共查询到19条相似文献,搜索用时 188 毫秒
1.
基于PWM滤波还原电压的理论分析,设计了一种利用FPGA产生PWM波,再经电平转换、滤波、放大等电路完成D/A转换,最终输出电压范围为±10V的电路。实验表明,该方法适用于集成有FPGA的控制系统开发,具有简单易行、输出精度高稳定性好、节省硬件成本与空间等特点。 相似文献
2.
3.
介绍隔离型高精度D/A转换器的设计方法由单片机89C52产生PWM,经过光电隔离和一个双RC电路,将数字信号转换为直流电压信号,再经过电压/电流转换电路(V/I),输出0~20 mA电流信号;通过软件校正,达到较高的精度. 相似文献
4.
介绍隔离型高精度D/A转换器的设计方法:由单片机89C52产生PWM,经过光电隔离和一个双RC电路,将数字信号转换为直流电压信号,再经过电压/电流转换电路(V/I),输出0~20 mA电流信号;通过软件校正,达到较高的精度。 相似文献
5.
6.
为小型实时聚合酶链式反应(PCR)仪研制一种基于数字信号处理器(DSP)芯片TMS320F2812的温度控制系统。由DSP产生的脉冲宽度调制(PWM)波经功率放大电路驱动半导体加热制冷片以Pt100作为温度传感器构建一种消除非线性误差的电桥传感电路,将温度信号转换为电压信号,电压信号送入DSP的A/D转换模块,同时进行位置式PID算法,然后调节PWM波的占空比,使整个系统对温度信号达到闭环控制。实验结果表明:系统的升降温速率能达到4℃/s,精度为0.2℃。 相似文献
7.
齐美彬 《单片机与嵌入式系统应用》2002,(8)
介绍一种基于DSP的黑白电视信号采集电路。电路由通用视频A/D转换器构成,DSP启动A/D转换并读取A/D转换结果。电路结构简洁、成本低、容易实现,能满足黑白电视信号采集的需要。 相似文献
8.
齐美彬 《单片机与嵌入式系统应用》2002,(7):300-302
介绍一种基于DSP的黑白电视信号采集电路.电路由通用视频A/D转换器构成,DSP启动A/D转换并读取A/D转换结果.电路结构简洁、成本低、容易实现,能满足黑白电视信号采集的需要. 相似文献
9.
基于FPGA与单片机的波形发生器设计 总被引:2,自引:0,他引:2
利用FPGA与单片机相结合的方法,使用单片机控制FPGA产生频率为10Hz~20kHz的正弦波,锯齿波,三角波和四路分别占空比0到100%可调的PWM波形.该波形发生器以单片机(MCS8031)为中心控制单元,由上位机界面,波形发生模块和D/A转换模块组成.采用DDS(直接数字频率合成)技术,通过VHDL语言,单片机C语言,VC 语言实现了对正弦波,锯齿波,三角波频率以及四路PWM波占空比的设置和发生. 相似文献
10.
11.
设计了一种新型的传感器信号读取电路,该电路将传统的脉宽调制PWM(PulseWidthModulation)电路进行改进,对PWM信号采用占空比和频率同时调制而不是单一的占空比调制,在信号传输过程中,该电路可将两路电压输入信号调制到一路PWM信号上,通过对输出PWM信号进行解调可还原两路输入信号的电压值.实验结果表明,该电路输出PWM信号占空比和频率分别与两路输入电压信号呈良好的线性关系,电压转换精度分别达到0.34%、0.26%.此外,该电路具有抗干扰能力强、转换精度高和成本低的优点,非常适合传感器信号的调理和读取. 相似文献
12.
13.
An improved pulse width modulation (PWM) neural network VLSI circuit for fault diagnosis is presented, which differs from the software-based fault diagnosis approach and exploits the merits of neural network VLSI circuit. A simple synapse multiplier is introduced, which has high precision, large linear range and less switching noise effects. A voltage-mode sigmoid circuit with adjustable gain is introduced for realization of different neuron activation functions. A voltage-pulse conversion circuit required for PWM is also introduced, which has high conversion precision and linearity. These 3 circuits are used to design a PWM VLSI neural network circuit to solve noise fault diagnosis for a main bearing. It can classify the fault samples directly. After signal processing, feature extraction and neural network computation for the analog noise signals including fault information, each output capacitor voltage value of VLSI circuit can be obtained, which represents Euclid distance between the corresponding fault signal template and the diagnosing signal, The real-time online recognition of noise fault signal can also be realized. 相似文献
14.
15.
PWM signal processing architecture for intelligent systems 总被引:1,自引:0,他引:1
A pulse width modulation (PWM) signal processing circuit based on the concept of A-D merged architecture for implementing intelligence in silicon chips, and to discuss advantages of the circuit through some experimental results. It consists of the PWM core circuit for linear arithmetic units, PWM multiply-and-accumulate circuit, and PWM nonlinear circuit. The number of devices and power dissipation can be reduced drastically comparing with existing binary digital electronics. The proposed circuit is applicable to intelligent processing engines which effectively perform multi-media and neural processings. 相似文献
16.
17.
The method of extended linearization is used for designing stabilizing nonlinear proportional-integral (PI) feedback controllers which regulate to a constant set-point value either the average output inductor current, the average input inductor current, or the average transfer capacitor voltage of a pulse width modulation (PWM) controlled Cuk converter. The design is carried out on the basis of the frequency-domain Ziegler-Nichols method, applied to a family of transfer function models of the linearized average PWM controlled circuit, parametrized by constant operating equilibrium points 相似文献
18.
高频脉冲电源对提高微细电解加工的工艺性有着重要的作用,而脉宽调制器经驱动电路生成IGBT控制信号决定着高频高压脉冲电源的输出频率及占空比;针对电解加工工艺的特殊性,创新性地提出基于32位微型控制器芯片STM32F103RCT6为核心的调频调占空比的方案;根据脉冲频率、占空比可调的要求,完成了脉宽调制器的软硬件设计,通过编译运行程序代码进行一系列的调频、调占空比实验并利用示波器采集两路输出的PWM波形;实验表明,自行研制的脉宽调制器能稳定地调节两路PWM控制信号的频率及占空比,验证了装置及设计的合理性。 相似文献