True RMS Detection of Non-Sine Wave for Power Grid

2011 ◽  
Vol 467-469 ◽  
pp. 1798-1802
Author(s):  
Xin Sheng Che ◽  
Xiao Xue Gu ◽  
Li Wang
Keyword(s):  
Digital Signal ◽  
Sine Wave ◽  
Sampling Frequency ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Testing Data ◽  
Ad Converter ◽  
Scale Error ◽  
Power Frequency ◽  
Harmonic Components

Simple multimeter can not measure True RMS of power frequency if there mixed harmonic components. In order to solve this problem, a method is adopted to design a measurement system by using STC Single Chip Microcomputer (SCM). It changes current into voltage by using I/V conversion circuit. Then analog signal turns into digital signal through AD converter. Finally, the Single Chip Microcomputer treats and calculates the data by the RMS algorithm. Sampling frequency of the system is set as 6400sps by Single Chip Microcomputer. This kind of designment uses software instead of hardware and reduces the costs. The realization of the system shows the validation and transportability of the algorithm. The testing data show that this system can measure True RMS of power frequency. The relative full scale error is smaller than 1.284%.

scholarly journals Design of Smoke Alarm Disperser Based on Single-chip Microcomputer

2021 ◽  
Vol 2113 (1) ◽  
pp. 012057
Author(s):  
Yang Wang ◽  
Lichun Han ◽  
Yonghui Zhao ◽  
Yuquan Xue ◽  
Liming Wang
Keyword(s):  
Safety Management ◽  
Rapid Development ◽  
Digital Signal ◽  
Single Chip ◽  
Smoke Alarm ◽  
Single Chip Microcomputer ◽  
Linear Change ◽  
Working Environments ◽  
Fan Speed ◽  
Smoke Sensor

Abstract With the rapid development of society and economy, various laboratories have become more complete in number and equipment, but subsequent laboratory accidents frequently occur. Therefore, it is imperative to construct a laboratory safety management system to ensure the safety of laboratory personnel and complete equipment. This article intends to design a smoke alarm, which mainly includes measuring the sensitivity of the smoke sensor to the concentration of smoke in the air, and the linear change of the sensor converting the corresponding analog signal into a digital signal. By designing the fan speed to be controlled by the change of smoke density, the speed of the motor is adjusted. And the alarm module can sound an alarm when the smoke concentration is certain, and at the same time, it can automatically cancel the alarm when the smoke concentration decreases. Finally, a simulation experiment is designed to simulate the effect of the sound alarm of the smoke alarm disperser on the dispersal of smoke under different working environments.

Design and Implementation of DDFS Based on CORDIC in FPGA

2014 ◽  
Vol 539 ◽  
pp. 65-69
Author(s):  
Xiao Ming Yang
Keyword(s):  
Main Part ◽  
Digital Signal ◽  
Sine Wave ◽  
High Accuracy ◽  
Cordic Algorithm ◽  
Pipeline Architecture ◽  
Design And Implementation ◽  
Wave Oscillator ◽  
Ad Converter ◽  
Hardware Resource

DDFS is widely used in digital signal processing and communications. Orthogonal sine wave oscillator is the main part of DDFS. In this paper, a new CORDIC algorithm implemented based on FPGA is proposed to realize DDFS. Replace the traditional look-up table ROM method to CORDIC algorithm. The algorithm has been realized in the FPGA using the pipeline architecture. The design has the advantages of little hardware resource consumption, high accuracy, and without memory. At the end, give a simulation waveform and spectrum analysis by AD converter, show the result in oscilloscope.

scholarly journals Drink-driving monitoring system based on single chip microcomputer and sensor

2021 ◽  
Vol 1750 ◽  
pp. 012037
Author(s):  
Yong Chen ◽  
Shudong Wang ◽  
Hao Wang ◽  
Shen Liu ◽  
Runqing Li
Keyword(s):  
Monitoring System ◽  
Single Chip ◽  
Single Chip Microcomputer

The Design of the NC Teaching Plotter Based on Single Chip Microcomputer

2014 ◽  
Vol 909 ◽  
pp. 342-345
Author(s):  
Xin Juan Shang
Keyword(s):  
Motor Control ◽  
Teaching Practice ◽  
Nc Machining ◽  
Numerical Control ◽  
Stepper Motor ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Nc Program ◽  
Practice Teaching ◽  
Stepper Motor Control

The NC Teaching Plotter is designed for the practice teaching needs of NC machining, In order to improve current existing practice teaching environment of "many student, less equipment". It explains the NC concept with concise way and demonstrates NC thought by the intuitive operation.In this paper, the design of NC teaching plotter makes interpolation motion between pen and table based on NC program in accordance with the requirement made by user, to draw the graphics by moving the magnet control brush painting through the single chip digital control and the two stepper motor control X, Y two axes feed. The NC teaching plotter which demonstrates more clearly and directly the numerical control idea has high practical value for teaching practice.

The Design and Implementation of a Handling-Robot

2014 ◽  
Vol 644-650 ◽  
pp. 290-293
Author(s):  
Zhi Hui Deng ◽  
Yun Hang Zhu
Keyword(s):  
Production Efficiency ◽  
Structure Design ◽  
Stepper Motor ◽  
Current Sensor ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Accident Rate ◽  
Repetitive Work ◽  
Design And Implementation ◽  
Information Interaction

A robot based on STC12C5A60S2 single-chip-microcomputer is designed for improving the production efficiency and reducing repetitive work. The system could identify path by detecting metal using eddy current sensor. By ways of the single-chip-microcomputer controlling stepper motor, the robot can run according to the predetermined route, judge independently cargo range and deliver the goods to the designated location. The implementation methods of the important links, such as mechanical structure design, path recognition and steering engine driving and so on are introduced, the system of which make the information interaction with computer through ISP-module (In-system-programming).by testing the model, it shows that the system can meet the design goals of handling goods automatically, and it has higher application value of reducing the accident rate of worker in repeated works and improving labor productivity.

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