Class 323/358 - Current transformer

Subclass of Class 323 - Electricity: power supply or regulation systems
Definition: Subject matter wherein the transformer is an instrument
No. of patents: 40
Last issue date: 07/18/2006

Number	Title	Issue Date
7078996	Inductive coupler for power line communications There is provided an inductive coupler for coupling a signal to a conductor. The inductive coupler includes (a) a magnetic core having an aperture through which the conductor is routed, (b) a winding wound around a portion of the magnetic core, where the signal is c...	07/18/2006
6956748	Switching power supply apparatus A switching power supply apparatus which has an input power source; a transformer having a primary winding, a secondary winding, an input winding and a magnetic flux canceling winding being connected to the secondary winding in series; a main switch for switching an...	10/18/2005
6940266	Enhanced cost effective method for high current measurements An electrical connection between a power source and a threaded aperture in a power device is made by means of a terminal lug and a bolt. In order to measure the current, a second electrical path is made in parallel with the bolted connection, and current in the seco...	09/06/2005
6323635	MER2: magnetic error reduction doubled A Swain type direct current clamp-on sensor called MER2 is disclosed with improved magnetic error reduction from undesired magnetic fields generated by noise sources for accurate measurement of low currents. The sensor is comprised of a split core with no...	11/27/2001
6198268	Dual-rated current transformer circuit having at least two input circuits A dual-rated current transformer circuit has a first circuit which delivers a first current and a second circuit which delivers a second current. A current transformer is coupled to both the first and second circuits, wherein the transformer generates a c...	03/06/2001
6028422	Current transformer A current transformer for mains alternating current with dc components is formed of at least one transformer core with a primary winding and at least one secondary winding, of load resistor is connected in parallel to the secondary winding and terminates ...	02/22/2000
5650715	Method and apparatus for sensing current in power supplies A circuit for detecting peak current pulses on a secondary transformer of a power supply and converting these peak current pulses into a direct current (DC) voltages, which can be used for various purposes such as current limiting or current sharing. A pe...	07/22/1997
5610508	Circuitry to maintain proper current transformer operation A circuit to maintain proper current transformer operation in a resonant transition converter circuit or any circuit having a wide range of reverse current present in a current transformer primary at the beginning of a power pulse. The circuit includes an...	03/11/1997
5504419	Rod-core current transformer In the case of the current transformer according to the invention, the components used are arranged in a novel manner. The primary winding (7) is arranged around the secondary winding (8), with an extended core (9), at a distance which is provided for the...	04/02/1996
5410243	Three-phase collected type optical current transformer A three-phase collected type optical current transformer having a common hermetically sealed container miniaturized in its radial direction. The common hermetically sealed container incorporating central conductors and optical current transformers corresp...	04/25/1995
5287479	Flyback transformer In a flyback transformer having a focus pack, in order to facilitate the manufacture and assembly of the focus pack, the focus pack mounted on the flyback transformer is constituted by an outer case portion and an inner case portion, and the outer and inn...	02/15/1994
5282120	Converter for providing boost voltage for a flash discharge lamp serving as a photographic light The present invention has an object to develop a converter allowing dielectric strength of a booster transformer to be reduced by half for miniaturization and security thereof. To achieve this object, the booster transformer is provided with first and sec...	01/25/1994
5220495	Arrangement and method for accurately sensing voltage of a high-impedance source and supplying power to a variable burden An arrangement is provided for accurately sensing the source voltage of a high-impedance source while supplying a variable burden. A current-sensing element is connected in series with a load circuit across a high-impedance source. The load circuit includ...	06/15/1993
5202621	Current transformer arrangement for three-wire three-phase systems to detect the actual current value for controlled DC loads powered via power converters In a current transformer arrangement for three-wire three-phase systems, use is made of a single busing transformer (4) arranged on the three-phase side. Two of the total of three phase conductors are pushed through the bushing transformer, specifically e...	04/13/1993
5157477	Matched impedance vertical conductors in multilevel dielectric laminated wiring Electrical impedance matching for through plane connections or vias in a multiplane laminated wiring structure is provided by arranging the vias in patterns conforming to a standard characteristic impedance configuration. The pattern may be a five wire co...	10/20/1992
5120983	Device for starting automatically an auxiliary unit when switching on a main unit In connection with an automatic starting feature for an auxiliary unit, preferably a vacuum cleaner, which is switched on simultaneously when a main unit, for example an electric hand tool, a machine tool, or the like, is started it is proposed to trigger...	06/09/1992
5093770	Electrical energy storage system A circuit arrangement for providing a store of energy for actuating an electrically operable device, incorporating a reservoir capacitor, comprising a transformer having low resistance windings, the primary winding of which is connectable to an alternatin...	03/03/1992
5051687	Transimpedance circuit A transimpedance circuit for generating an output voltage replica of an alternating current input has its accuracy improved by the use of a current comparator, the ratio windings of the comparator respectively carrying a current proportional to the input ...	09/24/1991
4904925	Apparatus for recovering an alternating variable of a controlled semiconductor An apparatus for recovering an alternating variable having a direct current component in a controlled semiconductor component includes an electromagnetic transducer for measurement having a secondary winding. A sample and hold element has a trigger input,...	02/27/1990
