| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 307105000 | WITH HARMONIC FILTER OR NEUTRALIZER | 33 |
| 20080211315 | Electrical harmonic suppression system and enclosure for the same - In an electrical distribution system for supplying power from an AC source to an adjustable-speed drive connected in a single-phase manner, a device for substantially eliminating harmonic currents in the supply lines of said system. The device includes a completely-passive parallel resonant circuit having three passive electrical branches connected in parallel and also having an almost infinite impendence at a third harmonic frequency of a fundamental frequency of said AC source to prevent the formation of only said third harmonic frequency so that there is no third harmonic current to remove or dissipate as heat. The three passive electrical branches comprise a first branch consisting of a capacitor, a second branch consisting of a reactor, and a third branch consisting of a resistor. The parallel resonant circuit is electrically connected to at least one supply line. | 09-04-2008 |
| 20080309168 | Method and Arrangement for Harmonic-Wave Suppression for AC Voltage-Operated PTC Heaters - The invention relates to a method and to an arrangement for harmonic-wave suppression in AC voltage-operated PTC heaters, especially in frequency-stable and frequency-variable alternating-voltage networks in aerospace applications. The problem of harmonic-wave suppression for AC voltage-operated PTC heaters, in which the harmonic waves are suppressed by superimposing a correction current, which permits a simple and economical generation of the harmonic-wave suppression signal, is solved according to the invention by generating a correction current in a correction current circuit arranged parallel to the PTC heater using an ohmic resistor ( | 12-18-2008 |
| 20090021083 | POWER GRID FILTER CHOKE - The object of the invention is to implement a circuit arrangement, which in rated operation without resonance generates as little power loss as possible, but on suitable excitation effects a disproportionate asymmetrical damping, so that resonances and overvoltages associated with them are avoided. The object is attained by using a damping member 5a, b, c, which effects the damping in proportion to a primary circuit parameter. The advantage is the adaptive performance of a power grid filter equipped with the choke of the invention. | 01-22-2009 |
| 20090121553 | Electronic power-saving device - A single-phase electronic power-saving device includes at least one power-saving unit. The power-saving unit includes two ceramic piece capacitors, a safe capacitor, an inductor, a SCR, a first resistor, a second resistor, a live wire and a zero line; the two ceramic piece capacitors connected in series as a whole is connected in parallel with the safe capacitor to two terminals of which are connected the anode and the cathode of SCR, respectively; the anode of SCR is also connected to one terminal of the inductor, the branch composed of the first and the second resistors connected in series is connected in parallel so that one terminal of which is connected to one terminal of the inductor and the other is connected to the cathode of SCR; the gate of SCR is connected between the first and the second resistors. | 05-14-2009 |
| 20090134714 | COMPENSATION OF HARMONICS OF ELECTRICAL NETWORK - A system and a method for compensating harmonic components or a reactive power of an electrical network. The system comprises a measurement unit ( | 05-28-2009 |
| 20090212640 | Device for Connection to an Impedance Having a Mainly Inductive Character - A device for connection to an impedance having a mainly inductive character. The device comprises a reactive element. Furthermore, the device is provided with inputs for inputting output signals of electric inverters for parallel supply and at least one output for connection to a supply terminal for a phase of the impedance, such that the device is composed to substantially filter out a high-frequency differential component of at least two output signals during use. | 08-27-2009 |
| 20090212641 | METHOD FOR OPERATING A CONVERTER CIRCUIT, AND APPARATUS FOR CARRYING OUT THE METHOD - A method for operating a converter circuit is disclosed. Such a converter circuit has a converter unit with a multiplicity of actuatable power semiconductor switches and is connected to a three-phase electrical AC mains system and in which the actuatable power semiconductor switches are actuated by means of an actuation signal (S | 08-27-2009 |
| 20090243398 | Systems and Methods for Reducing Distortion in a Power Source Using an Active Harmonics Filter - Systems and methods for reducing harmonic distortion in a power system resulting from non-linear loading on the power system. The power at an interface with a power source is measured, and then distortion in the waveforms of the supplied power is identified. Cancellation signals which cancel all or part of the distortion are then generated and injected at the interface. In one embodiment, the power is sampled to determine the waveform, and then a Fast Fourier Transform is performed on the waveform to convert it to the frequency domain. Harmonics of the fundamental frequency can then be identified, and conjugates of the harmonics generated. An inverse Fast Fourier Transform is performed on the conjugates to generate a signal which is amplified to produce the cancellation signal. | 10-01-2009 |
| 20090302689 | HARMONIC ABSORBER - This is a harmonic absorber ( | 12-10-2009 |
