公开(公告)号：US20170214310A1

公开(公告)日：2017-07-27

申请号：US15125325

申请日：2014-03-19

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Di ZHANG ,  Luis Jose GARCES ,  Andrew Allen ROCKHILL

IPC: H02M1/08 ,  H02M7/539 ,  H02M7/525 ,  H02M7/155 ,  H02M7/217

CPC classification number: H02M1/083 ,  H02M7/1557 ,  H02M7/217 ,  H02M7/487 ,  H02M7/5152 ,  H02M7/525 ,  H02M7/539 ,  H02M7/7575 ,  H02M2007/4835 ,  Y02E60/60

Abstract: A method for power conversion includes coupling a first string to a second string via a first connecting node and a second connecting node to form at least one leg of a power converter. The first string is operatively coupled across a first bus and a second bus and comprises a first branch and a second branch coupled via a third connecting node. The first branch and the second branch include a plurality of controllable semiconductor switches. Furthermore, the second string comprises a first chain link and a second chain link coupled via an alternating current phase bus and includes a plurality of switching units. The first chain link and/or the second chain link are controlled to generate a negative voltage across at least one of the plurality of controllable semiconductor switches during a switch turn off process.

公开(公告)号：US20180367051A1

公开(公告)日：2018-12-20

申请号：US16061717

申请日：2016-01-15

Applicant: General Electric Company

Inventor： Mohammed AGAMY ,  Dong DONG ,  Yan PAN ,  Luis Jose GARCES

IPC: H02M3/335 ,  H02M3/337 ,  H02M1/088

CPC classification number: H02M3/33584 ,  H02M1/088 ,  H02M3/3376 ,  H02M2001/0058 ,  H02M2001/348 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A direct current (DC) to DC power converter includes a first bus converter for converting a first DC bus voltage into a first high frequency AC voltage and a second bus converter for converting a second high frequency alternating current (AC) voltage into a second DC bus voltage. The DC to DC converter also includes a resonant circuit for coupling the first bus converter and the second bus converter and a controller for providing switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode. The controller includes a switching frequency controller for determining a switching frequency signal for the power converter based on a reference output current and a phase shift controller for determining a phase shift signal for the power converter. When the reference output current is lower than the a first load current value the switching frequency signal is maintained at a first switching frequency and the phase shift is determined according to the reference output current. Further, when the reference output current is above a second load current value the switching frequency signal is maintained at a second switching frequency and the phase shift is determined according to the reference output current. When the reference output current is between the first load current value and the second load current value, the switching frequency signal is adjusted according to a value of the reference output current and the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current.