Abstract: A device for the contactless inductive transmission of electric energy to a movable consumer has a stationary primary circuit designed as an arrangement of elongated parallel leads connected to a source of high frequency alternating voltage or current and a transmission head arranged on the movable consumer. The transmission head consists of a ferrite core and of a secondary winding that surrounds the ferrite core and is magnetically coupled to the primary circuit. The primary circuit lead arrangement has an outer lead designed as an almost closed housing (7) and a middle lead (6) arranged approximately at the center of the housing. The current (11) that flows in the outer lead has the same intensity but an opposite flow direction to the current in the middle lead. The middle lead (6) is surrounded by a U-shaped ferrite core (2) that carries the secondary winding (W.sub.2).

Abstract: A hybrid vehicle comprises a motor driving the vehicle's wheels, multiple batteries supplying electric power to the motor, and a generator driven by an internal combustion engine to generate electric power for charging the batteries. Battery sensors detect terminal voltages of the batteries. An ECU controls a DC/DC converter to distribute electric power to independently charge the batteries through charge lines in accordance with the shortage of charge in respective batteries when excess electrical power is available from the generator even after a required amount of electrical power from the generator is used to rotate wheels.

Abstract: A non-contact electric power transmission device comprising a feeding member which includes an induction coil to which electric power is applied and the non-contact electric power transmission device further comprising a plurality of fed members which each further comprise an induced coil placed within a magnetic field produced by the induction coil. The fed members differ in the load applied and each of the fed members is independently designed to accommodate its respective load as well as to accommodate a single feeding member. While the respective loads differ, only the design of the respective fed member is modified to accommodate the different load value while no modifications to the single feeding member are made.

Abstract: A power distribution network including a voltage support transformer is disclosed which uses the fault current from a line of the power distribution network in which a fault condition exists to support or stabilize the voltage across one or more other lines of the network connected to the same bus and seeing the same source impedance, to maintain the voltage in those lines substantially at the pre-fault levels. The voltage support or stabilization in the unfaulted line is based upon a current change due to the impedance change in the faulted line caused by the fault.

Abstract: The present invention relates to protection circuit and method for the EMI/RFI suppression system (2) of such a five-conductor electrical system in which the neutral conductor (N) is provided with a bandstop-type filter circuit (2) for the suppression of a harmonic interference current component. According to the invention, on the neutral conductor (N) is placed a current transformer (CT) having over its secondary a resistive branch (R.sub.1), and in parallel therewith, a filter branch (5) comprising a bandpass filter (LC) tuned to the fundamental frequency of said neutral-conductor filter circuit (2) and said filter branch (5) having in series with said bandpass filter branch (LC) a switch element (4) suitable for short-circuiting said neutral-conductor filter circuit (2) when current in said filter branch (5) exceeds a preset upper limit level.

Abstract: A system that monitors and controls electrical power consumption that will be retrofitted to a typical consumer electrical power arrangement (typical arrangement-electrical feed line from a provider, a meter, a circuit breaker and individual input wiring to a plurality of electrical devices, appliances and outlets). The system includes a control unit which receives information from an electromagnetic pickup device from which real time electrical consumption is determined over very short periods of time. The control unit has a main data processing and storage processor for retaining information and it may include a communication microprocessor for sending signals to corresponding modules. The electromagnetic pickup device uniquely measures the electromagnetic flux emanating at each output wire from each of the individual circuit breakers in a breaker box. The modules have filters which release electrical power to the individual electrical devices, appliances and outlets at a controlled, economic rate.

Abstract: A multiple output dc to dc converter is described that has multiple regulated output voltages. This is achieved by using a common subcircuit in conjunction with multiple input subcircuits to power multiple output circuits. The common subcircuit is used with an input subcircuit to form a converter input circuit which with a corresponding output circuit produces an output voltage. Any number of input subcircuits can be used with the common subcircuit to produce a corresponding amount of output voltages. The multiple output dc to dc converter described produces output voltage of the same quality as using parallel converters but with a cost and complexity similar to that of using inferior secondary side switches for auxiliary outputs.

