CN202939773U - Human body falling monitoring device based on acceleration and height information - Google Patents

Abstract

The utility model discloses a human body falling monitoring device based on acceleration and height information. The device comprises a sensing module, a processing control module, a communication module, a wearing detecting module and a power supply module; the sensing module with an accelerometer and an altimeter is connected with the processing control module based on a low power consumption single chip microcomputer for continuously monitoring the acceleration and height changes in daily activities of a wearer; the wearing monitoring module detects the wearing way of the device; when falling of the wearer is judged according to the collected acceleration and height data, the processing control module starts a Bluetooth communication module for giving alarm information; and a wearing button which can be placed in a belt of the wearer is provided with a magnetic body, such that whether the device is positioned and worn can be detected by the device per se. The human body falling monitoring device based on the acceleration and height information has the advantages that falling can be timely and accurately found out according to the continuously monitored acceleration and height information; and energy consumption is reduced with low power consumption design and high efficiency management, such that demands of long-time continuous working can be achieved.

Description

Human body fall monitoring device based on acceleration and elevation information

Technical field

The utility model relates to a kind of human body fall monitoring device based on acceleration and elevation information, is specifically related to a kind ofly can survey for a long time, constantly whether the fall device of process of human body, mainly is applicable to the fall monitoring to the elderly.

Background technology

Enter 21 century, aging population will be more for appearing.Along with exchanging of expanding economy and culture, the mobility of population is accelerated greatly, makes a lot of children the old man not at one's side.Thereby the elderly's health and medical treatment and nursing problem thereof become a significant problem gradually, and most the elderlys' health status can't in time be monitored.When meeting accident, if the elderly can not get instant relief, even can threaten life security.And fall, generation is often arranged in elderly population.

Falling of old man can cause a lot of safety problems, and 5%～15% fall causes brain injury, soft tissue injury, fracture and dislocation etc., and wherein the most serious is Hip Fracture.

Existing fall detection technology can be divided three classes: based on the fall detection system of video, based on the fall detection system of acoustics, based on the fall detection system of Wearable sensor.

Fall detection system based on video is that camera is installed in certain area, takes the picture of physical activity.Method by image is processed detects the generation of whether falling;

That sound signal when falling by analysis detects based on the fall detection system of acoustics;

Fall detection system based on the Wearable sensor, the micro device that finger will contain the signal perceptional function of falling is arranged on the checkout equipment that is suitable in clothing that human body dresses, as clothes, cap, jewellery etc., whether to fall by monitoring human activity condition detection.

Fall detection system based on video is subject to region limits; Fall detection system accuracy rate based on acoustics has much room for improvement relatively.Existing fall detection mode based on the Wearable sensor is convenient, the most universal a kind of detection mode, and it detects, and principle is simple, method research is more and the tool practicality.Based on the existing more example of the detection system of Wearable sensor, such as CN2168586Y etc.CN2249072Y is the detection of mainly falling based on mercury cut-off; CN201127606Y etc. only utilize acceleration information to carry out the mode of fall detection; The CN102136180A scheme is too complicated, except two accelerometers, also needs two gyroscopes, and needs grouping to be worn on two positions, uses inconvenience and has improved cost.The main deficiency of existing Wearable fall detection method is that the power consumption of system is generally larger comparatively speaking, be difficult to continue for a long time detecting/monitoring, technical mainly based on acceleration and angle change information in fall detection, do not utilize the human body middle height change information that must occur of falling, thereby the aspects such as convenience of the accuracy that detects and reliability and device use have much room for improvement all.

Present stage these subject matters of especially existing for the detection technique of Falls in Old People of human body fall monitoring technology, identify namely also that accuracy is not high, reason makes relevant apparatus can't carry out long-time continuous and effective monitoring problem because battery capacity is limited etc., greatly reduces the practicality of this class device.Therefore, be necessary to design a kind of new human body fall monitoring device.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of human body fall monitoring device based on acceleration and elevation information, should have advantages of that monitoring precision was high based on the human body fall monitoring device of acceleration and elevation information.

The technical solution of utility model is as follows:

A kind of human body fall monitoring device based on acceleration and elevation information, comprise in the monitoring modular that is integrated with altitude gauge, accelerometer, communication module and single-chip microcomputer, described altitude gauge and accelerometer all are connected with single-chip microcomputer by the SPI communication port, and communication module is connected with single-chip microcomputer.

