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WO2025183271A1 - Procédé de commande de faible puissance pour dispositif pouvant être porté utilisant un capteur de photopléthysmographie - Google Patents

Procédé de commande de faible puissance pour dispositif pouvant être porté utilisant un capteur de photopléthysmographie

Info

Publication number
WO2025183271A1
WO2025183271A1 PCT/KR2024/008583 KR2024008583W WO2025183271A1 WO 2025183271 A1 WO2025183271 A1 WO 2025183271A1 KR 2024008583 W KR2024008583 W KR 2024008583W WO 2025183271 A1 WO2025183271 A1 WO 2025183271A1
Authority
WO
WIPO (PCT)
Prior art keywords
wearable device
heart rate
oxygen saturation
led
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/KR2024/008583
Other languages
English (en)
Korean (ko)
Inventor
서연호
이성철
박원기
박윤수
이연호
전병찬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Electronics Technology Institute
Original Assignee
Korea Electronics Technology Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020240055954A external-priority patent/KR20250132317A/ko
Application filed by Korea Electronics Technology Institute filed Critical Korea Electronics Technology Institute
Publication of WO2025183271A1 publication Critical patent/WO2025183271A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using optical sensors, e.g. spectral photometrical oximeters

Definitions

  • the present invention relates to control of a wearable device, and more particularly, to a method for controlling low-power mode operation in a wearable device that must measure proximity, heart rate, and oxygen saturation using a PPG (PhotoPlethysmoGraphy) sensor.
  • PPG PhotoPlethysmoGraphy
  • Wearable devices such as clothing, watches, and accessories, are devices that can be worn on the body. Because they operate on batteries, they require control algorithms for low-power operation, such as sleep/standby mode and shutdown mode, to ensure long-term operation after a single charge. Typically, wearable devices use proximity sensors to determine whether they are being worn and switch to sleep/standby mode when not in use, thereby reducing battery consumption and extending usage time.
  • the present invention has been devised to solve the above problems, and the purpose of the present invention is to provide a method for controlling low-power operation of a wearable device through operation of multiple stages of modes depending on the bio-signal detection situation of the wearable device, breaking away from the fragmented existing method of relying only on a single proximity sensor for low-power control of a wearable device.
  • a method for controlling a wearable device for achieving the above object includes: a step of detecting proximity of a human body to a wearable device; a first attempt step of attempting to measure a heartbeat when proximity of a human body is detected; and a second attempt step of attempting to measure oxygen saturation when the heartbeat is measured.
  • the detection step may be performed by turning on the IR-LED and photo-diode that make up the PPG sensor and activating the proximity sensing module within the processor.
  • the first attempt step may be performed by activating a DC feedback circuit to remove DC from the detection signal of the photodiode and a heart rate sensing module within the processor.
  • the wearable device control method according to the present invention may further include a step of deactivating a DC feedback circuit and a heart rate sensing module within the processor if a heart rate is not measured after the first attempt step.
  • the second attempt step may be performed by turning on the RED LED constituting the PPG sensor and activating the oxygen saturation sensing module within the processor.
  • the wearable device control method according to the present invention may further include a step of turning off the RED LED and deactivating the oxygen saturation sensing module within the processor if the oxygen saturation is not measured after the second attempt step.
  • a wearable device control method may further include a step of determining whether a heartbeat amplitude is within a predetermined range when oxygen saturation is measured; and a step of continuously measuring a heartbeat and oxygen saturation if the heartbeat amplitude is within the predetermined range.
  • the judgment step may be performed by turning on the GREEN LED that constitutes the PPG sensor.
  • the wearable device control method according to the present invention may further include a step of adjusting the intensity of the RED LED and the GREEN LED if the heartbeat amplitude is not within a predetermined range.
  • a method for controlling a wearable device comprising: a multi-LED including a plurality of LEDs; a photodiode detecting light reflected from a human body after being irradiated by the multi-LED; and a processor detecting proximity of the wearable device to a human body based on a detection result of the photodiode, attempting to measure a heartbeat when proximity of the human body is detected, and attempting to measure oxygen saturation when the heartbeat is measured.
