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| Number | Title | Issue Date |
| 7573253 | System for managing electrical consumption A system for managing electrical consumption includes a connecting means for connection to an incoming power supply of a facility, for connection in parallel, including a hot line and a neutral line, and at least one ground. The following components are connected be... | 08/11/2009 |
| 7436164 | Untethered device employing tunable resonant circuit An untethered device is configured to inductively couple to a source device, which generates a varying magnetic field having a fixed frequency. The untethered device includes a tunable resonant circuit having a resonance frequency and configured to generate a supply... | 10/14/2008 |
| 7417875 | Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same A power converter having input and output nodes and a method of operating the same. In one embodiment, the power converter includes a switching circuit including first, second and third active phase legs. Each of the first, second and third active legs includes a fi... | 08/26/2008 |
| 7362596 | Transformer balance circuit A balancing circuit for systems having at least first and second transformers. The transformers' primary sides are connected to one another. The transformers' secondary sides also are connected to one another. The balancing circuit includes a branch connecting one t... | 04/22/2008 |
| 7355871 | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components An energy transfer element having an energy transfer element input winding, an energy transfer element output winding and energy transfer element windings that reduce displacement currents. In one aspect, an energy transfer elements includes an energy transfer eleme... | 04/08/2008 |
| 7340355 | Compensated current differential relaying method and system for protecting transformer Disclosed is a compensated current differential relaying method and system for protecting a transformer more correctly by calculating and estimating an exciting current including a core-loss current and a magnetizing current, and, in particular, to a compensated cur... | 03/04/2008 |
| 7282893 | Method and apparatus for generator control A generator control circuit is provided that includes a first circuit (44) monitoring a generator voltage change rate and producing a first output when the voltage change rate is above a first level, a second circuit (48) monitoring a generator current... | 10/16/2007 |
| 7276999 | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components An energy transfer element having windings. In one aspect, the energy transfer element includes a first winding wound around a core, the first winding has a first end and a second end. A second winding is wound around the core. The second winding has a first end and... | 10/02/2007 |
| 7242157 | Switched-voltage control of the magnetization of current transforms and other magnetic bodies The magnetic flux of a magnetic body is controlled with voltage pulses from an active voltage source. The voltage pulses are applied to a winding circuit which is magnetically coupled to the magnetic body. An electronic switch means is used to generate the voltage p... | 07/10/2007 |
| 7180282 | Apparatus for metering at least one type of electrical power over a predetermined range of service voltages Methods and apparatus for supplying power for use in metering electrical energy over a wide range of voltages with a single meter are disclosed. The wide ranging meter includes a processing unit for processing divided input voltage and a current component in order t... | 02/20/2007 |
| 7174261 | Power line sensors and systems incorporating same An apparatus for sensing the current in a power line of a power system and systems incorporating the apparatus are disclosed. The apparatus may comprise an enclosure providing a window operable to permit the passage of the power line therethrough. The apparatus may ... | 02/06/2007 |
| 7145321 | Current sensor with magnetic toroid A current sensor for sensing current in a primary source, including a primary conductor forming at least one winding on a first portion of a toroid formed from a magnetic material. A secondary source of electrical current from a signal forms a plurality of winding o... | 12/05/2006 |
| 7122999 | Circuit for compensating rise times and ringing in high impedance loads Circuits for shortening a rise time of a load include a main pulse transformer coupled to a load, an auxiliary pulse transformer coupled to the load, and a diode connected between the auxiliary pulse transformer and the main pulse transformer. The main pulse transfo... | 10/17/2006 |
| 7119647 | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components without requiring additional windings An energy transfer element having an energy transfer element input winding and an energy transfer element output winding. In one aspect, the energy transfer element input winding is capacitively coupled to the energy transfer element output winding. The energy trans... | 10/10/2006 |
| 7084728 | Electrically decoupled integrated transformer having at least one grounded electric shield An integrated circuit, such as a radio frequency integrated circuit (RFIC), has a first layer bearing first metallization patterned for defining a first inductive coil, a second layer bearing second metallization patterned for defining a second inductive coil that o... | 08/01/2006 |
| 7075288 | System and method for acquiring voltages and measuring voltage into and electrical service using a non-active current transformer A voltage acquisition circuit for sensing input voltage signals in each phase of an electrical service includes a non-active current transformer configuration that is operable over a wide input voltage range. The current transformer configuration includes primary an... | 07/11/2006 |
| 7002333 | Process and device for compensating the low frequency magnetic field in an inductive signal coupling unit Process and device for compensating the low frequency magnetic field in an inductive signal coupling unit. According to the invention the coupling unit comprises a ferromagnetic core (30) which encloses a conductor through which a low frequency current (1 | 02/21/2006 |
| 6958594 | Switched noise filter circuit for a DC-DC converter A switched noise filter circuit for DC-DC converters which use the instantaneous output voltage to establish the converter's duty ratio. The converter cycles the switching element on and off for time intervals Ton and Toff, respectively. A swit... | 10/25/2005 |
| 6713999 | Current sensor working in accordance with the compensation principle A current sensor (1) is provided with low-pass filters (17 and 18) for stabilizing the pulse-duration modulated compensation signal. The current sensor is also provided with an additional RC element (40). Furthermore, a limiting means con... | 03/30/2004 |
| 6661072 | Piezoelectric ceramic transistor A piezoelectric ceramic transistor is formed from a single-layered or multi-stacked layers piezoelectric ceramic voltage transformer and a capacitor, the capacitor being series connected to an input terminal of the piezoelectric ceramic voltage transforme... | 12/09/2003 |
