In this landscape, it's a record that combines bidirectional DC-DC converter or related converter terminology with claim language around high power density, integrated power modules, planar magnetics integration, or miniaturization, anchored to IPC classes H02M3/335, H01L25/07, or H01F27/28. This excludes patents on pure converter topology or control algorithms that don't address size, density, or integration. The distinction matters because generic converter topology art is far more crowded than the integration-specific slice mapped here.

The data shows a rise from 14 filings in 2017 to a peak of 26 in 2020, then a decline through the 2022 midpoint of 18 and beyond. This pattern is typical of a technology area where core claim space has become occupied — later entrants face more prior art to design around, which can suppress new filing volume. However, the most recent one to two years in any patent dataset are always undercounted because publication lags filing by roughly 18 months, so the true 2025-2026 filing rate is higher than currently visible.

The United States accounts for 164 of 307 records, more than half the corpus, making it the primary jurisdiction for a freedom-to-operate check. Europe (45) is a clear second, with China (27), India (24), and Japan (16) trailing at meaningfully lower volumes. Companies manufacturing in China or India should still run a targeted regional search, since local filing bases there are smaller but growing relative to EV production footprints.

Not necessarily. Citation counts inside a searched corpus favor older records simply because they've had more years to accumulate citations from later filings — the most-cited records here date back to the early 2000s or earlier. High citation counts are a better signal of foundational influence on later claim drafting than of current commercial relevance or enforceability, especially since many older core patents will have expired.

The IPC composition shows H02M as the dominant subclass at 298 of 307 records, while H01L (semiconductor devices, 44) and H01F (magnetics, 25) appear far less often despite being directly relevant to integration and miniaturization claims. This gap suggests that claims combining converter function with specific semiconductor-packaging or planar-magnetics structures — rather than converter circuitry alone — face thinner prior art. Multi-port topology control and stacked power-module packaging are two areas within that gap worth deeper diligence.