Showing papers on "Maximum power transfer theorem published in 1979"

Load Supplying Capability of Generation-Transmission Networks

Abstract: This paper describes an extension of the power transfer capacity calculation to the calculation of maximum power system loading. This loading capability is a function of the generation and transmission capacity of the power system. The dc power flow equations provide a basis for the development of constraint equations necessary in the linear programming optimization of the generation-transmission system. An example is provided to illustrate the concepts of the load supplying capability of the power system, and the application to assessment of network adequacy and long range planning is discussed.

R.F. Sputtering apparatus including multi-network power supply

Abstract: Apparatus for radio frequency sputtering in the megahertz range, primarily higher than about six megahertz, in which the target and anode electrodes are at a low input impedance reactively such that the transfer of power to the target for practical sputtering is normally difficult. The useful plasma which provides the sputtering action has an effective high impedance which obtains between the electrodes during the sputtering process, this high impedance being shunted by a capacitive reactance made up of parasitic paths and similar capacitive components. A string of at least three resonant networks is arranged between the high frequency r.f. source and the sputtering electrodes and these networks transform impedance and voltage from one end of the string at the source to different values and conditions at the other end of the string where they are tied to the electrodes in order to achieve a maximum of overall power transfer efficiency. The invention provides for tuning of the networks, matching of the impedances and variations of circuitry to achieve the desired ends for different types of sputtering target configurations.

Testing a prototype inductive power coupling for an electric highway system

Abstract: A Dual Mode Electric Transportation (DMET) system is under development in which energy is electromagnetically transferred from a powered roadway to moving vehicles without mechanical contact. Energy from the roadway can be used for high-speed, long range travel, and for replenishing energy stored in the vehicle in batteries or flywheels. The stored energy is then availble for short-range travel off the powered highway network. A static prototype of the inductive power coupling has been built and tested. Power transfer was demonstrated to conform to the models developed in an earlier phase of the project. The prototype was used to study the power of coupling mechanism and resulting design improvements are incorporated. Tests of properties of the coupling included electrical characterization of the prototype equipment, measurements of the magnetic force between power source and pickup, measurements of coupled power versus pickup airgap and offset, measurements of magnetic flux in and around the prototype, and measurements of thermal effects induced by coupled power. The tests resulted in several design improvements which were incorporated into the coupling design. Results from the power coupling study were used to aid in the design of the dynamic prototype, in which a fifty meter powered test track and electric car with power pickup will be tested.

Electromagnetic discharge apparatus with double-ended power coupling

Abstract: An electromagnetic discharge apparatus has a power coupling fixture which couples power to both ends of an electrodeless discharge vessel and produces a substantially uniform arc. Power can be coupled to the fixture from two high frequency power sources or can be coupled from a single high frequency power source by using a power divider. If power is coupled to the electrodeless discharge vessel from a single source, power transfer to the vessel is optimized when the electrical length of the circuit is an integral number of wavelengths. In an alternative embodiment, a second coupler is utilized in a conventional electrodeless light source to shape the electric fields and produce a more uniform arc.

Power transfer relay circuitry and method of phase measurement

Abstract: Power transfer relay circuitry is disclosed for providing synchronous transfer of power such as from an auxiliary source or system to a motor or motor bus; the circuitry effects the transfer of power when the phase difference between the motor bus and the auxiliary power source is very nearly zero degrees.

Power divider with randomly varying incremental power transfer

Abstract: By randomly varying the difference in the phase constants and/or the coupling coefficient along the lengths of two or more wavepaths, an equal division power divider is obtained whose operation is not critically dependent upon its dimensions.

Circuit for two wire type series data communication and power transfer

Abstract: A binary data signal is superimposed on the power line which is connected to the main system(A) and the sub-system(B), therfore the transmission and reception of DC binary data is possible by a halfduplex series unsynchronizing method. Salient features of the circuit include use of only two lines, reducing the complexity of the circuitry and amount of wire needed.

Power/energy: Exploiting wave power: To realize the promise, engineers must deal with unique power-transfer modes, erratic seas, and unfavorable economics

Abstract: Considers the exploitation of wave power as an energy source describing the power conversion devices of the wave-power systems under current study. The author points out the economic competitiveness of wave power to the established forms and concludes in saying that for wave power to become viable, its cost has to decrease significantly, which can only occur through better technology.

Power transfer apparatus for railroad track circuits

Abstract: At the remote end of a Type C track circuit, the conventional diode and the winding of a power transfer relay connected in multiple are connected across the rails over a transfer relay front contact. This transfer relay and the track relay at the near end are normally energized by the same half cycle of track current from the alternating current (AC) source. If the AC source fails, a track battery is connected across the rails at the remote end in series with the diode and transfer relay multiple network over a transfer relay back contact. The diode is so poled that the track relay is energized from the track battery with the same polarity as the rectified alternating current and does not release during the transfer operation. The diode bypasses substantially all track battery current away from the transfer relay. When the AC source is restored, the transfer relay is initially energized by the rectified alternating current through a low impedance capacitor, connected in multiple width the track battery and transfer relay back contact, and picks up to restore normal track circuit operation.

Power transfer circuit

Abstract: This is a power transfer circuit for transferring power from a d.c. input (11) to a load (12) by way of an air gap (13) in a ferromagnetic core (14), so that there is contactless transfer of energy across the gap. The core includes an input winding (16) whose inductance depends upon the length of the air gap (13), and which inductance determines the resonance frequency of an oscillator including a capacitor (22) connected across the winding (16). The oscillator includes a pair of switching transistors (T1) and (T2) and generator sinusoidal oscillations.