SiC Traction Inverters Patents: Who Leads, Where the Gaps Are 2026
- One filer holds 9 of 33 records, and the top five assignees together account for 66.7% of all 33 records in scope — a field concentrated at the top with a long tail below it.
- Filing peaked in 2022 at 9 records, and the trend since is flat to declining rather than accelerating, though the most recent year is always understated by publication lag.
- Thermal management dominates the cited record, with the most-cited document a coolant-flow temperature controller for traction inverters — a sign that thermal claims, not switching topology, are the most fought-over ground.
What this landscape covers
This dataset tracks 33 published records matching SiC traction inverter terminology combined with power-module packaging, EMI, switching-frequency and cost-per-kilowatt language, restricted to power-conversion, semiconductor-packaging and EV-propulsion IPC classes. The scope runs from 2015 through the 2026-07-31 data cut-off, so it captures both automotive OEM filings and adjacent rail-traction work that shares the same power-electronics claim language.
Because publication lags filing by roughly 18 months, the most recent filing year in the trend line always understates real activity — treat the last one to two years as a floor, not a ceiling. Family-level counts, used throughout this ranking, are the fairer unit than raw document counts because they neutralise multi-jurisdiction filing and continuation strategies from any single applicant.
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Filing trend and technology composition
Two views of the same 33 records: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend: a flat-to-declining curve after 2022
Filings rose from zero in 2017 to a peak of 9 records in 2022, the midpoint of the trend. Activity since has not exceeded that peak, which reads as flat-to-declining rather than a growth curve — though the final year or two is understated by publication lag and should not be read as a real drop-off yet.
IPC composition: power conversion and EV propulsion dominate
Power conversion (H02M) and EV propulsion (B60L) each cover roughly two-thirds of the 33 records (66.7% and 63.6% respectively), confirming this is fundamentally a power-electronics-for-EVs corpus. Motor control (H02P, 30.3%) and circuit assembly (H05K, 27.3%) sit well behind as secondary claim clusters, with rail traction (B61C, 15.2%) and thermal/grid classes (B60H, H02J, H02K, each 12.1%) forming a thinner supporting layer. Because records can carry several classes, these shares sum to more than 100% of the 33 records.
Shares are the percentage of the 33 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on SiC Traction Inverters with Eureka
This page is one run against one query. Ask Eureka your own question about sic traction inverters and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Vehicular traction inverter temperature control system (US20190223330A1)
A vehicular system includes a pump, configured to circulate coolant for a traction inverter, and a controller. The controller may be configured to, responsive to each of a temperature of the traction inverter falling outside a first range or a requested flow rate of the pump falling outside a second range, operate the pump at a predefined speed, otherwise, operate the pump at a speed based on a difference between the temperature and a temperature associated with the coolant.Filed by Ford Global Technologies, LLC; the most-cited record in this corpus at 19 citations.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20190223330A1 | Vehicular traction inverter temperature control system | 19 |
| 2 | US20230249520A1 | Selective efficiency traction inverters and chargers as heat sources for thermal conditioning of electric veh… | 15 |
| 3 | CN102694480A | 跨座式单轨列车牵引变流器 | 13 |
| 4 | US20210078446A1 | Integrated traction inverter DC busbar | 10 |
| 5 | US20150138734A1 | 360 degree direct cooled power module | 8 |
| 6 | US11766920B2 | Selective efficiency traction inverters and chargers as heat sources for thermal conditioning of electric veh… | 7 |
| 7 | CN202798517U | 跨座式单轨列车牵引变流器 | 7 |
| 8 | US11267366B2 | Integrated traction inverter DC busbar | 5 |
| 9 | US10757843B2 | Vehicular traction inverter temperature control system | 3 |
| 10 | CN102229339A | 微功耗列车牵引交流传动系统 | 3 |
Citation counts favour older filings simply because they have had more time to accumulate citations within this searched corpus — read them as a signal of influence on later filers, not as a measure of current technical importance.
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. 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 same 33-record corpus: how concentrated ownership is, where the claim volume sits technically, and what the citation record signals.
Ownership sits with a small group, not a single monopolist
The top five assignees together hold 22 of the 33 records in scope, and the top ten extend that to 29 records (87.9%). That leaves a genuine long tail of single- or double-filing entrants below the ranked leaders, rather than one company controlling the field outright.
Power conversion and EV propulsion claims overlap heavily
Two-thirds of records touch power conversion (H02M) and nearly two-thirds touch EV propulsion (B60L), meaning most filers are claiming the inverter as an integrated vehicle subsystem rather than a standalone power component. Motor control and circuit-assembly classes trail well behind.
