CN210428742U - Window alarm device based on environment backscatter - Google Patents

Window alarm device based on environment backscatter Download PDF

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CN210428742U
CN210428742U CN201921903747.2U CN201921903747U CN210428742U CN 210428742 U CN210428742 U CN 210428742U CN 201921903747 U CN201921903747 U CN 201921903747U CN 210428742 U CN210428742 U CN 210428742U
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unit
transmitter
receiver
backscatter
directional beam
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赵培焱
王衍文
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Xijing University
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Xijing University
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Abstract

The utility model discloses a window alarm device based on environment backscatter, including environment backscatter transmitter and environment backscatter receiver, environment backscatter transmitter include transmitter energy collection unit, the control unit and directional beam transmitting element, transmitter energy collection unit be connected with the control unit and directional beam transmitting element respectively, the control unit be connected with directional beam transmitting element; the environment backscatter receiver comprises a receiver energy collection unit, a signal detection unit and an alarm unit, wherein the receiver energy collection unit is respectively connected with the signal detection unit and the alarm unit, and the signal detection unit is connected with the alarm unit. The device is simple and convenient, can work stably under the condition that does not need external power supply, has remedied the circumstances that need rely on power drive such as having a power failure, battery power is not enough, and then has improved the reliability of equipment.

Description

Window alarm device based on environment backscatter
Technical Field
The invention relates to a window alarm device, in particular to a window alarm device based on environmental backscattering.
Background
Along with the improvement of living standard of people, the public concern about safety problems is increasing day by day, and alarm devices based on different principles are also endless. At present, most common window alarm devices on the market are infrared correlation alarm detectors or electromechanical detectors, the infrared correlation alarm detectors are composed of a pair of signal transmitters and signal receivers, when infrared signals between the transmitters and the receivers are blocked, alarm information can be sent out, but the infrared correlation alarm detectors need to be powered constantly, the infrared correlation alarm detectors are easy to age and short in service life, and the infrared correlation alarm detectors are complex to maintain. The metal strip detector is used as the most common electromechanical detector, a metal strip is arranged on a door and a window to form a detection circuit, when an intruder breaks the detection circuit or damages a metal foil, an alarm device can be triggered, and the electromechanical detector also needs to provide a power supply all the time, so that the metal strip detector is easy to age and short in service life.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a window alarm device based on environment backscattering, which adopts a window alarm device based on environment backscattering technology, can stably work without an external power supply through wireless radio frequency signals in the surrounding environment, makes up the conditions of power failure, insufficient battery power and the like which need to be driven by the power supply, and further improves the reliability of equipment.
In order to achieve the technical purpose, the invention is specifically realized by the following technical scheme:
a window alarm device based on environment backscattering comprises an environment backscattering emitter and an environment backscattering receiver, wherein the environment backscattering emitter comprises an emitter energy collecting unit, a control unit and a directional beam emitting unit, the emitter energy collecting unit is respectively connected with the control unit and the directional beam emitting unit, and the control unit is connected with the directional beam emitting unit; the environment backscatter receiver comprises a receiver energy collection unit, a signal detection unit and an alarm unit, wherein the receiver energy collection unit is respectively connected with the signal detection unit and the alarm unit, and the signal detection unit is connected with the alarm unit.
The transmitter energy collection unit and the receiver energy collection unit convert received radio frequency signals emitted by a radio frequency source around the environment into electric energy in an environment backscattering mode. The rf source includes, but is not limited to, a base station, a tv tower, etc. around the environment, and the rf source is not limited to one, and there may be a plurality of rf sources.
