Showing papers on "Power module published in 1993"

A power supply and battery charging system

Abstract: A novel power charger apparatus (300) is provided for supplying electrical power to an electrical device (200) for operation or to a battery (402) for charging, or both. The charger apparatus (300) comprises a primary power supply (302) for supplying power from an external power source to the power charger (300), a power converter (306) coupled to the primary power supply (302) for converting the power received by the primary power supply (302) from the external power source into a form usable by the power charger (300), and a power controller (308) coupled to the power converter (306) for controlling the power applied to the device (200) or the battery (402), or both, whereby, regardless of the rate of charge of the battery (402), a constant current is maintained for charging the battery (402) while the voltage across the device (200) and battery (402), is allowed to vary. To observe the rate of charge of the battery (402), the power charger (300) also includes a charge rate sensor (404) connected to the battery (402) and coupled to the power controller (308) to measure the voltage across the battery (402).

High density interconnect multi-chip modules including embedded distributed power supply elements

Abstract: By employing High Density Interconnect (HDI) multi-chip modules (MCMs) having elements of a distributed power supply embedded in the MCM itself, the functions of an MCM and a power converter are combined. The embedded power supply elements include DC-DC or AC-DC converters to convert an input voltage and input current to a relatively lower output voltage and relatively higher output current, thereby decreasing the current requirements of external power supply lines connected to the multi-chip module. The current and voltage outputs may be connected to chip power inputs through relatively short, low-impedance power distribution conductors comprising copper strips direct bonded to a ceramic substrate; alternatively, or in combination with direct bonded copper conductors, the low-impedance power distribution conductors may be situated within an HDI overcoat structure. The power supply elements may be placed within cavities formed in the substrate, or on a thinner portion of the substrate. The power supply may also provide multiple output voltages.

A unified method for modeling semiconductor power devices

Abstract: A unified method for modeling semiconductor power devices has been developed. The novelty of the method is a generalized description of the lightly doped region which is a common feature of all power devices. The charge carrier distribution in this region is calculated with a fast numerical algorithm. Depending on this carrier distribution the voltage across the low doped zone is calculated with analytical equations. This so called hybrid-description can be adjusted to the physical behavior of all power devices. By combining the hybrid-model with an analytical description of the remaining high doped regions the complete power device is described. The method has been applied to the power diode, the power bipolar transistor, and the IGBT. The developed circuit models have been implemented in a commercial circuit-simulator. The simulation results have been compared with measurements. >

A W-band integrated power module using MMIC MESFET power amplifiers and varactor doublers

Abstract: A high-performance integrated power module using U-band MMIC MESFET power amplifiers in conjunction with W-band MMIC high efficiency varactor doublers has been developed for millimeter-wave system applications. The authors present the design, fabrication, and performance of this W-band integrated power module. Measurement results show an output power of 90 mW with an overall associated gain of 29.5 dB at 94 GHz. A saturated power of over 95 mW was also achieved. These results represent the highest reported power and gain at W-band using MESFET and varactor frequency-doubling technologies. This integrated power module is suitable for future 94-GHz missile seeker applications. >

Solid-State Power Conversion Handbook

Abstract: Transient Analysis, Circuit Analysis, and Waveforms. Semiconductors, Resistors, and Capacitors. Transformers, Inductors, and Conductors. Rectifiers and Filters. Phase Control Circuits. Transistor Inverters. Thyristor Inverters. Switching Regulators. dc-dc Converters. Resonant Mode Converters. Modulator and Control Analysis. Pulse-Forming Networks and Modulators. Protection and Safety. Electromagnetic Compatibility and Grounding. Semiconductor and Equipment Cooling. Reliability and Quality. Regulated Power Supplies. Uninterruptible Power Systems. Power Factor Correction. Glossary. Index.

Power supply for electronic device, and electronic device system

Abstract: To make it possible to supply to a battery a charging current having a sufficient capacity which enables a short-time charge while supplying a drive current for usual operation to a battery operable electronic device, without making construction large-sized and complicated. The present invention is intended to be able to delicately vary a charging current of a battery according to the variation of power consumption of load on an electronic device, by providing constant power feedback control means for performing feedback control of the output power so as to cause a constant power or a nearly constant power, based on a current feedback value and a voltage feedback value.

Compact power module with a heat spreader

Abstract: In a power module having at least one power device chip and circuits for driving and controlling the power device chip which are incorporated within one and the same package, a heat spreader which is constituted by a material having a heat dissipation property and supports the power device chip on its upper surface is inserted into an opening formed in a control substrate having an upper surface on which patterns for forming the chip driving and controlling circuits and a connection pattern for connection with the power device chip are printed, and the control substrate and the heat spreader inserted into the opening are fixedly supported on a base substrate. Thus, the power device chip and the control substrate can be disposed in plane and reduced in size.

