In this paper, a novel high-gain transformer-less dc–dc converter is presented. This topology is acquired by integrating two high-gain cells like quasi-Z source (QZ) and gain multiplier (GM) cells with a quadratic boost converter. The boosting factor of the proposed topology is increased both in the numerator and denominator of the voltage conversion ratio, which furnishes flexibility in designing the converter. The cost of the converter is low due to lesser voltage stress across the devices. Operating principle and steady-state analysis of the converter are analyzed in continuous conduction and discontinuous conduction modes. Considering the boundary conduction mode and voltage ripple, the design expression of the passive components is derived. A suitable duty cycle for realizing higher voltage gain is determined. The performance of the converter is analyzed and compared to those of similar QZ-based converters. To validate the theoretical study, a 50 W prototype is implemented and tested.

在本文中，提出了一种新颖的高增益无变压器DC-DC转换器。通过将两个高增益单元（如准Z源（QZ）和增益乘法器（GM）单元）与二次升压转换器集成在一起，可以获取此拓扑。所提出的拓扑的升压因子在电压转换比的分子和分母上均增加，这为转换器的设计提供了灵活性。由于器件两端的电压应力较小，因此转换器的成本较低。在连续导通和不连续导通模式下分析转换器的工作原理和稳态分析。考虑边界传导模式和电压纹波，推导了无源元件的设计表达式。确定用于实现更高的电压增益的合适的占空比。分析了转换器的性能，并将其与类似的基于QZ的转换器进行了比较。为了验证理论研究，实施并测试了50 W原型。