Power Factor Correction Circuit Patents: Top Companies & Trends 2026
- 23.6% concentration at the top. The five leading assignees hold 137 of the 581 records in scope, but the other 76.4% is spread across a long tail of single- and few-filing entrants.
- Filings have flattened since 2022. Activity peaked at 58 records in 2023 after climbing from 42 in 2017; the 2022 midpoint of 37 shows the field is no longer accelerating.
- Lighting-adjacent claims are a real secondary front. 10.8% of records also carry H05B (electric heating and lighting circuits), pointing to PFC work embedded in driver and ballast designs, not just standalone converters.
What this dataset covers
This landscape covers 581 published records filed between 2015 and mid-2026 that claim power factor correction circuitry — boost PFC converters, totem-pole bridgeless topologies, and control schemes addressing total harmonic distortion, critical conduction mode, hold-up time and light-load efficiency. The search combines title/abstract terms for the circuit topologies with classification codes in H02M (power conversion), H02J (power supply and grid systems) and H02J3, so the scope is deliberately narrow to circuit-level claims rather than the broader power electronics field.
Because publication typically lags filing by around 18 months, the most recent year in the trend is understated and should be read as a floor, not a ceiling. Family-level counting is used throughout so continuations and multi-jurisdiction refilings from the same invention are not double-counted.
Filing trend and technology composition
Two views of the same 581-record dataset: how filing volume has moved year over year, and which IPC subclasses the records sit in.
Filing trend, 2017–2026
Filings rose from 42 in 2017 to a peak of 58 in 2023, with the 2022 midpoint at 37 records. The trend since the peak is flat to declining, and 2026 figures (4 so far) are partial because of publication lag.
IPC subclass composition
H02M (power conversion) appears in 99.8% of the 581 records, confirming this is the anchor class for the search. H05B (10.8%) and G05F (7.7%) are the largest secondary classes, showing meaningful overlap with lighting-driver and variable-control circuitry; H02J, G01R, H03K, H02H and G06F each sit under 3%.
Shares are the percentage of the 581 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Power Factor Correction Circuits with Eureka
This page is one run against one query. Ask Eureka your own question about power factor correction circuits and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim in this space
US9899909B2 — Control device and method of totem-pole bridgeless PFC soft switch
Discloses a totem-pole bridgeless PFC circuit built from at least two parallel bridge arms between two connecting points, with a filter capacitor and load also in parallel, plus a soft-switch control method covering the switching behaviour of the arms and the PFC inductor.Filed by ZTE Corporation, published 2018-02-20. Chosen here as representative of the totem-pole bridgeless approach, one of the dominant topologies in the dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20040047166A1 | Power supply controller for exercise equipment drive motor | 108 |
| 2 | US6906503B2 | Power supply controller for exercise equipment drive motor | 107 |
| 3 | US8098505B1 | Phase management for interleaved power factor correction | 93 |
| 4 | US7595613B2 | Method and apparatus for electronic power control | 89 |
| 5 | US20070052397A1 | Method and apparatus for electronic power control | 83 |
| 6 | US20120014148A1 | Adaptive on-time control for power factor correction stage light load efficiency | 81 |
| 7 | US20060061337A1 | Power factor correction circuit | 80 |
| 8 | US20030095421A1 | Power factor correction circuit | 78 |
| 9 | US20080310201A1 | Digital Power Factor Correction | 74 |
| 10 | US20030052658A1 | Method and apparatus for electronic power control | 73 |
Citation counts are drawn from within the searched corpus and favour older filings; treat them as a signal of influence rather than current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers say about the field
Reading the concentration, trend and classification data together points to a field where the leadership tier is real but not dominant, and where growth has plateaued rather than continued.
A leader, not a monopoly
The leading assignee holds 45 records against a fifth-place figure of 16 and a tenth-place figure of 11 — a steep drop-off that leaves most of the field to companies filing in single digits.
Growth has stalled since the 2023 peak
Filings climbed steadily from 42 in 2017 to 58 in 2023, but the 2022 midpoint of 37 and the plateau since suggest the core topology space is now well-claimed rather than still opening up.
US and China lead receiving offices
United States filings (243) outnumber China (119) and EPO (89) by a wide margin, with WIPO PCT filings (40) indicating a meaningful share of applicants are still pursuing multi-jurisdiction protection.
Lighting-driver overlap is significant
Beyond the core H02M anchor class, H05B (lighting circuits) and G05F (variable control) are the two largest secondary classes, showing PFC claims are frequently embedded inside driver, ballast or variable-supply designs rather than filed as standalone converters.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to power factor correction circuits, with the prior art for and against each one.
