Showing papers on "Power module published in 1972"

Multiple output alternator

Abstract: A multiple output alternator having separate sets of power coils mounted on the stator adapted to be magnetically excited by a rotor having a direct current field coil is provided for a vehicle. The separate power coils being in a cooperative relation to give a distributed load condition when the rotor is driven by the variable speed power unit of the vehicle. Rectifying and voltage regulating means are provided for both sets of power coils to provide a high and low wattage power source, with the field coil of the rotor being supplied with a regulated D.C. voltage from the high wattage power source which also supplies power to the conventional electrical system of the automotive vehicle. For example, two power sources from an alternator are adapted to be used for charging batteries in a power system having two storage batteries which supply power to circuits requiring differing voltages, a relatively low voltage circuit which may include the high wattage power source and one of the batteries and a relatively high voltage circuit which is supplied by both storage batteries in series connection for special purposes such as starting of the variable speed power unit. More than two outputs could be supplied if desired.

Power module for driving vehicle-propelling element,including stationary axle means mounting said element

Abstract: A completely self-contained power module for supplying rotational power to drive wheels, tractor tracks, airplane propellers, and the like, of miniature toy vehicles, the module including in a single housing a rechargeable battery, an electric motor with a drive shaft, switch means for electrically connecting the battery to the motor, a non-rotating axle integrally a part of the module''s housing and disposed at a fixed relationship to the motor''s drive shaft for rotatably carrying the driven wheels, etc., and a means for providing recharging current to the battery, preferably including means for disconnecting the motor from the battery circuit during charging.

Regulated dc-dc power supply

Abstract: An improved direct-current power supply is provided for converting alternating-current power or direct-current power into direct-current power, and which has particular utility in energizing electronic equipment such as computers, data processors, and the like. The power supply of the invention is a regulated fly-back type in which electric energy from an appropriate source is alternately stored in an electromagnetic device, such as a transformer, and then released into a load. The improved power supply of the invention includes control circuitry which causes a constant amount of energy to be stored during each cycle independently of source voltage, and which enables the power supply to exhibit highly favorable regulation characteristics through a wide range of loads.

Detachable power module for flying toy aircraft

Abstract: A completely self-contained detachable power module for removable attachment to a vehicle body, such as a flying toy aircraft fuselage, the module including a housing containing a rechargeable battery arrangement and a powerful miniature electric motor coupled through a drive arrangement to a driven element, such as a propeller, the housing also including attachment means for removably attaching the housing to a toy vehicle body.

Controlling Generator MVAR Loadings Using a Static Optimization Technique

Abstract: The utilization of EHV networks and underground cables in today's modern power system has created a reactive power control problem. In particular, system generators are being forced to absorb large quantities of reactive power to maintain system voltage.

765-kV Power Line Carrier Communications I-Theoretical Considerations

Abstract: The decision to use power line carrier as the communications medium for protection of the American Electric Power (AEP) System is related to the general development and success of its use here and abroad. AEP has successfully used power line carrier almost exclusively for these functions on lines of all system voltages since its conception. Factors, both limiting and advantageous are discussed as related to the decision to continue its use for 765-kV protection.

Transistor power converter

Abstract: A transistor power converter is described which may be used to convert a given direct current voltage to a higher direct current voltage. Transistor oscillator circuits are explained and illustrated which accomplish the desired power conversion. These circuits have certain advantages including low cost, small size, high efficiency, and low standby power requirements, that is, power is consumed by these power converters only when required by the electrical loads. Some of these circuits may be manufactured with as few as four electrical components. Specific examples of workable circuits are given.

Power supply for electronic circuits at high-voltage potential

Abstract: A power supply apparatus supplies power from a low-voltage potential to an electronic circuit at a high-voltage potential such as an electronic circuit for detecting the current in high-voltage conductors and the like. The electronic circuit is connected to an associated transformer for receiving electric energy. The apparatus includes a power oscillator connected to the low-voltage potential which in turn has an output transformer. A current path is provided for conducting electric power from the output transformer of the oscillator at low-voltage potential to the associated transformer connected to the electronic circuit at high-voltage potential. A power source means supplies electric power to the power oscillator independently of the value of the electrical energy at the high-voltage potential.

Electrical Systems for Automatic Handling and Electric Heating of Slabs

Abstract: The availability of large quantities of electrical power and sophisticated means of control has justified the use of induction methods in heating large steel slabs to rolling mill temperatures. Capable of delivering 210 MW, a unique power system, comprising power transformers, autotransformers, static switches, and capacitor banks, provides eighteen induction heaters with controlled electrical energy. The entire system can deliver 600 ton/h of steel to the rolling mill. The basic overall automatic control scheme involves the operations of slab handling control, heater control, static power switching, and computer control. The control functions, including phase balance and demand limit control, are described and discussed. The features and operation of the static power switch, capable of switching close to 10 000 A, are presented. Used as a protective device, the switch can clear up to 210 000-A faults in less than one cycle.

