This article addresses a single-stage bidirectional step-up inverter designed from the integration of a differential boost inverter and switched-capacitor (SC) cells. The conventional boost inverter, even being a step-up topology, presents a gain limitation due to losses, and therefore, does not fully attend the step-up specifications. The insertion of SC multiplier cells into it allows increasing its static gain without increasing the voltage stresses on its components. However, the resulting topology is nonlinear and contains a high amount of energy storage elements, which implies high-order models. In this article, static and dynamic analysis of the SC differential boost inverter is performed under different types of modulation. A generalized and reduced order equivalent circuit and a small-signal average model are proposed, as well as a static gain linearization technique that reduces the harmonic distortion of the output voltage, regulated in the closed loop by a resonant controller. This article also presents the main waveforms, equation, and a comparison between the differential boost inverter and its version with SC multiplier cells. To verify this study, a 250-W prototype of the rated power, input voltage of 60 V, switching frequency of 50 kHz, and the output voltage of 220 V is experimentally evaluated.

中文翻译：

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开关电容差分升压逆变器：设计、建模和控制

本文介绍了一种由差分升压逆变器和开关电容器 (SC) 单元集成而设计的单级双向升压逆变器。传统的升压逆变器，即使是升压拓扑，也会由于损耗而存在增益限制，因此，不能完全满足升压规范。将 SC 倍增器单元插入其中可以增加其静态增益，而不会增加其组件上的电压应力。然而，由此产生的拓扑结构是非线性的，并且包含大量的能量存储元件，这意味着高阶模型。在本文中，SC 差分升压逆变器的静态和动态分析是在不同类型的调制下进行的。提出了广义降阶等效电路和小信号平均模型，以及减少输出电压谐波失真的静态增益线性化技术，由谐振控制器在闭环中调节。本文还介绍了差分升压逆变器及其带有 SC 乘法器单元的版本之间的主要波形、方程和比较。为了验证这项研究，我们对额定功率为 60 V、开关频率为 50 kHz、输出电压为 220 V 的 250 W 原型进行了实验评估。