The performance of physical voltage regulating devices
P J Higgs · Journal of Scientific Instruments · 1936
The object of the investigation was to regulate the voltage across the filament of a thermionic valve to 0.1 per cent. under conditions where the supply voltage may vary ± 10 per cent. Three methods of regulation were tried, viz. barretters, a bridge, and a barretter and bridge in series. The results obtained indicate that the regulation provided by a barretter is relatively coarse, by a bridge is fairly fine, and by the barretter and bridge in series is fine and well within the required limits. The efficiencies of the methods decrease with increase in the closeness of the regulation obtained.