Suitable for 800V, 400V, 48V and 12V systems
DC DC converters are essential for the efficient distribution of electrical energy in modern electric vehicles. They ensure a stable power supply by converting high voltage (HV) into the required low-voltage levels (LV) - whether for the 12V vehicle electrical system, 48V systems or for the direct supply of powerful drive and charging systems. Our solutions cover a broad performance spectrum and enable flexible integration into various vehicle architectures.
Thanks to many years of experience in the development of 800V systems, Preh offers high-performance DC DC converters with high efficiency and reliability. Our systems offers state-of-the-art control and protection mechanisms, including over/under voltage protection, temperature monitoring and galvanic isolation, to ensure maximum safety and lifetime.
Innovative topologies and advanced cooling technologies ensure optimal heat dissipation and stable operation under demanding conditions.
Our DC DC converters are functionally safe according to ISO 26262 up to ASIL-D and meet the highest cyber security standards. They can be integrated into existing vehicle architectures and support a wide range of communication protocols. In addition to the hardware, we offer customized software solutions to meet specific customer requirements.
High-performance DC DC converters contribute to an energy-efficient vehicle architecture and enable optimal use of electrical energy in modern electric and hybrid vehicles.
DC DC Converter: 800V to 12/48 (bidirectional)/400V
DC DC converter: 400V to 12V
Low Power DC DC
Versatile DC/DC solutions
Suitable for 800V, 400V, 48V and 12V systems
Main DC/DC converter
Supplying the electrical system of hybrid or electric vehicles while driving
Backup power supply (150W - 350W)
Reliable supply of critical systems in standby mode
SiC-based topology
Higher efficiency and improved thermal management thanks to state-of-the-art semiconductor technology
Latest microcontroller architecture
Precise control of DC/DC conversion and communication
High efficiency up to 94 %
Optimized energy conversion for maximum range and performance
Galvanic isolation
Maximum safety due to electrical separation of HV and LV side
Bidirectional energy flows
Support for flexible energy management depending on the version
Functional safety in accordance with ISO 26262
Developed up to ASIL-D for safety-critical applications
Extensive protection functions
Over/undervoltage protection, temperature monitoring and current limiting
Vehicle communication via CAN
Seamless integration into existing E/E architectures
Compact, modular, customizable design
Flexible integration into different vehicle concepts
Optimized cooling concept
Passive or active cooling, depending on the performance class
Can be combined with other e-mobility products
Can be integrated with on-board charger or power distribution unit for integrated solutions
| Input voltage | 380V - 960V |
| Output voltage | 9V - 16V / 13,3V nom. |
| Output current | Up to 22A |
| Ambient temperature | -40°C - 60°C |
| IP Level | 40 |
| ASIL level | ASIL-A for LV overvoltage protection ASIL-B for LV supply availability ASIL-A for LV safety |
| Cooling concept | Passive cooling |
| Input voltage | 420V – 880V (800V Variant) 240V – 430V (400V Variant) |
| Output voltage | 8V – 14V |
| Output current | Up to 280A |
| Coolant temperature | -40°C - 75°C |
| Ambient temperature | -40°C - 85°C |
| IP Level | Up to IP6K9K |
| System architecture | Autosar 4.x |
| ASIL level | ASIL-A for HV Safety ASIL-B for LV Supply ASIL-D for LV Safety |
| Cooling concept | Active Cooling |
In order to offer our customers tailor-made solutions, we have a variety of cooperation models:
Includes complete development including system design, hardware, software and mechanical design. We develop according to the latest automotive standards such as the V-model and A-Spice Level 3 and carry out test and validation processes in-house.
Our customers have the option of taking over partial developments, e.g. the software or certain parts of it. All other project scopes are taken over by us in accordance with the contractual agreements.
We offer comprehensive manufacturing services for complex automotive products such as BMS and power electronics. We provide support with our expertise in technology, industrialization, logistics and production and guarantee high-quality production in large quantities.
For less complex products, we take over production according to customer specifications. The customer is responsible for development, while we carry out production according to the agreed specifications.
A DC/DC converter is a central element in electric and plug-in hybrid vehicles (PHEV), as it efficiently connects different voltage levels within the vehicle system. Its main function is to convert the battery voltage - typically 400V or 800V - into a stable 12V low voltage.
This 12V supply is essential for numerous conventional vehicle consumers such as control units, lighting systems, infotainment, power windows or safety electronics.
Modern DC/DC converters work with high efficiency, have comprehensive protection mechanisms such as overvoltage and undervoltage protection, temperature monitoring and galvanic isolation, and can be flexibly integrated into different vehicle architectures.
They make a decisive contribution to the energy efficiency and operational safety of modern electric vehicles.
