用回扫变压器赋能的光导开关功率辐射系统

High-power Radiation System with PCSS Acting as the Photoconductive Switch and a Scanning-back Charging Transformer

为了达到回扫脉冲调制器的预期指标,计算了相关参数;说明了选择回扫调制器作为脉冲高压电源的原因。该脉冲调制器可提高单个光导开关的耐压、寿命和天线的辐射功率,同时因该脉冲调制器体积小,重量轻,可将其和光导开关辐射系统组合为一个子系统组合,各个子系统组合再组成天线阵系统,提高了天线阵的辐射能量.

Photoconductive switching in a semiconductor has unique advantages for controlling electricalenergy in the time frame required for microwave power generation. Scanning back charging switch power supply has good characteristics, such as little volume, lightweight, so it is used in single Photo-Conductive Semiconductor Switch （PCSS） radiation system. In the absence of light, PCSS is a good insulator, capable of sustaining electric fields approaching 200 kV/cm. When laser comes on, PCSS turns on and antennas radiate. Input voltage of the pulse power supply varies from 30V to 220V and the maximum output voltage is 30 kV. Some parameters are calculated according to the requirements of the pulsed power supply. This kind of solid-state pulsed power modulator has provided the necessary of high voltage and achieved long PCSS lifetimes. Scanning back charging transformer is designed in detail. Overall considerations place specific requirements upon packaging approaches. High voltage designs are optimized with large spacing and rounded conductor edges. Planar layouts is selected to give microwave design the highest priority dimension considerations and we rely on the dielectric strength of high quality Teflon substrate accommodates high voltage aspects. Some coaxial geometries, which have inherently less conflict between high voltage and microwave design rules, result in excellent high frequency performance.