Showing papers on "Power module published in 1986"

Power Electronics and Ac Drives

Abstract: An integrated treatment of technological advances in power electronics Add this article to private library Remove from private library Submit corrections to this record View record in the new ADS and ac drives is presented. The topics include: power semiconductor devices, ac machines, phase-controlled converters and cycloconverters, voltage-fed inverter drives, current-fed inverter drives, slip powercontrolled drives, control of induction and synchronous machines, and microcomputer control. Both practical and theoretical aspects of the technology are addressed, and numerical examples are given. Bibtex entry for this abstract Preferred format for this abstract

Power supply module

Abstract: Disclosed herein is a power module which is simple in assembly and which allows efficient release of heat generated by a converter transformer and power devices on primary and secondary circuits which are electrically separated from each other. The power module is of a construction such that a converter transformer, a primary circuit board on one side of which a part of the primary circuit of a switching power supply unit is integrated, and a secondary circuit board on one side of which a part of the secondary circuit of the switching power supply unit is integrated are three-dimensionally joined into an integral module by a resin of high thermal conduction and electrical insulation properties, the device-mounted sides of the primary and secondary circuit boards facing each other. The transformer may be placed between the two circuit boards or, alternatively, in parallel and adjacent to the two circuit boards.

Avionic control system

Abstract: An all-electric powered flight control system for an aircraft incorporating fault-tolerant avionics combined with a redundant power actuation control system utilizing electro-mechanical devices for actuating aerodynamic control surfaces; and wherein, the redundancy is implemented through the division of the total aerodynamic surface area to be actuated into multi-segments, with each control segment having its own channel in the avionic control system. The avionic control system is effective in minimizing the effects of power actuated control loads reacting through aircraft structure by the incorporation of an electronic gain control power module which is positioned between the power output side of an actuator (e.g., an electro-mechanical or electro-hydraulic device) and the aerodynamic control surface or segment being actuated. Further, the avionic control system includes means for passivating a single control segment of the multi-segmented aerodynamic control surface upon the malfunction of either its avionic control channel or its power actuator output.

Thyristorised Power Controllers

Abstract: A treatment of the principles of power electronics, this text covers the high-power circuits associated with thyristorised power controllers and the low-power electronic control circuitry vital to the operation of a practical system. A special feature of the book is its detailed presentation of gating and control circuits associated with each type of converter.

Stowable large area solar power module

Abstract: A large area solar photovoltaic power module (30) comprises a plurality of flexible large area solar panels (32, 34, 36, 38) interconnected by a flexible hinge (42). The module may thus be folded and subsequently rolled into a compact, stowable cylindrical configuration.

Semiconductor power module with integrated heat pipe

Abstract: A semiconductor power module includes a metallized ceramic carrier plate having an opening formed therein, a semiconductor power component with a base area of a given size adjacent the ceramic plate at the opening, a heat pipe integrated in the semiconductor power module having a vapor space, a condensation zone and a heating zone for distributing heat removed from the semiconductor power component at the heating zone over an area of the condensation zone being larger than the given area, a highly heat-conducting ceramic base plate having two metallized sides, and a frame vacuum-tightly interconnecting the carrier plate and the base plate forming the vapor space of the heat pipe therebetween.

Power electronics, control of the electromechanical energy conversion process and some applications