Level-Detector Integrated Circuit

Abstract: In recent years, there has been increasing emphasis upon the utilization of integrated circuits (IC's) to perform many of the basic control functions in circuitry for power equipment. The advantages of this approach accrue from the economic considerations involved with using IC's in quantities and also the feasibility that a certain amount of standardization of circuitry may be obtained. The subject of this paper is a newly developed IC control module, the level detector, which is intended for use in telephone power systems equipment.

A Solid-State Asynchronous Static Switch

Abstract: A single-phase 5-kW 120-V demonstration model switching system which utilizes power transistors and does not require power source synchronization has been developed and laboratory evaluated. This model accomplishes load transfer between two independent power sources at any phase angle and in less than 20 µs. The utilization of this system in investigating the effects of asynchronous switching on a limited number of electronic equipment indicated that such equipment can tolerate high-speed power source asynchronous switching.

A Monolithic Power Driver for Complementary Power Transistors

Abstract: A Monolithic Power Driver has been designed to drive a pair of complementary output transistors. This prime function is as an audio amplifier for outputs up to 70 W rms. It features low standby current l4mA typical; high output current capability, 120 mA; low bias current; 1.5 uA typical; internal current limiting; external current and power limiting; adjustable quiescent current in the output transistors with temperature compensation; wide power bandwidth 100 kHz; wide power supply operating range, 10-50V and excellent linearity.

Power Reduction Techniques for LSI Memory

Abstract: Power reduction techniques are described for both LSI memory components and systems. These techniques have been verified experimentally for both read-only and random access read/write components using power switching circuits external to the chips. A number of ways to apply on-chip power switching are described. The power switching concept is also described for memory cards and systems that can be organized into blocks.

A low power, high stability, superconducting modulator

Abstract: A simply constructed high-stability superconducting modulator requiring a power of 3 mW and capable of detecting 5 pV is described.

Adaptive thyristor power, control circuits

Abstract: A solid-state circuit is described that provides electronically settable memory control (adaptive control) of thyristor power regulating devices. Electrical power delivered to ac loads, such as lighting, heating, or motors, can be smoothly varied or set to any value from zero to essentially full power by a manual, computer, or remote-controlled application of a voltage pulse to a circuit adapt terminal. Power settings of the circuit can be maintained indefinitely with or without applied power, yet they can be changed quickly (milliseconds) or slowly (dekaseconds) by the application of an appropriate adapt pulse. An adaptive ferroelectric transformer provides the analogue memory capabilities of the control circuit.

Maximum power transfer from a solar-cell array by sensing array temperature

Abstract: A technique is described in which a spacecraft solar-cell array is caused to operate at or near maximum power output over a wide range of environmental conditions. The output of an array temperature sensor is used to vary the duty cycle of a pulse-width-modulated impedance regulator so that the array operates at the voltage of maximum power. A resistance-type temperature sensor was found to be applicable for most spacecraft missions. However, a solar cell used as a temperature sensor has the advantage of negligible transient errors on lightweight arrays for orbiting spacecraft.

Solid state d.c. power controller design philosophies and their evaluation.

Abstract: Evaluation of remote power controllers (RPC), which has enhanced knowledge of the capabilities of various design philosophies and has indicated certain limitations that RPC's exhibit. Additionally, this activity has clearly emphasized that certain RPC design parameters merit further consideration in development. The major design parameters to be analyzed in more detail are the rates of change of the rise and fall times of the output current. The major reason why transient voltages and currents should be reduced is the minimization of the reverse collector-to-emitter voltage. The requirement for higher bus voltage coupled with the present problem of improving the efficiency of power control points out the urgent need for improvement and advancement of higher current, voltage, and gain power semiconductors.

Uninterrupted DC power supplies

Abstract: Primary power source dropouts can cause voltage transients or loss of conditioned power to critical or essential electric power-using equipment. Some of the power loads require controlled transient power, that is , conditioned power which at all times is contained within specified voltage regulation limits. Critical loads which can tolerate a temporary loss of power can be satisfied by the availability of a standby power source. Essential loads which require controlled transient power supply voltage must include in the system configuration of the uninterrupted power supply, an active energy storage element. There are three basic ways in which the controlled transient uninterrupted DC power supply can be configured. The special features of the three systems are compared and the most suitable application for each system is indicated. To illustrate the reduction to practice of one of the controlled transient uninterrupted power supply configurations, a 3KW uninterrupted DC power supply developed for the U. S. Army ECOM by TRW Systems is described indetail.