The control unit presets an id identifier of the environment backscatter transmitter, the directional beam transmitting unit transmits the id identifier output by the control unit in a directional beam mode, and the directional beam points to the environment backscatter receiver.
The signal detection unit is used for detecting an id signal sent by the environment backscatter transmitter. When the id signal is detected, no intrusion behavior is shown, and the alarm unit is not triggered to work; when the id signal is not detected, the fact that an intruder triggers the intrusion behavior is indicated, the alarm unit is triggered to work, an alarm prompt tone is sent out immediately, the user is reminded that the intruder enters, and therefore the effects of early warning and frightening the intruder for the user are achieved.
The invention has the beneficial effects that:
the invention improves the reliability of the equipment by collecting the radio frequency signals emitted by the radio frequency source in the surrounding environment, makes up the conditions of power failure, insufficient battery power and the like which need to be driven by a power supply, and gets rid of the dependence on the power supply. Compared with an infrared correlation alarm detector or an electromechanical detector and the like which need a power supply or a battery, the window alarm device based on the environmental backscattering avoids the tedious labor input of power supply or battery replacement and the like. The transmitter adopts directional beams, so that the beams have directivity, and the coverage distance and the accuracy are increased.
Drawings
FIG. 1 is a schematic view of the installation structure of the window alarm device of the present invention;
FIG. 2 is a control block diagram of a window alarm apparatus of the present invention;
FIG. 3 is a schematic diagram of an energy harvesting unit of the transmitter of the window alarm device of the present invention;
FIG. 4 is a schematic diagram of a power supply control and directional beam transmitting unit of the window alarm device of the present invention;
FIG. 5 is a schematic diagram of a window alarm receiver energy harvesting unit of the present invention;
FIG. 6 is a schematic diagram of a signal detection unit and an alarm unit of the window alarm device of the present invention;
in the figure: 100. the system comprises an environmental backscatter transmitter 101, a transmitter energy collection unit 102, a control unit 103, a directional beam transmitting unit 200, an environmental backscatter receiver 201, a receiver energy collection unit 202, a signal detection unit 203 and an alarm unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a window alarm device based on environmental backscattering includes:
two groups of emission rods T arranged on four boundaries of the rectangular window1、T2And a receiving rod R1、R2At the launching rod T1Upper mounting emitter T11、T12At the launching rod T2Upper mounting emitter T21、T22At the receiving rod R1Upper mount receiver R11、R12At the receiving rod R2Upper mount receiver R21、R22. Emitter T11、T22、T21、T22To the receiver R11、R12、R21、R22The azimuth transmits a directional radio frequency beam. Emitter T11、T22、T21、T22And a receiver R11、R12、R21、R22The devices are devices without power supply, and the devices adopt an environment backscattering mode to obtain radio frequency signals emitted by radio frequency sources RFs and convert the radio frequency signals into electric energy. The radio frequency source RFs may be a base station, a tv tower, etc. surrounding the environment.
The rf source is not limited to one, there may be a plurality of rf sources,only the transmitter and the receiver are required to be capable of receiving the signal transmitted by the radio frequency source; firing rod T1、T2The upper is not limited to four transmitters, receiving rods R1、R2Nor is it limited to four receivers. A plurality of transmitters can be arranged on the transmitting rod, and a plurality of receivers can be arranged on the receiving rod; it is also possible to mount a plurality of transmitters on the transmitting rod and a receiver on the receiving rod. A transmitter can also be arranged on the transmitting railing, and a plurality of receivers are arranged on the receiving railing.
As shown in fig. 2, a window alarm device based on environmental backscatter includes an environmental backscatter transmitter 100, an environmental backscatter receiver 200, and a radio frequency signal 3 emitted by a radio frequency source RFs in the surrounding environment.
The ambient backscatter transmitter 100 comprises a transmitter energy harvesting unit 101, a control unit 102 and a directional beam transmitting unit 103. The transmitter energy harvesting unit 101 is connected to the control unit 102 and the directional beam transmitting unit 103, and the control unit 102 is connected to the directional beam transmitting unit 103. The transmitter energy collection unit 101 collects the radio frequency signals 3 transmitted from the radio frequency sources RFs in the surrounding environment, and the directional beam transmission unit 103 transmits a directional beam to the outside.