| 6577111 | Controlling magnetizing current in a transformer by comparing the difference between first and second positive peak values of the magnetizing current with a threshold Differential measurement of a transformer magnetizing current and a delta-modulation technique is used to provide compensation for dc saturation of the transformer core, with faster response times, low losses, and with immunity to dc drift in the measurin... | 06/10/2003 |
| 6545453 | Systems and methods for providing voltage regulation externally to a power transformer Voltage regulation of power transformers by the use of a separate, removable, detachably coupled device external to the main transformer that can be attached to a main transformer unit when voltage regulation is desired. The device is connected to the thr... | 04/08/2003 |
| 6469486 | Flux equalized transformer circuit A transformer group in which a multitude of transformers are used to supply energy to a single load. The transformers are connected in series; in order to assist in providing a "flux equalizing" affect, the invention includes a flux equalizer circuit. The... | 10/22/2002 |
| 6384588 | Method and apparatus for asymmetrically inducing voltages in transformer secondary windings while avoiding saturation of the transformer core A method for magnetically inducing voltages in the secondary windings of a transformer without saturating its core. The method includes (a) applying to a first primary driven winding a first set of voltages, thereby generating (i) a first current in the f... | 05/07/2002 |
| 6326772 | Power supply apparatus with energy return for reuse A power supply apparatus 200 comprises an energy supplying circuit 210 for supplying energy at a predetermined timing, and an energy preserving circuit 220 for receiving the energy supplied from the energy supplying circuit 210 and preserving the energy. ... | 12/04/2001 |
| 6252386 | Non-contact power supply system and apparatus and carrying equipment using the system In a non-contact power supply apparatus which interlinks a magnetic flux generated by an AC current flowing through a primary circuit with a secondary circuit so that an induced power is generated in the secondary circuit, and supplies a constant voltage ... | 06/26/2001 |
| 6201382 | Low noise and energy loss power supply apparatus and voltage converter A power supply apparatus 200 comprises an energy supplying circuit 210 for supplying energy at a predetermined timing, and an energy preserving circuit 220 for receiving the energy supplied from the energy supplying circuit 210 and preserving the energy. ... | 03/13/2001 |
| 6181124 | Eddy current reducing system Eddy currents are produced by a changing magnetic field acting upon free electric charges in the ferromagnetic core. When the free electric charges are removed from the core eddy currents will be reduced. When an excess of free electric charges are added ... | 01/30/2001 |
| 6087822 | Power transformer with internal differential mode distortion cancellation A power transformer with internal differential mode distortion cancellation, comprising a primary coil for connection to a power source providing a fundamental frequency power signal, a secondary coil for connection to an electrical load, a magnetic core ... | 07/11/2000 |
| 6087818 | Recreational vehicle voltage booster A voltage booster device for increasing the voltage level of power received by a recreational vehicle (RV) from a separate 120-volt power source includes an electrical box, a power cord and female outlet on the box, and an encapsulated transformer within ... | 07/11/2000 |
| 6020732 | Flux cancelling transformer line circuit A flux cancelling transformer line circuit includes an AC current source that blocks AC current and passes DC current. The current source is connected between the primary and secondary windings of a transformer. Direct current flowing through the primary ... | 02/01/2000 |
| 6021054 | Smoothing circuit for switching power supply for reduction of noise In a smoothing circuit for a switching power supply having a reactor and a capacitor, the circuit includes a resistor connected in series to the capacitor, a MOSFET connected parallel to the resistor, and a control circuit for turning the MOSFET on only w... | 02/01/2000 |
| 5936856 | Method and apparatus for active common-mode voltage compensation in induction motor systems A method and apparatus for compensating for common mode voltages in the output of PWM inverters in induction motor systems is disclosed. In one embodiment, a common mode sensing circuit is coupled to the output of a three-phase inverter to detect common m... | 08/10/1999 |
| 5905372 | Apparatus and method for delivering power to a contactless portable data device A terminal device powers a portable data device by transmitting in two modes of operation. In a first mode of operation, the terminal transmits to the portable data device a power signal at a first level and a data signal using a first modulation format a... | 05/18/1999 |
| 5905367 | Power inverter apparatus using a transformer with its primary winding connected the source end and a secondary winding connected to the load end of an AC power line to insert series compensation Series voltage compensation is provided in an ac power line by connecting the inverter unit of a dynamic voltage restorer (DVR) in series with the primary winding of a load transformer, which may already be present, thereby eliminating the need for inject... | 05/18/1999 |
| 5747980 | Differential transformer correction by compensation A differential transformer includes a magnetic core within which difference signal detection inaccuracies resulting from non-homogeneity within the core are corrected by compensation. A phase wire extends proximate the magnetic core for transporting a fir... | 05/05/1998 |
| 5663636 | Method for reducing waveform distortion in an electrical utility system and circuit for an electrical utility system The invention relates to an interference suppression method and circuit for an electrical system, said electrical system comprising a main transformer (2) with a star point (12), phase leg conductors (L1, L2, L3) connected to the transformer (2), a neutra... | 09/02/1997 |
| 5654630 | Contactless sensor driven by single power supply A sensor contactlessly driven by a single power supply is disclosed. A current flows in a resistor RL through the secondary winding of a coil in the direction corresponding to the direction of magnetic fluxes generated in the coil in accordance... | 08/05/1997 |
| 5652507 | Apparatus and method for measuring an AC current which saturates the core of a current transformer The dynamic range of a current transformer (CT) is increased without reducing the scaling of measurements at the low end of the dynamic range by designing the core of the CT to saturate only after about 90 electrical degrees of the maximum current to be m... | 07/29/1997 |
| 5495241 | Method for reducing power loss in devices for contactless data and energy transfer, and apparatus for performing the method In a method and apparatus for reducing power loss in devices for contactless data and energy transfer, a function unit is provided in a movable part which ascertains the value of the current loss of a voltage regulator. This value is then either stored in... | 02/27/1996 |
