Showing papers on "Power module published in 1982"
01 Jan 1982
TL;DR: In this paper, a new power semiconductor device called the Insulated Gate Rectifier (IGR) is described, which has the advantages of operating at high current densities while requiring low gate drive power.
Abstract: A new power semiconductor device called the Insulated Gate Rectifier (IGR) is described in this paper. This device has the advantages of operating at high current densities while requiring low gate drive power. The devices exhibit relatively slow switching speeds due to bipolar operation. The results of two dimensional computer modelling of the device structure are compared with measurements taken on devices fabricated with 600 volt forward and reverse blocking capability.
227 citations
14 Jun 1982
TL;DR: In this paper, a new solar cell power supply system is presented, in which the boost type bidirectional dc-dc converter and the simple control circuit with a small monitor solar cell are employed to track the maximum power point of the solar array.
Abstract: New solar cell power supply system is presented, in which the boost type bidirectional dc-dc converter and the simple control circuit with a small monitor solar cell are employed to track the maximum power point of the solar array. It is confirmed by the experiment that the new system has the sufficiently precise tracking operation performance and the satisfactorily high power efficiency. Also, a comparison of the power efficiencies is made with theoretically as well as experimentally on the new and the conventional solar cell power supply systems. As a result, it is revealed that the new system is superior to the conventional one in the power efficiency.
39 citations
Patent•
09 Jul 1982
TL;DR: In this article, a power supply for an arc lamp comprises a power source and an inverter, the power source being a constant current source and the inverter being a bridge network of field effect transistors switched by square wave pulses from an oscillator so that the output of the bridge network comprises alternating square-wave pulses of equal duration for driving the lamp.
Abstract: A power supply for an arc lamp comprises a power source and an inverter, the power source being a constant current source and the inverter a bridge network of field effect transistors switched by square wave pulses from an oscillator so that the output of the bridge network comprises alternating square wave pulses of equal duration for driving the lamp. The oscillator pulses are fed by way of opto-isolators to the bridge transistors. The constant current source and bridge network are provided as a power module for parallel connection with like modules and the oscillator is of modular form and serves as a common oscillator for the power modules.
31 citations
TL;DR: In this paper, the basic principles of the operation of bipolar and field effect power transistors and thyristors are discussed, and a discussion of phenomena of special interest for power devices; junction avalanche breakdown, the effect of the current level on the current gain, dynamic and static behaviour at high currents and thermal properties and instabilities.
Abstract: Semiconductor power devices are designed to rapidly switch or amplify high currents, to support high voltages, and to control electric power. Because of these requirements, their topographies and structures are different from those of small-signal devices. Specific designs are the result of the understanding of the physics of p-n junction HV breakdown, gain variation at high currents, current instabilities, etc. After introducing elementary semiconductor structures, the author reviews the basic principles of the operation of bipolar and field-effect power transistors and thyristors. This is followed by a discussion of phenomena of special interest for power devices; junction avalanche breakdown, the effect of the current level on the current gain, dynamic and static behaviour at high currents and thermal properties and instabilities. The review includes recent advances in device physics and introduces the reader to new methods of improving device performance. Power is a relative concept-at microwave frequencies at few watts is a very large quantity; this review therefore includes a section on microwave power devices.
22 citations
Patent•
03 Nov 1982
TL;DR: In this article, a p.w.m. type power supply is used to increase the efficiency by eliminating some of the pulses used to drive the power switching means of the supply.
Abstract: A circuit for use in a p.w.m. type power supply for increasing the efficiency thereof when the supply operates at low power levels. The circuit increases the efficiency by eliminating in a predetermined manner some of the p.w.m. pulses used to drive the power switching means of the supply.
19 citations
TL;DR: In this article, a comparison of advanced heat engines for use on the dish power module is presented in terms of the performance potential of each engine as weighed against its requirements for advanced technology development.
Abstract: A paraboloidal dish solar thermal power plant produces electrical energy by a two-step conversion process. The collector subsystem is composed of a two-axis tracking paraboloidal concentrator and a cavity receiver. The concentrator focuses intercepted sunlight (direct, normal insolation) into a cavity receiver whose aperture encircles the focal point of the concentrator. At the internal wall of the receiver the electromagnetic radiation is converted to thermal energy. A heat engine/generator assembly, which is mounted directly behind th receiver, then converts the thermal energy captured by the receiver to electricity. Developmental activity has been concentrated on relatively small power modules which employ 11- to 12-m-diam dishes to generate nominal power levels of approximately 20 kW. A comparison of advanced heat engines for use on the dish power module is presented in terms of the performance potential of each engine as weighed against its requirements for advanced technology development. Three advanced engine possibilities are considered. These are the Brayton (gas turbine), Brayton/Rankine combined cycle, and Stirling engines. All three engine candidates are attractive in terms of overall system performance potential.
