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Description: 在大功率DC/DC开关电源中,为了获得更大的功率，特别是为了得到大电流时，经常采用N个单元并联的方法。多个单元并联具有高可靠性，并能实现电路模块标准化等优点。然而在并联中遇到的主要问题就是电流不均，特别在加重负载时，会引起较为严重的后果。普通的均流方法是采取独立的PWM控制器的各个模块，通过电流采样反馈到PWM控制器的引脚FB或者引脚COMP，即反馈运放的输入或者输出脚来调节输出电压，从而达到均流的目的。显然，电流采样是一个关键问题：用电阻采样，损耗比较大，电流放大后畸变比较大；用电流传感器成本高；用电流互感器采样不是很方便，同时会使电流失真。本文提出了一种新型的、方便的、无损的电流采样方法，并在这种电流检测方法的基础上实现了并联系统的均流。 -in High Power DC / DC switching power supply, in order to gain more power, in particular in order to obtain the current, frequently using N units parallel method. Parallel number of modules with high reliability, and the circuit module can achieve the advantages of standardization. However, in parallel encountered in the current main problem is uneven, particularly in the heavier load, it will cause more serious consequences. The general flow is to have an independent PWM controller modules, Current sampling through feedback to the PWM controller pin FB pin or COMP. that feedback operational amplifier input or output pin to adjust the output voltage, thereby achieving both flow purposes. Clearly, the current sampling is a key question : sampling resistor, loss comparison, the amplifier dis
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Size: 13056 |
Author: duanshaochun |
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Description: 在大功率DC/DC开关电源中,为了获得更大的功率，特别是为了得到大电流时，经常采用N个单元并联的方法。多个单元并联具有高可靠性，并能实现电路模块标准化等优点。然而在并联中遇到的主要问题就是电流不均，特别在加重负载时，会引起较为严重的后果。普通的均流方法是采取独立的PWM控制器的各个模块，通过电流采样反馈到PWM控制器的引脚FB或者引脚COMP，即反馈运放的输入或者输出脚来调节输出电压，从而达到均流的目的。显然，电流采样是一个关键问题：用电阻采样，损耗比较大，电流放大后畸变比较大；用电流传感器成本高；用电流互感器采样不是很方便，同时会使电流失真。本文提出了一种新型的、方便的、无损的电流采样方法，并在这种电流检测方法的基础上实现了并联系统的均流。 -in High Power DC/DC switching power supply, in order to gain more power, in particular in order to obtain the current, frequently using N units parallel method. Parallel number of modules with high reliability, and the circuit module can achieve the advantages of standardization. However, in parallel encountered in the current main problem is uneven, particularly in the heavier load, it will cause more serious consequences. The general flow is to have an independent PWM controller modules, Current sampling through feedback to the PWM controller pin FB pin or COMP. that feedback operational amplifier input or output pin to adjust the output voltage, thereby achieving both flow purposes. Clearly, the current sampling is a key question : sampling resistor, loss comparison, the amplifier dis
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Size: 12288 |
Author: duanshaochun |
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Description: NXP的一个开发例子。利用ARM公司开发的CARM开发环境可以打开-NXP example of a development. ARM developed using the amplifier can open development environment
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Size: 16384 |
Author: 杨兴随 |
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Description: 大功率音频放大器的设计，基于低通滤波器，H桥PWM技术-High-power audio amplifier design, based on the low-pass filter, H bridge PWM technology
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Size: 3111936 |
Author: Yang hong |
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Description: 丁类音频功率放大器的工作方式。同时利用PWM信号控制导通时间以放大信号。这个主要是性能研究开发 没有硬件-Class D audio power amplifier work. At the same time, the use of PWM signal to control turn-on time to signal amplification. The performance of the main research and development are not the hardware
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Size: 1609728 |
Author: 蚊子 |
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Description: 摘要】 本文介绍了以AT89S51单片机为核心的温度控制器的设计,在该设计中采用高精度的温度传感器AD590对电热锅炉的温度进行实时精确测量,用超低温漂移高精度运算放大器OP07将温度-电压信号进行放大,再送入12位的AD574A进行A\D转换,从而实现自动检测,实时显示及越限报警。控制部分采用PID算法,实时更新PWM控制输出参数,控制可控硅的通断时间,最终实现对炉温的高精度控制。
【关键词】 水温控制系统
PID控制单片机
温度控制是工业生产过程中经常遇到的过程控制,有些工艺过程对其温度的控制效果直接影响着产品的质量,因而设计一种较为理想的温度控制系统是非常有价值的。
一
系统设计方案的论证与比较
根据题目要求,电热锅炉温度控制系统由核心处理模块、温度采集模块、键盘显示模块、及控制执行模块等组成。-Abstract This paper introduces the single-chip AT89S51 temperature controller at the core of the design, in the design of high-precision temperature sensor AD590 temperature of the heating boiler accurate measurement of real-time, using ultra-low temperature drift, high-precision operational amplifier OP07 temperature Part of the use of PID control algorithms, real-time PWM control output parameter update and control the on-off Thyristor time, finally achieve the high-precision control of temperature.