Abstract: In a distributor, a plurality of switches are connected in series with one another on main distribution lines emerging from a receiver switching apparatus, thus forming a trunk. A branch line extends from a junction between each pair of adjoining switches and leads to each load via another switch and a transformer, wherein each pair of switches on the trunk is formed as a single branch unit, and the switch and transformer are united as a power package. In each power package, a supply bushing and a load bushing are placed on the top of a transformer, and shielded with closed housings. A switch is placed in the closed housing for the supply bushing, and a distribution board is placed in the closed housing for the transformer. This configuration enables the disconnection of any branch distribution lines from the main distribution lines and diminishes the installation space.

Abstract: An apparatus for transferring power and communication data across an annular gap comprises an inductively-coupled primary coil winding and secondary coil winding rotatable therein. Two signal oscillators are electrically coupled to a transistor for controlling current flow through the primary coil winding, thereby inducing a signal with a respective frequency in the secondary coil winding. An electronic switch operates so as to apply one of the two signals to the transistor for charging a capacitor coupled to the secondary coil winding, and operates so as to apply the other of the two signals to the transistor for discharging the capacitor. Actuation of control devices operate so as to modulate the impedance of the secondary coil winding. The inductive coupling of the two coil windings results in this modulation being mirrored by a modulation of the voltage developed across the primary coil winding.

Abstract: A transformer system couples a control panel with a power line to support two-way communications over the power line. A first transformer steps-down the power line voltage, supplying power to the control panel. A second transformer and associated capacitors provide a low impedance path at the communication signal frequencies and a high impedance path at the power frequency.

Abstract: A transformer, typically a miniature transformer, to provide low-voltage power between, usually, 2 to 12 V from a power network has an auxiliary winding (6) inductively coupled to the core (9) of the transformer. A reference signal is provided from the power supply, and a monitoring circuit (32), which includes a difference-forming circuit (16) is coupled to receive (a) a signal from the auxiliary winding (6) and (b) the reference signal, the difference-forming signal providing an output in dependence on the state of magnetization of the core, by evaluating differences in magnetization (.DELTA.B) depending on whether power is being supplied by the transformer, or not. A circuit interruption element (10), typically a transistor, is serially connected between the power supply (1, 2) and the transformer.

Abstract: A connector divice which can stably supply electric power and send and receive signals in a contactless way, i.e., without using any electrode contact, and without strict alignment of the device.

Abstract: A power converter comprises a first printed circuit board containing some of the circuitry of the power converter, a header comprising a support structure and a multiplicity of metallic pins passing through the support structure, and an inductor mounted to the support structure and including wires connected to respective pins. Portions of the pins on one side of the support structure are mounted to the first printed circuit board to support the header in fixed offset relation to the first printed circuit board. Portions of the pins on an opposite other side of the support structure are adapted to mount to a second, mother board to support the header in fixed offset relation to the mother board.

Abstract: An electronic device for multiplexing several loads to the terminals of a source of alternating electrical energy. The source(4) of alternating electrical energy is coupled by electromagnetic flux to the loads by using primary excitation windings 71, 81 and 91 connect to the terminals of the source (4) of alternating electrical energy and secondary windings respectively corresponding to the number of loads. The secondary windings are at least partially coupled to the primary winding and are each connected to the terminals of a load. The coupling is inhibited by auxiliary winding 73 which are each totally coupled with the secondary winding 72. The inhibition function is controlled in order to inhibit all the magnetic couplings except for one and this particular one changes as a function of the respective load to be coupled to the source 4 of alternating electrical energy.

Abstract: A power supply system to be built into a television receiver, for powering both the main electric circuitry of the TV set and a remote control receiver circuit. The power supply system comprises a transformer having a primary winding coupled to a direct current power supply via a switching transistor, and secondary windings coupled to the main TV circuitry and to the remote control receiver circuit via rectifying and smoothing circuits. Duration modulated pulses for on-off control of the switching transistor are reduced in recurrence rate when the main TV circuitry is not being powered, so that the remote control receiver circuit is powered with less switching loss than if the switching frequency is left the same as when the main TV circuitry is being powered.

Abstract: A method for regulating the voltage at which electric energy is supplied at the delivery points in a network for distributing electricity. The voltage of electric energy supplied through a high-voltage network is reduced to a voltage suitable for a medium-voltage network by means of at least one variable transformer. The voltage of the electric energy in the medium-voltage network is reduced, by means of at least one transformer, to a voltage suitable for a low-voltage network supplying the electric energy to the consumers. The adjustment of the variable transformer between a high-voltage network and a medium-voltage network is influenced by the actual voltage measured and the current or load at the output side of the variable transformer. The voltage prevailing at the delivery point is measured at the location of at least a number of consumers and the variable transformer is set partly in dependence on the voltage thus measured at the consumers' location.

