53results about How to "Maximize current" patented technology

A number of different dynamic circuits having improved noise tolerance and a method for designing same are provided. The circuits include a power supply node and a precharge node. Keeper circuitry is connected to the nodes and has a current-voltage characteristic that exhibits a negative differential resistance property to improve noise tolerance of the circuits.

A USB battery includes a transistor that controls the flow of current between a USB host and a battery. The transistor is controlled a function of: 1) the amount of current flowing to the battery, and 2) the voltage on the USB VBUS circuit. The transistor dynamically regulates the amount of trickle current to approach a predetermined maximum as closely as practical while maintaining the voltage on the VBUS circuit above a predetermined minimum.

The invention relates to an LED tube system for driving at least one LED assembly comprising: an LED tube housing for containing the at least one LED assembly, two pairs of mains input terminals (A, B) provided at ends of the LED tube housing for receiving a mains supply voltage (Vmns) and for supplying the mains supply voltage (Vmns) to an internal part of the LED tube system for driving the at least one LED assembly, and further comprising a switching circuit being electrically connected with all mains input terminals (A, B, C, D) and being arranged for electrically connecting the pairs of mains input terminals together in a first state (2 / ON) and electrically separating the pairs in a second state (1 / OFF) of the switching circuit. The switching circuit being further arranged for providing a coupling capacitor (C10, C11) between the first pair and the second pair of input terminals in the first state (2 / ON) and removing the coupling capacitor (C10, C11) in the second state (1 / OFF) of the switching circuit. Due to the switching circuit the LED tube system in accordance with the invention can be used in lighting fixtures for parallel fluorescent tubes as well as in lighting fixtures for serial fluorescent tubes. The invention further relates to safety devices for the LED tube system.

During fabrication of an electrical medical lead, a cut end of a stranded wire conductor is subjected to electrical current sufficient to heat and weld the strands together upon discharge of a high voltage between the cut end and a ground metal plate formed of a material of the stranded wire conductor. The discharge of weld energy between the stranded wire cut end and the ground plate induces heat in the wire strands at the stranded wire cut end and the ground plate sufficient to transfer conductive material from the ground plate to fuse the wire strands together. The fusing inhibits unraveling of the wire strands at the fused cut end, whereby the insertion of the stranded wire cable through a lead body lumen and the connection of the fused stranded wire cut end to a further lead component, e.g., a proximal lead connector element or distal electrode, is facilitated.

A convenient source of charging power for portable communication devices is an integral power node of a computer data bus, such as a USB (universal serial bus) port. Unfortunately, USB ports have limited power capacity, making them generally incompatible with battery charge controllers (BCCs) which are designed to receive a steady, high capacity input. The invention provides a battery charging circuit which adjusts to the parameters of an external power supply such as a USB port by adding a regulating circuit to a standard BCC design. This regulating circuit maximizes the current drawn by the BCC, while keeping the voltage to the BCC above a preset minimum (the low voltage shut off level for the BCC). If the voltage to the BCC begins to drop, the regulating circuit reduces the current drawn, so the voltage rises and stays within the operating range of the BCC.

An electrical generator which includes a magnetic field generated within a housing (10) by permanent magnets (19, 20) located within the housing and a coil (23) is resiliently mounted within the magnetic field such that movement of the housing induces movement of the coil to generate a current. The generator includes an electronics device (45) connected to the coil which is adapted to rectify the current and incorporating a charge storage device (46). In one embodiment, at least one coil is suspended on a torsion wire (33) within the magnetic field and the torsion wire carries a counter weight (47) whose mass is selected to resonate with the vibrational frequency to which the generator is subjected. The coils are arranged to oscillate at frequencies less than 100 Hz and are particularly useful in harvesting the motion and vibration of vehicles.

Methods and apparatus are provided for scheduling parallel jobs in a system of virtual containers. At least one parallel job is assigned to a plurality of containers competing for a total capacity of a larger container, wherein the at least one parallel job comprises a plurality of tasks. The assignment method comprises determining a current utilization and a potential free capacity for each of the plurality of competing containers; and assigning the tasks to one of the plurality of containers based on the potential free capacities and at least one predefined scheduling policy. The predefined scheduling policy may comprise, for example, one or more of load balancing, server consolidation, maximizing the current utilizations, minimizing a response time of the parallel job and satisfying quality of service requirements. The load balancing can be achieved, for example, by assigning a task to a container having a highest potential free capacity.

During fabrication of an electrical medical lead, a cut end of a stranded wire conductor is subjected to electrical current sufficient to heat and weld the strands together upon discharge of a high voltage between the cut end and a ground metal plate formed of a material of the stranded wire conductor. The discharge of weld energy between the stranded wire cut end and the ground plate induces heat in the wire strands at the stranded wire cut end and the ground plate sufficient to transfer conductive material from the ground plate to fuse the wire strands together. The fusing inhibits unraveling of the wire strands at the fused cut end, whereby the insertion of the stranded wire cable through a lead body lumen and the connection of the fused stranded wire cut end to a further lead component, e.g., a proximal lead connector element or distal electrode, is facilitated.

