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"What, sir, would you make a ship sail against the wind and currents by lighting a bonfire under her deck? I pray you, excuse me, I have not the time to listen to such nonsense."
Napoleon Bonaparte ; When told of the Robert Fulton steamboat
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| Number | Title | Issue Date |
| 8154895 | Method and apparatus for DC bus capacitor pre-charge A method and apparatus for converting three phase AC voltages on first, second and third input lines to DC voltage across positive and negative DC buses, the apparatus comprising a rectifier including first, second and third rectifier legs, each leg including a swit... | 04/10/2012 |
| 8154896 | STATCOM system for providing reactive and/or active power to a power network A static compensator system for providing reactive and/or active power to a power network. The system includes a static compensator, which has a DC capacitor Ud and a voltage source converter. The static compensator is connected to an energy storage devic... | 04/10/2012 |
| 8149604 | Method of controlling a rectifying bridge and a circuit for the control A circuit for controlling a thyristor (V1) into conducting state, the thyristor (V1) being in a rectifier, which rectifier is adapted to supply DC voltage to a DC voltage circuit. The circuit comprises a pulse transformer (T1), means for generat... | 04/03/2012 |
| 7236380 | Rectifier system having different rectifier elements A rectifier system, in particular a rectifier bridge for a three-phase generator, includes a plurality of rectifier elements, specifiable rectifier elements being different from the other rectifier elements in at least one property. The rectifier elements are, for e... | 06/26/2007 |
| 7233506 | Low kVA/kW transformers for AC to DC multipulse converters A polygon connected autotransformer in conjunction with zero sequence blocking inductor(s) enables multipulse AC to DC converters to use lower kVA parts rating by using appropriate phase-shifted voltage sets in conjunction with inductors that extend the conduction p... | 06/19/2007 |
| 7175588 | Method and system for detecting ventricular collapse A pump system includes an implantable pump including a motor having a rotor and a stator. The stator includes a plurality of stator windings, and a motor controller is coupled to the motor to energize the windings so as cause the rotor to turn. A time-based system p... | 02/13/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 7082041 | Power supply filtering A power supply is filtered while the amount of in-rush current required by the capacitive charging of the filter is limited. A resistor may be placed in parallel with a relay where the parallel combination is in series with the filtering capacitor. The relay is open... | 07/25/2006 |
| 6650557 | 18-pulse rectification system using a wye-connected autotransformer An electrical AC-DC power conversion system featuring 18-pulse rectification and utilizing a low weight wye-connected phase shifting autotransformer (500) supplied from a 3-phase AC source (40) through a 3-phase line reactor (41). The current harmonic dis... | 11/18/2003 |
| 6594164 | PWM controlled power conversion device A power conversion device according to the invention of the present application includes: an active current controller that calculates a phase angle reference value for determining the ON/OFF phase with reference to the AC power source voltage phase, from... | 07/15/2003 |
| 6535404 | Controlling operation of an AC/DC converter An AC/DC converter has an auxiliary control system which attenuates or suppresses an unwanted or non-characteristic harmonic component (such as a 3rd harmonic component) of voltage in an AC power system caused by operation of the converter. The... | 03/18/2003 |
| 6459599 | Determining phase of AC mains in PWM controlled converters without voltage sensors In a pulse width modulation-controlled, switched bridge, DC converter, the phase angle (44, 45) of the AC mains (4) is provided without sensing the voltage thereof, by a phase-locked loop (47) having one input (75) derived (126) from the in-phase voltage ... | 10/01/2002 |
| 6442051 | Full thyristor bridge circuit with free wheeling diode for de-excitation control and stability sensing A circuit is provided for use in a synchronous generator excitation system. The circuit comprises a three-phase bridge having six legs. The bridge is connected with an AC power supply. A thyristor is provided in each of the six legs, wherein the thyristor... | 08/27/2002 |
