A Two-Stage DC/DC Isolated High-Voltage Converter with Zero-Voltage Switching and Zero-Current Switching Applied in Electronic Power Conditioners

Abstract

This paper presents a two-stage DC/DC converter with high efficiency utilized in an electronic power conditioner (EPC), which is widely applicable in satellite communications, etc. The galvanically isolated converter contains two cascaded converters: a buck converter, which is a pre-regulator operating under a closed-loop condition, and a push–pull converter, which is intended to boost the input voltage, operating under an open-loop condition. In the push–pull converter, the power switches, including the main switches and the rectifier diodes, operate under zero-voltage switching (ZVS) and zero-current switching (ZCS) at both switch off and switch on, which minimizes the switching loss. Furthermore, all of the parasitic parameters, such as the parasitic capacitance, leakage inductance, and magnetizing inductance of the main transformer, are fully utilized. Therefore, the presented topology benefits from fewer semiconductors but higher efficiency. The proposed topology produces less EMI noise because of ZVS and ZCS processes whose fundamental switching frequency interference is relatively low. The presented converter achieves a wide bus voltage regulation range in a satellite because of the pre-regulation of the buck cell. The theoretical analysis is validated by a prototype and its experimental results. The maximum efficiency of the converter can be up to 94.5%, and the high-voltage output is 7000 V.

A Proposed Single-Input Multi-Output Battery-Connected DC–DC Buck–Boost Converter for Automotive Applications

“…These converters encompass diverse isolation techniques, such as transformer-based [23] and coupled-inductor topologies [24], each accompanied by their distinct advantages and tradeoffs. Foremost among the benefits of isolated buck-boost converters is their competence in ensuring galvanic isolation, thus mitigating the risk of electrical shock and reducing the potential for ground faults [25][26][27]. The role of isolation extends to curtailing electromagnetic interference (EMI) and radiofrequency interference (RFI) by containing electrical noise within the converter, particularly invaluable in EVs housing sensitive electronic components and communication systems, necessitating a low-noise environment to ensure peak performance.…”