Described human body fall monitoring device also comprises the wearing mode checking module; The wearing mode checking module comprises tongue tube and the pull down resistor of detaining and being integrated in described monitoring modular of wearing with magnet for the described monitoring modular of plug-in mounting; Described tongue tube and pull down resistor are connected between the output terminal and ground of the first analog switch that input end is connected with positive source, the power supply of the branch road that tongue tube connects with pull down resistor is controlled by the first analog switch that is controlled by single-chip microcomputer, and the tie point of tongue tube and pull down resistor connects an input port of single-chip microcomputer.[this makes the wearing mode of device detect can only just supply electro-detection when single-chip microcomputer need to be confirmed wearing mode, to save electric energy.】

Described accelerometer adopts the integrated tri-axial acceleration meter ADXL362 with motion triggers arousal function, described height is counted integrated high precision barometric altimeter MS5611, tongue tube is the serial dried reed pipe of CT05, single-chip microcomputer is MSP430F5510, communication module makes system realize continuing to monitor with low-power consumption for the selected accelerometer of wireless communication module WB2540.[, altitude gauge and the single-chip microcomputer of supporting bluetooth 4.0 communication standards is the microampere order low energy-consumption electronic device.】

The power module of powering for described detection module comprises a Charge Management interface (MAX1551) and two-way power supply, wherein, first via power supply is the communication module power supply, the the second road power supply is single-chip microcomputer, wearing mode checking module and accelerometer power supply (altitude gauge is by the input/output port power supply of single-chip microcomputer), is serially connected with the second analog switch that is controlled by single-chip microcomputer in the path of first via power supply.

Be somebody's turn to do method corresponding to human body fall monitoring device based on acceleration and elevation information: wear accelerometer, altitude gauge and single-chip microcomputer by monitored human body, single-chip microcomputer is acceleration change and the height change information by accelerometer and altitude gauge human body respectively, when accekeration being detected and surpass acceleration rate threshold and height change value and surpass the height change threshold value, judge that the wearer has occured to fall, and send warning by communication module.

Also the detection by wearing mode further strengthens detection accuracy; The detection of wearing mode realizes by the following method:

wear to buckle at one and be fixed with a magnet, be integrated with altitude gauge, accelerometer, the monitoring modular of tongue tube and single-chip microcomputer is inserted into to wear when buckling and (is the fixed point wearing mode this moment), tongue tube is subjected to the magnetic action of described magnet and conducting [conducting when magnetic fields is arranged of the tongue tube of open type], otherwise, when being inserted into, described monitoring modular do not wear (this situation is random wearing mode) when buckling, the state of tongue tube is for disconnecting, the level that single-chip microcomputer detects the pull down resistor place connect with tongue tube can judge just whether described monitoring modular is the wearing mode of fixing a point.

In order can in time to survey the human motion abnormal information and to save electric energy, described accelerometer adopts the integrated tri-axial acceleration meter ADXL362 with motion triggers arousal function, and but this accelerometer is in the low power mode of operation of perceive motion under normal conditions, to continue to monitor acceleration change; Single-chip microcomputer is arranged on and wakes mode of operation up: namely output signal triggers single-chip microcomputer and just enters duty when accelerometer perceives exercise intensity over setting value, otherwise is in dormant state; Altitude gauge is in power-down mode under normal conditions, after single-chip microcomputer is waken up, is powered to altitude gauge by the output port of single-chip microcomputer, makes altitude gauge enter mode of operation, coordinates with accelerometer, gathers simultaneously acceleration and height change data.

Described accelerometer is three axis accelerometer, close resultant height amplitude when changing the situation of superthresholds all when acceleration being detected, for improving the accuracy that detects, also based on the unchangeability of acceleration of gravity size and Orientation, three volume coordinate direction of principal axis (X that recorded during superthreshold by three axis accelerometer, Y, Z) component first make low-pass filtering, then ask to close and vow and to obtain the angle that in the accelerometer three-coordinate that rotates with human body acceleration of gravity vector and human motion acceleration close arrow; Confirm further that when the intensity of variation superthreshold of this angle the device wearer has occured to fall.

Human body fall monitoring device based on acceleration and elevation information is characterized in that comprising sensing module, processing and control module, communication module, power module and wear detection module.Processing and control module based on low-power scm is connected with the sensing module that is comprised of low energy-consumption electronic device, acceleration and height change information data when gathering the human body daily routines, and the wearing mode of pick-up unit; Adopt the communication module of blue teeth wireless mode to be connected with processing and control module, when judging the device wearer according to institute's image data and fall, processing and control module is enabled bluetooth communication transmission warning message; According to the different demands of device each several part to power supply, power module provides two tunnel different outputs of the load current ability, and provide controlled power supply to different parts, directly power supply and three kinds of modes of single-chip processor i/o confession electricity under Single-chip Controlling, realize the high energy efficiency power management, reduce system power dissipation, increase its cruising time.Whether processing and control module is analyzed acceleration and altitude information that sensing module records, fall by judging the wearer by the data processor of different wearing modes, falls when judgement and controls communication module transmission warning message when occuring.Wear the wearing mode information that button is used for testing fixture, to select data acquisition and processing mode, reach energy-conservation purpose.Can be placed in wearing of wearer's underpants or waistband and buckle and contain magnet, whether device can be checked oneself is fixedly to wear.

