Multilevel Power Supply for High Efficiency RF Amplifiers
Multilevel Power Supply for High Efficiency RF Amplifiers
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DOI：
10.1109/tpel.2009.2033186
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
M. Vasić;Ó. García;J. Oliver;P. Alou;D. Diaz;J. Cobos
中科院分区：
文献类型：
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作者：
M. Vasić;Ó. García;J. Oliver;P. Alou;D. Diaz;J. Cobos
在无线电系统中，线性功率放大器(A类、B类或AB类)通常用作功率放大级的解决方案。这些放大器具有很高的线性度，但当传输信号的峰均功率比较低时，效率较低。卡恩包络消除和恢复(EER)技术用于提高射频发射机的效率，通过将高效率的非线性射频放大器(D类或E类)与高效包络放大器相结合，以获得线性和高效的射频放大器。本文提出了一种基于多电平变流器和线性调节器相结合的包络放大器的解决方案。该方案可以再现最大频谱分量为2 MHz的任意信号，瞬时最大功率为50W。效率测试表明，在传输平均值较低的信号时，它的效率比传统方案中使用的线性调节器高15%。此外，还对多电平变流器的电压电平选择算法进行了说明。
In radio systems linear power amplifiers (class A, B or AB) are usually used as a solution for the power amplifier stage. These amplifiers have high linearity, but suffer from low efficiency when the transmitted signal has low peak-to-average power ratio. The Kahn envelope elimination and restoration (EER) technique is used to enhance efficiency of RF transmitters, by combining highly efficient, nonlinear RF amplifier (class D or E) with a highly efficient envelope amplifier in order to obtain linear and highly efficient RF amplifier. This paper presents a solution for the envelope amplifier based on a combination of multilevel converter and linear regulator. The proposed solution can reproduce any signal with maximal spectral component of 2 MHz and give instantaneous maximal power of 50 W. The efficiency measurements show that when the signals with low average value are transmitted, it has up to 15% higher efficiency than linear regulator that is used as a conventional solution. Additionally, the algorithm for selection of voltage levels for the multilevel converter is explained, as well.