Abstract: An electrical circuit incorporating an improved diode expander network for an EMAT having a coil and a radio frequency power source which emits radio frequency power, and which blocks noise and interference while having the ability to operate at high frequencies and high current/power levels. A matching transformer having a primary side is operatively connected to the radio frequency source for receiving the radio frequency power. The transformer also has a secondary side having a first leg and a second leg. The matching transformer is normally a step-down transformer. A diode expander network is provided having a first pair of composite diodes connected in parallel with respect to each other to the first leg of the transformer, and a second pair of composite diodes connected in parallel with respect to each other to the second leg of the transformer. Each composite diode has a plurality of diodes arranged in a series and parallel relationship.

Abstract: An electrical power supply for motor vehicles including an alternator arranged to receive a rotational driving input from a vehicle engine and control and switching means operative to automatically switch from operation in an alternator mode of operation to operation in a generator mode of operation in response to disconnection of the alternator from a vehicle battery.

Abstract: A non-contact electrical transformer coupling is disclosed that provides electrical power and full duplex digital communications between a host computer and a removable IC memory card. A unique two-part host magnetic core assembly having a quadrafid design forming multiple poles is provided with printed circuit windings and is disposed to receive the IC memory card embedded with core pole pieces and associated printed circuit card windings to complete the magnetic flux paths and transformer coupling. The configuration of the poles and windings form completely independent channels, each of which behaves like a wide-band ferrite core transformer. The independence of each channel enables this unique magnetic core and associated windings to couple relatively large amounts of power to the circuitry of the IC memory card and establish a high-speed bidirectional data link between the host and card.

Abstract: A power supply to supply power to a secondary system. The power supply is adapted to receive power from a plurality of primary systems. The power supply having a first rectifier which supplies power to the secondary system from a first primary system. At least one isolated rectifier which is connected to a primary system other than the first primary system. Wherein the primary system other than the first primary system provides power to the isolated rectifier. A power supply means connected to the first rectifier and the isolated rectifier. Wherein the rectifier and the isolated rectifier provide power to the power supply and the power supply provides power to the secondary system. Wherein due to the characteristic of the isolated rectifier, it is not possible to connect the first primary system out of phase with the primary system other than the first primary system, thereby eliminating unsafe voltages.

Abstract: The present invention involves a connector for inductively coupling to a multi-wire data bus utilizing a magnetic core and associated coil for inducing signals upon the bus and for sensing such signals on the bus. The connector includes a pair of magnetic members disposed on either side of the magnetic core for attenuating common mode energy generated within the connector at about the same frequency as that of the primary signal appearing on the data bus.

Abstract: An irrigation system for watering a group of large fields on which crops are grown. A water well is arranged on each field and an electric motor driven pump produces each water well. A motor/generator supplies current to an electric motor of each water well by a step-up transformer having a low voltage primary and a high voltage secondary winding to receive current from the electrical generator. The primary of a several step down transformers are connected in parallel to supply current to an irrigation pump motor. Each electric motor has a contact connected to current carrying electrical conductors that are buried below the surface of the ground. Well water is conveyed to a pivot type traveling irrigation system having a rotating coupling by which water is conveyed from said pump into the sprinkler system. All of the electrical conductors interconnecting the transformers and pump motors are placed underground.

Abstract: A distributed control system for a plant includes an electric equipment room for supplying electric power to a plurality of field apparatuses constituting parts of the plant by way of a plurality of operation terminals. Apparatuses for controlling the function units are provided distributively in the field in which the field apparatuses to be controlled are installed. Operation terminals to be controlled by the control apparatus are installed in the field.

Abstract: A process for parallel control of tap transformers in which individual voltage regulators of parallel operating transformers are connected to a single parallel processor by serial data lines and the measured values of the voltage and current amplitudes and the phase angles are transmitted by the voltage regulators to the parallel processor, an interference variable for each voltage regulator is calculated in the parallel processor from the partial load current and the circulating reactive current and is transmitted with the partial load current by the serial data lines to the voltage regulators, and each voltage regulator then calculates an LDC variable for load drop compensation, by summing the measured voltage, the received interference variable and the LDC variable provides a controlled variable or voltage value which constitutes the new set point with respect to which the voltage regulator then controls the transformer to which it is assigned.

