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| Number | Title | Issue Date |
| 4600874 | Excitation current control for induction motor drive using load commutated inverter circuit A system for controlling the operation of an alternating current induction motor having windings supplied by electrical power from the polyphase alternating current source includes a load commutated inverter circuit which is connected between the power so... | 07/15/1986 |
| 4598350 | Power converter control apparatus and power converter control method A power converter control apparatus includes an automatic power controller for controlling a rectifier and an automatic reactive power controller for controlling an inverter. The inverter is coupled via DC power transmission lines to the rectifier. An out... | 07/01/1986 |
| 4595975 | Efficient power supply suitable for inductive loads Disclosed is an Electrical Driving and Recovery System for a High Frequency environment. The recovery system can be applied to drive present day direct-current or alternating-current loads for better efficiency. It has a low-voltage source coupled to a vi... | 06/17/1986 |
| 4570214 | Reactive power control cycloconverter A reactive power control cycloconverter for three-phase AC is provided with a reactive power source coupled to power lines of the three-phase AC, a three-phase cycloconverter unit for converting three-phase input power from the power lines into three-phas... | 02/11/1986 |
| 4555752 | AC Power converter with commutation circuit for reducing reactive power A power converter utilizes first and second thyristor bridges energized by two AC power sources which are insulated from each other. The power converter includes first and second auxiliary thyristor circuits each containing plural thyristors, and a commut... | 11/26/1985 |
| 4529925 | Reactive power compensating cycloconverter A power control apparatus which includes a cycloconverter having thyristors in which a circulating current flows, for supplying a compensating current to AC power lines; capacitors for supplying a reactive current component of the compensating current to ... | 07/16/1985 |
| 4527102 | Drive system for a DC motor with reduced power loss A high power efficiency drive system for a DC motor which controls the supply of power to polyphase coils has a DC-DC switching converter for changing an output voltage according to an ON-time ratio of the switching transistor, and a switching controller ... | 07/02/1985 |
| 4496899 | Control for a force commutated current source var generator The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The f... | 01/29/1985 |
| 4418380 | Method and apparatus for controlling the circulating current of a cycloconverter A circulating current of a cycloconverter in each phase is distributed and controlled in such a way that a circulating current in a phase having a large absolute value of a load current is small, and the circulating current of a phase having a small absol... | 11/29/1983 |
| 4410807 | Regulating device for polyphase electrical circuits A regulating device for a polyphase electrical circuit, having a motor with windings corresponding to the main supply lines for the circuit. Leads are connected to each of the windings and contain a relatively low m.f.d. capacitor for suppressing spikes a... | 10/18/1983 |
| 4352156 | AC to AC Power converter with a controllable power factor The input power factor of an AC to AC static power converter is continuously adjustable between a maximum leading or lagging phase angle, determined by the load power factor, through rapidly transferring between conventional and complementary unrestricted... | 09/28/1982 |
| 4349867 | Control apparatus for a cycloconverter A control apparatus for a cycloconverter includes m sets of bridge converters connected between the input terminals of an m-phase load (mࣙ3) and is applied for a cycloconverter of which the common connection point of the bridge converters is disconnecte... | 09/14/1982 |
| 4348630 | Superconducting VAR control Static VAR control means employing an asymmetrically controlled Graetz bridge and a superconducting direct current coil having low losses and low cost characteristics.... | 09/07/1982 |
| 4316125 | Power supply for a flash tube First and second rectifiers (37), (41) have inputs connected to an A.C. power source (12) through a unitary switch (33) and outputs connected to first and second smoothing filters (38), (42) respectively. An inductance (39) is connected between the switch... | 02/16/1982 |
| 4307442 | Transmission line interconnecting system A transmission line interconnecting system including an AC-DC converter connected to a first transmission line; and a forced-commutated type inverter connected to a second transmission line. DC terminals of the AC-DC converters and the forced commutated t... | 12/22/1981 |
| 4306283 | Power factor improving apparatus for power converter The two secondary windings of a transformer the primary winding of which is connected to an AC power supply are each provided with a controlled rectifying circuit. The DC sides of the rectifying circuits are connected in series to supply power to DC motor... | 12/15/1981 |
| 4039926 | Current fed inverter with commutation independent of load inductance A three phase bridge inverter supplies rectangular wave currents to an inductive load and to capacitors connected in wye across the load for wave shaping as well as filtering and power factor correction. A commutating capacitor connected to the midpoint o... | 08/02/1977 |
| 4019124 | Apparatus for compensating reactive power in a three-phase network An apparatus for compensating for the reactive power in a three-phase network. The apparatus includes an uncontrolled rectifier, an intermediate DC link connected to the rectifier, and a self-commutating inverter connected to the DC link and controlled so... | 04/19/1977 |
| 4013937 | Naturally commutated cycloconverter with controlled input displacement power factor A naturally commutated cycloconverter having at the input a source of higher frequency than at its output is used as a static reactive power generator to correct displacement angle in an alternating current power system when coupled thereto at the output.... | 03/22/1977 |
| 4009433 | Method and apparatus for compensating reactive power An arrangement for compensating reactive power in a three phase network using two converters with the same no load d-c voltage in which the two converters are coupled in parallel on the d-c side and shorted by a common choke with the one converter operate... | 02/22/1977 |
| 4001670 | Static reactive power generating apparatus An AC/AC frequency changer operating under a one to one frequency ratio has its input coupled to a power system of same frequency and voltage, with an inductor connected between its output and input terminals. The output voltage is controlled so as to dev... | 01/04/1977 |
| 3968422 | Method and apparatus for the static compensation of reactive power A method and apparatus for the static compensation of reactive power using controlled reactive power converters having control variables derived from the phase load currents in which the phase load currents are converted into a line frequency oscillation ... | 07/06/1976 |
| 3959720 | Voltage control system for high frequency link cycloconverter In a system including an input cycloconverter which operates a high frequency resonant tank circuit from a source of low frequency voltage supplied through an input reactor, with or without an output cycloconverter, an input cycloconverter control method ... | 05/25/1976 |
| 3959719 | Static controller for power factor correction and adaptive filtering A polyphase cycloconverter operating in regenerative mode is connected between a voltage distribution system and a single phase high frequency resonant tank and controlled to produce essentially no real power flow to the resonant tank and a variable amoun... | 05/25/1976 |
| 3932799 | Peak load levelling system A load levelling system for connection to an alternating current network includes an electro-chemical direct current source and line-commutated controllable convertor means having DC terminals connected to the supply source and AC terminals for connection... | 01/13/1976 |
