Design And Research Of High Frequency Digital Inverter Based On DSP

At present, with the rapid development of Power Electronics, convertor device istoward the development of small, efficient, and high-frequency direction. In this context, thetraditional hard-switching inverter has a lot problem such as switch stress and loss, lowswitching frequency and harmonic interference and so on. Limited to the cooling systemdesign hard switching mode switching frequency is difficult to obtain significantly improved.Soft switch technology with a significant reduction in switching losses, the switchingfrequency is significantly increased and significantly reduced the advantages ofelectromagnetic interference, can solve the above problem, the soft-switch technology hasgradually become an important research direction of the current transformer technology.This paper studies the soft-switching PWM inverter topology, the auxiliary resonantcommutation pole (Auxiliary Resonant Commutated Pole, ARCP) soft-switching technologyof zero voltage soft-switching technology transfer soft-switching technology (ZVT,Zero-Voltage-Transition). The advantages of this soft-switching topology: the auxiliary bridgearm control strategies and the main control of the inverter bridge are independent of each otherwithout disturbing each other, basically be able to eliminate the loss of the opening of the maininverter bridge switch, inverter system reduce the requirements of the cooling system and thefilter system, and the condition of output of the inverter can be improved. Premise introducesoft switch technology Research, a detailed analysis the work process of the auxiliary resonantcommutated pole (the ARCP) soft switch technology inverter circuit topology of a phase, and aphase work process matlab/simulink simulation.Then soft switching inverter control system is designed, and to determine the the auxiliaryresonant switching control strategy. To calculate the relevant parameters of the main circuit andthe resonant circuit, and selected components, the design of each of the switching control of thedrive circuit, and a detection circuit for each of the relevant parameters, in the DSP, the relevantprogram module has been tested, the soft-switching process of the system basically be realized.Different dead time, pre-charging time, the duty cycle of the auxiliary switch points underpressure capacitance and load current, soft switching inverter varying parameter simulation,and analysis of the impact of each parameter. Finally, the structure of PMSM AC servo system and action of inverter in servo drive system is expounded. And then the principle of a speedcontrol system is expatiated on. The speed control system is simulated in matlab/simulink.