Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling W...Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling Wave Tube Amplifier(TWTA), a novel two-stage topology high voltage converter for TWTA is proposed.The converter is based on Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) resonant techniques. The high voltage converter operation principles are investigated and major features of the converter are discussed. The power switching mode of ZVS/ZCS is obtained. The experimental results show that the converter has good soft switching characteristics. Compared to the conventional hard switched Pulse Width Modulation(PWM) techniques, the high efficiency and low ripple of the converter for TWTA are realized. The efficiency of High Voltage Electronic Power Conditioners(HV-EPC) over 93.5% under the condition of 38~46 V input voltage and 260~300 W input power. The switching frequency of first-stage(preregulator) of HV-EPC is 89 k Hz and the switching frequency of second-stage(postregulator) is 44.5 k Hz. The highest output voltage of the HV-EPC is helix voltage which is about –6.8 kV. It is especially suitable for TWTA utilized in space satellite applications due to its high switching frequency and high power density.展开更多
该文分析了行波管放大器的输入输出曲线,并计算得到理想预失真线性化电路的增益和相位响应曲线。提出一种由两条非线性支路组成的预失真电路,并讨论了电路中肖特基二极管主要参数对预失真曲线的影响。设计制作了L波段预失真电路,并与行...该文分析了行波管放大器的输入输出曲线,并计算得到理想预失真线性化电路的增益和相位响应曲线。提出一种由两条非线性支路组成的预失真电路,并讨论了电路中肖特基二极管主要参数对预失真曲线的影响。设计制作了L波段预失真电路,并与行波管放大器联合测试,实验结果表明,加入预失真电路后,行波管放大器三阶交调载波比IM3在输入功率回退3 d B、6 d B、9 d B时分别从-10.3 d Bc、-14.3 d Bc、-18 d Bc改善到-12.1 d Bc、-18.5 d Bc、-26.9 d Bc。展开更多
文摘Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling Wave Tube Amplifier(TWTA), a novel two-stage topology high voltage converter for TWTA is proposed.The converter is based on Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) resonant techniques. The high voltage converter operation principles are investigated and major features of the converter are discussed. The power switching mode of ZVS/ZCS is obtained. The experimental results show that the converter has good soft switching characteristics. Compared to the conventional hard switched Pulse Width Modulation(PWM) techniques, the high efficiency and low ripple of the converter for TWTA are realized. The efficiency of High Voltage Electronic Power Conditioners(HV-EPC) over 93.5% under the condition of 38~46 V input voltage and 260~300 W input power. The switching frequency of first-stage(preregulator) of HV-EPC is 89 k Hz and the switching frequency of second-stage(postregulator) is 44.5 k Hz. The highest output voltage of the HV-EPC is helix voltage which is about –6.8 kV. It is especially suitable for TWTA utilized in space satellite applications due to its high switching frequency and high power density.
文摘该文分析了行波管放大器的输入输出曲线,并计算得到理想预失真线性化电路的增益和相位响应曲线。提出一种由两条非线性支路组成的预失真电路,并讨论了电路中肖特基二极管主要参数对预失真曲线的影响。设计制作了L波段预失真电路,并与行波管放大器联合测试,实验结果表明,加入预失真电路后,行波管放大器三阶交调载波比IM3在输入功率回退3 d B、6 d B、9 d B时分别从-10.3 d Bc、-14.3 d Bc、-18 d Bc改善到-12.1 d Bc、-18.5 d Bc、-26.9 d Bc。
