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| Number | Title | Issue Date |
| 8143747 | Flux control system for active voltage conditioning A flux control system for a three-phase active voltage conditioner that utilizes an injection transformer to apply calculated compensation voltage to a mains supply. The flux control system is configured to modify the compensation voltage to be applied to at least o... | 03/27/2012 |
| 8138633 | 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 cerami... | 03/20/2012 |
| 8106540 | 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... | 01/31/2012 |
| 8093758 | Method and apparatus for control of inductively coupled power transfer systems A power pick-up for an Inductively Coupled Power Transfer (ICPT) system is provided having a resonant pick up circuit. The natural frequency of the pick-up circuit may be varied by controlling the conductance or capacitance of a variable reactive in the resonant cir... | 01/10/2012 |
| 8093759 | Regulated energy supply for a rapidly cycling integrated circuit with reduced electromagnetic radiation A device (12) supplies energy to a rapid cycling and/or rapidly cycled integrated circuit (13, 52) which includes a circuit load (17) and an internal capacity (15) connected parallel to the circuit load (17). The integrated circuit... | 01/10/2012 |
| 8063515 | 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 ... | 11/22/2011 |
| 8004119 | 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 ... | 08/23/2011 |
| 7952235 | 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 cerami... | 05/31/2011 |
| 7923867 | 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 differen... | 04/12/2011 |
| 7906872 | Dynamic harmonic filter for an AC power system A dynamic harmonic filter for an AC power system comprising at least one voltage source and at least one load is provided. The harmonic filter comprises a current sensing or voltage injection transformer connected in series with the voltage source and the load. One ... | 03/15/2011 |
| 7884503 | 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 suppr... | 02/08/2011 |
| 7804198 | 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-... | 09/28/2010 |
| 7701090 | Active filter An active filter that can remove harmonic noises other than the fundamental wave in a system having many unspecified harmonics and can contribute to the stable operation of the system, and improvement in the quality of power is provided. Using the following power eq... | 04/20/2010 |
| 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 load connector. The filter has a magnetically permeable core with three ... | 05/19/2009 |
| 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 device while providing all windings on a single core. This allows for the ... | 11/11/2008 |
| 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 to the generator and configured to generate an output power and provi... | 11/04/2008 |
| 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 frequencies and voltage levels by sensing and separating them from the d... | 11/04/2008 |
| 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 output terminal and two ground terminals corresponding respectively t... | 07/29/2008 |
| 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 plurality of power cells. Each power cell includes an inverter havin... | 07/29/2008 |
| 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 and load connectors. Each phase line filter includes a line winding co... | 05/27/2008 |
| 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 method of a capacitor in a thyristor converter comprising a thyristor fo... | 05/06/2008 |
| 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 phase output, in which the input side of each filter inductance is conn... | 04/22/2008 |
| 7352597 | Comprehensive power quality controller for substation in power system This invention disclosed is a comprehensive power quality controller for substation in the electric power system and includes a Thyristor Controlled Reactor (TCR), pure tuned passive filter Zf, additional inductor L active power filter (APF), and a coupli... | 04/01/2008 |
| 7340158 | Method and circuit configuration for controlling a polyphase brushless electric motor A method is specified for controlling a polyphase brushless electric motor, wherein the motor phase currents which are associated with the phases are produced by clocked variation of the respectively applied electrical potential. In this case, the motor phase curren... | 03/04/2008 |
| 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 order to extract a third harmonic oscillation which is evaluated by a... | 02/26/2008 |
| 7317301 | Auxiliary power supply An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power source to the load circuit. The power source includes a high frequency v... | 01/08/2008 |
| 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 source is approached to a sinusoidal wave. The control circuit retrieve... | 11/27/2007 |
| 7301440 | Power line communication system and method The present invention provides a device for providing communications through power lines comprised of multiple conductors by transmitting the data signals through a plurality of the conductors. One embodiment of the present invention may be comprised of a transmit c... | 11/27/2007 |
| 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 periodic real time process from the reference point in time. Preferably a ... | 10/30/2007 |
| 7279850 | Decoupling circuits Power taken inductively from the alternating current in a track is received by a resonant circuit which is output controlled by a switching circuit asynchronous with the frequency of the power supply. The switch on and off time is controlled to regulate the output p... | 10/09/2007 |
| 7277779 | Real-time emergency control in power systems The present invention is concerned with a method for real-time emergency control of power transmission networks, based on a modification of the model predictive control (MPC) approach. Following the detection of a contingency at time tc only one nominal t... | 10/02/2007 |
| 7272026 | Power converter for a hybrid power filter A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of ... | 09/18/2007 |
| 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. ... | 08/28/2007 |
| 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 frequency filtering and dynamic compensation of reactive... | 07/17/2007 |
| 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 during the startup or stopping of the power-supply device. The power... | 06/19/2007 |
| 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 steady state error and is separated from the pulse width modulated co... | 05/01/2007 |
| 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 sections of the network. For each interface, a voltage phasor and a curre... | 04/03/2007 |
| 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 current-carrying wire and a second current-carrying wire, and causes... | 03/20/2007 |
| 7183751 | Reactive power compensator device A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current injection. The reactive power compensator device provides with compensation r... | 02/27/2007 |
| 7176656 | Tool with battery pack A handheld tool has an attached position in which the tool is removably attached to a battery pack. The battery pack has an auxiliary battery and output terminals for outputting electricity from the auxiliary battery. The tool includes a load and a primary battery. ... | 02/13/2007 |