Sensing module mainly is comprised of the integrated tri-axial acceleration meter of a slice super low-power consumption and the integrated barometric altimeter of a slice low power consumption high-precision, and the accelerometer of directly being powered by power module operates mainly under energy-conservation motion triggers awakening mode.When acceleration signal surpass to be set limit (1.2 ~ 1.4g, g are acceleration of gravity), accelerometer output look-at-me was waken up by directly power supply but generally be in the single-chip microcomputer of low-power consumption park mode of power supply; Barometric altimeter is in off position under normal circumstances, after the accelerated degree meter of single-chip microcomputer signal wakes up, is the barometric altimeter power supply by the single-chip processor i/o mouth, starts altitude gauge and gathers height change information.Wear detection module what check wearing mode, the power supply of magnetosensitive device is controlled by analog switch I by single-chip microcomputer, just to the magnetosensitive device power supply, inquires about its output state by single-chip microcomputer when needs are understood wearing mode information, determine the device wearing mode.It is μ A level integrated device that described three axis accelerometer and described barometric altimeter require the selection work electric current, and the magnetosensitive device of described detection wearing mode is the tongue tube of Switch, and making its power consumption is μ W level, and this device consumed energy not when disconnecting.

Processing and control module is based on MSP430 series super low power consuming single chip processor, and it includes the multiple interfaces such as real-time clock and SPI.The time that provides according to real-time clock, single-chip microcomputer is by handling accordingly to different period sensing module image data, when judging that according to the analysis to human motion acceleration and height change amplitude event is fallen in confirmation, starting feed regulator isolator II by analog switch II is the bluetooth communication power supply, makes it send warning message.Wherein the processing of acceleration signal comprised human motion acceleration resultant vector (closing arrow)

Calculating, Calculate with the angle of acceleration of gravity vector, and judge variable angle analysis between former and later two states of the event of to fall.The processing of altitude signal is comprised change threshold (design parameter sees below) when confirming whether the height change scope is lain down or sat down over human normal with rate of change.

The acceleration of physical activity closes arrow And mould

Calculate by following two formulas respectively:

$\stackrel{\→}{\mathrm{SVM}}=\stackrel{\→}{a_x}+\stackrel{\→}{a_y}+\stackrel{\→}{a_z}$

$\left|\stackrel{\→}{\mathrm{SVM}}\right|=\sqrt{a_x^2+a_y^2+a_z^2}$

A wherein _x, a _y,, a _zRepresent respectively sensor three axle x, y, z to accekeration, wear under the pattern of the waistband of upright human body in fixed point, the z direction is vertical, x, y direction are corresponding to front and back and the left and right directions of human body.When arbitrarily wore the position, each was not axially direct corresponding with the human motion direction for accelerometer, by single-chip microcomputer process can determine random position lower device specifically towards.Can set and regulate for the wearer with different motion intensity

Secure threshold (parameter value aftermentioned), when

When surpassing setting threshold, can correctly judge to fall further combined with height change information whether to occur.

To the location with arbitrarily wear normal under pattern

The flow process that value is carried out the data analysis processing is slightly different, but wherein all comprises the processing of weighted mean and medium filtering.Surely wear under pattern in the location, gravity direction is initially corresponding Z-direction; Wear under pattern in random position, based on the unchangeability of acceleration of gravity size and Orientation, will be calculated as follows according to the data after low-pass filtering treatment, get the angle theta that the auto levelizer wearer closes arrow and gravity direction at different movable acceleration constantly.

$\mathrm{\θ}=\arccos (\frac{\stackrel{\→}{\mathrm{SVM}}}{\left|\stackrel{\→}{\mathrm{SVM}}\right|}\·\frac{\stackrel{\→}{g}}{\left|\stackrel{\→}{g}\right|})$ [be the dot product of 2 vectors in bracket.】

In formula,

Be the gravity acceleration,

For Mould; g _x, g _y, g _zBy respectively to a _x, a _y, a _zCarrying out low-pass filtering obtains.[described vector is all the vectors in three-dimensional system of coordinate take accelerometer as reference]

When After superthreshold, at the angle θ of superthreshold previous moment (being about 1 second, maximum less than 2 seconds) ₁With the angle θ that tends towards stability after superthreshold a period of time (common 1 ~ 5S) ₂Between angle variable quantity Δ (Δ=θ ₂-θ ₁) when surpassing the secure threshold of setting, be judged to be the wearer and probably occured to fall.