| 20090309425 | ELECTROMAGNETIC NOISE SUPPRESSION SYSTEM FOR WYE POWER DISTRIBUTION - Three single-phase transformers having primary sides connected in a delta connection and the secondary sides connected in a series-delta connection. Each power line is connected through a fused disconnect to two primary terminals, each primary terminal on a different transformer. A second terminal on the secondary side of the first phase transformer is connected to a first terminal on the secondary side of the third transformer through a non-inductive grid resistor. The second terminal on the secondary side of the third transformer is connected to the first terminal on the secondary side of a second transformer. The second terminal on the secondary side of the second transformer is connected to the first terminal on the secondary side of the first transformer. In this fashion, the secondary sides of each of the single-phase transformers are connected in series through a non-inductive grid resistor. | 12-17-2009 |
| 20100001588 | Multi-function three-phase active power filter - A new multi-function shunt active filter has been successfully implemented. The proposed decoupler and cascade controller provide a simple solution to power factor correction, reduction of harmonics loads and load balancing. The mathematical burden of resolving the load current to fundamental and harmonics is not required. The decoupler and controller can easily be implemented using low-cost analogue devices. | 01-07-2010 |
| 20100052432 | Method and Arrangement for Harmonic Wave Suppression in AC Voltage-Operated PTC Air Heaters - The invention is directed to a method and an arrangement for harmonic wave suppression in AC voltage-operated PTC heaters in which a harmonic component which is generated in the current of the PTC heater and which contains predominantly the third harmonic of the heating current is compensated by the superposition of correction signals. It is the object of the invention to find a novel possibility for a simple and robust suppression of harmonic waves in AC voltage-operated PTC heaters in which the permissible limiting values for harmonic distortion are not exceeded as a result of changes in heating output. This object is met according to the invention in that a voltage modulation is generated in a voltage modulator ( | 03-04-2010 |
| 20100090537 | COMPENSATION SYSTEM FOR POWER TRANSMISSION - A system is provided for compensating a power transmission line having one or more non-conventional power generating sources connected to the power transmission line. At least one series compensation circuit is connected to a portion the power transmission line, and at least one damping circuit is connected in parallel with the series compensation circuit. The damping circuit reduces subsynchronous series resonance caused by the series compensation circuit on the power transmission line, and the series compensation circuit compensates the power transmission line. | 04-15-2010 |
| 20100090538 | COMPENSATION SYSTEM FOR POWER TRANSMISSION - A system for compensating a power transmission grid is provided. The system includes one or more non-conventional power generating sources that are connected to the power transmission grid. At least one series compensation circuit is connected to at least a portion of the power transmission grid, to compensate the power transmission grid. At least one damping circuit is connected to at least a portion of the power transmission grid, and it mitigates subsynchronous series resonance caused by the series compensation circuit on the power transmission grid. | 04-15-2010 |
| 20100123356 | RESONANCE MITIGATION SYSTEM AND METHOD - A system for reducing resonance from harmonic distortion in a high voltage power system is presented. The system includes a voltage damper coupled to the high voltage power system between a cable sheath and an earth connection. The voltage damper is configured to clamp voltage peaks. The system also includes a frequency shifter coupled across the voltage damper and configured to displace a resonance frequency of the high voltage power system. | 05-20-2010 |
| 20100156194 | DEVICE FOR FILTERING HARMONICS - A power device is provided for filtering or dampening harmonics and optimizing the power factor in power distributions systems. A device for a 3-phase power system comprises series inductors able to communicate between an AC power source and a non-linear load. Connected in parallel to the series inductors, at the junction with the non-linear load, are shunt inductors used to trap harmonic currents. Power factor correction capacitors are connected to the ends of the shunt inductors. The series inductor and shunt inductor are used to form a coaxial reactor assembly, which further comprises a reactor core. The coaxial reactor assembly is formed by winding a first inductor around the core and then winding a separate second inductor around the perimeter of the first inductor. In another embodiment, the device includes a third inductor to achieve better dampening and power factor performance. | 06-24-2010 |
| 20100187914 | METHODS AND APPARATUS FOR POWER FACTOR CORRECTION AND REDUCTION OF DISTORTION IN AND NOISE IN A POWER SUPPLY DELIVERY NETWORK - Methods and apparatus for power factor correction include selectively coupling bit reactive loads with a load having dynamic reactive properties to dynamically correct a power factor. Methods and apparatus for reducing distortion in a power delivery system include a means for determining distortion in a power line, forming a corrective signal according to the distortion and selectively sinking and sourcing current to the power line according to the corrective signal. | 07-29-2010 |
| 20100264749 | DIFFERENTIAL ELEMENT WITH HARMONIC BLOCKING AND HARMONIC RESTRAINT OPERATING IN PARALLEL - An intelligent electronic device (IED) provides harmonic blocking and harmonic restraint differential protection operating in parallel. The IED includes a harmonically-blocked differential element supervised by one or more even harmonics of a raw operating current (a current comprising the fundamental operating current and the harmonics thereof). The IED also includes a parallel, harmonically-restrained differential element, which is restrained by harmonics of the raw operating current. Tripping signals output by the parallel harmonically-blocked differential element and the harmonically-restrained differential element may be selectively combined into a single tripping signal output. An additional harmonic blocking element may supervise both differential elements and/or the combined tripping signal. The additional harmonic blocking element may provide odd-harmonic blocking, such as harmonic blocking based on a fifth harmonic of the raw operating current. | 10-21-2010 |
