Brushless DC (BLDC) motor drive circuit

摘要

The present invention provides a BLDC motor driving circuit for minimizing the power consumption in the regeneration mode and the fast forward / rewind (or seek) mode required in a tape drive device that drives a deck mechanism using a BLDC motor. It is about.;In the three-phase half-wave driving method of the prior art, since only one phase is energized at all times during motor driving, the torque of the motor cannot be increased as compared with the full-wave driving method in which two phases are energized.;In addition, since the torque constant (K _t ) of the motor can be reduced, the maximum rotational speed is fast, but there is a problem in that the power consumption is increased when the motor is reduced due to the reduced torque. Therefore, the torque of the motor can be improved than the three-phase half-wave driving method, but since two transistors are always on, the V _CE voltage drop component is doubled compared to the three-phase half-wave driving method using one transistor, contributing to motor driving. The effective voltage component was reduced by that much.;In addition, the torque constant (K _t ) of the motor is increased to increase the torque, but the disadvantage is that the maximum rotation speed is lowered.;To improve this, the present invention has been made in an effort to provide a BLDC motor driving circuit capable of increasing the maximum rotational speed of the BLDC motor in the rewinding / rewinding mode of the tape driving device and minimizing the power consumption in the regenerating mode.