Power Conversion System for Storage Patents: Who Leads, Where Gaps Are 2026
- Concentration is modest. the top 5 assignees hold only 13.2% of the 1,072 records in scope, and the top 10 hold 21.4% — this field has not consolidated the way some adjacent storage categories have.
- Filings plateaued, not fell. 2021 to 2024 (the last complete year) moved from 92 to 90 filings, a -2% shift — essentially flat, not a decline in interest.
- Grid and conversion classes dominate the claim space. H02J appears on 65.4% of records and H02M on 21.3%, meaning most drafting activity sits on power-supply/grid architecture rather than pure conversion topology.
Filing growth compares 2021 (92 records) with 2024 (90) — 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 1,072 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Power conversion systems for storage sit at the junction of grid electronics, battery management and control software: the search scope here pulls together battery energy storage, bidirectional inverters and energy storage converters, filtered against operational concerns like DC bus voltage, round-trip efficiency, auxiliary consumption, insulation monitoring, cooling design and modular architecture. That combination captures the hardware and firmware layer that sits between a storage medium and the grid or load it serves, rather than the storage medium itself.
The 1,072 records in scope span 2015 through mid-2026, with the most recent year understated because publication typically lags filing by around 18 months. Filing activity across receiving offices skews heavily toward the United States and India, with meaningful volume also routed through the EPO, WIPO and China.
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Filing trends and technology composition
Two views of the same 1,072-record dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017–2026
Annual filings rose from 30 in 2017 to a peak of 119 in 2025, though 2025 and 2026 figures will keep revising upward as publications catch up. Treating 2021–2024 as the reliable window, volume held essentially flat: 92 filings in 2021 versus 90 in 2024, a -2% change — a plateau rather than a retreat.
IPC subclass composition
H02J (power supply and grid systems) appears on 65.4% of the 1,072 records, far ahead of H02M (power conversion, 21.3%) and H01M (batteries and cells, 16.8%). B60L (EV propulsion) reaches 15.5%, showing meaningful overlap with vehicle electrification, while G05B, G05F, H02P and G06F each sit under 7%, marking control-software and motor-control claims as a smaller but present slice. Because records can carry multiple classes, these shares sum past 100% and should be read against the 1,072-record total, not against each other.
Shares are the percentage of the 1,072 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Power Conversion System for Storage with Eureka
This page is one run against one query. Ask Eureka your own question about power conversion system for storage and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim on DC bus control
US20190372380A1 — Method and system for controlling DC bus voltage
A method for controlling a DC bus voltage in a DC bus system, the system including a DC bus and an energy storage unit coupled to the DC bus, includes: detecting a DC bus voltage; detecting, by the energy storage unit, a DC bus voltage of the DC bus; determining, by the energy storage unit, a power reference value based on the DC bus voltage; and adjusting, by the energy storage unit, one of output power and absorbing power based on the power reference value.Filed 2019-12-05. Illustrates the closed-loop DC bus regulation pattern that recurs across the dataset's H02J/H02M overlap.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6021052A | DC/AC power converter | 301 |
| 2 | US5907192A | Method and system for wind turbine braking | 277 |
| 3 | US20110276194A1 | System and method for energy management | 220 |
| 4 | US20120267952A1 | DC Micro-Grid | 218 |
| 5 | US20200298722A1 | Methods and systems for an integrated charging system for an electric vehicle | 209 |
| 6 | US20120268074A1 | Power system for high temperature applications with rechargeable energy storage | 193 |
| 7 | US20140304025A1 | Managing energy assets associated with transport operations | 192 |
| 8 | US20110100735A1 | Propulsion Energy Storage Control System and Method of Control | 192 |
| 9 | US20060076171A1 | Regenerative braking methods for a hybrid locomotive | 167 |
| 10 | US20140244082A1 | Hybrid electric vehicle | 148 |
Citation counts reflect influence within this searched corpus and favour older filings; they are not a measure of current commercial 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 a filing decision
Three read-outs from the dataset that matter more than the raw counts: how concentrated ownership actually is, where the volume growth stalled, and which classes carry the density.
Ownership is thin at the top
The leading assignee holds 32 records and the fifth-place holder 22 — respectable totals, but they combine for only 13.2% of the field. Extending to ten assignees adds up to just 21.4%. Neither figure supports treating this as a locked-down space; most of the corpus sits with entities outside the ranked leaders.
A plateau, not a slowdown
Filings moved from 92 in 2021 to 90 in 2024 — a -2% shift over the only three-year span that can be read as complete. 2025's provisional peak of 119 and 2026's early count of 46 will both revise upward as publication catches up, so neither should be read as an acceleration or a peak just yet.
Grid-system claims dominate the drafting
H02J's presence on 65.4% of the 1,072 records, against H02M's 21.3% and H01M's 16.8%, shows that most claim language frames the conversion hardware inside a grid-system context rather than as standalone topology. A filer drafting pure converter claims without a grid-interaction angle is working in a comparatively less crowded corner.
