FILTER FOR REMOVING NOISE OF OUTPUT PULSE IN ENCODER

摘要

PURPOSE: A filter for removing noise of an output pulse in an encoder is provided to prevent a malfunction of a motor by removing noise included in an output pulse of an encoder. CONSTITUTION: A signal and power separation portion(1) is used for separating a pulse signal of an encoder from a ground by using a photo coupler. A low pass filter portion(2) is used for removing noise from an output pulse of the encoder by using an RC circuit. A schmitt trigger circuit portion(3) is used for compensating for a width of an input pulse of the signal and power separation portion(1) and a width of the output pulse passing the low pass filter portion(2) in order to equalize the input pulse width of the signal and power separation portion(1) and the output pulse width passing the low pass filter portion(2). An impedance matching portion(4) is used for matching an output impedance.