Electric power distribution module for an electric power generation and distribution system

Abstract: This invention relates to an electric power generation and distribution system, and more particularly to an electric power distribution module for use in such systems, having an insulative support structure which includes integral therewith electrically conductive means which define a circuit for distributing electric power received from one or more power sources to one or more electrical loads, the insulative support structure also including integral therewith current sensing means for sensing a flow of electrical current in the electrically conductive means.

Systems and methods for managing energy of electric power supply systems

Abstract: An energy management system for optimizing low power and short term high power states of a power supply system. A significant feature of the present invention relates to a design of a power supply apparatus based on internal resistances of the power supply components. In an exemplary embodiment, the power supply supplies power for driving a load. The power supply includes a power source having a first internal resistance and includes a capacitor connected in parallel with the power supply and having a second internal resistance. The first internal resistance and the second internal resistance have a predetermined relationship.

Aircraft power unit with elective mechanical coupling

Abstract: An integrated aircraft power unit providing the electrical and other forms of energy needed during auxiliary power unit operating conditions-while the aircraft is on the ground, and also providing airborne or emergency power including high altitude flight emergency conditions power wherein the power unit uses an oxidant supply carried by the aircraft. In this high altitude operating condition the power unit provides lower electrical output, but lower losses and improved efficiency over previous power units. The disclosed power unit includes separate electromechanical transducers or motor generator devices coupled to a segregated pair of rotational shaft members, one for the inlet or compressor fan and one for the outlet or exhaust turbine fan with electrical coupling and then friction clutch coupling of these shafts accomplished for low altitude high energy output operation of the power unit. The described power unit is also capable of providing these aircraft energy needs with a minimum of physical changes from conventional integrated aircraft power units.

Pulsed power converter with multiple output voltages

Abstract: A distributed power system for providing multiple output voltages, including pulsed voltages, to a solid-state phased-array radar transmit/receive module, for example, includes: an energy-storage capacitor for coupling to an input dc power source and for storing substantial energy at high voltage for supplying pulsed voltages at low voltage; at least one capacitance-multiplying converter, including first and second transformers with multiple secondary windings, for producing positive and negative voltages on buses internal to a power module; and a plurality of series regulators to obtain multiple positive and negative load voltages, including pulsed voltages, from the positive and negative bus voltages. Substantial energy storage is achieved within the power module; and, if even more energy storage is desired, an additional external energy-storage capacitor can be coupled to the input power leads, thereby being coupled in parallel with the energy-storage capacitor. Only two power pins are needed to supply the entire module.

SP-100 nuclear electric propulsion for Mars cargo missions

Abstract: This paper summarizes an evaluation of mission performance (in terms of vehicle mass and trip time) of the use of the near-term SP-100 reactor technology for nuclear electric propulsion for Mars cargo missions, and of the technology requirements for the propulsion and dynamic power conversion systems of the vehicle. The reactor power system uses dynamic power conversion (Rankine), and the propulsion system uses lithium-propellant magnetoplasmadynamic (MPD) thrusters. Three reactor power modules are used to give a total 'bus' power of 1.7 MWe. The total power, power conditioning, and propulsion systems specific mass is 24.8 kg/kWe; the propellant tankage factor is 2.8 percent. The power conditioning system has an efficiency of 90.2 percent and the MPD thrusters an efficiency (electric-to-jet) of 60 percent at a nominal specific impulse of 5000 lb(f)-s/lb(m). Rankine, Brayton, and Stirling dynamic power conversion systems were compared, and the Rankine was found to give the best performance in terms of smallest specific mass and volume; however, it has the longest development time requirement.

Vehicle and vehicle parts transportation system

Abstract: A vehicle and vehicle parts transportation system used for moving, positioning and manipulating a vehicle and/or its parts primarily when a vehicle is damaged or in the need of repairs. The system consists of a power module (5) having interchangeable legs and parts that allow the power module (5) to be reconfigured as to its height, width and length and various tool modules. The power module includes a power means (50) with a tool support plate (22) mounted thereto. The power module (5) becomes a different tool as required or desired by the operator by simply mounting one of the various tool modules to the tool support plate (22). Each specific tool module provides the necessary lifting and motive force apparatus and means for maneuvering the tool module for performing the necessary operation.

