SiC Power Electronics for Grid Patent Landscape 2026
The SiC power electronics for grid space is dominated by a tight cluster of Japanese and US industrial incumbents, with Mitsubishi Electric leading the ranking. Annual filing volume has eased from its 2017 peak, placing the field in a mature-to-declining phase, though adjacent branches in grid systems and motor control remain comparatively sparse.
Mitsubishi Electric leads a highly concentrated field of Japanese and US incumbents
Mitsubishi Electric Corp holds the top position with 177 patent records, followed closely by Toshiba (162) and Fuji Electric (135). The top five filers collectively account for half of the combined total across the hundred largest filers, signalling a strongly concentrated competitive structure.
A clear two-tier structure is visible: a first tier of four Japanese firms and one US major (GE) each holding 90 or more patent records, followed by a second tier — Hitachi, Denso, Semicon Components, Daikin, and Infineon — with 25–53 patent records each. The tier gap between the top five and the rest is substantial.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Mitsubishi Electric Corporation | 177 | |
| 2 | Toshiba Corporation | 162 | |
| 3 | Fuji Electric Co., Ltd. | 135 | |
| 4 | Rohm Co., Ltd. | 125 | |
| 5 | General Electric Company | 90 | |
| 6 | Hitachi, Ltd. | 53 | |
| 7 | Denso Corporation | 53 | |
| 8 | Semicon Components Industries LLC | 36 | |
| 9 | Daikin Industries, Ltd. | 33 | |
| 10 | Infineon Technologies AG | 25 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Panasonic Intellectual Property Management Co., Ltd. | 24 | |
| 12 | GE Renovables España S.L. | 19 | |
| 13 | Wolfspeed, Inc. | 18 | |
| 14 | Sumitomo Electric Industries, Ltd. | 17 | |
| 15 | Hyundai Mobis Co., Ltd. | 17 | |
| 16 | National Institute of Advanced Industrial Science and Technology (AIST) | 16 | |
| 17 | MinebeaMitsumi Power Semiconductor Device Inc. | 15 | |
| 18 | South China University of Technology | 14 | |
| 19 | York International Corporation | 12 | |
| 20 | Hunan University | 12 |
The leaders’ positions reflect decades of vertically integrated R&D in both SiC device fabrication (H01L classes) and power conversion system integration (H02M). This dual focus makes displacement by a device-only or system-only entrant structurally difficult without a comparable breadth of coverage across both layers.
Patent records from 2024–2026 are subject to publication lag and likely under-count recent activity; the apparent drop in those years should not be read as a cessation of new filings. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2017 and technology is concentrated in device and conversion classes
The annual filing trend chart and the technology composition chart together show a field that established its core patent base primarily between 2017 and 2021, with device-level and power-conversion classes dominating the technical output.
Annual filing trend
Filing volume peaked at 150 records in 2017 and has trended downward since, reaching 85–86 records in 2023–2024. The 2025–2026 bars (41 and 4 records respectively) reflect publication lag and should be treated as floor estimates, not real-world activity levels.
↗ Hover for values · click a bar to ask EurekaTechnology composition
The corpus is heavily weighted toward H01L (semiconductor devices) and H02M (power conversion), which together account for the large majority of records. H10D (semiconductor devices, general), H02P (motor and generator control), and H02J (power supply and grid systems) are the next-largest branches but at substantially lower counts, pointing to relatively sparse coverage in system-level and grid-integration aspects.
↗ 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.
Control method for power converters with inverter …
Systems and methods for operating a power converter with a plurality of inverter blocks with silicon carbide MOSFETs are provided. A converter can include a plurality of inverter blocks. Each inverter block can include a plurality of switching devices. The plurality of switching devices can include one or more silicon carbide MOSFETs. A control method can… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Silicon carbide semiconductor device and method of… | 118 |
| 2 | Generator motor for vehicles | 112 |
| 3 | Self-aligned shielded-gate trench MOS-controlled s… | 108 |
| 4 | Power semiconductor module | 100 |
| 5 | Power conversion system with galvanically isolated… | 95 |
| 6 | Sic epitaxial wafer and method for manufacturing s… | 89 |
| 7 | Semiconductor device, and manufacturing method for… | 76 |
| 8 | Power module semiconductor device | 71 |
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 investment
The combination of high concentration, a past-peak filing trend, and sparse coverage in grid-system and control branches shapes where R&D investment carries the most differentiation potential.
