A Fragmented Standards Landscape at an Inflection Point

Four major EV fast charging connector standards are simultaneously active in global markets in 2026: CCS1/CCS2 (North America and Europe), CHAdeMO (Japan), GB/T (China), and the emerging ChaoJi interface. This multi-standard coexistence is the defining IP risk of the field — every connector hardware design, control pilot circuit, and adapter compatibility claim sits inside a standards boundary that is still shifting. Analysis of 70+ patent and literature records spanning 2010–2024 confirms that standards harmonisation has been the gating concern for EV deployment since at least 2010, when research from Erasmus University College Brussels identified compatible connector standards as the primary barrier to infrastructure rollout.

The ChaoJi standard represents the most significant attempt at convergence. Developed to reconcile CHAdeMO 2.0 (Japan), GB/T (China), and CCS1/CCS2 (US/Europe), ChaoJi revises the control pilot circuit architecture — the low-voltage signalling line governing charge authorisation, current capacity negotiation, and state transitions — to eliminate identified safety and compatibility defects present in existing systems. Critically, ChaoJi’s adapter design enables backwards compatibility with CHAdeMO and CCS vehicles already in the field, which is the prerequisite for any standard to achieve real-world consolidation. Research from State Grid Electric Power Research Institute (Nanjing, 2022) documents the full control pilot circuit design and verification methodology behind this backwards-compatibility claim.

Power levels across the active standards range from 50 kW (legacy DC fast charging) through 150–350 kW (high-power fast charging) toward 350–1,000 kW targets for extreme fast charging (XFC). The XFC range is where standards battles have the highest commercial stakes: a charge time of 5–10 minutes — competitive with conventional refuelling — requires not only a new connector and pilot circuit, but a fundamentally different power electronics architecture and grid connection strategy. According to ISO and IEC standardisation bodies, the physical interface specification and the communication protocol must be co-developed to achieve interoperability at these power levels.

Power Electronics for Extreme Fast Charging: The SST Architecture

Achieving XFC at 350 kW and above requires a multi-stage power conversion architecture that differs fundamentally from conventional charging station designs. The core innovation is the solid-state transformer (SST), which enables direct medium-voltage grid connection — bypassing the conventional low-voltage distribution network entirely — while providing galvanic isolation and DC/DC regulation in a single power stage. Research from the University of Ontario Institute of Technology (2019) presents SST-based medium-voltage direct connection as the primary architecture for XFC, and Clemson University (2021) identifies the topology gaps and DC power network requirements that must be resolved before commercial deployment.

“Ultra-fast charging targeting the 350 kW+ range would compress charge times to 5–10 minutes — competitive with conventional refuelling — but requires solid-state transformer architectures capable of direct medium-voltage grid connection.”

The engineering challenge is achieving greater than 95% efficiency at these power levels while simultaneously maintaining unity power factor at the grid interface and managing battery-side current profiles that do not accelerate lithium-ion degradation. Baylor University’s 2019 review of advanced fast-charging technologies identifies converter topologies and thermal management as the binding constraints. At 350 kW continuous throughput, thermal dissipation in the converter alone represents a significant engineering problem — one that has not yet produced a dominant commercial patent cluster in the analysed dataset.

Among retrieved results, SST-based XFC architectures are described primarily at the conceptual and review level by North American academic groups. Commercial entities have not yet produced a dominant patent cluster around these topologies in this dataset, according to the PatSnap analysis — a signal that this sub-domain represents an open IP opportunity. Standards bodies including IEC and IEEE are actively developing the grid interconnection and power quality specifications that will frame the commercial IP landscape for SST-based XFC.

The Three-Phase Innovation Timeline

The 14-year span of records in this dataset (2010–2024) resolves into three distinct phases. The foundational phase (2010–2016) was dominated by standards harmonisation concerns and infrastructure planning. The development phase (2017–2020) saw power electronics topologies, Level 2 and DC fast charging architectures, and early V2G studies proliferate. The maturation and convergence phase (2021–2024) — the most active cluster, with more than 30 records — covers multi-standard interoperability, V2X bidirectional interfaces, IoT and 5G-enabled smart charging, and dynamic wireless charging for highways.

