Abstract: A power converter providing required hold up for a primary converter, particularly a cycloconverter, without the required hold up capacity by an auxiliary converter including storage capacitors having the requisite capacity. The auxiliary converter may be isolated from the primary converter during normal operation and switched in during power supply discontinuities. The storage capacitors may be charged via a voltage step up circuit to achieve improved charge utilization. The storage capacitors may be charged via a charge path independent of the auxiliary converter output path so that the storage capacitor charging rate may be set independently.

Abstract: A power generation and transmission system, including: a wind turbine having an electrical generator (12) producing AC electrical power at a production frequency; a converter connected to the electrical generator (12) and configured to convert the AC electrical power to a transmission frequency below a grid frequency; an insulated transmission cable (18) connected to the converter and disposed at least partly submarine or subterranean; and a synchronous frequency converter (24) remote from the wind turbine and configured to receive the AC electrical power from the insulated transmission cable (18) and to convert it to the grid frequency for supply to a grid.

Abstract: An energy transfer assembly with tuned leakage inductance and common mode noise compensation is disclosed. An example energy transfer assembly for use in a resonant power converter includes a first winding wound around a bobbin mounted on a magnetic core. The first winding has a first number of layers proximate to a first end along a length of the bobbin and a second number of layers proximate to a second end along the length of the bobbin. The energy transfer assembly also includes a second winding wound around the bobbin. The second winding has a third number of layers proximate to the first end along the length of the bobbin and a fourth number of layers proximate to the second end along the length of the bobbin. The first and second windings are wound around the bobbin such that at least a portion of one of the first and second windings overlaps at least a portion of an other one of the first and second windings around the bobbin.

Abstract: The present invention provides a radio frequency (RF) power supply in a mass spectrometer. The power supply provides an RF signal to electrodes of a storage device to create a trapping field. The RF field is usually collapsed prior to ion ejection. In an illustrative embodiment the RF power supply includes a RF signal supply; a coil arranged to receive the signal provided by the RF signal supply and to provide an output RF signal for supply to electrodes of an ion storage device; and a shunt including a switch operative to switch between a first open position and a second closed position in which the shunt shorts the coil output.

Abstract: A coil substrate structure which enhances heat dissipation and fully secures a mounting area is provided. A coil substrate structure 100 comprises a first coil substrate 110 having a primary transformer coil part 41; a second coil substrate 120, disposed on the first coil substrate 110, having a secondary transformer coil part 42; and a transformer core 130 for magnetically connecting the transformer coil parts 41, 42 to each other. The coil substrates 110, 120 are disposed on each other while being shifted from each other such that the transformer coil parts 41, 42 overlap each other as seen in the substrate thickness direction. This can increase the heat dissipation area of the coil substrates 110, 120. The transformer coil parts 41, 42 have a width in a transmission direction A narrower than a width in a direction B intersecting the transmission direction A as seen in the substrate thickness direction. This can reduce the multilayer area of the coil substrates 110, 120 in the transmission direction A.

Abstract: Primary and secondary coils are provided in the first through section and a coil group is also provided in the second through section. Hence, the surface area over which the coil group extends within a plane which is perpendicular to the through sections is greater than in the case where all of the coils are provided in a single through section. The surface area which is not covered by the magnetic body cores of the platelike members increases. In cases where the surface area of the members is large, the heat radiation characteristic is enhanced. Hence, the cooling efficiency of the transformer improves. In cases where there is a plurality of coil groups which are magnetically coupled to one another in particular, because it is difficult to move the heat produced in the plurality of coil groups through heat conduction, heat transfer, or heat radiation, a heat radiation structure of this kind is effective.

Abstract: A variable frequency transformer including: a first parallel circuit including at least two of the rotary transformers arranged in parallel and having an isolating circuit breaker connected to a rotor winding of each of the rotary transformers, and a separate synchronizing circuit breaker connected to a stator winding in each of the rotary transformers in the first parallel circuit; a first main transformer having a first winding connectable to a first power grid and a secondary winding connectable to the isolating circuit breaker in the first parallel circuit; a second main transformer having a first winding connectable to a second power grid and a secondary winding connectable to each of the synchronizing circuit breakers in the first parallel circuit, and a control system operatively connected to each of the synchronizing circuit breakers, the isolating circuit breakers and the drive motors for each of the rotary transformers.

