Combine detailed introducing the single electrical engineering control system that a machine constitute, and pass to expand 8255 design for completing keyboard with realistic electric circuits.

并详细介绍了单片机组成的电机控制系统，以及通过扩展8255芯片完成键盘和现实电路的设计。

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The system consists of the AC input stage, single phase PFC, main inverter, output low-pass filter, auxiliary power supply, and load current sharing circuit, etc.

整个电源由输入电路、功率因数校正器、主逆变器、输出滤波电路、辅助电源、均流电路等部分组成。

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