Solid state microwave power amplifier module

Abstract: A solid state high power microwave amplifier module. The module incorporates a stacked assembly of integrated low temperature cofired ceramic substrates forming a monolithic structure containing all the microwave circuitry required to combine the output power of a large number of monolithic microwave integrated circuit power amplifier chips, a heatsink and a power supply. One substrate defines an input radial power divider circuit for dividing the input signal into input signals for each power amplifier chip. The second substrate includes the power amplifier chips and a radial combiner circuit. The output of the combiner to coupled to an output waveguide in the heatsink. The module is lightweight and small in size, and of high reliability since the number of wire bonds is greatly reduced since most of the microwave circuitry and connections can be formed as part of the integrated structure.

Semiconductor power module

Abstract: In a semiconductor power module, a surge voltage on a power source line of a semiconductor element for electric power control is restrained A power source terminal PS(NP) is comprised of power source terminals PS(P) and PS(N) which are arranged adjacent each other through a plate-like insulative sheet INS1 made of insulative synthetic resin or the like sandwitched therebetween The power source terminals PS(P) and PS(N) are each formed by a conductive plate and respectively transmit a positive and a negative power source potentials The thickness of the insulative sheet INS1 is 05 mm to 15 mm, for instance A reduction is made in a parasitic inductance which is present in the power source line which extends from the power source terminal PS(P) to the power source terminal PS(N) through the semiconductor element for electric power control, thereby suppressing a surge voltage which is developed between the power source terminal PS(P) and the power source terminal PS(N)

Noise resistant semiconductor power module

Abstract: In a circuit board having four-layered conductive pattern on which a control circuit is arranged, wiring sub-patterns 133a in the first layer are divided into four areas A1-A3 and A8, for respective sets of circuit parts having same power potentials. Respective sub-patterns belonging to the areas A1-A3 are partially or fully surrounded by wiring sub-patterns PEa1 PEa3 connected to negative power potentials of circuit parts belonging to respective areas, respectively. Similarly, at least part of a wiring patten Pa2 for transmitting an input signal to a semiconductor active element is surrounded by a wiring pattern PEa4. Penetration of electric noises to the wiring patterns for the control circuit, in particular to the wiring pattern for transmitting the input signal to semiconductor element, is decreased to thereby prevent misoperation due to electric noises.

A novel structure of multi-level high voltage source inverter

Abstract: This paper deals with a new multi-level high voltage source inverter with GTO thyristors. A multi-level approach seems to be best suited for implementing a high voltage conversion system because it leads to harmonic reduction and safely deals with a high power conversion system independent of the dynamic switching characteristics of each power semiconductor device. However, a conventional multi-level inverter has some problems; voltage unbalance between DC-link capacitors, and overvoltages across the inner switching devices. Therefore, the authors propose a novel structure of a multi-level inverter for improving these problems. They discuss the topology, operating modes and the PWM method. >

High power power supply

Abstract: The invention concerns a high power power supply with output power in excess of 5 kilowatts, by way of example, for the supply of electromagnets in the area of electromedicine and nuclear physics. In order to regulate the output current, power thyristors 28 are utilized within the two bridge rectifier circuits 2 and 3, operated with phase control regulation. In order to keep the output current constant, two transistor final control elements 10 and 11 regulated by a control-gain amplifier are used. Two charging capacitors 6 and 7 are provided for energy storage, the capacity of which is sufficiently large that the commutation of the power thyristors 28 transpires by means of self-extinguishing in a currentless state, whereby conducted as well as irradiated electrical interferences are eliminated.

Solid state frequency converter capable of misaligned parallel operation

Abstract: A ground power unit capable of no-break power transfer includes a rectifier for converting power from commercial mains to direct current, a switching circuit, a power transformer, and a pattern generator for controlling the operation of the switching circuit. Voltage and current sensors monitor whether the phase of the ground power unit is leading or lagging the phase of the aircraft power bus at the tinge of power transfer. The frequency and phase of the pattern generator converter is adjusted to bring the two systems into alignment quickly, well before the power transfer operation is completed. The ground power unit limits the power transfer between the two systems to prevent the overloading of either.

Asynchronous Generators For Fast, High-Energy Pulsed Discharge as Power Supplies for Electromagnetic

Abstract: Asynchronous (induction) generators for fast pulsed power applications have been already proposed due to their apparent simplicity of the rotating member which merges both the functions of the flywheel and the electromagnetic secondary. Also, an attractive feature is the operation of the machine as an induction motor dun'ng the energy storage period. However, no satisfactory selfexcitation schemes have been found so far. Excitation capacitors are much more voluminous than the generator itself. The Laithwaite-Kuznetsov solution, while ingenious, applies to steady-state operation and ferromagnetic structures. Also, ingenious, the Nalty solution requires a complex conditioning of feedback signals coming from the accelerator itself; leading to a very large machine. A new type of pulsed asynchronous generator producing itself the reactive power necessary for self-excitation-possible only in a short transient regime, time sufficient for powering an electromagnetic launcher is presented here. The gradual increase in amplitude during the pulse time followed by the collapse of the excitation and of the output voltages and currents permits the projectile to be under constant acceleration during the large part of the transit through the barrel and to e d the accelerator under zero current which represents almost an ideal cordrion for an electromagnetic launch.

