Research And Design Of High-voltage DC LCC Resonant Converter Used For Electrostatic Precipitation

The traditional power-frequency, high-voltage electrostatic pre--cipitator can not meet user's needs, because there were some problems such as the large volume of power supply, the low efficiency and the serious pollution on the grid. High-frequency high-voltage electrostatic precipitator attracted a wide spread attention and scholar's research interests because of the absence of those defects.By carefully studying the LCC resonant converter technology and making a detailed analysis of the LCC resonant converter's operation mode, the thesis proposed a linear approximation analysis method with a wide scope of application and good accuracy. The thesis also obtain a very simple linear circuit model and make a detailed analysis of the LCC resonant converter by using the circuit model and derived the dc gain relationship with resonant frequency and resonant parameters.By considering the big parasitic parameters of the high-frequency high-voltage transformers, the thesis made use of leakage inductance and distributed capacitance of transformer as LCC resonant converter's resonant elements. The complexity and design difficulty of circuit was decreased by using the effluence of parasitic parameter. Then a chart method was proposed to design resonant parameters, and the validity of the method is proved by simulations and experiments.By considering the difference of amorphous alloy material and traditional magnetic material, the thesis chose the amorphous alloy material as the core of transformer. Then by analyzing the main difficulties of high-frequency high-voltage transformer's design. A method to control the transformer's parasitic parameters was given and the integrated design method considering the characteristics of amorphous alloy material was proposed. High-frequency high-voltage DC power supply was designed and a detailed description of how to choose the circuit elements is given The control strategy and protective circuit are briefly introduced at the same time. Then the power supply was tested by using a simulation load and the test waveform was analyzed seriously.