According to super in the process that may fall

The interior device height change data two correlation times that threshold value is forward and backward when height change surpasses setting threshold, can clearly be judged to have occured to fall on the basis of described angle variable quantity superthreshold.

Wear the location of device and the detection of random wearing mode realizes by the button of wearing of a particular design.Described to wear button be a kind of device holder that can be clipped on belt or underpants, on the position corresponding with the tongue tube of device in sensing module, small magnet (diameter is below 5 millimeters) arranged on holder, and device can be sensed this magnet after inserting and wearing button.This is worn button be worn on monitored human body, can the concrete wearing mode classification of implement device, the i.e. pattern of wearing of location and the wearing mode of non-location.Processing and control module can be worn situation according to two kinds and select respectively corresponding recognizer, and purpose is to improve accuracy data acquisition and the power management different with employing of monitoring.

Described acceleration closes arrow

Threshold value can be made as 1.5g ~ 2.0g; Described angle changes delta threshold value is made as 67 ° (approximately 90 ° 3/4ths); Described height change threshold value span is 40 ~ 90cm; Concrete height and acceleration rate threshold all can be regulated according to wearer's different heights.

Power module comprises: the chargeable lithium cell of (1) larger capacity and lithium cell charging manager, (2) be the directly little load capacity of the first via (5mA level) the feed regulator isolator I of power supply of single-chip microcomputer and sensing module, (3) are the second tunnel feed regulator isolator II than heavy load ability (50mA level) of bluetooth communication power supply.

the low-power consumption bluetooth that the is based on the CC2540 chip 4.0 technical communication module WB2540 that the bluetooth communication module adopts, two path analoging switch of controlling the power supply of tongue tube and bluetooth module are selected the ADG821 of nW level, accelerometer is selected the integrated sensor ADXL362(maximum operating currenbt 3 μ A with super low-power consumption, working current under the motion triggers pattern is 270nA, standby current is 10nA), the integrated sensor MS5611-01BA03(working current that the high precision barometric altimeter is selected super low-power consumption according to different resolution between 0.9 ~ 12.5 μ A, standby current is 0.14 μ A), that feed regulator isolator I selects is the voltage-reference device LT6656 with 5mA fan-out capability, feed regulator isolator II selects DC/DC voltage adjuster TPS62730, Charge Management core device is selected MAX1551, the wearing mode detecting device is selected the serial dried reed pipe of CT05 (selecting conducting resistance low (140m Ω) and working current can be arranged on several mA), the sensing of device and the operating voltage of the analog switch in processing and control module and power module are made as 2.5V, the bluetooth communication operating voltage is 2.1V.

Beneficial effect:

Human body fall monitoring device based on acceleration and elevation information of the present utility model comprises sensing, processing controls, communicates by letter, wears and detect and power module.Contain the sensing module of accelerometer, altitude gauge and be connected with processing and control module based on low-power scm, continue to monitor the acceleration of wearer's daily routines and detect height change, wear detection module testing fixture wearing mode; When judging that with altitude information the wearer falls according to the acceleration that gathers, processing and control module starts bluetooth communication, sends warning message (by mobile phone or other communication facilitiess transmission monitoring person or the monitor center with bluetooth); Power module is provided with the output of two kinds of different loads abilities, the large controlled supply communication module of person, little person's direct-furnish sensing and processing and control module; Can be placed in wearing of wearer's waistband and buckle and contain magnet, device can be checked oneself whether locate and wear.The acceleration information that the utility model has the advantages that to continue to monitor is accurately and timely found to fall in conjunction with elevation information; Reduce energy consumption with low power dissipation design and high energy efficiency management, reach long-term continuous firing requirement.

The utility model has the advantage of:

1. utilize the acceleration information that continues to monitor in conjunction with elevation information, can accurately and timely identify and fall and report to the police; When accelerometer detects the acceleration rate threshold signal of the super normal activity of device wearer, can wake immediately the single-chip microcomputer of dormancy up, start barometric altimeter by single-chip microcomputer and gather acceleration and altitude information; When single-chip microcomputer according to the three-dimensional acceleration change information that gathers calculate the disconnected wearer of device at short notice the acceleration of motion of (less than 2 seconds) human body generation superthreshold amplitude change and surpass the rotation of threshold angle, and height change also during superthreshold, judges that namely the wearer has occured to fall.

When single-chip microcomputer judges that according to the acceleration that gathers and altitude information the wearer falls, single-chip microcomputer starts bluetooth communication by power control switch and sends warning message, by mobile phone or other communication facilitiess with bluetooth of indoor and outdoor with bluetooth, warning message is transmitted monitoring person or monitor center.

2. adopt to coordinate the conceptual design of low energy consumption operation mode and the power management design of high energy efficiency significantly to reduce energy consumption with the device of low-power consumption continuous firing, reach the requirement that realizes long-time continuous firing under limited battery capacity.

