继电器电路学
However, the traditional traffic signal lights are usually controlled by electric circuitry and relay. Also few of them are constructed by PLC. These configurations are complex with low reliability.
而传统的交通信号灯一般采用电子线路和继电器进行控制,也有少数采用可编程控制器(PLC)构成,结构复杂,可靠性低。
Current Surge Limiting. The circuitry necessary to protect relay contacts from excessive transient current.
电流浪涌限制保护继电器触点不受太大瞬间电流损坏的必要电路.
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