Soft-switching buck inverter
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ORIGINAL ARTICLE
Soft‑switching buck inverter Wei Xu1 · Xiaohua Wu1 · Feng Hong2 Received: 24 March 2020 / Revised: 19 October 2020 / Accepted: 21 October 2020 © The Korean Institute of Power Electronics 2020
Abstract The soft-switching buck inverter, which is mainly applied to solve the contradictions between the switching frequency and the shoot-through problem along with the dead-time effect, is proposed in this paper. A detailed analysis of the relationship between the range of the duty ratio to realize soft-switching as well as the additional voltage stress and the current stress is conducted. In addition, a 1 kW prototype is designed and established. Results of simulations and experiments verify the validity of the theoretical analysis. Furthermore, the proposed soft-switching buck inverter has a strong practical significance in situations where medium and high power outputs are required. Keywords Soft-switching · Buck · Inverter · Shoot-through
1 Introduction With the advantages of an increased power density, improved dynamic response and reduced magnetic component losses, research on increasing the switching frequency of inverters has received a great deal of attention. Inverters with an increased switching frequency have a wide range of application in situations such as active filters [1], reactive power compensation [2], new energy power generation [3], variable frequency speed regulation [4], and locomotive traction [5]. To increase the switching frequency, the issue of increased switching loss must be taken into consideration. Meanwhile, the soft-switching technology is the most dominant solution. Nowadays, the technologies of resonant DClink-type soft-switching inverters [6–10] and resonant commutated pole soft-switching inverters [11–18] have made considerable advances and are still in progress. However, limitations still exist on the increase of switching frequency, where shoot-through problems and dead time are major factors. The soft-switching inverter is in essence an extension of the bridge-type inverter. The shoot-through problem is a * Feng Hong [email protected] 1
School of Automation, Northwestern Polytechnical University, Xian, China
College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2
major threat to the reliability, which must be avoided by setting a dead time. However, the dead-time effect is one of the main factors that contribute to output distortions [19]. With improvements in the switching frequency, the proportion of dead time increases, which leads to a poorer output performance. Although scholars have carried out a great deal of research on dead time compensation strategies, most of these studies are targeting low-switching-frequency situations, where the dead time is in a small proportion [20]. When the switching frequency is increased, the dead time should be reduced and the resonant time should be controlled more precisely. Consequently, the requirements in terms of testing capacity and paramete
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