出于ESD考虑，在输入输出采用保护电路：采用保护环隔离电阻电容，减小其对核心电路的影响。
Taking into consideration of ESD, the guard ring is adopted to isolate resistors and capacitors, thus to eliminate the influence in the main circuit by them.
设计开发的电除尘器电源控制器采用ARM9系列STR912微控制器作为主控芯片，供电电源及信号输入输出模块采用光耦隔离设计方案。
Power controller adopts STR912 of ARM9 series as microcontroller, and USES the technique of optical coupling isolation within the input, output and power supply module.
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