Research On Minitype Integrate Power Supply System Of Variable Frequency Based On DSP

In order to enhance the performance of aircraft while it is flying at increasing high speed, people pay more and more attention on the active flow control of adaptive wing boundary. The synthetic jet control is a new main flow control technology presented recent years. It becomes one of the highest potential methods for flow control, because its actuator has a simple structure and easily to be controlled and less power consume. In general, the synthetic jet is generated through the vibration of the membrane of the actuator driven by piezoelectric materials with sine wave signal simulating. In order to realize actuator power self-support and self-control, the heat energy of aircraft structure could be transmitted to electrical power. Then through the power conversion circuit, the needed sine-wave simulating signal for synthetic flow actuator could be generated. In this way the actuator could work under no constraint of aircraft carrying power system, and also draw off the heat for aircraft structure.The module of heat energy to electrical power conversion could offer low voltage DC supply, but the needed simulating signal is high voltage variable frequency sine wave power. So this paper focuses on the research of how to convert low voltage DC supply to VVVF power supply. Because of the special applied environment and driving objects—piezoelectric materials, the design should be minimized, integrated, and also reliable. Its output frequency range should be wide enough. The waveform should be stable through closed loop control.Firstly this article draws an analysis between two suitable PWM methods, and brings forward a synthetic PWM technology through their combination. With this method the output frequency range could be broadened on a large scale. The design of whole system is finished with control core of TMS320F2812, which is one of the most advanced DSP in control field. The whole system includes four parts: boost voltage module, inverter module, control module and filter module. And there are also some other necessary periphery circuits. In the article every part of circuits is designed detailed and the whole system is integrated at last. Finally, the synthetic PWM control signal is generated by DSP through programming with C language. Under the control of this signal the system outputs the needed sine waveform. The successful design of whole system promotes the progress of variable frequency power supply in application fields besides motor speed control.