Patent ID: 6934468

Claim:
In an apparatus in which a switching part allows a power of a DC power part to be applied to a brushless DC motor comprising a rotor comprised of a permanent magnet of M pole, a stator provided with N number of teeth wound by coils and operated in K-phase, a control circuit of an independent multi-phase brushless DC motor being characterized in that the stator is constructed such that windings of K-phase wound on the teeth are independently connected, the DC power comprising of a power Vd+, Vo that is voltage-divided by an upper condenser (C) for applying power to upper switching devices and a resistance, and the Vd+, Vo corresponding to half of the DC power, and a power Vo, Vd− that is voltage-divided by a lower condenser for applying power to lower switching devices and a resistance, and corresponding to half of the DC power, K number of independent ground terminals Vo corresponding to common connection points of the cathode of the upper condenser and the anode of the lower condenser are provided, the switching part comprising an upper switching device of which one end is connected to the power Vd+, Vo, and a lower switching device of which one end is connected to the power Vo, Vd−, the upper switching device and the lower switching device being connected in series, the windings of respective phases being independently connected between a serial connection point of the two switching devices and the ground and the ground terminal Vo, and when the upper switching device is turned on, a current by the voltage of Vd− flows to Vo via the turned-on upper switching device and a corresponding winding, and when the lower switching device is turned on, the voltage of Vo flows to Vd− through the lower switching device.