Description of drawings

Fig. 1 is that the utility model is based on the human body fall monitoring device formation block diagram of acceleration and elevation information.

Fig. 2 is that the utility model is based on the human body fall monitoring apparatus structure functional schematic of acceleration and elevation information.

Fig. 3 is that the utility model is based on the human body fall monitoring device workflow diagram of acceleration and elevation information.

Fig. 4 is the implementation figure of Ben Peidai button judgment means position.(wherein scheme a for wearing buckle structure signal, the direction of arrow is for wearing the button direction of insertion, and figure b wears to smash the structural representation that inserts after monitoring modular, and scheming c is the side view of wearing button.）

Label declaration: 1-magnet, 2-snap part.

Embodiment

Below with reference to the drawings and specific embodiments, the utility model is described in further details:

Embodiment 1:

Described sensing module mainly has the integrated tri-axial acceleration meter of motion triggers arousal function and super low-power consumption by one and the integrated barometric altimeter of a slice low power consumption high-precision consists of.Wherein, directly by feed regulator isolator I power supply, barometric altimeter is provided by the single-chip processor i/o of processing controls the single-chip microcomputer of accelerometer and processing and control module, so its duty is determined by single-chip microcomputer.three axis accelerometer is in the very low motion triggers awakening mode of power consumption under normal circumstances, when monitored person's movement degree reach setting threshold value 1.2g ~ 1.4g(g is acceleration of gravity) time, wake accelerometer up and change FR mode of operation over to, produce simultaneously output signal and send to the single-chip microcomputer that is in dormancy as interrupt request, wake single-chip microcomputer work up by interrupt response, I/O mouth by single-chip microcomputer is that barometric altimeter Power supply and control analog switch is the power supply of wearing mode detecting device again, with gather synchronize with acceleration variation elevation information and check wearing mode., process according to the data of being undertaken by the different modes of wearing in conjunction with the height change information that obtains from barometric altimeter according to the continuous acceleration change information that gathers from sensing module, adopt the superthreshold method of discrimination can accurately judge the generation of falling.

Described power module contains the chip to the lithium cell charging management, and needs the two-way power supply of setting respectively by load capacity.Wherein, charging manager is selected the integrated device that can automatically identify USB or adapter, with the different charging modes of convenient use.The MAX1551 of Maxim company for example, it provides the charging current of maximum 100mA under the USB powering mode, the charging current of 280mA can be provided under mode adapter, and need not to prevent battery drain with input shielding diode.The specification of the two-way power supply that system arranges respectively is respectively 2.5V/5mA(feed regulator isolator I) and 2.3V/100mA(feed regulator isolator II).Wherein power supply I adopts tandem voltage reference source device (for example LT6656BIS6-2.5) to provide, as power supply not only output voltage stabilization and himself power consumption little (maximum static current is less than 1 μ A), can satisfy the power demands of other module devices except bluetooth communication with voltage-reference.In device, the power consumption of bluetooth communication is relatively large, its working current is more than 20mA, therefore, bluetooth communication adopts the Power supply of design separately, select integrated power supply adjuster (for example TPS62733) to realize power supply, by the supply current of single-chip processor i/o control simulation switch I I gating and cut-out bluetooth communication.

The identification of wearing mode by a tongue tube with wear the permanent magnet of buckling and coordinate realization.The two ends end of tongue tube is connected on respectively on the output terminal of I/O mouth of MSP430 single-chip microcomputer and analog switch, and at that end that connects the single-chip processor i/o mouth also by pull down resistor ground connection; Another termination power I output terminal of analog switch.Concrete detection and power save mode system of selection are to export a high level by an I/O mouth of single-chip microcomputer to make the analog switch conducting, thereby an end of tongue tube obtains power supply, then whether single-chip microcomputer to the sampling of the level state of the other end (end of connecting resistance) of tongue tube, adopts fixed point mode to wear by the I/O mouth level height judgment means to the end that connects the tongue tube connecting resistance by the I/O mouth.

As the processing and control module core single-chip microcomputer select the microcontroller MSP430F5510 with super low-power consumption and wide operating voltage range of TI company, it is under the 3V power supply, take the current drain of 1MHz work as 195 μ A, current drain under the low-power consumption mode (i.e. the LPM3 mode of operation of this series monolithic) of opening, can waking up fast at real-time clock is 2.1 μ A(3V power supplys), its I/O mouth has mA level driving force.in this device, when the device wearer is in than low-intensity (during the motion of the acceleration of accelerometer impression＜1.2g), it is 2.5V that this single-chip microcomputer is in low-power consumption energy saver mode LPM3(operating voltage substantially), under the acceleration of motion excitation that occurs by a relatively large margin, the output signal that this single-chip microcomputer is produced by accelerometer is waken up and is changed mode of operation over to, receive accelerometer and the output of altitude gauge and the conducting state information that tongue tube is obtained in inquiry by the SPI communication interface respectively, process with threshold decision by data and determine whether the wearer falls, if judge the event of falling, connect the power supply of wireless module by analog switch, start bluetooth module and send warning message, by with the mobile phone of blue tooth interface or the communication facilities with bluetooth of indoor and outdoor, this warning message being transmitted monitoring person or monitor center, if judge without the event of falling to occur, single-chip microcomputer will change low-power consumption mode once again over to.

