window drift by calculating a phase difference between a selected pair of pilots and tracking the rate of change of the calculated phase difference over time. The calculated phase difference is used to control the position of an upstream FFT window after a predetermined phase difference threshold is exceeded. The tracked rate of change is used to continuously adjust the phase of downstream equalizer taps.

Abstract: Light sources are presented in which lamp ballast or LED driver circuitry is disposed within a base assembly using integrated boards with components embedded between board layers and or circular flex boards with pot core magnetic components and/or ASICs and thermally conductive board core materials with thermal vias, reflective mirrors, and/or potting materials to conduct heat out through the base to facilitate reduced form factors for lamps and/or LED light sources.

Abstract: A ballast and method are presented for detecting end-of-life conditions of fluorescent lamps in which a ballast output is controlled according to a dimming input when a DC voltage or current of the lamp is in a predefined range or when the AC lamp current is below a predefined threshold, and the output is reduced to an EOL protection level when the lamp DC voltage or current is outside the predefined range and the AC lamp current is above the predefined threshold.

Abstract: An apparatus including a second stage correlator for receiving input data from a first stage correlator, wherein said second stage correlator includes a memory is described. A method for performing a second stage correlation on data including resetting a read pointer and a write pointer, alternatively multiplexing input data into one of a pair of storage registers, concatenating contents of the pair of storage registers, writing the concatenated contents into a memory in accordance with the write pointer, outputting the concatenated contents from the memory into a read register in accordance with the read pointer, updating the read address pointer and updating the write address pointer is also described.

Abstract: A communications apparatus and techniques are presented for communicating with ballasts or drivers through lighting system power connections in which the power connections are energized with low levels of power to power communications components in the ballast/drivers while the light sources are off and low frequency AC communications signals are transmitted through the power connections.

Abstract: An interface circuit for a lamp ballast includes first and second input power lines, L1 and L2, with first and second respective switches, and a neutral power line N, all coupled to a diode bridge. Closing one of the first or second input power lines L1 or L2 causes a photodiode in an opto-isolator coupled to the diode bridge to turn ON, which in turn causes a MOSFET in a control circuit to be in an open state. When in the open state, a first resistor coupled to the source of the MOSFET is included in the control circuit and causes a lamp attached thereto to operate in a dimmed state. When both input power line switches are closed, L1 and L2 are both coupled to the diode bridge and thereby cause the phototransistor to be in an OFF state, which causes the MOSFET to close, thereby including a second resistor, coupled to the drain of the MOSFET, in the control circuit in parallel with the first resistor. This in turn causes the lamp to operate at full intensity.

Abstract: A Universal Mobile Telecommunications System (UMTS) receiver comprises an adjustable delay line, a secondary synchronization processor and a controller. The secondary synchronization processor performs frame synchronization on a received wireless signal that is provided via the adjustable delay line. The controller varies the sub-chip timing delays provided by the adjustable delay line until a measure of accuracy of the frame synchronization process exceeds a predetermined threshold, upon which frame synchronization occurs.

Abstract: A risk of shock (ROS) protection circuit is disclosed, which comprises a capacitor that charges whenever there is a voltage between a ground on a lamp ballast and earth ground. If the capacitor exceeds a predetermined threshold voltage, the capacitor causes a gate to shunt current away from a tertiary winding in a control circuit, which in turn reduces impedance reflected by the tertiary winding back on to primary and secondary windings in the ballast circuit. The reduced reflected impedance causes the operating frequency of the ballast to increase, reducing the voltage between the ballast ground and earth ground until it is safe for human contact. In this manner, a human replacing a lamp connected to the ballast can be protected from shock despite a failure to disconnect the power to the lamp ballast prior to lamp replacement.

Abstract: A system and method for supporting updates of database contact information to mobile communications devices includes a system having a data entry computer for compiling database contact information for a group of mobile communications devices, a service provider computer server in signal communication with the data entry computer for uploading the database contact information into the service provider computer server and for downloading the database contact information substantially simultaneously to the group of mobile communications devices, and a mobile communications device in signal communication with the service provider computer server for receiving the database contact information and for updating its own global logical database; wherein the method for supporting updates of database contact information to mobile communications devices includes the steps of compiling database contact information for a group of mobile communications devices, uploading the database contact information to a service provid

Abstract: Isolated LED power sources and DC-DC converters therefor are presented in which the DC-DC converter includes a self-oscillating inverter driving an output rectifier for operating an LED array of one or more LEDs, where the inverter uses a control transformer with core having a Curie temperature set to a maximum operating temperature of one or more power supply components to reduce inductances of secondary windings in the inverter oscillation circuitry to lower the power supplied to the load so as to prevent the inverter from overheating.