Optimal design of 400 Hz power filter for aircraft switching power supply

摘要

This study aimed to develop a AC 115 V ± 10%, 3-phase, 400 Hz, 4 A power filter with an attenuation efficiency of up to 70 dB and insulation resistance of below 0.5 Ω for application to the switching power supply of military aircraft. The 400 Hz power filter was designed and fabricated as an all-in-one structure with components that were minimized in terms of size and weight and a low pass filter for the switching noise. The test results showed that it had an excellent attenuation efficiency of up to 73.66 dB in the 100 kHz ～ 30 MHz band. Furthermore, a performance verification test was performed by applying the power filter to an aircraft switching power supply to check for the inhibition of electromagnetic interference in the power unit, and the results confirmed its reliability.