The accelerometer that 3-axis acceleration sensor in sensing module is selected is the integrated tri-axial acceleration meter ADXL362 with super low-power consumption and motion triggers arousal function, it wakes working current 270nA only under mode of operation up in motion triggers, electric current is lower than 3 μ A when the gamut output data rate is 400Hz, and operating voltage can be hanged down and be reached 1.8V.Barometric altimeter is to have low-power consumption and high-precision integrated device MS5611-01BA03, and its height change scope that can differentiate has reached 10cm, and the power consumption under normal mode of operation only has 1 μ A, is suitable for directly powering with the single-chip processor i/o mouth.What the wearing mode detecting device adopted is the serial dried reed pipe of CT05, and its internal resistance is very low, and the conducting working time is short, thereby energy consumption is very little.In the power module design, the selection emphasis of feed regulator isolator has been considered work efficiency under low load, wherein feed regulator isolator I does not adopt general Power Management Devices, be 2.5V but selected according to the low consumption level of the devices such as sensor, single-chip microcomputer the voltage-reference LT6656(output voltage that only has 1 μ A static state to consume, output current reaches 5mA), when obtaining stabilized supply voltage, reduced consuming from god of Power Management Devices.Bluetooth communication adopts the wireless communication module WB2540 based on the CC2540 low-power chip that supports bluetooth 4.0 communication standards, having adopted the TPS62733(output voltage for the feed regulator isolator 2 of its power supply is 2.3V, maximum current can reach 100mA), and the power supply of TPS62733 is controlled by analog switch II by single-chip microcomputer, to reduce to greatest extent the autophage of bluetooth communication and its power supply.The motion perception Trigger Function that has extremely low power dissipation due to key sensor spare, and selected device power consumption is all low, add the working method design of having adopted main power consumption module (single-chip microcomputer, bluetooth module) to need wake-up, therefore, the energy consumption of this device is very low, and (the average working current that continues to survey is about 50 μ A, 45 ~ 61 μ A, average power consumption is below 150 μ W), when can monitoring requirement of real time with persistent movement, significantly reduce the energy consumption of this device, greatly strengthened its flying power.Wear to buckle to be provided with for wearing and detain the clip that is fixed on the objects such as monitored person's belt.

The formation block diagram based on the human body fall monitoring device of acceleration and elevation information as shown in Figure 1, it mainly comprises sensing module, processing and control module, communication module and power module.processing and control module based on super low power consuming single chip processor is the core of device, other modules are connected with processing and control module and controlled by it, sensing module comprises the wearing mode detecting device, altitude gauge, accelerometer, can gather by the acceleration information in device wearer daily routines, height change information and testing fixture wearing mode, the effect that checks wearing mode is that device is placed in and wears when smashing this fixed point wearing mode, the orientation of device is fixed, the acceleration change of its three change in coordinate axis direction can reflect obviously that the pose of wearer's body changes, more be conducive to the generation of falling with simple and the accurate detection of low-power consumption mode.

