【摘要】 为了解决离子推进器屏栅电源在负载突变过程中产生的过压、过流等问题，对LLC谐振变换器采用移相-变频控制（PS-PFM）稳定输出电压，当采样电压低于设定值下限时，进入变频控制模式，当采样电压高于设定值上限时，进入移相控制模式。实验证明，相比于常用的调频控制，移相控制的加入能够解决轻载或空载模式下的电压飘高问题，通过PID参数的调整，可以实现负载跳变时的稳定快速调节，使输出电压保持在设定值；通过PCB布局与磁性元件优化设计，所研制的原理样机在额定情况下效率高达98.9%，功率密度可达6.47×10~6W/m~3，在同等级的电源产品中具有优势。更多还原

【Abstract】 In order to solve the problem of overvoltage and overcurrent in the process of load sudden change for ion thruster screen grid power supply,the phase shift pulse frequency modulation(PS-PFM)was used to stabilize the output voltage of the LLC resonant converter. When the sampling voltage is lower than the lower limit of the set value,it enters into the frequency control mode,and when the sampling voltage is higher than the upper limit of the set value,it enters into the phase shift control mode. The experiment proves that,compared with the common frequency control,the addition of phase shift control can solve the problem of high voltage drift in light load or no-load mode,and through the adjustment of PID parameters,it can achieve stable and fast adjustment when the load jumps,so that the output voltage remains at the set value. Through the PCB layout and magnetic components optimization design, the developed principle prototype efficiency reaches 98.9% under rated conditions,and the power density reaches 6.47 × 10~6W/m~3,which is advantageous in the same level of power supply products.更多还原