文中对开、关机的过渡过程进行了分析，还介绍了有关欠压保护、硬件开机延时及其它保护电路的设计。

The paper analyses the transition process from start to shut of the system, and deals with the under-voltage protection, hardware start delay and the design of some other protection circuits.

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电路部分具备过流保护功能，当电流超过一定额定值时，保险丝断开机器停止工作，最大限度的保护机器安全。

Some have over-current protection circuit, when the current exceeds a certain rating, the fuse disconnects the machine to stop working to maximize the protection of machine safety.

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