一种实用的电压隔离电路

A PRACTICAL VOLTAGE ISOLATION CIRCUIT

提出了一种采用Ｖ／Ｆ、光隔、Ｆ／Ｖ转换的新型电压隔离电路。重点介绍了Ｖ／Ｆ转换器ＬＭ３３１的工作原理，给出了具有实用价值的隔离电路原理图及实验运行结果。实践证明，该电路具有电路元器件少、易于调整、线性度好、精度高（最大误差小于０．４１％）等特点，是一种通用的电压隔离电路，它可用于各种需要电位隔离的场合。

A new voltage isolation circuit which employs V/F converter, optical couplerand F/V converter is present in the paper.The operating principle of V/F IC LM331 is introduced. The practical circuit and experiment results are given. The practice shows thatthe circuit has the advantages of less elements, easy to be adjusted, good linearity and highprecision (maximum error less than 0. 41 % ). The circuit can be universally applied to theareas in which the voltage needs to be isolated.