Who is filing, and where the gate sits
The ranking covers 100 companies returned by the data endpoint — not a top-50 or top-100 cut, but the full ranked list for this scope. A handful of large filers sit above a long tail of single- and few-record entrants.
One clear leader by volume
The top-ranked assignee's 45 records are more than double the fifth-place figure of 16, marking a distinct gap between the single leader and the rest of the concentrated tier.
A shallow second tier
By tenth place, filing counts have dropped to 11 records — roughly a quarter of the leader's total — indicating the mid-tier is thin before the ranking flattens into the long tail.
Co-filing is limited and inventor-linked
Only ten co-assignee pairs appear in the dataset, and the strongest links are a single corporate assignee paired repeatedly with named individual inventors rather than joint filings between separate companies.
| Assignee | Recent year | YoY |
|---|---|---|
| Signify Holding B.V. | 0 | -100% |
| Huawei Digital Power Technologies Co., Ltd. | 0 | — |
| Infineon Technologies Austria AG | 0 | -100% |
| Huawei Technologies Co., Ltd. | 0 | — |
| Samsung Electronics Co., Ltd. | 0 | -100% |
| Texas Instruments Inc. | 0 | — |
| Delta Electronics, Inc. | 0 | -100% |
| LSI Industries Inc. | 0 | — |
Where to take this analysis
The dataset points to specific follow-up questions depending on whether the goal is freedom-to-operate, competitive tracking, or identifying open claim space.
Check freedom-to-operate on bridgeless topologies
Totem-pole bridgeless PFC and soft-switching control are recurring themes among the most-cited records; a claim chart against the leading assignees' portfolios is a reasonable next step before filing in this exact area.
Explore in EurekaTrack the plateau in filing volume
With filings flat since the 2023 peak, watch whether the next 12–18 months of publications (once the lag clears) show a genuine slowdown or a shift toward adjacent classes like H05B and G05F.
Explore in EurekaMap co-filing and inventor networks
The ten identified co-assignee pairs are thin but concentrated around named inventors at a single major filer; deeper inventor-network mapping could reveal where spin-outs or licensing activity is likely.
Explore in EurekaCommon questions about PFC circuit patents
Across the 581 records in this dataset, one assignee leads with 45 records, well ahead of the fifth-ranked company at 16. The top five assignees combined hold 137 records, which is 23.6% of all records in scope, meaning the leadership tier is real but the majority of filings still come from a long tail of smaller filers. This pattern — one clear leader, a shallow second tier, then a broad tail — is typical of a technology area with an established core topology but ongoing peripheral innovation.
Filing volume rose from 42 records in 2017 to a peak of 58 in 2023, but the 2022 midpoint of 37 and the plateau since the peak suggest growth has flattened rather than continued upward. The 2026 figure of 4 records is partial and should not be read as a drop-off, since publication typically lags filing by around 18 months. Overall the evidence points to a maturing rather than an expanding filing environment.
US9899909B2, assigned to ZTE Corporation and published in February 2018, claims a totem-pole bridgeless PFC circuit with at least two parallel bridge arms between two connecting points, a filter capacitor and load in parallel, at least one PFC inductor, and a soft-switch control method governing the switching behaviour of the arms. It is representative of the bridgeless topology approach that recurs among the most-cited records in this dataset. Anyone designing a totem-pole bridgeless PFC stage with comparable soft-switching control should review this claim scope directly rather than relying on a summary.
The secondary IPC classes point to under-claimed overlap areas rather than the core H02M converter topologies, which are densely filed. Lighting-driver integration (H05B, 10.8% of records) and variable-control circuitry (G05F, 7.7%) show meaningful but not saturated overlap with PFC claims, and light-load efficiency and hold-up time extension circuits appear more often as secondary features than as dedicated claim clusters. A first claim in these areas would likely combine a PFC stage limitation with a specific lighting-driver or variable-control function rather than claiming a new base topology.
The United States leads as a receiving office with 243 filings, followed by China at 119 and the European Patent Office at 89. WIPO PCT filings account for 40 records, indicating a meaningful share of applicants pursue multi-jurisdiction protection from the outset, while Taiwan (16) and India (13) are smaller but active receiving offices. This distribution suggests the US and China are the primary competitive battlegrounds for this technology.
Research Power Factor Correction Circuits in depth with Eureka
Go past this page: query the whole power factor correction circuits corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.