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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/bidirectional-converters-for-storage-and-vehicles-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Power ElectronicsBidirectional Converter Patents for Storage and Vehicle Applications
- 59 filings from the leading assignee, yet the top 5 assignees combined hold only 11.6% of all 1,708 records in scope — a genuinely fragmented field, not a two-player race.
- Filings grew 59% from 2021 to 2024, climbing from 162 to 257 in the last full comparable year, with 2024 the highest filing year recorded so far.
- H02M power conversion appears in 68.1% of records, but B60L electric-vehicle propulsion classes turn up in barely more than a quarter of filings — a gap between converter topology work and vehicle-integration claims.
1,708
Published Records
12%
Top-5 Share of All Records
+59%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (162 records) with 2024 (257) — 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 1,708 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this patent set covers
This landscape tracks 1,708 patent records filed between 2015 and mid-2026 that combine bidirectional power-conversion terms — dual active bridge, onboard charger, power flow reversal — with functional claims around galvanic isolation, wide voltage range operation, phase-shift modulation or vehicle-to-grid power transfer. The scope spans both stationary storage converters and onboard vehicle chargers designed to move power in either direction between a DC bus, a battery and an AC grid or motor.
Because publication trails filing by roughly 18 months, the most recent one or two years in any trend line will understate real activity; treat 2025 and 2026 figures as still filling in rather than as a slowdown.
Filing activity, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Data
Filing trends and technology composition
The filing curve and the IPC breakdown below are drawn from the same 1,708-record set and use the denominators stated throughout this page.
A three-year run-up, not a plateau
Filings rose from 56 in 2017 to a peak of 257 in 2024, including a 59% jump between 2021 (162) and 2024 (257). Readings for 2025 and 2026 are still incomplete because of publication lag and should not be read as a decline.
Power conversion dominates; vehicle integration lags
H02M (power conversion) touches 68.1% of the 1,708 records and H02J (power supply and grid systems) 41.0%, confirming this is primarily converter-topology art. B60L (EV propulsion) appears in only 27.9% of records, and control-of-motor classes (H02P), magnetics (H01F) and battery-specific classes (H01M) each sit under 6% — evidence that most claims are written at the power-stage level rather than tied to a specific vehicle or storage system.
Shares are the percentage of the 1,708 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The most-cited prior art in this space
Representative Filing
Integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger
UNIVERSITY OF MARYLAND
An integrated and isolated onboard charger for plug-in electric vehicles combines an AC-DC converter with a dual-output DC-DC resonant converter serving both HV traction batteries and LV loads. The design can be configured as unidirectional or bidirectional, capable of delivering power from HV traction batteries back to the grid for V2G applications, and uses a single three-winding electromagnetically integrated transformer to raise power density.Filed by University of Maryland, published 2018-08-09 as US20180222333A1.
Highest-citation records
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110254377A1 | Wireless power transmission in electric vehicles | 695 |
| 2 | US20100198421A1 | Methods and Apparatus for Design and Control of Multi-port Power Electronic Interface for Renewable Energy So… | 232 |
| 3 | US20200298722A1 | Methods and systems for an integrated charging system for an electric vehicle | 209 |
| 4 | US20160016479A1 | An integrated dual-output grid-to-vehicle (G2V) and vehicle-to-grid (V2G) onboard charger for plug-in electri… | 207 |
| 5 | US20210155100A1 | Vehicle on-board charger for bi-directional charging of low/high voltage batteries | 183 |
| 6 | US20150365003A1 | Power Conversion System | 180 |
| 7 | US20120098344A1 | Photovoltaic units, methods of operating photovoltaic units and controllers therefor | 177 |
| 8 | US6118248A | Battery having a built-in controller to extend battery service run time | 176 |
| 9 | US20130057200A1 | Bidirectional inverter-charger | 171 |
| 10 | EP2249457A1 | PV solar cell | 157 |
Citation counts inside this corpus favour older filings and are a signal of influence, not of current relevance — a 2011 wireless-transmission filing leads the table simply because it has had longest to accumulate citations.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers tell a filing strategy
Three patterns stand out once the ranking, the trend and the IPC composition are read together.
Concentration
11.6%
of 1,708 records held by top 5
No single assignee controls the field
The leading assignee holds 59 records and the top 5 combined account for just 11.6% of the 1,708 records in scope. Even the tenth-ranked assignee sits at only 20 filings. That spread means freedom-to-operate analysis has to check a long list of holders rather than a handful of dominant portfolios.
Based on the 100-company assignee ranking returned for this dataset.
Momentum
+59%
growth 2021 → 2024
Activity accelerated into 2024, then the data thins
Filings climbed from 162 in 2021 to 257 in 2024, the highest year on record. The apparent drop after that reflects publication lag rather than falling interest, so 2025-2026 figures should be read as provisional.
2024 is the last year treated as complete in this dataset.
