TECHNOLOGIES & APPLICATIONS

A TRANSISTOR-BASED MODULATOR FOR A MICROWAVE MAGNETRON

Abstract

A modulator designed as a power supply for a microwave magnetron with an output peak power of radiation 3 MW is described. The 100 transistors used in the modulator are connected in parallel, and their capacitors are switched to the primary winding of a pulse transformer.

Pulse parameters:

Load pulse power - 5 MW
Primary peak voltage - 850 V
Primary peak current - 6600 A
Secondary peak voltage - 50 kV
Secondary peak current - 100 A
Pulse duration - 0,6-6 µs
Pulse risetime - Less than 0,5 µs
Pulse repetition rate 200 Hz - (duration 6 µs)

A functional diagram of the modulator

Fig. 1. Oscillograms of the modulator (1) voltage (14 kV/div)
and (2) current (35 A/div) measured
at a 500-active load. Time base: 1 µs/div.

Fig. 2. Oscillograms of (1) the voltage pulse across
the magnetron (14 kV/div) and (2)
the generated microwave pulse. Time base: 1 µs/div.

For further information please contact:

Vadim A. Vizir
Dr. Sci. (Engineering), Leading Researcher
Phone: (3822) 49-26-73, Fax: (3822) 49-27-51
E-mail: kim@oit.hcei.tsc.ru

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