公开(公告)号：US11793463B2

公开(公告)日：2023-10-24

申请号：US17143511

申请日：2021-01-07

Applicant: EVISION TECHNOLOGY LIMITED

Inventor： Cooper Li Tak Cheung

IPC: G01L1/00 ,  A61B5/00 ,  A61B5/11 ,  G01L1/20 ,  G16H40/67

CPC classification number: A61B5/6892 ,  A61B5/1115 ,  A61B5/725 ,  A61B5/7225 ,  G01L1/205 ,  A61B2560/0223 ,  A61B2562/0247 ,  A61B2562/046 ,  A61B2562/227 ,  G16H40/67

Abstract: The present invention discloses a multi-zone pressure sensitive mat comprises a first electrode and a second electrode, wherein: the first electrode connects to an input port of a central processing unit and the second electrode connects to the digital ground return port of the central processing unit; the central processing unit comprises at least one MCU, the MCU comprises a first ADC unit and a second ADC unit, wherein electrical signal form the input port is split into original DC signal and its AC signal, wherein the DC signal is fed into the first ADC unit from the input port, the AC signal is bypassed through a capacitor from the input port, filtered through a LPF, amplified through an amplifying circuit and fed into the second ADC unit; wherein a preset threshold voltage level and a preset interval of time are stored in the MCU; the MCU detects the presence, the absence and the movement of human on bed by measuring voltage value from output port of the first ADC unit and amplitude of the AC signal from output port of the second ADC unit.

公开(公告)号：US20220211326A1

公开(公告)日：2022-07-07

申请号：US17143511

申请日：2021-01-07

Applicant: EVISION TECHNOLOGY LIMITED

Inventor： Cooper Li Tak Cheung

IPC: A61B5/00 ,  A61B5/11 ,  G01L1/20

Abstract: The present invention discloses a multi-zone pressure sensitive mat comprises a first electrode and a second electrode, wherein: the first electrode connects to an input port of a central processing unit and the second electrode connects to the digital ground return port of the central processing unit; the central processing unit comprises at least one MCU, the MCU comprises a first ADC unit and a second ADC unit, wherein electrical signal form the input port is split into original DC signal and its AC signal, wherein the DC signal is fed into the first ADC unit from the input port, the AC signal is bypassed through a capacitor from the input port, filtered through a LPF, amplified through an amplifying circuit and fed into the second ADC unit; wherein a preset threshold voltage level and a preset interval of time are stored in the MCU; the MCU detects the presence, the absence and the movement of human on bed by measuring voltage value from output port of the first ADC unit and amplitude of the AC signal from output port of the second ADC unit.