一种宽脉冲高重频浮动板调制器的设计

浮动板调制器具有输出波形好、功率小、电压较低、波形变化灵活等特点,在中小功率控制极微波管中被广泛应用。介绍了一种采用功率MOSFET串联组成调制开关的应用于行波管发射机的40kHz/2kV固态浮动板调制器的设计,对调制器的电路拓扑进行了简要的概述,对调制器的关键器件即MOSFET开关管的选择、宽脉冲传输、开关管的驱动电路、调制器的保护电路及散热/绝缘设计等进行了较为详细的介绍。还就调制器抗打火设计进行了分析。最后给出了调制器的测试波形。

Design of a Wide-Pulse and High-Frequency Floating Deck Modulator

Floating deck modulator（FDM） has many advantages such as perfect output wave, low pow- er, low voltage, and flexible wave variety. So it is widely used in middle and small power microwave tube. A solid state 40 kHz/2 kV floating deck modulator for travelling-wave tube transmitter using series power MOS- FETs as the modulating switches is described in this paper. The modulator circuit topology is briefed. The selection of MOSFET switching transistor which is the key part of the modulator, the wide pulse transmis- sion, the driving circuit of switching transistor, the protection circuit for the modulator, and the cooling/in- sulation design are introduced in detail. The design against high-voltage sparking is also analysed. In the end, the modulation wave results are given.