The ambient backscatter receiver 200 comprises a receiver energy harvesting unit 201, a signal detection unit 202 and an alarm unit 203. The receiver energy harvesting unit 201 is connected to the signal detection unit 202 and the alarm unit 203. The signal detection unit 202 is connected to an alarm unit 203. The receiver energy collecting unit 201 collects the rf signals 3 emitted from the rf sources RFs in the surrounding environment, and the signal detecting unit 202 receives the directional beams emitted from the directional beam emitting unit 103 of the environmental backscatter transmitter 100 to the outside.
In this embodiment, the transmitter energy harvesting unit 101 collects the radio frequency signal 3 emitted by the radio frequency source RFs in the surrounding environment and converts it into electrical energy for powering the control unit 102 and the directional beam emitting unit 103. The id of the transmitter (e.g., transmitter T) may be preset in the control unit 10211Is identified as id11Emitter T12Is identified as id12Etc.). The directional beam transmitting unit 103 then identifies the id output by the control unit 102 (e.g., transmitter T)11Is identified as id11Emitter T12Is identified as id12Etc.) in the form of a directional beam directed to the receiver corresponding to the receiving column, where the transmitter T11Transmitted beam pointing receiver R11In the direction of (1), transmitter T12Transmitted beam pointing receiver R12In the direction of (1), transmitter T21Transmitted beam pointing receiver R21In the direction of (1), transmitter T22Transmitted beam pointing receiver R22In the direction of the axis of rotation.
The receiver energy collecting unit 201 collects the rf signal 3 emitted by the rf source RFs in the surrounding environment and converts it into electrical energy to power the signal detecting unit 202 and the alarm unit 203. When the signal detection unit 202 detects the directional beam emitted from the directional beam emission unit 103 in the environmental backscatter emitter 100 to the outside, it indicates that the id signal can be detected, indicating that there is no intrusion, and at this time, the alarm unit 203 is not triggered to operate. When the id signal is not detected, it indicates that an intruder triggers the intrusion behavior, and the alarm unit 203 is triggered to work to remind the user that the intruder enters, so as to achieve the functions of early warning and frightening the intruder for the user.
In implementation, false alarm is avoided. The alarm unit 203 alarms only when an intruder blocks the directional beam emitted to the outside by the directional beam emitting unit 103 for more than a certain time (which may be set to 20-50 ms); when an object blocks the directional beam transmitting unit 103 instantaneously to transmit the directional beam to the outside, the alarm unit 203 does not alarm.
As shown in fig. 3 and 4, a schematic diagram of a transmitter circuit of a window alarm device based on environmental backscatter is shown, an antenna of an environmental backscatter transmitter 100 is a directional antenna ET1 with a center frequency of 539MHz, the impedance of the antenna is 50 Ω, and directional transmission of a beam can be realized by using the directional antenna. In practice, directional beam transmission is realized by adopting directional antennas and adjusting the downward inclination angles of the antennas when the antennas are arranged. The directional beam is adopted because the efficiency of the backscattering of the current environment is lower and the power is smaller, so the propagation distance of the signal is enhanced by adopting the directional beam; the radio frequency-direct current energy conversion is realized by a chip UT1, a P2110B radio frequency-direct current energy conversion chip of Powercast company is adopted by the UT1, the antenna ET1 is connected with the radio frequency-direct current energy conversion chip UT1 after impedance matching, and the load impedance of the antenna ET1 is 50 omega.
In ambient backscatter systems, the antenna should be matched to the load in conjugate, i.e. assuming an antenna impedance Za＝Ra+jXaThen load impedance
Figure BDA0002263199530000061
) Wherein R isaIs the antenna resistance, XaIs the antenna reactance, the upper corner indicates the conjugate, j is the imaginary unit.
