公开(公告)号：US20190199199A1

公开(公告)日：2019-06-27

申请号：US16230139

申请日：2018-12-21

Applicant: Nidec Control Techniques Limited

Inventor： Mark TOWERS

IPC: H02M1/14 ,  H02P27/08 ,  H02M7/5395 ,  H02M1/32

CPC classification number: H02M1/143 ,  H02M1/32 ,  H02M5/458 ,  H02M7/5395 ,  H02M2001/327 ,  H02P27/085 ,  H03K17/693 ,  H03K2017/0806

Abstract: A method of controlling a switching frequency of a device is disclosed, the method comprising estimating a rate of temperature ripples experienced by the device; determining the total number of temperature ripples expected over a required lifetime of the device, based on the rate of temperature ripples; determining and setting a first temperature ripple limit based on the total number of temperature ripples expected over the required lifetime of the device; and controlling a switching frequency of the device based on the first temperature ripple limit.