PRL Series

Description

The PRL series is a programmable, regenerative DC load designed for testing power supplies and power distribution systems for AI data centers.
It reproducibly simulates rapid load changes in the microsecond range and feeds the absorbed energy back into the power grid.
This makes it possible to test control behaviour and stability under dynamic load conditions whilst at the same time reducing the energy consumption and heat generation of the test setup.

For Server Power Supplies and HVDC Systems

The PRL series is available in two voltage variants.
The 80-V models are particularly suitable for testing 50-V and 54-V server power supplies and power shelves.
The 1000-V models enable the validation of high-voltage DC power supplies, such as those used in 800-V HVDC architectures.

High Power Density and Modular Expansion

The individual units offer a rated power of 18.5 kW or 25 kW in a 5U enclosure. By connecting up to seven modules per cabinet in parallel in master-slave mode, the test power can be adapted to meet various requirements:

– 80-V models with up to 129.5 kW rated power and 2,800 A continuous current per cabinet
– 1,000-V models with up to 175 kW rated power and 280 A continuous current per cabinet

Even in parallel operation, the dynamic current response in the microsecond range and the high energy recovery efficiency are maintained.
For higher test power, up to eight cabinets can be interconnected in cross-cabinet master-slave operation,
enabling total rated power of up to 1.4 MW.

High Dynamics with Energy Recovery

The PRL series combines rapid load changes—typical of linear electronic loads—with the recovery of absorbed energy back into the power grid.
With current slew rates of up to 60 A/µs, rapid load steps and complex load profiles can be realistically simulated.
Dynamic test frequencies up to 30 kHz enable reproducible testing of the regulation behavior of power supplies for AI applications and other loads with highly fluctuating power requirements.
A energy regeneration efficiency of up to 85% reduces energy consumption, heat generation, and cooling requirements of the test setup—even during dynamic load tests. The power factor on the mains side is ≥ 0.99.

Programmable Load Profiles and Overload Testing

In addition to constant-current, constant-resistance, and constant-power operating modes, the PRL series supports programmable LIST sequences as well as testing of overcurrent and overpower protection functions.
With individually programmed load profiles, load curves can also be simulated in accordance with EDPP requirements for AI data centers.

For short-term load peaks, the PRL series offers an overload capacity of up to 1.6 times the rated power.