Improving the Quasi Resonant DC Link in the Voltage Inverter; Studying the Losses and Designing the Control Circuits

Mojtaba Forooghi, Pezhman Aghaei

Abstract


One of the fundamental structures of inverters with soft switching is the use of quasi-resonant DC link (QRDCL) circuits, in which element switching occurs in the zero voltage (ZVS) and / or zero current (ZCS) conditions and also the use of pulse width modulation (PWM). One of the indices of distinction and superiority of these converters is losses in the QRDCL circuit, less losses, and the increase of converter’s frequency. This paper aims to calculate losses of the QRDCL and the design control circuits of improved QRDCL voltage inverter.

In this regard, at first, the benefits of soft switching and general characteristics of various types of topologies used in inverters with soft switching is studied and then, the desired improved inverter with the capability of EDPWM (Enhanced Double PWM) which uses the single-phase soft switching technique (SPSS) is introduced. For proper functioning of the circuit, a particular type of the sinusoidal pulse width modulation (SPWM) is used, which its characteristics is studied and then the desired control circuit inverter is proposed. Finally, the full simulation of the inverter is conducted and the obtained results of analyzing the functionality of the circuit and mathematical equations governing the circuit are compared with the results come from computer simulation.

提高了電壓型逆變器的準諧振直流環節;學習的損失和設計控制電路


摘要

一個用軟開關的逆變器的基本結構是採用準諧振DC鏈路(QRDCL)電路,其中元件開關在零電壓(ZVS)和/或零電流(ZCS)的條件下,也使用發生脈衝寬度調製(PWM)。一個區分及這些轉換器的優勢的指標是在QRDCL電路,較少的損失,並且轉換器的頻率的增加的損失。本文旨在計算QRDCL和改進QRDCL高壓變頻器的設計控制電路的損失。

在這方面,在第一,軟交換和各種類型的與軟開關的逆變器中使用的拓撲結構的一般特徵的好處進行了研究,然後,用EDPWM(增強雙PWM)的能力所需要的改進的變頻器,它使用單引入相軟開關技術(SPSS)。對於電路的正常工作,所述正弦脈衝寬度調製(SPWM)的特定類型的使用,其特徵是研究,然後將所需的控制電路逆變器提出了。最後,逆變器的全仿真中進行和分析電路的功能的管理的電路中的所獲得的結果和數學方程進行比較的結果來自計算機模擬


Keywords


Inverter, Soft switching, QRDCL, PWM, Losses, EDPWM, SPSS

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References


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