How to control the minimum loop area of the PCS power board in an energy storage system?

Controlling the loop area on the PCS power board is a core method for reducing radiated EMI and conducted noise. High di/dt and dv/dt current loops act like efficient antennas. Control methods include:

1. Compact layout: Arrange switching transistors, freewheeling diodes, DC-Link capacitors, and drive circuits as close together as possible, especially components forming high-frequency current paths. For example, connect the DC-Link capacitor directly across the DC input pin of the IGBT module.

2. Use multi-layer busbars: Replace traditional cables with multi-layer composite busbars, alternating positive and negative DC layers and ground layers. Utilize interlayer capacitive coupling to compress the high-frequency loop area to the extreme.

3. Mirrored return path: For critical power circuits (such as phase current output), arrange a complete ground plane directly below or adjacent to it, providing a close-proximity mirrored return path for high-frequency currents, thereby canceling magnetic field radiation.

4. Avoid excessively long leads: All power leads or copper foils should be short and wide.