Power Conversion Patents: Top Companies & Filing Trends 2026
- 13.6% sits with five companies. The top five assignees combined account for 12,671 of the 93,079 records in scope, while the ranked leaders extend to 100 companies with a long tail below them.
- Filing has cooled from its 2019 peak. Activity peaked at 1,274 records in 2019 and fell 40% between 2021 (1,201) and 2024 (717) — the last year with a complete publication picture.
- H02M dominates the classification mix. 14.0% of all records carry the core power-conversion subclass H02M, more than four times the next most common class, H02J at 4.0%.
Filing growth compares 2021 (1,201 records) with 2024 (717) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 93,079 records in scope (CR5), not by the ranked leaders only.
What the power conversion patent record shows
Power conversion covers the circuits, control schemes and switching hardware that move electrical energy between AC, DC and different voltage or frequency levels — the domain behind H02M power converters, H02P motor and generator control, and the drive and sensing circuitry that supports them. The 93,079 records in this dataset span filings from 2015 onward, built from a search targeting power conversion together with the switching, sensing and control-circuit terms that define implementation-level claims rather than pure theory.
Filing concentrates around a small set of large electronics and automotive manufacturers, but the ranked leaders run to 100 companies, and most of them hold a modest share each. Recent-year filing counts should be read cautiously: publication lags filing by roughly 18 months, so the last one to two years in any chart are still filling in.
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Filing trends and technology composition
Two views of the same 93,079-record dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017–2026
Filings ran near 1,190 in 2017, peaked at 1,274 in 2019, and dropped 40% from 1,201 in 2021 to 717 in 2024 — the most recent year with a reliable count. 2025 and 2026 figures (56 by the cut-off) will rise as publication catches up, so they should not be read as a continued decline.
Technology composition by IPC subclass
H02M (power conversion) appears on 14.0% of records, well ahead of H02J (power supply and grid systems, 4.0%) and H02P (motor and generator control, 2.4%). Smaller shares in B60L, H03K, H01L, G05F and H05B mark adjacent branches — EV propulsion, pulse logic, semiconductor devices, variable control and heating/lighting circuits — where power-conversion claims overlap with other domains. Because records can carry multiple IPC codes, these shares sum to more than the record total.
Shares are the percentage of the 93,079 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Power Conversion Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about power conversion patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US20250023486A1 — Electric power conversion apparatus and electric power conversion system
Filed by TDK Corporation, this application describes a power conversion apparatus built around a switching circuit, a transformer with first and second windings, a rectifying circuit with its own switching device, a smoothing circuit, and a control circuit that drives a driving circuit. The control circuit alternates a first and second operation before power is supplied from the first terminal to the second, coordinating the switching and rectifying circuits so the two operations transfer power in a controlled sequence.Published 2025-01-16 — illustrates how current filings combine transformer-based isolation with sequenced switching control rather than claiming a converter topology alone.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4965709A | Switching converter with pseudo-resonant DC link | 1,392 |
| 2 | US7007176B2 | System and method for highly phased power regulation using adaptive compensation control | 1,155 |
| 3 | US20060022214A1 | LED package methods and systems | 854 |
| 4 | US20100164296A1 | Wireless energy transfer using variable size resonators and system monitoring | 691 |
| 5 | US20100148723A1 | Bidirectional wireless power transmission | 627 |
| 6 | US5225712A | Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation | 620 |
| 7 | US20080143188A1 | Distributed power harvesting systems using DC power sources | 613 |
| 8 | US20120081009A1 | Apparatus, Method and System for Providing AC Line Power to Lighting Devices | 600 |
| 9 | US20080307240A1 | Power management electronic circuits, systems, and methods and processes of manufacture | 595 |
| 10 | US6111767A | Inverter integrated instrumentation having a current-voltage curve tracer | 563 |
Citation counts reflect age as much as importance — older records have had more time to accumulate citations within this corpus, so treat the table as a signal of historical influence rather than current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for filing strategy
Three patterns stand out once volume, concentration and classification are read together.
The top of the field is not a monopoly
Five companies hold 12,671 records, 13.6% of all 93,079 in scope; the top ten add up to 21.2%. That leaves the bulk of filing activity distributed across a ranked list of 100 companies and an unranked tail beyond them — a field with recognisable leaders but no single gatekeeper.
Volume has pulled back from its 2019 peak
Filing peaked at 1,274 records in 2019 and declined 40% from 1,201 in 2021 to 717 in 2024, the last year with a complete count. Recent-year momentum data for several leading assignees shows sharp year-on-year drops, though 2025-2026 figures will revise upward as publication catches up.
