As electric vehicles, industrial equipment and marine applications move toward higher power density, integrated OBC + DC/DC converter solutions are becoming increasingly popular due to their compact design and improved system integration.
However, higher power output also brings greater thermal challenges. During charging and power conversion, heat generated by semiconductors, magnetic components and control circuits can affect efficiency, reliability and product lifespan.
For medium and high-power applications, choosing the right cooling method has become a key factor in the performance of electric power systems.
An integrated On-Board Charger (OBC) and DC/DC converter combines AC-DC charging and DC voltage conversion functions into a single compact module.
While this design saves installation space and simplifies system integration, it also creates concentrated heat zones inside the housing.
Main thermal challenges include:
- Higher temperature stress on power semiconductor components
- Reduced efficiency caused by excessive heat accumulation
- Accelerated aging of electronic components
- Limited heat dissipation space in compact vehicle designs
These challenges are especially critical in applications requiring long-time operation, such as electric forklifts, commercial vehicles, marine vessels and construction equipment.
Air cooling uses aluminum heat sinks and natural or forced airflow to remove heat from power components.
- Simple structure
- Lower cost
- Easy maintenance
- Suitable for low-power equipment
Air-cooled OBC and DC/DC solutions are commonly used in:
- Golf carts
- Small electric vehicles
- Light-duty AGVs
- Low-power mobility equipment
However, as power levels increase, air cooling faces limitations in heat transfer capability, system size and continuous high-load operation.
For applications requiring higher power density and 24/7 reliability, a more advanced thermal solution is needed.
Liquid cooling improves thermal performance by transferring heat directly from power components through coolant circulation.
Compared with air cooling, liquid cooling provides better temperature control and enables higher power density designs.
Key advantages include:
Liquid cooling maintains a more consistent operating temperature, helping power electronics achieve stable efficiency during continuous operation.
Liquid-cooled modules are suitable for demanding environments, including:
- Extreme temperature conditions
- Marine applications
- Heavy-duty industrial vehicles
- Commercial EV fleets
By reducing dependence on large heat sinks, liquid cooling allows manufacturers to develop smaller and more powerful integrated OBC-DC/DC modules.
This makes it an ideal solution for modern electric platforms where installation space is limited.
At Hangzhou CTS Power Electronics Technology Co., Ltd., we focus on developing reliable power conversion solutions for global electric mobility and industrial electrification markets.
Our integrated OBC + DC/DC converter solutions feature advanced thermal management, high-efficiency conversion and flexible customization capabilities for OEMs and system integrators.
CTS Charger solutions support applications including:
- Electric vehicles
- Commercial vehicles
- Electric forklifts
- Marine vessels
- Construction machinery
- Agricultural equipment
With optimized liquid cooling technology and robust power electronics design, CTS Charger helps customers achieve safer, more efficient and more reliable electrification systems.
| Application | Recommended Solution |
|---|---|
| Golf carts & small AGVs | Air-cooled OBC/DC-DC |
| Low-power electric vehicles | Air cooling |
| Passenger EVs | Liquid-cooled OBC/DC-DC |
| Electric forklifts | Liquid cooling |
| Marine & heavy-duty equipment | Liquid cooling |
Thermal management directly impacts the efficiency, reliability and lifespan of electric power systems.
While air cooling remains a practical choice for low-power applications, liquid-cooled integrated OBC-DC/DC converters are becoming the preferred solution for medium and high-power electrification platforms.
As electric mobility continues to evolve, advanced thermal designs will play a critical role in improving system performance and supporting the next generation of electric vehicles and industrial equipment.
Looking for a customized OBC, DC/DC converter or integrated charging solution? Contact CTS Charger for professional OEM/ODM support.
