Description: 本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。-the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D / A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current / voltage changes, the A / D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the Platform: |
Size: 197253 |
Author:DAI |
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Description: 本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。-the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the Platform: |
Size: 196608 |
Author: |
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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 Platform: |
Size: 2048 |
Author:zhendongzhao |
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Description: 本设计以AT89S52为核心，通过A/D、D/A转换、V/I转换及独特的算法实现了高精度的，电流输出范围为20mA～2000mA的数控直流电流源。该电流源具有电流可预置，1mA步进，同时显示给定值和实测值等功能。-The design AT89S52 as the core, through the A/D, D/A converter, V/I conversion and a unique high-precision algorithm, the current output range of 20mA ~ 2000mA NC dc current source. The current source has a current can be preset, 1mA stepping, also shows a given value and the measured values and other functions Platform: |
Size: 247808 |
Author:xiang |
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Description: 数控直流稳压电源+毕业设计本文将介绍一种数控直流稳压电源，本电源由模拟电源、显示电路、控制电路、数模转换电路、放大电路五部分组成。准确说就是模拟电源提供各个芯片电源、数码管、放大器所需电压；显示电路用于显示电源输出电压的大小。数控直流电流源能够很好地降低因元器件老化等原因造成的输出误差，最大输出电流2A，最高输出电压30V，电流、电压都具有步进为0.1-Numerical control dc manostat+ graduation designWith the development of the times, digital electronic technology has been popular in all of our lives, work, research, and all fields. This paper introduces a NC DC power supply, the power consists of analogue power supply, display circuit, control circuit, digital-to-analog converter and circuit amplifier. Accurately, analog power supplies voltage for chip power, the digital tube and amplifier display circuit displays the output voltage. NC DC current source can reduce output error that caused by components aging, with functions of the maximum output current is up to 2A, the maximum output voltage is 30 V, current and voltage are stepping to 0.1 Platform: |
Size: 31744 |
Author:王军 |
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Description: SDA7123是一个三路高速、数模转换器的单片集成电路。它包括三路高速、 10位输入的视频 DA转换器、标准的 TTL输入 和互补输出高阻抗的模拟输出电流源。-SDA7123 a three-way high-speed, monolithic DAC. It includes three-way high-speed, 10-bit input video DA converter, a standard TTL input and complementary outputs the analog output of high impedance current source. Platform: |
Size: 249856 |
Author:王宇 |
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Description: ：热电阻在工业生产中常用于中低温区测温，是温度测量中应用较为普遍的测温元件．通过对其测
温原理的研究，设计了基于MSP430FI69单片机的热电阻测温仪．本设计采用恒流源驱动三线制热电
阻，配合信号平移、放大电路，利用片内A／D转换器，通过分时采样将热电阻对应的电压信号采集进来．
经过一阶插值拟合运算程序处理后显示温度值并由D／A转换器输出电压信号，再经过V-1变换实现
4—20 mA变送输出功能．-: Thermal resistance often used in industrial production in the low temperature zone temperature, the temperature measurement of more general use of temperature measurement devices. Through its temperature measurement principles of research, design microcontroller based MSP430FI69 thermal resistance thermometer. The design uses a constant current source driver RTD three-wire system, with the signal translation, amplification circuit, the use of on-chip A/D converter, sampling the thermal resistance through the time-corresponding voltage signal acquisition came. After fitting a first-order interpolation processing operation program displays the temperature value by D/A converter output voltage signal, and then transform through the V-1 4-20 mA transmitter output. Platform: |
Size: 148480 |
Author:nnnn |
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Description: This paper presents the enhancement of voltage sags/swell harmonic distortion and low power factor using
Distribution Static Compensator (D-STATCOM). The model is based on the Voltage Source Converter (VSC) principle. The
D-STATCOM injects a current into the system to mitigate the voltage sags/swell. to improve harmonic distortion and low
power factor. The simulations were performed using MATLAB SIMULINK version R2009b.-This paper presents the enhancement of voltage sags/swell harmonic distortion and low power factor using
Distribution Static Compensator (D-STATCOM). The model is based on the Voltage Source Converter (VSC) principle. The
