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1、逆变及驱动电路检测电路整流电路M滤 波电 路 人机接口电路光电隔离相电流检测测转速检测计算机8051中断服务子程序初始化键盘子程序SPWM脉冲计算程序SPWM输出程序输出频率变化否开始系统初始化启动AD转换器数字滤波PID运算中断响应允许INT0中断修改T1初值运算结果等于给定值初始化片内RAM初始化SLE4520初始化时间控制8255，8253，8279T0，T1开中断置时间常数返回开始保护现场启动AD转换器，采样Un*.Un调PI子程序求频率信 号置命令时间常数，启动定时器T0，定时25ms由Uf1查表得Xf Zf恢复现场返回内部资料请勿外传9JWKffwvG#tYM*Jg&6a*CZ7H
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