模拟伺服功率放大器的研究

本文ID：5613

字数:20707,页数:41

论文编号:ZD244 此份包含答辩PPT。论文字数:20707,页数:41

摘要

针对目前功率放大器所存在的效率与电磁兼容不相融合的矛盾，分析了模拟伺服功率放大器的系统结构、性能和特点，提出了一种高效、低功耗、低电磁干扰、对环境污染少的模拟伺服功率放大器的设计方法，并进行了系统的MATLAB仿真，在理论上证明了该功率放大器控制系统的可行性和可靠性。
采用电源输出电压随功放管管压降偏差和输入信号变化而随动的方法，来实现功放管管压降的恒定，从而实现了功率放大器的高效率与低功耗。基于对模拟伺服功率放大器性能指标的要求，我们采用谐振变换电路与可控硅整流电路相结合的方法来构造伺服电源。为了避免电磁、射频干扰所产生的环境污染问题，伺服电源采用过零触发整流方式。

关键词：模拟伺服功率放大器；伺服电源；可控硅整流；过零触发

STUDY ON ANALOG SERVO POWER AMPLIFIER
Abstract

In order to solve the contradiction between efficiency and EMC(Electro-Magnetic Compatibility) of the power amplifier thoroughly, and to reduce the power dissipation and environment pollution , a compact and applied power amplifier with high power and low EMI (Electro-Magnetic Interference) has been developed. The structure of analog servo power amplifier has been constructed and its principle and characteristic has been analyzed. At the same time system MATLAB simulation has been done; the feasibility and the reliability of the power amplifier control system has been confirmed theoretically.
The supply voltage for the output stage of the amplifier is varied with the input signal and the error between the power amplifier tube and the hoped value, so that the voltage applied to the active output transistor is held small and constant. The power dissipation of power amplifier is reduced and amplifier efficiency is raised appreciably. Based on the requirements to the performances of the analog servo power amplifier, resonant transformation network is used to produce high-frequency sine wave to supply silicon-controlled rectifier. To prevent environment pollution from Electro-magnetic interference and radio–frequency interference, the zero cross triggering is adopted to proceed rectified controllably.

Key words: Analog servo power amplifier； Servo-supply； Silicon-controlled rectifier； Zero-cross trigger

摘要…………………………………………………………………………I
Abstract……………………………………………………………………..II
第1章绪论……………………………………………………………….. 1
1.1功率放大器的发展及现状…………………………………………….. 1
1.2模拟伺服功率放大器研究的目的和意义………………………………. 4
1.2.1课题研究的目的……………………………………………….. 4
1.2.2课题研究的意义……………………………………………….. 5
1.3 课题主要研究内容……………………………………………………7
第2章模拟伺服功率放大器控制系统…………………………………..8
2.1模拟伺服功率放大器的系统结构………………………………………8
2.1.1控制系统方案的确定……………………………………………8
2.1.2控制系统结构的推导……………………………………………9
2.2控制系统传递函数的推导……………………………………………..10
2.2.1控制系统组成环节的传递函数…………………………………..11
2.2.2控制系统的传递函数…………………………………………....13
2.3 系统仿真……………………………………………………………. 17
    2.3.1控制系统MATLAB计算及仿真………………………………... 17
    2.3.2动态系统的Simulink仿真……………………………………....18
    2.3.3控制系统参数的选择…………………………………………....20
2.3.4控制系统的仿真………………………………………………..21
2.4小结…………………………………………………………………..27
第3章伺服电源的构造…………………………………………………...28
3.1伺服电源的构成……………………………………………………….28
3.1.1 概述……………………………………………………………28
3.1.2 伺服电源的构成………………………………………………...29
3.2伺服电源的实现……………………………………………………….35
    3.3小结…………………………………………………………………..37
结论………………………………………………………………………….38
致谢………………………………………………………………………….39
参考文献…………………………………………………………………….40