Analog signal linear photo-isolation is carried out by using voltage-frequency conversion and frequency-voltage conversion technique so as to effectively overcome nonlinearity of the photocoupler.

采用电压频率变换和频率电压变换技术处理模拟信号，有效的克服了光电耦合器的非线性，实现了模拟信号的线性光电隔离。

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Adopt IGBT frequency conversion of German Siemens and voltage feedback series resonance circuit. The conversion efficiency is reaching up to above 97.5%.

采用德国西门子IGBT变频，电压反馈串联谐振电路。变换效率高达97.5%以上。

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The system constitution is simplified by using gyrator transmission network to realize the live conversion of voltage and frequency, thus greatly enhancing the upper output frequency.

该方法利用回转器构成传输网络实现变压变频，使系统结构简化，且输出频率上限大幅度提高。

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