Importance

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Abstract

A supply unit for a tube of the type requiring both a cathode supply and a collector supply, notably for a travelling wave tube. The tube features a collector biasing device, working essentially as a voltage source, delivering a weakly regulated or unregulated and weakly filtered or unfiltered voltage between the collector and the cathode, and having one of its terminals connected to the cathode and the other terminal connected to the collector. Also, a cathode biasing device is featured for delivering a highly regulated and highly filtered voltage to the cathode so as to keep the potential of the cathode constant at its chosen point of operation. A charge storage capacitor, one armature of which is connected to the cathode and the other to ground, is also included. This supply unit operates such that the cathode biasing device has one of its terminals connected to the collector and the other to ground, and the collector biasing device is series mounted with the cathode biasing device and interposed so that the cathode voltage is equal to the sum of the voltages delivered respectively by the collector biasing device and the cathode biasing device. In this way, the cathode biasing device, while essentially achieving the regulation of the cathode voltage by itself, delivers a voltage that is notably lower than the cathode voltage and a power that is notably lower than the cathode power.

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First Claim