公开(公告)号：US20190379270A1

公开(公告)日：2019-12-12

申请号：US16004536

申请日：2018-06-11

Applicant: QUALCOMM Incorporated

Inventor： Stuart PULLEN ,  Michael BUI ,  Steve HAWLEY ,  Chunping SONG

IPC: H02M1/00 ,  H02M3/158 ,  G11C27/02 ,  G01R31/40 ,  G01R19/00

Abstract: Methods and apparatus for current sensing and error correction in a switched-mode power supply composed of a high-side transistor coupled to a low-side transistor are described. One example method generally includes capturing a current associated with the low-side transistor at a first time corresponding to the low-side transistor turning off; capturing a current associated with the high-side transistor at a second time corresponding to a first delay after the high-side transistor turns on; capturing the current associated with the high-side transistor at a third time corresponding to the high-side transistor turning off; and applying a first correction current to a current-summing node of the current-sensing circuit for a first interval based on the first delay, wherein the first correction current is based on the captured current associated with the low-side transistor at the first time and on the captured current associated with the high-side transistor at the second time.

公开(公告)号：US20180331624A1

公开(公告)日：2018-11-15

申请号：US15973787

申请日：2018-05-08

Applicant: QUALCOMM Incorporated

Inventor： Stuart PULLEN ,  Michael BUI ,  Chunping SONG ,  Jialei XU

IPC: H02M3/158 ,  H02M1/088

CPC classification number: H02M3/158 ,  H02M1/088 ,  H02M3/156 ,  H02M3/1588 ,  H02M2001/0009

Abstract: Certain aspects of the present disclosure provide methods and apparatus for current sensing and error correction, or at least adjustment, for a switching regulator. One example current-sensing circuit generally includes a first amplifier, a buffer, a low-pass filter, a first switch coupled between an output of the first amplifier and an input of the buffer, a second switch coupled between the output of the first amplifier and an input of the low-pass filter, a third switch coupled between an output of the buffer and the input of the low-pass filter, and a fourth switch coupled between the input of the low-pass filter and a reference node for the circuit.