Patent ID: 9559622
Date: 2017-01-31
CPC Classifications: H02P

Claim:
1. A motor driving device comprising: a driver that receives supply of a power supply voltage to apply a plurality of phase voltages to a motor; a voltage-division phase voltage generation portion that divides each of the phase voltages to generate a plurality of voltage-division phase voltages; a neutral point voltage generation portion that combines and divides the phase voltages to generate a neutral point voltage; a selector that selectively outputs one of the voltage-division phase voltages as a selection voltage-division phase voltage; a comparator that compares the selection voltage-division phase voltage and the neutral point voltage to generate a comparison signal; a controller that generates a selection control signal of the selector and an energization control signal of the driver according to the comparison signal; and a bias portion that applies a bias voltage, which is predetermined, as a reference voltage of the voltage-division phase voltage generation portion and the neutral point voltage generation portion, wherein the bias voltage is one half of the power supply voltage, wherein the voltage-division phase voltage generation portion includes: