Development Of DSC-based Energy Feedback Type Electronic Load

In the electric equipment production areas are used to test the performance of the load device. Whether the traditional pure resistive load or the traditional electronic load, they are generated in the working process of excess energy in the form of heat consumption, resulting in a waste of energy. This design is for the power performance test and aging phenomenon of waste to energy, for the purpose of energy saving, research and design a feedback type single-phase DC electronic load. It overcomes the traditional resistor discharging device and a thyristor active inverter discharging unit of.From the electronic load analysis on status quo of hands, this article put forward the research significance and contents; the electronic load principle and function, put forward to realize electronic load several common ways, through comparing the advantages and disadvantages of several schemes to choose the specific implementation plan and the overall structure.In this paper, design of energy feedback type electronic load includes two important aspects:DC-DC boost part (DC-DC booster) and DC-AC invert part (DC-AC inverter). DC-DC boosted links the input voltage is converted into DC-AC inverter required high pressure, and the inverter is the front end of the boost link output to an in-phase AC voltage, and connecting to the grid energy feedback. The DC-DC booster, a DC-AC inverter, the analysis of several common circuit and its characteristics, and by comparing the advantages and disadvantages and the design requirements, the isolated type DC-DC booster circuit and single-phase voltage full bridge DC-AC inverter circuit as the design of the circuit structure. Analysis of the corresponding to the booster, the inverter control strategy and method, use SG3525set molding PWM controller as control core DC-DC booster, identified by a DC-AC inverter circuit control strategy for voltage and current type unipolar sine pulse width modulation (SPWM) of the double closed loop control method.In this paper, the design of main circuit of the important devices to do the analysis, put forward to use TI company DSC chip TMS32F28035as the controller of the main control chip. Introduced in MOSFET booster switch power tube and an inverter in IGBT switch power tube selection principle, gives the specific model. At the same time also gives the IGBT driving circuit and controller of signal sampling circuit and protection circuit. The hardware circuit is crucial, the control algorithm is the key, the traditional PID algorithm in nonlinear, time-varying and structure parameters of uncertain complicated control process, control effect is not very ideal, this paper introduces a model free adaptive control (MFAC) algorithm, through the comparison of simulation results, the model free adaptive control algorithm advantage.This paper gives the principle diagram of experimental prototype, PCB diagram and some testing waveform. The inverter section, in the Simulink simulation environment, simulation waveform indicates that, the system can output sine AC voltage and grid voltage tracking network, achieves the energy feedback, for further study of feedback type DC electronic load foundation.