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| Number | Title | Issue Date |
| 7443129 | Quenching device for a converter bridge with line regeneration There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-ph... | 10/28/2008 |
| 7362597 | AC voltage generating apparatus and motive power outputting apparatus A motive power outputting apparatus includes motor generators, inverters, and a transformer. The motor generator includes a three-phase coil, and the motor generator includes a three-phase coil. The inverter allows an in-phase AC current to pass through an U-phase c... | 04/22/2008 |
| 7167035 | Delay circuitry and method therefor One use for delay adjustment circuit (32), coarse-grain delay offset circuit (34), and fine-grain delay synthesis circuit (36) may be as part of a delay replication circuit (30) used to replicate the frequency versus voltage behavior of a... | 01/23/2007 |
| 7164998 | Method for determining programmable coefficients to replicate frequency and supply voltage correlation in an integrated circuit One use for delay adjustment circuit (32), coarse-grain delay offset circuit (34), and fine grain delay systhesis circuit (36) may be as part of a delay replication circuit (30) used to replicate the frequency versus voltage behavior of a... | 01/16/2007 |
| 7030593 | Multiple path variable speed constant frequency device having automatic power path selection capability The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path... | 04/18/2006 |
| 6972976 | Compensation method for a voltage unbalance The invention relates to a method for compensating for a voltage unbalance in an electrical network, which is fed by using an apparatus based on controlling a flux linkage vector or a voltage vector. Concerning the apparatus based on controlling the flux linkage vec... | 12/06/2005 |
| 6778418 | Power-supply voltage frequency control circuit A power-supply voltage frequency control circuit capable of changing a clock frequency in accordance with processing and assuring an operation of a target circuit when supplying a power-supply voltage in accordance therewith, comprising a clock supply circuit capabl... | 08/17/2004 |
| 6552510 | Method for frequency converter A method for a frequency converter, when the frequency converter controls a motor and operates torque-controlled partly or entirely in a field weakening region. The method comprises the steps of defining the direction of travel and sector of a stator flux... | 04/22/2003 |
| 6437302 | Interruptible variable frequency power supply and load matching circuit, and method of design A load matching circuit is disclosed for use with a frequency controlled power supply. The load matching circuit includes an input connectable to the frequency controlled power supply and an output connectable to the load, such as an induction heating coi... | 08/20/2002 |
| 6343021 | Universal input/output power supply with inherent near unity power factor An electronic method and apparatus are described for an isolated, universal input, power supply in the form of a single-ended resonant converter that utilizes capacitive energy storage versus magnetic energy storage, for converting an ac or DC input volta... | 01/29/2002 |
| 6222862 | Control method of exciting a pulse laser and power supply unit for exciting a pulse laser A power supply unit provides therein a first power unit outputting a first excitation amplitude and operating from rising of a reference pulse signal outputted from a reference oscillator until rising of a first time delay signal having a time delay to th... | 04/24/2001 |
| 5898579 | Non-contact power distribution system An inductively coupled power distribution system for moving vehicles, in which resonating primary circuits to distribute power for resonating secondary circuits to collect and use in an optimized manner. In order to have all circuits resonating at substan... | 04/27/1999 |
| 5627744 | Converter enhanced variable frequency power bus architecture An electric power generation and distribution system having a basic variable frequency distribution bus to which wide frequency variation tolerant utilization equipment is coupled and an enhanced frequency distribution bus to which wide frequency variatio... | 05/06/1997 |
| 5402054 | Variable speed AC drive control A method for controlling the speed of an AC machine (12) is described. The AC machine (12) receives three output phases (A,B,C) supplied from a cycloconverter (10) which is connected to an input supply (R,Y,B) of frequency f1. The cycloconverter (10... | 03/28/1995 |
| 5317500 | Active no-break power transfer control for a VSCF power generating system An improvement in a control for a DC link power converter includes a phase command signal generator responsive to DC power on a DC link wherein the phase command signal generator develops a phase command signal for a control of the power converter whereby... | 05/31/1994 |
| 5155466 | Automatic frequency control system An automatic frequency control system applicable to home automation system and electronic appliances requiring precise frequency, comprising a resonance transmitter, a carrier transmitter, a frequency detector, highest and lowest limit oscillators for gen... | 10/13/1992 |
| 4905134 | Paralleling method and control for a VSCF system Prior variable speed constant frequency (VSCF) system controls which operate the VSCF system while it is coupled in parallel with an external AC source across a load have controlled inverter output voltage based only upon the reactive current level suppli... | 02/27/1990 |
