|
Match
|
Document |
Document Title |
|
|
8159851 |
Matrix converter
A matrix converter includes a matrix converter main circuit, an input voltage detector group configured to detect an input voltage of an alternating current source, a gate driver configured to...
|
|
|
8027173 |
Apparatus for providing AC voltage
An apparatus for providing an AC voltage includes a synthesizer for generating at least one periodic output voltage signal, each periodic output voltage signal having an output frequency. The...
|
|
|
7821802 |
Control method for direct power converter
A power converter directly converting an AC voltage into an AC voltage of any desired magnitude and frequency by turning bidirectional switches ON and OFF without employing any energy buffer, where...
|
|
|
7710063 |
Electric power converter
An electric power converter, electric power conversion system and method that, without using a DC-DC converter, uses and allots the electric power of plural power sources while reducing the volume...
|
|
|
7626836 |
Method and apparatus for adjustable voltage/adjustable frequency inverter control
An apparatus and method for controlling an inverter, the apparatus including an adjustable frequency controller receiving a reference frequency value and generating a command frequency value as a...
|
|
|
7339809 |
Systems and methods for electrical power regulation and distribution in aircraft
The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an...
|
|
|
7332882 |
Motor drive device that combined charge controller
A voltage detector is connected to a connection terminal connected to one phase of an AC output of an inverter through a diode. A removable charge power supply is connected to said connection...
|
|
|
7280938 |
Method for determining a negative sequence component
The invention relates to a method for determining properties of a negative sequence component of a space vector quantity in an electrical network. The method according to the invention includes the...
|
|
|
7212421 |
Combination feedback controller and power regulator using same
A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the...
|
|
|
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...
|
|
|
6760239 |
Method for controlling a matrix converter
A method for controlling a matrix converter with nine bidirectional power switches arranged in a 3×3 switch matrix is described. Switching states of a modulation period are each calculated with ...
|
|
|
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...
|
|
|
6310901 |
Automated AC filament universal laser power controller in a gas ion laser system and method
A power supply is provided for use in a laser system including a gas ion laser tube which requires a filament voltage provided by an output section of the power supply. The filament voltage...
|
|
|
6018466 |
Electronic signal conditioner
An electronic signal conditioner (ESC) (10) that can be designed to operate a differential capacitive load (90) or a single-ended capacitive load (92). The ESC (10) is disclosed in four design...
|
|
|
5630155 |
Portable computer system with mechanism for accumulating mechanical energy for powering the system
An embodiment of the the present invention is a computer system comprised of a main computer circuit having an interruptible CPU, a control program stored in memory connected to the CPU with...
|
|
|
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...
|
|
|
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...
|
|
|
4858100 |
Electric power converter
An electric power converter, in which a plurality of converters convert a first electric power having a first frequency into a second electric power having a second frequency, and the second...
|
|
|
4777581 |
Modulation method and apparatus for static power frequency changers
The performance of the cycloconverter when used to drive an induction motor is at present limited because of inadequate methods of modulating the thyristor conduction angles. The main problems are:...
|
|
|
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...
|
|
|
4764859 |
Method and apparatus for controlling circulating-current type cycloconverter
A current-circulating cycloconverter includes a positive converter and a negative converter connected in anti-parallel with each other through a DC reactor. A load is connected to an intermediate...
|
|
|
4680695 |
Cross coupled current regulator
A current regulator for a variable frequency power supply includes a proportional plus integral circuit that produces a composite control output signal for each phase. To improve the performance of...
|
|
|
4675802 |
Three-phase-to-three-phase power converter
A 3-phase-to-3-phase power converter is intended to control the output voltage and current so as to provide a 3-phase sinusoidal wave which is controlled in compliance with the input voltage. The...
|
|
|
4658346 |
Apparatus for co-generation of electric power
Apparatus for converting relatively high, variable frequency, variable amplitude electrical power into substantially constant amplitude and substantially constant, relatively lower frequency power...
|
|
|
4648022 |
Matrix converter control system
A three-pulse UFC system uses three groups of three bilateral switches controlled according to a switch polarity pattern to generate AC currents to a load, and a deadband hysteresis having upper...
|
|
|
4639851 |
Method and apparatus for firing angle control of series connected thyristor switches
To eliminate thyristor failure due to voltage imbalance across series-connected thyristors during reverse voltage recovery caused by current discontinuity under continuous pulse application to the...
|
|
|
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 c...
|
|
|
4555755 |
AC Current control system
In an AC current control system for controlling multi-phase AC currents supplied from a power converter to a load, the currents are detected and coordinate-transformed into orthogonal two-axis...
|
|
|
4538220 |
Adjustable frequency AC motor drive using an unrestricted frequency changer system
In an unrestricted frequency changer (UFC) the control pulses are generated by the intersection of a reference ramp of controllable slope and frequency with a succession of timing ramps...
|
|
|
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...
|
|
|
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...
|
|
|
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 (m≥3) and is applied for a cycloconverter of which the c...
|
|
|
4225911 |
Apparatus and method for reducing overvoltage transients on the outputs of a VSCF system
An apparatus and method for reducing the overvoltage transients present on the alternating current power signals provided by the cycloconverters of a variable speed constant frequency (VSCF) system...
|
|
|
4012677 |
Speed control for electrically propelled traction vehicles
An electrical propulsion control system for self-propelled traction vehicles of the type having a prime mover-driven electric generator supplying energy to traction motors and regulating means for...
|
|
|
4008428 |
Circuit arrangement with a number of frequency converters, particularly Y-connected direct frequency converters
A circuit arrangement is disclosed having an odd number of Y-connected frequency converters. The control units of the frequency converters are associated with current regulators, all of which are...
|
|
|
3585485 |
NOVEL INTEGRAL FIRING ANGLE CONTROL FOR CONVERTERS
An improved method of firing angle control of thyristor type converters and particularly cycloconverters each of the component waveforms of the converter as well as the composite output waveform of...
|
|
|
3585486 |
AN ELECTRICAL CONVERTER SYSTEM EMPLOYING A CONTROL CONVERTER FOR CONTROLLING THE OPERATION OF A POWER CONVERTER
A converter system utilizing a control converter operated during both the positive and negative current half cycles of the output voltage to initiate firing pulses for a power converter which can...
|
|
|
3317811 |
Programmable frequency multiplied square wave power supply
|
|
|
3246231 |
Frequency conversion system utilizing controlled frequency feedback
|
|
|
3188550 |
Regulator for a frequency multiplier
|
|
|
3099784 |
Frequency multiplier
|
|
|
3093787 |
Electrical apparatus for producing a variable frequency
|