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本文讨论雷达发射机中用的一种行波管电源的设计,这种发射机主要要求射频输出的相位稳定。在工作比为2％时,其峰值输出功率为15kW。为了满足相位稳定度的要求,行波管阴极至管体(对地电压为25kV)和阴极至集电极(15kV)的电源上脉冲至脉冲的纹波必须分别保持低于3Vpp和80Vpp。纹波是由电源的开关频率、电网电压变化以及雷达脉冲重复频率变化(参差)引起的。本文叙述了用来减小上述电源电压上的纹波的开关电路和技术, 采用SPICE 2 CAD软件包对这种设计进行了分析,特别把重点放在文献〔1〕和〔2〕中提出的设计模型,以便对本计划所采用的开关电路和集成电路调整器作仿真。
This article discusses the design of a traveling-wave tube power supply used in radar transmitters that mainly require the phase of the RF output to be stable. At 2% duty cycle, the peak output power is 15kW. In order to meet the requirements of phase stability, the pulse-to-pulse ripple from the cathode of the traveling wave tube to the tube (25 kV to the ground) and from the cathode to the collector (15 kV) must be kept below 3 Vpp and 80 Vpp respectively. Ripple is caused by the switching frequency of the power supply, the change of the grid voltage and the change of the repetition frequency of the radar pulse (variable). This article describes the switching circuits and techniques used to reduce the ripple on the supply voltages described above, using the SPICE 2 CAD software package to analyze this design, with special emphasis on the proposed in [1] and [2] Design the model to simulate the switching and integrated circuit regulators used in this project.