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1.光电耦合器的结构、符号及外形光电耦合器是电-光-电信号传输的传感器件,其发光体和受光体制作在同一密闭器件中,输入端为发光器件(如砷化镓发光二极管),输出端为光敏器件(如硅光电二极管或三极管)。光电耦合器的电路图形符号及外形见图1所示。当输入端有电信号时,发光二极管点燃,光线射向光电三极管,因光电效应,输出端就有亮电流输出,控制受控器件(如放大器、继电器等)。可见,这是一种以光为媒介的电信号传输方式。光电耦合器具有
1. Optocoupler structure, symbols and appearance Optocoupler is the electrical - optical - electrical signal transmission sensor device, the light-emitting body and the receiver in the same sealed device, the input for the light-emitting devices (such as gallium arsenide light Diode), the output of photosensitive devices (such as silicon photodiodes or transistors). Photocoupler circuit symbol and shape shown in Figure 1. When there is an electrical signal at the input, the light-emitting diode ignites and the light strikes the phototransistor. Because of the photoelectric effect, the output has a bright current output to control the controlled devices (such as amplifiers, relays, etc.). Can be seen that this is a light-mediated transmission of electrical signals. Optocoupler has