Pulsed power supply system for neutron well logging

Patent · Tue Dec 02 00:00:00 EST 1975

OSTI ID:7190560

Hopkinson, E C

A variable D. C. power supply and a variable A. C. power supply are coupled onto the upper end of a single conductor cable at the earth's surface and from the lower end of said cable to a well logging instrument. The A. C. voltage is used to provide filament power for the ion source accelerator tube. The D. C. voltage is used to provide power to fixed D. C. loads maintained constant by regulators once a threshold is reached. The D. C. voltage is raised above the threshold to control the pulsed acceleration voltage and hence neutron output by first feeding into a unijunction relaxation oscillator in combination with an SCR output which output is transformer coupled into a voltage multiplier circuit. An antilatch feature is provided for the SCR by transformer coupling the pulses on the SCR anode back to the base of a transistor in series with the cathode of the SCR. Two outputs of the voltage multiplier circuit are connected to the cathode and anode, respectively, of an ion source accelerator tube, the cathode being connected through a resistor to retard the ripple pulsing of the cathode to allow ionization of the accelerator tube.

• Assignee: Dresser Industries
• Patent Number(s): US 3924138
• Application Number: TRN: 76-014935
• OSTI ID: 7190560
• Resource Relation: Patent File Date: Filed date 30 Jun 1972
• Country of Publication: United States
• Language: English

Related Subjects

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RADIATION SOURCES
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