4896093	Electronic inductor To produce a high current carring inductor with a high inductance value in space normally too small, a transformer is chosen which meets space requirements and has a primary winding of sufficient current capacity, but too little inductance. A bidirectiona...	01/23/1990
4839770	Control circuit with validity-determining arrangement An arrangement is provided for checking the validity of a sensed-current signal from a current-sensing device. The sensed-current signal represents the current in a line. An associated control circuit utilizes the sensed-current signal to indicate or pred...	06/13/1989
4808910	High voltage measurement transformer for suspension from a high voltage switching apparatus The current converter or transformer component of a high voltage measurement transformer comprises a primary lead or conductor which is surrounded by secondary windings or optical conducting elements. The primary and secondary components of the current co...	02/28/1989
4794318	Current transducer arrangement for outdoor high-voltage installations To increase the availability of current transducers for outdoor high-voltage installations, an electronic signal processing device for the measurement signal of the current transducer is arranged above the current transducer as a block which can be remove...	12/27/1988
4761727	Current sensing circuit for use with decoupled half bridge converter A high power half bridge converter which uses FETs. Each of the FETs has its own power transformer. This results in a decoupled series half bridge configuration which minimizes the generation of undesirable spurious r.f. signals. Current sensing circuits ...	08/02/1988
4698740	Current fed regulated voltage supply The invention is a locally isolated regulated power supply providing a regulated dc power output from an ac current source having a large dynamic range. The power supply comprises an ac-to-dc converter for providing a rectified dc output from an ac curren...	10/06/1987
4320337	Combined current and voltage converter for a compressed-gas insulated metal-enclosed high voltage installation The invention relates to a combined current and voltage converter for metal-enclosed high-voltage installations with compressed-gas filling. In order to be able to avoid any passages for the connecting leads through the housing (1, 2), the electrode of th...	03/16/1982
4317979	High current high frequency current transformer In an induction heating apparatus, direct sensing of the high frequency high power current flowing in the tank circuit to load the induction coils, is obtained with a coil current measuring transformer comprising one of the power current busses leading to...	03/02/1982
4296369	Active quadrature current reference source This reference source provides a current which is of relatively high magnitude and which leads the voltage by substantially 90°. It includes a reference capacitor which is highly stable and pure but of low capacitance, and a power capacitor which has a h...	10/20/1981
4250448	Voltmeter apparatus for cascaded transformers A direct reading voltmeter for measuring the output voltage of the final unit of a cascade connected transformer arrangement. A voltage responsive to the output voltage of the final unit of the cascade arrangement is developed across an impedance via a cu...	02/10/1981
4214199	Current transformer A high-voltage current transformer has an external inductance element electrically connected thereto. The inductance element has a relatively low magnitude of inductance, compared with the inductance of the current transformer, to cause a substantial incr...	07/22/1980
4188572	Current sensing device Devices relying on the Inverse Wiedman Effect. Devices include a current conductive, magnetically anisotropic rod, through which an AC current flows. Wound about the rod is a conductive coil having output terminals. By varying the AC current, the anisotro...	02/12/1980
4140961	Shunt circuit for an insulation type current transformer to adapt to a wide-band of frequency A current transformer for large currents having an inductive element, such as a large DC current transformer; a universal current transformer or a wide-band high fidelity current transformer, is improved by providing a shunt circuit which comprises a seri...	02/20/1979
4074335	Detecting circuit A detecting circuit comprises a magnetic core having a rectangular magnetic characteristic, a first winding coupled magnetically to the magnetic core, for applying a current to be detected, and a second winding coupled magnetically to the magnetic core, f...	02/14/1978
3995210	Variable gain electronic current transformer A variable gain electronic current transformer for detecting the current flow into a power consuming system. An operational amplifier amplifies the detected current and the output of the operational amplifier is converted into a magnetic flux field which ...	11/30/1976
3990001	Measuring transformer for installation in the metal enclosure of a switching installation A measuring transformer for installation in the metal encapsulation of a switching installation is provided with at least one ring-shaped mounting shoulder which is clamped between flanges of the metal encapsulation....	11/02/1976
3967189	Power supply for electronic circuits at high-voltage potential A power supply apparatus supplies power from a low-voltage potential to an electronic circuit at a high-voltage potential such as an electronic circuit for detecting the current in high-voltage conductors and the like. The electronic circuit is connected ...	06/29/1976
3949290	Instrument transformer with cone-shaped insulating layer An instrument transformer being applicable for a current transformer and/or a voltage transformer which is comprised of a coil for developing magnetic field related to a primary current, the Hall element for generating the voltage in response to the magne...	04/06/1976
3943433	Measuring transformer arrangement for a high-voltage installation carrying several conductors A measuring transformer arrangement is provided for a fluid-insulated high-voltage installation with metal encapsulation carrying several conductors. The measuring transformer arrangement includes at least one conducting or semiconducting tube surrounding...	03/09/1976
3942099	Measuring transformer with a capacitor bushing A measuring transformer arrangement with a capacitor bushing and devices for measuring voltage and current associated with the capacitor bushing is suitable for use in a high-voltage installation with metal encapsulation carrying several high-voltage cond...	03/02/1976

PatentStorm

Bizarre Patents

PatentStorm News

Class 323/358 - Current transformer