The invention relates to a powered device (2) like a luminaire for being used in a power distribution system (100), which is preferentially a PoE system and which comprises a power sourcing device (1) for sourcing a power to the powered device. The powered device comprises an electrical load like an LED and an electrical load power providing unit for generating from the sourced power an electrical load power and for providing the electrical load power to the electrical load, wherein the electrical load power providing unit is adapted to generate the electrical load power with a power level such that an input current drawn by the powered device from the power sourcing device is maximized below a predefined upper input current threshold. This allows increasing the power consumption of the powered device in comparison to the power consumption of powered devices in accordance with the PoE standard IEEE 802.3at.

A Switch Node Assisted Linear architecture, including a linear amplifier in parallel with a switched converter, is configurable in two tracking modes: (a) a SMAL regulator in which the amplifier sets load voltage with an envelope tracking bandwidth, and the switched converter is configured for current assist, and (b) a Switched Mode Power Supply configuration in which the amplifier is switch-decoupled, and the switcher circuit is switched configured with an output capacitor, operable as an SMPS providing load voltage with an adaptive tracking bandwidth that is less than the envelope tracking bandwidth. Staged switching effects substantially seamless transitions between tracking modes, with the amplifier holding the load voltage at a substantially constant envelope tracking voltage (CVET): (a) for ET-AT transitions, the CVET mode enables pre-charging the output capacitor to a target AT voltage, prior to switch-decoupling the amplifier; and (b) for AT-ET transitions, CVET mode enables discharging the output capacitor.

An accurate temperature monitoring system that uses a precision current control circuit to apply accurately ratioed currents to a semiconductor device, which may be a bipolar junction transistor (BJT), used for sensing temperature. A change in base-emitter voltage (ΔVBE) proportional to the temperature of the BJT may be captured and provided to an ADC, which may generate a numeric value corresponding to that temperature. The precision current control circuit may be configured to generate a reference current, capture the base current of the BJT, generate a combined current equivalent to a sum total of the base current and a multiple of the reference current, and provide the combined current to the emitter of the BJT. In response to this combined current, the collector current of the BJT will be equivalent to the multiple of the reference current. The ratios of the various collector currents conducted by the BJT may thus be accurately controlled, leading to more accurate temperature measurements.

An LED lighting array is disclosed wherein a plurality of light emitting devices disposed in at least first and second columns are mounted on a planar mounting surface to form an emission plane. The emission axes of all the LEDs in a first column are parallel with each other and lie in a first plane. The emission axes of the LEDs in an adjacent, second column are also parallel, but a second plane containing the emission axes of the second column is disposed at a predetermined, non-zero angle with respect to the first plane. The non-zero angle is a function of the LED beam width and the distance to a lighting target. This configuration of the LEDs provides an optimum balance at a predetermined target distance between the size of the area illuminated and the brightness of the illumination of the target. In one aspect of the invention the LED lighting array includes at least first, second and third columns of LEDs. In another aspect of the invention an LED task light includes a transparent tube and an LED lighting array disposed within the tube. An electrical drive circuit associated with the mounting substrate within the tube provides pulsed direct current for driving the LED's.

An ion beam tuning method, system and program product for tuning an ion implanter system are disclosed. The invention obtains an ion beam profile of the ion beam by, for example, scanning the ion beam across a profiler that is within an implant chamber; and tunes the ion implanter system to maximize an estimated implant current based on the ion beam profile to simultaneously optimize total ion beam current and ion beam spot width, and maximize implant current. In addition, the tuning can also position the ion beam along a desired ion beam path based on the feedback of the spot beam center, which improves ion implanter system productivity and performance by reducing ion beam setup time and provides repeatable beam angle performance for each ion beam over many setups.

Circuits and methods for a switched power converter providing charge power for at least one battery and at the same time delivering current to operate an electronic device, wherein the converter is enabled to operate out of current limit mode, for the maximum possible range of system load requirements, have been achieved. The input current of the power converter is measured within each cycle-by-cycle, i.e. within each cycle of an external clock reference and the charge current is reduced if the input current exceeds a defined portion, e.g. 80% of the maximum allowable input current. The power converter may only enter current limited operation after the charge current has been already reduced to zero. Operating out of current limit mode ensures a maximum efficiency of the converter, maximize the current deliverable to a given load and minimizes subharmonics in the output current and voltage, thereby minimizing interference with other system component.

A dc electrical machine with a large number of phases. The machine includes a rotor and a stator assembly. The rotor has Np rotating field poles. The stator has Ns winding slots, where Ns / Np is a non-integer ratio. A stator winding includes a plurality of coils received in the winding slots and defines a plurality of stator phases. A power electronic switching assembly includes first and second dc load terminals that can be connected to external equipment and a plurality of switching modules. Each switching module includes power electronic devices and is connected to a respective stator coil. A first proportion of the switching modules are connected together in series between the first and second dc load terminals and a second proportion of the switching modules are connected together in series between the first and second dc load terminals to define two parallel dc circuits.