As a try for circuit standardization, the system realizes the standard protection circuit unit and recovering-time circuit unit, which are connected to system through standard 44 pins' bus interface.

作为标准化的尝试，本系统实现了标准的保护电路单元和恢复时间电路单元，通过44芯总线插座与标准总线接口连接。

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ARM chip is chosen as the master chip of main control unit, main control unit includes data storage circuit and key and LCD display interface circuit besides.

主控单元的主控芯片选用了ARM芯片，并配以数据存储电路、按键和液晶显示接口电路。

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