通过对高频逆变器前端DC-DC的升压PWM调制和后端DC-AC的SPWM调制的研究,提出了利用FPGA结合DDS技术来实现逆变器的控制电路集成化,并采用模数混合信号F P G A集成了闭环控制的反馈控制电路,从而简化设计,提高系统的稳定和可靠性。本设计...通过对高频逆变器前端DC-DC的升压PWM调制和后端DC-AC的SPWM调制的研究,提出了利用FPGA结合DDS技术来实现逆变器的控制电路集成化,并采用模数混合信号F P G A集成了闭环控制的反馈控制电路,从而简化设计,提高系统的稳定和可靠性。本设计中,重点在于外围功率电路部分前端升压的高频变压器的设计以及输出端L C滤波电感与电容的选取,需要综合考虑频率特性、功率因数来选取合适的材料和数值。展开更多
Amplitude quantization is one of the main sources of spurious noise frequencies in Direct Digital Frequency Synthesizers (DDFSs), which affect their application to many wireless telecommu- nication systems. In this pa...Amplitude quantization is one of the main sources of spurious noise frequencies in Direct Digital Frequency Synthesizers (DDFSs), which affect their application to many wireless telecommu- nication systems. In this paper, two different kinds of spurious signals due to amplitude quantization in DDFSs are exactly formulated in the time domain and detailedly compared in the frequency do- main, and the effects of the DDFS parameter variations on the spurious performance are thoroughly studied. Then the spectral properties and power levels of the amplitude-quantization spurs in the absence of phase-accumulator truncation are emphatically analyzed by waveform estimation and computer simulation, and several important conclusions are derived which can provide theoretical support for parameter choice and spurious performance evaluation in the application of DDFSs.展开更多
文摘通过对高频逆变器前端DC-DC的升压PWM调制和后端DC-AC的SPWM调制的研究,提出了利用FPGA结合DDS技术来实现逆变器的控制电路集成化,并采用模数混合信号F P G A集成了闭环控制的反馈控制电路,从而简化设计,提高系统的稳定和可靠性。本设计中,重点在于外围功率电路部分前端升压的高频变压器的设计以及输出端L C滤波电感与电容的选取,需要综合考虑频率特性、功率因数来选取合适的材料和数值。
基金Supported by National High-Technology Research and Development Plan of China (Grant No.2006AA01Z452)
文摘Amplitude quantization is one of the main sources of spurious noise frequencies in Direct Digital Frequency Synthesizers (DDFSs), which affect their application to many wireless telecommu- nication systems. In this paper, two different kinds of spurious signals due to amplitude quantization in DDFSs are exactly formulated in the time domain and detailedly compared in the frequency do- main, and the effects of the DDFS parameter variations on the spurious performance are thoroughly studied. Then the spectral properties and power levels of the amplitude-quantization spurs in the absence of phase-accumulator truncation are emphatically analyzed by waveform estimation and computer simulation, and several important conclusions are derived which can provide theoretical support for parameter choice and spurious performance evaluation in the application of DDFSs.
