公开(公告)号：US20170229968A1

公开(公告)日：2017-08-10

申请号：US15414420

申请日：2017-01-24

Applicant: Texas Instruments Incorporated

Inventor： Richard Lee Valley ,  Hong Huang ,  Bharath Balaji Kannan

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33507 ,  H02M2001/0019 ,  H02M2001/0032 ,  Y02B70/16

Abstract: Methods of operating switching power supplies are disclosed. A power supply has a transformer and a switch coupled to the primary side of the transformer for controlling the current flow through the primary side of the transformer. A method includes determining the output voltage of the power supply. A first minimum switching frequency is generated for driving the switch in response to the output voltage being greater than a nominal output voltage and less than a predetermined voltage. A second minimum switching frequency is generated for driving the switch in response to the output voltage being equal to or greater than the predetermined voltage, wherein the first minimum switching frequency is greater than the second minimum switching frequency.

公开(公告)号：US09985534B2

公开(公告)日：2018-05-29

申请号：US15414420

申请日：2017-01-24

Applicant: Texas Instruments Incorporated

Inventor： Richard Lee Valley ,  Hong Huang ,  Bharath Balaji Kannan

IPC: H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M2001/0019 ,  H02M2001/0032 ,  Y02B70/16

Abstract: Methods of operating switching power supplies are disclosed. A power supply has a transformer and a switch coupled to the primary side of the transformer for controlling the current flow through the primary side of the transformer. A method includes determining the output voltage of the power supply. A first minimum switching frequency is generated for driving the switch in response to the output voltage being greater than a nominal output voltage and less than a predetermined voltage. A second minimum switching frequency is generated for driving the switch in response to the output voltage being equal to or greater than the predetermined voltage, wherein the first minimum switching frequency is greater than the second minimum switching frequency.