The solid-state transformer for data centers field is in a Growth stage, with multi-year filing volume up 146% against the prior three-year window, though annual output has eased from its 2023 peak. Delta Electronics (Shanghai) leads a highly concentrated field, holding the top-ranked position among the hundred largest filers, with Huawei Digital Power as the principal challenger.
Delta Electronics (Shanghai) ranks first among applicants, followed by Huawei Digital Power Technology and Causam Energy. The top five filers collectively account for 57% of the combined output of the hundred largest filers, signaling a strongly consolidated competitive structure.
A clear two-tier gap separates the top two incumbents — Delta Electronics (Shanghai) and Huawei Digital Power — from the remaining players. Georgia Tech Research Corporation anchors the academic tier, underscoring the field's ongoing dependence on university-driven power-electronics research.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Delta Electronics (Shanghai) Co., Ltd. | 26 | |
| 2 | Huawei Digital Power Technologies Co., Ltd. | 19 | |
| 3 | Causam Energy Inc. | 13 | |
| 4 | Georgia Tech Research Corporation | 11 | |
| 5 | Ohmium International Inc. | 8 | |
| 6 | Huawei Technologies Co., Ltd. | 5 | |
| 7 | Francisco Daniel Freijedo Fernandez | 4 | |
| 8 | Xi'an Weiguang Energy Technology Co., Ltd. | 3 | |
| 9 | Shanghai Jiao Tong University | 3 | |
| 10 | Epoch Innova Pte Ltd | 3 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Virginia Tech Intellectual Properties Inc. | 3 | |
| 12 | Microsoft Technology Licensing LLC | 3 | |
| 13 | Eaton Intelligent Power Ltd. | 3 | |
| 14 | Marel Power Solutions Inc. | 3 | |
| 15 | Prodrive Technologies Innovation Services BV | 2 | |
| 16 | ZTE Corporation | 2 | |
| 17 | Google LLC | 2 | |
| 18 | Equinix Inc. | 2 | |
| 19 | China United Network Communications Group Co., Ltd. | 2 | |
| 20 | Vertiv Corp. | 2 |
Delta Electronics (Shanghai) and Huawei Digital Power's dominant positions in power-conversion circuits give them substantial freedom to set technical direction; challengers entering now must differentiate on system-level integration or specialized sub-topologies to avoid direct overlap.
The most recent 18–24 months of filings are under-counted due to standard patent-publication lag; figures for 2024–2026 should be treated as provisional minimums. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Two charts frame the field's trajectory: an annual filing trend that traces the surge from 2020 onward, and a technology-class breakdown that reveals the overwhelming dominance of power-conversion circuitry alongside a set of smaller, adjacent branches.
Filing activity was negligible through 2019, then accelerated sharply from 2020, peaking at 28 records in 2023. The apparent step-down in 2024 and 2025 reflects publication lag rather than a genuine deceleration — treat those bars as floors, not ceilings.
↗ Hover for values · click a bar to ask EurekaH02M (power conversion) dominates with 93 records, followed by H02J (power supply and grid systems) at 61. All remaining classes — including G06F, G08B, H01F, C25B, and H03K — each carry single-digit record counts, pointing to narrow technical concentration with several under-populated adjacent branches.
↗ Hover for values · click a bar to ask EurekaCitation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
A power electronic transformer includes three modules, the three modules each including: a first submodule; a second submodule; and a third submodule including a first power conversion module including N first power conversion units having input ports connected to the N output ports of the first submodule in one-to-one correspondence, and a second power… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Isolated dynamic current converters | 83 |
| 2 | Power electronic conversion unit and system | 32 |
| 3 | Isolated dynamic current converters | 24 |
| 4 | Power conversion using a series of power converters | 21 |
| 5 | Cascade converter system and method of putting con… | 19 |
| 6 | Power supply apparatus, power supply system, and d… | 14 |
| 7 | Method and apparatus for actively managing electri… | 14 |
| 8 | 一种数据中心的交直流供电结构 | 9 |
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.
The combination of a Growth lifecycle, high concentration among a small set of players, and a dominant power-conversion focus creates clear strategic implications for engineers and investment decision-makers.
The field sits firmly in the Growth stage: the three-year recent window outpaces the prior three-year window by 146%. Annual volume has eased from the 2023 peak of 28 records, but publication lag means 2024–2025 figures are understated. Entry windows remain open, but the technology core is solidifying rapidly around isolated power-conversion topologies.
Growth · post-peak cautionDelta Electronics (Shanghai) and Huawei Digital Power together anchor the field, with Causam Energy, Georgia Tech Research Corporation, and Ohmium International rounding out the top five. This concentration means late entrants face an established prior-art landscape in core H02M sub-classes and must identify differentiated technical routes or application niches to reduce collision risk.
High concentrationDelta Electronics (Shanghai) co-filed with Shanghai Jiao Tong University on 3 occasions, reflecting a deliberate academia-industry bridge in power-electronics research. Francisco Daniel Freijedo Fernandez co-filed with Huawei Digital Power Technology (2 instances) and Huawei Technologies (2 instances), suggesting Huawei uses individual inventor relationships to expand its patent footprint. These partnerships represent potential alliance signals worth monitoring.
Industry–academia tiesThe United States leads with 52 patent records, followed by Europe (EPO) at 28 and WIPO (PCT) at 21. China carries 11 records despite hosting two of the top three applicants, suggesting those applicants prioritize US and international coverage. India at 7 records is a notable emerging jurisdiction, possibly anticipating data-center build-out demand in that market.