Abstract: The present invention provides a radio frequency (RF) power supply in a mass spectrometer. The power supply provides an RF signal to electrodes of a storage device to create a trapping field. The RF field is usually collapsed prior to ion ejection. In an illustrative embodiment the RF power supply includes a RF signal supply; a coil arranged to receive the signal provided by the RF signal supply and to provide an output RF signal for supply to electrodes of an ion storage device; and a shunt including a switch operative to switch between a first open position and a second closed position in which the shunt shorts the coil output.

Abstract: Sensor for measuring electrical parameters in a high voltage environment comprising a high voltage side (4) for connection to high voltage conductors, a low voltage side (6) for connection to low voltage power supply and measurement signal control circuitry, a measurement signal circuit (16), and a power supply circuit (14), and at least one isolating transformer (18, 20) for transmission of electrical power supply and/or measurement signals between the low voltage side and the high voltage side. The isolating transformer comprises at least a first and a second transformer core (28), a transformer coil (33) on a circuit board around a branch (27) of the transformer core on the high voltage side and a transformer coil (32) on a circuit board around a branch (29) of the transformer core on the low voltage side, the isolating transformer further comprising an intermediate coil (36) encircling at least one branch of each said at least two transformer cores.

Abstract: A power conversion system comprises: a source of multiphase high frequency alternating current (AC) electrical input power; a high frequency controlled magnetics transformer for each phase of the multiphase high frequency AC input power, with each transformer having a primary winding coupled to its respective phase of the multiphase high frequency AC input power, at least one secondary winding that produces high frequency AC output power and at least one control winding responsive to a direct current (DC) control signal that changes the high frequency output power in proportion to the amplitude of the DC control signal; a power converter that receives the multiphase high frequency AC output power from each high frequency transformer secondary and converts it to system output power without the high frequency AC content; and a system controller responsive to the system output power that produces a DC control signal for each control winding that changes in amplitude in response to changes in a measured parameter

Abstract: A variable frequency transformer including: a first parallel circuit including at least two of the rotary transformers arranged in parallel and having an isolating circuit breaker connected to a rotor winding of each of the rotary transformers, and a separate synchronizing circuit breaker connected to a stator winding in each of the rotary transformers in the first parallel circuit; a first main transformer having a first winding connectable to a first power grid and a secondary winding connectable to the isolating circuit breaker in the first parallel circuit; a second main transformer having a first winding connectable to a second power grid and a secondary winding connectable to each of the synchronizing circuit breakers in the first parallel circuit, and a control system operatively connected to each of the synchronizing circuit breakers, the isolating circuit breakers and the drive motors for each of the rotary transformers.

Abstract: A discharging device capable of realizing a proper PWM drive by accurately reflecting, as a strobe device, the secondary-side condition of a separately-excited strobe charging circuit being charged. A charging device which charges a main capacitor (2) via a separately-excited DC/DC converter and discharges the energy of the main capacitor, wherein a pulse width control circuit (1) for controlling a conduction pulse width on the primary side of the separately-excited DC/DC converter is provided, and this pulse width control circuit is configured such that a PWM soft start drive is performed that expands a conduction pulse width on the primary side of the separately-excited DC/DC converter stepwise up to a maximum pulse width.

Abstract: A ballast circuit that facilitates providing thermal protection for a fluorescent lamp includes a coupling transformer that couples an inverter circuit to a control circuit. First and second transformer windings in the inverter circuit, and a third transformer winding in the control circuit, are wound around a common ferrite core. The ferrite core has a Curie temperature that approximates a maximum allowable threshold temperature for the lamp. When the temperature of the ballast approaches the Curie temperature of the ferrite core, its permeability, and thus inductance, drops dramatically, causing an increase in operating frequency in the inverter circuit. This increased operating frequency causes a capacitor in the control circuit to charge to a threshold voltage, at which power to the inverter circuit is reduced. The lamp then dims without turning off until the temperature is reduced to an acceptable level.

Abstract: A technique capable of improving speed of a set operation, which controls writing rate in a semiconductor device including a memory cell using a phase-change material. The technique uses means for setting a set-pulse voltage to be applied to the phase-change material to have two steps: the first-step voltage sets a temperature of the phase-change memory to a temperature at which the fastest nucleation is obtained; and the second pulse sets the temperature to a temperature at which the fastest crystal growth is obtained, thereby obtaining solid-phase growth of the phase-change material without melting. Moreover, the technique uses means for controlling the two-step voltage applied to the phase-change memory by a two-step voltage applied to a word line capable of reducing the drain current variation.

