Invention Grant
- Patent Title: Lossless average input and output current sensing in a switched-mode power supply
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Application No.: US16004536Application Date: 2018-06-11
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Publication No.: US10756614B2Publication Date: 2020-08-25
- Inventor: Stuart Pullen , Michael Bui , Steve Hawley , Chunping Song
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Patterson + Sheridan, L.L.P./Qualcomm Incorporated
- Main IPC: H02M1/00
- IPC: H02M1/00 ; H02M3/158 ; G01R31/40 ; G01R19/00 ; G11C27/02

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.
Public/Granted literature
- US20190379270A1 LOSSLESS AVERAGE INPUT AND OUTPUT CURRENT SENSING IN A SWITCHED-MODE POWER SUPPLY Public/Granted day:2019-12-12
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