Satellite power supply DC / DC module input filter design - Power Circuit - Circuit Diagram

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Filter 18.432M

As the "heart" of the satellite, the reliability of the power supply is very high. The DC/DC module in the satellite power system is mainly responsible for converting the output 42V DC voltage into other levels of DC voltage to meet the power requirements of different devices. The DC/DC module input filter has two main functions: one is to prevent the electromagnetic interference generated by the DC/DC module from being transmitted along the power line to affect other devices; the other is to prevent the high-frequency voltage on the power line from being transmitted to the output of the DC/DC module. . The LC passive filter has the above two functions. The goal of this design is to strike a balance between the size and cost of the filter.

Undamped LC Filter Figure 1 shows an undamped LC passive filter. Ideally, a second-order filter is attenuated by 12 dB per octave after the resonant frequency f0. It has no gain before f0 and the gain peaks at the resonant frequency f0.

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