中图分类号： TN78；TG439.9 文献标识码： A DOI：10.16157/j.issn.0258-7998.201274 中文引用格式： 王壮，许海鹰，桑兴华，等. 20 kHz脉冲偏压控制系统设计[J].电子技术应用，2021，47(9)：96-100，110. 英文引用格式： Wang Zhuang，Xu Haiying，Sang Xinghua，et al. The design of 20 kHz pulse bias voltage control system[J]. Application of Electronic Technique，2021，47(9)：96-100，110.
The design of 20 kHz pulse bias voltage control system
Wang Zhuang1，Xu Haiying1，Sang Xinghua1，Yang Bo1，Zhang Wei2
1.Science and Technology on Power Beam Generator Laboratory，AVIC Manufacturing Technology Institute，Beijing 100024，China； 2.School of Mechanical Engineering and Automation，Beijing University of Aeronautics and Astronautics，Beijing 100191，China
Abstract： In order to improve the molding quality of the electron beam fuse additive，a 20 kHz pulsed bias voltage control system was developed based on the principle of the bias voltage to adjust the beam current. Through in-depth analysis of its working environment, it selects high-speed DSP digital processing chip to realize the conversion of pulse beam base value, peak value to bias voltage base value and peak value. According to the input pulse frequency and duty cycle, the pulse beam output can be adjusted; and through the PWM generator chip, the fundamental wave above 100 kHz is output, and the DSP outputs the pulse synthesis mode, and then through the high-power operational amplifier, the base value, and the peak value series rectifier circuit, the pulse bias output can be obtained, and then the pulse beam output is regulated, so as to achieve a drop-by-pulse control mode.
Key words : fuse additive manufacturing；bias voltage power supply；pulse beam current