Claim density sits squarely in core conversion circuitry
H02M alone appears on 14.0% of records, more than three times the combined share of B60L, H03K and H01L. That concentration means core AC/DC and DC/DC converter claims face dense prior art, while adjacent classes like G05F and H05B carry comparatively thinner coverage.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to power conversion patent landscape, with the prior art for and against each one.
Who is filing, and where they are pulling back
The leaders in this dataset are large electronics and automotive manufacturers with long co-filing relationships, but recent-year filing counts for several of them have dropped sharply — a signal worth checking against each company's broader portfolio before drawing conclusions.
A single assignee leads by a wide margin
The top-ranked assignee holds 4,579 records, well ahead of fifth place at 1,859 and tenth place at 1,110 — a steep drop-off that flattens quickly across the rest of the ranked 100.
Corporate group filing shows up as co-assignee pairs
Ten co-assignee pairs appear in the data, with the strongest pair — a manufacturer and its industrial systems affiliate — sharing 36 records. These pairings typically reflect parent-subsidiary or joint-venture filing rather than open collaboration.
Several established filers show zero output in the latest year
More than one top assignee recorded zero filings in the latest year against a prior baseline, a -100% year-on-year change; others show declines of -74% to -95%. Publication lag means the latest year is always undercounted, so treat these as early signals rather than confirmed exits.
| Assignee | Recent year | YoY |
|---|---|---|
| Denso Corporation | 6 | -74% |
| Illinois Tool Works Inc. | 1 | -95% |
| Mitsubishi Electric Corporation | 0 | -100% |
| Hitachi, Ltd. | 0 | -100% |
| Toyota Motor Corporation | 0 | -100% |
| TMEIC (Toshiba Mitsubishi-Electric Industrial Systems Corporation) | 0 | — |
| General Electric Company | 0 | — |
| Fuji Electric Co., Ltd. | 0 | -100% |
Where to take this next
The dataset points to a field with recognisable leaders, a cooling filing trend, and classification gaps worth checking against a specific product or claim set.
Map a specific converter topology against the leaders
Filter the ranked assignees against a single sub-area — resonant conversion, bidirectional stages, or motor-drive control — to see whether the top-5 concentration holds at that finer grain.
Explore in EurekaCheck white-space claims before drafting
Run a claim draft in the under-claimed branches — G05F variable control or H05B drive circuits — against prior art to confirm the thinner coverage suggested by IPC share.
Search prior art in EurekaTrack momentum past the publication lag
Revisit 2025-2026 filing counts once publication catches up, since the current -40% three-year trend is measured only through 2024.
Set up monitoring in EurekaCommon questions about the power conversion patent landscape
The dataset ranks 100 companies by patent family count, led by a single assignee with 4,579 records, well ahead of fifth place at 1,859 and tenth at 1,110. The top five combined hold 12,671 records, 13.6% of all 93,079 records in scope, and the top ten hold 21.2%. That leaves most of the ranked field, and an unranked tail beyond it, holding comparatively small shares each, so the field has recognisable leaders but is not dominated by one or two firms.
Filing peaked at 1,274 records in 2019 and has declined since, falling 40% from 1,201 records in 2021 to 717 in 2024, the most recent year with a reliable count. Figures for 2025 and 2026 look lower still, but that is an artefact of publication lag — publication typically trails filing by about 18 months, so those years will revise upward as more records are indexed. Treat the 2021-2024 comparison as the reliable growth signal, not the raw numbers for the last one to two years.
H02M, the core power-conversion subclass covering AC/DC and DC/DC circuitry, appears on 14.0% of all 93,079 records, making it by far the densest classification in this field. The next most common classes are H02J, power supply and grid systems, at 4.0%, and H02P, motor and generator control, at 2.4%. Because a single record can carry several IPC codes, these shares add up to more than 100%, and a record concentrated in H02M is likely to face the thickest prior art in the dataset.
Relative to the 14.0% share carried by core H02M conversion claims, adjacent classes such as G05F variable control, H05B heating and lighting drive circuits, H03K pulse-technique logic, and H01L semiconductor-integrated stages each carry a share below 1.5% of records. That does not guarantee an open path — it means claim density is thinner there than in core converter topology, which is worth checking against a specific product design before assuming freedom to operate. A full clearance search against the specific claim language is still necessary.
US20250023486A1, filed by TDK Corporation and published 2025-01-16, describes a power conversion apparatus that pairs a transformer-isolated switching and rectifying circuit with a control circuit that sequences two alternating operations before power transfer. It illustrates a filing pattern visible across recent applications in this dataset: claims built around sequenced switching control and transformer-based isolation, rather than a converter topology claimed on its own. Anyone designing a similar two-stage, transformer-isolated converter should review this filing's specific control-sequencing language directly.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.