Electromagnetic interference filter for automotive electrical systems

An electromagnetic interference (EMI) filter for an automotive power electronics unit comprising:

• a substrate comprising first and second conductive layers and an insulating layer therebetween, the substrate having first, second, and third portions, the third portion being between the first and second portions;
• first and second input terminals mounted on the first portion the substrate;
• a plurality of filtering capacitors mounted on the third portion of the substrate;
• a common mode choke coupled to the substrate and arranged such that the common mode choke extends around the third portion of the substrate and the first and second conductive layers;
• and
• first and second power connectors mounted on the second portion of the substrate.

An automotive propulsion system comprising:

• an electric motor;
• at least one direct current (DC) voltage source;
• a power inverter coupled to the electric motor and the at least one DC voltage source, the power inverter comprising a plurality of power switching devices;
• an electromagnetic interference (EMI) filter coupled to the at least one DC voltage source and the power inverter, the EMI filter comprising:
• a substrate comprising first and second conductive members;
• first and second input terminals mounted to a first portion of the substrate;
• a plurality of capacitors mounted to the substrate;
• first and second power connectors mounted to a second portion of the substrate;
• and
• a common mode choke coupled to the substrate and arranged such that the common mode choke extends around a third portion of the substrate,
• wherein the first and second portions of the substrate are on opposing sides of the third portion of the substrate
• a controller in operable communication with the power inverter and coupled to the electric motor and the at least one DC voltage source, the controller being configured to operate the plurality of power switching devices.