公开(公告)号：US20210382091A1

公开(公告)日：2021-12-09

申请号：US17283860

申请日：2019-10-30

Applicant: ANALOG DEVICES, INC.

Inventor： Michael D. Petersen ,  Kalin V. Lazarov ,  Gregory J. Manlove ,  Robert Chiacchia

IPC: G01R15/14 ,  G01R19/32

Abstract: A system current sensor module can accurately sense or measure system current flowing through a sense current resistor by shunting current through a gain-setting resistor and using an amplifier to measure a resulting voltage, with an output transistor controlled by the amplifier controlling current through the gain setting resistor in a manner that tends to keep the amplifier inputs at the same voltage. The resistors can be thermally coupled to maintain similar temperatures when a system current is flowing. The thermal coupling can include conducting heat from a first resistor layer carrying the current sense resistor to a thermal cage layer located beyond a second resistor layer carrying the gain-setting resistor. This preserves accuracy, including during aging.