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7629786 |
Device for reducing harmonics in three-phase poly-wire power lines
The invention is a harmonics reduction device for three-phase poly-wire power lines, which can more reliably eradiate harmonics current applied to an electric power system via a neutral line. The...
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7616087 |
Installation for transmission of electric power
An installation for transmission of electric power via a high-voltage ac voltage line between two switchgear units located at a large distance from each other. For the transmission of the electric...
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7609535 |
Method and apparatus for providing input EMI filtering in power supplies
A power supply electromagnetic interference (EMI) filter circuit and technique. In one embodiment, a method of filtering EMI in a power supply includes rectifying an AC signal from an AC source,...
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7535125 |
Single-phase filter for reducing harmonics
A harmonic current filter includes a first and second power system connectors and first and second load connectors, wherein the second power system connector is directly connected to the second...
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7485987 |
Power converting device
A power converting device includes a single-phase multiplex converter used as an active filter and a control device. The single-phase multiplex converter includes multiple single-phase inverters...
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7465872 |
Photovoltaic power converter system with a controller configured to actively compensate load harmonics
Photovoltaic power converter system including a controller configured to reduce load harmonics is provided. The system comprises a photovoltaic array and an inverter electrically coupled to the...
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7453330 |
Line filter
A line filter has a filter unit, which has an input and an output and also a current-compensated choke and a capacitance network. The choke has several phase windings on a common core. Each phase...
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7449799 |
Harmonic mitigating device with magnetic shunt
A harmonic mitigating device for connection between a power distribution system and the load uses a magnetic shunt to control the levels of magnetic coupling between different elements of the...
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7446436 |
Waveform correction filters
A number of wave correction filters are disclosed which respond to power surges or spikes outside the intended frequency and/or voltage for a load device. The circuits respond to such undesired...
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7446435 |
Power converter system and method
A power system for providing an output power to a load is provided. The system comprises a generator configured to generate an alternating current input power and an power converter system coupled...
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7405919 |
Electronic circuit having transmission line type noise filter
A power supply circuit produces a supply voltage to be supplied to a microprocessor which is an integrated circuit. A transmission line type noise filter includes a signal input terminal, a signal...
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7405498 |
Multi-level active filter
A multi-phase active filter includes a group of power cells electrically connected in a three-phase configuration, a precharging circuit, and a controller that controls the voltage delivered to the...
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7378754 |
Three-phase harmonic reduction filter for bidirectional power converters
A three-phase filter has first, second, and third power source connectors and first, second, and third load connectors. A separate phase line filter is connected between each pair of power source...
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7368891 |
Charge control method of capacitor in thyristor converter
Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control...
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7362162 |
Line filter
The invention is directed to a network filter that comprises at least one phase input and a protective conductor in which each phase input is connected via a filter inductance to a corresponding...
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7336193 |
Device for monitoring the leakage current of a surge arrester
A device for monitoring a leakage current of a surge arrester has a measuring element for detecting a leakage current in a leakage current circuit. A filter assembly filters the leakage current in...
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7301787 |
Active type harmonic suppression apparatus
An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power...
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7289888 |
Active filter and method for scheduling transistor bridge trigger times for each phase of power grid
A method for scheduling of periodic real time processes in an operating system, comprising the steps of defining a reference point in time for a periodic real time process, and scheduling the...
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7262521 |
Variable AC voltage regulation control method and apparatus
A method and apparatus is disclosed for providing a regulated voltage output from a variable voltage source, alternately using saturation control and cancelling control to regulate output.
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7245045 |
T-filter for reducing disturbances generated on a power grid by an active filter
An active filter ( 4 ) for compensation of variations in an apparatus' ( 3 ) current consumption from a power grid ( 1 ) as a cause of variations in the apparatus electrical load, through active...
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7233081 |
Power-supply device
A power-supply device suppresses high harmonic waves, controls the flow of AC power, and minimizes adverse effects on a load that might otherwise be caused by a large surge of current into the load...
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7200500 |
Determining parameters of an equivalent circuit representing a transmission section of an electrical network
A method for determining an equivalent impedance of a transmission section of an electrical network, includes representing the transmission section as having at least two interfaces with other...
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7193869 |
Noise suppressor
A noise suppressor capable of achieving reduction in size and weight of devices is provided. The noise suppressor is a circuit for suppressing normal mode noise which is transmitted through a first...
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7092229 |
Electrical filter/protector, and methods of constructing and utilizing same
A device for an electrical power system having a nonlinear load. The circuit is connected in series with the nonlinear load and is tuned to the third harmonic of the power source frequency. The...
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7091704 |
Three-phase three-wire active power filter
A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor...
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7078831 |
System for correcting power factor and harmonics present on an electroduct in an active way and with high-dynamics
An electric control system for a pulse width modulated inverter connected in parallel to an electricity distribution network for correcting or minimizing a voltage total harmonic distortion of the...