Abstract: Some fundamental considerations regarding power electronics and machine electronics are discussed. The historical development of ideas in this field is examined, the applications in the field of electric traction for rail vehicles are summarised and possible future developments are outlined. A systematic approach to power electronics, based upon the control of energy flow in switching convertors, is presented. This approach takes into consideration the different possible switching functions, the modulation functions, the realisation of these switching and modulation functions, the realisation of these switching and modulation functions by practical power semiconductor switches and the different classes of forced turn-off and commutation in power electronic circuits. Subsequently the concepts of topology and structure are defined, leading to different generic topologies for singular convertors. The structure of the five different families of composite convertors are examined, and practical examples are given. The systematic approach to machine electronics presented in the paper is based on a power flow model, using the unifying concept of rotating field theory. In combination with previously defined systematics for power electronics, this enables a systematic approach to the different classes of variable speed drives, based on power flow considerations. The historical developments of some power electronic and machine electronic ideas are traced, starting at the beginning of this century. Since the introduction of power semiconductor switches, applications of the older ideas have increased exponentially in all fields, making it impossible to cover all of them. As a consequence the development of power electronics and control of machines by electronic convertors in the field of electric traction is discussed in some detail, because this represents a record of important engineering achievements in this field. In conclusion, the present state and future trends of power and machine electronics are examined. This evaluation covers the development in the field of switching devices regarding the improvement of interfacing between signal and power electronics, the decrease of switching transition times, the reduction of device losses during conduction, and device developments for decreasing energy storage devices in convertors. The development of power electronic convertors for the reduction of the number of components in the topology and the development of convertors with a high frequency link are then covered, related to the expected development of switching devices. New directions of development regarding the electronic conditioning of the electromechanical energy conversion process concerning the elimination of undesirable effects and losses are important. The implementation of these trends by utilising the improved switching characteristics of power electronic switches and the information processing capability of microprocessors is discussed. This is then extended toward control aspects, where both these characteristics enable solutions not possible hitherto. Field control of AC machines imparts control characteristics equal to, or better than, those obtainable with DC machines to the systems, while the processing capability of microprocessors allows the configuration of adaptive machine electronic systems. Finally attention is given to the interfacing of power electronic and machine electronic systems to the power supply network. If the exponential growth of the installed capacity of equipment in the future is to be handled, active compensation of the distorted currents drawn from the supply by this equipment will have to be considered seriously.

Multi-driver integrated circuit

Abstract: A monolithic integrated circuit (IC) chip in which is formed a multi-driver power circuit, with each driver circuit including one output power transistor, is partitioned such that the power transistor of each driver circuit, formed in the IC, is spaced apart from those of any other driver circuit a distance sufficiently large to ensure the generation of a temperature differential between the power transistors of the different driver circuits when their power dissipation is different. A thermal sensor is formed in close proximity to each output power transistor, and as far away as possible from the other power transistors of the IC, whereby each thermal sensor is thermally, tightly, coupled to its associated power transistor. Each thermal sensor is electrically coupled to the base of its associated power transistor for controlling the conductivity of its associated power transistor when the power dissipation of its associated power transistor and its resulting temperature exceeds a predetermined level.

Apparatus for power measuring and calculating Fourier components of power line parameters

Abstract: Self contained radio transmitting state estimator modules are mounted on power conductors on both sides of power transformers in electrical substations and on power conductors at various places along electrical transmission lines. They are electrically isolated from ground and all other conductors. These modules are capable of measuring current, voltage, frequency and power factor (or the fourier components thereof) the temperature of the conductor, and the temperature of the ambient air. The modules transmit these parameters to local receivers. The receivers are connected by an appropriate data transmission link, to a power control center which allows determination of the state of the power system. The module measures the Fourier components of voltage and current over a number of cycles and transmits the components to the local receiver.

A Three-Phase Off-Line Switching Power Supply with Unity Power Factor and Low TIF

Abstract: A new three-phase off-line switching AC/DC converter is described, one which draws essentially sinusoidal AC currents from the input line and therefore generates a very low TIF (Telephone Influence Factor) in the three-phase line currents. The converter consists of three two-stage power processors, the first stage of each performing the unity power factor conversion and the second stage providing isolation and combining the power to a single DC output. The converter easily can be reconfigured to operate from either a single-phase or three-phase (wye or delta) input line. In addition to providing the benefits of unity power factor operation (i.e., good power utilization of source volt-ampere capacity, negligible harmonic currents and low TIF), the converter can operate from a wide range of input voltages because it minimizes voltage stresses to which power switches are exposed. The power stages and control circuits used in a 2 KW implementation of the converter are described and modeled. Some measurements demonstrating the operation of the converter are presented.

The Declining Drain Line Lengths Circuit--A Computer Derived Design Concept Applied to a 2 26.5-GHz Distributed Amplifier

Abstract: The principle of the "declining drain line lengths" has emerged as a successful concept in the pursuit of improved gain flatness and bandwidth. The optimized performance parameters of an "identical links" gain module are compared to those of a "declining drain line lengths" gain module, and the advantages of one design principle over the other are discussed. In addition, the paper studies the RF voltages and currents of the circuits' GaAs MESFETs and draws some qualitative conclusions as to the causes of gain limiting when approaching nonlinear operation. Finally, experimental results of a power module based on the "declining drain line lengths" principle are reported. The hybrid amplifier which incorporates five active devices with 0.25-µm gates achieves a small signal gain of G = 6.1+-0.6 dB from 2-27 GHz. Measurements of its output power, reflection coefficients and noise figure are afso discussed.