Composition
27.9%
of records touch B60L (EV propulsion)
Converter claims outnumber vehicle-integration claims
H02M and H02J together cover most of the corpus, but B60L appears in barely more than a quarter of records and H02P, H01F and H01M each sit under 6%. Claim writing has concentrated on the conversion stage itself rather than on how it couples to a specific battery chemistry or drivetrain.
Class shares are counted against the full 1,708-record total; a record may carry more than one class.
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Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to bidirectional converters for storage and vehicles, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gaps sit
The ranking behind this page returns 100 companies, from a leader at 59 filings down to single-digit entrants — read it as a wide field with a long tail, not a two-or-three-company race.
Leader
59
records, top assignee
A single leader well ahead of the pack
The top-ranked assignee's 59 records are roughly double the fifth-place total of 28, but that lead still represents a small fraction of the overall field. No assignee's recent-year momentum in this dataset shows sustained double-digit annual filing, which is consistent with a technology still being claimed incrementally rather than in a land-grab.
Momentum figures show most tracked assignees flat or declining in the latest partial year, in line with publication lag.
Mid-field
20
records, tenth place
A dense mid-tier rather than a sharp cliff
The gap between fifth place (28) and tenth place (20) is gradual, not a cliff, and the top 10 combined still only reach 18.1% of the 1,708 records in scope. That shape favours entrants who can carve out a specific sub-claim rather than compete head-on with the leader's broad portfolio.
Top 10 combined: 310 records, 18.1% of all records in scope.
Collaboration
10
co-assignee pairs identified
Co-filing is rare and concentrated in a few pairs
Only 10 co-assignee pairs appear across the dataset, with the strongest pairing appearing 13 times. Most filings in this space are single-assignee, so joint-development patent strategies remain the exception rather than the norm.
Strongest pair recorded 13 joint filings; most other pairs recorded 4.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Georgia Tech Research Corporation | 2 | +100% |
| Infineon Technologies Austria AG | 1 | -80% |
| Span IO Inc | 0 | -100% |
| The Regents of the University of California | 0 | — |
| General Electric Company | 0 | — |
| Huawei Digital Power Technologies Co., Ltd. | 0 | — |
| BorgWarner US Technologies LLC | 0 | -100% |
| Eltek Valere AS | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to a field that is still open at the edges even as the core converter topology art gets crowded.
Map claims against the under-claimed branches
Cross-reference specific claim language in the gate chips above against your own portfolio or target technology to see whether a filing has room to stand on a narrow, defensible claim rather than crowd the H02M core.
Explore in Patsnap EurekaTrack the mid-tier assignees, not just the leader
With the top 5 holding only 11.6% of records, competitive monitoring built around a single leader will miss most of the activity; the mid-tier of the ranking is where fast movers are more likely to surface first.
Set up assignee tracking in Patsnap EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about this landscape
The dataset ranks 100 assignees, with the leader holding 59 records out of 1,708 in scope. The field is fragmented rather than dominated: the top 5 assignees combined account for only 11.6% of all records, and the gap between fifth place (28 records) and tenth place (20 records) is gradual rather than sharp. Practically, this means competitive monitoring needs to cover a wide set of mid-tier filers, not just the single largest holder.
Filings grew from 162 in 2021 to a peak of 257 in 2024, a 59% increase over that span, making 2024 the highest filing year recorded in this dataset. Figures for 2025 and 2026 appear lower, but that reflects the roughly 18-month lag between filing and publication rather than a genuine drop in activity. Any read of a slowdown should wait until the most recent one to two years of filings have had time to publish.
H02M covers power conversion circuitry generally — the AC-DC and DC-DC stages that appear in 68.1% of the 1,708 records in scope — while B60L covers electric vehicle propulsion systems specifically, appearing in 27.9% of records. A filing can carry both classes if it claims a converter integrated into a vehicle drivetrain. The gap between the two shares suggests most claims in this field are written at the power-stage level and are not tied to a specific vehicle architecture.
IPC composition shows heavy density in H02M and H02J but comparatively light coverage in H01F (magnetics, 3.9%), H01M (battery-specific integration, 3.2%) and H02P (motor control, 5.3%). Sub-areas such as battery-chemistry-specific bidirectional charging, multi-port dual-active-bridge control and grid-synchronised V2G protection circuits show lower density relative to the core converter classes. These are reasonable starting points for narrowly drawn claims, though a full freedom-to-operate check against the mid-tier assignees is still needed before filing.
The most-cited record in this dataset is a 2011 filing on wireless power transmission in electric vehicles, cited 695 times, well ahead of the next most-cited record at 232 citations. Citation counts inside a searched corpus like this one favour older filings simply because they have had longer to accumulate citations, so high citation counts should be read as a signal of influence on the field rather than a measure of current commercial relevance.
Answers are grounded in the same dataset. Derived from a Patsnap search on Bidirectional Converters for Storage and Vehicles covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.