Abstract: A six-phase power line configuration reduces the measured intensity of electric and magnetic fields that are associated with transmitting AC electric power. An open-wire configuration is taught that is compatible with transmission on power line right-of-ways, and that can be made by converting existing three-phase dual circuit power lines.

Abstract: A coupling circuit (30) connects two three-phase pulse width modulated (PWM) inverter circuits (16, 18), used in conventional manner to power a first load (12), in order to independently power a second load (32). In a preferred embodiment, the two PWM inverter circuits propel an armored vehicle, such as a tank, with one motor driving the right side, and the other motor driving the left side. The propulsion of the vehicle represents the first load. The second load is a pulse forming network (PFN), which PFN powers an electrothermal gun system carried by the vehicle. The coupling circuit includes a transformer (TA, TB, TC) and rectifier circuit (34) for each phase output of the PWM inverters. A primary winding (32) of each transformer is connected between corresponding phase outputs of the two PWM inverters. A secondary winding of each transformer is connected to a respective rectifier circuit. The output of each rectifier circuit is joined with the other rectifier outputs to charge the PFN.

Abstract: An improved data coupler assembly provides an improved electromagnet insert having conductive wires positioned within arcuate channels formed along with electromagnet insert. Sealing means to position and seal the conductor wires to the assembly are included. Improved electromagnetic shielding by using metallic plating on the upper member of the coupler assembly provides effective, but lightweight, EMF/RFI protection. A rugged resilient spring means improves the formation of an electromagnet core by biasing the electromagnet insert, and thereby biasing together each electromagnet pair form cores having a minimal air gap. A quick-action panel mounting means secures the coupler assembly to a panel, and improved aligning means precisely secures the upper member of the coupler assembly to the lower member.

Abstract: A DC power supply which is adapted to produce a DC main voltage between a main output terminal provided at one end of a first line and a ground terminal provided at one end of a second line; the power supply being characterized in that there is disposed a constant-voltage-drop means between the second line and the ground terminal; a third line extends from the second line side of the constant voltage drop means; and also an inverse polarity side output terminal is disposed at one end thereof so that an inverse polarity DC side voltage is adapted to be outputted between the inverse polarity side output terminal and the ground terminal, whereby main and side output voltage having opposite polarities can be produced through a simple construction.

Abstract: A high DC voltage power supply includes a three-phase autotransformer and a three-phase full-wave rectifier applied to the usual motor vehicle electrical system of the low DC voltage type. The low three-phase AC voltage of the usual system is transformed by the autotransformer to obtain a high three-phase AC voltage which is then rectified by the rectifier to provide a high DC voltage. The load energized by the high DC voltage is ungrounded to reduce the voltage available for inadvertent discharge from either load terminal to ground. Switching apparatus is provided for selectively applying the low three-phase AC voltage to the autotransformer only when it is desired to energize the load thereby avoiding at all other times the energy losses that would otherwise be associated with energization of the autotransformer. In one embodiment, the load is windshield heater element and the autotransformer has multiple sets of input taps to provide deice and defog modes of operation, respectively.

Abstract: A power source device including a lower voltage inverter transformer having plural secondary windings and a higher voltage inverter transformer having a primary winding connected directly to one of the secondary windings of the lower voltage inverter transformer without any rectifying circuit or inverter circuit interposed therebetween. The lower voltage and higher voltage transformers are contained in the same casing, the internal space of which is filled with an electrically insulative material to provide a unit device.

Abstract: A power supply for negative impedance discharge loads such as discharge tubes used in gas laser systems, in which the discharge power is supplied not from the voltage source but from the current source through the current transformer so that stabilized and well balanced discharge currents can be supplied to a plurality of discharge loads.

Abstract: A power circuit for N series connected loads according to the present invention includes N transformers having primary windings connected in series across a constant current AC source and secondary windings connected in series with the N loads. N-1 conductors are coupled from a junction between the loads to a corresponding junction between the secondary windings. Failure of one of the loads resulting in an open circuit will not interrupt power to the remaining loads.

