Showing papers on "Power module published in 2001"

Dc to dc converter and power management system

Abstract: A DC to DC Converter includes an electrical circuit that allows batteries and other electrical energy storage devices to be charged from or to discharge to a variable voltage DC bus. This electrical circuit also enables seamless integration with other energy storage devices and/or DC power sources, such as fuel cells, to provide DC power for a Power Management System. A Power Management System preferably provides both full power source management and power conditioning. The Power Management System is able to manage power flow to and from multiple, isolated power sources and energy storage devices to deliver high quality alternating current (“AC”) power to a load.

Power Electronic Control in Electrical Systems

Abstract: Preface Electrical power systems - an overview Power systems engineering - fundamental concepts Transmission system compensation Power flows in compensation and control studies Power semiconductor devices and converter hardware issues Power electronic equipment Harmonic studies of power compensating plant Transient studies of FACTS and Custom Power equipment Examples, problems and exercises Appendix Bibliography Index

Capacitive components for power electronics

Abstract: As the consumer and industrial requirements for compact, high-power density electrical power systems grow substantially over the next decade, development of high power/energy density capacitor technology is a major enabling technology component element. For microsecond to fractional-second electrical energy storage, discharge, filtering, and power conditioning, capacitor technology is unequalled in flexibility and adaptability to meet a broad range of requirements in the future.

Flexible dv/dt and di/dt control method for insulated gate power switches

Abstract: Active gate control techniques are introduced in this paper for flexibly and independently controlling the dv/dt and di/dt of insulated gate power devices during hard-switching events. In the case of dv/dt control, the output voltage dv/dt can be controlled over a wide range by electronically adjusting the effective gate-to-drain (-collector) capacitance (i.e., Miller capacitance). For di/dt control, similar techniques are applied for electronically adjusting the output current di/dt over a wide range using voltage feedback from a small inductor connected in series with the switch's source (emitter) terminal. Both techniques are designed to maximize their compatibility with power module implementations that combine the power switch and its gate drive, including integrated circuit gate drives. Simulation and experimental results are included to verify the desirable performance characteristics of the presented dv/dt and di/dt control techniques.

Mobile power generation system

Abstract: A power generation system is described for supplying electrical power to a load (128) from at least one of a generator (108) and a battery (110). The power generation system includes a power bus (116) coupled to the generator and a bidirectional conversion unit (106) coupled between the power bus and the battery. The bidirectional conversion unit is capable of transitioning between a first direction wherein electrical power flows from the power bus to the battery and a second direction wherein electrical power flows from the battery to the power bus.

Power supply system, fuel pack constituting the system, and device driven by power generator and power supply system

Abstract: There is provided a power supply system which can cause a predetermined device to stably and excellently operate by only directly connecting an electrode terminal to the device, suppress waste of a power generation fuel, and achieve effective use of an energy resource.

Power semiconductor switching devices, power converters, integrated circuit assemblies, integrated circuitry, power current switching methods, methods of forming a power semiconductor switching device, power conversion methods, power semiconductor switching device packaging methods, and methods of forming a power transistor

Abstract: Power semiconductor switching devices, power converters, integrated circuit assemblies, integrated circuitry, power current switching methods, methods of forming a power semiconductor switching device, power conversion methods, power semiconductor switching device packaging methods, and methods of forming a power transistor are described. One exemplary aspect provides a power semiconductor device including a semiconductive substrate having a surface; and a power transistor having a planar configuration and comprising a plurality of electrically coupled sources and a plurality of electrically coupled drains formed using the semiconductive substrate and adjacent the surface.

The analysis of conduction and switching losses in multi-level inverter system

Abstract: The multi-level inverter system is very promising in AC drives, when both reduced harmonic content and high power are required. But, as the output voltage level increase, the number of using the semiconductor device is increased. In case of multi-level inverter system, the loss of semiconductor devices cannot be analyzed by conventional methods. The reason is that the loss of each the semiconductor device is different from one another unlike 2-level and the diode clamped inverter system needs extra clamping diode. In this paper, a simple and accurate method of computing conduction and switching loss is proposed for multi-level inverter system. The validity of the proposed method is proven for 3-level and 4-level diode clamped inverter system.

