公开(公告)号：US20180138853A1

公开(公告)日：2018-05-17

申请号：US15370345

申请日：2016-12-06

Applicant: DELTA ELECTRONICS, INC.

Inventor： Wei-Shuo TSENG ,  Chao-Chin CHUANG ,  Yao-Yang YU ,  Li-Wei HSIAO

IPC: H02P29/10 ,  H02P6/14 ,  H02P27/06

CPC classification number: H02P29/10 ,  H02M1/32 ,  H02M1/4225 ,  H02M2001/0022 ,  H02M2001/325 ,  H02M2001/4291 ,  H02P6/085 ,  H02P6/14 ,  H02P6/28 ,  H02P23/26 ,  H02P27/06 ,  H02P2201/07 ,  Y02B70/126 ,  Y02P80/112

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. When the control unit detects a power variation of the alternating-current input power source, the control unit controls the rotational speed of the fan to be maintained within a first error range.