This paper studies the topology and control strategy of a hybrid power amplifier(HPA)based on modular multilevel converter(MMC)and linear power amplifier(LPA).The hybrid power amplifier can be directly connected to a high-voltage DC power supply,and it is easy to expand in capacity and has high reliability.In order to improve the efficiency and fidelity of the hy-brid power amplifier,the system integrated circuit model is established.The main factors affecting the output performance of the power amplifier are analyzed.The corresponding control method is proposed and design scheme of the control system is given.Final-ly,the feasibility of hybrid topology and the correctness of the control method are verified by simulation.Experimental results are presented to demonstrate the suitable performance of the output voltage waveform,and the aim of high efficiency and high fidelity is achieved.
关键词
混合功率放大器/模块化多电平变换器/线性功率放大器/高保真/高效率
Key words
hybrid power amplifier/modular multilevel converter/linear power amplifier/high fidelity/high efficiency
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