Design Of Electric Film's Voltage Withstand Test System Based On DSP

In recent years, with the electric heating film industry in China continues to develop, electric film product safety and quality problems growing interest in all sectors of society. Among them, the electric insulation film surface is the key to affect product quality, in order to protect the safe operation of the electric heating film can put into use, it is necessary for the performance of electric insulation film of AC voltage withstand testing. Currently, electric film production companies using the commercial power supply pressure test, this test method is still using the traditional analog control, the method and the high demand for test equipment operation is more complex, it has been unable to meet the production needs. Therefore, the actual needs of enterprises, to develop a set of DSP-based electric film Test Systems.Based on the above practical background, the first of several domestic and international pressure detection techniques were analyzed and compared. Ultimately, the choice of formula FM series resonant way pressure device design.Through the series resonant circuit study, a mathematical model series resonant voltage test systems, and the system with special frequency was analyzed, using variable parameters mean PI digital control algorithm is the voltage on the sample adjust, and through MATLAB simulation shows the system closed-loop output response curve. Then we made a more detailed analysis of the sinusoidal pulse width modulation technology, proposed unipolar SPWM modulation method for modulating the inverter and generates SPWM wave by asymmetric regular sampling method. Based on the above theoretical analysis, we put forward a TMS320F2812 as the control core design system, namely the system of main circuit, control circuit and a control system software design.This topic is Heilongjiang benefits of geothermal Limited and our school to develop research-based electric heating film pressure detection system DSP, the system of low cost, simple and convenient operation. The device is put to use in the company, tests showed the film by an electric AC voltage test can effectively detect defects in the insulating film surface electric film, electric film to detect toward digital, intelligent development has laid a foundation compacted.