The universal power electronics based distribution transformer, an unified approach

Abstract: A high frequency switched, power electronics based distribution transformer is introduced and described. Besides the definition of appropriate voltage and power ratings also several preferred topologies are discussed, favorable to replace the typical power frequency distribution transformer by a high frequency switched one with low number of variants. Special attention is paid to modularity and automated production capability of all individual components, very low first and operating costs e.g. low maintenance costs, long operation intervals and high efficiency especially at partial load.

SiC devices for advanced power and high-temperature applications

Abstract: Silicon carbide (SiC) process technology has made rapid progress, resulting in the realization of very promising electronic devices and sensors, enabling advanced solutions in power industry and mobile systems. In particular, for electronics working under harsh environmental conditions, SiC devices reach unprecedented performance. Transfer to production has already started for some applications.

Power module package having insulator type heat sink attached to rear surface of lead frame and manufacturing method thereof

Abstract: A power module package in which a heat sink made of an insulating material is attached directly to a second surface of a lead frame, on which a down set is provided, and exposed to the outside, and a manufacturing method thereof are provided. A general rectangular plate or pre-bent plate may be used as the heat sink. The heat sink may be attached during a sealing process or through a separate process performed after the sealing process. The power module package has an improved heat radiation characteristic.

Variable power control for process control instruments

Abstract: A process control instrument includes a sensor/actuator portion and a transmitter portion connected to the sensor/actuator portion. The transmitter portion is operable to communicate with other process variable transmitters through a communication network. The transmitter includes a processing module and a power module operable to generate a power output supplied to at least the transmitter portion, wherein the power module is operable to adjust the power output based on a power control signal. Moreover, the power control signal may be generated by a controller device remote from the process control instrument and communicated to the process control instrument over the communication network. Additionally, the power module includes a power control module for adjusting the power output. This power control module includes an amplitude limiter operable to limit a power input to the process control instrument according to a controllable amplitude limit, and a power rate of change unit operable to limit a rate of change of the power input to the process control instrument according to a controllable adjustment rate limit.

System for detecting defective battery packs

Abstract: An electrical cabinet for an uninterruptible power supply (UPS) system includes universal slots that can receive power modules, battery packs, or chargers. The back plane of the slot has connector terminals for battery packs and power modules. The cabinet can be easily reconfigured as desired by changing the number of power modules chargers or battery packs installed. Circuitry is provided that indicates the capacity and operational readiness of the cabinet. This circuitry monitors the battery packs in each slot, and isolates any detected fault to a particular battery pack.

Voltage conditioner with embedded battery backup

Abstract: A power module for a CNI avionics system includes a rechargeable back-up battery ( 17 ) and a battery charger ( 9 ) in a back-up battery channel, a power conversion unit ( 11, 25, 27 and 29 ) in a power conditioning channel, and a semiconductor switch ( 23 ) for selectively coupling either the output of the power conditioning channel unit or the back-up battery channel through to the module output ( 24 ) and the electronics of external LRM's of the cryptographic section of the CNI avionics system, and a microcontroller ( 14 ) for controlling voltages and spurious signal emanations. Sensors ( 51, 52, 54 & 55 ) provide information to the microcontroller. The microcontroller senses the state of prime power, current draw on the cryptographic devices and adjusts power output between the battery and power supply in real time.

Power system stabilization system and method employing a rechargeable battery system

Abstract: A power system stabilization system is provided between power generation equipment significantly fluctuating in output and a power system required to maintain a predetermined voltage. In the power system stabilization system, a voltage detection device and a current detection device detect voltage and current, respectively, of the power system and voltage and current thus detected are used to calculate a level of active power required and that of reactive power required which are referred to to provide charging and discharging from a rechargeable battery to the power system via an A-D converter.

Method and apparatus for coordinating uninterruptible power supply modules to provide scalable, redundant power

Abstract: Presented is a modular uninterruptible power supply system utilizing common power modules, and providing redundant coordinated control thereof. The system provides identical control logic within each of the power modules. A virtual master is established through an arbitration scheme at initialization of the UPS system. The master then assigns a virtual vice master to provide the redundant control should the virtual master no longer be able to perform its functions. Nearly simultaneous control of operational mode and state change functions is accomplished through a coordinated communications system including a high-speed communications bus and digital control logic lines. Also provided is a mechanism for removal of the virtual master from its duties upon the detection of a problem that is not detected by the virtual master itself.