| 20100264750 | HARMONIC FILTER WITH INTEGRATED POWER FACTOR CORRECTION - A distributed electrical power generating and utilizing system includes an induction generator driven by a prime mover requiring reactive power to operate for providing electrical power on a bus. The bus has a gross load and is also connectable to a utility power grid by a switch. The gross load includes at least a non-linear electrical load component, typically including a variable speed device and associated diode rectifier front end. The bus includes a harmonic filter having a power factor-correcting capacitor integrated therewith for collectively compensating harmonic distortion caused by the non-linear load component and for correcting power factor to compensate for reactive power required by at least the inductive generator. | 10-21-2010 |
| 20110057517 | Hybrid Conditioner for a Power System - A hybrid conditioner for filtering harmonics in a power system that includes a non-linear load. The hybrid conditioner includes an active filter structured and controlled to filter one or more high-order harmonic currents of the fundamental frequency, and a passive filter structured to filter one or more low-order harmonic currents of the fundamental frequency. The active filter and the passive filter are electrically connected in parallel with one another. The hybrid conditioner may also be for providing reactive power compensation for the power system, wherein the active filter is further controlled to provide a compensatory reactive power for compensating for the reactive power that is consumed by the load. The hybrid conditioner may also provide oscillation dampening for the power system, wherein the active filter is further controlled to damp oscillating currents that exist between the passive filter and the AC source. | 03-10-2011 |
| 20110234015 | COOLING SYSTEM AND SEVER USING SAME - A cooling system is used in a server. The server includes an uninterruptible power supply. The cooling system includes a protecting unit, a transformer unit and a alternating current powered fan. The protecting unit is electrically connected to the uninterruptible power supply for suppressing harmful factors in the power provided by the uninterruptible power supply. The transformer unit is electrically connected to the protecting unit for transforming the power outputted from the protecting unit. The alternating current powered fan is connected to the transformer unit for getting power from the transformer unit. | 09-29-2011 |
| 20120038221 | ELECTRONIC CORRECTION UNIT - The present invention relates to a device for power factor correction and electrical wide band filtering in electrical systems for reducing considerably voltages of frequencies higher than 110 Hz on power systems rated for 10 Hz to 60 Hz and to improve power factor by injecting reactive power into the system. The device of the present invention provides a combination of inductors and capacitors which effectively corrects the power factor and filters out voltages of high frequencies. | 02-16-2012 |
| 20120217821 | SYSTEM AND METHOD FOR PERFORMING HARMONIC FREQUENCY FILTRATION AND ANALYSIS - A system for filtering harmonic frequency distortion in AC power distribution system is disclosed. The system comprises a filter configured to filter harmonic frequency from the AC power, an input sensor configured to acquire harmonic frequency level of the input AC power before filtration, an output sensor configured to acquire harmonic frequency level of the output AC power after filtration, and an interfacing module connected to the input and output sensor for acquiring signals of the harmonic frequency level of the input and output AC power measured by the input and output sensors, respectively. The interfacing module is further configured to process the acquired signals into computer readable data. The computer readable data can be accessed through remote server via IP-based communication network. A method for filtering harmonic frequency distortion of AC power and measuring power quality of the AC power is also disclosed. | 08-30-2012 |
| 20130033119 | METHODS AND SYSTEMS FOR REDUCING LEAKAGE CURRENT - A filter circuit configured for coupling a power supply and a motor controller is described. The filter circuit includes at least one filter capacitor positioned between the power supply and the motor controller. The filter circuit also includes at least one switching device coupled to the power supply and configured to selectively couple the power supply to the motor controller and/or the at least one filter capacitor to a ground conductor. | 02-07-2013 |
| 20130038139 | COMBINED ACTIVE AND PASSIVE HARMONIC MITIGATION DEVICES AND APPLICATIONS THEREOF - In one embodiment, the instant invention can provide a harmonic mitigating device that can include at least the following components: an active filter; a passive filter; c) at least one control switch, where the at least one control switch operationally controls whether the at least one active filter or the at least one passive filter can be utilized by the harmonic mitigation device to mitigate at least one harmonic current flow, and where the at least one control switch operationally switches the harmonic mitigation device from utilizing the at least one active filter to utilizing the at least one passive filter when a current load exceeds a predetermined percent of a full current load. | 02-14-2013 |
