Papers by Keyword: DSP

Abstract: DSP (XC2267) is the main control chip which does the increment PI algorithms and realizes the voltage and current double closed-loop. Three-phase thyristor rectifier method based on the phase self-adjusting of FPGA is proposed. A method for swept-frequency start circuit is designed to implement the transition between the high-power and low-power. The invert system uses the compound control of improved PWM and frequency phase lock to improve the control accuracy and efficiency. Lastly, by using bench, the circuit is tested and the feasibility and effectiveness of the whole system are verified.

Abstract: The real-time processing for the input analog audio signal, audio processing program is proposed based on DSP. The system use FFT algorithm as the core, first, the input analog audio signal is sampled and A/D conversion using TLV320AIC23, and then use high speed digital signal processor to make real-time processing for the signal. Theoretical and experimental results show that the system can meet the design requirements, it has the advantage of high real-time and simple structure. The system has a good application and reference value for the development and design of data collecting and remote monitoring.

Abstract: A kind of MELP vocode is designed based on DSP TMS320VC5509A in this article. Firstly, it expatiates the MELP algorithm,then the idea of modeling and realization process on DSP based is proposed. At last we can complete the function simulation of the encoding and decoding system,and the experiment result shows that the synthetical signals fit well with the original ones, and the quality of the speech got from the vocoder is good.

Abstract: With the rapid development of Internet technology throughout the world, the technology of DSP has progressed tremendously. The paper conducts a research on the routing algorithm based on DSP routing module in medium-voltage power line communication. It attempts to improve link state routing algorithm based on OSPF protocol so as to enable all the circuits of the communicated DSP chips to send and receive data in real-time detection.

Abstract: Automatic quasi-synchronization device is an important device for power plants, which directly affect the safety and life of the generator as well as energy savings. Adverse devices and network with the same period a manual generator are killers and it has an affect the operation of the power system. There are still a large number of power plants and networks using manual mode, although most plants have automatic synchronizing device, but most are in the disabled state. Technology development path suited to phase out production which is old and bad and replace them with the more advanced new products. Therefore, the development of advanced computer automatic synchronizing device can greatly prevent the occurrence of the closing asynchronous generator. This paper introduces the development status automatic synchronizing device, discusses the hardware design of DSP-based automatic synchronizing device and automatic synchronization process simulation.

Abstract: A hardware system based on digital signal processor (DSP) is designed for power line carrier communication (PLC) over medium voltage power line networks. This system is designed to realize better stability and reliability of data communication in electric system. This paper introduces PLC technology, and then discusses the composition of this system and gives design scheme. Finally, the DSP implementation is developed with analog front-end (AFE) and coupling circuit. This paper shows a new PLC and automatic management solution.

Abstract: The application of new energy resources such as wind power gets more and more attention, with the environmental problems and energy issues have become increasingly prominent. But the volatility and the characteristics of intermittent has greatly restricted the efficient utilization of the new energy. This paper designed a control circuit, the super capacitor as the energy storage device and the 28335 as the core. This circuit controls the charging and discharging of the super capacitor through the system sampling by 28335, so as to realize to the instantaneous compensation effect on the power fluctuation of the grid connected wind turbine, smooth wind farms output power and voltage. Apply this method by super-capacitor and TMS320F28335, we can provide a useful reference and efficient application of new energy.

Abstract: The super capacitor can effectively prolong the operation of the energy storage system, improve its economic performance and power output capacity. But the design of the super capacitor is not perfect, the design method is also very troublesome.In this paper, through studying the different implementations of Matlab - DSP integrated design methods,I tried to find the optimal method to achieve the most simple and rapid Matlab - DSP integrated design. Build models in the Simulink, complete the design of the model, and convert it to DSP assembly language and download to the target board. The main process of this method is that the above steps. Apply this method in the design of the super capacitor , we can greatly speed up the development speed.

Abstract: Magnetron power supply is one of the most important components in coating devices in applied technology. Magnetron regulated power supply with high power and high efficiency is studied and designed on the basis of high-frequency switching power supply technology. The principle of the main circuit and control circuit design are introduced. A MATLAB simulating model is composed to study parameters and waveforms of the designed circuits. The hardware circuit and software program are designed based on simulation results. The adjustment and display of the output voltage and the output current of the power supply under different work modes are achieved with TMS320F2812 DSP system. Practical applications confirm that the designed power supply has good constant current control effect, high reliability and working stability.

Abstract: In this paper, we present an algorithm for voice speed changing and pitch shifting based on TD-PSOLA. MATLAB simulation results indicate this algorithm can effectively improve the precision of pitch detection and convert speech into desired one. After the algorithm being realized and optimized, a real-time system is implemented on DSP, which can produce desired fundamental frequency and duration.