Transient free solid state automatic power factor correction

Abstract: In an apparatus for controlling the power factor of a power distribution system connected to inductive loads, banks of delta connected capacitors are added to or removed from the power lines of the power distribution system by a plurality of solid state switching devices which are under the control of a microprocessor. The solid state switching devices include optically isolated SCR devices that do not generate electrical interference and provide transient free operation. The microprocessor is also capable of calculating the power factor and displaying it on a digital readout.

Isolated power supply system and method

Abstract: In an embodiment for supplying power to sensitive telecommunications modules in an environment rich in radiated RF emissions, the AC power line is connected to a battery charger which is alternately connected to two rechargeable batteries. A third battery is connected in power transfer relation to the telecommunications modules and to a power control module, and in turn receives power from the one of the first and second batteries which is not being charged, such active battery being completely isolated from the AC power line. The third battery insures against transients and switching noise during switchover between the first and second batteries, and the power control module monitors the supply of power via an optoelectronic isolator and connects both the first and second batteries in parallel with the third battery in the event of a power failure.

Modeling and control challenges in power electronics

Abstract: The paper reviews some of the typical features and problems associated with modeling and control of power electronic circuits, and highlights various questions in power electronics that may be usefully examined from the viewpoint of control theory.

Power supply control device for automotive electronic control system

Abstract: A power supply control device is provided which supplies electric power to an automobile electronic control system, including a microcomputer, which controls devices on an automobile, such as a gear transmission, a clutch, etc. A power supply for the electronic control system is connected to a self-holding device for continuously supplying electric power to the electronic control system even if a key switch is turned off in error, resulting in a power cutoff. When the power is cut off inadvertently or intentionally, the electronic control system detects such a power cutoff, and effects a predetermined control operation. Upon completion of the operation, the electronic control system turns off the self-holding device to cut off the electric power supplied to the electronic control system.

Semiconductor power module comprising a ceramic substrate

Abstract: The invention relates to a power semiconductor module having a large-area ceramic substrate as a bottom surface. In such modules, the ceramic plate runs hollow during production so that after screwing insists on a heat sink is not a good thermal contact. With the invention it is proposed to insert into the module supports (10) so supports the ceramic substrate (1) relative to the housing (11), that the ceramic substrate (1) is flat or slightly convex at desired locations. By suitable choice of the material coefficient of expansion and a corresponding dimensioning of the pillars (10) it is achieved that the desired result is established without any special installation tools.

A Microwaver Powered, Long Duration, High Altitude Platform

Abstract: A complete microwave power transmission system for a long-endurance, high-altitude (60,000 ft.) airship is described. The system includes an electronically steerable, active phased-array consisting of thousands of identical radiating modules to beam the power, and a light weight, thin-film rectenna mounted on the underside of the airship to absorb and rectifying the incoming microwave power. Application to an airplane is also discussed.

Super-High Reliability Fault-Tolerant System NURECS-3000

Abstract: A highly reliable and fault-tolerant system called the NURECS-3000 has been developed.

Power interface circuit with control chip powered from power chip

Abstract: A power interface circuit includes a low voltage control chip and a separate, high voltage power chip contained in a common package. The high voltage power chip includes a power switching semiconductor device, such as a thyristor or power MOSFET, and is controlled under the influence of the control chip. Operating power for the low voltage control chip is provided from an auxiliary portion of the high voltage power chip. Such auxiliary portion comprises a voltage regulator, which derives its power from a high voltage lead in the power device. The high voltage lead may comprise a lead on which high voltage power is supplied for power switching purposes. The low voltage control chip may include a high degree of "intelligence", or logic functions, for controlling the power switching device, since the low voltage device may be a microprocessor or other device that can be fabricated with a high density of control elements.

Photovoltaic power systems—A user's guide to reliability in sizing and design

Abstract: The use of photovoltaic solar power for communication and signalling systems continues to grow although not without some growing pains. There have been successes but also failures. This paper examines those considerations most important in helping users avoid some of the common pitfalls in the sizing, selection, and installation of photovoltaic (PV) power systems.