Field is in decline from a 2017 peak
The lifecycle stage is classified as Decline, with annual filings easing back from the 2017 peak of 150 records. The multi-year corpus of 1,030 patent families is fully established, and the dominant device and conversion design spaces are densely covered by incumbents. New entrants face a high prior-art density in core SiC MOSFET and power module areas.
Lifecycle: DeclineTop five filers hold half the ranking share
The top five applicants — Mitsubishi Electric, Toshiba, Fuji Electric, Rohm, and GE — account for 50% of the combined total among the hundred largest filers. This level of concentration means that white-space opportunities are more likely to emerge in adjacent or system-level branches than in the core device classes already dominated by incumbents.
High concentrationFuji Electric–AIST partnership is the most active co-filing pair
The most active co-filing relationship is between Fuji Electric and Japan’s National Institute of Advanced Industrial Science and Technology (AIST), with 13 joint patent records. Rohm and Mazda have co-filed 5 records, reflecting automotive integration work. Toshiba has collaborated with both the National Institute for Materials Science (NIMS, 2 records) and Toshiba Infrastructure Systems (1 record), while Denso and Toyota have 2 joint records. Overall, collaboration activity is modest relative to the corpus size, with most filers operating independently.
Industry–institute linksUS dominates filings; China is the emerging secondary jurisdiction
The United States is by far the leading filing jurisdiction. China is the second-largest jurisdiction, followed by Japan, EPO, and WIPO (PCT). India and South Korea have smaller but non-negligible presences. The US-centric distribution reflects both the size of the US grid-modernisation market and the filing strategies of the leading Japanese and US applicants.
US-led, China growingGo 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 |
|---|---|---|
| Fuji Electric Co., Ltd. | National Institute of Advanced Industrial Science and Technology (AIST) | 13 |
| Rohm Co., Ltd. | Mazda Motor Corporation | 5 |
| Toshiba Corporation | National Institute for Materials Science (NIMS) | 2 |
| Fuji Electric Co., Ltd. | Osaka University | 2 |
| Denso Corporation | Toyota Motor Corporation | 2 |
| Toshiba Corporation | Toshiba Infrastructure Systems & Solutions Corporation | 1 |
| General Electric Company | GE Energy Power Conversion Technology Ltd (UK) | 1 |
| General Electric Company | GE ENERGY POWER CONVERSION TECH LIMITEDU | 1 |
| Hitachi, Ltd. | Hitachi Power Semiconductor Device, Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Mitsubishi Electric leads on system integration; Toshiba leads on device fundamentals
The two largest filers pursue distinct but overlapping technical strategies, making them complementary benchmarks for understanding where the design space is most densely covered.
Mitsubishi Electric Corp
Mitsubishi Electric holds the top position with 177 patent records. Its technical emphasis spans H02M (power conversion, AC/DC) and H01L29 (semiconductor devices), reflecting a dual focus on both the SiC device layer and its integration into conversion systems — a breadth that is distinctive among the leading filers. Recent momentum shows a sharp decline (▼ –70% in recent filings vs the prior period), consistent with the broader field maturation.
patent records: 177Rohm Co Ltd
Rohm ranks fourth overall with 125 patent records and is the only top-five filer showing positive recent momentum (▲ +11% vs the prior period). Its technical focus is centred on H01L29 and H01L21 (semiconductor device fabrication), with growing coverage in H02M7 (power conversion), suggesting a deliberate move toward system-level integration. This counter-trend trajectory makes Rohm the most active current filer among the established leaders.