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7061142 |
Inline power device detection
According to one embodiment of the invention, a method for providing power to a device coupled to a communications switch through a data line is provided. The method includes determining that the...
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7054172 |
Method and structure for active power supply control and stabilization
A method and structure for active power control of a power supply element coupled to an electronic circuit. The structure comprises a control element coupled to the electronic circuit, said control...
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7053505 |
Amplifying circuit, noise reducing apparatus and power converting apparatus
An amplifying circuit, which generates a compensation current based on a detection result of a leakage current flowing between an AC power source for supplying power and a power converting circuit...
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7026728 |
System for supplying electrical power to a load by a transmission path which has been split into two parts
The system is intended to provide an isolated power supply for an electrical load. It contains a generator for producing a supply signal, and a transmission path having two separate branch...
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6985370 |
AC power line filter
A parallel resonant circuit for removing noise and harmonic frequencies from the AC power source is connected directly in parallel to a power source with no intervening electrical components. The...
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6958666 |
Filtering circuit and power supply device equipped with same
The invention provides a filter circuit comprising inductors ( 6, 15 ) and capacitors ( 11 ) interconnected to form filter stages, the capacitors ( 11 ) being distributed over at least two printed...
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6940187 |
Robust controller for controlling a UPS in unbalanced operation
A controller ( 236 ) for an uninterruptible power supply (UPS) compensates for harmonic distortion in the output current ( 224,26,228 ). The controller also provides a control vector ( 230 ) also...
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6909203 |
I/O interface anti-resonance passband shunting technique
A method and apparatus for regulating resonance in a computer system I/O interface is provided. A shunting impedance/resistance is arranged across a power supply of the I/O interface. The shunting...
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6876179 |
Hybrid reactive power compensation device
A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive...
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6862199 |
Adaptive controller for d-statcom in the stationary reference frame to compensate for reactive and harmonic distortion under unbalanced conditions
A controller ( 130 ) for compensating reactive power and selected current load harmonics in an unbalanced multi-phase power distribution system. Control current is injected from a multi-phase...
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6788166 |
Harmonic wave distortion suppressor
A harmonic wave distortion suppressor includes a main body, at least a connecting pin and a coating. The main body is made of a first material and covered with a second material for absorbing an...
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6747373 |
System and method for coordinated control of a switched power capacitor with an integrated resonance protection system
System and methods for coordinating the control system of a switched power capacitor with an integrated resonance protection function. The coordination system coordinates the function of a switched...
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6717789 |
Power supply rejection circuit for capacitively-stored reference voltages
A power supply rejection circuit and method thereof for capacitively-stored reference voltages is disclosed. The power supply rejection circuit generally comprises a comparison circuit for...
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6661680 |
Higher harmonic suppressor element and DC power supply unit using the same
A higher harmonic suppressor element 10 includes a higher harmonic coil 12 for suppressing a higher harmonic and a thermal fuse 14 which is connected in series with the higher harmonic coil ...
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6657322 |
Control system for active power filters
An active filter controller for use with both pure and hybrid shunt filters wherein the controller maintains a minimum DC bus voltage required to generate a compensating current on coupling lines...
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6636405 |
Mitigation of 3rd harmonic currents in electrical power distribution systems
In a multiple phase system for supplying power from an AC source to nonlinear loads, a device for substantially eliminating currents in a neutral wire. The device includes a completely-passive...
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6624997 |
Electrical power conditioner
A transformer based power conditioner to provide high purity electrical power. Capacitor based low impedance filters may be connected in the transformer secondary for noise filtering. Surge...
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6605882 |
Integrated harmonic mitigation device and distribution panel configured as a power center unit for electronic equipment
An integral harmonic mitigation device and distribution panel(s) are configured as a power center unit for non-linear electrical loads. The power center unit performs harmonic mitigation to reduce...
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6577487 |
Reduction of harmonics in AC machines
Connection arrangements are employed for reducing the effect of third-hannonic voltages in case of direct connection of AC machines to a three-phase distribution or transmission network, wherein...
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6559561 |
Method and a device for damping power oscillations in transmission lines
In a method for damping power oscillations in a transmission line, at least one first angular-frequency signal is generated, representing a first angular frequency which is given by a prior...
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6552919 |
Converter utilizing pulse duration modulation and ripple control
A method for use in a power converter which includes: monitoring a magnitude of an input of a power-flow controller; generating a pulse-width modulated signal wherein at least one pulse has width...
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6549434 |
Harmonic mitigating method and apparatus
A harmonic mitigating apparatus connected between a three phase power source and a load provides a multiple-winding reactor for reducing harmonics directed from the load to the source, the...
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6522243 |
Geometric harmonic modulation signaling and detection
A communication system includes a transmitter configured to pulse shape a GHM signal to confine the frequency spectrum of the GHM signal within a predefined frequency range. A receiver is also...
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6486570 |
Waveform correction filters
A waveform correction filter is connected into an alternating current power line to absorb and remove various forms of power pollution, including high-frequency spikes, surges and other forms of...
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