| 20130113300 | COMBINED BALUN TRANSFORMER AND HARMONIC FILTER - In one embodiment, a balanced to unbalanced transformer utilizes a crossover configuration such that some portion of the secondary coil (inductor) is shared between two resonators (capacitors). Adding a first capacitor in parallel with a portion of the secondary inductor creates a first harmonic trap (filter), and also efficiently uses the secondary coil (inductor) as a resonating element. | 05-09-2013 |
| 20130169063 | USB Connector, PCB Connected Thereto, and USB Device - A USB connector, a PCB connected to the USB connector, and a USB device are provided. The USB connector includes a metal surface, and on the metal surface, a solid metal part is set at a location corresponding to a spring of a socket, so that the spring contacts the solid metal part after the USB connector is inserted into the socket to reduce electromagnetic interference. The USB connector may include an in-line weld leg; a metal enclosure located at the same side as the in-line weld leg fully contacts a PCB when the USB connector is connected to the PCB; and contact surfaces on the USB connector that contact the PCB are metal surfaces. The PCB includes a suppression circuit configured to suppress harmonic waves in USB data transmission. | 07-04-2013 |
| 20130175878 | SYSTEM AND METHOD FOR REDUCING HARMONIC DISTORTION - A method is disclosed including but not limited to supplying a voltage waveform from a higher power electrical bus to a lower power electrical bus; sensing on the lower power electrical bus, a deviation from a sinusoidal voltage waveform in the voltage waveform supplied from the higher power electrical bus; generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform; and filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus. A system is disclosed for performing the method. | 07-11-2013 |
| 20130278077 | ISOLATED MEASUREMENT SYSTEM WITH COOPERATIVELY-TIMED ISOLATED POWER GENERATION - A power delivery system is disclosed for an isolated measurement system in which a power transmitter and power receiver are provided at powered and unpowered sides of an isolation barrier, respectively. The power transmitter and power receiver may be coupled by an isolator. The power transmitter may deliver power to the power receiver to power components on the unpowered side of the isolation barrier. The system may include a controller provided in the powered side to generate a clock signal defining timing of a predetermined operation of the measurement system and to generate a disabling signal to the power transmitter controller synchronously with the timing of the predetermined operation. | 10-24-2013 |
| 20140327324 | METHOD AND APPARATUS FOR REMOVAL OF HARMONIC NOISE - An apparatus for removing harmonic noise from a power transmission line transmitting electricity at a primary frequency includes a filter and a controller coupled to the sensor and to an actuator-generator. The filter separates electricity at a harmonic of a primary frequency from the electrical signal transmitted by the power transmission line. The controller is configured to modulate consumption of electricity from the power transmission line. The consumption is controlled by electrical actuation of the actuator-generator, such that the electrical actuation of the actuator-generator causes consumption of electricity from the power transmission line at a harmonic of the primary frequency. The actuator-generator is coupled to an elastically deformable component, such that electrical actuation of the actuator-generator generates tension in the elastically deformable component. | 11-06-2014 |
| 20150102689 | ACTIVE FILTER FOR RESONANCE REDUCTION - A control unit for an active filter for reducing resonance in an electric system is provided. The electric system comprises a power source distributing an alternating current to an AC conductor connected to a power consuming unit for distributing the AC to the power consuming unit. The active filter comprises a DC power source and a DC conductor connecting the DC power source to the AC conductor. The control unit comprises: a voltage measurement unit adapter to create a voltage signal on the basis of a measured voltage; a computing unit adapted to compute, using a biquadratic filter, a first compensating current on the basis of the voltage signal for reducing resonance in the electric system; and a switching system placed between the DC power source and the DC conductor for creating the calculated first compensating current. | 04-16-2015 |
| 20150333516 | PARALLELING OF ACTIVE FILTERS WITH INDEPENDENT CONTROLS - A parallel filter arrangement with at least two filters supplying current in line side sensing configuration and a number of sensors for measuring current. The sensors are used to determine the amount of current being supplied by the filters and the amount of current being supplied by a source. The filters adjust their supplied current in order to reduce or eliminate the amount of reactive or harmonic current being supplied by a source. | 11-19-2015 |
| 20160126735 | METHOD AND APPARATUS FOR REMOVAL OF HARMONIC NOISE - An apparatus for removing harmonic noise from a power transmission line transmitting electricity at a primary frequency includes a filter and a controller coupled to the sensor and to an actuator-generator. The filter separates electricity at a harmonic of a primary frequency from the electrical signal transmitted by the power transmission line. The controller is configured to modulate consumption of electricity from the power transmission line. The consumption is controlled by electrical actuation of the actuator-generator, such that the electrical actuation of the actuator-generator causes consumption of electricity from the power transmission line at a harmonic of the primary frequency. The actuator-generator is coupled to an elastically deformable component, such that electrical actuation of the actuator-generator generates tension in the elastically deformable component. | 05-05-2016 |
