Resonant & Soft Switching Patents: Top Companies & Trends 2026
Resonant and Soft Switching Topology Patents: Who Files, What They Claim, Where the Gaps Sit
17.2% concentration at the top. The five most active filers hold 854 of 4,977 records in scope, but that still leaves a long tail of single- and few-filing entrants below them. Filings ran from 327 in 2017 to a comparable 325 in 2021, then fell to 221 by 2024 — a -32% move over that span. 2025 and 2026 figures (down to 13 so far in 2026) are undercounts still filling in as publication catches up with filing.
- 1INFINEON TECH AUSTRIA AG3.8%
- 2DELTA ELECTRONICS INC(CN)3.7%
- 3SIGNIFY HOLDING BV3.4%
- 4KONINKLIJKE PHILIPS NV3.2%
- 5HUAWEI DIGITAL POWER TECH CO LTD3.1%
See the full resonant and soft switching topologies 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 about this landscape
Who holds the most patents in resonant and soft switching converter technology?
No single company dominates this field. The top-ranked assignee holds 190 of the 4,977 records in scope, and the five leading assignees combined account for 854 records, or 17.2% of the total. That leaves the large majority of filings spread across a long tail of other companies, so freedom-to-operate analysis needs to look well beyond the handful of largest filers.
Is patent filing in LLC and resonant converter technology still growing?
Filing volume peaked in 2017 at 327 records and stayed close to that level through 2021 (325 records), before falling to 221 by 2024, a -32% change over that three-year span. Figures for 2025 and 2026 are lower still, but publication typically lags filing by around 18 months, so those recent years understate true filing activity and should not be read as continued decline.
What does zero voltage switching add to an LLC converter patent claim?
Zero voltage switching (ZVS) is one of the core search terms defining this landscape alongside LLC and resonant converter language, and it appears throughout claims aimed at cutting switching losses during transitions. Many filings pair ZVS with related concepts such as magnetizing inductance, gain curve control or burst mode operation at light load, since these mechanisms are typically claimed together as part of the same resonant tank or control scheme rather than in isolation.
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 Resonant and Soft Switching Topologies 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.