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AI Server Power Magnetics

48V AI Server PSU Flat Transformer: EQ Flat Core and High-Current Copper Busbar Output

Key finding: In 48V AI server PSU designs, the transformer should be reviewed as a high-current output path, not only as a turns-ratio component.

This guide summarizes ProMagTech's flat transformer design points for 48V AI server power supplies, including EQ flat core structure, copper busbar output, compact integration, thermal performance and automated assembly readiness.

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48V AI server PSU flat transformer with EQ flat core and copper busbar output

1. Application Context

AI server power supply architectures keep moving toward higher current density and tighter mechanical envelopes. In the 48V distribution path, the DC-DC stage needs magnetic components that can carry high current, fit into compact power modules and remain manufacturable at scale.

2. Structure Reviewed in This Guide

EQ flat core design
A flat magnetic structure helps reduce height and improve power density when the mechanical envelope is constrained.
High-current copper busbar output
The output path uses copper busbar geometry to lower conduction loss and support high-current DC-DC conversion.
Automation-friendly assembly
A simpler, more repeatable structure supports fixture-based assembly and process consistency.
Thermal path
Low temperature rise requires reviewing winding loss, busbar loss, core loss, contact surfaces and airflow together.

3. Engineering Review Points

The review should include topology, switching frequency, input and output voltage range, power level, primary and secondary RMS current, copper busbar current density, insulation system, creepage and clearance, core material, winding layout, thermal interface and validation conditions.

For AI server PSU applications, a compact transformer that looks good in a drawing can still fail if high-current termination, hotspot location or assembly repeatability is not reviewed early. The practical question is whether electrical loss, heat path and production method remain aligned after the mechanical package is reduced.

4. Evidence Boundary

The public material shown here is a design guide and application illustration. Final transformer feasibility and performance must be confirmed against the customer topology, electrical specification, mechanical envelope, insulation requirement, cooling condition and sample validation data.

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Download the English 48V AI server PSU flat transformer guide for internal engineering review and supplier discussion.

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