E类放大器的研究与仿真.doc

摘 要 在许多领域必须要求用大功率的射频电能，例如，特种材料熔炼，介质加热，等离子源，大功率发射机等。这就需要把直流电源转换为所需要的高频交流电源，功率放大器是转换过程中的重要装置，它正在朝着高频化，低功耗，高功率容量，高效率的方向发展。本课题的E类功率放大器用电子管作为开关元件，目的是提高放大器的效率和频率，同时获得较大的功率输出。 本文针对E类高频放大器的组成形式、工作原理和设计，计算方法进行了研究。 为了提高高E类高频功率放大器的效率，本文首先对E类高频功率放大器的电路结构和工作原理进行了分析，推导出了输出功率、效率和有关的电压电流的计算公式，以及负载网络参数的设计计算方法。 为了验证了设计的可行性，根据现有的条件用RPOTEL99Se对电子管E类功率放大器的进行了仿真，在电路仿真过程中优化了负载网络参数，达到最佳工作状态。最佳工作状态下效率为95%。 针对E类放大器的工作特性以及电子管的驱动特性，根据电子管栅极电压电流的特点，提出了驱动电路设计方案。对驱动电路的组成进行了理论分析，并设计出实际应用电路。经过实验，得到了理想的正弦波输出。 关键词:E类放大器;高频;大功率;电子管;效率 ABSTRACT The electrical energy with high-frequency and high power has been applied in many fields, such as high-frequency induction heating equipment,dielectric heating,plasma source,high power transmitter,ect... High-frequency and high power amplifier is necessary in converting the dc power to ac power.power amplifier is an important equipment in the transfer device,which has had a great development in the way of high frequency, low power loss, high power capability, high efficiency. In this subject vacuum tube is used as the switching component in the Class E power amplifier to get high output power with higher frequency. In this paper ,we made a research on structure form, operating principle and desigh calculating method of class E power amplifier. In order to improve the efficiency of class Epower amplifier, this paper circuit structure and operating principle were analyze. We deduced the calculating formula on output power, efficiency,voltage and circuit. Besides, the calculation for elements was used in class E power amplifier. To verify the feasibility of high-frequency class E power amplifier, according to existing conditions, circuit about class E power amplifier with vacuum tube has been simulated with PROTEL99se. In this simulating process, parameters in the load network have been optimized.The simulated circuit has reached optimum operation. The efficiency in simulation achieved 95%. We discussed and analyzed the phenomenon in the simulating proce