patent records: 125| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Mitsubishi Electric Corporation | 13 | ▼ -70% |
| Toshiba Corporation | 31 | ▼ -52% |
| Fuji Electric Co., Ltd. | 18 | ▼ -28% |
| Rohm Co., Ltd. | 31 | ▲ +11% |
| General Electric Company | 1 | ▼ -91% |
| Hitachi, Ltd. | 1 | ▼ -93% |
| Denso Corporation | 1 | ▼ -94% |
| GeneSiC Semiconductor Inc. | 4 | ▼ -85% |
Grid systems and motor-control branches are under-served relative to device classes
Compared to the dominant H01L and H02M branches, several adjacent IPC classes have noticeably lower patent record counts, which — in the context of this field — represent comparatively sparse areas where technical coverage may not yet match application needs.
H02J · Power Supply & Grid Systems
H02J covers grid-tie interfaces, energy storage integration, and power supply management — exactly the system-level functions that differentiate SiC converters in grid applications. With 115 patent records against over 1,000 in H01L, this branch is sparse relative to its technical relevance. Entry paths include grid-forming converter control, fault-ride-through architectures, and SiC-based solid-state protection for distribution grids.
Search this in Eureka →H02P · Control of Motors & Generators
H02P (control of motors and generators) has 127 patent records in the corpus, modest given the scale of SiC adoption in variable-speed drives connected to grid-tied industrial motors and wind generators. Sparse coverage here may reflect that control algorithm patents are often filed separately from device patents. Potential entry areas include SiC-enabled high-frequency switching control for grid-connected drives and regenerative grid feedback in industrial applications.
Search this in Eureka →How leading applicants differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H01L 29 · Semiconductor devices | H02M 7 · Power conversion (AC/DC etc.) | H01L 21 · Semiconductor devices | H02M 1 · Power conversion (AC/DC etc.) | H10D 62 · Semiconductor devices (general) |
|---|---|---|---|---|---|
| Toshiba Corporation | Strong · 153 | Moderate · 40 | Strong · 78 | Absent | Moderate · 42 |
| Mitsubishi Electric Corporation | Strong · 101 | Strong · 114 | Moderate · 38 | Moderate · 27 | Moderate · 29 |
| Fuji Electric Co., Ltd. | Strong · 107 | Moderate · 33 | Strong · 67 | Emerging · 10 | Moderate · 28 |
| Rohm Co., Ltd. | Strong · 96 | Moderate · 42 | Strong · 62 | Emerging · 13 | Emerging · 17 |
| General Electric Company | Strong · 56 | Strong · 49 | Strong · 29 | Strong · 31 | Moderate · 14 |
| Hitachi, Ltd. | Strong · 44 | Strong · 33 | Moderate · 21 | Moderate · 10 | Emerging · 8 |
| Denso Corporation | Strong · 48 | Moderate · 12 | Moderate · 24 | Absent | Absent |
Frequently asked questions
The corpus covers 1,030 patent families. The United States is the leading filing jurisdiction, followed by China, Japan, and Europe (EPO).
Mitsubishi Electric Corp is the top-ranked filer with 177 patent records, followed by Toshiba (162), Fuji Electric (135), Rohm (125), and GE (90).
No. Annual filing volume peaked in 2017 at 150 records and has eased since. The lifecycle stage is classified as Decline. The 2025–2026 data points are subject to publication lag and undercount recent activity.
H01L (semiconductor devices) and H02M (power conversion) are by far the largest branches. H10D, H02P, and H02J are the next tier but at substantially lower counts, indicating that system-level and grid-integration aspects are comparatively sparse.
Rohm Co Ltd is the only top-five filer with positive recent momentum, with recent filings running approximately 11% above the prior comparable period. All other major incumbents show declining recent activity.
The most active co-filing pair is Fuji Electric and Japan’s National Institute of Advanced Industrial Science and Technology (AIST), with 13 joint patent records. Rohm and Mazda have 5 co-filed records, and Denso and Toyota have 2. Overall, the level of formal collaboration is modest relative to the corpus size.
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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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