Apparatus and method for the measurement and monitoring of electrical power generation and transmission

Abstract: An apparatus and method in accordance with the present invention allows for a determination of the amount and direction of electric power being produced by a particular high voltage electric power transmission line. The present invention consists of a monitoring device (10) consists of a weatherproof housing (12) containing the electric potential and magentic field measurement components and a second weatherproof housing (14) containing the necessary processing and communications somponents, including a power supply and data transmission equipment.

Apparatus for providing supplemental power to an electrical system and related methods

Abstract: An apparatus and method for providing supplementary power to an electrical system of a vehicle or other machinery is provided. The apparatus and methods specifically provide a rapid-delivery of high amounts of power. The significant power levels are sufficient, for example, to turn the starter of a heavy-duty commercial transport vehicle stranded by a disabled battery. The power is supplied by a power source having the combination of high-density capacitor and battery. The power delivery is controlled to avoid such standard problems as reverse or same polarity connections and overvoltage. Control is effected by a combination voltage sensing circuit and isolation circuit to prevent current between the power source and the electrical system unless prescribed conditions are satisfied. The energy level of the power source is sustained by the capacitor-battery combination along with the capabilities to receive return charging from the electrical system as well as from alternating current and direct current sources.

Distributed internal fault bypass in a modular uninterruptible power supply

Abstract: A modular uninterruptible power supply is presented having multiple power modules. Each power module contains an internal bypass circuit sized for its particular power module, and preferably to carry two per unit load. The system also includes internal control circuitry for each power module that control transitions between the inverter and bypass modes of operation. Both the high speed communication bus and a high level interrupt line are utilized to minimize the transfer break time between different modes of operation while ensuring that the inverter is never paralleled with the utility line voltage. To further minimize this transfer time, a solid state switching circuit is utilized to provide the initialization between operational modes. To maximize the efficiency during the bypass mode of operation, and electromechanical relay is utilized in coordinated operation with the solid state switching device to provide long-term power requirements during the bypass mode.

High power DC-to-DC converter for supercapacitors

Abstract: The purpose of this paper is to present Solectria's approach to the design and realization of a high power, nonisolated DC-to-DC power converter for supercapacitors. The study focuses on supercapacitor specific design rules and on how to integrate the unit into a system with other energy storage devices and converters. Two applications are presented to illustrate the validity of the suggested approach: an electric vehicle with supercapacitor load leveling, and a 50 kW pulsed power source.

Universal adapter with interchangeable plugs

Abstract: A universal adapter for use with a rechargeable handheld communication device includes a power module. An AC rectifier is operable to convert an AC power signal into a rectified AC power signal. A DC transformer is operable to receive the AC rectified power signal and output a DC transformed power signal. A top switch feedback circuit is coupled to the DC transformer and is operable to regulate the DC transformed power signal. A DC to DC switching converter is coupled to the DC transformer and is operable to convert the DC transformed power signal to a converted DC power signal. A feedback control circuit is coupled to the DC to DC converter and operable to regulate the converted DC signal.

Power supply apparatus

Abstract: The power supply apparatus has a plurality of power modules, a holder-case housing a parallel arrangement of power modules in a plurality of rows and columns, and a fan. The interior of the holder-case is divided into a plurality of partitions by walls. Wall surfaces follow the contours of power module surfaces to establish cooling ducts of uniform width. The holder-case has flow inlets opened through the first surface plate and exhaust outlets opened through the second surface plate. The power supply apparatus uses the fan to divide and induce air flow through flow inlets into a plurality of partitions, and expels air which has passed through cooling ducts out the exhaust outlets thereby cooling power modules disposed inside the partitions.

Method for operating a wind power station and wind power station

Abstract: The invention relates to a method for operating a wind power station comprising a generator for delivering electrical power to an electrical network (1) to which the wind power station is connected. The invention also relates to a wind power station comprising a rotor and an electrical generator that is coupled to said rotor, for delivering electrical power to an electrical consumer, especially an electrical network. The method is characterised in that the power delivered to the network by the generator is regulated or adjusted according to the network frequency of said electrical network.

