Share the electrical competition information: [A-Current signal detection device] Shaanxi Province/Shaanxi University of Science and Technology/First Prize/Li Jinghong/Dai Taoguang
[Copy link]
This post was last edited by Jacktang on 2021-8-5 10:46
A current signal detection device was designed and produced for this competition. The system mainly consists of a power amplifier circuit, a current sensor, detection and conditioning circuit, and a data acquisition, parameter measurement and display circuit with an ARM microcontroller as the core. The power amplifier circuit uses TDA2030 as the core to build a current amplifier circuit with a voltage gain of 1, driving a 10Ω load to generate a current of 10mA~1A. A coil made of enameled wire is used as a current sensor to sense the current signal. INA2134 and OP07 are used to form a signal conditioning circuit to convert the sensed weak signal into a voltage signal that is easy for the microcontroller to collect and process. The voltage signal is collected by the STM32 microcontroller to realize the peak-to-peak detection, frequency calculation, FFT analysis and display of the measured signal. When the input frequency range of the system is a non-sinusoidal signal of 50Hz~200Hz, the FFT algorithm can be used to measure the fundamental frequency of the current signal, as well as the amplitude of the fundamental and each harmonic component.
Competition experience: After choosing the topic, we did not do it directly, but roughly analyzed how many modules the topic consisted of and what modules it consisted of. After the analysis was clear, we did not rush to solder the circuit directly. Instead, we analyzed what modules and chips we used, and whether these modules and chips could meet the requirements after being made. These were all things we had to consider, because we did not have time to change the plan. After we analyzed the plan, we started to make the board. In the first three days and two nights, we basically did not rest, because we did not make it, we did not dare to rest, and we could not sleep. We kept adjusting the circuit, changing the board and adjusting the chip again and again. After three days and two nights of hard work, we finally completed the production. On the fourth day, it was not as difficult as the first three days. It was just a matter of writing a report and optimizing it.
作品报告.pdf
(921.62 KB, downloads: 64)
原理图.rar
(26.31 KB, downloads: 30)
| 
提升卡
变色卡
千斤顶
京公网安备 11010802033920号
