TWI797776B - Fall detector of radar technology - Google Patents

Abstract

A fall detector of radar technology includes a target movement sensing unit and a microwave radar module for sensing the relative movement speed between a detected target and the microwave radar module and generating an analog signal the output frequency; a target mobile signal processing unit is electrically connected to a first adjustable gain amplifier, a second adjustable gain amplifier, a voltage comparator, a frequency/voltage converter, and a voltage follower the target mobile signal processing unit is composed of a non-inverting amplifier. The target mobile signal processing unit performs coupling, amplifying, waveform shaping and frequency/voltage conversion on the output frequency signal of the microwave radar module in sequence, and then the non-inverting amplifier outputs the passive signal. Detect the DC voltage of the target; a target movement judgment unit is composed of a single-chip module electrically connected to an electronic clock timing module and a display module. The single-chip module is used to continuously sample the DC voltage and compare The relative movement between the microwave radar module and the detected target determines whether the detected target has an accidental fall and sends out a distress signal. The electronic clock timing module uses a 24-hour system for timing, and the display module is for reading Taking the electronic clock timing module, and then displaying the time value of hour, minute and second, the present invention is a non-wearable type that can determine whether the detected target has a fall accident, and sends out a distress signal.

Description

Fall detector based on radar technology

The present invention relates to a fall detector, in particular to a fall detector based on radar technology.

By the way, falls are the most common accidental injury in the elderly population. About one-third to half of the elderly population has experienced falls. For the elderly, falling is an accident that can cause trauma and disability. Therefore, the elderly who have experienced falls will be afraid of falling again, resulting in reduced mobility, increased dependence, and even death;

Among the surveyed elderly people, the average person falls about 1.4 times a year, and the incidence rate of falls is 15.5%. Among them, the incidence rate of falls was 12.5% for males and 17.5% for females. From the point of view of the place where the falls occurred, 62% of the elderly’s falls most often occurred in the community, public places, bedrooms and toilets at home, and these are the places with the highest probability of falls for the elderly;

The current design of smart watches or other commonly used fall detectors is a "wearable" target fall detection method. The detected target must wear the device of the fall detector on the detected target, so as to In the event of a fall accident on the detected target, it can be used to detect the accident in a timely manner. However, the above-mentioned commonly used devices are all outside the body. Some people will reduce the number of times they wear them because they are afraid of trouble. In this way, no matter how good the sensing protection is The equipment was also to no avail.

Therefore, in view of the problems described in the above-mentioned conventional knowledge, the inventor of this case invested a lot of time in researching relevant knowledge, researching and developing related products, and also considered the prevention strategy of falls with multiple intervention models, in addition to strengthening prevention in advance , When falling down, by establishing a fast and accurate detection and timely notification of the emergency mechanism, it is the goal that can be further worked hard to meet the needs of the public.

The main purpose of the present invention is to provide a non-contact, non-wearable fall detector. The detected object does not need to carry any accessories at all, that is, it can perform fall detection work on the detected object and alarm for the occurrence of a fall event.

In order to achieve the above object, the present invention provides a fall detector based on radar technology, including: a target movement sensing unit with a microwave radar module for sensing the distance between a detected target and the microwave radar module relative moving speed, and generate an output frequency of an analog signal; a target moving signal processing unit is electrically connected to a first adjustable gain amplifier, a second adjustable gain amplifier, and a voltage comparator by a voltage follower Composed of a frequency/voltage converter and a non-inverting amplifier, the target mobile signal processing unit sequentially performs coupling, amplification, waveform shaping and frequency/voltage conversion on the output frequency signal of the microwave radar module, Then the non-inverting amplifier outputs the DC voltage of the detected target; a target movement judgment unit is composed of a single chip module electrically connected to an electronic clock timing module and a display module, the single chip module It is used to continuously sample the DC voltage, compare the relative movement between the microwave radar module and the detected target, and then judge whether the detected target has a fall accident, and send a distress signal. The electronic clock timing module is 24 hours Timekeeping, the display module reads the electronic clock timing module, and then displays the time value of hours, minutes and seconds;

In some embodiments, the voltage comparator shapes the waveform of the output frequency into a square wave. When the relative moving speed between the detected target and the microwave radar module is faster, the square wave of the target moving signal processing unit The higher the frequency, the higher the output voltage of the frequency/voltage converter. When the output voltage is greater than the preset critical value, the single-chip module judges that the detected target may have a fall accident. The slower the relative moving speed between the target and the microwave radar module, the lower the square wave frequency of the target moving signal processing unit, and the lower the output voltage of the frequency/voltage converter. When the output voltage does not exceed the preset The critical value of the single-chip module determines that there is no accidental fall of the detected target.

In some embodiments, when the single-chip module determines that the detected object may fall, it starts the countdown of the preset timer in the single-chip module.

In some embodiments, the single-chip module further includes a status reset switch electrically connected to reset the timer in the single-chip module to a default value.

In some embodiments, the target movement judging unit further includes a bluetooth wireless module electrically connected to a mobile device, and the single chip module can pass through the bluetooth wireless module Send distress signals such as text, picture or sound to the mobile device.

