Design of EBW Stabilized High-Voltage Source Based on Fuzzy PID Control

A novel PWM-BOOST type EBW (electron beam welder) stabilized high-voltage source circuit system is introduced. This system consists of setting-up transformer, PWM-BOOST converter and a current limiter. PWM-BOOST converter can step up the voltage with the ratio higher than 1:5.5; as a result, the transformer´s output voltage is decreased and its structure can be simplified. Due to the strongly non-linearity and big signal working condition of the circuit system, conventional PID controller is very difficult to reach a satisfactory performance; therefore a fuzzy PID controller is developed to handle these difficulties. This fuzzy PID can automatically adjust the parameters according specific rules of the circuit´s characteristics. Considering that SABER is much more specialized and powerful in switched-circuit analysis whereas MATLAB is very powerful in control system design, a MATLAB-SABER co-simulation method is effectively used to design the fuzzy PID controller by elaborately establishing the SABER and MATLAB models and fuzzy algorithm. The simulation results show that this fuzzy PID controller has much higher control precision, better dynamic and static behaviors, favorable self-adaptive capability as well as easier realization hence is quite adequate in practical applications.