Solder-Free Connection
A custom designed spring, made from a unique copper alloy, creates an electrical connection between the substrate inside the module and external circuit board.
Different spring types are used depending on the requirements. The popular motor drive module MiniSKiiP uses a unique S-bend spring for both auxiliary and power terminals.
A more traditional coil type spring is used for auxiliary contacts in the SEMiX Spring product line. In both cases, the use of a spring allows for quick assembly (and disassembly) while also making a reliable connection over the lifetime of the product. The spring provides uninterrupted electrical contact even during the shock and vibration experienced by modern power converters. The lack of solder means the connection is also resilient against fatigue from thermal or mechanical stress.
Semikron Danfoss has performed numerous tests to confirm the reliability of the spring contact. This includes shock, vibration, fretting corrosion, and corrosive environment testing.
For designs incorporating multiple power modules connected to a single PCB, SPRiNG Technology offers a unique advantage. The spring contact easily takes up variances in height due to mechanical tolerances. This avoids mechanical stress on the PCB and modules that occurs with a fixed (e.g. solder) connection.