Showing papers on "Power module published in 1969"
TL;DR: In this article, the authors describe a practical solid-state phase and frequency converter, where three-phase input power is converted to single-phase power of higher variable frequency output power, without the use of a dc link.
Abstract: The paper describes a practical solid-state phase and frequency converter. Three-phase input power is converted to single-phase power of higher variable frequency output power, without the use of a dc link. A brief description of the circuit is given, followed by simplified theoretical considerations and actual experimental results.
21 citations
TL;DR: In this paper, a method to choose the physical parameters of a compressed-gas-insulated cable is described, and a calculation of the power rating, losses, and critical length is carried out based on physical parameters.
Abstract: This paper describes a method to choose the physical parameters of a compressed-gas-insulated cable. A calculation of the power rating, losses, and critical length is carried out based on the physical parameters. This calculation is then compared with the ratings of pipe-type cable and is shown to be superior particularly for high-voltage, high-power applications.
15 citations
TL;DR: An S-band CW power source consisting of transistor-amplifier-driven varactor-doubler chains fabricated in hybrid integrated form is described, which has good heat sinking and low parasitic reactance and which permits direct paralleling of transistors.
Abstract: An S-band CW power source consisting of transistor-amplifier-driven varactor-doubler chains fabricated in hybrid integrated form is described. The source employs a microstrip package for high-power transistors, which has good heat sinking and low parasitic reactance and which permits direct paralleling of transistors. A breadboard model of the power source consisting of hybrid integrated components interconnected by coaxial lines produced a CW output of 9.8 watts at 3000 MHz with a 1-dB bandwidth of 6.7 percent and a dc to RF efficiency ranging from 9 to 14.5 percent over the band. The required RF input power to the module was 600 mW centered at 1500 MHz.
14 citations
TL;DR: In this paper, Pan-Africanism-Land and Power is discussed in the context of the culture of revolution in the Black Scholar: Vol. 1, The Culture of Revolution, pp. 36-43.
Abstract: (1969). Pan-Africanism-Land and Power. The Black Scholar: Vol. 1, The Culture of Revolution, pp. 36-43.
8 citations
TL;DR: In this paper, a computer program concept is described for performing an electrical analysis and a transient thermal analysis of a satellite electric power subsystem consisting of a solar array, battery, and power controls.
Abstract: A computer program concept is described for performing an electrical analysis and a transient thermal analysis of a satellite electric power subsystem consisting of a solar array, battery, and power controls. The program "flies" the power subsystem and certain thermally sensitive portions of the spacecraft through one or more complete orbits, and plots curves of voltages, currents, temperatures, and energy balance in critical parts of the power and thermal subsystems.
7 citations
TL;DR: In this paper, the authors focus on the conversion and control of large blocks of electric energy by solid-state power devices such as silicon rectifier diodes and thyristors.
Abstract: This article focuses on the conversion and control of large blocks of electric energy by solid-state power devices such as silicon rectifier diodes and thyristors. Power conversion fulfills the important requirement of delivering a desired type of electric energy when the available form is unsuitable. Examples include the energization of dc machines, dc fields, and batteries when the available source is single-phase or polyphase alternating current. Another example relates to variable-speed drives for Induction and synchronous motors when the power source is either dc or fixed-frequency ac. Power control is concerned with varying the level of power delivered to a load, as in on-off switching, or varying the output voltage of a rectifier.
5 citations
TL;DR: In this article, a power amplifier in which the outputs of 64 RCA type 2N5016 overlay transistors are combined to provide a total CW output power of 1 kW at 400 MHz is described.
Abstract: A power amplifier in which the outputs of 64 RCA type 2N5016 overlay transistors are combined to provide a total CW output power of 1 kW at 400 MHz is described. A concept is employed wherein several transistors are connected in parallel to first form a power module, and then the outputs of a number of modules are combined in a Wilkinson N-way hybrid power combiner. This combiner has built-in isolation between each of the N input terminals. An identical N-way hybrid is employed as a power divider providing equal distribution of driving signal to each of the power moduIes. An overall power gain of 33 dB is achieved by providing additional transistor stages of preamplification. CW and pulse performance of the amplifier is described. Performance of the amplifier as the driver for a high-power tetrode tube is reported.
2 citations
Patent•
22 Jul 1969TL;DR: A thermal power generating circuit utilizes diodes and transistors having matched characteristics to convert available direct current power into thermal power, which is proportional to the level of an input signal as discussed by the authors.
Abstract: A thermal power generating circuit utilizes diodes and transistors having matched characteristics to convert available direct current power into thermal power which is proportional to the level of an input signal. An insignificant amount of power is taken from the signal source.
05 May 1969
TL;DR: An all-transistor power amplifier which delivers a cw power output of 1 kilowatt at 400 MHz has been designed and fabricated.
Abstract: An all-transistor power amplifier which delivers a cw power output of 1 kilowatt at 400 MHz has been designed and fabricated. In this design approach, a number of discrete transistors are connrected in parallel to form a power module, and the outputs of a quantity of modules are then combined to achieve the desired total output power. The discrete transistor used in the amplifier is the RCA-2N5016 overlay type. When operated as a single device in an optimum 400-MHz amplifier circuit, this transistor produces a power output of 15 to 18 watts for a power input of 5 to 6 watts.
01 Jul 1969
TL;DR: In this article, an extremely high power silicon p-i-n diode switch was developed for operation over the 6 to 40 MHz frequency range, which was successfully tested at 4 MW peak power, and at 100 kW average power with 1000 µs pulsewidth in a balanced duplexer configuration.
Abstract: An extremely high power silicon p-i-n diode switch was developed for operation over the 6 to 40 MHz frequency range. It was successfully tested at 4 MW peak power, and at 100 kW average power with 1000 µs pulsewidth in a balanced duplexer configuration.
TL;DR: In this paper, the authors describe various means used in the U.S.A.R. to improve reliability of power supply and those measures introduced to improve the reliability of consumers at short time interruptions.
Abstract: -The problem of the reliability of electric supply and operation is a very complex problem involving the generation of electric power, its distribution, and the operation of electric driven mechanisms at power stations and consumers. This paper describes various means used in the U.S.S.R. to improve reliability of power supply and those measures introduced to improve reliability of consumers at short time interruptions of power supply. Due to the growth of generator and motor ratings, new problems in improving reliability arise. Problems in future improvement of reliability are listed.