New Offline Flyback Transformer Series Reduces Footprint by 30 Percent

Jan21_MID-MHCWurth Electronics Midcom Inc. has announced the release of a new series of flyback transformers targeting smart metering applications. The new MID-MHC series meets safety standards requiring high creepage and clearance while significantly reducing the transformer footprint.

“Many of our metering customers must meet strict safety standards with large creepage distance requirements,” said Chris Heisel, Product Manager for Metering and Telecom at Wurth Electronics Midcom. “Meanwhile, power requirements for data transmission are increasing, and power supply designers continue to struggle with noise at the transformer. The MID-MHC series employs creative new strategies to meet these challenges.”

The key is an innovative combination of core and bobbin design that employs a modified EP-core on a raised bobbin. The resulting package can support creepage and clearance requirements up to 14 mm primary to-secondary and up to 8 mm between two secondary outputs. The raised design allows this to occur on a 22.1 mm by 15.7 mm footprint, which is 30 to 60 percent smaller than existing designs using horizontal E-core packages to achieve similar power levels. Additionally, the EP-core design improves noise performance relative to E-core designs.

The MID-MHC series includes universal input offline transformers with one to three outputs of 3.3 to 24 V to demonstrate the capabilities of the package. Wurth Electronics Midcom will design custom transformers based on the MID-MHC package to meet individual customer’s applications.

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