Planar Magnetics Patents: Who Leads, Where the Gaps Are 2026
Planar Magnetics for Compact Converters: Patents Behind Winding Capacitance, Leakage Control and Thermal Path Design
Concentration is moderate, not dominant. the leader holds 4 records and the ranked field of 31 companies splits the top 10 at just 60.9% of all 46 records in scope. Filings moved from 2 in 2017 to a peak of 7 in 2025, with the 2021-to-2024 span showing +200% growth (2 to 6). 2025 and 2026 are undercounted because publication typically lags filing by around 18 months, so the true recent trend is higher than shown.
- 1KEYEYE COMM4
- 2INFINEON TECHNOLOGIES AG4
- 3FLEXTRONICS AP LLC3
- 4HYUNDAI MOBIS CO LTD3
- 5FERROAMP ELEKTRONIK3
See the full planar magnetics for compact converters analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on planar magnetics patents
Who holds the most patents in planar transformer and PCB-integrated magnetics design?
Across the 46 records in this dataset, the leading assignee holds 4 records, with fifth place at 3 and tenth place at 2. That is a moderate lead rather than a dominant one: the top 5 assignees together account for 37.0% of all 46 records, and the top 10 reach 60.9%. Practically, this means no single company’s patent estate covers the whole design space, and a freedom-to-operate review needs to check across the ranked field of 31 companies rather than one or two names.
Is planar magnetics patent filing activity growing or slowing down?
Filing activity grew substantially in the recent period covered by complete data, rising from 2 filings in 2021 to 6 in 2024, a +200% increase. 2025 shows the highest count so far at 7 filings. Because patent publication typically lags actual filing by around 18 months, the 2025 and 2026 figures are undercounted and should not be read as a slowdown; the underlying trend through the last complete year is clearly upward.
What patent classes cover planar transformer and PCB-integrated magnetics inventions?
The dominant classification is H01F (magnets, inductors and transformers), appearing in 82.6% of the 46 records, which confirms this field is primarily about magnetic component construction rather than circuit topology. H02M (power conversion) is the next largest at 26.1%, with smaller footprints in H05K (printed circuits), H03K (pulse technique), B60L (EV propulsion), G01V (geophysics-adjacent sensing uses), H10P and H01R. Because a single record can carry multiple IPC classes, these percentages add up to more than 100%, so they should be read individually rather than summed.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Planar Magnetics for Compact Converters covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.