7 citations
7 citations
6 citations
15 Jun 1982
TL;DR: In this paper, a high power GaAs FET amplifier with an output power of 40 watts at 4.5 GHz has been developed and power conbining loss of 1.1 dB was investigated.
Abstract: A high power GaAs FET amplifier with an output power of 40 watts at 4.5 GHz has been developed. Power conbining loss of 1.1 dB was investigated and cooling system using heat pipe was developed.
Patent•
[...]
TL;DR: An improved power device module comprises a power transistor or power resistor attached to a dielectric substrate such as beryllia ceramic, which, in turn, is attached to an aluminum heat exchanger with a structural adhesive as discussed by the authors.
Abstract: An improved power device module comprises a power
device such as a power transistor or power resistor attached
to a dielectric substrate such as beryllia ceramic, which, in
turn, is attached to an aluminum heat exchanger with a
structural adhesive.
Patent•
20 Dec 1982
TL;DR: An electrical power convbrsion system for connecting an input source (11) to an a.c. electric power generation grid (13), such as a public utility, including means (27, 26) for absorbing power from the input source and for converting it to power at the nominal frequency, f0, of the grid, was presented in this article.
Abstract: An electrical power convbrsion system for connecting an input source (11) to an a.c. electric power generation grid (13), such as a public utility, including means (27, 26) for absorbing power from the input source (11) and for converting it to power at the nominal frequency, f0, of the grid (13), and further including means (27, 26) for absorbing power from the grid (13), at frequencies above and below f0, and converting it to power at f0.
Patent•
19 Apr 1982
TL;DR: In this paper, the cooling capacity of a room air conditioner is obtained by bringing a heat dispersion plate into contact with a cooling pipe projected from a cooler built in a room AC to thereby cool the power module.
Abstract: PURPOSE:To make it possible to efficiently cool the room and omit radiation fins by bringing a heat dispersion plate into contact with a cooling pipe projected from a cooler built in a room air conditioner to thereby cool the power module. CONSTITUTION:A power module 11 is formed by a copper plate or the like, and has a heat dispersing plate 15. A part of a copper-made cooling pipe 4 projected on the side surface of a cooler 3, is brought into contact with the back surface of the heat dispersing plate 15 in a spiral manner. A power module 11 is fixed sidewise on an electric mounting plate 8 by a fixing screw 16, while a power substrate 10 is dispersed sidewise on the electric mounting plate 8 located at a position in opposite thereto, and both are connected electrically to each other by means of a lead wire 13. The cooling capacity of the air conditioner is amply 100W or more, and is almost infinity with respect to the calorific value of the power module of 30W. Accordingly, the cooling capacity of high efficiency can be obtained.
Patent•
17 Mar 1982
TL;DR: In this article, a camera has a capacitor connected between DC power source lines and at least one electrical circuit connected between the power source line, each of the electrical circuits including a semiconductor switch element in the current route between the source and sink, a device for controlling the power supply to each electrical circuit includes main switch means provided between the sink and sink for applying a bias current to the semiconductor element.
Abstract: In a camera having a capacitor connected between DC power source lines and at least one electrical circuit connected between the power source lines, each of the electrical circuits including a semiconductor switch element in the current route between the power source lines for interrupting the current flowing through the circuit, a device for controlling the power supply to each of the electrical circuits includes main switch means provided between the power source lines for applying a bias current to the semiconductor element.
TL;DR: In this article, the analysis of power systems with more than three phases is discussed and it is shown that the six-phase elements can be replaced by equivalent three-phase element.
Abstract: In this letter the analysis of power systems with more than three phases is discussed. It is shown that the six-phase elements can be replaced by equivalent three-phase elements. The load-flow algorithms and the techniques for the computation of short-circuit currents, which are available for three-phase power systems, can hence be used for six-phase and other high-phase-order power systems.
14 Jun 1982
TL;DR: In this article, the main circuit is composed of only two integrated power modules, the one is three phase bridge-connected rectifier module consisting of three thyristors and three diodes, and the other is three-phase bridge connected transistor inverter module consisting consisting of six Darlington transistors, six free-wheeling diods and one auxiliary diode.
Abstract: The general purpose variable frequency inverter was developed. The main circuit is composed of only two integrated power modules, the one is three-phase bridge-connected rectifier module consisting of three thyristors and three diodes, and the other is three-phase bridge connected transistor inverter module consisting of six Darlington transistors, six free-wheeling diodes and one auxiliary diode. A custom-mode LSI is used in the control circuit associated with ROM which includes many voltage-frequency control patterns for general purpose motor drives. The transistor inverter has three voltage control modes, that is, PAM mode, PWM mode and combined mode, in order to improve the adaptability for fast response or quiet drives.
TL;DR: This high voltage system consists of a 64 channel CAMAC control module and various power modules which can optionally be located in CAMAC crates.
