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9019734 Solid state switch gate firing with phase shift delay line  
A gate firing phase shift delay line technique is described for use in DC motor drive systems and is easily adaptable for controlling a plurality of electronically coupled power modules. A drive...
8923026 Power conversion circuits  
According to one embodiment, an AC power system includes a first AC/DC converter to be coupled to a direct current (DC) load and a multi-phase AC power supply. The system further includes a second...
8902621 Power supply device for use with selectable AC power supply voltage  
A power supply device that is able to switch between rectifier circuits in accordance with the voltage of a multi-phase AC power supply, and able to accommodate different power supply voltages....
8848406 Single-phase voltage type AC/DC converter, three-phase voltage type AC/DC converter, and stabilization control method  
A method and a single-phase voltage type AC/DC converting device and a three-phase voltage type AC/DC converting device arranged between a load and a distribution network. The converting devices...
8792261 Power conversion device  
A power conversion device connected with a three-phase power system through a transformer, including unit converters cascade-connected so that reactors are unnecessary, and volume and weight are...
8681521 Voltage regulator  
Provided are improvements for systems and methods of alternating current (AC) to direct current (DC) power regulation. The system improvements include a regulation circuit having a microprocessor...
8553440 Power conversion circuits  
According to one embodiment, an AC power system includes a first AC/DC converter to be coupled to a direct current (DC) load and a multi-phase AC power supply. The system further includes a second...
8289736 Conversion of AC lines to HVDC lines  
An electric power transmission system includes at each end of a high voltage direct current transmission line including three conductors, a converter station for conversion of an alternating...
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...
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...
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...
8054657 Static converter  
A static converter includes a current converter on the three-phase side and a current converter on the single-phase side, which are electrically conductively linked to one another on the DC...
7834793 Self-timed clocked analog to digital converter  
An SAR analog-to-digital converter performs bit decisions in each of a plurality of clock cycles. A sense circuit monitors signals input to a latch within a comparator of the ADC and, when the...
7729145 Power converter and method, and triangle wave generating circuit  
A power converter that converts an AC power outputted from a generator into a DC power and supplies it to a battery (load). The power converter includes a thyristor (switch unit) connected between...
7719858 Fifteen-phase autotransformer  
A polygon connected three-phase autotransformer using nine windings per phase provides a reduced power rating fifteen-phase power source suitable for 30-pulse AC to DC power converters. The...
7715215 Control of an AC-to-DC power supply assembly fed by a three-phase AC source  
Control of an AC-to-DC power supply assembly fed by a three-phase AC source is provided by: determining whether the power supply assembly includes greater than three single-phase power regulators...
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...
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....
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)...
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...
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...
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)...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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.
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...
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...
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...
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....
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...
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...
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...
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...

Matches 1 - 50 out of 186 1 2 3 4 >