MVME167-004B

MVME167-004B

MVME167-004B 光耦合器以光为媒介传输电信号。它对输入、输出电信号有良好的隔离作用。光耦一般由三部分组成：光的发射、光的接收及信号放大。输入的电信号驱动发光二极管(LED)，使之发出波长的光，被光探测器接收而产生光电流，再经过进一步放大后输出。这就完成了电—光—电的转换，从而起到输入、输出、隔离的作用。由于光耦输入输出间互相隔离，电信号传输具有单向性等特点，因而具有良好的电绝缘能力和抗干扰能力。又由于光耦的输入端属于电流型工作的低阻元件，因而具有很强的共模抑制能力。所以，它在长线传输信息中作为终端隔离元件可以大大提高信噪比。

光耦主要用于电平隔离，所谓隔离主要是指输入部分和输出部分之间没有直接的电路连接，即在信号的传输过程中输入与输出没有公共的地端。

MVME167-004B 

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