DRIVING CIRCUIT OF HEAD DRUM MOTOR WITHOUT HALL SENSOR

摘要

The present invention relates to a driving circuit of a head drum motor with a hall sensor removed, and a driving transistor for applying a driving voltage to a magnet coil of the head drum motor, and an LC resonance circuit connected to one end of the magnet coil and coupled to a magnet coil. A resonant capacitor that eliminates overcurrent, and a comparator connected to the common connection point of the resonant capacitor and the magnet coil and comparing the maximum variable voltage value flowing through the magnet coil by the LC resonant circuit and inputting it to the operating voltage of the driving transistor. The capacitor is connected to one end of the magnet coil to form an LC resonant circuit, and the overvoltage fed back from the magnet coil to the comparator is used as the driving voltage of the driving transistor, thereby simplifying the switching driving circuit by eliminating the Hall sensor for head switching. Accordingly the driving circuit There is an effect capable of reducing the manufacturing cost.