Abstract
A co-planar tab-slot type of interconnect demonstrator for connecting power switching devices and DC bus capacitors has been designed and constructed, aimed at low inductance switching. The demonstrator is composed of a double-sided tab connector and a dual polarity slot. This type of interconnect eliminates the use of screw terminal connection between a power module and the DC bus as well as between the DC bus and power capacitors, thus serves to maintain a coplanar current profile throughout the power distribution path. Parasitic analysis both in impedance testing and in Finite Element simulation suggests that the inductance in the bus loop of the demonstrator is approximately half of that achieved in an equally dimensioned busbar with conventional screw terminals.
Highlights
Low inductance power circuit is critical for safe and efficient operation of high current, high frequency power electronics systems
The bus loop was created by short-circuiting the two co-planar terminals of the tab connector using a thin silver foil attached to both terminals
The results show that the testing values are generally 4% - 10% higher than those from simulation across the entire frequency sweep for the tab-slot demonstrator and 2% - 13 % higher in the case of the screw terminal demonstrator respectively
Summary
Low inductance power circuit is critical for safe and efficient operation of high current, high frequency power electronics systems. Over years of efforts to lower parasitic inductance in switching loop, one successful development is the planar busbar which provides the greatest surface area for mutual flux cancellation [1]. The benefit of this low inductance design is compromised at both ends of the busbar where screw connections are employed to distribute power. This causes disturbance of current path in the bus layers and effectively disables the mutual flux cancellation. An interconnection concept of an alternative design has been proposed and a preliminary demonstrator built, which aims to maintain the coplanar current profile throughout the power distribution path. Based on the proposed concept, a complete half bridge inverter switching cell will be delivered in the near future in which screw terminal connections are to be entirely eliminated
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