| 6421259 | Modular DC distribution system for providing flexible power conversion scalability within a power backplane between an AC source and low voltage DC outputs A modular DC power distribution system. A physically discrete input conversion module is utilized for converting a source AC signal to a high voltage DC signal. Multiple universal mounting sites are provided in a power supply backplane for engaging one or... | 07/16/2002 |
| 6411529 | Control for power plant A plant for transmitting electric power which employs a first combination of a turn off semiconductor and controllable semiconductor connected in antiparallel and a second combination of a turn off semiconductor and antiparallel wherein the first combinat... | 06/25/2002 |
| 6337801 | Three-phase zero-current-transition (ZCT) inverters and rectifiers with three auxiliary switches Zero current transition (ZCT) topologies are presented for three-phase inverters and rectifiers. Such devices are used for example in AC adjustable speed drives for so-called zero-emission vehicles (i.e., electric and hybrid combustion/electric automobile... | 01/08/2002 |
| 6067242 | Current balanced arms of AC/DC bridge rectifiers A power converter comprises parallel circuits by providing two series circuits composed by self-arc-suppressing semiconductors, reactors and diodes. Moreover, unbalance of the currents flowing in the two parallel circuits is prevented by connecting the te... | 05/23/2000 |
| 6038155 | Three phase SCR rectifier bridge with soft start control IC A soft start circuit for controlling a rectifier circuit, the rectifier circuit for converting power from an AC source having one or more phases to DC power having an output voltage (Vo) from a Vo+ node to a Vo- node, the rectifier circuit including: (i) ... | 03/14/2000 |
| 5963440 | Controlled three-phase rectifier with current comparison between rectifier segments A parallel array of a plurality of controlled rectifier bridges for converting multi-phase AC current to DC. Each bridge includes a plurality of rectifier segments. One segment for each polarity of each phase of current. A sensor monitors the current and ... | 10/05/1999 |
| 5793622 | Common turn-off circuit for a thyristor power converter A common turn-off circuit for a thyristor power converter is specified. The common turn-off circuit is particularly suitable for AC converters such as, for example, railway grid couplings. The turn-off thyristors are directly connected to the secondary tr... | 08/11/1998 |
| 5717586 | Single winding power converter The present invention provides smooth conversion of electric power between an AC line operating at a first voltage and a DC line operating at a second voltage bearing a fixed ratio to the first voltage. In one embodiment, polyphase AC is converted to ripp... | 02/10/1998 |
| 5644485 | Converter connection with a balancing circuit A converter connection for conversion between alternating voltage and direct voltage, for connection to a power network (DCN) having a neutral pole (P0) and at least one pole (P+,P-) energized by direct voltage in relation to the neutral pole, comprises a... | 07/01/1997 |
| 5541830 | Aerospace DC power supply having neutral point controller Dc aerospace power supplies include neutral point controllers to interconnect primary or secondary windings of the supplies into wye connected primary or secondary circuits. In power supplies having neutral point controllers in the primary circuits, the p... | 07/30/1996 |
| 5483435 | Power generation system having induction generator and controlled bridge rectifier A power generation system is constituted by an induction generator and a converter. An output current waveform of the induction generator is determined by the magnetic flux, speed, winding impedance, DC output voltage, and load of the induction generator.... | 01/09/1996 |
| 5455759 | Symmetrical, phase-shifting, fork transformer In 12-pulse and 18-pulse AC/DC converter systems a single wye connected auto transformer using appropriate segments of voltage from each phase connected in fork fashion is used to develop 6-phase and 9-phase voltages in a symmetrical manner such that inhe... | 10/03/1995 |
| 5355294 | Unity power factor control for dual active bridge converter A dual active bridge converter, including high-frequency transformer-coupled input and output bridge converters, receives a rectified ac line voltage via a rectifier acting in a resistive mode and a small, high-frequency filter capacitor. A phase angle co... | 10/11/1994 |
