Preliminary Research And Application Of The Gyrator-Capacitor Simulation Model Of Magnetics

Magnetics are the one of the most important part of the power electronic system .It has very great influence to the volume, weight, ripple current of the converters, and the dynamic performance of the output, the efficiency, the current stress and the voltage stress of the converter will be also influenced by the magnetics. So modeling and simulation of the magnetics play a great part of magnetics-design- optimizing, thorough analysis of the system including the static and dynamic performance.At the begining, the thesis introduced the development of the magnetic technology and its mathematic model briefly. After the review of the magnetic models, the gyrator-capacitor model is chosen as the basics of the magnetic simulation model to satisfy the need of electronic engineers and system research. The research aims at accurate simulation of the core's nonlinear magnetic characteristic.The research begins with simulating the basic magnetic curve. The thesis analyzes the influence of the parameter of the model to the basic magnetic curve. Based on the comparison between the simulated B-H curve and the provided B-H curve, the range of the parameter n corresponding to the different magnetic material is given. The way to calculate the relating parameters based on the magnetic curve is also given. The thesis analyzes the problem using the linear resistor to simulate the hysteresis characteristic. The core simulation model with nonlinear resistor and the parameters calculation method are presented. The simulation B-H curve comparing with that in datasheet proves the validity of the modeling method. The parameter of the model has close connection with the parameter of the core. So the model has large practicability.The proposed simulation model is used in the 3.5kW PFC converters and a multi-output converter with the magnetic amplifier regulator. The circuits'parameter design, inductors'modeling and system simulation are finished. One inductor's core is the powder core with the nonlinear permeability and the other's is amorphous alloys with the square B-H curve. The experimental results are consistent with the simulation results, verifying the effectiveness of the proposed core model. It provides effective support and help to the power electronics system design and optimization.