  • a wearable device characterized by including a first attempt step of attempting to measure a heart rate; if the heart rate is measured, a second attempt step of attempting to measure oxygen saturation; if the oxygen saturation is measured, a step of determining whether the heart rate amplitude is within a predetermined range; and if the heart rate amplitude is within the predetermined range, a step of continuously measuring the heart rate and oxygen saturation.
  • a wearable device comprising: a multi-LED including a plurality of LEDs; a photodiode detecting light reflected from a human body after being irradiated by the multi-LED; and a processor configured to attempt to measure a heart rate based on a detection result of the photodiode, attempt to measure oxygen saturation when the heart rate is measured, determine whether the heart rate amplitude is within a predetermined range when the oxygen saturation is measured, and continue to measure the heart rate and oxygen saturation when the heart rate amplitude is within the predetermined range.
  • the LEDs and processor modules are selectively turned on/activated through multiple mode operations by distinguishing them according to the bio-signal detection situation in the wearable device, thereby controlling low-power operation of the wearable device, thereby reducing battery consumption of the wearable device and maximizing its usage time.
  • Figure 1 is a configuration of a wearable device with a built-in PPG sensor according to one embodiment of the present invention.
  • Figures 2 and 3 are diagrams illustrating the flow of a low-power/optimized control method for a wearable device using a PPG sensor.
  • An embodiment of the present invention proposes a low-power control method for a wearable device using a PhotoPlethysmography (PPG) sensor.
  • PPG PhotoPlethysmography
  • the low-power operation of the wearable device is controlled through operation in multiple stages of modes by distinguishing between LEDs and processor modules depending on the bio-signal detection situation of the wearable device.
  • a PPG sensor is utilized to detect whether the wearable device is being worn.
  • FIG. 1 is a diagram illustrating the configuration of a wearable device with a built-in PPG sensor according to one embodiment of the present invention.
  • a wearable device is configured to include, as illustrated, a multi-LED (110), an LED driver (120), a DC feedback circuit (130), a photodiode (140), an AFE (Analog Front End, 150), an ADC (Analog-to-Digital Converter, 160), and a DSP (Digital Signal Processor, 170).
  • a multi-LED 110
  • an LED driver 120
  • a DC feedback circuit 130
  • a photodiode 140
  • An AFE Analog Front End
  • ADC Analog-to-Digital Converter
  • DSP Digital Signal Processor
  • the multi-LED (110) and photodiode (140) are components for implementing a PPG sensor for measuring heart rate and oxygen saturation.
  • the multi-LED (110) includes an IR-LED, a RED-LED, and a GREEN-LED.
  • the LED driver (120) applies driving current to the IR-LED, RED-LED, and GREEN-LED constituting the multi-LED (110).
  • the driving current by the LED driver (120) is controlled by the DSP (170) described later.
  • the photodiode (140) is a sensor for detecting an optical signal reflected from the human body after being emitted from the multi-LED (110).
  • the DC feedback circuit (130) is a circuit for removing the DC component from the optical signal detected by the photodiode (140).
  • the AFE (150) performs necessary analog signal processing, such as amplification and filtering, on the detection signal of the photodiode (140).
  • the ADC (160) converts the analog signal processed by the AFE (150) into a digital signal and transmits it to the DSP (170).
  • the DSP (170) performs human proximity detection, heart rate measurement, and oxygen saturation measurement through digital signal processing on the detection signal of the photodiode (140) converted into a digital signal by the ADC (160), and the DSP (170) controls the driving of the multi-LED (110) by the LED driver (120) and the operation of the DC feedback circuit (130) and the AFE (150).
  • the DSP (170) performing such a function is configured to include an optimization module (171), an oxygen saturation sensing module (172), a heart rate sensing module (173), and a proximity sensing module (174), as shown in FIG. 1.
  • the optimization module (171) controls the driving current of the multi-LED (110) generated by the LED driver (120), thereby controlling the intensity of the light emitted from the IR-LED, RED-LED, and GREEN-LED constituting the multi-LED (110).
  • the proximity sensing module (174) detects the proximity of a human body based on the intensity of the IR detection signal by the photodiode (140).
  • the heart rate sensing module (173) detects a heart rate from a detection signal by a photodiode (140) and measures the heart rate amplitude.
  • the oxygen saturation sensing module (172) measures oxygen saturation from a detection signal by a photodiode (140).
  • FIGS. 2 and 3 are diagrams illustrating the flow of a low-power/optimized control method for a wearable device using a PPG sensor.
  • an IR signal is detected to detect the proximity of a human body to a wearable device (S210).
  • the IR signal is a light signal that is emitted from the IR-LED of the multi-LED (110), reflected from the human body, and detected by the photo-diode (140).
  • the IR-LED, photo-diode (140), AFE (150), and ADC (160) of the multi-LED (110) in the wearable device are always turned on.
