文档介绍：摘要:
随着电子技术的高速发展,电子系统的应用领域越来越广泛,电子设备的种类也越来越多,电子设备与人们的工作、生活的关系益密切。任何电子设备都离不开可靠的电源,它们对电源的要求也越来越高。特别是随着小型电子设备的应用越来越广泛,也要求能够提供稳定的电源,以满足小型电子设备的用电需要。
在电子设备中经常用到稳定性好、精度高、输出可预置的直流电流源。本文设计的数控直流电流源分为可分为电流源主电路、控制部分、人机界面(包括键盘输入与显示)和辅助电源四部分。输出电压本系统具有一下特点:系统为双环控制系统,动态响应快,超调量和稳态误差小;成本较低;技术成熟;软硬件结合,可靠性高,功能全,扩展余地大。
本设计的主要指标是:输入交流200~240V,50Hz;输出直流电压≤10V,输出电流范围:200mA~1000mA;具有“+”、“-”步进调整功能。
关键词:数控直流电流源;A/D转换;D/A转换;斩波电路
Abstract:
The active sound box is mainly formed by the preamplifier and power amplifier. Zoom is the nature of the power amplifier, preamplifier with enlarged role of the active speaker but it belongs to the small signal amplification. But its low power, however active speakers need to output more power to drive the load you need power amplifier. Is mainly responsible for the input of the preamplifier circuit of weak primary audio signal amplification and volume control, as input audio power amplifier preamplifier audio processing devices before, after and then zoom to zoom into the integrated power amplifier of signal, output signal voltage and current at the same time meet the speaker needs is voice control integrated power amplifier power (loudness). Active speaker external consists mainly of the power, the power supply provides power for the entire circuit. Through the front of integrated amplifier, power amplifier and power supply design constitutes active speaker design and construction.
Keywords: digital DC current source; A/d Conversion; d/a conversion, and Choppe
目录
1绪论 5
前言 5
5
2 数控直流电流源设计 7
7
数控直流电流源系统设计方案比较 8
数控直流电流源只要单元器件的选择 9
电流传感器的选择 11
A/D和D/A芯片的选择 12
控制器芯片的选择 12
人机界面 13
13
电源输入EMI滤波和主电路前级整流滤波稳压电路设计 14
14
14
斩波电路与滤波稳流电路设计 16
16
稳态电流计算 17
对于储能电感铁心的选择与最小电感的计算 17
电流检测电路设计 19
电流/电压转换电路 20
隔离型电流检测电路 20
单片机最小系统的设计 20
A/D、D/A的转换电路设计 21
键盘和显示电路及辅助电源电路设计