In some embodiments, the target movement judging unit further includes an alarm module, which can receive a signal from the single-chip module and send out warning signals such as light, sound or vibration.

In some embodiments, the target movement sensing unit further includes a restricting device. The restricting device extends upwards from a bottom periphery to a ring wall, and the ring wall extends upwards to an opening. The microwave radar module can It is arranged on the bottom so that the microwave signal of the microwave radar module is emitted towards the direction of the opening, wherein the bottom and the ring wall are made of metal.

Please refer to the first figure to the fourth figure, a fall detector based on radar technology of the present invention, including a target movement sensing unit 10, a target movement signal processing unit 20 and a target movement judging unit 30, wherein:

The target movement sensing unit 10 has a microwave radar module 11 for sensing the relative moving speed between a detected target and the microwave radar module 11, and generates an output frequency of an analog signal;

The target mobile signal processing unit 20 is electrically connected to a first adjustable gain amplifier 22, a second adjustable gain amplifier 23, a voltage comparator 24, and a frequency/voltage converter 25 by a voltage follower 21. Composed of a non-inverting amplifier 26, the target mobile signal processing unit 20 performs coupling, amplification, waveform shaping and frequency/voltage conversion on the output frequency signal of the microwave radar module 11 in sequence, and then the non-inverting Amplifier 26 outputs the DC voltage of the detected target; wherein the first adjustable gain amplifier 22 and the second adjustable gain amplifier 23 are mainly designed to be adjustable in the amplification gain of the output signal of the microwave radar module 11, so Design, that is, the amplification gain of the output signal of the microwave radar module 11 can be adjusted in different application occasions to meet the requirements of different sensing distances.

The target movement judging unit 30 is composed of a single-chip module 31 electrically connected to an electronic clock timing module 32 and a display module 33. The single-chip module 31 is used for continuously sampling the DC voltage and comparing the The relative movement between the microwave radar module 11 and the detected target, and then judge whether the detected target has a fall accident, and send a distress signal. The electronic clock timing module 32 is a 24-hour clock, and the display module 33 For reading this electronic clock timing module 32, and then display the time value of hour, minute and second.

The voltage comparator 24 shapes the waveform of the output frequency into a square wave. When the relative moving speed between the detected target and the microwave radar module 11 is faster, the frequency of the square wave of the target moving signal processing unit 20 is higher. , the output voltage of the frequency/voltage converter 25 is also higher. When the output voltage is greater than the preset critical value, the single-chip module 31 judges that the detected object may have a fall accident. When the detected object and The slower the relative moving speed between the microwave radar modules 11, the lower the square wave frequency of the target mobile signal processing unit 20, and the lower the output voltage of the frequency/voltage converter 25, when the output voltage does not exceed the preset The threshold value is set, and the single-chip module 31 judges that there is no fall accident in the detected target.

When the single-chip module 31 judges that the detected object may have a fall accident, it starts the timer in the single-chip module 31 to count down to the preset value, wherein the single-chip module 31 further includes an electrical connection The status reset switch SW is used to reset the timer in the single chip module 31 to return to a preset value.

The target movement judging unit 30 further includes a Bluetooth wireless module 40 electrically connected to a mobile device 90, and the single-chip module 31 can transmit data through the Bluetooth wireless module 40. SOS messages such as text, picture or sound are sent to the mobile device 90 .

The target movement judging unit 30 further includes an alarm module 50, which can receive the signal from the single-chip module 31 and send out warning signals such as light, sound or vibration.

Please refer to the fifth figure to the sixth figure, the target movement sensing unit 10 further includes a restricting device 60, the restricting device 60 extends upwards from the periphery of a bottom 61 to a ring wall 62, and the ring wall 62 extends upwards An opening 63, the microwave radar module 11 can be arranged on the bottom 61, so that the microwave signal of the microwave radar module 11 is emitted towards the direction of the opening 63, wherein the bottom 61 and the ring wall 62 are made of metal, and the As a shielding effect, the microwave signal is directional and emitted toward the opening 63 , wherein the limiting device 60 can be adjusted to a cylindrical opening shape or a fan-shaped opening shape according to the setting environment.

The structure of the present invention has been described above, and the implementation operation state of the present invention is described next;

Please refer to the first figure to the fourth figure, when the detected target moves fast and approaches the microwave radar module 11, the output frequency of the microwave radar module 11 will also increase relatively quickly, and the frequency in the target mobile signal processing unit 20 After processing by the /voltage converter 25 and the non-inverting amplifier 26, output a DC voltage Vf that changes in direct proportion to the moving speed of the target detected by the microwave radar module 11. After the group 31 compares and judges, if the output voltage is greater than the preset critical value, the digital output RC2 pin of the single-chip module 31 will change from a low-voltage logic level to a high-voltage logic level. At the same time, the single-chip module 31 The timer inside is also enabled and starts counting for one minute;

If the body of the detected target feels that there is no serious hindrance and the consciousness returns to normal within one minute, the state reset switch SW can be pressed to command RC2 to output a low-voltage logic level, and the single-chip module 31 returns to the initial state. working status;

If the detected target still fails to press the state reset switch SW in time after the one-minute time of the single-chip module 31 expires, so as to clear the output state of the RC2 pin, the single-chip module 31 will be connected in series through itself. Port and bluetooth wireless module, send distress signals such as text, picture or sound to this mobile device 90, send distress messages to relatives and friends outdoors.

