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48 Volt - Technology with a Future.

Increasing efficiency requirements in vehicles, data centers, and industry are driving new vehicle electrical system and power supply concepts forward. This article shows the opportunities that arise from this trend, where the technical hurdles lie, and what matters in implementation.

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Whether in a vehicle or a data center, the demand for innovative electronic architectures is increasing. And all sectors are pursuing the same goal: efficient energy use, easy integration, and reliable performance. 48 V systems are regarded as a promising approach, but their potential is associated with several challenges, for example with regard to compatibility and safety. Accordingly, the demands placed on the precision, functionality, and standards compliance of the development-accompanying test and measurement technology are high. An overview of the prospects and hurdles of 48 V technology.

48 Volt at the Center of Attention.

48 V systems are in focus for various reasons. One reason is that CO2 and emissions regulations are becoming more stringent worldwide, effectively forcing vehicle manufacturers, for example, to develop ever more efficient drive and vehicle electrical system concepts. 48 V solutions are regarded as an ideal bridge technology between conventional 12 V architectures and the high-voltage systems of fully electric vehicles (400 to 800 V). For the same power, higher voltages require lower current, which noticeably improves efficiency in supply lines and cables. This enables smaller cable cross-sections, less heat generation, savings in material and weight, and more compact designs. In many applications, this is the key to achieving the required energy savings.
Battery systems are also being continuously improved, particularly with regard to energy density and safety. Modern vehicles require increasingly more electrical power for their auxiliary systems: adaptive suspensions, electric turbochargers, high-performance air-conditioning compressors, or driver assistance systems. With 48 V, such power-intensive applications can be operated much more efficiently, and recuperation potential can be utilized that is only poorly achievable, if at all, with 12 V.
Efficiency pressure is also driving the 48 V trend in other sectors: in data centers or telecommunications networks, higher power densities can be realized, losses in power distribution can be reduced, and stable infrastructures can be provided even under difficult conditions. In industrial automation, 48 V enables more compact, more energy-efficient, and more powerful machines. Taken together, these various factors make 48 V a truly strategic key topic.

Modern 48-Volt Applications.

A key area of use is the automotive sector. 48 V systems control start-stop functions, improve regenerative braking, and supply subsystems such as power steering, electric turbochargers, heating systems, or oil pumps. Many comfort and safety functions that used to be mechanical can now only be supplied efficiently with a higher vehicle electrical system voltage.
Newer fields of application include commercial vehicles, off-highway machines (construction vehicles, etc.), and bicycles. Typical applications are APUs (auxiliary power units) for stationary air conditioning and onboard power supply, lighting systems, or energy storage systems. In light commercial vehicles and city buses, 48 V technology makes it possible to operate additional loads independently of the combustion engine or implement plug-in-capable hybrid solutions.
In AI data centers and supercomputer architectures, high power levels must likewise be distributed, while energy demand continues to increase. The transition to 800 V DC distribution in the rack with direct DC/DC conversion to 48 V at the server or storage system is a key approach for high-performance data centers. The aim is to minimize the enormous energy losses of traditional AC infrastructures at high rack density.
Further applications arise in the context of renewable energies: 48 V harmonizes very well with the output voltages of many photovoltaic modules. In hybrid power supply systems, especially in off-grid areas, this makes it possible to eliminate costly high-voltage converters and reduce energy losses. The areas of use are diverse, and all pursue the same goal: higher efficiency, better integration, and reliable performance.
In industrial power supply and industrial automation, 48 V architectures in turn offer precise, space-saving solutions for motor controls, robots, or conveyor systems.

Challenges in Transitioning to 48 V Architectures.

