Sungkyunkwan University

Hoang Van Hung

Jae Wook Jeon

Seong Jin Cho

An apparatus and method for compensating output signals of a magnetic encoder are disclosed. The apparatus includes a pre-calibration unit, an advanced phase detector, a loop filter, a voltage controlled oscillator (VCO), and a pulse generator. The pre-calibration unit obtains two phase-compensated waveforms through trigonometric function operations, and adjusts the amplitudes of the two phase-compensated waveforms to the same value, thereby generating input sine and cosine waves. The advanced phase detector generates an error output signal through trigonometric function operations. The loop filter sets the filter transfer function of an active lead-lag filter, and then filters the error output signal. The VCO generates a compensated signal. The pulse generator outputs a phase index, and generates two output pulses having a phase difference of 90 degrees in accordance with a pulse generation rule of a look-up table.

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Suwon-si, South Korea

Hoang Van Hung