传统X线机稳压器的改进

Improvement of voltage regulator for traditional X-ray machine

目的:对传统X线机磁饱和稳压器进行改进,从而为X线管灯丝加热电路提供稳定的加热电压和电流,保证X线机产生的X线品质。方法:该电路包括稳压器输出电压采样电路、设定电压产生电路、控制电压产生电路、电源同步脉冲三角波信号产生电路、相位控制电路、可控硅工作电路以及稳压器输入电压采样电路。通过对稳压器输出电压的采样、检测、比较,进行负反馈控制,并与电源同步信号形成的三角波比较,产生控制可控硅的信号。通过调整可控硅导通角的方式,实现稳定稳压器输出电压的目的。结果:经过对设计电路进行组装、调试及在国产工频X线机上验证,可以实现对灯丝加热电路的稳压功能,同时交流电路中的波形畸变并不影响灯丝加热电路的正常工作。结论:该电路体积小、不发热、无噪声、工作稳定、稳压效果较好,可以替代传统的磁饱和稳压器。

Objective To improve the voltage regulator for the traditional X-ray machine to provide heating voltage and current to X-ray tube filament heating circuit. Methods The circuits included the ones for regulator output voltage sampling,desired voltage generation, control voltage generation, synchronous pulse triangular signal generation, phase control, siliconcontrolled rectifier(SCR) and regulator input voltage sampling. Negative feedback control was executed by the sampling,detection and comparison of the regulator output voltage, and the comparison was carried out with the synchronous pulse triangular signal to generate the signal for controlling SCR. The regulator output voltage was kept stable by regulating the modes of SCR conduction angle. Results Installing and debugging of designed circuit for domestic power frequency X-ray machine contributed to realizing voltage regulation for the filament heating circuit. The test also measured voltage waveform distortion in AC circuits, and this kind of adverse effect did not affect the filament heating circuit. Conclusion The improved system has small volume, low heat, little noise and high performance, which can replace the traditional MSVR.