Abstract: An auto-transformer has first and second input terminals and first, second and third output terminals, the second output terminal being connected to a center tap of a coil and the first and third output terminals being connected to such points of the coil which are symmetrical with respect to the center tap. The first and second input terminals are connected to such points of the coil which are symmetrical with respect to the center tap. A first group of loads is coupled across the first and second output terminals and a second group of loads is coupled across the second and third output terminals. By equalizing the load currents to the first and second groups, the total current of the auto-transformer can be made significantly small.

Abstract: A coupler assembly for noninvasive coupling to conductor wires of a twisted pair cable of a data bus uses mating pairs of E-shaped electromagnets defining a pair of electromagnet cores having windings about central legs thereof electrically connected to a control unit for sensing and transmitting signals along the data bus. A lower member with lower electromagnets is mounted to a panel, while an upper member with upper electromagnets includes a circuit substrate having trace windings about substrate apertures receiving the central legs of the upper electromagnets, an electronic subassembly to which the windings are electrically connected to amplify signals received and signals to be sent, and a shielded electrical connector secured at a connector end connected to circuits of the electronic subassembly and matable with a connector of a cable extending to the control unit.

Abstract: A telephone power isolation system that will provide fused AC or DC power for multiple individually isolated telephone circuits using a single AC powered inlet and a multiple pair telephone connector for output connections. LED indicators are provided to illuminate and indicate a blown fuse condition that can be remotely observed and immediately identified.

Abstract: An interconnect device permits use of 150 ohm twisted pair transmission lines to interconnect computers designed for use with 75 ohm coaxial cable. The device includes a pair of toroidal transformers mounted in an aluminum housing and separated by a Faraday shield. The primary winding of each transformer is connected to a separate coaxial connector. The second winding of each transformer is connected over a separate a twisted conductor pair to one terminal of a balanced data connector assembly.

Abstract: A ferroresonant regulator for use in an inductively coupled high frequency power distribution system. A constant current resonant power source, comprising a sine wave oscillator (12), an amplitude controlled amplifier (16), a power amplifier (20), and an impedance matching transformer (24), provides current at a frequency of 38 kHz to a supply loop (68) that is installed in the floor of an aircraft passenger space. A current sensing transformer (32), and a voltage sensor (46) produce feedback signals that are used to control the amplitude of the current circulating in the supply loop, maintaining it substantially constant. A plurality of multiturn coils (70) are disposed proximate the supply loop. Connected to each of the multiturn coils is a saturable transformer (76), which includes a secondary winding attached to a load comprising an entertainment and passenger service system installed in each seat. A tertiary winding (106) on the saturable transformer is connected across a resonance capacitor (108).

Abstract: A switching mode power supply circuit designed to apply an operating power to the load when a relay connected to the remote control part is driven. The switch of the relay is connected to the base of the switching transistor, and the secondary winding of the transformer for making the electric power flow to the base of the switching transistor is connected to the terminals fixed on each side of the switch of the relay through the base current supply and absorption parts, respectively. Thereby, the base current of the switching transistor is varied in accordance with the driving state of the relay. The switching mode power supply circuit is operated stably regardless of the state where the operating power is applied only to the remote control part or the state where the operating power is applied to both the remote control part and the load.

Abstract: A method of and circuit for applying an electronic supply to two independent load circuits. An AC generator has a variable cyclic ratio. It is connected to two parallel rectifying circuits which are in series respectively with the two loads. The cyclic ratio of the alternating signal from the generator is altered. Thus, modifying the power delivered to each of the loads, because the rectifying circuits only rectifies one alternation of the complete AC signal from the generator. The power from the generator may be delivered to one or the other load or even to both load simultaneously.

Abstract: The present invention relates to a switching device for use in a series loop circuit, and more particularly to a switching device for uncoupling defective circuit components from the series loop circuit, for conducting quick trouble-shooting procedures to locate breaks or shorts in the circuit, and for enabling efficient preventive maintenance programs of the circuit components in order to keep them in good repair, with minimal shutdown time of the circuit or interruption in the supply of power to remaining circuit components. The device according to the invention includes a multi-position selector switch which permits in-situ testing of the circuit components so that down-time of the circuit is significantly reduced, and ease of maintenance is enhanced.