Therefore, the fall detector based on radar technology of the present invention can accurately detect a fall event and issue an alarm without wearing any sensor. Advantages of wearing.

The above disclosures are only preferred embodiments provided by the present invention, and are not intended to limit the scope of the present invention. All equivalent changes made by those skilled in the art according to the present invention shall fall within the scope of the present invention. range covered.

10: Target movement sensing unit 11:Microwave radar module 20: Target mobile signal processing unit 21: Voltage follower 22: The first adjustable gain amplifier 23: The second adjustable gain amplifier 24: Voltage comparator 25: Frequency/Voltage Converter 26: Non-inverting amplifier 30: target movement judgment unit 31:Single chip module 32: Electronic clock timing module 33:Display module SW: Status reset switch 40:Bluetooth wireless module 50:Alarm module 60: Limiting device 61: bottom 62: ring wall 63: opening 90:Mobile device

The first figure is a system block diagram of the fall detector based on radar technology of the present invention. The second figure is a block diagram of the target movement judging unit system of the fall detector based on radar technology of the present invention. The third figure and the fourth figure are the circuit diagrams of the fall detector based on the radar technology of the present invention. The fifth figure is a diagram of the cylinder opening of the restricting device of the fall detector based on the radar technology of the present invention. Figure 6 is a fan-shaped opening diagram of the limiting device of the fall detector based on radar technology of the present invention.

10: Target movement sensing unit

11:Microwave radar module

20: Target mobile signal processing unit

21: Voltage follower

22: The first adjustable gain amplifier

23: The second adjustable gain amplifier

24: Voltage comparator

25: Frequency/Voltage Converter

26: Non-inverting amplifier

30: target movement judgment unit

Claims (7)

A fall detector based on radar technology, including: a target movement sensing unit with a microwave radar module, used to sense the relative moving speed between a detected target and the microwave radar module, and generate a The output frequency of the analog signal; a target mobile signal processing unit, which is electrically connected to a first adjustable gain amplifier, a second adjustable gain amplifier, a voltage comparator, and a frequency/voltage converter by a voltage follower Composed of a non-inverting amplifier, the target mobile signal processing unit performs coupling, amplification, waveform shaping and frequency/voltage conversion on the output frequency signal of the microwave radar module in sequence, and then the non-inverting amplifier outputs the The DC voltage of the detected target; a target movement judgment unit is composed of a single-chip module electrically connected to an electronic clock timing module and a display module, and the single-chip module is used for continuously sampling the DC voltage, Compare the DC voltage change between the microwave radar module and the detected target, and then judge whether the detected target has a fall accident, and send a distress signal. The electronic clock timing module is a 24-hour clock, and the display module In order to read the timing module of the electronic clock, and then display the time values of hours, minutes and seconds. The fall detector based on radar technology as described in Claim 1, wherein the voltage comparator shapes the waveform of the output frequency into a square wave, when the relative moving speed between the detected target and the microwave radar module is faster , the higher the frequency of the square wave of the target mobile signal processing unit, the higher the output voltage of the frequency/voltage converter. When the DC voltage is greater than the preset critical value, the single-chip module judges that it has been detected The target may fall accidentally. When the relative moving speed between the detected target and the microwave radar module is slower, the square wave frequency of the target moving signal processing unit will be lower, and the output voltage of the frequency/voltage converter will be lower. When the output voltage does not exceed the preset critical value, the single-chip module judges that the detected object has no fall accident. The fall detector based on radar technology as described in claim 1, wherein when the single-chip module judges that the detected target may have a fall accident, it starts the timer in the single-chip module to count down the preset value timing. The fall detector based on radar technology as described in claim 3, wherein the single-chip module further includes a state reset switch electrically connected to reset the timer in the single-chip module to return to the preset set value. The fall detector based on radar technology as described in Claim 1, wherein the target movement judging unit further includes a Bluetooth wireless module electrically connected, the Bluetooth wireless module is wirelessly connected to a mobile device, and the single chip The module can send distress signals such as text, picture or sound to the mobile device through the Bluetooth wireless module. The fall detector based on radar technology as described in claim 1, wherein the target movement judging unit further includes an alarm module, which can receive the signal of the single chip module and emit light, sound or vibration Wait for warning signs. The fall detector based on radar technology as described in Claim 1, wherein the target movement sensing unit further includes a restricting device, the restricting device is a ring wall extending upwards from a bottom periphery, and the ring wall extends upwards There is an opening, and the microwave radar module can be arranged on the bottom, so that the microwave signal of the microwave radar module is emitted towards the opening, wherein the bottom and the ring wall are made of metal.

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