Onboard Charger Patents: Who Leads, Where the Gaps Are 2026
- 19 families total. This is a narrow filing field — peak activity was 5 families in 2021, and the 2022 midpoint shows no growth since.
- One family line dominates citations. The Maryland-originated G2V/V2G integrated onboard charger lineage (US20160016479A1 through US10696182B2) accounts for the heaviest cited weight in the set, with 207 citations on the earliest publication alone.
- H02M carries the claim load. 16 of 19 records sit in power conversion (H02M), with H01F magnetics integration a distant second at 8 — leaving B60L, G05F, H02J and H05K each thinly claimed.
Filing growth compares 2021 (5 records) with 2024 (2) — 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 19 records in scope (CR5), not by the ranked leaders only.
A small dataset with an outsized prior-art anchor
Onboard charger miniaturization and integration covers the electronics that convert grid AC to battery-ready DC inside the vehicle, with the specific engineering push toward higher power density through combined magnetic components and dual-output topologies. The search set behind this page returns 19 published patent families across 2015-2026, which is a small field by EV-systems standards — small enough that a handful of related filings from one research origin shape the citation landscape disproportionately.
Filing activity peaked at 5 families in 2021 and shows no filings recorded at the 2022 midpoint, consistent with either a real slowdown or the normal 18-month lag between filing and publication understating the most recent years. Because there are only 19 families in total, rankings and trend lines here should be read as directional signals rather than statistically robust market shares.
Filing trend and technology composition
Two views of the same 19 families: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend is flat, not rising
From a zero baseline in 2017, filings rose to a peak of 5 in 2021 before falling back to zero at the 2022 midpoint and through the most recent recorded year. Read the tail end cautiously: publication lag of roughly 18 months means 2025-2026 filings are likely undercounted rather than genuinely absent, but the multi-year plateau before that is a real signal of a mature, low-volume niche rather than an expanding one.
Power conversion dominates; adjacent subclasses are thin
H02M (power conversion) appears in 16 of 19 records, confirming that most claims center on the AC-DC and DC-DC conversion stage itself. H01F (magnetics and transformers) follows at 8, reflecting the integrated-magnetics angle specific to this search. B60L (EV propulsion), G05F (variable control), H02J (power supply/grid) and H05K (printed circuit assemblies) each register in the single digits, marking them as areas where the vehicle-system and control-layer integration of the charger is comparatively under-claimed relative to the conversion electronics itself.
Shares are the percentage of the 19 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Onboard Charger Miniaturization and Integration with Eureka
This page is one run against one query. Ask Eureka your own question about onboard charger miniaturization and integration and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited family anchors this field
Integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electric vehicles
An integrated and isolated onboard charger for plug-in electric vehicles, comprising an AC-DC converter and a dual-output DC-DC resonant converter, serving both HV traction batteries and LV loads. The charger can be configured as unidirectional or bidirectional, delivering power from HV traction batteries back to the grid for V2G applications. To raise power density, the dual-output DC-DC resonant converter combines the magnetic components of its resonant networks into a single three-winding electromagnetically integrated transformer (EMIT), with the resonant converter configured in a half-bridge topology.Filed by University of Maryland; published 2018-08-09.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160016479A1 | An integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electri… | 207 |
| 2 | US20180222333A1 | Integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electric v… | 154 |
| 3 | US9931951B2 | Integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electric v… | 41 |
| 4 | WO2015192133A2 | An integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electri… | 22 |
| 5 | US10696182B2 | Integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electric v… | 19 |
| 6 | US11211872B1 | Power-factor-correction rectifiers with soft switching | 11 |
| 7 | TW202213919A | Power-factor-correction rectifier | 3 |
| 8 | JP2023036968A | 昇圧整流器 | 2 |
| 9 | WO2015192133A9 | An integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electri… | 1 |
Citation counts inside a searched corpus favor older publications; treat this as a signal of influence on later filers, not of current commercial dominance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Publication numbers are shown where the record carries one (9 of 9 rows); clicking a row searches Eureka by that number.
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Three findings that shape how a freedom-to-operate or whitespace review of this niche should be scoped.
Claims cluster on the conversion stage, not the vehicle system
Power conversion (H02M) accounts for the large majority of records, meaning most patent effort has gone into the AC-DC/DC-DC topology itself rather than how the charger integrates with vehicle-level control or thermal systems.
One lineage anchors the prior-art landscape
The earliest publication in the dual-output G2V/V2G integrated charger family (US20160016479A1) carries 207 citations, far ahead of the next entries in the same lineage, indicating it is the reference point later filers had to design around.