Abstract: A method for reducing voltages required by in-place proximity-effect circuits includes providing uninsulated conductors which extend from a main transformer station to remote feed-node locations for connection to insulated conductors within a heat-tracing pipe.

Abstract: An alternating power supply system is provided with a circuit which employs a transformer having three windings. The primary and secondary windings are wound in the direction upon a magnetically permeable core. A third winding is connected to a load and produces flux in the core in the opposite direction. The magnetic field produced by the third winding proportionally decreases the power input of the primary winding while maintaining the power output of the secondary winding. The circuit thereby reduces the power drain necessary to operate a given load.

Abstract: A DC power supply capable of providing a number of output voltages, including a balanced positive and negative voltage supply for integrated circuit applications, includes a transformer having primary and secondary windings. A diode bridge rectifier circuit is connected across the secondary winding end terminals for providing a DC output voltage of one polarity with respect to ground. Another DC output voltage of opposite polarity is developed by AC coupling a voltage multiplier circuit between one of the secondary winding terminals and ground. DC regulator circuits are included for regulation of the DC output voltages under load conditions.

Abstract: A proximity effect heat-tracing system in which proximity effect heat-tracing circuits are fed in either direction from a plurality of feed points connected to a single main transformer to increase the length of pipeline supplied by a single main transformer. A secondary transformer interposed between a main transformer and a plurality of feed points reduces the voltage required to be applied to a proximity effect heat-tracing system of a given length. Two or more proximity effect heat-tracing systems used along the same length of pipeline, employ neutral conductors having approximately the same diameter as "hot" conductors where the secondary of the main transformer in each system is 180.degree. electrically out of phase with the secondary of the main transformer in the other system.

Abstract: A series type ferroresonant regulator is modified by adding a second ferro-capacitor in parallel with the primary winding of the saturating transformer. This arrangement allows the transformer to operate at a much cooler temperature than is possible with a conventional series ferroresonant regulator of the same power rating.

Abstract: A simplified balancing impedance (Z.sub.2) included in a transformer fork has a constant capacitor (C.sub.5) connected in series with the termination resistor (R.sub.1). The variable capacitance in the balancing impedance contains a resistor-capacitor network (R.sub.2, C.sub.6 ; R.sub.3 C.sub.7, C.sub.8 -C.sub.11) connected in parallel with the termination resistance. The constant capacitor and the center point capacitor (C.sub.2) on the balancing side of the fork can thus be replaced by one capacitor.

Abstract: A low-voltage system is disclosed for supplying operating power to high-voltage neon light tubes located within housings in the forms of letters and other shapes commonly used for illuminated advertising on the outside of buildings. Within the building, a first step-down transformer is connected to the conventional household power supply of 110 volt 60 Hz current. The step-down transformer produces a low-voltage signal in the range of 16 to 24 volts at the 60 Hz operating frequency. The low-voltage wires are passed through the exterior wall of the building on which the advertising sign housing is mounted and require no special precautions or high-voltage insulation due to the extremely low voltage involved. Within each high-voltage lamp housing, a solid state low-voltage to high-voltage conversion circuit is mounted. The input to this circuit comprises the 16 to 24 volt 60 Hz low-voltage current.

Abstract: An alternating current feeder system for use in trolley assisted dump trucks has a feeder circuit of a.c. system including a Scott connection transformer used as a main substation, main- and T-winding sections having a phase difference of 90 degrees on the secondary side of the transformer and serving to transform three-phase a.c. power into single phase one supplied to feeder substations, single phase transformers respectively installed in the feeder substations, each being adapted to drop the voltage applied on trolley wires to the level required for the latter, and a different phase section provided in a boundary defined between the single phase transformers.

Abstract: A base drive circuit for power transistors uses a base drive transformer in a dual mode, as a voltage transformer when it is driven to switch on or off, and as a circuit transformer when the transistor is conducting. Particularly a single base drive is used to drive a plurality of base drive transformer, each base drive transformer acting in the dual mode. This isolates the power transistors from each other and avoids differences in switching characteristics of the power transistors from affecting each other.

Abstract: A circuit is described for controlling voltage input to a pair of resistances. A main transformer and variable auto transformer are wired in cascade between the voltage supply and the resistances. The resistances are wired in series to the output of the variable auto transformer, with the null point between the resistances being connected to the variable tap of the auto transformer.