The Communication Layer: ISO 15118, Plug & Charge, and the New Patent Battleground

The charging interface in 2026 is increasingly defined by its communication layer rather than its physical connector. The sequence of messages, authentication tokens, and power negotiation parameters exchanged between the EVCC (Electric Vehicle Communication Controller, on-vehicle) and the SECC (Supply Equipment Communication Controller, station-side) determines session initiation speed, security, and bidirectional capability. ISO 15118 defines the Plug & Charge (PnC) framework that enables automated vehicle identification without payment card interaction — and WLAN-based extensions to this standard reduce discovery latency relative to power line communication (PLC) approaches.

The 2024 Hyundai patent is particularly significant because it collapses two previously separate engineering problems — physical positioning of the vehicle relative to the charging inlet, and session-layer communication establishment — into a single coordinated protocol. This dual-technology architecture anticipates the needs of connected and automated vehicles (CAVs) that must dock autonomously without human guidance. SAP SE’s active EP patent (2021) addresses a complementary layer: schedule-aware power constraint assignment to charging points based on vehicle power characteristics, representing the software-defined infrastructure control logic that sits above the physical and session layers.

Physical connector standards are approaching consolidation, but the ISO 15118 / WLAN-based SECC discovery and Plug & Charge authentication stacks remain actively contested territory. According to WIPO patent filing trends, communication protocol patents in the EV charging domain have grown substantially since 2020 — reflecting the industry’s recognition that the software-defined session layer is where differentiation will be won or lost as hardware standards converge. Other OEMs and Tier 1 suppliers should audit their coverage in the EVCC pairing and positioning sub-domain before Hyundai’s pending applications are granted.

Dynamic Wireless Charging Moves from Laboratory Demonstration to Highway Deployment Planning

Dynamic Wireless Power Transfer (DWPT) — inductive charging of EVs while in motion via coils embedded in road surfaces — has crossed a critical threshold: the research literature from 2022–2023 shows a decisive shift from laboratory validation to highway-scale optimisation modelling. The FABRIC European project demonstrated 20 kW inductive WPT at 0–100 km/h on real public roads (IFSTTAR/VEDECOM, France, 2019). More recent work from the National University of Ireland Maynooth (2022) modelled that electrifying just 5% of road infrastructure with DWPT coils could meaningfully extend driving range for EVs in cities including New York and Xi’an.

The 2023 paper from the Faculty of Science and Technology of Fez (Morocco) represents a further maturation step: mathematical optimisation of DWPT segment placement for heterogeneous battery vehicles on bi-directional highways. This is costed, deployable infrastructure design — not laboratory demonstration. The convergence of DWPT with connected and automated vehicles (CAVs) is particularly significant: research from Chang’an University (2022) and Shandong Key Laboratory (2023) both integrate DWPT with CAV trajectory optimisation at signalised intersections, signalling that the charging interface for autonomous freight fleets will likely be wireless rather than conductive.

IP around DWPT coil placement algorithms, foreign object detection, inter-vehicle power sharing, and multi-vehicle simultaneous charging is not yet crowded in this dataset — representing a window for early patent filings. The parallel development of heavy-duty EV charging is creating a separate standardisation track: the 2022 VTT Technical Research Centre of Finland roadmap explicitly identifies vehicle-roof and infrastructure-side pantographs as the preferred interfaces for heavy-duty EVs, distinct from plug-based light vehicle standards. This pre-normative standardisation phase in Europe means the IP landscape for pantograph mechanical design, contact force control, automated alignment, and high-current thermal management is still forming.

Geographic Innovation Clusters: China, Korea, Europe, and North America

Innovation in EV fast charging interface technology is broadly distributed across at least six major regions in this dataset, with no single organisation holding a dominant position at the system integration level — a pattern consistent with a field in a competitive, pre-dominant-design phase. Each region has a distinct innovation profile reflecting its industrial structure and policy priorities.

