The electric vehicle (EV) industry is undergoing a radical shift in powertrain architecture. As manufacturers strive for longer ranges, faster charging times, and more compact vehicle designs, the demand for high-density power electronics has reached an all-time high. Among these innovations, the 2-in-1 integrated solution—combining the On-Board Charger (OBC) and the DC-to-DC Converter—has emerged as a game-changer for OEMs across the passenger car, commercial vehicle, and industrial machinery sectors.
In this article, we explore why this integration trend is accelerating and how it provides a competitive edge for EV manufacturers and solution providers.
In the early stages of electrification, the OBC and DC-to-DC converter were typically housed in separate enclosures. The On-Board Charger is responsible for converting AC power from the grid into DC power to charge the high-voltage traction battery. Meanwhile, the DC-to-DC Converter steps down that high-voltage power to a lower level (usually 12V or 24V) to power auxiliary systems like lights, sensors, infotainment, and steering.
While functional, this discrete setup presents several challenges:
- Redundant Housing: Two separate metal casings add unnecessary weight and volume.
- Complex Cabling: High-voltage interconnects between the battery and two different devices increase the risk of electromagnetic interference (EMI) and add failure points.
- Cooling Challenges: Managing the thermal loads of two distinct systems requires more complex routing for air or liquid cooling systems.
The 2-in-1 integrated unit merges these two critical components into a single chassis, sharing a common cooling plate, control circuitry, and housing. This is not just a physical "stacking" of parts; it is a fundamental redesign of the power conversion process.
For vehicle designers, space is the most valuable currency. By integrating the OBC and DC/DC converter, manufacturers can reduce the total volume by 20% to 30% compared to separate units. Weight reduction is equally impressive, often stripping away several kilograms of aluminum housing and internal connectors. In applications like electric golf carts or compact electric motorcycles, these savings directly translate into improved energy efficiency and vehicle handling.
Thermal stability is the cornerstone of reliability in power electronics. Integrated 2-in-1 units allow for a shared liquid-cooling or air-cooling infrastructure. This means one set of coolant pipes can regulate both the charging process (when the vehicle is stationary) and the DC conversion process (when the vehicle is in motion). At CTS, our liquid-cooled OBC+DC/DC solutions ensure optimal temperature regulation, extending the lifespan of internal semiconductors even in harsh environments.
Electromagnetic interference (EMI) is a major headache for EV engineers. High-speed switching in chargers can interfere with sensitive onboard electronics. By housing both converters in a single shielded enclosure and minimizing the length of high-voltage wiring between them, the 2-in-1 design inherently reduces the "noise" emitted by the system. This makes it easier for OEMs to meet stringent international standards like CISPR 25.
B2B buyers, particularly Distributors and Solution Providers, are highly sensitive to Total Cost of Ownership (TCO). While the initial unit cost of a high-quality 2-in-1 might be comparable to two separate low-end units, the "hidden" savings are massive:
- Fewer high-voltage connectors and cables required.
- Simplified mounting and assembly on the production line.
- Reduced supply chain complexity—one vendor instead of two.
The benefits of 2-in-1 integration aren't limited to passenger cars. In fact, some of the most demanding industries are leading the charge:
- Marine Propulsion: Electric boats and yachts operate in confined, high-humidity environments where space-saving and sealed (IP67) integrated units are mandatory.
- Construction & Agriculture: Electric excavators and tractors require ruggedized power electronics that can withstand intense vibrations. A single, integrated unit is far more durable than multiple interconnected components.
- Commercial Fleets: For electric delivery vans, the increased payload capacity gained from weight savings in the engine bay directly impacts profitability.
At Hangzhou CTS Power Electronics Technology Co., Ltd., we have dedicated years of R&D to perfecting the 2-in-1 On-Board Charging solution. Our products feature high power density, efficiency exceeding 95%, and full compatibility with CAN-bus communication protocols for seamless battery management.
We understand that our B2B partners aren't just looking for a component; they are looking for a reliable, scalable solution that minimizes engineering overhead. Whether you are building an electric passenger car fleet in Europe or specialized agricultural machinery in Southeast Asia, our integrated units are designed to meet global certification standards including IATF 16949.
The move toward 2-in-1 (OBC + DC/DC) integration is more than just a trend—it is a technical necessity for the next generation of EVs. By prioritizing integration, OEMs can achieve lighter, more efficient, and more reliable vehicles while simultaneously reducing costs.
Are you planning a new EV project or looking to upgrade your current power electronics? Contact the CTS technical team today to request a datasheet or a customized consultation for your specific industry needs.
