MNME760-001

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描述

MNME760-001

本文介绍数字隔离放大器误差放大器,它可改进初级端控制架构的瞬态响应和工作温度范围。传统的初级端控制器应用是利用光耦合器提供反馈回路隔离,利用分流调节器提供误差放大器和基准电压。虽然光耦合器作为隔离器用于电源中具有成本低廉的优势,但它会将最大环路带宽限制在50kHz,而且实际带宽会低得多。快速可靠的数字隔离器电路在单封装内集成隔离式误差放大器和精密基准电压源功能,使用该电路可实现极低温漂和极高带宽的精密隔离式误差放大器。隔离式误差放大器能实现250kHz以上的环路带宽,使得以更高开关速度工作的隔离式初级电源设计成为可能。借助正确的电源拓扑,更高的开关速度可支持在更为紧凑的电源中使用更小的输出滤波器电感和电容。
    我们首先将讨论一个反激式转换器拓扑,因为就元器件数目而言,它是最简单的电路。反激式电路使用最少的开关;本例中,仅在初级端使用了一个开关,并在次级端使用了一个整流二极管。简单反激式电路通常用于输出功率相对较低的应用中,但它确实具有高输出纹波电流和低交越频率,因为存在右半平面(RHP)零点。结果,反激式电路需要具备较大输出纹波电流额定值的大输出电容。图1显示采用光耦合器的方式,分流调节器在其中用作隔离式输出电压Vo的反馈电压误差放大器。分流调节器用作精确标准时,可提供精度典型值为2%的基准电压。输出电压经过分压,然后由内部误差放大器将其与分流调节器的基准电压进行比较,比较结果输出至光耦合器的LED电路。光耦合器LED由输出电压和串联电阻偏置,所需的电流量根据光耦合器电流传输(CTR)特性确定。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。