  • the optimization module (171) and the proximity sensing module (174) are enabled in the DSP (170).
  • the wearable device When the proximity of a human body is detected, for example, when a human body approaches the wearable device within 5 mm (S220-Y), the wearable device attempts to measure a heart rate (S230). To perform step S230, the DSP (170) turns on the DC feedback circuit (130) and enables the heart rate sensing module (173).
  • step S220 if the proximity of a human body is not detected in step S220 (S220-N), it returns to step S210.
  • step S230 the wearable device attempts to measure oxygen saturation (S250).
  • step S250 the DSP (170) turns on the RED LED of the multi-LED (110) and enables the oxygen saturation sensing module (172).
  • step S240 the DSP (170) turns off the DC feedback circuit (130), disables the heart rate sensing module (173) (S260), and returns to step S210.
  • the DSP (170) turns off the DC feedback circuit (130), disables the heart rate sensing module (173) (S260), and returns to step S210.
  • This case applies when the heart rate is not measured due to proximity to an object other than the human body, such as when the wearable device is placed on a desk or the like.
  • step S250 When oxygen saturation is measured by performing step S250 (S310-Y), the wearable device attempts to measure heartbeat amplitude (S320). To perform step S320, the DSP (170) turns on the GREEN LED of the multi-LED (110).
  • step S310 if oxygen saturation is not measured in step S310 (S310-N), the RED LED of the multi-LED (110) is turned off, the oxygen saturation sensing module (172) is disabled (S330), and the process returns to step S240 of FIG. 2.
  • the optimization module (171) of the DSP (170) maintains the driving current of the RED-LED and GREEN-LED as is (S350).
  • the optimization module (171) of the DSP (170) adjusts the driving current of the RED-LED and GREEN-LED of the multi-LED (110) so that the heartbeat amplitude is within the operating range (S360). If the wearable device strongly presses the human body, i.e., if the wearable device is tightly tied, the heartbeat amplitude may be out of the operating range, and in this case, the LES intensity is adjusted to adjust the amplitude within the operating range.
  • Wearable devices are always worn, so battery operation is essential. However, since they are equipped with a circuit for measuring bio-signals to check health status, battery consumption increases rapidly.
  • the LEDs and processor modules are selectively activated through operation in multiple stages of mode by distinguishing them according to the bio-signal detection situation in the wearable device, thereby controlling the low-power operation of the wearable device, thereby reducing the battery consumption of the wearable device and maximizing the usage time.
  • the technical idea of the present invention can also be applied to a computer-readable recording medium containing a computer program that performs the functions of the device and method according to the present embodiment.
  • the technical idea according to various embodiments of the present invention can be implemented in the form of computer-readable code recorded on a computer-readable recording medium.
  • the computer-readable recording medium can be any data storage device that can be read by a computer and store data.
  • the computer-readable recording medium can be a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical disk, a hard disk drive, etc.
  • the computer-readable code or program stored on the computer-readable recording medium can be transmitted through a network connected between computers.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Molecular Biology (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Physiology (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un procédé de commande de faible puissance pour un dispositif pouvant être porté à l'aide d'un capteur PPG. Un procédé de commande d'un dispositif pouvant être porté selon un mode de réalisation de la présente invention consiste à : détecter la proximité d'un corps humain par rapport au dispositif pouvant être porté ; tenter une mesure de battement de cœur lorsque la proximité du corps humain est détectée ; tenter une mesure de saturation en oxygène lorsque le battement de cœur est mesuré ; et maintenir une amplitude de battement de cœur dans une plage prédéterminée lorsque la saturation en oxygène est mesurée. En conséquence, sur la base de l'état de détection de signal biologique dans le dispositif pouvant être porté, des modules de DEL et des modules de processeur peuvent être mis en service ou activés sélectivement d'une manière distinguable par l'intermédiaire d'opérations de mode à étapes multiples de façon à commander le fonctionnement à faible puissance du dispositif pouvant être porté, ce qui permet de réduire la consommation de batterie et de maximiser le temps d'utilisation de celui-ci.
PCT/KR2024/008583 2024-02-28 2024-06-21 Procédé de commande de faible puissance pour dispositif pouvant être porté utilisant un capteur de photopléthysmographie Pending WO2025183271A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2024-0028485 2024-02-28
KR20240028485 2024-02-28
KR1020240055954A KR20250132317A (ko) 2024-02-28 2024-04-26 Ppg 센서를 사용하는 웨어러블 기기를 위한 저전력 제어 방법
KR10-2024-0055954 2024-04-26

