D02.13 - Analysis and Implementation of a Series-Capacitor Zero-Bias Trans-Inductor Voltage Regulator

Thursday, March 26, 2026

12:00 PM - 1:45 PM CT

Location: Poster 2

Technical Dialogue Presenter(s)

SZ

Shuyu Zhang

University of California, Berkeley

Co-Author(s)

Yicheng Zhu, PhD (he/him/his)

University of California, Berkeley
Jiarui Zou

University of California, Berkeley
RP

Robert C.N. Pilawa-Podgurski

UC Berkeley

This paper proposes and demonstrates a series-capacitor zero-bias trans-inductor voltage regulator (SC-ZB-TLVR) for data center applications. Interphase magnetic coupling enhances the transient response of conventional series-capacitor buck converters while maintaining low ripple. Flux injection from the last phase cancels DC bias in the TLVR cores, reducing the core size requirement and improving power density. Inherent current balancing is provided by series-capacitor feedback, eliminating the need for active balancing control. A large-signal RLC damping model is developed and validated in simulation. A four-phase, 100 A hardware prototype confirms effective flux cancellation, current balancing, and stable operation.