When the antenna of the ambient backscatter transmitter 100 is matched to the load impedance, ambient energy is absorbed by the antenna into the transmitter energy harvesting unit 101; and when in mismatch with the load impedance, the ambient signal is backscattered by the antenna of the ambient backscatter transmitter 100 to the ambient backscatter receiver 200. The invention realizes impedance matching/mismatching between an antenna and a load by adjusting a radio frequency switch on the environmental backscatter transmitter 100, and determines whether the antenna on the environmental backscatter transmitter 100 receives energy or reflects a radio frequency signal, wherein the antenna of a radio frequency-direct current energy conversion chip UT1 for collecting the radio frequency signal in the environment and the antenna for transmitting a directional beam to a receiver are shared, namely UT1 and UT4 share the same antenna, and the transmitting/receiving state is determined by the turn-off/turn-on of the radio frequency switch. Further by reception by the ambient backscatter receiver 200, communication between the transmitter/receiver is achieved. In practical circuit, the implementation is realized by setting the CTT1 to be in a low/high state, when the CTT1 is set to be in a low state, the radio frequency switch UT4 is in a closed state, and the antenna of the ambient backscatter transmitter 100 backscatters ambient signals; when the CTT1 is set to the high state, the rf switch UT4 is in the conducting state, the antenna and load impedance of the ambient backscatter transmitter 100 are matched, and the ambient energy is absorbed by the transmitter energy collection unit 101.
The capacitor CT1 of the emitter energy collection unit 101 selects a super capacitor F750G228MRC with small leakage current, and the capacity value is 1 mF; the voltage stabilizing chip UT2, the capacitor CT2 and the capacitor CT3 form a voltage stabilizing circuit, the model of the voltage stabilizing chip UT2 is XC6206P302MR, the capacitance value of the capacitor CT2 is 10 muF, and the capacitance value of the capacitor CT3 is 1 muF; the control unit 102 is composed of a chip UT3, a resistor RT1, a capacitor CT4, a crystal oscillator YT1 and other peripheral circuits, wherein the UT3 adopts MSP430G2533 of TI company as a control chip, the resistance of the resistor RT1 is 5.1k Ω, the capacitance of the capacitor CT4 is 2.2 μ F, the frequency of the crystal oscillator YT1 is 8.032MHz, the capacitance of the capacitor CT5 is 12pF, and the capacitance of the capacitor CT6 is 12 pF; the directional beam transmitting unit 103 is composed of a chip UT4 and a resistor RT 2; the UT4 adopts an ADG902 RF switch, and RT2 has a resistance of 4.7k Ω.
The antenna ET1 is connected to a pin 3 of a radio frequency-direct current energy conversion chip UT1, a pin 2 and a pin 4 of UT1 are connected in parallel and then grounded, a pin 6 is connected with an INTT1 signal, a pin 7 is connected with an RSTT1 signal, a pin 8 is connected with the anode of a super capacitor CT1, a pin 11 is grounded, and a pin 12 is connected with one end of a capacitor CT2 and the pin 3 of the chip UT 2.
Pin 1 of the chip UT2 is connected with one end of the capacitor CT2 and one end of the capacitor CT3, and then is grounded;
pin 2 of the chip UT2 is connected with the other end of the capacitor CT3 and serves as an output direct-current voltage Vcc;
pin 3 of the chip UT2 is connected to pin 12 of the chip UT1 and one end of the capacitor CT 2.
Pin 1 of the chip UT3 is connected to Vcc;
pin 8 of chip UT3 connects to the CTT1 signal;
pin 9 of chip UT3 connects to the INTT1 signal;
pin 10 of the chip UT3 is connected with RSTT1 signal;
a pin 16 of the chip UT3 is connected with one end of a resistor RT1 and one end of a capacitor CT4, the other end of the resistor RT1 is connected with Vcc, and the other end of the capacitor CT4 is grounded;
the pin 18 of the chip UT3 is connected with one end of the crystal oscillator YT1 and the capacitor CT 6;
a pin 19 of the chip UT3 is connected with one end of the crystal oscillator YT1 and one end of the capacitor CT 5;
the other ends of the capacitor CT5 and the capacitor CT6 are connected in parallel and then grounded;
pin 20 of chip UT3 is connected to ground.
Pin 1 of the chip UT4 is connected to Vcc;
pin 2 of chip UT4 connects to CTT1 signal;
pin 3, pin 5, pin 6, and pin 7 of chip UT4 are grounded;
pin 4 of the chip UT4 is connected with one end of a resistor RT2, and the other end of the resistor RT2 is grounded;
pin 8 of the chip UT4 is connected to antenna AntT 1.
As shown in fig. 5 and fig. 6, a schematic diagram of a receiver circuit of a window alarm device based on environmental backscatter, an antenna ER1 of the environmental backscatter receiver 200 is an antenna with a center frequency of 539MHz, and the impedance of the antenna is 50 Ω; the radio frequency-direct current energy conversion is realized by a chip UR1, a P2110B radio frequency-direct current energy conversion chip of Powercast company is adopted by the UR1, an antenna ER1 is connected with the radio frequency-direct current energy conversion chip UR1 after impedance matching, and the load impedance of the antenna ER1 is 50 omega.
In an actual circuit, the CTR1 is always set to a high state, so that the antenna and the load impedance of the ambient backscatter receiver 200 are always in a matching state, so that the ambient energy is absorbed by the antenna of the receiver.