Integrated technology and performance for multi-kilowatt power electronic converters-an evaluation

Abstract: This paper presents an overview of the current state of the technology for electromagnetic integration of high power electronic converters. Some of the materials technologies needed for manufacture are described. As an example a completely integrated experimental multi-kilowatt resonant DC-DC power converter is discussed, together with some problems encountered and their solution. Experimental results are also given. A possible extension of the technology to hard switched, but snubbed and clamped power converters is discussed. Some of the thermal problems together with a thermal analysis are addressed. Conclusions about the technology are drawn and possible future developments investigated. >

Low power module

Abstract: A timekeeping integrated circuit with devices partitioned into areas with different power supplies and level translators between the areas; the level translators use a memory cell for isolation and to shorten the signal active time for low power consumption. Also a one-wire communication port with low power input buffers may be used to detect very slowly varying voltages. The input buffers include staged decreasing resistors as a power dissipation limitation.

Power supply modulator circuit for transmitter

Abstract: The present invention relates to a power supply modulator for a radio transmitter having apportioned input impedance and buffered switching of power modules. A series arrangement of power supply modules, conventionally disposed in a diode cascade, includes individual inductors to apportion the input impedance of the switching power supplies. The switching sequence of the power supplies is controlled by a FIFO buffer, with the sequentially adjacent power supplies being disposed physically remote so that current transients and thermal loads are more uniformly distributed.

A new generation of intelligent power devices for motor drive applications

Abstract: A novel low-loss, high-speed series of intelligent IGBT (insulated-gate bipolar transistor) power modules has been developed. Power device performance has been enhanced through the use of third-generation IGBT chip technology with optimized gate drive and control circuits. Short-circuit protection using current-sense IGBTs with real-time current limiting allows power devices to be optimized for lowest operational losses. Further reduction of losses is achieved through the use of a new, ultrafast, soft-recovery, free wheel diode chip. New compact isolated base packages containing six or seven power devices with current ratings up to 200 A at 600 V, and 100 A at 1200 V are designed for cost-effective, high-performance motor control applications. The internal design philosophy and architecture of these devices are explained. >

Simplified power processing for inert gas ion thrusters

Abstract: Significant simplifications to power processors for inert gas ion thrusters in the 1 to 5 kW range have been identified. They include elimination of all but three power supplies - one each for the neutralizer, main discharge, and beam. The neutralizer and discharge power supplies would provide both cathode heating and plasma generating functions. This dual-use power supply concept was validated via integration tests with a 30 cm diameter xenon ion thruster. The beam/accelerator power supply would have positive and negative outputs to allow a single power supply to provide both functions. The discharge and beam power supplies would incorporate full-bridge inverters similar to those proven for flight-ready arcjet propulsion systems. Operation of this simplified power processing scheme at an inverter frequency of 50 kHz results in a projected power processor design with low mass and high efficiency. A 2 kW reference point design has estimated values of specific mass of 5.4 kg/kW and an efficiency of 93 percent.

Hospital bed power module

Abstract: A hospital bed electrical power module for powering external medical devices directly from the bed includes electrical isolation circuitry connected to prevent external device leakage current from traveling through the bed frame. The power module reduces the risk of shock to the patient due to the leakage current of the external device.

Performance optimization of quasi-direct converters

Abstract: The paper describes a three-phase to three-phase quasi-direct power converter, i.e. a forced commutated AC/DC/AC power converter with small energy storage devices in the DC link. Since energy storage minimization calls for instantaneous input/output power balance, a proper control strategy is needed. In the paper, an effective digital control of the line current waveforms capable to work with unbalanced line and/or load voltages and providing also high power factor, is presented. After a discussion of the general properties of quasi-direct power converters, design criteria of both power and control sections are given, and experimental results of a 2 kVa prototype are reported. >

Abnormality detector for brushless motor

Abstract: PURPOSE: To provide an abnormality detector for brushless motor which can detect abnormality of current sensor. CONSTITUTION: A winding 5 of Y-connection is connected through a current sensor 4 with the output of a power module 3 connected with a power supply 6. Output from the current sensor 4 is fed to an adder 8 in a failure detecting circuit 11 and the output from the adder 8 is compared by a comparator 9 with a predetermined voltage generated from a reference voltage detector 10. When the predetermined voltage is exceeded, a failure signal is delivered to a controller 7 which then interrupts a contactor 2 connected in series with a power supply 6. COPYRIGHT: (C)1994,JPO&Japio