Exact Analysis of Class DE Amplifier with FM and PWM Control
Exact Analysis of Class DE Amplifier with FM and PWM Control
复制标题
具有FM和PWM控制的DE类放大器的精确分析
DOI：
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发表时间：
2003
影响因子：
0.7
通讯作者：
S. Mori
中科院分区：
文献类型：
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作者：
H. Sekiya;I. Sasase;S. Mori
DE类放大器的控制是一个重要的问题，因为当负载电阻从初始设计值变化时，其开关操作不满足E类开关条件。为此，提出了几种DE类放大器的控制方案。然而，通过使用这些控制的输出电压和电力转换效率的变化只能通过实验测量，因此，它们不能在理论上被发现。本文对采用FM和PWM控制的DE类放大器进行了精确的分析。通过分析，可以从理论上推导出输出电压、功率转换效率等参数，并且可以得到当负载电阻或输入电压变化时，保持输出电压恒定的频率和占空比。我们指出，理论预测是类似的实验结果定量。在1.0MHz、1.8W输出下，效率超过94%。
SUMMARY The control of class DE amplifier is an important problem since its switching operations do not satisfy class E switching conditions when the load resistance varies from the initial designed values. Therefore,several of control schemes of class DE amplifier were proposed. However,the changes of the output voltage and the power conversion efficiency by using these controls can be measured only experimentally and thus,they cannot be found theoretically. In this paper,an exact analysis of class DE amplifier with FM and PWM control schemes is presented. From the analysis,we can theoretically derive the output voltage,the power conversion efficiency and so on. Moreover,the frequency and the duty ratio to keep the constant output voltage can be found when the load resistance or the input voltage varies. We indicate that the theoretical predictions are similar to the experimental results quantitatively. The measured efficiency is over 94% with 1.0 MHz and 1.8 W output.