Fraunhofer IAF’s GaN module powers bidirectional off-board charger demonstrator - Charged EVs

The Fraunhofer IAF bidirectional GaN OBC demonstrator signals the second wave of de-siliconization in power electronics—shifting from consumer fast-charging into automotive main circuits. Bidirectional topology demands devices withstand simultaneous high-frequency switching losses and reverse current stress, pushing epitaxial defect density and thermal resistance requirements far beyond consumer-grade specs. The ripple effect propagates both directions: upstream, MOCVD epitaxy equipment capacity will hit its ceiling before substrate supply; downstream, ISO 15118-20 adoption pace determines whether OEMs integrate GaN into 2026 800V platform BOMs. On compliance, EU battery carbon-footprint traceability combined with the 18-24 month AEC-Q200 cycle creates a dual temporal barrier. Supply-chain-wise, the GaN-on-Si route's dependence on 200mm silicon wafers gives Chinese players (Innoscience, Sanan) a structural cost edge, though automotive reliability data remains their gap. In the competitive landscape, Infineon and STMicroelectronics have built automotive-grade moats in SiC; GaN is a defensive play for them. The real wildcard: whether Navitas and EPC complete automotive certification by Q4 2025. The 12-24 month tail effect: EU mandates bidirectional capability for new charging infrastructure by 2026, lifting OBC module value by 40-60%. Whoever secures automotive certification plus OEM design-win first locks in the next five-year window.