Abstract: A power conversion system comprises: a source of multiphase high frequency alternating current (AC) electrical input power; a high frequency controlled magnetics transformer for each phase of the multiphase high frequency AC input power, with each transformer having a primary winding coupled to its respective phase of the multiphase high frequency AC input power, at least one secondary winding that produces high frequency AC output power and at least one control winding responsive to a direct current (DC) control signal that changes the high frequency output power in proportion to the amplitude of the DC control signal; a power converter that receives the multiphase high frequency AC output power from each high frequency transformer secondary and converts it to system output power without the high frequency AC content; and a system controller responsive to the system output power that produces a DC control signal for each control winding that changes in amplitude in response to changes in a measured parameter

Abstract: Disclosed are methods, systems, and devices that include a power source having a first voltage having a first frequency, a power-consuming load(s), and a first transformer set comprising a delta-delta transformer and a first voltage controller coupled in series thereto, an input coupled to the power source, producing as output a second voltage having a second frequency and coupled to the power-consuming load(s). Also, a second transformer set has a wye-delta transformer, and a second voltage controller coupled in series thereto, an input is coupled to the power source, producing a phase-shifted third voltage output at a third frequency that is coupled to the power-consuming load(s). The first and second transformer sets are coupled in a parallel configuration such that the second and third voltage signals combine to produce a fourth voltage signal having a fourth frequency.

Abstract: A three-phase AC to AC frequency converter has a transformer with a three-phase input and n sets of three-phase secondary outputs, where n is three or more, the voltages at each set of secondary output terminals being one or more multiples of 360°/n out of phase with the voltages at the other sets of secondary output terminals. The sets of secondary output terminals are connected to three single pole, n throw switches, the poles of which are connected to the three output terminals of the frequency converter. Each switch may have n semiconductor switching devices, each connected to the common pole and separately connected to one of the output terminals in each of the sets of secondary output terminals.

Abstract: A step up transformer has an inert core, primary windings concentrically surrounding the inert core, and secondary windings concentrically surrounding the primary windings, the ratio of secondary windings to primary windings of up to 1,000,000:1. The step-up transformer is particularly useful in an x-ray catheter having an x-ray source in a vacuum tube and a power source. The power source can deliver a lower voltage which is stepped up at by the transformer to produce a voltage sufficient to stimulate production of x-rays by the x-ray emitter source. Methods for preparing the step-up transformer and x-ray catheter and methods of administering x-rays to subjects with the x-ray catheter of the invention are also disclosed.

Abstract: A system for transferring power between a first electrical system and a second electrical system comprises a rotary transformer (105) comprising a rotor (110) having rotor windings and a stator (112) having stator windings. The windings of at least one of the rotor and the stator are high power cables utilized to obviate employment of a transformer between the one of the rotor and the stator and one of the first electrical system and the second electrical system.

Abstract: A step up transformer has an inert core, primary windings concentrically surrounding the inert core, and secondary windings concentrically surrounding the primary windings, the ratio of secondary windings to primary windings of up to 1,000,000:1. The step-up transformer is particularly useful in an x-ray catheter having an x-ray source in a vacuum tube and a power source. The power source can deliver a lower voltage which is stepped up at by the transformer to produce a voltage sufficient to stimulate production of x-rays by the x-ray emitter source. Methods for preparing the step-up transformer and x-ray catheter and methods of administering x-rays to subjects with the x-ray catheter of the invention are also disclosed.

Abstract: A circuit arrangement for converting electrical energy has a static frequency converter which operates with a considerably higher frequency than the frequency to be produced, the arrangement has a heavy-duty switch, a transmitter and a rectifier on the secondary side, and a master control circuit, a regulating circuit and an auxiliary static frequency converter. The heavy-duty switches on the primary side and on the secondary side are provided for the two current directions with one transformer winding of a common transformer, and are also provided with filter sections for the low frequency range and high frequency range auxiliary frequency converters. The arrangement also is provided with quadrant shift locks at the primary side and the secondary side which determine the mode of operation of the static frequency converter in conjunction with the master circuit and the regulating circuit, whereby the output flow direction can be selected or is determined by a monitoring circuit.

Abstract: Apparatus for conversion of alternating current at a first frequency to alternating current at a second (lower) frequency in a power control circuit by means of progressive variation of magnetic flux in associated magnetic paths. Control is achieved by progressive saturation or domain rotation for selected portions of the magnetic paths to yield a uniformly controllable permeance within the magnetic paths. Feedback circuits provide a means for external control of the output in combination with a reference source.

Abstract: Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. The arrangement lends itself to simple construction and provides a mixer which is smaller than heretofore possible and which exhibits exceptional high frequency response and flatness with satisfactory isolation.