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Title: Method for exciting inductive-resistive loads with high and controllable direct current

Abstract

Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the amplitude of the dc voltage decreases, the widths of the rectangular wave generator output pulses decrease. Thus, the waveform synthesizer selectively changes the durations of the rectangular wave generator bipolar output pulses so as to produce a rectangular wave ac carrier that is duration modulated in accordance with and in direct proportion to the voltage amplitude from the synthesizer. Thereupon, by transferring the carrier to the load circuit through an amplifier and a rectifier, the load current also corresponds directly to the voltage amplitude from the synthesizer. To this end, the rectified wave at less than 100% duty factor, amounts to a doubled frequency direct voltage pulse train for applying a direct current to the load, while the current ripple is minimized by a high L/R in the load circuit. In one embodiment, a power transmitting power amplifier means having a dc power supply is matched to the load circuitmore » through a transformer for current magnification without sacrificing load current duration capability, while negative voltage and current feedback are provided in order to insure good output fidelity.« less

Inventors:
 [1]
  1. (Princeton Junction, NJ)
Issue Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
OSTI Identifier:
862558
Patent Number(s):
3959710
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS
DOE Contract Number:  
AT(11-1)-3073
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; exciting; inductive-resistive; loads; controllable; direct; current; apparatus; transmitting; dc; power; load; circuit; applying; voltage; standard; waveform; synthesizer; duration; modulate; bipolar; rectangular; wave; generator; amplitude; increases; widths; output; pulses; increase; decreases; decrease; selectively; changes; durations; produce; carrier; modulated; accordance; proportion; thereupon; transferring; amplifier; rectifier; corresponds; directly; rectified; 100; duty; factor; amounts; doubled; frequency; pulse; train; ripple; minimized; embodiment; means; supply; matched; transformer; magnification; sacrificing; capability; negative; feedback; provided; insure; fidelity; load circuit; negative voltage; power amplifier; generator output; rectangular wave; pulse train; voltage pulse; output pulses; dc power; output pulse; direct current; power supply; dc voltage; wave generator; load current; waveform synthesizer; resistive load; direct proportion; duty factor; /363/376/

Citation Formats

Hill, Jr., Homer M. Method for exciting inductive-resistive loads with high and controllable direct current. United States: N. p., 1976. Web.
Hill, Jr., Homer M. Method for exciting inductive-resistive loads with high and controllable direct current. United States.
Hill, Jr., Homer M. Thu . "Method for exciting inductive-resistive loads with high and controllable direct current". United States. https://www.osti.gov/servlets/purl/862558.
@article{osti_862558,
title = {Method for exciting inductive-resistive loads with high and controllable direct current},
author = {Hill, Jr., Homer M.},
abstractNote = {Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the amplitude of the dc voltage decreases, the widths of the rectangular wave generator output pulses decrease. Thus, the waveform synthesizer selectively changes the durations of the rectangular wave generator bipolar output pulses so as to produce a rectangular wave ac carrier that is duration modulated in accordance with and in direct proportion to the voltage amplitude from the synthesizer. Thereupon, by transferring the carrier to the load circuit through an amplifier and a rectifier, the load current also corresponds directly to the voltage amplitude from the synthesizer. To this end, the rectified wave at less than 100% duty factor, amounts to a doubled frequency direct voltage pulse train for applying a direct current to the load, while the current ripple is minimized by a high L/R in the load circuit. In one embodiment, a power transmitting power amplifier means having a dc power supply is matched to the load circuit through a transformer for current magnification without sacrificing load current duration capability, while negative voltage and current feedback are provided in order to insure good output fidelity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {1}
}

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