Patent ID: 8907656
Filing Date: 2014-12-09
Classification: G01R

Abstract:
1. An integrated current sensing apparatus comprising: a magnetic-field sensing element for sensing magnetic field and correspondingly generating a sensing voltage; a power supply circuit electrically coupled to the magnetic-field sensing element, for generating a constant current to the magnetic-field sensing element to control the sensing voltage; an offset adjustment circuit electrically coupled to the magnetic-field sensing element for adjusting an offset of the sensing voltage; a gain adjustment circuit electrically coupled to the offset adjustment circuit, for amplifying the sensing voltage to a rated output voltage; a regulating unit electrically coupled to the power supply circuit, the offset adjustment circuit and the gain adjustment circuit, for controlling the constant current, the offset and a gain value required by the gain adjustment circuit for amplifying the sensing voltage; and a temperature compensation circuit, being electrically coupled to the regulating unit, for compensating parameters individually corresponding to the constant current and the offset when temperature is changed, such that the regulating unit, when the temperature is changed, can control the power supply circuit and the offset adjustment circuit to adjust the constant current and the offset.