The adopted control mode of previous common frequency converter is usually of open loop constant voltage ratio, which its control curve is not stable.
早期通用变频器大多为开环恒压比的控制方式，控制曲线不稳定。
Because it is very difficult to realize a frequency pattern as exponent curve rising and inverse exponent curve falling by a common hardware logical combination, so it is achieved by software.
以软件方式实现一般硬件组合逻辑难以达到的指数曲线升频和逆指数曲线降频规律。
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