| 5311419 | Polyphase AC/DC converter A power converter for converting input AC power comprising N phase-to-phase input AC waveforms at a first frequency into overall output DC power, where N is an integer greater than two, includes N phase-to-phase AC/DC converters each receiving a phase-to-... | 05/10/1994 |
| 5287260 | GTO rectifier and inverter A power converting apparatus controls switching of self turn-off type semiconductor devices so as to perform power conversion. The apparatus comprises a plurality of switch units each having first and second self turn-off type semiconductor devices, first... | 02/15/1994 |
| 5267137 | High-power power supply The invention concerns a high power power supply with output power in excess of 5 kilowatts, by way of example, for the supply of electromagnets in the area of electromedicine and nuclear physics. In order to regulate the output current, power thyristors ... | 11/30/1993 |
| 5265002 | Fault protection for a multiphase bridge power converter A semiconductor power conversion system comprising a multiphase bridge circuit which includes semiconductor devices having a controllable firing function and a reverse blocking characteristic, a gate control circuit which gives firing commands to the semi... | 11/23/1993 |
| 5179510 | Power converting apparatus capable of suppressing a fault current A power converting apparatus comprises self-commutated converter, fault current restricting device, fault detector, and cutoff circuit. Self-commutated converter converts AC power supplied from an AC power system into DC power and supplying the DC power t... | 01/12/1993 |
| 5148357 | Auto-connected hexagon transformer for a 12-pulse converter A 12-pulse converter of lower rating and minimal current harmonics is obtained with an auto-connected regular hexagon transformer including a delta winding in its center.... | 09/15/1992 |
| 5068774 | 24-pulse hexagon-type AC/DC static converter An AC/DC or DC/AC converter includes a single hexagon transformer with each side connected to opposite polarity DC terminals through two pairs of SCR devices gated in sequence synchronously with the frequency of the AC lines, gating in a pair lagging gati... | 11/26/1991 |
| 5051883 | Method and an apparatus for full wave rectification of a three-phase signal operating in a wye configuration A full wave rectification circuit for use with a three-phase input signal connected in a wye configuration for rectifying a line to neutral high input voltage is disclosed. The rectification circuit has two portions. A first portion generates a control si... | 09/24/1991 |
| 5027264 | Power conversion apparatus for DC/DC conversion using dual active bridges A DC/DC power converter suitable for high power applications has an input converter which converts the DC input voltage to an AC voltage and supplies this voltage to a transformer. The output of the transformer is provided to an output converter which con... | 06/25/1991 |
| 5023535 | High resolution pulse width modulation An electrohydraulic servo system in which a microprocessor-based controller directs a pulse width modulated control signal to a servo valve for controlling flow of hydraulic fluid therethrough. Duration of each half-cycle in the pulse width modulated cont... | 06/11/1991 |
| 5003455 | Circuitry and method for controlling the firing of a thyristor Circuitry and methods are provided for AC line synchronization of the firing means for phase-controlled thyristors in a DC motor speed control system. A line synchronization method and system is disclosed which eliminates zero offset in the phase command ... | 03/26/1991 |
| 4978442 | Magnetic separator having high rate of field change capability A large magnetic separator for separating magnetic fines from nonmagnetic product is equipped with a dual mode power supply. A first mode of the dual power supply is provided for accelerated imposition of the design magnetic field. A second mode of the du... | 12/18/1990 |
| 4928219 | Adaptable current regulating system An adaptable current regulating system provides a regulated current in accordance with both the actual characteristics of a system under control and the actual measured period of an AC supply. The system constantly monitors its status, and provides a mast... | 05/22/1990 |
| 4891741 | AC/DC converters A polyphase AC/DC converter, useful as a drive for a DC motor or in a power-sharing electrical power distribution system, comprises a naturally-commutated, phase-controlled, polyphase thyristor bridge and control determining the application of firing sign... | 01/02/1990 |
