公开(公告)号：US20180278192A1

公开(公告)日：2018-09-27

申请号：US15467711

申请日：2017-03-23

Applicant: Eaton Corporation

Inventor： Stan Rex Simms ,  John David Maurin ,  Thomas Arthur Farr

IPC: H02P27/06 ,  H02M3/158 ,  H02M7/06

CPC classification number: H02M7/06 ,  H02M2001/322

Abstract: An apparatus, such as a variable frequency drive (VFD), includes a rectifier, a DC bus coupled to an output of the rectifier and at least one capacitor coupled to the DC bus. The apparatus further includes a normally-conducting switch coupled to the DC bus and configured to discharge the at least one capacitor in a conducting state and a control circuit configured to control the normally-conducting switch responsive to an input to the rectifier. The control circuit may be configured to control the normally-conducting switch responsive to a voltage at the input of the rectifier. The control circuit may include a regulator circuit having an input coupled to the input of the rectifier and a driver circuit coupled to an output of the regulator circuit and configured to drive a control terminal of the normally-conducting switch.

公开(公告)号：US10014804B1

公开(公告)日：2018-07-03

申请号：US15644181

申请日：2017-07-07

Applicant: Eaton Corporation

Inventor： John David Maurin ,  Ryan Kenneth Keating ,  Benjamin Stewart Wells

IPC: H02P23/00 ,  H02P1/28

CPC classification number: H02P1/28

Abstract: Methods of starting a motor include coupling the motor to an AC power source via a switching circuit of a motor starter, detecting an output voltage produced by the switching circuit and responsively changing the output voltage and detecting an input voltage from the AC power source and responsively controlling a rate of change of the output voltage. Controlling the rate of change of the output voltage may include reducing a rate of increase of a magnitude of the output voltage responsive to detecting that the input voltage meets a first criterion. The methods may further include bypassing the switching circuit to connect the motor to the AC power source responsive to the output voltage meeting a second criterion or an output current provided to the motor meeting a third criterion.