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The electrical products industry is always the important industry in the field of industrial, is the basic industry of the level of economic development in our country. Therefore, with the rapid development of economy, it needs continually to improve some infrastructure resource allocation level of the electronic instrument and equipment of electric industry, and continuously research and development the industrial development of new technology products, thus it can improve the development the status quo of the electronic electrical industry. This paper will design a set of circuit, including current, voltage, speed sampling circuit and filter circuit. The sampling of the experimental results shows that the designed circuit has simple structure, high precision, fast response speed, which can meet the requirements of a new generation of motor variable frequency speed regulation system.

The Study on the Circuit Design and Implementation of the Low Voltage Variable Frequency Speed Regulating Device