How to attenuate high-frequency switching noise in a PCS (Power Control System) for energy storage?

Attenuating high-frequency switching noise (typically above 1MHz) in PCS requires a comprehensive filtering strategy.

First, suppress it at the source: optimize drive parameters to smooth the switching waveform; connect small-capacity high-frequency ceramic capacitors in parallel with the switching transistors to reduce dv/dt.

Second, use passive components with excellent high-frequency characteristics along the propagation path: select common-mode inductors that maintain high impedance at high frequencies on the AC output or DC input side; connect multiple small-capacity safety Y capacitors in parallel, such as 2.2nF and 4.7nF, to provide a dispersed and efficient return path to ground for common-mode noise; and use nickel-zinc ferrite cores on the power cables to absorb high-frequency energy in specific frequency bands.

Finally, ensure that the high-frequency filtering components are placed as close as possible to the noise source in the PCB layout, and that the grounding path of the Y capacitors is short and thick to achieve optimal results.