Activity has not grown past its 2022 peak
The filing count climbed from zero in 2017 to 9 in 2022 and has not exceeded that level since. Combined with the roughly 18-month publication lag, the most recent one to two years should be read as incomplete rather than as evidence the field has cooled.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sic traction inverters, with the prior art for and against each one.
Who is filing, and where the claim space is still open
The ranked leader holds 9 of the 33 records; fifth place holds 2 and tenth place holds 1 — a steep drop-off that leaves most of the ranked list as single- or double-digit filers.
One automotive OEM sets the pace
The leading assignee's 9 records is more than four times the fifth-place count of 2, indicating a sustained, multi-year filing programme rather than a single opportunistic burst.
A cluster of moderate filers below the leader
Places two through five sit in the low single digits, spanning automotive, rail-traction and component-supplier applicants rather than one industry segment.
Most of the ranked list files once or twice
From sixth place down, filers hold only one or two records each, consistent with a field where entry is still open to new applicants rather than locked up by an incumbent group.
| Assignee | Recent year | YoY |
|---|---|---|
| Ford Global Technologies, LLC | 0 | -100% |
| RANCHO DEL I P | 0 | — |
| MATTER MOTOR WORKS PTE LTD | 0 | — |
| Neapco Intellectual Property Holdings, LLC | 0 | — |
| Yu Baichao | 0 | — |
| Volvo Car Corporation | 0 | — |
| CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd. | 0 | — |
| Magna Electronics Inc. | 0 | — |
Where to take this analysis
The dataset points to a field with a clear leader, a genuine long tail, and thermal/packaging claims that are more contested than switching-topology claims.
Check freedom-to-operate on thermal control claims
The most-cited record in this corpus is a coolant-flow temperature controller, not a switching-frequency or topology patent. Any inverter design with active thermal management should be checked against this claim family specifically.
Explore this landscape in EurekaWatch the mid-field for consolidation signals
With most ranked assignees holding one or two records, a shift in filing pace from any of them would be an early signal of a new entrant scaling up rather than noise.
Track assignee activity in EurekaRevisit the trend line once later years fill in
Because publication lag understates the most recent one to two years, the apparent flattening after 2022 should be re-checked against this same corpus in a future pull before drawing conclusions about market cooling.
Re-run this search in EurekaCommon questions about SiC traction inverter patents
Within this 33-record corpus, one assignee leads with 9 records, well ahead of the fifth-ranked filer at 2 records. The ranking covers 14 companies in total, and the top five together hold 66.7% of all records in scope, so ownership is concentrated but not monopolised by a single company. Below the top ten, most assignees hold only one or two records each, indicating room for new entrants to establish position.
Filing activity peaked in 2022 at 9 records and has not exceeded that level since, which reads as flat to declining rather than growing. However, publication typically lags filing by roughly 18 months, so the most recent one to two years in any such trend are understated and should not yet be read as a genuine slowdown. A re-check against a later data pull is the safer way to confirm the direction.
The two largest classes are H02M (power conversion, covering 66.7% of the 33 records) and B60L (electric vehicle propulsion, 63.6%), reflecting that most filings treat the inverter as an integrated vehicle power system rather than a standalone component. Motor control (H02P) and circuit assembly (H05K) form a secondary layer, while rail traction, vehicle thermal management and grid-power classes appear in a smaller share of records. Because a single record can carry several IPC classes, these shares add up to more than 100% of the record total.
US20190223330A1 is a Ford Global Technologies filing for a vehicular traction inverter temperature control system: it claims a pump that circulates coolant for the inverter, controlled so that the pump runs at a predefined speed when the inverter's temperature or the requested flow rate falls outside set ranges, and otherwise runs at a speed based on the gap between inverter temperature and coolant temperature. It is the most-cited record in this corpus at 19 citations. Anyone designing active coolant-flow control tied to inverter temperature thresholds should review this claim family specifically rather than assuming switching-topology patents are the only relevant prior art.
The thinner classes in this corpus, such as vehicle heating/air-conditioning integration (B60H), grid-power interfaces (H02J) and standalone motor/generator hardware (H02K), each cover only about 12.1% of the 33 records, well below the power-conversion and propulsion core. Sub-areas like double-sided SiC module cooling, busbar-integrated thermal paths and rail-traction adaptations of automotive SiC converters show visibly lower claim density than the core switching and propulsion classes. These are reasonable areas to scout before assuming the space is closed, though low volume in a 33-record corpus also means conclusions here should be treated as directional rather than definitive.
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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.