公开(公告)号：US11486914B2

公开(公告)日：2022-11-01

申请号：US17492210

申请日：2021-10-01

申请人： STMicroelectronics Asia Pacific Pte Ltd

发明人： Yannick Guedon ,  Baris Volkan Yildirim ,  Teerasak Lee

IPC分类号： G01R19/25 ,  H02J50/12

摘要： A circuit includes a tank capacitor coupled between first and second nodes, and a sense resistor having a first terminal coupled to the first node and a second terminal coupled to a regulator input. A switching circuit has first and second inputs coupled to the first and second terminals of the sense resistor. A gain stage has first and second inputs capacitively coupled to first and second outputs of the switching circuit. An analog-to-digital converter receives the output of the gain stage, and receives first and second differential voltages. A reference voltage generator has a temperature independent current source coupled to source current to a reference resistor, the first differential reference voltage being formed across the reference resistor. The reference resistor and sense resistor are located sufficiently close to one another on a single common substrate such that they remain at substantially a same temperature.

公开(公告)号：US11175319B1

公开(公告)日：2021-11-16

申请号：US17025210

申请日：2020-09-18

申请人： STMicroelectronics Asia Pacific Pte Ltd

发明人： Yannick Guedon ,  Baris Volkan Yildirim ,  Teerasak Lee

IPC分类号： G01R19/25 ,  H02J50/12

摘要： A wireless-power-transmission-system includes a bridge with a tank-capacitor coupled thereto, a sense-resistor coupled between the bridge and an input of a regulator, a switching-circuit having first and second inputs coupled across the sense-resistor, and a gain-stage having first and second inputs capacitively coupled to first and second outputs of the switching-circuit. An ADC digitizes output of the gain-stage by comparing the output to a reference voltage, and a temperature-independent current source is coupled to a reference-resistor to generate the reference voltage. In a reset-phase, the switching-circuit shorts the inputs of the gain-stage to one another, and the gain-stage shorts its inputs to its output. The switching-circuit, in a first-chopping-phase, couples the sense-resistor between the first and second inputs of the gain-stage, and in a second-chopping-phase, couples the sense-resistor in reverse between the second and first inputs of the gain-stage. The resistance of the reference-resistor tracks the sense-resistor across temperature.