The apparatus structure of sustainable human body fall monitoring as shown in Figure 2 and power management block diagram.In figure, solid line represents power lead, with the line representation signal line of arrow.The power supply of this device is from rechargeable lithium battary, and battery capacity is selected 1000mAh, is designed with charge management circuit, can realize two kinds of charging modes of power supply adaptor and USB, and during charging, charging management chip can provide power supply for system.The output terminal of charging management chip is received battery, also receives the power supply input pin of power supply chip simultaneously.This device has designed the two-way power supply, i.e. power supply I and power supply II.Power supply I is responsible for to processing and control module and sensing module power supply, and power supply 2 is the bluetooth communication power supply under the Single-chip Controlling of processing and control module.Wherein the concrete power supply of sensing module and management design scheme are: the power supply of accelerometer is directly provided by power supply I, in module, the power supply of altitude gauge is provided by the I/O mouth of single-chip microcomputer MSP430F5510, and the power supply of wearing mode detecting device is by controlled by monolithic processor controlled analog switch.The sensing module of device detects human motion, selected accelerometer has the Threshold function, therefore, by being set, a rational acceleration rate threshold carries out next step operation, this acceleration activation threshold value that starts single-chip microcomputer work can be arranged on [g is acceleration of gravity] between 1.2g ~ 1.4g, specifically according to monitored people's situation settings such as daily exercise custom.The low-power scm of device is under the down trigger park mode under normal circumstances, and not to the altitude gauge power supply, has also disconnected the power supply of wearing detecting sensor and bluetooth communication.When accelerometer triggered because the acceleration intensity of responding to surpasses activation threshold value, accelerometer entered normal operating conditions, and look-at-me of output, wake the single-chip microcomputer that is in the low-power consumption park mode up when acceleration is sampled.Single-chip microcomputer first provides the altitude gauge power supply by the I/O mouth, next checks the time of real-time clock, the judgement current time belongs to which (period can be set to two kinds of daytime and evenings) period, then the control simulation switch is the power supply of wearing mode detecting device, by after checking its output state judgement wearing mode, (fixed point mode or the arbitrarily difference of mode arbitrarily refer to will not install orientation and be placed on to wear and smash.Like this, need to be according in the certain hour interval, front and back acceleration and height change constantly distinguished and judged whether to fall, and such information processing is more complicated.), then its disconnection power supply of control simulation switch.System begins to gather acceleration and elevation information under Single-chip Controlling afterwards, according to different periods and wearing mode, carries out data by distinct program and processes, the decision maker wearer event of whether falling.Processing judgement according to the different situations of period and wearing mode can improve the accuracy of monitoring and facilitate power consumption control under different situations.

Being illustrated in figure 3 as the fall data of device of sustainable monitoring human processes and the judgement workflow diagram of falling.Under normal circumstances, after system powers on and completes initialization, enter work, the dormancy alternate cycles state of a low duty ratio.

Be illustrated in figure 4 as outward appearance and the structural representation of wearing button and device, mainly show the structure building form of realizing fixed point wearing position self-checking function.

Device fixed point wearing mode detecting device is made of in conjunction with single-chip processor i/o mouth and analog switch etc. the tongue tube of magnetosensitive, utilizes the excitation of wearing the small magnet of settling on the button ad-hoc location to make the closed conducting of tongue tube, thereby obtains the information that fixed point is worn.

The concrete connected mode of installing each module is as follows.

In processing and control module, the battery charging state indication pin POK that is responsible for the MAX1551 of Charge Management in the I/O mouth p1_5 of MSP430F5510 and power module is connected, to detect the charge condition of battery when the charging; The I/O mouth p1_6 of MSP430F5510 connects the A channel of analog switch II(ADG821 in power module) pin IN1, with by feed regulator isolator II(TPS62730 in the control power module) input control the power supply of bluetooth module.

In sensing module, interrupt output mouth INT1(the 11st pin of accelerometer ADXL362) connect the I/O mouth p1_3 that MSP430f5510 has interrupt function, to produce look-at-me by accelerometer when surpassing the general motion activation threshold value, wake the single-chip microcomputer MSP430f5510 that generally is in dormant state up; The I/O mouth p1_4 of MSP430f5510 connects the 9th pin (INT2) of accelerometer ADXL362, to receive the synchronized sampling order from MSP430f5510; The SPI communication port USCIA0 of MSP430f5510 is connected the SPI port and is connected and (to be specially the UCA0CLK in USCIA0 with accelerometer ADXL362, UCA0CSTE, UCA0MISO, UCA0MOSI respectively with the SPI mouth of accelerometer ADXL in clock signal terminal CLK, sheet choosing end CS and input/output port MOSI, MISO connects), realize data communication between the two.In processing module, the I/O mouth p1_0 of MSP430f5510 is connected to the power positive end (the 7th pin) of altitude gauge MS5611-01BA03 in sensing module, realizes by power supply and the control of processor I/O mouth to altitude gauge; The SPI interface USCIB1 of MSP430f5510 is connected the SPI interface and is connected (being specially UCB1CLK, the UCB1CSTE of processor, SCLK, CSB, SDO, the SDI pin that UCB1MISO, UCB1MOSI connect respectively altitude gauge MS5611-01BA03) with altitude gauge MS5611-01BA03, realize the data communication between processor and altitude gauge.

In wearing detection module, the B passage of analog switch I(ADG821) a termination power, another termination tongue tube; The I/O mouth p1_2 of MSP430f5510 connects the IN2 end of ADG821, realizes that processing and control module is to wearing the power supply control of testing circuit module; The I/O mouth p1_1 of MSP430f5510 connects the end that tongue tube CT05 is connected with stake resistance, wears condition information to obtain the location.

The P6 group I/O mouth of MSP430f5510 in processing and control module connects the P0 group I/O mouth of bluetooth communication Connection Block WB2540-connecter, realize the communication between processor and bluetooth module, the I/O mouth p1_7 of MSP430f5510 is connected to the reset pin N_RESET of Bluetooth chip by Connection Block WB2540-connecter, realize enabling on demand the function control of bluetooth communication.

