公开(公告)号：US20250085314A1

公开(公告)日：2025-03-13

申请号：US18367044

申请日：2023-09-12

Applicant: STMicroelectronics International N.V.

Inventor： Francesco BORGIOLI ,  Roberto Pio BAORDA ,  Paolo ANGELINI ,  Danilo Karim KADDOURI ,  Lorenzo ERCOLINI

IPC: G01R15/20 ,  G01R19/10

Abstract: Disclosed herein is a system for measuring current, including an input inductor and a self-test inductor through which respective input and self-test currents flow. A Hall-effect sensor circuit senses magnetic fields around these inductors, producing differential voltage outputs. These outputs are received by an input and self-test extraction circuit, which alternatingly outputs differential voltages representative of the magnetic fields around the inductors. Amplification of these differential voltages is performed by an amplifier. Sampling of the amplified differential voltages is performed by two sample/hold circuits, each designated for a specific inductor's magnetic field. An integrator circuit adjusts a voltage for the Hall effect sensor circuit, causing the gain applied to the sampled differential voltage to remain consistent and uninfluenced by the sensitivity of the Hall effect sensor circuit.