Abstract: An electronically commutated fan system includes an alternating-current-to-direct-current conversion unit, an inverter unit and a control unit. The alternating-current-to-direct-current conversion unit converts an alternating-current input power source into a first direct-current power source. The inverter unit is electrically connected between the alternating-current-to-direct-current conversion unit and a fan. The inverter unit converts the first direct-current power source into an alternating-current output power source and provides the alternating-current output power source to the fan to rotate. The control unit is electrically connected to the alternating-current-to-direct-current conversion unit and the inverter unit. The control unit controls the alternating-current-to-direct-current conversion unit and the inverter unit to adjust a rotational speed of the fan.

Abstract: An electronically commutated fan system includes an alternating-current-to-direct-current conversion unit, an inverter unit and a control unit. The alternating-current-to-direct-current conversion unit converts an alternating-current input power source into a first direct-current power source. The inverter unit is electrically connected between the alternating-current-to-direct-current conversion unit and a fan. The inverter unit converts the first direct-current power source into an alternating-current output power source and provides the alternating-current output power source to the fan to rotate. The control unit is electrically connected to the alternating-current-to-direct-current conversion unit and the inverter unit. The control unit controls the alternating-current-to-direct-current conversion unit and the inverter unit to adjust a rotational speed of the fan.

Abstract: A parallel-connected power conversion system of a multi-phase generator configured to provide a power factor correction for a multi-phase generator. The parallel-connected power conversion system includes a parallel-connected power conversion apparatus and a control unit. The parallel-connected power conversion apparatus has a plurality of power conversion units connected in parallel to each other. The parallel-connected power conversion apparatus receives a plurality of generator currents and a plurality of generator voltages generated from the multi-phase generator, and outputs a DC voltage. The control unit generates a plurality of control signals to correspondingly control the power conversion units so that the generator currents linearly follow the generator voltages, therefore the power factor correction of the multi-phase generator is achieved.

Abstract: A power conversion system of a multi-phase generator used to provide a power factor correction for a multi-phase generator. The power conversion system of the multi-phase generator includes a multi-phase power conversion unit and a control unit. The multi-phase power conversion unit receives a plurality of generator voltages and a plurality of generator currents generated from the multi-phase generator, and converts the generator voltages into a DC voltage and a DC current. The control unit controls the generator currents to linearly follow the generator voltages, therefore the power factor correction for the multi-phase generator is achieved.

Abstract: A power conversion system of a multi-phase generator used to provide a power factor correction for a multi-phase generator. The power conversion system of the multi-phase generator includes a multi-phase power conversion unit and a control unit. The multi-phase power conversion unit receives a plurality of generator voltages and a plurality of generator currents generated from the multi-phase generator, and converts the generator voltages into a DC voltage and a DC current. The control unit controls the generator currents to linearly follow the generator voltages, therefore the power factor correction for the multi-phase generator is achieved.

Abstract: A parallel-connected power conversion system of a multi-phase generator configured to provide a power factor correction for a multi-phase generator. The parallel-connected power conversion system includes a parallel-connected power conversion apparatus and a control unit. The parallel-connected power conversion apparatus has a plurality of power conversion units connected in parallel to each other. The parallel-connected power conversion apparatus receives a plurality of generator currents and a plurality of generator voltages generated from the multi-phase generator, and outputs a DC voltage. The control unit generates a plurality of control signals to correspondingly control the power conversion units so that the generator currents linearly follow the generator voltages, therefore the power factor correction of the multi-phase generator is achieved.