Study And Design Of Power Supply Used In Dielectric Barrier Discharge

The application of low-temperature plasma technology has a vast prospect in industry, and its related fields include environmental, materials and energy, etc. Dielectric barrier discharge at atmospheric pressure is an effective way to produce low-temperature plasma. The high-frequency and high-voltage power supply is the main component to generate dielectric barrier discharge. The effect of plasma produced by DBD is closely related to voltage, frequency and other parameters of the power supply. Therefore, we developed a kind of high frequency and high voltage power supply for dielectric barrier discharge.The parameters of the power supply were chosen as follows: the input of single-phase was 220V 50Hz AC; the voltage of output was 0-20 kV (maximum value), which can be adjusted; the frequency of output was 50Hz-25 kHz, which can be adjusted; LCD display.Firstly, this paper presented the principles of the hardware design, the components of the circuit, including the rectifier circuit, filter circuit, the DC chopper circuit, the inverter circuit, drive and control circuit, measuring circuit and output circuit, etc, were designed and analyzed in detail. We used Boost chopper circuit to achieve voltage regulation function. The inverter circuit topology applied the form of full-bridge inverter, and intelligent power module IPM was adopted as power conversion device, which improved the reliability of the circuit. The signal of PWM was generated by the drive circuit composed of the chips SG3525. AVR microcontroller was used for Power control circuit as the core composition, applied PID control algorithm to stabilize the output voltage. LCD 12864 module was used for Digital display.Secondly, this paper presented the software design process of the power supply. The MCU software program was written by ICCAVR, and its download working process was given. The control algorithms of the power supply were analyzed in detail, part of the subroutine program flow chart and the C language program were given. Finally, based on the theory of the hardware and the software design, simulations and experiments of the power supply were conducted. In this paper, Saber and Proteus were used to achieve the power supply circuit simulation, auxiliary circuit parameters design and selection, and program running verification. The power supply was tested in DBD by combining with two different dielectric barrier discharge generators. The related experimental data and wave forms were given and analyzed. The result indicated that the designed power supply met the performance demands, and was successful in using the power supply for the experiment of DBD.