Circuit for improving traveling wave tube amplifier filament service life

Abstract

A circuit for improving traveling wave tube amplifier filament service life comprises a filament isolation transformer T1 and a filament voltage regulation circuit. The filament voltage regulation circuit comprises an audion Q1, an operational amplifier N1, a resistor R1, a resistor R2, a resistor R3 and a current-limiting resistor R4. The filament isolation transformer T1 is formed by a primary side winding and a vice side winding, and the primary side winding is composed of two windings and connected with a traveling wave tube power supply interior direct current (DC) / alternating current (AC) circuit. A centre tap is switched in a collector of the audion Q1, and the vice side winding of the filament isolation transformer T1is connected with a traveling wave tube filament load R5. An emitting electrode of the audion Q1 is in series connection with the current-limiting resistor R4 and then connected to the ground. Reference voltage is switched in a homodromous input end of the operational amplifier N1. One end of the resistor R2 is switched in a reverse input end of the operational amplifier N1, and the other end of the resistor R2 is connected to the ground. An output end of the operational amplifier N1 is in series connection with the resistor R1 and then is switched in a base electrode of the audion Q1. One end of the resistor R3 is switched in the base electrode of the audion Q1, and the other end of the resistor R3 is connected to the ground. The reverse input end of the operational amplifier N1 is connected with the emitting electrode of the audion Q1.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, and relates to a circuit for improving the filament life of a traveling wave tube amplifier. Background technique [0002] Traveling wave tube amplifier (TWTA) consists of two parts: traveling wave tube (TWT) and traveling wave tube power supply (EPC), such as figure 1 shown. Among them, the function of the traveling wave tube is to use its unique slow wave structure to amplify the power of the input microwave signal; the function of the traveling wave tube power supply is to receive the remote control command signal and convert the primary power provided by the satellite into the various levels required by the traveling wave tube. High voltage, at the same time, provide telemetry data of the working status of the traveling wave tube amplifier, and ensure that the traveling wave tube amplifier is powered off in time when abnormal conditions occur, so as to protect the traveling w...

AI Technical Summary

Problems solved by technology

However, due to the short start-up time of the traveling wave tube power supply (mostly about 10mS), and the voltage overshoot, the heater is in a cold state at the moment when the filament is powered on, the impedance is small, and the current impact is large, which affects the traveling wave tube. The filament causes a current shock, which affects the reliability of the traveling wave tube

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