Abstract: This high voltage system consists of a 64 channel CAMAC control module and various power modules which can optionally be located in CAMAC crates. Power is generated by VMOS transistors in a high frequency, high efficiency circuit. A table driven processor in the control module provides a variety of self-monitoring features without the software complexity of a microprocessor.
15 Jul 1982
TL;DR: In this article, the development status and test results for the Small Community Solar Thermal Power Experiment (SCSPE) were presented with emphasis on the receiver, the plant control subsystem, and the energy transport subsystem.
Abstract: The development status and test results for the Small Community Solar Thermal Power Experiment are presented. Activities on the phase 2 power module development effort are presented with emphasis on the receiver, the plant control subsystem, and the energy transport subsystem. The components include a single prototype power module consisting of a parabolic dish concentrator, a power conversion assembly (PCA), and a multiple-module plant control subsystem. The PCA consists of a cavity receiver coupled to an organic Rankine cycle engine-alternator unit defined as the power conversion subsystem; the PCA is mounted at the focus of a parabolic dish concentrator. At a solar insolation of 100 W/sq m and ambient temperature of 28 C (82 F), the power module produces approximately 20 kW of 3-phase, 3 kHz ac power, depending on the concentrator employed. A ground-mounted rectifier to the central collection site where it is supplied directly to the common dc bus which collects the power from all modules in the plant.
TL;DR: In this article, the authors investigated the amount of electrical power required, on top of thermal energy needs, in order to generate and deliver the cooling effect of solar absorption cooling systems as compared with the electrical power needs of equivalent vapour compression cooling systems.
07 Jun 1982
TL;DR: In this paper, the ability of encapsulation materials to meet high-stress electrical and differential thermal requirements common to high-voltage power supplies was evaluated using voltage breakdown, concentric-cylinder, and mini-wound transformer evaluation.
Abstract: Tests that distinguish encapsulation materials for high-voltage power supplies are discussed in this paper and include voltage breakdown, concentric-cylinder, and miniwound transformer evaluation. These tests all yield information on the ability of encapsulation materials to meet high-stress electrical and differential thermal requirements common to high-voltage power supplies. In addition, tests with miniwound transformers evaluate the ability of encapsulation materials to fill microvoids of intricate designs and protect the device from high-voltage and differential thermal stresses.
TL;DR: In this article, the authors report on recent developments in the power system field including fuel cell power plants, combined cycle power plants and wind generators, MHD power generation, superconducting generators, power transformers, and metal oxide surge arresters.
Abstract: Reports on recent developments in the power system field including fuel cell power plants, combined cycle power plants, wind generators, MHD power generation, superconducting generators, power transformers, and metal oxide surge arresters.
TL;DR: Lower-cost electrical systems for small aircraft can be achieved by integrating the electrical system control functions with an aircraft integrated avionics system, and several integration techniques that have potential are now being studied and are discussed.
Abstract: Advanced control techniques for aircraft electrical power distribution systems are discussed. These advanced distribution systems combine solid-state power switching with computer control to provide automated control, adaptive load management, self-test, operational flexibility, and fault-tolerant performance. Lower-cost electrical systems for small aircraft can be achieved by integrating the electrical system control functions with an aircraft integrated avionics system. Cost savings in hardware and software development and maintenance may offset the disadvantages associated with the use of standard processors and higher levels of subsystem integration. Several integration techniques that have potential are now being studied and are discussed in this paper.
TL;DR: In this article, the authors examine the future potential of solar power with regard to its applications and suggest that although the large size and small power output of solar cell electric systems are obstacles to high power usage, realistic low power applications can make a valuable contribution to world energy needs.
Abstract: The author examines the future potential of solar power with regard to its applications. He suggests that although the large size and small power output of solar cell electric systems are obstacles to high power usage, realistic low power applications can make a valuable contribution to world energy needs
01 Oct 1982
TL;DR: In this paper, the authors have completed the systematization of power transistor devices of 500 V and 1000 V in breakdown voltage, and max. 200 A in current capacity, which can be applied to large capacity power converters with compact structure and high performance.
Abstract: We have completed the systematization of power transistor devices of 500 V and 1000 V in breakdown voltage, and max. 200 A in current capacity. Since the electrical characteristics and package structure of these power transistors are designed to meet the circuit designers' requirement sufficiently, they can be applied to large capacity power converters, with compact structure and high performance provided. This paper reports the features of the new power transistors, the technique of application to power converters, and examples of the transistorized power converters.
01 Oct 1982
TL;DR: In this paper, performance evaluation and characterisation of GaAs Power FETs for the purpose of assessing their suitability for space applications are discussed, and the results obtained from these amplifiers at 1.5, 4 and 12 GHz are presented.
Abstract: Techniques for performance evaluation and characterisation of Ga As Power FETs for the purpose of assessing their suitability for space applications are discussed. These techniques were used to evaluate commercially available FETs at L, S and X band and to select suitable devices for construction of single stage power modules in each band. Results obtained from these amplifiers at 1.5, 4 and 12 GHz are presented.