Würth Elektronik WE-BMS signal transformers

With WE-MBS, Würth Elektronik has released signal transformers for battery management systems which, due to their galvanic isolation of 4300 VDC/1 min and high operating voltage of up to 1000 VDE, are suitable for use in energy storage systems, e-bikes or e-scooters. Besides the transformers, the WE-BMS series components also include at least one common-mode choke to filter common-mode interference. Their design offers longer physical creepage than comparable products while being compact. Low-profile component variants of 3.45 mm height are also available.

The transformers are optimised for battery management systems and are primarily used for reliable operation and to provide information about charging status. The individual cells of a battery pack are connected in series, as are the downstream BMS controllers.

Voltage differences and electromagnetic interference may occur between series-connected components or boards. The transformer serves to isolate components from each other and suppress EMI. Applications include storage systems for solar installations or uninterrupted power supplies (UPS). As the WE-BMS series is AEC-Q200 qualified, it is also suitable for e-mobility applications and also supports daisy chain, isoSPI and SPI.

Designed for the extended operating temperature range between -40 and 125°C, the component is available from stock in various sizes from 7.6 x 9.5 x 5.5 mm to 15.1 x 15.4 x 3.45 mm with no minimum order quantity. Würth Elektronik provides free samples for engineers.