String Inverter Miniaturization Patents: Leaders & Trends 2026
- Filing peaked in 2022 at 43 families and has not been matched since — the field is past its filing peak rather than still accelerating.
- IPC spread runs across eight subclasses from power conversion (H02M) into aircraft equipment (B64D/B64F/B64C), showing miniaturized power-stage claims migrating into airborne electric propulsion.
- United States receives 99 of 154 filings versus 28 at WIPO and 16 at the EPO, so the contest for this claim space is concentrated in one jurisdiction.
Filing growth compares 2021 (40 records) with 2024 (15) — 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 154 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent families that combine string-inverter or PV/solar-inverter terminology with compact-design language such as high power density, compact inverter design and integrated power stage. The 154 families span 2015 through the 2026 cut-off and describe the drive to pack more conversion capacity into smaller, lighter enclosures — a requirement shared by rooftop solar, grid-tied storage and, increasingly, electric aircraft propulsion.
Because publication lags filing by roughly eighteen months, the last one to two years in any trend chart understates real filing activity; treat the most recent bars as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 154 families: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filings rose to a 2022 peak, then eased
Volume climbed from 11 families in 2017 to a peak of 43 in 2022, the midpoint of the tracked window. Filings since have not exceeded that peak, consistent with a technology area that reached a first wave of claim-staking and is now consolidating rather than expanding.
Power conversion claims sit alongside aircraft and EV codes
B60L (electric vehicle propulsion) and H02J (power supply and grid systems) each outrank H02M (power conversion proper) in record count, and B64F/B64D/B64C together account for a large share of the corpus — evidence that compact string-inverter power-stage techniques are being claimed for airborne and vehicle platforms as much as for rooftop solar.
Shares are the percentage of the 154 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on String Inverter Miniaturization and Integration with Eureka
This page is one run against one query. Ask Eureka your own question about string inverter miniaturization and integration and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art and a representative filing
US10812014B1 — Modular photovoltaic string inverter system adapted for SiC MOSFETs
Discloses inverter circuit configurations built around a ground-balancing converter module coupled between a pair of inverter input terminals and ground, feeding a plurality of converter modules that each output an ac phase. The design targets increased device lifetime for SiC MOSFET-based string inverters through modular voltage control.Filed by The Regents of the University of Colorado, published 2020-10-20.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180205242A1 | Capacitor based power system and unmanned vehicle with the capacitor based power system thereof | 68 |
| 2 | US20170237271A1 | Energy storage cell, capacitive energy storage module, and capacitive energy storage system | 35 |
| 3 | US20170236648A1 | Grid capacitive power storage system | 30 |
| 4 | US20230192063A1 | Integrated power system and method for energy management for electric vehicle | 22 |
| 5 | US11605964B1 | Charging connector control system and method for charging an electric vehicle | 17 |
| 6 | US11485517B1 | System and method for communicating a pre-charging package stream of an electric aircraft | 16 |
| 7 | US20190245433A1 | Water-cooling power supply module | 16 |
| 8 | US11447030B1 | Methods and systems for authentication of an electric aircraft for recharging | 14 |
| 9 | US20230170732A1 | Modular power pack energy storage unit | 13 |
| 10 | US20200052604A1 | Multi-input single-resonant tank LLC converter | 13 |
Citation counts reward older filings that have had more time to accumulate citations inside this corpus; read them as a signal of influence on later filers, not as a ranking of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the trend, the IPC spread and the citation table.
The first claim wave has passed
Volume grew roughly fourfold from 2017 to the 2022 peak but has not exceeded it since. New entrants now compete against an established base of claims rather than an open field, which raises the bar for a clean novel filing in the core power-stage architecture.
Power-stage claims are migrating to vehicles and aircraft
More families sit in B60L (EV propulsion) than in H02M (power conversion), and B64F, B64D and B64C together add 84 more records. Compact inverter architectures developed for solar strings are being re-claimed for onboard vehicle and aircraft power systems.