Thermoelectric converter for SP-100 space reactor power system

Abstract: Conductively coupling the thermoelectric converter to the heat source and the radiator maximizes the utilization of the reactor and radiator temperatures and thereby minimizes the power system weight. This paper presents the design for the converter and the individual thermoelectric cells that are the building block modules for the converter. It also summarizes progress on the fabrication of initial cells and the results obtained from the preparation of a manufacturing plan. The design developed for the SP-100 system utilizes thermally conductive compliant pads that can absorb the displacement and distortion caused by the combinations of temperatures and thermal expansion coefficients. The converter and cell designs provided a 100 kWe system which met the system requirements. Initial cells were fabricated and tested.

Invited paper. Review of solid state power devices and circuits for HF electric process heating applications Part II: circuits†

Abstract: In Part II of this paper the different switch mode power supply topologies are reviewed as well as high frequency linear amplifiers. Frequency and power limitations are discussed with particular reference to the suitability for dielectric heating power sources.

Power Semiconductor Devices

Abstract: The converter valves used in solid state based on power electronic systems are designated power semiconductor devices. Here they will be abbreviated as power semiconductors. The most important power semiconductors are silicon diodes, thyristors, and power transistors [3.9, 3.15, 3.16, 3.26, 3.27].

Semiconductor module for power

Abstract: A semiconductor power module includes a plastic housing, a ceramic substrate with upper and lower surfaces being disposed in the housing, upper and lower metallizations respectively disposed on the upper and lower surfaces of the substrate, components disposed on the upper metallization, at least one support having upper and lower parts and being disposed on the substrate in the housing, a first elastomeric soft casting compound disposed in the housing covering the substrate and the lower part of the at least one support, the upper part of the at least one support protruding from the first casting compound, and a second thermo-setting hard casting compound covering the upper part of the at least one support and connecting the upper part to the housing.

Solar dynamic power for the Space Station

Abstract: This paper describes a computer code which provides a significant advance in the systems analysis capabilities of solar dynamic power modules. While the code can be used to advantage in the preliminary analysis of terrestrial solar dynamic modules its real value lies in the adaptions which make it particularly useful for the conceptualization of optimized power modules for space applications. In particular, as illustrated in the paper, the code can be used to establish optimum values of concentrator diameter, concentrator surface roughness, concentrator rim angle and receiver aperture corresponding to the main heat cycle options - Organic Rankine and Brayton - and for certain receiver design options. The code can also be used to establish system sizing margins to account for the loss of reflectivity in orbit or the seasonal variation of insolation. By the simulation of the interactions among the major components of a solar dynamic module and through simplified formulations of the major thermal-optic-thermodynamic interactions the code adds a powerful, efficient and economic analytical tool to the repertory of techniques available for the design of advanced space power systems.

Operation controller of motor

Abstract: PURPOSE:To accurately detect a load current and to simplify a circuit configuration by inserting a current detector between a DC power source and a power module, connecting the maximum value holder with the output side to discriminate an overload state. CONSTITUTION:In a circuit for controlling a motor 14 by a power module 13 made of switching elements 1-6 and circulating diodes 7-12 connected in a bridge, a current detecting resistor 15 for detecting a DC current Id is inserted between the module 13 and a DC power source. A detection voltage (v) generated at both terminals of the resistor 15 is input to the maximum value holder (capacitor C1) having arbitrary charging/discharging time constant. The maximum value is compared by a comparator 17 with the prescribed value, and when it exceeds the prescribed value, it is judged as an overload state to apply a signal to a control calculator 16 of the module 13, thereby reducing the rotating speed of the motor 14.

Circuit arrangement for power supply for electrical and electronic control or regulating devices

Abstract: A circuit arrangement having a purely capacitive power supply, at least one power consumer, and a control element for causing power to be supplied to the power consumer. The power supply, the power consumer and the control element form a series circuit. The power consumer has a relay activated by a switching transistor, the switching transistor is connected to the control element. The purely capacitive power supply has a series capacitor for defining the current flow in the series circuit. The circuit arrangement may have a plurality of power consumers connected in series with each other and in series with the power supply and the control element.