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Title: High voltage pulse generator

Abstract

An improved high-voltage pulse generator has been provided which is especially useful in ultrasonic testing of rock core samples. An N number of capacitors are charged in parallel to V volts and at the proper instance are coupled in series to produce a high-voltage pulse of N times V volts. Rapid switching of the capacitors from the paralleled charging configuration to the series discharging configuration is accomplished by using silicon-controlled rectifiers which are chain self-triggered following the initial triggering of a first one of the rectifiers connected between the first and second of the plurality of charging capacitors. A timing and triggering circuit is provided to properly synchronize triggering pulses to the first SCR at a time when the charging voltage is not being applied to the parallel-connected charging capacitors. Alternate circuits are provided for controlling the application of the charging voltage from a charging circuit to be applied to the parallel capacitors which provides a selection of at least two different intervals in which the charging voltage is turned "off" to allow the SCR's connecting the capacitors in series to turn "off" before recharging begins. The high-voltage pulse-generating circuit including the N capacitors and corresponding SCR's which connect themore » capacitors in series when triggered "on" further includes diodes and series-connected inductors between the parallel-connected charging capacitors which allow sufficiently fast charging of the capacitors for a high pulse repetition rate and yet allow considerable control of the decay time of the high-voltage pulses from the pulse-generating circuit.« less

Inventors:
 [1]
  1. Morgantown, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
862784
Patent Number(s):
4011463
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03K - PULSE TECHNIQUE
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
voltage; pulse; generator; improved; high-voltage; provided; especially; useful; ultrasonic; testing; rock; core; samples; capacitors; charged; parallel; volts; proper; instance; coupled; series; produce; times; rapid; switching; paralleled; charging; configuration; discharging; accomplished; silicon-controlled; rectifiers; chain; self-triggered; following; initial; triggering; connected; plurality; timing; circuit; properly; synchronize; pulses; time; applied; parallel-connected; alternate; circuits; controlling; application; provides; selection; intervals; allow; connecting; recharging; begins; pulse-generating; including; corresponding; connect; triggered; diodes; series-connected; inductors; sufficiently; fast; repetition; rate; considerable; control; decay; circuit including; charging circuit; charging voltage; pulse repetition; voltage pulse; voltage pulses; repetition rate; especially useful; pulse generator; core sample; ultrasonic testing; triggering pulse; rock core; generating circuit; decay time; triggering circuit; high-voltage pulse; charging capacitor; allow sufficient; core samples; /307/

Citation Formats

Fasching, George E. High voltage pulse generator. United States: N. p., 1977. Web.
Fasching, George E. High voltage pulse generator. United States.
Fasching, George E. Tue . "High voltage pulse generator". United States. https://www.osti.gov/servlets/purl/862784.
@article{osti_862784,
title = {High voltage pulse generator},
author = {Fasching, George E},
abstractNote = {An improved high-voltage pulse generator has been provided which is especially useful in ultrasonic testing of rock core samples. An N number of capacitors are charged in parallel to V volts and at the proper instance are coupled in series to produce a high-voltage pulse of N times V volts. Rapid switching of the capacitors from the paralleled charging configuration to the series discharging configuration is accomplished by using silicon-controlled rectifiers which are chain self-triggered following the initial triggering of a first one of the rectifiers connected between the first and second of the plurality of charging capacitors. A timing and triggering circuit is provided to properly synchronize triggering pulses to the first SCR at a time when the charging voltage is not being applied to the parallel-connected charging capacitors. Alternate circuits are provided for controlling the application of the charging voltage from a charging circuit to be applied to the parallel capacitors which provides a selection of at least two different intervals in which the charging voltage is turned "off" to allow the SCR's connecting the capacitors in series to turn "off" before recharging begins. The high-voltage pulse-generating circuit including the N capacitors and corresponding SCR's which connect the capacitors in series when triggered "on" further includes diodes and series-connected inductors between the parallel-connected charging capacitors which allow sufficiently fast charging of the capacitors for a high pulse repetition rate and yet allow considerable control of the decay time of the high-voltage pulses from the pulse-generating circuit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {3}
}

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