Silicon Carbide Power Device Magnetics and Passives Patent Landscape
Wolfspeed dominates a maturing SiC power-device magnetics and passives landscape, holding more than a quarter of patent records among the hundred largest filers, with the United States as the primary filing jurisdiction. Annual volume has plateaued near the 2022 peak, signalling a field that rewards differentiation in adjacent branches rather than volume-based entry.
Wolfspeed leads a concentrated but internationally active field
Wolfspeed holds the top position with 294 patent records, well ahead of second-ranked Mitsubishi Electric Corporation at 99 and third-ranked Hitachi at 66, establishing a clear first-tier advantage that no single rival yet offsets.
The top five filers collectively account for 35% of the hundred largest filers’ combined total, indicating moderate-to-high concentration at the top while leaving meaningful room for mid-tier challengers such as General Electric, Fuji Electric, and ROHM.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Wolfspeed Inc. | 294 | |
| 2 | Mitsubishi Electric Corporation | 99 | |
| 3 | Hitachi, Ltd. | 66 | |
| 4 | General Electric Company | 59 | |
| 5 | Fuji Electric Co., Ltd. | 58 | |
| 6 | ROHM Co., Ltd. | 52 | |
| 7 | Sumitomo Electric Industries, Ltd. | 47 | |
| 8 | Panasonic Holdings Corporation | 46 | |
| 9 | DENSO Corporation | 38 | |
| 10 | Infineon Technologies AG | 36 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Toshiba Corporation | 31 | |
| 12 | Nissan Motor Co., Ltd. | 29 | |
| 13 | Schneider Toshiba Inverter Europe SAS | 26 | |
| 14 | FLOSFIA Inc. | 24 | |
| 15 | South China University of Technology | 23 | |
| 16 | Renesas Electronics Corporation | 22 | |
| 17 | Halliburton Energy Services, Inc. | 22 | |
| 18 | National Institute of Advanced Industrial Science and Technology (AIST) | 20 | |
| 19 | General Electric Renovables Espana SL | 20 | |
| 20 | CTM Magnetics Inc. | 19 |
Wolfspeed’s scale reflects its vertical integration across SiC device design and power conversion, while the Japanese cohort—Mitsubishi Electric, Hitachi, Fuji Electric, ROHM, Sumitomo Electric, Panasonic, and Denso—collectively forms a structurally significant second tier that could narrow the gap through collaborative filing or acquisitions.
Patent counts for 2025 and 2026 are under-counted due to typical 18–24 month publication lag and should not be read as a real decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing volume has plateaued while semiconductor and power-conversion classes dominate the technology mix
The annual filing trend and the IPC technology composition together reveal a field that has moved through rapid growth into maturity, with activity now concentrated in a handful of core technology classes.
Annual filing trend
Annual filings rose from 130 records in 2017 to a peak of 157 in 2022, then eased—consistent with a maturing field rather than a retreat. The apparent low counts for 2025 and 2026 reflect publication lag and should not be interpreted as a real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L (Semiconductor devices) and H02M (Power conversion) together account for the two largest class counts, reflecting the core device-plus-converter focus of the corpus. Adjacent classes such as H10D, H03K, H02J, H02P, H05K, B60L, H01F, and H01G show meaningfully lower representation, identifying potential under-served branches for targeted entry.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
High frequency inverter/distributed gap inductor—c…
The invention comprises an inverter/converter yielding high frequency harmonics and/or non-sixty Hertz output coupled to a high frequency inductor-capacitor filter apparatus. For example, an inverter/converter apparatus is provided that uses a silicon carbide transistor to output power having a carrier frequency modulated by a fundamental frequency and a… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Silicon carbide based field effect gas sensor for … | 390 |
| 2 | Microturbomachinery | 326 |
| 3 | Three-Terminal Gate-Controlled Semiconductor Switc… | 296 |
| 4 | Silicon carbide MOSFETs with integrated antiparall… | 250 |
| 5 | Non-volatile random access memory cell constructed… | 216 |
| 6 | Silicon carbide mosfets with integrated antiparall… | 175 |
| 7 | Layered dielectric on silicon carbide semiconducto… | 173 |
| 8 | Vertical JFET limited silicon carbide power metal-… | 162 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D strategy
Four structural dimensions—maturity stage, concentration, collaboration patterns, and geographic spread—combine to shape where new entrants and incumbents can most efficiently deploy R&D resources.
