A high power TWT power processing system

A power processing system design for a space-type high power (200W RF) multi-stage depressed collector traveling wave tube is described. Operating requirements are set forth and a block diagram is presented illustrating the overall approach used in providing the requisite outputs. The basic power circuit is illustrated and overall performance, design characteristics and unique features are discussed. A power processing system (PPS) consists of various circuits which convert 76 Vdc power (and limited amount of 28 Vdc power) to the levels necessary for operating a high power, ten collector coupled cavity TWT. The following supply outputs and functions are provided: . -11.3k Vdc regulated cathode supply. . Multiple depressed collector supply (10 collectors, ranging from 0 to -11.3k Vdc). . +150 to +550 Vdc adjustable anode supply. . Current regulated (7 W max.) cathode heater supply. . Coπmand and protection logic system. . Telemetry signal conditioning. . Thermal heater control system. The discussion presented covers system design considerations (as affected by the special load interface characteristics of a multiple collector TWT), the primary PPS high voltage power circuit, high voltage components and design, grounding and isolation philosophy and PPS performance characteristics including fault protection, efficiency and weight.