Class of high boost inverters based on switched‐inductor structure

Abstract

This study deals with a class of the switched-inductor boost inverters (SLBIs) including the DC-linked type, continuous, discontinuous and ripple input current topologies. Compared with the conventional switched boost inverters, the SLBIs add only three diodes and one inductor to obtain a strong boost factor. In comparison with the conventional switched-inductor Z-source inverters (ZSIs) for the same voltage gain at the same modulation indexes, the proposed SLBIs use one more active switch and less passive components which results in reducing the size and cost. Moreover, the efficiency of the proposed inverters is improved in comparison with the conventional switchedinductor ZSIs. Analysis and operating principles are presented. A laboratory prototype was built with 24, 36, 48 V DC input and 127 Vrms output voltage to test high boost ability of the proposed inverters.

Maximum Boost Control Method for Single-Phase Quasi-Switched-Boost and Quasi-Z-Source Inverters

“…Compared to ZSI, qZSI improves the input current and reduces the capacitor voltage rating. Like ZSI/qZSIs, switched-boost inverters (SBIs) [20][21][22][23][24][25][26] also use the shoot-through time interval to achieve single-stage power conversion with buck-boost characteristics and improve reliability. In comparison with ZSIs, SBIs use one more active switch and fewer passive components [20].…”

“…Quasi-switched boost inverters (qSBIs) [23,24] overcome the shortcomings of conventional SBIs by improving the profile of the input current and reducing the voltage stress of the capacitor. In [25], the concept of a switched inductor is applied to the SBI topologies to improve the boost factor. Compared to conventional SBIs, switched-inductor boost inverters [25] add only three diodes and one inductor to produce a high step-up DC-link voltage.…”

“…In [25], the concept of a switched inductor is applied to the SBI topologies to improve the boost factor. Compared to conventional SBIs, switched-inductor boost inverters [25] add only three diodes and one inductor to produce a high step-up DC-link voltage. The active switched-capacitor/switched-inductor qZSIs presented in [26] are also based on switched-inductor boost inverter topologies [25].…”

“…Compared to conventional SBIs, switched-inductor boost inverters [25] add only three diodes and one inductor to produce a high step-up DC-link voltage. The active switched-capacitor/switched-inductor qZSIs presented in [26] are also based on switched-inductor boost inverter topologies [25]. Because a shoot-through interval is also applied to SBIs to boost the DC-link voltage, the PWM control strategy used for SBIs is the same as that used for ZSIs.…”

Neutral-point Potential Balancing Method for Switched-Inductor Z-Source Three-level Inverter

“…Switched-inductor (SL) Z-source impedance network is derived by replacing the two inductors in the traditional network with two SL cells to obtain higher voltage boost factor. Several topologies based on SL Z-source impedance network are investigated in literatures [7][8][9]. However, the SL Z-source three-level NPC inverter has not attracted much attention from researchers.…”