公开(公告)号：US20210270870A1

公开(公告)日：2021-09-02

申请号：US17115662

申请日：2020-12-08

Applicant: Richtek Technology Corporation

Inventor： Isaac Y. Chen ,  Chien-Fu Tang ,  Hsin-Yi Wu ,  Kai-Chuan Chan ,  Yu-Lin Yang

IPC: G01R1/20 ,  G01R19/00 ,  G01R35/00 ,  G05F1/56 ,  G05F3/26 ,  H03F3/45

Abstract: A current sensing circuit having self-calibration includes two leads, a sensing element having a sensing resistance, and a sensing and calibration circuit. The sensing and calibration circuit senses and calibrates a sensing voltage of the sensing element, and senses a sensing current through the sensing element according to the sensing resistance and the sensing voltage, to generate a current sensing output signal. The sensing and calibration circuit includes two pads, a V2I circuit, a current mirror circuit and an I2V circuit. The sensing element has a first temperature coefficient (TC). The TC and/or the resistance of an adjusting resistor in the V2I circuit and an adjusting resistor in the I2V circuit are determined according to the first TC, such that the TC of the current sensing output signal is equal to 0.

公开(公告)号：US11169179B2

公开(公告)日：2021-11-09

申请号：US17115662

申请日：2020-12-08

Applicant: Richtek Technology Corporation

Inventor： Isaac Y. Chen ,  Chien-Fu Tang ,  Hsin-Yi Wu ,  Kai-Chuan Chan ,  Yu-Lin Yang

IPC: G01R1/20 ,  G01R19/00 ,  H03F3/45 ,  G05F1/56 ,  G05F3/26 ,  G01R35/00

Abstract: A current sensing circuit having self-calibration includes two leads, a sensing element having a sensing resistance, and a sensing and calibration circuit. The sensing and calibration circuit senses and calibrates a sensing voltage of the sensing element, and senses a sensing current through the sensing element according to the sensing resistance and the sensing voltage, to generate a current sensing output signal. The sensing and calibration circuit includes two pads, a V2I circuit, a current mirror circuit and an I2V circuit. The sensing element has a first temperature coefficient (TC). The TC and/or the resistance of an adjusting resistor in the V2I circuit and an adjusting resistor in the I2V circuit are determined according to the first TC, such that the TC of the current sensing output signal is equal to 0.