The energy consumption level of this device and flying power situation are as follows.

The mode of operation of this device is divided into three kinds:

(1) only there is accelerometer to work in the general monitoring pattern of motion triggers pattern;

(2) the emphasis monitoring pattern of accelerometer, altitude gauge, single-chip microcomputer normal operation;

(3) the warning message sending mode of accelerometer, altitude gauge, single-chip microcomputer and bluetooth module and the work of supply module power.Wherein, wearing detection module only uses once when the emphasis monitoring pattern is enabled.

Under general detecting pattern, the current sinking of accelerometer ADXL362 is 270nA, and ADG821 consumes 18nA altogether, and the MSP430 single-chip microcomputer consumes 180nA, amounts to 468nA;

Under focus detection mode, the current sinking of accelerometer ADXL362 is 3.0 μ A, and altitude gauge MS5611 consumes 1 μ A, wears detection module (work once) 5 μ A, and the MSP430 single-chip microcomputer consumes 195 μ A, amounts to 204 μ A;

Under the information sending mode, the current sinking of accelerometer ADXL362 is 3.0 μ A, and altitude gauge MS5611 consumes 1 μ A, and the MSP430 single-chip microcomputer consumes 195 μ A, and bluetooth communication consumes 24mA, amounts to 24.2mA.

Generally, the violent run duration of one day average relative of people 2.5 hours by 4.5 hours between, in addition people every day usually sleep compared compared with normal between 6 ~ 12 hours.Therefore, the general monitoring pattern of this device shared time scale in a day is about 82 ~ 90% times, specifically varies with each individual.If when falling, institute's experience process maximum accounts for 1 ‰ (actual in this number) of a time, therefore can be calculated the average power consumption of system under two kinds of limiting cases.Battery at 1000mAh guarantees that all the time at least 10% energy is used under the condition of wireless transmission simultaneously, and the active volume of battery is 900mAh.The below is based on the power consumption of above-mentioned analysis condition and data and installs when continuing a journey and calculate.Wherein, the frequency of operation of MSP430F single-chip microcomputer is 1MHz.

Level of current drain based on above-mentioned working time setting and three kinds of mode of operations of this device can get average current consumption and cruising time under different situations:

General monitoring pattern accounts in the situation of 90% time:

Average consumed cur-rent: P=p1*90%+p2*10%+p3*1 ‰=0.4212+20.4+24.2=45 (μ A)

But battery cruising time: T1=900/0.045/24=833.3(day)

General monitoring pattern only accounts in the situation of 60% time:

Average consumed cur-rent: P=p1*82%+p2*18%+p3*1 ‰=0.38376+36.72+24.2=61.3 (μ A)

But battery cruising time: T1=900/0.0613/24=611.8(day).

Claims (4)

1. human body fall monitoring device based on acceleration and elevation information, it is characterized in that, comprise the monitoring modular that is integrated with altitude gauge, accelerometer, communication module and single-chip microcomputer, described altitude gauge and accelerometer all are connected with single-chip microcomputer by the SPI communication port, and communication module is connected with single-chip microcomputer.

2. the human body fall monitoring device based on acceleration and elevation information according to claim 1, is characterized in that, also comprises the wearing mode checking module; The wearing mode checking module comprises tongue tube and the pull down resistor of detaining and being integrated in described monitoring modular of wearing with magnet for the described monitoring modular of plug-in mounting; Described tongue tube and pull down resistor are connected between the output terminal and ground of the first analog switch that input end is connected with positive source, the power supply of the branch road that tongue tube connects with pull down resistor is controlled by the first analog switch that is controlled by single-chip microcomputer, and the tie point of tongue tube and pull down resistor connects an input port of single-chip microcomputer.

3. the human body fall monitoring device based on acceleration and elevation information according to claim 1 and 2, it is characterized in that, described accelerometer adopts the integrated tri-axial acceleration meter ADXL362 with motion triggers arousal function, described height is counted integrated high precision barometric altimeter MS5611, tongue tube is the serial dried reed pipe of CT05, single-chip microcomputer is MSP430F5510, and communication module is for supporting the wireless communication module WB2540 of bluetooth 4.0 communication standards.

4. the human body fall monitoring device based on acceleration and elevation information according to claim 3, it is characterized in that, the power module of powering for described monitoring modular comprises a Charge Management interface and two-way power supply, wherein, first via power supply is the communication module power supply, the the second road power supply is single-chip microcomputer, wearing mode checking module and accelerometer power supply, is serially connected with the second analog switch that is controlled by single-chip microcomputer in the path of first via power supply.

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