A major hurdle lies in compatibility: not every component of a 12 V system automatically tolerates 48 V, so components must be replaced or newly developed. Constraints in financial planning and availability can delay projects even further. For manufacturers, the transition initially means investment: in battery modules, DC/DC converters, or control units. When integrating into existing platforms, parallel operation of 12 V and 48 V systems is often required, which calls for well-thought-out energy coupling and robust management of the voltage domains.
The higher voltage level brings new requirements in terms of precise voltage regulation and effective EMC measures. Although 48 V reduces currents and improves efficiency, the focus of electromagnetic interference shifts due to the required power electronics (DC/DC converters), which must be taken into account in the design.
Depending on the sector, further hurdles arise: in telecommunications, this includes adapting existing network infrastructures, while in industrial automation, standards and certifications play a major role. There are also increased safety requirements, because although 48 V is still considered low voltage, it entails higher risks in the event of operator error or inadequate insulation. And although 48 V systems allow thinner cables, which is an advantage especially in confined installation spaces, this benefit is partially offset by the additional space required for DC/DC converters and their cooling.
As 48 V is also increasingly being used in commercial vehicles or bicycles, this places additional demands on robustness and reliability. Components must withstand vibration, dust, moisture, and severe temperature fluctuations. This not only affects the design, but also makes test scenarios more complex. Finally, acceptance is also a factor: end customers must adopt the new technology, development departments must adapt their processes, and service facilities or workshops must gear their diagnostic tests and equipment to the higher voltages.

Test and Measurement Technology for Specific Test Requirements.

For voltage design applications, test and measurement technology fundamentally places the highest priority on precision and safety, especially for 48 V systems. Here, voltages of up to 60 V DC and peak currents in some cases exceeding 200 A are measured. Added to this are rapid load changes, for example during the transition from recuperation to boost mode, as well as expanded interference phenomena, fast transients, and complex energy management.
The specific test requirements involved in validating and characterizing a 48 V design require high-quality, innovative test and measurement equipment. Core functions include fast response times and deterministic behavior, high sampling rates, wide measurement ranges, and multi-channel options. The goal is to ensure the efficiency, service life, and operational safety of the systems and to detect potential problems at an early stage.
The spectrum of measurement tasks ranges from highly dynamic processes in energy recovery and long-term stress tests of electric heating systems to precise energy balances of complete vehicle electrical systems with multiple 48 V and 12 V subsystems. In addition, power analyses, monitoring tasks, EMC tests, safety tests, battery tests, or simulation tests must be carried out. High test coverage is required in order to map all operating states and application scenarios as well as boundary ranges and fault cases. Last but not least, seamless documentation of all measured values must be considered in order to demonstrate safe and standards-compliant operation.
Modularity plays a major role in the use of modern test and measurement technology for 48 V systems. Modular measurement platforms offer high flexibility by allowing precise adaptation to specific requirements. If demand increases or the application changes, the instruments can be expanded without difficulty and upgraded to new technologies. This offers enormous savings potential.

Conclusion: Supporting the Transition to 48 Volt Holistically.

The transition to 48 V systems is not merely a question of electrical parameters. It also involves mechanical aspects, safety standards, EMC, future service and maintenance requirements, and, not least, costs. 48 V architectures can entail high initial investments and extensive planning, which often only pay off in the medium to long term.
In addition to an inventory of existing components suitable for 48 V as well as new components, for example DC/DC converters, this also includes the standards-compliant implementation of safety and insulation measures. Additional shielding may require more space, which can quickly become a critical issue in a vehicle or control cabinet. It is also worth looking at future developments, such as solid-state batteries or intelligent battery management systems, so that the new design remains future-proof.
Since many loads are still natively designed for 12 V, especially mobile devices, compatibility with 12 V devices must also be taken into account when transitioning to 48 V (hybrid 12/48 V solution). Components should be designed for thermal and mechanical stresses; protection and cooling concepts must function across different application scenarios. Interfaces for future expansions - such as APUs or external energy sources - can also be part of a holistic concept in order to avoid costly retrofits later on.
Those who bring the right partners for electronic components and test and measurement technology on board minimize risks and accelerate implementation.

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