Prax High-Frequency Magnetics for DC/DC Converters in BESS
The future of large-scale energy storage is happening now.
Redox Flow Batteries are emerging as a key technology for grid-scale storage by offering long life, scalable capacity and stable cycling performance.
Prax developed a new high-frequency magnetic solution specifically for the next generation of DC/DC converters in BESS.
It’s designed to support demanding topologies like DAB, while meeting the electrical and thermal challenges presented.
Market trends
Redox flow batteries are becoming a strong alternative for large-scale energy storage. They allow to independently scale energy and power capacity, while offering long operational life and high cycle stability with minimal degradation.
Connection is made by bidirectional DC/DC converters used to manage the controlled charge and discharge through the DC bus. These converters require specific magnetic components to ensure efficient, reliable, and long-lasting operation.
Typical requirements
- Power Requirements: 5 to 20kW.
- Input Voltage Range (from inverters): 600 to 1000V DC.
- Output Voltage Range (to stacks): 40 to 120V DC.
- Peak Currents: Up to 300A.
- Common topologies: Dual Active Bridge (DAB).
- Switching frequency: 80 to 200kHz.
- Tight inductance tolerances.
- Good thermal management.
Prax approach
Transformer integrated resonant inductor
- Tighter inductance tolerances: <10%.
- Reduction of fringing effect.
- Good disipation.
- Shielded magnetic stray fields from leakage inductance.
- Easy coupling factor adjustance.
- Working Voltage: Up to 1500V.
- Hi-pot isolation: Up to 5000Vac.
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