| 4894766 | Power supply frequency converter The present invention achieves the above objects, among others, by providing apparatus for converting a supplied AC input signal into an AC output signal having a selected lower frequency than the frequency of the AC input signal, which apparatus translat... | 01/16/1990 |
| 4811193 | Variable frequency controller A circuit for operating an electromagnet of a feeder or vibrator incorporate phase control for a triac used for oscillating the feeder at line frequency or at a selectable subharmonic frequency.... | 03/07/1989 |
| 4808842 | Dual voltage generator system A system for providing a regulated low voltage DC source and a regulated higher voltage AC source at a preselected frequency, such as 60 Hz. from the same windings of an alternator rotated at variable speeds including a phase WYE connected engine driven a... | 02/28/1989 |
| 4772994 | Power source using high-frequency phase control A power source using high-frequency phase control possessing an ability to cause the transfer of electric power between a power source side and a load side to be made through a high-frequency transformer and to effect control of the output voltage by subj... | 09/20/1988 |
| 4766327 | Circuit and method for synchronizing power sources in a parallel AC electrical power system Power sources of a parallel AC electrical power system are synchronized by producing a voltage difference signal representative of the difference in output voltages of the power sources and demodulating that signal to produce a frequency control signal an... | 08/23/1988 |
| 4641040 | Low-head hydroelectric installation Low-head hydroelectric installation, in particular for a tidal power station, intended to operate under variable heads of water that can fall to values in the region of zero. When the head of water is lower than a defined value (Hd), lower than at least h... | 02/03/1987 |
| 4590548 | A.C. supply converter A direct a.c. supply converter for converting an N (ࣙ2) phase input voltage system into an a.c. output voltage system of different frequency, amplitude, and/or phase using width-modulated contributions from the phases of the input voltage system to prod... | 05/20/1986 |
| 4581696 | Control method and apparatus for a UFC for minimizing input current distortions In a pulse-width modulated unrestricted frequency changer (UFC) the harmonic contents of the input current are minimized by splitting the active time intervals within the fundamental time frame into at least two pulses which are located within such time f... | 04/08/1986 |
| 4578746 | Interlaced pulse-width modulated unrestricted frequency changer system In a static frequency changer controlled by adjusting the time of conduction of the bilateral switching units forming static converters, the time of conduction is split into n time intervals of respective subdurations adding up to be equivalent to the eff... | 03/25/1986 |
| 4510399 | Demodulator circuit for parallel AC power systems A demodulator circuit utilizes a switching demodulation technique to detect the real and reactive components of load current unbalance in a parallel source alternating current power system. A signal representing load current unbalance is selectively switc... | 04/09/1985 |
| 4488215 | Method and apparatus for controlling the load current of a pulsed frequency converter A system for forming address signals which address respective converter switches in a frequency converter. The frequency converter is of the type wherein a DC voltage is provided for supplying electrical energy to phase outputs thereof in response to the ... | 12/11/1984 |
| 4480301 | Method and apparatus for controlling a pulsed frequency converter A system for forming addressing signals for addressing respective converter switches of a frequency converter; the frequency converter being of the type which is provided with DC input terminals for receiving electrical energy which is conducted to phase ... | 10/30/1984 |
| 4352155 | Variable speed constant frequency power converter with two modes of operation When the input frequency is below a preselected value, an unrestricted frequency changer (UFC) is operated in the conventional manner by sequentially switching to more positive input phases while the fundamental component of the output waveform is positiv... | 09/28/1982 |
| 4147910 | Power adjustment with variable frequency and duty-cycle control for induction heating apparatus In an induction heating cooking apparatus, the frequency of electromagnetic energy is varied in response to a desired power setting level within an allowable range and the duty cycle of the energy is varied in response to the setting level while the frequ... | 04/03/1979 |
| 4038592 | Voltage and frequency control circuit A voltage and frequency control circuit converts an alternating current input signal with inconstant frequency and voltage amplitude to an alternating current output signal with constant voltage amplitude and a constant nominal frequency which is lower th... | 07/26/1977 |
| 3989998 | Wide range pulse generator A pulse generator for generating pulses over a wide range without changing scales is disclosed. The pulse generator is capable of generating pulses in the range from 0.5 Hz to greater than 2 MHz in one continuous range. The wide range of operation is achi... | 11/02/1976 |
| 3982167 | Current control system for high frequency link cycloconverter In a system including an input cycloconverter which operates a high frequency resonant tank from a source of low frequency voltage supplied through a reactor, with or without an output cycloconverter, an input cycloconverter control circuit and method ind... | 09/21/1976 |