Filing routes concentrate in the US and India
The United States leads receiving offices with 368 filings, followed by India at 165, the EPO at 144 and WIPO at 130; China (71) and Australia (51) trail. A filer targeting only Europe or China without a US filing is missing where most of the activity in this dataset actually sits.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to power conversion system for storage, with the prior art for and against each one.
Who is filing, and how much room is left
A ranking of 100 companies sits behind this landscape, but the field is far from a closed shop: most of the 1,072 records belong to assignees outside the top ten.
A single leader without a dominant lead
The top assignee holds 32 of the 1,072 records — a real position, but not one that forecloses the field. Fifth place holds 22 and tenth place 16, a gentle taper rather than a cliff, which suggests the technology hasn't consolidated around a handful of dominant filers.
Most of the corpus sits outside the ranked leaders
With the top 10 combining for 21.4% of the 1,072 records, the large majority of filings belong to assignees further down the ranking or entirely outside it. That's consistent with a field still being explored by a wide mix of industrial, automotive and research entities rather than settled by a handful of incumbents.
Co-filing is rare and mostly internal
Only 8 co-assignee pairs appear across the dataset, and the strongest examples pair related entities under the same corporate umbrella rather than cross-company joint ventures. This is a field where companies are largely filing solo, which matters for anyone scouting for licensing or JV precedent.
| Assignee | Recent year | YoY |
|---|---|---|
| Indian Institute of Technology | 1 | — |
| General Electric Co | 0 | — |
| Johnson Controls Technology Co | 0 | — |
| Dynapower Company LLC | 0 | — |
| Cummins Power Generation IP Inc | 0 | — |
| CMBlu Energy AG | 0 | -100% |
| CPS Technology Holdings LLC | 0 | — |
| DEKA Products LP | 0 | — |
Where to take this analysis
The landscape points to where the crowding is and where it isn't. The next step is usually narrower: checking a specific claim scope, or watching a specific assignee's recent activity.
Check freedom-to-operate on a specific control scheme
If a candidate design touches DC bus voltage regulation or power-reference control, the most-cited records in this set are the first place to check for blocking claims before drafting continues.
Run a freedom-to-operate check in EurekaTrack the under-claimed sub-areas
Insulation-fault localisation and cooling-path design for modular converter stacks show lower filing density than the dominant H02J/H02M claim clusters — worth a closer look before committing to an architecture.
Explore white space in EurekaWatch assignee momentum, not just totals
Recent-year filing counts by assignee move faster than cumulative totals and can flag a competitor accelerating before it shows up in the overall ranking.
Set up assignee monitoring in EurekaCommon questions on this landscape
This dataset identifies 1,072 published records in scope, covering filings from 2015 through mid-2026. The scope combines battery energy storage, bidirectional inverter and energy storage converter terminology with operational concerns like DC bus voltage control, round-trip efficiency, auxiliary consumption, insulation monitoring, cooling design and modular architecture. Because publication lags filing by roughly 18 months, the most recent one to two years in this count will keep rising as more filings publish.
The ranking behind this landscape covers 100 companies, with the top-ranked assignee holding 32 of the 1,072 records and the fifth-ranked holder 22. Concentration is modest overall: the top 5 assignees combined account for only 13.2% of all records in scope, and the top 10 for 21.4%, meaning the large majority of filings sit with companies outside the most active filers. That pattern suggests the space is still open to new entrants rather than locked up by a small group of incumbents.
Filing counts rose from 30 in 2017 to a provisional peak of 119 in 2025, but the only span reliable enough to call a trend is 2021 to 2024, where filings moved from 92 to 90 — a -2% change, essentially flat. Later years (2025 and 2026) will revise upward as publications catch up, since patent publication typically lags filing by around 18 months. Reading those recent years as a slowdown would be a mistake; the honest read is a plateau in the confirmed data with genuine uncertainty in the newest years.
H02J (power supply and grid systems) is the dominant class, appearing on 65.4% of the 1,072 records, followed by H02M (power conversion circuitry) at 21.3% and H01M (batteries and cells) at 16.8%. B60L, covering electric vehicle propulsion, reaches 15.5%, reflecting overlap with EV charging and traction applications. Smaller but present classes — G05B, G05F, H02P and G06F — each sit under 7% and mark control-software and motor-control claim activity; note these shares sum past 100% because a single record can carry several IPC classes.
Sub-areas like insulation-fault localisation within modular converter strings, cooling-path design for stacked converter modules, and auxiliary-load power budgeting show comparatively lower filing density than the dominant DC-bus-control and grid-integration claim clusters. These sit at the edges of the H02J/H02M classes that otherwise carry most of the drafting activity in this dataset. A new entrant drafting in these areas is less likely to run into dense prior art than one filing directly on core bidirectional inverter topology.
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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.