Every electric car carries a quiet army of power chips switching current thousands of times a second. For years those chips came from Germany and Japan. In China's garages, that is no longer the default.
From import-dependent to home-grown
The chips in question are power modules — the muscles of an electric drivetrain. They sit inside the inverter, converting battery direct current into the alternating current that turns the motor. The two workhorses are the IGBT, a mature silicon switch, and the newer silicon-carbide (SiC) device that shines in fast-charging, high-voltage platforms.
China's explosive new-energy-vehicle growth did more than sell cars; it created a captive market for these components and a forcing function for local supply. The result, visible in early-2026 industry installation data, is a clear changing of the guard.
According to fitment data compiled by Gasgoo Research Institute for January to July 2026, Chinese suppliers led China's automotive power-module market. BYD Semiconductor (比亚迪半导体) sits at the front, with CRRC Times Electric (中车时代) and Silan Microelectronics (士兰微) close behind, while Infineon — for years the dominant foreign supplier — has slipped to a small single-digit share. Domestic names occupy most of the top ten slots.
Why IGBT came first, SiC is next
IGBT was the natural starting line. It is a proven technology matched to the dominant 400-volt platforms, and Chinese makers could climb the learning curve without exotic materials. Silicon carbide is the harder, higher-reward frontier: it enables 800-volt architectures and dramatically faster charging, but it demands tighter manufacturing control.
Here the picture is more mixed. Foreign giants Infineon and STMicroelectronics still hold strong positions in SiC modules, but Chinese suppliers — led by BYD — are closing the gap fast, and BYD in particular has pushed into the top tier of SiC fitments during 2026.
The BYD model
BYD's rise illustrates the Chinese playbook. The carmaker makes its own power modules for its own vehicles, so its semiconductor unit has a guaranteed internal market that de-risks the long, expensive climb up the reliability curve. That vertical integration is why a single automaker can also be a top-tier chip supplier.
CRRC Times leans on a different heritage — decades of building traction power electronics for high-speed rail — which transferred neatly into automotive inverters. StarPower Semiconductor (斯达半导体) grew as an independent module specialist supplying multiple carmakers. Different routes, same destination: local supply that foreign leaders no longer monopolise.
What it means for the supply chain
For global carmakers, the shift is double-edged. On one hand, a deep local supply base in China lowers cost and shortens lead times for vehicles built there. On the other, it concentrates a critical component in one country's ecosystem, raising questions of resilience for brands that once sourced purely from Europe or Japan.
None of this means foreign suppliers disappear. Infineon and STMicroelectronics remain formidable in the highest-end SiC and in global OEM accounts outside China. But the center of gravity for the world's largest EV market has plainly moved, and with it the bargaining power over who sets price and pace.
The strategic point is sovereignty. Power modules are exactly the kind of "boring" component that decides whether a nation can build electric vehicles on its own terms — and China has, for the mainstream IGBT segment, effectively answered yes.
The ripple beyond cars
Power semiconductors rarely stop at automobiles. The same IGBT and SiC modules that drive car motors also sit in railway traction, industrial drives, renewable inverters, and grid equipment — all areas where China is investing heavily and where import substitution follows the same logic. CRRC's rail heritage is the clearest example: the skills that moved high-speed trains translate directly into automotive and energy-grade modules. For global industry, the implication is that China's power-chip self-reliance will tighten across the whole electrified economy, not just showrooms. The remaining weak link is the substrate: the ceramic and silicon-nitride carriers that survive thousands of thermal cycles are still concentrated among a handful of Japanese and German suppliers, making that layer the next obvious target for local investment.
Honest limitations
- The leadership figures come from a single Chinese research house (Gasgoo) and reflect installation or fitment counts in China, not global revenue share; treat the rankings as directional rather than definitive.
- SiC module leadership is still contested by Infineon and STMicroelectronics, and the segment is moving faster than any one snapshot captures.
- High-voltage IGBT wafers and the advanced substrates (such as silicon-nitride AMB) used in the most reliable modules remain partly import-dependent.
- We did not audit any module's efficiency or reliability; conclusions rest on published installation data and company disclosures, not testing.
What readers can do now
- Expect Chinese power modules as the default in domestically branded EVs, and factor that concentration into sourcing and resilience planning.
- Track SiC module fitments — the BYD-versus-Infineon/ST contest is the next competitive front, more than IGBT already is.
- Watch substrate localization (especially AMB ceramics), because that upstream piece is the remaining bottleneck for high-reliability modules.