# A High Gain Modified Quadratic Boost DC-DC Converter with Voltage Stress Half of Output Voltage
## 1 Introduction
To overcome this issue, numerous different topologies have also been reported so far [21; 22; 23; 24; 25; 26; 27]. Additionally, the high gain boost converter can also be classified as isolated and non-isolated types. Normally, the isolated topology uses magnetic coupling (i.e., coupled inductor) between the source and load to provide the isolation [21; 22; 23; 24; 25]. Moreover, coupled inductor-based proposed converters are quietly very popular due to their capability for providing very high  
Figure 1: Application of integrated DC-DC converter for the next-generation energy system. voltage gain by changing the turn ratio, but an extra clamp circuit is needed to improve the system efficiency [28,29]. Moreover, though it increases the voltage gain a more precise magnetic design is also needed. In addition, in most of the reported coupled inductor-based boost converters, the authors have designed the magnetics by a 1:1 or sometimes 1:2 turn ratio [28]. Owing to having complexity, the overall cost is always increased for a coupled inductor-based configuration. Moreover, for high power applications, the resonant converter, mostly the LLC topology, has been showing its potential over recent decades. However, from the cost and control point of view, it is much more complex, and the complexity level increases when more switches are used for the possible application [26,27]. Another major drawback of the conventional boost and conventional quadratic boost converter is the voltage stress across the switching device, which is very high as the value of the stress voltage is exactly equal to the output voltage [29, 30, 31]. Many research groups have already proposed new techniques that can reduce the voltage stress up to a certain limit [32,33]. Although some reported results have reduced the voltage stress across the switch but in order to do that, in most cases, the converter lost its simple common ground feature [34,35]. So, the integration of more passive components with series and parallel inductors of quadratic boost topology is one of the potential solutions for non-isolated based QBC, which not only helps to increase the voltage gain with lower duty but also fulfills the general requirement by reducing the voltage stress across the switch including the easy control technique. Additionally, inductors dominated by VMC utilize more inductors (i.e., more than two inductors) which further increases the converter size [36]. In this study, a new, modified high gain quadratic boost converter is presented, which was constructed with consecutive mixed voltage boost cells. The proposed converter could be used in various applications where a non-isolated high gain DC-DC converter could be considered. It has various advantages over recently reported non-high gain DC-DC boost converters, which are listed as follows. 1. Using only a single switch, the high voltage gain is achieved, which is the first potential advantage over other reported studies where more switches have been used to boost the voltage level. 2. Another advantage is the control strategy which is generally very easy for a single switch-based topology. 3. The voltage stress across the power MOSFET switch of the proposed study is very low, which is half of the output voltage. The detailed circuit description of the proposed topology with the proper evolution process is discussed in the following section, and then the ideal and non-ideal voltage gain is calculated. After that, the design of the passive components and the efficiency calculation was conducted. In the later section, the comparison study was conducted, followed by the simulation and experiment results analysis. In the later section, the gain and phase plots are shown for stability analysis.