[1] Advanced Conversion Solutions for DC Power Distribution Networks

D. Dujic

[2] Performance Evaluation of Isolated DC/DC Converters in Modularized Bridge Rectifier Solid-State Transformer

Z. Li; A. Cervone; D. Dujic

Modularized Bridge Rectifier (mBR) is a promising architecture of single-stage solid-state transformer. Without the presence of AC/DC active rectifier, the system performance solely depends on the control and optimization of isolated DC/DC converters. This paper presents a comprehensive analysis of DC/DC converters in mBR, covering topology selection, efficiency optimization, and design considerations. Additionally, under the specifications of 750kW and 10 kVac/760 Vdc, two existing control methods of mBR are compared with a focus on their impact on the performance of DC/DC converters.

[3] Evaluation of Magnetic Integration in Modularized-Bridge-Rectifier Solid-State Transformer

Z. Li; D. Dujic

Modularized Bridge Rectifier (mBR) is a promising solid-state transformer (SST) topology that replaces active front-end stages with diodes and utilizes multiple isolated DC/DC converters. This paper investigates magnetic integration schemes to mitigate the oversizing issue in mBR designs, which arises from the intermittent operation of DC/DC converters. By exploring different integration levels-branch, leg, and phase-this work provides a detailed comparison of their impact on component count, power rating, and manufacturing complexity. Simulation results demonstrate that the appropriate integration method can reduce the power capacity requirement of magnetic components and secondary-side circuits by 50%.

[4] Modularized Diode Rectifiers: A New Family of Solid-State Transformers

A. Cervone; Z. Li; D. Dujic

Solid-State Transformers are conventionally based on a multi-stage architecture, with an input and/or an output AC/DC converter (for interfacing with the AC grid and/or the load), and with an isolated DC/DC conversion stage (to provide insulation and voltage/current scaling). Alternatively, some single-stage SST circuits use AC/AC conversion modules and rely on bidirectional blocking devices, which however have limited commercial availability and face significant operational challenges. This letter explains the derivation, operating principle, and fundamental topologies of a new family of solidstate transformers, named Modularized Diode Rectifiers. Their architecture is derived from the integration, within basic diode rectifier circuits, of DC/DC converter modules, which are fed by unipolar pulsating voltages. Despite using only DC/DC modules, this family of circuits can achieve isolated AC/DC and/or AC/AC conversion, can provide power factor corrector features, and can be easily scaled for higher voltage and/or current ratings.