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Study of 400Hz Aeronautical Signal Power based on Uni-polar SPWM

The method of 400Hz aeronautical signal power supply system of variable voltage controlled by uni- polar SPWM produced by the Output Compare channels on MCU is introduced in this article. The design of pulse transformer and output filter is referred, and the solution of the minimum pulse is also provided. The test results show that the total harmonic distortion (THD) of the output waveform is 6%, and it can meet the requirement of Aircraft Testing System.
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