The Research Of Smart Programmable Ac Source

Programmable AC source has a widely application in the products' testing. For example, it can supply the adjuestable range of frequency and voltage. It also can measure the output voltage, output current ,output real power and so on. According to kinds of testing and regulation, the more powerful programmable ac source can output kinds of synthetic waveform, output by parallel or series structure, measure current harmonic components and so on.Firstly, it analyse the theoretical basis and a number of commonly used topology of programmable ac source. The topolopy of the source use the ac to dc, dc to ac, last output through transformer. It analyse the advantage and disadvantage between analog control systems with numerical control systems.The control plan uses the numerical control systems in the thesis.It has detailedly analysed and reaserched the control strategy of programmable ac source. The SPWM program is based on the equal-area equivalent. According to the feature of MCU, it has improved the arithmetic.The communication protocol between control board with up-machine is Modbus protocol.It has designed the filter board, control circuit, signal conditioning circuit and display board and so on. It theoretically analyse the parameters of filter board and transformer, the power consumption and temperature rise of control board and so on. Last through experimenting, it analyse the output waveform and has gotten some conclusion.