Overview of RF Divide Coupler

　　In microwave systems, it is often necessary to divide a path of microwave power into several paths in proportion, which is the power allocation problem. The components that achieve this function are called power distribution components or couplers, mainly including directional couplers, power dividers, and various microwave branching devices.

　　Optocoupler is an electrical optical electrical conversion device that uses light as a medium to transmit electrical signals. It consists of two parts: a light source and a light receiver. Assemble the light emitting source and the light receiving device in the same sealed housing, and isolate them from each other with a transparent insulator. The pin of the light source is the input terminal, and the pin of the light receiver is the output terminal. Common light sources are light emitting diodes, and light receivers are photodiodes, phototransistors, and so on. There are many types of optocouplers, including photodiode type, phototransistor type, photoresistor type, photo controlled thyristor type, optoelectronic Darlington type, integrated circuit type, etc.

　　Principle:

　　A is four sets of analog electronic switches (S1-S4): S1, S2, S3 are connected in parallel (to increase driving power and anti-interference ability) for the delay circuit. When it is powered on, it drives the bidirectional thyristor VT through R4 and B6, which directly controls the hall lighting H; S4 and external photoresistor Rl form an environmental light detection circuit. When the door is closed, the normally closed reed switch KD installed on the door frame is subjected to the action of the magnet on the door, and its contacts are disconnected, with S1, S2, and S3 in the data open state.

　　When opened, the magnet moves away from KD and the KD contact closes. At this time, the 9V power supply is rectified and charged to C1 through R1. The voltage at both ends of C1 quickly rises to 9V. The rectified voltage, through S1, S2, S3, and R4, causes the light-emitting tube in B6 to emit light, triggering the bidirectional thyristor to conduct. VT also conducts, and H lights up, achieving automatic lighting control.

　　After the door is closed, the magnet controls KD, the contacts are disconnected, the 9V power supply stops charging C1, and the circuit enters a delay state. C1 begins to discharge R3, and after a delay, the voltage at both ends of C1 gradually drops below the turn-on voltage (1.5v) of S1, S2, and S3. S1, S2, and S3 return to the disconnected state, causing B6 to turn off, VT to turn off, and H to turn off, achieving the delayed light off function.

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