Patent ID: 11863110
Assignee: LX SEMICON CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A brushless direct current (BLDC) motor driver comprising:
a BLDC motor including a first coil, a second coil, and a third coil;
a comparator which compares a voltage of each of the first to third coils with a neutral voltage of a node commonly connected to the first to third coils in the BLDC motor and outputs a comparison result;
a controller which detects a zero crossing time point of a back-electro motive force of each of the first coil, the second coil, and the third coil using the comparison result of the comparator and generates first to third coil control signals using the detected zero crossing time points and a turn-on time and a transition time in an optimum driving mode; and
an inverter which supplies a first power voltage or second power voltage to each of the first to third coils or floats the corresponding coil in response to the first to third coil control signals,
wherein the controller repeatedly performs a process of driving the BLDC motor and detecting a driving error of the BLDC motor while adjusting a turn-on time and a transition time in a test mode step by step, and when the driving error is detected, sets a turn-on time and a transition time, which are adjusted in a previous operation, as the turn-on time and the transition time in the optimum driving mode.