An Inductively Coupled Series Tube D. C. High Voltage Regulator

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Abstract
A new d. c. high voltage stabilizer, operating in the range from +5 to +50 kilovolts and for currents up to 50 milliamperes, is described. The stabilizer is of the usual degenerative type; but the series regulator tube, which is at high voltage, is inductively coupled to the feed-back amplifier at ground-potential. The signal from the amplifier amplitude-modulates an r-f oscillator, the output voltage of which is passed through a transformer, rectified, filtered, and applied as a d. c. correcting signal to the series tube grid. Insulation between high and low voltage circuits is provided in the r-f transformer. As an example of the short-term stabilizing action, a level of +35 kilovolts can be maintained to within 2 volts, for ±5 percent change in the input voltage, independently of load up to 50 milliamperes. The output ripple at this voltage and 20-milliamperes load is 0.05-volts r.m.s. Long-term stabilization, which depends chiefly upon constancy of the reference level, has not been measured, but means to its attainment are suggested.

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