China: Standards Leadership and GB/T to ChaoJi Transition

State Grid Electric Power Research Institute and NARI Group Corporation produced the most operationally specific standards research in the dataset, covering ChaoJi interface design, US-China interoperability testing, and control pilot circuit analysis. Tongji University, Southeast University, and Southwest Jiaotong University contributed simulation and DWPT studies. China’s dominance in GB/T standard development and the ChaoJi initiative signals an ambition to establish the next global charging standard baseline — and if ChaoJi gains IEC endorsement, it will redraw the connector hardware and control pilot IP landscape significantly.

Korea: OEM Communication-Layer IP

Hyundai Motor Company holds the two most technically specific communication-layer patents in the dataset — both pending as of 2022 and 2024 — and is the only OEM with active patent filings specifically targeting the EV–EVSE communication handshake in this dataset. This is a notable concentration of IP positioning at exactly the layer that will matter most as physical connector standards converge.

Europe: Interoperability Frameworks and V2G Standards

European academic and research institutions dominate the review literature on power electronics topologies, V2G standards, and e-roaming interoperability. SAP SE holds an active EP patent on infrastructure control logic. Eindhoven University of Technology (2018) and IKEM Berlin (2022) reflect sustained EU institutional attention to protocol convergence and e-roaming. Delft University of Technology (2021) specifically addresses V2G infrastructure standardisation bottlenecks — a precursor to the EVSE-to-EVPE upgrade requirements that the Norwegian University of Science and Technology (2022) later documents in detail.

United States: XFC Power Electronics Research

Academic research from Clemson University, University of Ontario Institute of Technology, and Baylor University focused on XFC power electronics and SST architectures, reflecting US DOE interest in 350 kW+ charging. Commercial patent activity from US entities is limited in this dataset — Volta Industries LLC holds a design patent for EV charging system physical form factor (US, 2019, now inactive) — suggesting that North American commercial IP development in XFC has not yet matched the academic research output documented here.

Strategic Implications for IP and R&D Teams in 2026

Standards fragmentation remains the dominant IP risk for any organisation building EV charging hardware or software in 2026. CCS, CHAdeMO, GB/T, and ChaoJi coexist without full harmonisation, and the trajectory of ChaoJi’s adoption in China and Japan will determine whether adapter compatibility claims become the most contested IP battleground in the connector hardware sub-domain. If ChaoJi gains IEC endorsement, it will redraw the control pilot circuit IP landscape significantly — and organisations that have not mapped their existing claims against ChaoJi’s revised pilot circuit architecture face exposure.

Five forward directions are identifiable from the 2022–2024 records in this dataset, each with distinct IP implications:

• Dual-technology communication interface — The 2024 Hyundai patent architecture (positioning + V2GTP session) anticipates automated charging for autonomous vehicles. Other OEMs and Tier 1 suppliers should audit coverage in the EVCC pairing and positioning sub-domain.
• ChaoJi as next unified global standard — Active pre-deployment standardisation work from State Grid positions ChaoJi as a consolidation candidate. Adapter compatibility claims will be a key IP battleground.
• Dynamic wireless charging at highway scale — IP around coil placement algorithms, foreign object detection, and multi-vehicle simultaneous charging is not yet crowded. A window for early filings remains open.
• Heavy-duty pantograph interface standardisation — Pre-normative standardisation in Europe is ongoing. The IP landscape for pantograph mechanical design, contact force control, and high-current thermal management is still forming — early movers face limited prior art density.
• V2X bidirectional interface as grid asset — EVSE must be upgraded to EVPE (Electric Vehicle Power Exchange Equipment) to fully enable V2X, requiring updated communication protocol stacks, bidirectional converter hardware, and modified grid interconnection agreements. This upgrade path creates IP opportunity in the bidirectional converter and protocol stack sub-domains.

The field’s innovation is broadly distributed across many institutions rather than concentrated in one or two players — consistent with a pre-dominant-design phase at the system integration level. This distribution means that well-targeted patent searches using tools such as PatSnap Eureka can surface white-space opportunities that are genuinely open, rather than already foreclosed by an incumbent’s blocking portfolio. The PatSnap innovation intelligence platform covers more than 2 billion data points across 120+ countries, providing the coverage depth needed to assess prior art density in fast-moving, multi-jurisdiction fields like EV charging interfaces.