Field is at maturity: annual volume has plateaued near peak
The lifecycle stage is Maturity, with annual filings having plateaued near the 2022 peak of 157 records. On a multi-year basis the field is still active, but the rate-of-growth signal no longer favors broad, volume-based filing strategies. R&D investment should target differentiated claims in under-represented branches rather than replicating existing core-device positions.
Maturity stageOne dominant leader; a dense Japanese second tier
Wolfspeed’s 294 patent records give it roughly three times the footprint of Mitsubishi Electric (99) and more than four times that of Hitachi (66). The gap between first and second tier is large enough that challengers will need either a focused niche strategy or collaborative filing to compete at scale. The mid-tier cluster of seven Japanese companies is cohesive enough to function as a collective counterweight.
High concentrationROHM–Nissan and Wolfspeed–Purdue are the most active co-filing pairs
ROHM Co. and Nissan Motor have the strongest co-filing relationship with 15 joint records, pointing to a sustained automotive-power integration partnership. Wolfspeed co-files with Purdue Research Foundation (7 records) and North Carolina State University (6 records), linking it to leading U.S. academic SiC research. Fuji Electric co-files with Osaka University, the National Institute of Advanced Industrial Science and Technology, and the University of Tsukuba, each with 2 joint records, reflecting an industry-academia model common in Japanese SiC development.
Industry-academia linksU.S. leads; China is a significant second jurisdiction
The United States is the primary filing jurisdiction by a wide margin, followed by China and then Europe (EPO), with WIPO (PCT) filings indicating international protection intent. Japan, India, Canada, and Germany round out meaningful secondary markets. The strong U.S. and EPO presence reflects where SiC power device commercialization is currently most active, while China’s volume signals growing domestic ambition in this space.
U.S.-led, global reachGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| ROHM Co., Ltd. | Nissan Motor Co., Ltd. | 15 |
| Wolfspeed Inc. | Purdue Research Foundation | 7 |
| Wolfspeed Inc. | North Carolina State University | 6 |
| ROHM Co., Ltd. | Mazda Motor Corporation | 5 |
| Hitachi, Ltd. | Hitachi Microcomputer System, Ltd. | 2 |
| Hitachi, Ltd. | Hitachi Micro Systems, Inc. | 2 |
| Fuji Electric Co., Ltd. | Osaka University | 2 |
| Fuji Electric Co., Ltd. | National Institute of Advanced Industrial Science and Technology (AIST) | 2 |
| Fuji Electric Co., Ltd. | University of Tsukuba | 2 |
| Sumitomo Electric Industries, Ltd. | Renesas Electronics Corporation | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Wolfspeed focuses on device structure; Mitsubishi Electric anchors in power conversion
The two leading filers occupy distinct but complementary technology positions: Wolfspeed concentrates on semiconductor device architecture while Mitsubishi Electric leads on power conversion circuits, reflecting different points of leverage in the SiC value chain.
Wolfspeed Inc.
Wolfspeed holds 294 patent records, anchored heavily in H01L 29 (semiconductor devices) and H01L 21 (semiconductor fabrication processes), reflecting its core position in SiC device design and manufacture. Its recent-period momentum shows a 25% increase versus the prior window, indicating sustained and accelerating investment rather than a plateaued portfolio. Co-filing with Purdue Research Foundation and North Carolina State University deepens its academic pipeline.
patent records: 294Mitsubishi Electric Corporation
Mitsubishi Electric holds 99 patent records and focuses primarily on H02M 7 and H02M 1 (power conversion circuits), with secondary coverage in H01L 29 (device structure), giving it a system-level angle that complements device-focused rivals. Its recent-period trend is flagged as a new entrant to the recent window, suggesting a renewed or refocused filing push worth monitoring.