The capacitor CR1 of the receiver energy collection unit 201 selects a super capacitor F750G228MRC with small leakage current, and the capacity value is 1 mF; the voltage stabilizing chip UR2, the capacitor CR2 and the capacitor CR3 form a voltage stabilizing circuit, the model of the voltage stabilizing chip UR2 is XC6206P302MR, the capacitance value of the capacitor CR2 is 10 muF, and the capacitance value of the capacitor CR3 is 1 muF; the signal detection unit 202 is composed of peripheral circuits such as chips UR3, UR4 and a resistor RR2, wherein the UR3 adopts MSP430G2533 of TI company as a control chip, the chip UR4 selects a radio frequency switch with the model number of ADG902, and the resistance value of the resistor RR2 is 4.7k Ω; the alarm unit 203 is composed of a chip UR3, a resistor RR1, a triode VTR1, a buzzer SPR1 and other peripheral circuits; the resistance value of the resistor RR1 is 1k omega, the model of the triode VTR1 is NPN type 9013, and the model of the buzzer SPR1 in the alarm unit is SFM-20-A-C (2310) with small energy consumption, the resistance value is 8 omega, and the power is 0.25 w.
The antenna ER1 is connected to pin 3 of the radio frequency-direct current energy conversion chip UR1, pin 2 and pin 4 of UR1 are connected in parallel and then grounded, pin 6 is connected with an INTR1 signal, pin 7 is connected with an RSTR1 signal, pin 8 is connected with the anode of the super capacitor CR1, pin 11 is grounded, and pin 12 is connected with one end of the capacitor CR2 and pin 3 of the chip UR 2.
Pin 1 of the chip UR2 is connected to one end of the capacitor CR2 and the capacitor CR3, and then grounded;
pin 2 of the chip UR2 is connected to the other end of the capacitor CR3 and serves as the output dc voltage Vcc;
pin 3 of chip UR2 is connected to pin 12 of chip UR1 and to one end of capacitor CR 2.
Pin 1 of chip UR3 is connected to Vcc;
pin 2 of chip UR3 connects to CTR1 signal;
pin 9 of chip UR3 connects to the INTR1 signal;
pin 10 of chip UR3 is connected to RSTR1 signal;
a pin 13 of the chip UR3 is connected with one end of a resistor RR1, a triode VTR1 and a buzzer SPR1, the other end of the triode VTR1 is grounded, and the other end of the buzzer SPR1 is connected with Vcc;
pin 20 of chip UR3 is connected to ground.
Pin 1 of chip UR4 is connected to Vcc;
pin 2 of chip UR4 connects to CTR1 signal;
pin 3, pin 5, pin 6, and pin 7 of chip UR4 are grounded;
pin 4 of chip UR4 has one end of resistor RR2 and the other end of resistor RR2 grounded;
pin 8 of chip UR4 is connected to antenna AntR 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A window alarm device based on environment backscatter is characterized in that an environment backscatter transmitter and an environment backscatter receiver are arranged, the environment backscatter transmitter comprises a transmitter energy collection unit, a control unit and a directional beam transmitting unit, the transmitter energy collection unit is respectively connected with the control unit and the directional beam transmitting unit, and the control unit is connected with the directional beam transmitting unit; the environment backscatter receiver comprises a receiver energy collection unit, a signal detection unit and an alarm unit, wherein the receiver energy collection unit is respectively connected with the signal detection unit and the alarm unit, and the signal detection unit is connected with the alarm unit.
2. The window alarm apparatus of claim 1, wherein the transmitter energy harvesting unit and the receiver energy harvesting unit convert the received rf signals from the rf source surrounding the environment into electrical energy by environmental backscatter.
3. The window alarm device based on environmental backscatter as recited in claim 1, wherein the control unit presets an id of the environmental backscatter transmitter, and the directional beam transmitting unit transmits the id outputted from the control unit in the form of a directional beam.
4. The ambient backscatter based window alarm apparatus of claim 3, wherein the directional beam is directed at an ambient backscatter receiver.
5. The window alarm apparatus based on environmental backscattering of claim 1, wherein the signal detection unit is configured to detect a signal from an environmental backscattering transmitter.
CN201921903747.2U 2019-11-06 2019-11-06 Window alarm device based on environment backscatter Active CN210428742U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921903747.2U CN210428742U (en) 2019-11-06 2019-11-06 Window alarm device based on environment backscatter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921903747.2U CN210428742U (en) 2019-11-06 2019-11-06 Window alarm device based on environment backscatter

Publications (1)

Publication Number Publication Date
CN210428742U true CN210428742U (en) 2020-04-28

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Country Status (1)

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