High voltage and bidirectional upgrade of car DC/DC power module, adapting to 800V platform has become the mainstream trend
Time：May 27,2026
In 2026, the DC/DC power module for new energy vehicles will enter a critical period of technological iteration, with high voltage, bidirectional, and high power density becoming the core upgrade directions, fully adapting to the popularization needs of 800V high-voltage platforms. The unidirectional DC/DC module under the traditional 400V architecture is no longer sufficient for ultra fast charging, energy recovery, and vehicle network interaction scenarios. The industry is accelerating its evolution towards bidirectional topology, achieving bidirectional energy flow between high-voltage DC and low-voltage DC. It can charge 12V low-voltage batteries and also reverse boost under specific working conditions, helping to improve the efficiency of braking energy recovery to over 85% and directly increase vehicle range by 5% -10%.
On the technical level, the large-scale application of silicon carbide (SiC) power devices has become a key breakthrough point. Compared to traditional silicon-based IGBTs, SiC devices have lower conduction losses, higher switching frequencies, and a wider operating temperature range, which increases the power density of DC/DC modules by 30% -50%, reduces their size by nearly 40%, and achieves a conversion efficiency of over 98.5%. To adapt to the 800V platform, the input voltage range of the module has been expanded to 200V-1000V, and the output power covers 1.2kW-3kW, which can meet the full scenario requirements of passenger cars, commercial vehicles, and special-purpose vehicles.
On the market application side, the installation rate of bidirectional DC/DC modules is rapidly increasing. By 2025, the installation rate of mainstream high-end models has reached 100%, and by 2026, it is penetrating towards mid-range models. At the same time, there is a significant trend towards module integration, gradually integrating with OBC, PDU and other components into a multi in one power unit, simplifying the layout of the vehicle's high-voltage wiring harness, and reducing system complexity and production costs. In addition, the thermal management technology has been upgraded synchronously, and the liquid cooling solution has replaced traditional air cooling, increasing the heat dissipation efficiency by 50%, ensuring stable operation of the module under high load conditions and meeting the ASIL-D functional safety level requirements. Industry data shows that by 2025, the market size of China's bidirectional DC/DC in vehicles will reach 8.76 billion yuan, a year-on-year increase of 18.3%. It is expected to exceed 10 billion yuan by 2026, becoming the fastest-growing sub sector of new energy vehicle power systems.
keywords： High voltage and bidirectional upgrade of car DC/DC power module, adapting to 800V platform has become the mainstream trend
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