When the load changes

there are many problems in the traditional short arc power supply

such as the large power tube switch's impact

the overshoot of the output voltage waveform

the poor stability when the voltage amplitude is adjusted and so on. In order to solve these problems

a short arc machining pulse power supply based on double closed loop PI control scheme is designed. The power supply combines the traditional hardware PI closed-loop control and digital PI closed-loop control

to achieve the subsection PI

double closed loop control. The design of the main circuit of the power supply is based on the two stage modulation. The MATLAB simulation and the experimental results show that

compared with the traditional hardware PI closed-loop control mode

the overshoot and overshoot time of the output voltage waveform of the new type of short arc machining pulse power supply are reduced by using the double closed loop PI control scheme

and it has better steady-state and dynamic characteristics. The experimental results of short arc milling show that the utility model has the advantages of stable and reliable output and good output performance when the adjustable electric parameters are voltage value 10-30 V

duty cycle 30%-90%

frequency 200 Hz-800 Hz. Using these parameters the quality of short arc machining is good.