型号:RB520
品牌:ABB
为了实现输入输出电路上的完全隔离,近年来在控制系统中光电耦合得到广泛应用,已成为防止干扰的最有效措施之一。光电耦合器具有以下特点:首先,由于是密封在一个管壳内,不会受到外界光的干扰;其次,由于靠光传送信号,切断了各部件电路之间地线的联系;第三,发光二极管动态电阻非常小,而干扰源的内阻一般很大,能够传送到光电耦合器输入输出的干扰信号就变得很小;第四,光电耦合器的传输比和晶体管的放大倍数相比,一般很小,远不如晶体管对干扰信号那么灵敏,而光电耦合器的发光二极管只有在通过一定的电流时才能发光。因此,即使是在干扰电压幅值较高的情况下,由于没有足够的能量,仍不能使发光二极管发光,从而可以有效地抑制掉干扰信号。由于光电耦合器的线性区一般只能在某一特定的范围内,因此,应保证被传信号的变化范围始终在线性区内。为了保证线性耦合,既要严格挑选光电耦合器,又要采取相应的非线性较正措施,否则将产生较大的误差。
In order to achieve complete isolation of input and output circuits,optoelectronic coupling has been widely used in control systems in recent years and has become one of the most effective measures to prevent interference.The optocoupler has the following characteristics:first,it is sealed in a tube shell,and will not be interfered by external light;Secondly,because the signal is transmitted by light,the connection between the ground wires of each component circuit is cut off;Third,the dynamic resistance of the LED is very small,and the internal resistance of the interference source is generally large,so the interference signal that can be transmitted to the input and output of the optocoupler becomes very small;Fourthly,the transmission ratio of the optocoupler is generally very small compared with the magnification of the transistor,which is far less sensitive than the transistor to interference signals.The light-emitting diode of the optocoupler can emit light only when passing a certain current.Therefore,even when the interference voltage amplitude is high,the LED cannot emit light due to insufficient energy,so the interference signal can be effectively suppressed.Since the linear area of the optocoupler can only be within a specific range,it should be ensured that the variation range of the transmitted signal is always within the linear area.In order to ensure the linear coupling,we should not only strictly select the optocoupler,but also take the corresponding nonlinear correction measures,otherwise it will produce large errors.
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