Publications (1)

Publication Number Publication Date
WO2025183271A1 true WO2025183271A1 (fr) 2025-09-04

Family

ID=96921085

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2024/008583 Pending WO2025183271A1 (fr) 2024-02-28 2024-06-21 Procédé de commande de faible puissance pour dispositif pouvant être porté utilisant un capteur de photopléthysmographie

Country Status (1)

Country Link
WO (1) WO2025183271A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160109690A (ko) * 2015-03-12 2016-09-21 크루셜텍 (주) 맥박 센싱 모듈, 이를 포함하는 사용자 단말기, 및 사용자 단말기의 맥박 센싱 방법
US9723997B1 (en) * 2014-09-26 2017-08-08 Apple Inc. Electronic device that computes health data
KR20170103558A (ko) * 2016-03-04 2017-09-13 삼성전자주식회사 생체 정보를 측정하는 전자 장치와 이의 동작 방법
JP2019526293A (ja) * 2016-08-26 2019-09-19 京東方科技集團股▲ふん▼有限公司Ｂｏｅ Ｔｅｃｈｎｏｌｏｇｙ Ｇｒｏｕｐ Ｃｏ．，Ｌｔｄ． 心拍数測定方法、心拍数測定装置及び装着可能装置
KR20220053364A (ko) * 2020-10-22 2022-04-29 삼성전자주식회사 생체 정보 측정을 위한 웨어러블 디바이스 및 방법
KR20220141487A (ko) * 2021-04-13 2022-10-20 삼성전자주식회사 생체 정보 검출 방법 및 이를 지원하는 전자 장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9723997B1 (en) * 2014-09-26 2017-08-08 Apple Inc. Electronic device that computes health data
KR20160109690A (ko) * 2015-03-12 2016-09-21 크루셜텍 (주) 맥박 센싱 모듈, 이를 포함하는 사용자 단말기, 및 사용자 단말기의 맥박 센싱 방법
KR20170103558A (ko) * 2016-03-04 2017-09-13 삼성전자주식회사 생체 정보를 측정하는 전자 장치와 이의 동작 방법
JP2019526293A (ja) * 2016-08-26 2019-09-19 京東方科技集團股▲ふん▼有限公司Ｂｏｅ Ｔｅｃｈｎｏｌｏｇｙ Ｇｒｏｕｐ Ｃｏ．，Ｌｔｄ． 心拍数測定方法、心拍数測定装置及び装着可能装置
KR20220053364A (ko) * 2020-10-22 2022-04-29 삼성전자주식회사 생체 정보 측정을 위한 웨어러블 디바이스 및 방법
KR20220141487A (ko) * 2021-04-13 2022-10-20 삼성전자주식회사 생체 정보 검출 방법 및 이를 지원하는 전자 장치

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