Rare earth giant magnetostrictive transducer inverter power supply based on DSP chip TMS320F2812

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Rare earth giant magnetostrictive transducer inverter power supply based on DSP chip TMS320F2812 [Copy link]

Rare earth giant magnetostrictive transducer inverter power supply based on DSP chip TMS320F2812 Rare earth giant magnetostrictive transducer is a device that converts electromagnetic energy into mechanical vibration using giant magnetostrictive materials. Compared with the widely used piezoelectric ceramic transducer, it has the advantages of wide working range, high conversion efficiency and fast response speed. It is mainly used in underwater acoustics, ultrasound and active vibration control. Among them, the driving power supply of the giant magnetostrictive transducer is the key factor affecting the performance of the system. In view of the digital and intelligent development of power supply control technology, a digital inverter power supply based on DSP devices is designed in this paper to drive the giant magnetostrictive transducer to work normally and automatically track the resonant frequency. The giant magnetostrictive transducer used in this project is mainly used in small ultrasonic cleaning machines. The main technical indicators of the driving power supply are: input AC power is 220 V, output frequency is 15~25 kHz, and output power is about 50 W. This paper first discusses the overall design of the drive power system, and then specifically explains the hardware circuit design and software implementation. Finally, experimental tests are carried out and conclusions are given. 1 Overall system design The best driving waveform of the rare earth giant magnetostrictive transducer used is a high-frequency sine wave, so the designed drive power system structure is shown in Figure 1. The DC power supply module is composed of transformer, rectifier, filter and voltage regulator circuits, providing DC working voltage for high-frequency inverter circuit; the high-frequency inverter circuit adopts half-bridge inverter circuit to amplify the SPWM wave generated by DSP, so that it can generate AC square wave of specified power; the DSP signal circuit generates SPWM wave of corresponding frequency, which is electrically isolated from the power circuit by optical coupling circuit, and then the power switch tube of high-frequency inverter circuit works normally through driving circuit; the matching filter circuit is used to filter the SPWM waveform and convert it into sine wave, and complete impedance matching and tuning functions at the same time; the feedback circuit samples the working current of the transducer, and can easily realize over-current protection through software, and at the same time, frequency tracking is performed according to the current value, and the software adjusts the sine wave frequency to make the transducer work in the best state. 2 Hardware Circuit Design and Implementation The hardware system is mainly composed of the following parts. 基于DSP芯片TMS320F2812的稀土超磁致伸缩换能器逆变电源.pdf (206.98 KB, downloads: 9)

2018-10-21 21:40 上传

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Do you have a detailed schematic? Please give me one