Abstract
The auxiliary power supply in a power converter is a key topic in the optimization of the converter’s low-voltage electronic circuit performance. In this article, a low-voltage DC-AC soft-switching full-bridge topology, with an innovative, driven technique to achieve a zero-voltage transition, is presented and discussed. The full-bridge converter drives a high-frequency transformer (called the main transformer) that on the secondary side, distributes an AC voltage and current to the several electronic circuit’s supplies. Every power supply is composed of an HF transformer (called load transformer) that converts the AC secondary voltage of the main transformer to the voltage and current levels requested by the electronic circuit. In this paper, the operating conditions are first investigated by several simulation results. Furthermore, an actual DC-DC power converter is used as a workbench for an experimental investigation of the effectiveness of the proposed auxiliary DC-AC soft-switching topology, and the AC distribution approach, to realize the several points of load power supply requested. Finally, the advantages and drawbacks of this auxiliary power supply solution are critically discussed, providing guidelines for the power converter designer.
Highlights
Nowadays, many efforts are directed at the development of innovative topologies of power converters with high efficiency and increasingly reduced in space, as well as enhanced switching device technologies, to improve reliability and performance [1–3]
Every power supply is composed of an HF transformer that converts the AC secondary voltage of the main transformer to the voltage and current levels requested by the electronic circuit
An actual DC-DC power converter is used as a workbench for an experimental investigation of the effectiveness of the proposed auxiliary DC-AC soft-switching topology, and the AC distribution approach, to realize the several points of load power supply requested
Summary
Many efforts are directed at the development of innovative topologies of power converters with high efficiency and increasingly reduced in space, as well as enhanced switching device technologies, to improve reliability and performance [1–3]. In electronic boards, there may be additional specific circuits with different power supplies and these are obtained through the point-of-load (PoL) solutions, which can be:. The common solution presented in the literature, and used in many actual applications, is to have a main power supply circuit, such as a Flyback [13,14], or a Forward converter with multiple outputs [15]. A soft-switching full-bridge silicon MOSFET converter is used as the main DC/AC isolated power supply, powering several LPS circuits through an AC bus distribution. The isolated AC bus is distributed up to the point of load requested for the power supply of the electronic low-voltage circuits, increasing system noise immunity (antenna effect is avoided). Validate the operation of the main auxiliary converter; In the fourth section, an actual case of study is presented and the AC distribution solution for the auxiliary power supplies are considered. H3.alHf-barlifd‐gberipdogweerpcoonwveerrtecrownivtherthteermwainithlowth-veolmtagaeinelelcotrwon‐vicoclitracugiets ethleact tnreoendic circu auaxuixliailriyapryowpeor wsueprplsieusp. plies
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