Showing papers on "Power module published in 1968"

Self-Adapting dc Converter for Solar Spacecraft Power Supply Selbstanpassender Gleichstromwandler für die Energieversorgung eines Sonnensatelliten

Abstract: The voltage-current characteristic of solar cells that provide power for a spacecraft can vary over a wide range. For maximum power transfer from the solar cells to the battery system a power converter has to be designed that adjusts its input impedance to a value equal to the output impedance determined by the operating power characteristic of the solar cells. This paper discusses a circuit and calculations for a design to match this condition. The proposed power converter is simple, lightweight, and reliable and will be used in the Sunblazer satellite.

Shunt regulation electric power system

Abstract: A regulated electric power system having load and return bus lines. A plurality of solar cells interconnected in power supplying relationship and having a power shunt tap point electrically spaced from the bus lines is provided. A power dissipator is connected to the shunt tap point and provides for a controllable dissipation of excess energy supplied by the solar cells. A dissipation driver is coupled to the power dissipator and controls its conductance and dissipation and is also connected to the solar cells in a power taping relationship to derive operating power therefrom. An error signal generator is coupled to the load bus and to a reference signal generator to provide an error output signal which is representative of the difference between the electric parameters existing at the load bus and the reference signal generator. An error amplifier is coupled to the error signal generator and the dissipation driver to provide the driver with controlling signals.

Two State Modulation Techniques for Power Systems.

Abstract: : This is the fourth semi-annual report on an investigation of techniques and circuitry based on the use of two-state modulation systems, directed toward development of improved advanced power conditioning equipment. Improvements are sought with respect to smaller, lighter weight, more efficient and highly reliable power processing systems. During this reporting period, two experimental power processors were designed, constructed, and tested.

Network Integration Approaches for Multiple-Diode High Power Microwave Generation

Abstract: Rapid strides are now being made in solid-state microwave power generation, With the recent introduction of negative-resistance avalanche junction diodes and gallium arsenide bulk-effect devices, a new impetus was given to research. This paper is an attempt to assess the present status of these devices and to look into the future. Solid-state devices are already displacing vacuum tubes for low power system functions, including transmitters for line-of sight communication links. What are the possibilities that they can also replace high power microwave tubes? Here, we attempt to assess the probability of success and to foresee some of the directions which such research may take. We point out certain special problems to be solved and present new circuit concepts which appear promising at this time.

Power system design for a Jupiter solar electric propulsion spacecraft

Abstract: The design concept includes a large-area photovoltaic solar array for primary electrical power, a hibernating Ag/Zn battery subsystem for energy storage, and power conditioning equipment for conversion and distribution of power to spacecraft loads.

The extent and development of machine-electronics

Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.

Regulated dc-to-dc converter features low power drain

Abstract: A regulated dc-to-dc converter requires negligible standby power for the operation of critical electronic equipment. The main operating circuitry consumes power intermittently according to load conditions, rather than constantly.

A User Looks at the Semiconductor Converter

Abstract: As one of the largest users of power converter equipment in the world, Alcoa has had a profound interest in the development of the semiconductor power converter. This paper reviews the application of large converter equipment, starting with the first major unit installed in the United States at Alcoa's Badin Works in North Carolina, and traces operations to the present. Advantages of the silicon equipment as compared with other methods of power conversion, as well as some of the engineering problems encountered, are described from the user's viewpoint.

Power Generation and Transmission System of Finland

Abstract: Water power sources in Finland which produce more than half the electrical energy are situated far from the consumption areas, thus necessitating the construction of a long-distance transmission system. Thermal power, which is rapidly gaining in importance and creates new versatility, does not change these conditions. As the economics of transmission system construction depends largely on the cost of lines, special attention was given to line design research and to system operation. This resulted, at an early stage, in adaptation of the guyed towers, characterized by low weight and cost, the design of which, in 110-, 220-, and 400-kV lines, is continuously developed. Switching stations have been simplified, shunt reactors and series capacitors installed, and remote control of voltage at power stations adopted. The economy of generation and transmission is increased by programmed regulation of water storage. Operation experiences are good and statistics display a low number of disturbances.

Power Matching of an Ion Thruster to Solar Cell Power Output

Abstract: A 20-cm-diam thruster was operated over a 2:1 range of output power, allowing for continuous matching of thruster power to a varying solar cell output level. The technique of matching power by varying either the ion beam current or the net accelerating voltage is described. Ion beam current control, implemented in thruster control loops, utilized existing laboratory hardware. Stable thruster operation was achieved over a range of 1000 to 2000 W. Bistable values of mercury propellant flow at the same discharge chamber and ion beam conditions were also observed.

Pulsed Power Supply for Electroluminescent Fiducial Display System

Abstract: A pulsed power supply has been developed which is suitable for powering electroluminescent lamps at frequencies up to 5 kHz. A distribution system for driving 90 or more lamps simultaneously and a programmed data-lamp array utilizing this power supply are also described.