Activity has plateaued rather than accelerated
Filings rose to 5 in the peak year of 2021 and the 2022 midpoint shows none, with recent-year momentum by assignee also flat at zero for the most active organizations in the set. This is a quiet field for new activity rather than a growing one, subject to normal publication-lag caveats for the very latest years.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to onboard charger miniaturization and integration, with the prior art for and against each one.
A field led by university and research-institute filers
Assignee activity in this dataset skews toward university and applied-research origins rather than large-volume automotive OEMs, consistent with a niche still centered on core topology innovation.
University of Maryland anchors the most-cited lineage
The dual-output G2V/V2G integrated onboard charger family traces to University of Maryland and carries the heaviest citation weight in the dataset, but shows no filing activity in the latest recorded year.
Delta Electronics holds a presence without recent renewal
Delta Electronics appears among the assignees in this space but, like the other named organizations, shows no filings in the most recent year tracked, suggesting the industrial side of this niche has also gone quiet for now.
University of Alberta shows the sharpest year-over-year drop
Among the tracked assignees, the University of Alberta Board of Governors registers a -100% year-over-year change alongside zero filings in the latest year, the steepest pullback of the group.
| Assignee | Recent year | YoY |
|---|---|---|
| University of Maryland | 0 | — |
| Delta Electronics, Inc. | 0 | — |
| The Governors of the University of Alberta | 0 | -100% |
| KU Leuven Research & Development | 0 | — |
| Virginia Tech Intellectual Properties, Inc. | 0 | — |
| TATA AUTOCOMP SYST LTD TECH CENT | 0 | — |
| INDIAN INST OF TECH JAMMU | 0 | -100% |
Where to take this analysis
This landscape flags the concentration and the gaps; the next step is testing specific claim language against the full family set.
Run a freedom-to-operate check on the top-cited family
Before drafting claims on integrated magnetics or dual-output resonant topologies, check independent claim scope across the full G2V/V2G onboard charger family, not just the most-cited publication.
Explore in Patsnap EurekaDraft against the under-claimed branches
The thin coverage in B60L, G05F and H05K suggests room for claims on vehicle-system integration, control logic and packaging rather than the conversion stage itself.
Explore in Patsnap EurekaCommon questions on this landscape
This dataset identifies 19 published patent families matching the onboard charger miniaturization and integration search criteria across 2015-2026. That makes it a narrow, specialized field compared to broader EV powertrain categories. Because families rather than raw documents are counted, this figure already accounts for continuations and multi-jurisdiction filings of the same invention, so it is a fairer measure of distinct inventions than a raw document count would be.
The most-cited lineage in this dataset traces to University of Maryland, whose dual-output grid-to-vehicle and vehicle-to-grid onboard charger family carries the heaviest citation weight of any record tracked. Other assignees in the set include Delta Electronics, University of Alberta, KU Leuven's research and development office, and Virginia Tech's intellectual property arm. None of the tracked assignees show filing activity in the most recent year, so leadership here reflects historical influence more than current output.
Filings in this dataset peaked at 5 families in 2021 and the 2022 midpoint shows none recorded, with recent-year momentum flat across the leading assignees. Part of this apparent slowdown is a publication-lag artifact: patents typically publish about 18 months after filing, so the last one to two years in any trend chart understate true activity. Even allowing for that lag, however, the multi-year plateau before the most recent years points to a genuinely quiet period of new claim activity rather than a data gap alone.
In this dataset, H02M (power conversion, covering AC-DC and DC-DC conversion) accounts for 16 of 19 records, making it the dominant classification. H01F (magnets, inductors and transformers) follows at 8 records, reflecting the integrated-magnetics focus of the underlying search. B60L (EV propulsion), G05F (variable control), H02J (power supply and grid systems) and H05K (printed circuits and assemblies) each appear only once or a handful of times, marking them as adjacent but thinly claimed areas.
US20180222333A1, assigned to University of Maryland and published 2018-08-09, describes an integrated and isolated onboard charger combining an AC-DC converter with a dual-output DC-DC resonant converter serving both high-voltage traction batteries and low-voltage loads. Its key technical contribution is combining the magnetic components of the resonant networks into a single three-winding electromagnetically integrated transformer to raise power density, with support for bidirectional vehicle-to-grid operation. It sits within the most heavily cited family in this dataset, making it a reference point that later filers in integrated onboard charger design need to review closely before claiming similar magnetics-combining approaches.
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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.