The contest is concentrated in the US
With 99 US filings against 28 PCT and 16 EPO filings, freedom-to-operate work in Europe or under PCT national phase currently faces a thinner prior-art wall than a US filing does — though that gap will narrow as PCT applications enter national phase.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to string inverter miniaturization and integration, with the prior art for and against each one.
Who is filing, and where the field is still open
Assignee activity in this corpus is led by university research groups and specialist power-electronics firms rather than the largest global inverter manufacturers, with recent-year momentum flat across the most active names tracked.
University research feeds a commercial partner
The strongest co-assignee link in the dataset pairs a university engineering group with a specialist power-electronics company across six shared families, the clearest sign of a lab-to-product pipeline in this corpus.
Momentum has cooled across tracked assignees
Every assignee tracked for recent-year momentum, including university bodies and named technology firms, shows zero filings in the latest tracked year — consistent with the corpus-wide plateau after the 2022 peak rather than any single firm's retreat.
No single filer dominates the ranking
The assignee ranking spans university bodies, a named aviation-electric entrant, and both a Chinese digital-energy unit and its parent group, alongside smaller specialist firms — a fragmented field rather than one led by a handful of large inverter OEMs.
| Assignee | Recent year | YoY |
|---|---|---|
| Beta Air, LLC | 0 | — |
| SUSTAINABLE ENERGY TECHNOLOGIES INC | 0 | — |
| Coalescent Sciences LLC | 0 | — |
| The Regents of the University of Colorado | 0 | — |
| Huawei Digital Power Technologies Co., Ltd. | 0 | — |
| Huawei Technologies Co., Ltd. | 0 | — |
| BREK ELECTRONICS INC | 0 | — |
| Wayne State University | 0 | — |
Where to take this next
The landscape points to two practical next steps for a team deciding where to file or where to watch.
Check freedom-to-operate against the citation leaders
The most-cited records in this corpus, several from capacitor-based energy storage and power-system filings, sit upstream of much later work. Any new compact power-stage filing should be checked against these before drafting claims.
Explore the citation networkWatch the aircraft and EV migration
With B60L and B64-series aircraft codes now outnumbering core H02M power-conversion records, the more active claim contest may be in mobility and airborne platforms rather than rooftop solar.
Track cross-domain filingsCommon questions on string inverter miniaturization patents
In this dataset it is a patent family whose title, abstract or claims combine string-inverter or solar-inverter terminology with compact-design language such as high power density, compact inverter design or integrated power stage. That combination captures work on reducing enclosure size, raising power density per unit volume, and integrating separate conversion stages into a single module. It excludes general solar-inverter patents that do not address size, density or integration directly.
The corpus is led by a mix of university research groups and specialist power-electronics firms rather than the largest global inverter brands, with a notable university-industry co-filing pair sharing six families. No single assignee dominates the 154-family ranking, and recent-year filing counts are flat across the most active names tracked, which suggests the field has not consolidated around one leader.
No — filings rose from 11 families in 2017 to a peak of 43 in 2022, and volume has not exceeded that peak since. Because publication lags filing by roughly eighteen months, the most recent one to two years will always look lower than they eventually turn out to be, but the trend through the peak already shows deceleration rather than continued acceleration.
The IPC composition shows 84 families in B60L (electric vehicle propulsion) and a combined 84 across B64F, B64D and B64C (aircraft equipment and installations), alongside 42 in H02M (power conversion proper). This indicates that compact, high-density power-stage architectures first developed for solar string inverters are being re-claimed for onboard vehicle and airborne electric propulsion systems, where size and weight constraints are even tighter.
Sub-areas with comparatively thin filing density inside this corpus include connector-integrated power stages, SiC/GaN device-level thermal packaging, ground-balancing converter topologies, battery-integrated string inverter modules, and airborne power-stage certification claims. These sit adjacent to the dense core H02M and B60L filings but are not yet heavily claimed on their own, making them worth a closer freedom-to-operate check before assuming the space is closed.
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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.