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Resonant Converters

D24.2 - High-Bandwidth LLC Bus Converter with Direct Effective Power Control (D-EPC) for Power Delivery to Next-Generation AI Processors

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
The rapid growth of AI computing has intensified power integrity (PI) challenges in data centers, therefore advanced dynamic power management is required to maintain high PI. AI processors with IVR (Integrated Voltage Regulator) induce high-speed load transients to the upstream bus converter. Therefore, fully regulated high-bandwidth LLC bus converters are needed. However, conventional unregulated LLC bus converters are not capable due to their unregulated nature. To overcome this drawback, we propose a fully-regulated high-bandwidth LLC converter employing Direct Effective Power Control (D-EPC), which controls effective resonant input power, enabling fast transient response. A test board of 48 Vin, 12 Vout, and100 W was implemented and tested. As a result, a 20 kHz loop bandwidth was achieved, with measured transfer functions closely matching theoretical predictions, confirming the suitability of D-EPC LLC converters for compact, high-performance AI processor power delivery.