OFFSET COMPENSATION FILTER CIRCUIT IN POSITION SENSOR FOR MAGNET

摘要

PURPOSE: An offset compensation filter circuit is provided to minimize a position detection error due to DC offset while removing noise using DC offset compensation and a low pass filter of a higher priority. CONSTITUTION: An offset compensation filter circuit(200) includes a hall sensor unit(210), a compensation filter unit(230) and a zero-cross detection unit(250). The Hall sensor unit senses a magnetic field of an electronic coil in a propulsion system of an LSM and provides the sensed signal. The compensation filter unit includes a compensation unit(231) and a filter unit(233). The compensation unit provides a compensation signal in which a DC offset voltage and a noise are removed with respect to the sensed signal by receiving the sensed signal. The filter unit provides a compensation filter signal in which DC offset is removed by receiving a compensation signal from the compensation unit.