农用智能交流稳压器的研究与实现

发布时间：2018-05-28 16:15

本文选题：交流稳压 + 串联补偿　；参考：《河北科技师范学院》2014年硕士论文

【摘要】：针对电网电压波动造成电压不稳、边远地区长期电压不足、一些高精密仪器设备需要高稳定的电源等问题,以及目前交流稳压电源体积大,或电路控制复杂的缺点,设计了一种低功耗智能交流稳压电源。系统硬件和软件均采用模块化设计,系统硬件设计采用补偿型稳压方式,由补偿变压器、双向调节系统、数据采集与处理系统、保护电路、人机接口电路等构成。系统采用串级调压并给出了斩控电路输出滤波器参数的计算方法。根据稳压电源精度要求,给出了一种高精度电压、电流过零及极性检测电路。控制电路中所用电源均为开关电源。系统核心采用带8通道10位AD输入和PWM输出的STC12C5A32AD单片机,使系统结构和控制方式简单;电压闭环采用直流电压采样反馈技术,工频电压经过全波整流,变为正弦半波直流电压,分压电阻分压后,直接输入单片机AD口采样,求取电压有效值,采样频率达12.8 kHz,采样及控制精度高;4kHzPWM斩波频率,滤波电容和电感容量小,且谐波含量小。系统软件开发基于Keil uVISION4集成开发环境为开发平台,采用C51语言编写。整个程序有:主程序、显示子程序、按键重点子程序、数据采集与数据处理子程序、控制算法子程序、输出控制子程序、故障报警子程序等。主程序主要完成初始化、调用各模块程序。样机实验结果表明,该装置电压输出精度高,体积及重量较一般产品减小,具有较大的实用价值。
[Abstract]:In view of the voltage instability caused by the voltage fluctuation of the power network, the long-term voltage shortage in the remote areas, the need of high stable power supply for some high-precision instruments and the shortcomings of the large volume of the current AC voltage stabilized power supply or the complex circuit control, A low power intelligent AC power supply is designed. The hardware and software of the system are designed by modularization, and the hardware of the system is designed by compensating voltage stabilizer, which is composed of compensation transformer, bidirectional regulation system, data acquisition and processing system, protection circuit, man-machine interface circuit and so on. The system adopts cascade voltage regulation and gives the calculation method of the output filter parameters of the chopper circuit. According to the precision requirement of voltage stabilizer, a high precision voltage, current zero crossing and polarity detection circuit is presented. The power supply used in the control circuit is switching power supply. The core of the system is a STC12C5A32AD single-chip microcomputer with 8-channel 10-bit AD input and PWM output, which makes the system structure and control mode simple, the voltage closed-loop adopts DC voltage sampling feedback technology, the power frequency voltage is rectified by full wave, and the power frequency voltage becomes sinusoidal half-wave DC voltage. After the partial voltage resistance is divided, the chip microcomputer AD port is directly input to sample, the sampling frequency is up to 12.8 kHz, the sampling and control accuracy is high and the frequency of 4kHz PWM chopping, the capacity of filter capacitance and inductance is small, and the harmonic content is small. System software development based on Keil uVISION4 integrated development environment for the development platform, using C 51 language programming. The whole program includes: main program, display subroutine, key subroutine, data acquisition and data processing subroutine, control algorithm subroutine, output control subroutine, fault alarm subroutine and so on. The main program mainly completes initialization, calls each module program. The experimental results of the prototype show that the voltage output precision of the device is high, the volume and weight of the device are smaller than that of the common product, and it has great practical value.
【学位授予单位】：河北科技师范学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM44

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