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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...
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...
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...
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...
6727791 Capacitive voltage transformer  
A capacitive voltage transformers for distribution of the power from 10 kv high potential line, includes a insulating column with a high potential terminal, a ground terminal and capacitors C1 and...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 R L through the secondary winding of a coil in the direction corresponding to the direction of...
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...
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...
5450076 Method for reducing power loss in devices for contactless data and energy transmission, and apparatus for performing the method  
Devices for contactless data and energy transfer include a stationary part having at least one coil for data and energy transfer, and a moveable part having at least one coil for data and energy...
5424626 Tuned A.C. power systems compensator having variable reflective impedance for linear and non-linear reactive load compensation  
The present invention provides means to instantaneously optimize reactive kva for an a.c. power system containing both linear and non-linear reactive loads. The preferred means utilizes a reflux...
5408165 Device comprising a multiphase load, a static converter and inductance coils  
The device comprises inductance coils (6) which are each allocated to one phase and which are wound around a common magnetic core in the same direction and with the same number of windings. One...
5369355 Compensation circuit for transformer linearization  
Method and apparatus for linearizing the performance of electrical transformers using negative feedback. Two circuits are disclosed which use an operational amplifier to compensate a three-winding...
5325046 Inductive wireless data connection  
A system that allows inductive connectors to be electrically coupled without having to mechanical align the same. The connectors have a primary coil coupled to a secondary coil. The primary coil...
5300744 High-frequency heating device employing switching type magnetron power source  
A high-frequency heating device includes a power converter for converting an electric power from a commercial power source or the like into a high-frequency power, a step-up transformer having a...
5276394 Compensated transformers  
A transformer having a primary winding and a secondary winding across which load is coupled is compensated. A third winding is provided on the transformer. A first output terminal of an amplifier...
5274704 Transformer telephone line interface circuit  
A telephone line interface circuit includes a transformer provided with first, second and third windings. The first winding is connected across the tip and ring wires of the telephone line and the...
5150046 Noise-shielded transformer  
A noise-shielded transformer is constructed with a toroidal core having mounted thereon a secondary winding, a bifilar shield winding, a conductive plate, an insulating member, a high voltage...
5122725 Negative feedback power supply apparatus  
In a power supply apparatus for a load such a toroidal core testing apparatus, an input current is supplied to the load, and an output voltage of the load is obtained. A current corresponding to...
5093613 Transformer  
A transformer with interference suppression includes a primary winding (1) with a first primary coil (27), one end of which is connected to a primary reference point (19), and also includes a...
5047911 Device for a unipolarly operated electrical circuit component  
The invention relates to a device (20) for a unipolarly operated component (9) capable of storing energy. This device (20) can be applied, for example, in an asymmetrical half bridge circuit (1)....
5008612 Current sensor  
A current sensing apparatus includes a first transformer having a core which is cyclically driven into forward and reverse saturation, and a second transformer having a separate core. The sensing...
5001318 High frequency heating apparatus with abnormal condition detection  
A microwave oven includes a step-up transformer having primary and secondary windings, an inverter inducing a high frequency oscillating current at the primary winding of the transformer by an...
4967145 Active current transformer  
An active current transformer has a primary conductor in which a current is to be measured and a secondary conductor in which a measuring current is generated in use. A feedback sensor provides an...
4933626 Methods and apparatus for controlling power amplifiers driving highly inductive loads  
Techniques for operating a power amplifier in driving a highly inductive load are provided. More particularly, the voltage across a coil load is integrated to obtain a signal representative of the...
4910452 High frequency AC magnetic devices with high efficiency  
Efficient high frequency operation of magnetic devices is achieved by utilizing ferrites that have a low power dissipation hysteresis characteristic and by designing these magnetic devices to...
4887028 Watthour meter with isolation transformers having a feedback loop  
A voltage transducer in a watthour meter, for sensing AC line voltage across a load, includes a current transformer having its primary winding connected in series with a current-limiting resistor...
4866366 Negative feedback power supply apparatus  
In a power supply apparatus for a load such a toroidal core testing apparatus, an input current is supplied to the load, and an output voltage of the load is obtained. A current corresponding to...
4795969 Load loss standard for testing and calibrating high voltage power measuring systems  
A current-comparator technique for obtaining a load loss standard with adjustable loss tangent (or power factor) for in-situ calibration of transformer loss measuring system is described. The load...
4767980 Inductance multiplier circuit  
A circuit for increasing the apparent inductance presented by a transformer to a differential signal. The circuit may be used in a battery feed interface circuit for providing battery power to a...
4721900 Self-generated converter filter  
The reduction of non-monotonic degradation characteristics induced in the output signals in high-power applications of a transformer which has a primary winding and n secondary windings which have...
4689735 Power supply for single-phase traction system  
A traction power supply system in which one, two or three single-phase traction loads are supplied from a 3-phase high voltage system. Balancing of the load in each phase of the high voltage system...
Matches 1 - 50 out of 104 1 2 3 >