Design Of A High-frequency High-voltage Power Supply For Dielectric Barrier Discharge

Plasma has many important features and is widely used in scientific research and industrial activities. It is getting more and more close to our daily life with the wide applications. At room temperature, dielectric barrier discharge is an important way to get non-thermal plasma. The high frequency power supply provides an alternate voltage to the dielectric barrier discharge reactor, causing a physical phenomena named field ionization, as a result getting plasma in the reactor. The frequency and amplitude of the power supply and the load all determine weather this physical phenomenon will be achieved and do have great effects to the characteristics of the whole discharge process.To find out the effect of the power performance to the discharge process, this paper put forward a specific power design base on high precision voltage adjustment and stable frequency control. The chopper circuit, voltage regulation module, voltage adjustment control strategy, inverter circuit, driving circuit, protection circuit, high-frequency transformer structure are selectively introduced. The coordination control between the voltage adjustment and frequency control is described in detail. Power supply consists of three parts. Voltage regulation part:can work with a input of single-phase 220V/50Hz voltage sourse; using OCC-PID controller to realize PWM control, chopping frequency 12.5 kHz, duty cycle 0-80%; can provide 0-200V DC voltage output. Inverter module:square wave output; using PLL control system to have stable frequency control, frequency for continuous adjustable from 100Hz to 25kHz; High-frequency transformer:rated power of lkW, working frequency from 10kHz to 25kHz; can cooperate with the inverter to achieve a high voltage output. In general, this power supply can provide 0-20kV,10kHz-25kHz AC voltage output with a rating power of 1kW. The modeling and analysis of the power with the help of Malab/Simulink is given and the results show that the design of the power supply can satisfy basic demand for dielectric barrier discharge.