D-STATCOM injects a current into the system to mitigate the voltage sags/swell. to improve harmonic distortion and low
power factor. The simulations were performed using MATLAB SIMULINK version R2009b. Platform: |
Size: 302080 |
Author:alok |
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Description: 本文主要介绍了温度测量仪的设计，包括硬件设计和软件设计。文中首先介绍系统总体结构，接着对系统设计过程进行具体介绍（包括硬件部分和软件部分），最后对本次设计进行总结。在本次设计中选用了PT1000作为温度传感器，采用恒流源测温方法，通过单片机进行控制，用放大器、A/D转换器进行温度信号的采集。总的来说，该设计是可行的。-This paper mainly introduces the design of the temperature measurement instrument, including hardware design and software design. This paper first introduces the system structure, then the system design process for specific introduction (including the hardware and software of), the last of this design were summarized in this paper. In the design of the PT1000 as temperature sensor selection, the constant current source temperature measurement method, through the single-chip microcomputer control, with an amplifier, A/D converter to temperature signal collection. In general, the design is feasible. Platform: |
Size: 43008 |
Author:wanglong |
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Description: A hybrid fuzzy-PI controller for voltage source
converter based HVDC (VSC-HVDC) transmission system is
proposed in this paper. At first, the elementary model of VSCHVDC
is described. Then the fuzzy self-tuning control strategy is
proposed, in which direct current control strategy and dual
closed loop structure are designed in dq synchronous reference
frame. Independent control of the active and reactive power is
realized. Simulation results show that the designed control system
obtains satisfying performance, and the adjustments of power
flow could be achieved quicker than convention PI control. Platform: |
Size: 2249728 |
Author:Bidyut Hota |
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Description: 自动电阻测试仪程序：自动电阻测量仪设计采用C8051F020单片机作为核心,采用高精度恒流源驱动的伏安法针对不同档位电阻进行测量,选用MAX1241高精度A/D转换器进行模数转换,具有100Ω1、kΩ、10 kΩ1、0 MΩ四个量程,电阻测量精度均达到0.4 。各档位之间均可以实现手动分档或自动档位切换,并能根据键盘输入的电阻值和误差值进行筛选,对于不合格的电阻能够给出语音提示,该系统同时可以自动测量连续变化的电阻值并实时显示及绘制变化的曲线。自动电阻测量仪体积小、精度高、运行稳定可靠,具有一定的实用价值-Automatic Resistance Tester Program: Automatic resistance meter designed using C8051F020 microcontroller as the core, high-precision constant current source driven voltammetry measurement of resistance against different stalls, the choice MAX1241 precision A/D converter analog to digital conversion, has 100惟1, k惟, 10 k惟1, 0 M惟 four ranges, resistance measurement accuracy reaches 0.4 . Both can be achieved between each gear manually sub-file or automatic gear switching, and according to keyboard input resistor values and error values were screened for resistance to give unqualified voice prompts, the system can automatically measure changes continuously while The resistance value and real-time display and rendering the curve. Automatic resistance measuring instrument, small size, high accuracy, stable and reliable, has a certain practical value Platform: |
Size: 2048 |
Author:weihao |
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Description: A static synchronous compensator (STATCOM), also known as a "static synchronous condenser" ("STATCON"), is a regulating device used on alternating current electricity transmission networks. It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power to an electricity network. If connected to a source of power it can also provide active AC power. It is a member of the FACTS family of devices. Platform: |
Size: 1024 |
Author:sakthivel |
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Description: The
Z-source converter overcomes the conceptual and theoretical
barriers and limitations of the traditional voltage-source converter
(abbreviated as V-source converter) and current-source converter
(abbreviated as I-source converter) and provides a novel power
conversion concept. The Z-source concept can be applied to all
dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. Platform: |
Size: 680960 |
Author:xxx |
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Description: The conventional HVDC systems are based on the line-commutated current source converter (LCC) and are line commutated. Platform: |
Size: 173056 |
Author:indra17 |
Hits:
Search - current source converter