Optical Transient Interference Solution

How to solve the problem of optical transceiver transient interference?

1. Generation of Transient Interference: Transient interference is caused by large inductive loads, such as the switching of motors, transformers, relays, and other devices, and in the process of lightning, it often invades the optical transceiver by electrostatic induction.

2. The hazard of transient interference: Because it interferes with high frequency, short duration, large interference amplitude (hundreds of kilovolts), it can burn out the key parts of optical transceiver RS-485 interface chip, main chip, etc. The traces, especially during the thunderstorm season in summer, have a great impact on this destructive force, causing users, businesses and manufacturers to be very troublesome.

3. Countermeasures: Although the optical transceiver manufacturers use various protection methods, such as bypass method (self-healing diode), absorption method (bidirectional suppression diode, etc.), isolation method (optocoupler isolation), but still can not completely eliminate the transient Damage caused by interference, RS-485 interface is frequently damaged, causing great pressure on users and manufacturers.

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