How should the power supply filtering of the backplane of a smart controller (PAC) be designed?

The power filtering design of the PAC backplane needs to address the challenges posed by multiple slots, high current, and long-distance transmission. Firstly, a high-current common-mode inductor, such as the CMZ7060A-701T (rated current 15A), is deployed at the backplane power input, along with two safety capacitors for the first stage of filtering. For each slot's power pins, a PBZ3216E120Z0T ferrite bead (120Ω) and a 100μF electrolytic capacitor are placed nearby for decoupling, forming a distributed filtering network. For high-speed differential backplane buses, CM...

The Z20212A-900T common-mode inductor suppresses common-mode noise; the backplane PCB adopts a multi-layer design with independent power and ground layers, and the layer spacing is less than 0.2mm to reduce impedance; the power trace width is calculated based on current density to ensure that the voltage drop is less than 2%; through simulation and actual measurement, this filtering design can make the backplane power noise less than 50mV in the 10kHz-100MHz frequency band, and the crosstalk between each slot is less than -60dB, meeting the IEC61000-4-11 voltage sag immunity test requirements;