Research And Design Of High Frequency And High Voltage Power Supply Of DBD Type Ozone Generator

Because of non-polluting, low hazard, green, ozone has been received increasingly attention and widely used in various industry fields. However, due to the immature preparation of ozone technology, the current domestic use of ozone generator power supply usually uses power frequency power through the transformer to boost the scheme or the low hard-switching power factor inverter technology open loop scheme, which makes the ozone generator the power supply system has the very low efficiency and poor immunity shortcomings. Therefore, the research on the problems in the application of the ozone generator has great value.In this paper, the 30kW/11kHz high-frequency and high voltage power supply ozone generator is the research object, and the dielectric barrier discharge method (DBD:Dielectric Barrier Discharge) generation technology is used to improve the production of ozone. For problems of the low productivity and poor anti-interference ability of power supply system, the frequency of automatic tracking, the closed loop power control and the soft switch technology are studied. Firstly, a DSP-based (TMS320F28035) phase shift PWM is designed to determine three-phase uncontrolled rectifier, full-bridge IGBT inverter and a series resonant load discharge chamber as the main circuit ozone generator power. Secondly, a combination of the closed-loop control strategy PID (proportional-integral-derivative control) and DPLL (digital phase locked loop) closed control scheme is used to model and simulate the ozone generator power system on the MATLAB/SIMULINK platform. Next, based on the simulation, the design of a control system which has the driving circuits and related hardware circuit is realized, and the TMS320F28035 is the core of the control system. Then, by collecting the terminal voltage and current signal in the load discharge chamber and designing modular TMS320F28035 chips, a PWM control pulse 4 with a dead zone, the software phase-locked loop, PID controlled phase PWM power regulation, fault diagnosis process design software program are respectively achieved, and the integrated debugging is operated in the experimental platform. Finally, the circuit testing hardware and software testing of the entire ozone generator inverter are processed. The hardware circuit tests power system various functional modules, and the software functional tests the PWM pulse waveform, the waveform frequency tracking, the phase-shifted PWM control inverter bridge output voltage and current waveforms, the load output test voltage and output current waveform, and the entire ozone generator power system.The simulation and experimental results show that the scheme achieves a soft-switch technology, automatic frequency tracking and automatic power adjustment, improves the power factor ozone generator power system, solves the problem of high energy consumption of the power supply system, and ensures the stability and reliability of the ozone generator power system.