This article presents a flying-capacitor linear amplifier (FCLA) that achieves high efficiency, low harmonic distortion, and low electromagnetic interference (EMI). A conventional class-B linear amplifier cannot be used in power conversion applications, because the power loss generated in active-state MOSFETs is high compared with the loss generated in switching operations. In the proposed FCLA, multiple series-connected MOSFETs are used, and only one MOSFET operates in the active state at a time. Thus, the power loss generated in the MOSFETs can be reduced, and the FCLA can achieve high efficiency without performing the switching operation. In this study, the features of the FCLA and conventional linear amplifiers are theoretically compared and evaluated. Moreover, a voltage balancing control for flying capacitors is proposed and verified through simulations and experiments. It is demonstrated that the prototype 12-series FCLA achieves over 89% efficiency and generates low harmonics and low EMI. The proposed configuration is useful for increasing the number of series MOSFETs, and it contributes to realizing a power converter with advantages such as low harmonic distortion, low EMI, and high efficiency.

中文翻译：

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具有电容电压平衡的飞电容线性放大器，可实现高效率和低失真

本文介绍了一种具有高效率、低谐波失真和低电磁干扰 (EMI) 的飞电容线性放大器 (FCLA)。传统的 B 类线性放大器不能用于功率转换应用，因为与开关操作中产生的损耗相比，有源 MOSFET 中产生的功率损耗较高。在提议的 FCLA 中，使用了多个串联连接的 MOSFET，并且一次只有一个 MOSFET 工作在活动状态。因此，可以减少 MOSFET 中产生的功率损耗，并且 FCLA 可以在不执行开关操作的情况下实现高效率。在这项研究中，FCLA 和传统线性放大器的特性在理论上进行了比较和评估。而且，提出并通过仿真和实验验证了飞跨电容器的电压平衡控制。经证明，原型 12 系列 FCLA 实现了超过 89% 的效率并产生低谐波和低 EMI。所提出的配置有助于增加串联 MOSFET 的数量，有助于实现具有低谐波失真、低 EMI 和高效率等优点的功率转换器。