patent records: 99| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Wolfspeed Inc. | 25 | ▲ +25% |
| General Electric Company | 5 | ▲ new entrant |
| Mitsubishi Electric Corporation | 3 | ▲ new entrant |
| GeneSiC Semiconductor Inc. | 9 | ▼ -81% |
| ROHM Co., Ltd. | 13 | ▲ new entrant |
| Fuji Electric Co., Ltd. | 6 | ▲ new entrant |
| DENSO Corporation | 1 | ▲ new entrant |
Under-served adjacent branches in pulse logic and grid power supply
Several IPC classes adjacent to the dominant H01L and H02M core show lower filing density relative to their technical relevance to SiC power systems, presenting observations of relative sparsity that may carry entry value for focused researchers.
H03K · Pulse technique and logic circuits
With 145 patent records versus over 1,000 in H01L, H03K is an adjacent branch with meaningful technical relevance: SiC’s high switching speed places demands on gate-drive pulse shaping and logic-level interfacing that are not well covered by existing device-layer patents. An entrant with expertise in high-frequency gate-drive design or SiC-optimized pulse circuits could carve a defensible niche here without competing directly against Wolfspeed’s device-architecture portfolio.
Search this in Eureka →H02J · Power supply and grid systems
H02J shows 126 patent records in this corpus, which is sparse relative to the broad commercial interest in connecting SiC-based inverters to grid infrastructure, microgrids, and energy storage. The branch sits at the interface of power electronics and grid management—an area where system integrators, grid operators, and utility-facing OEMs may find less crowded claim space than in the core device and converter classes. Entry plausibility is moderate for organizations with grid-side or storage-system expertise.
Search this in Eureka →How leading filers differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H01L 29 · Semiconductor devices | H01L 21 · Semiconductor devices | H02M 1 · Power conversion (AC/DC etc.) | H02M 7 · Power conversion (AC/DC etc.) | H02M 3 · Power conversion (AC/DC etc.) |
|---|---|---|---|---|---|
| Wolfspeed Inc. | Strong · 221 | Strong · 218 | Emerging · 19 | Emerging · 19 | Emerging · 18 |
| General Electric Company | Absent | Absent | Strong · 44 | Strong · 49 | Moderate · 21 |
| Hitachi, Ltd. | Strong · 45 | Strong · 29 | Absent | Moderate · 22 | Absent |
| Panasonic Corporation | Strong · 51 | Strong · 38 | Absent | Absent | Absent |
| Mitsubishi Electric Corporation | Absent | Absent | Moderate · 15 | Strong · 55 | Moderate · 18 |
| Sumitomo Electric Industries, Ltd. | Strong · 45 | Strong · 36 | Absent | Absent | Absent |
| ROHM Co., Ltd. | Strong · 42 | Strong · 35 | Absent | Absent | Absent |
Frequently asked questions
The analysis covers 1,157 patent families in the Silicon Carbide Power Device Magnetics and Passives space globally.
Wolfspeed Inc. is the leading filer with 294 patent records, more than three times the count of second-ranked Mitsubishi Electric Corporation at 99 patent records.
The field is at the Maturity stage. Annual filings plateaued near the 2022 peak of 157 records and have not resumed a sustained upward trend, though the multi-year corpus remains active. This suggests the field rewards differentiated positioning rather than broad volume-based filing.
The United States is the primary jurisdiction, followed by China and Europe (EPO), with WIPO (PCT) filings indicating international protection intent. Japan, India, Canada, and Germany represent meaningful secondary markets.
ROHM Co. and Nissan Motor have the strongest co-filing relationship with 15 joint records. Wolfspeed co-files with Purdue Research Foundation (7 records) and North Carolina State University (6 records). Fuji Electric co-files with Osaka University, the National Institute of Advanced Industrial Science and Technology, and the University of Tsukuba, each with 2 joint records.
H03K (Pulse technique and logic circuits) at 145 patent records and H02J (Power supply and grid systems) at 126 patent records are among the lower-density branches relative to the dominant H01L and H02M classes, and both have plausible technical relevance to SiC power system integration.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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