Trans Z‐source‐based half‐bridge inverter: A method for achieving high voltage gain

Abstract

This article offers a modified trans Z-source-based half-bridge inverter topology. A suitable pulse width modulation (PWM)-based control method is applied on the proposed inverter. Regarding this control technique, the state of switches in each of the operational states is obtained, and their equivalent control circuits are demonstrated and examined in depth. With the help of the results of these analyses, the boost factor for the proposed structure can be calculated. Additionally, the necessary equations for designing the passive components, as well as the power ratings of the active components, are found.Then, in order to evaluate the advantages and disadvantages of the proposed topology, a comparative study is conducted in several aspects, including the boost factor, the voltage stresses on capacitors, and the voltage stresses on passive devices. This comparison demonstrates that the proposed topology provides a high boost factor while minimizing voltage stresses on the devices, resulting in a smaller volume and size and a lower cost. Once the proposed topology has been thoroughly analyzed, the total power losses and the percentages of power losses consumed by each component device are calculated to obtain efficiency. Finally, an experimental prototype based on the equations for passive and active components is developed. Experiments are used to verify the validity of the proposed topology and the accuracy of the equations.

A family of Z‐source‐based half‐bridge inverters: Topology derivation

“…Different Z-source-based half-bridge topologies have been presented in [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Considering these topologies, it can be deduced that the structures in which coupled inductors are utilized can provide a higher boost-factor than their counterparts.…”

“…Nonetheless, the conditions for all of the topologies are considered the same, so if there are two DC voltage sources in a structure with a magnitude of V i , the extent of the DC voltage source will be equal to 2V i in a topology with a single voltage source. These structures are presented in [14][15][16][17][18][19][20][21][22][23][24][25][26][27], where the existing topologies in [14][15][16][17][18][19][20] do not comprise coupled inductors, whereas the existing structures in [21][22][23][24][25][26][27] contain this device. Moreover, coupled inductors utilized in topologies in [23] and [24] are Γ-shaped, while the others include T-type coupled inductors.…”

“…Moreover, coupled inductors utilized in topologies in [23] and [24] are Γ-shaped, while the others include T-type coupled inductors. Furthermore, the presented structures in the literature show that the topologies of T-I, T-III, and T-IV have been presented in [25][26][27], respectively.…”

“…Concerning these topologies, it can be seen that they do not have a common ground between their input voltage sources and the output load. However, it is important to notice that it is the typical case in other similar topologies [14–27].…”

“…However, conventional Z-source inverters can offer an output voltage with a much lower frequency. In [14][15][16][17][18][19][20][21][22][23][24][25][26][27], different examples of Z-source-based half-bridge inverters are suggested, and their features will be analyzed.…”