【Key Words】 temperature control system
PID control of single-chip
Temperature control is the process of industrial production often encountered in process control, and some of its process control temperature of a direct impact on the quality of the product and thus more desirable to design a temperature control system is very valuable.
1
System design of the demonstration and comparison programs
According to the subject requirements, electric boiler temperature control syste
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Size: 225280 |
Author: 杨隆 |
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Description: 介绍了一种闭环智能数控直流电流源的设计原理和实施方案，该方案采用自行设计制作的高精度电压源，利用单片机、PWM和运算放大器构成A/DD/A转换器来控制场效应管导通状态的原理，达到了输出恒流的目的。整个系统采用89C58单片机作为主控部件，将预置电流值数据送入D/A转换器，经硬件电路变换为恒定的直流输出，同时使用采样电阻将实际输出电流转换成电压送入A/D转换器，并将其反馈到单片机中构成闭环系统，进而实现预设值和实际值的比较，再通过调整D /A转换器输出的电压来改变场效应管的导通状态，减小了实际值与预设值之间的误差，实现了电流可预置、可步进调整、输出的电流信号可直接数字显示的功能。采用硬件闭环、软件闭环、软件实时积分、实时滤波的方法，锁定输出电流，从而实现了高精度恒流源的目的。此次所设计的电流源具有精度高、结构简单、工作稳定、操作方便、成本低廉、带负载能力强等优点-The scheme adapts high precision voltage source designed by ourselves Micro Control Unit (MCU) D/A converter and amplifier to control the transmitting state of field effect transistor which attains constant current. The system adapts MCU 89c52 as main control part the output current is transformed into the voltage by sample resistant and the voltage is sent to D/A converter and then sent to the MCU compared with the setting current. If there exist errors we should adapt D/A converter output and change the transmitting state of field effect transistor. The actual value is directed to the setting value. The direct current reaches the constant value. The closed loop control and PID arithmetic is used to realize high precision and wide range in the software design part. The intelligent current source realizes that the output current can be preset adjusted step by step and displayed in digit directly. Above functions are operated by keyboard within the current source. The stability of this
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Size: 2048 |
Author: zhendongzhao |
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Description: 8051实现直流电机PMW调速系统
本文所述的直流电机闭环调速系统是以低价位的单片微机8051为核心的，而通过单片机来实现电机调整又有多种途径，相对于其他用硬件或者硬件与软件相结合的方法实现对电机进行调整，采用PWM软件方法来实现的调速过程具有更大的灵活性和更低的成本，它能够充分发挥单片机的效能，对于简易速度控制系统的实现提供了一种有效的途径。而在软件方面，采用PLD算法来确定闭环控制的补偿量也是由数字电路组成的直流电机闭环调速系统所不能及的。曾经也试过用单片机直接产生PWM波形，但其最终效果并不理想，在使用了少量的硬件后，单片机的压力大大减小，程序中有充足的时间进行闭环控制的测控和计算，使得软件的运行更为合理可靠。-This article mainly introduces the method to generate the PWM signal by using MCS-51 single-chip computer to control the speed of a D.C. motor. It also clarifies the principles of PWM and the way to adjust the duty cycle of PWM signal. In addition, IR2110 has been used as an actuating device of the power amplifier circuit which controls the speed of rotation of D.C. motor. What’s more, tachogenerator is used in this system to measure the speed of D.C. motor. The result of the measurement is sent to A/D converter after passing the filtering circuit, and finally the feedback single is stored in the single-chip computer and participates in a PI calculation. As for the software, this article introduces in detail the idea of the programming and how to make it.