US-primary, global spreadGo 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 |
|---|---|---|
| Delta Electronics (Shanghai) Co., Ltd. | Shanghai Jiao Tong University | 3 |
| Francisco Daniel Freijedo Fernandez | Huawei Digital Power Technologies Co., Ltd. | 2 |
| Francisco Daniel Freijedo Fernandez | Huawei Technologies Co., Ltd. | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Both leaders entered the corpus recently and have concentrated their filings almost entirely in power-conversion sub-classes, establishing dense prior-art positions that challengers must navigate carefully.
Delta Electronics (Shanghai) holds 26 patent records — the highest count in the ranked corpus — concentrated in H02M1, H02M3, and H02M7 power-conversion sub-classes. Its momentum is classified as a new entrant, meaning its entire recorded position has been built within the recent filing window, making it the most rapidly established incumbent in this field.
patent records: 26Huawei Digital Power Technology holds 19 patent records, emphasizing H02M7 (AC/DC conversion) and H02J3 (grid interconnection) — a broader systems-level stance than Delta's circuit-focused portfolio. Also flagged as a new entrant in the recent window, its co-filing relationship with Francisco Daniel Freijedo Fernandez extends its reach into individual-inventor sub-topologies.
patent records: 19| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Delta Electronics (Shanghai) Co., Ltd. | 19 | ▲ new entrant |
| Huawei Digital Power Technologies Co., Ltd. | 11 | ▲ new entrant |
| Georgia Tech Research Corporation | 1 | ▲ new entrant |
| Ohmium International Inc. | 6 | ▲ new entrant |
| Huawei Technologies Co., Ltd. | 1 | ▲ new entrant |
| Francisco Daniel Freijedo Fernandez | 2 | ▲ new entrant |
| Xi'an Weiguang Energy Technology Co., Ltd. | 3 | ▲ new entrant |
| Microsoft Technology Licensing LLC | 3 | ▲ new entrant |
Several IPC classes appear at low record counts relative to the dominant H02M/H02J core. These observations indicate relative sparsity; they represent potential entry angles only where technical relevance and a realistic development path both exist.
With only 7 patent records, high-frequency magnetic component design for solid-state transformers is notably sparse relative to the circuit-level work in H02M. Transformer core materials, winding geometry, and thermal management at high switching frequencies are technically critical to system efficiency and power density in data-center deployments, yet remain lightly claimed. An entrant with magnetic-materials or advanced-winding expertise could establish differentiated positions here without immediate collision with the dominant H02M incumbents.
Search this in Eureka →Only 7 records touch digital data-processing aspects — covering areas such as load-aware control algorithms, digital twins of power distribution, and firmware for dynamic reconfiguration of transformer stages within data-center power hierarchies. Causam Energy's G08B signaling work hints at intelligent monitoring, but the algorithmic and software-defined control layer for SST orchestration remains sparsely patented. Organizations with power-management software capabilities could explore this branch as a complement to hardware-focused incumbents.
Search this in Eureka →Strength of each leader across the main technology routes.
| Player | H02M 1 · Power conversion (AC/DC etc.) | H02M 7 · Power conversion (AC/DC etc.) | H02M 3 · Power conversion (AC/DC etc.) | H02J 3 · Power supply & grid systems | H02J 9 · Power supply & grid systems |
|---|---|---|---|---|---|
| Delta Electronics (Shanghai) Co., Ltd. | Strong · 18 | Strong · 13 | Strong · 17 | Moderate · 4 | Emerging · 2 |
| Huawei Digital Power Technologies Co., Ltd. | Strong · 8 | Strong · 13 | Moderate · 4 | Strong · 10 | Moderate · 5 |
| Ohmium International Inc. | Absent | Strong · 5 | Strong · 5 | Strong · 3 | Moderate · 2 |
| Georgia Tech Research Corporation | Strong · 8 | Absent | Strong · 5 | Absent | Absent |
| Huawei Technologies Co., Ltd. | Strong · 5 | Strong · 5 | Absent | Strong · 3 | Absent |
| Causam Energy Inc. | Absent | Absent | Absent | Strong · 13 | Absent |
| Eaton Intelligent Power Ltd. | Strong · 3 | Strong · 3 | Strong · 3 | Absent | Absent |
The evidence corpus contains 112 patent families in scope for this technology topic globally.
Delta Electronics (Shanghai) ranks first with 26 patent records among the top 100 filers, ahead of Huawei Digital Power Technology at 19 and Causam Energy at 13.
The field is classified as Growth: recent three-year filing volume is 146% above the prior three-year window. Annual output peaked in 2023 at 28 records and has eased since, but the most recent years are further understated by publication lag, so the slowdown should not be interpreted as a structural decline.
The United States leads with 52 patent records, followed by Europe (EPO) at 28, WIPO (PCT) at 21, China at 11, and India at 7. Note these are record-level counts; a single family may appear in multiple jurisdictions.
H02M (power conversion) with 93 records and H02J (power supply and grid systems) with 61 records together dominate the corpus. Adjacent classes such as H01F (magnetics and transformers), G06F (digital data processing), and H03K (pulse technique and gate-drive circuits) each carry only 6–7 records, representing under-served branches relative to the core.
Delta Electronics (Shanghai) co-filed with Shanghai Jiao Tong University on 3 occasions. Francisco Daniel Freijedo Fernandez co-filed with Huawei Digital Power Technology on 2 occasions and with Huawei Technologies on 2 occasions. Georgia Tech Research Corporation and Virginia Tech Intellectual Properties also appear as independent academic filers, confirming a meaningful university presence in the innovation ecosystem.
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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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