The present disclosure relates to the field of power electronic modules. More specifically, the present disclosure relates to a printed circuit board comprising a plurality of power transistor switching cells in parallel.

Power electronic modules have multiple applications, for example in power conversion equipment such as industrial motor drives, embedded motor drives, uninterruptible power supplies, etc. Power electronic modules are also used in inverters for renewable energies as wind turbines, photovoltaic panels and electric vehicles (EVs). A power electronic module comprises various types of electric and electronic components, including transistors.

Transistors used in power electronic modules are usually referred to as power transistors. A power transistor has specific characteristics, such as a housing capable of supporting important instantaneous power dissipation and high voltage and current which makes the power transistor suitable for being used in an electronic power module.

A common electronic design consists in using several power transistors in parallel. For example, it is common to find packages available on the market which encapsulate fast power transistors connected in parallel. In this configuration, it is difficult to ensure a uniform distribution of electrical currents in dynamic conditions, more specifically during the switching periods of the transistors. Electrical current disparities during the switching transient results in higher switching losses for the transistors absorbing higher electrical currents. These switching losses cause additional heating in these transistors, altering their long-term reliability.