Key words: PWM signal tachogenerator PI calculation
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Size: 1024 |
Author: 陈与 |
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Description: 首先要说：是我自己写的你他地方下不到！
这是一个用PWM播放.wav歌曲文件的程序，歌曲本身已经被和代码一起固化到FLASH中了，想要听到美妙的歌曲你只需要把PB0经过一个滤波放大电路接到蜂鸣器或耳机插孔上，并把程序下到你的STM32中运行就可以了。
另外，看看这篇关于PWM播放.wav的文章：http://wmx0901.blog.163.com/blog/static/10320222020097171727367/edit/-First of all, to say: I wrote it myself, he places less than you! This is a PWM player with. Wav files songs, songs and the code itself has been with the curing of the FLASH, and you want to hear the wonderful songs you have to do to go through a filtering PB0 received buzzer amplifier or headphones jack, and the procedures to run your STM32 it. In addition, take a look at this on the PWM player. Wav article: http://wmx0901.blog.163.com/blog/static/10320222020097171727367/edit/
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Size: 1145856 |
Author: wmx0901 |
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Description: PWM调制，将一正弦信号转化为PWM序列输出，用于驱动D类功放-PWM modulation, a sinusoidal signal into a sequence of PWM output, Class D amplifier to drive
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Size: 1024 |
Author: wuzhiqiang |
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Description: 本文件夹包含浙江大学信电系暑期电子设计培训时以及校赛时的几个项目的代码，包括波形发生器，集成运算放大器，简易数字显示声音信号采集测量仪的设计，数码管红外遥控显示，温度测量PWM模拟控制LED等。采用的单片机为凌阳SP061A单片机。-This folder contains a letter, Zhejiang University, Department of Electrical Electronic Design training in the summer and school event, when the time code for several projects, including waveform generator, integrated operational amplifier, simple digital display audio signal acquisition measuring instrument design, digital control infrared remote control display, temperature measurement PWM analog control LED and so on. Sunplus SP061A used for the microcontroller MCU.
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Size: 723968 |
Author: 金心宇 |
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Description: Class D amplifier uses MOSFETs that are either
ON or OFF.
PWM technique is used to express analog audio
signals with ON or OFF states in output devices.
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Size: 1294336 |
Author: isaac |
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Description: Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100 duty cycle. The UC3844 and UC3845 can operate
with 50 duty cycle.-Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100 duty cycle. The UC3844 and UC3845 can operate
with 50 duty cycle.
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Size: 184320 |
Author: shen |
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Description: 基于51单片机的恒温箱控制系统，用两级三极管放大做驱动，PWM控制。初始设定的可调温度在室温到85度之间。-51 microcontroller-based incubator control system, do drive two transistor amplifier, PWM control. The initial set of adjustable at room temperature to 85 degrees.
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Size: 258048 |
Author: sunny09 |
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Description: AVR 单片机制作的D类功放，用AVR 自带的AD采样音频输入，产生调制的PWM波，驱动功率H桥，然后滤波成放大的具有驱动能力的音频信号，驱动喇叭播放音乐。完全用程序实现，里面存有正弦波的数据，也可以输出正弦波。-AVR microcontroller produced by the Class D amplifier, the AVR AD sampling the audio input, to generate the modulation of PWM wave-driven power H-bridge, and then filtering into the amplified audio signal of the ability to drive, drive speakers play music. Entirely in the program, which there are data of the sine wave, sine wave output.
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Size: 17408 |
Author: 杨剑 |
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Description: 单片机产生一个PWM波，经过一个功率放大电路作用于一个外接喇叭-Microcontroller generates a PWM wave through a power amplifier circuit for an external speaker
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Size: 1024 |
Author: bili |
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Description: STC单片机做的一个D类功放的程序，通过采集音频信号转换PWM实现。-STC microcontroller to do a class D amplifier program
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Size: 17408 |
Author: 邹宇汉 |
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Description: D类功率放大器、PWM脉宽调制、H桥电路，Butterworth低通滤波器
Abstract:-Class D power amplifier, PWM pulse width modulation, H-bridge circuit, Butterworth low-pass filter Abstract:
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Size: 387072 |
Author: 张远进 |
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Description: Power amplifier simulation using pulse width modulation PWM system. The duty cycle variations are used to reconstruct the signal and compare against the reference.
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Size: 72704 |
Author: Omer |
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Description: mega8_TEA5767_20120916 , added volume control for TDA7052A amplifier via PWM output and storing settings (frequency, volume) to EEPROM
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Size: 26624 |
Author: dimo |
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