Trailer mounted mobile power system

Abstract: A trailer mounted mobile power generation system provides electrical power at locations where it is needed, either separate from or as a supplement to power from an electrical power distribution grid. A jet engine, a free turbine and an electrical power generator in a single common road transportable trailer. The trailer complies with weight and height limitations imposed by transportation authorities. The jet engine drives the turbine, which in turn drives the electrical power generator. Power levels on the order of 20 megawatts are generated while maintaining noise and combustion product emission levels within presently specified regulatory limits.

Apparatus and method for projecting a 3d image

Abstract: A laser projector for projecting a 3-D image onto an object. The laser projector has an optics module, a controller module, a power module, and a timing module. The timing module coupled with the optics module measures the distance between the laser projector and the object.

Apparatus and method for providing a power line communication device for safe transmission of high-frequency, high-bandwidth signals over existing power distribution lines

Abstract: The fiber optic isolator of the present invention transports data signals between high voltage power lines and a communications interface device, bypassing a step down transformer to low voltage power. The communication interface device includes a low voltage power line as well as telecommunications and wireless interfaces. The signals are coupled and de-coupled off of a high voltage power line by a power line coupler. The fiber optic isolator gets the signals (in light form) and transports them to and from the communications interface device. This insulates the system from current flow between the high voltage power lines and the communications interface.

Ac/dc chopper for power tool

Abstract: A dual-mode system for inexpensively operating electrically powered double-insulated devices (12), such as hand-held power tools and appliances. The system includes a cordless battery power module (14) that supplies the power and current demands of the device (12) in a cordless mode or a line power module (16) that supplies the necessary power and current demands in a physical envelope commensurate in size and interchangeable with that of the battery power module (14). The line power module (16) includes a chopper module (21) that is provided with a non-filtered high efficiency converter circuit that allows the chopper module (21) to generate the power and current required by the driven device (12). The inductance (22) of the motor (11) for the driven device (12) is used to filter the output of the chopper module (21). Eliminating the output filter from the chopper module (21) significantly reduces the cost and size of the line power module (16). Additionally, the need for multiple battery packs and fast rechargers is minimized by the availability of a low-cost converter. The line power module (16) includes an EMI filter (15) for filtering AC or DC input power. The chopper module (21) chops the filtered voltage, providing a series of voltage pulses having a DC voltage level that is suitable for driving the motor (11).

Low cost power semiconductor module without substrate

Abstract: A power module for low voltage applications, which does not include an insulated metal substrate is disclosed The module includes a power shell and a plurality of lead frames each lead frame including a conductive pad on which one or more MOSFETs may be electrically mounted The MOSFETs are electrically connected via wire bonds

Self-regulated cooling system for switching power supplies using parasitic effects of switching

Abstract: A self-regulated system and method for cooling switching power supplies that take parasitic effects of switching which would normally be dissipated as heat in a typical RC snubber circuit, and use that waste energy to power a cooling element to automatically cool semiconductor switches of the power supplies and any DC or AC systems. The cooling element can be a variable speed fan, a liquid pump, a Peltier device, or the like, in which case the system and method provide power to the cooling element in proportion to the amount of current delivered to the power supply, and so the cooling system automatically adjusts itself to the level needed to protect the power supply.

A microturbine based power generation system and method

Abstract: A power electrical system (37) is disclosed to connect a microturbine (12) and an electrical machine (14) to electrical power sources (18, 44) and a load (16). The invention permits the microturbine to be started using an external DC power source (18) and/or an external AC power source (44). DC power is converted to AC power by means of a buck-boost chopper (30), DC bus (24) and a DC-to-AC converter (42). AC power, from the AC power source, is converted to frequencies and voltages suitable to start a microturbine by a pair of DC-to-AC converters (42, 46) and the DC bus (24). The frequency and voltage levels of the AC power are gradually increased to accelerate the microturbine to startup speed. Once the microturbine is started, the external power sources are disconnected, and the DC bus and the DC-to-AC converters produce output AC power at a voltage level and frequency to match an electrical load.