论文部分内容阅读
根据微型X射线管的特点,设计了基于推挽电路和闭环反馈电路的灯丝驱动电源。采用了UCC3808脉宽调制(Pulse Width Modulation,PWM)控制芯片产生两路相位相反的PWM信号,并经由UCC37324金属氧化物半导体(Metal-Oxide-Semiconductor,MOS)管大电流驱动器提高驱动效率,实现推挽结构的后端驱动电路。闭环反馈电路的设计采用精密电阻将管电流的信号转换为等比例的电压信号引入到反馈环节,通过系统自身的闭环控制实现管电流的恒定,并保持高效率和低功耗。实验首先通过外接1.5?的功率电阻测量系统功率,测得输入功率为11 W,效率超过80%,符合灯丝电源的功耗指标要求;然后连接实际的X光管灯丝,经测试可正常工作,管流稳定度为0.227%。
According to the characteristics of the miniature X-ray tube, a filament-driven power supply based on a push-pull circuit and a closed-loop feedback circuit is designed. UCC3808 pulse width modulation (PWM) control chip is used to generate two PWM signals with opposite phases and the drive efficiency is increased through the UCC37324 Metal-Oxide-Semiconductor (MOS) tube high-current driver Pull the structure of the back-end drive circuit. The design of closed-loop feedback circuit uses the precision resistor to convert the signal of the tube current into an equal-proportion voltage signal to be introduced into the feedback link, and the tube current is kept constant through the closed loop control of the system, maintaining high efficiency and low power consumption. The experiment first measured the system power through an external 1.5Ω power resistor, measured the input power of 11 W, the efficiency of more than 80%, in line with the power requirements of the filament power requirements; then connect the actual X-ray tube filament, the test can work properly, Tube stability is 0.227%.