CN213092467U - Anti-theft system - Google Patents
Anti-theft system Download PDFInfo
- Publication number
- CN213092467U CN213092467U CN202021508486.7U CN202021508486U CN213092467U CN 213092467 U CN213092467 U CN 213092467U CN 202021508486 U CN202021508486 U CN 202021508486U CN 213092467 U CN213092467 U CN 213092467U
- Authority
- CN
- China
- Prior art keywords
- signal
- unit
- ultrasonic
- receiving device
- oscillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
The utility model discloses an anti-theft system contains: a remote control unit; the early warning unit is provided with an oscillation induction element and an ultrasonic transmitting device connected with the oscillation induction element, and is wirelessly connected with the remote control unit; a monitoring unit having an ultrasonic receiving device and a signal processing element connected to the ultrasonic receiving device; and the alarm unit is provided with a sound production device connected with the signal processing element. The utility model discloses an oscillation sensing element implements the oscillation response to implement real-time transmission to oscillating signal through ultrasonic emission device, collect the signal and implement the detection of signal through ultrasonic receiving device at last, through this kind of effectual realization to oscillating signal's real-time transmission, early warning and intervention alarm effect, have sensitivity height, the wrong report rate is low, simple to operate and low price's characteristics, can effectual improvement anti-theft measure.
Description
Technical Field
The utility model relates to a theftproof technical field specifically is an anti-theft system.
Background
With the continuous progress of society, the material level of people is also continuously improved, but illegal behaviors such as theft and the like still exist, the problems of vehicle damage, property theft and the like are frequent, and how to provide an anti-theft system with higher safety and convenience on the basis of the prior art becomes a problem which needs to be solved urgently by technical personnel in the related field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an anti-theft system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an anti-theft system, comprising:
a remote control unit;
the early warning unit is provided with an oscillation induction element and an ultrasonic transmitting device connected with the oscillation induction element, and is wirelessly connected with the remote control unit;
a monitoring unit having an ultrasonic receiving device and a signal processing element connected to the ultrasonic receiving device; and
and the alarm unit is provided with a sound generating device connected with the signal processing element.
The oscillating inductive element has a threshold value of a predetermined frequency.
The frequency threshold of the oscillating induction element is 40 KHz.
The monitoring unit also comprises a signal amplifying device which is connected between the ultrasonic receiving device and the signal processing unit.
The remote control unit comprises a coding circuit and an infrared transmitter.
The early warning unit further comprises a power supply control element and an infrared receiver, wherein the power supply control element is connected between the infrared receiver and the oscillation induction element and is electrically connected with the monitoring unit.
The monitoring unit comprises an ultrasonic receiving device, a signal amplifying device, a detection filtering element and a signal processing element which are connected in sequence, and the power supply control element is electrically connected with the ultrasonic receiving device, the signal amplifying device, the detection filtering element, the signal processing element and the alarm unit.
According to the above technical scheme, the utility model discloses an oscillation sensing element implements the oscillation response to implement real-time transmission to oscillating signal through ultrasonic emission device, collect the signal and implement the detection of signal through ultrasonic receiving device at last, through the effectual real-time transmission, early warning and the intervention alarm effect of having realized oscillating signal of this kind of technological means, have sensitivity height, the misstatement rate is low, simple to operate and low price's characteristics, can effectual improvement anti-theft measures.
Drawings
FIG. 1 is a schematic view of the system of the present invention;
fig. 2 is a circuit diagram of an infrared emitter of the remote control unit of the present invention;
fig. 3 is a circuit diagram of an infrared receiver of the remote control unit of the present invention;
fig. 4 is a circuit diagram of the ultrasonic transmitter and the monitoring unit of the present invention;
fig. 5 is a circuit diagram of the signal processing element according to the present invention;
fig. 6 is a flowchart of the signal processing element according to the present invention.
In the figure: the system comprises a remote control unit 1, an early warning unit 2, a monitoring unit 3 and an alarm unit 4.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a schematic view of an anti-theft system according to an embodiment of the present invention. According to the utility model discloses an anti-theft system of embodiment contains remote control unit 1, early warning unit 2, monitoring unit 3 and alarm unit 4. Remote control unit 1 wireless connection early warning unit 2, early warning unit 2 connects monitoring unit 3 and alarm unit 4, and simultaneously, monitoring unit 3 connects alarm unit 4.
In the technical scheme of the anti-theft system of the embodiment of the utility model, the core lies in that the oscillation induction of the surface inside the specific space or wrapped by the space is implemented through the oscillation induction element, the real-time transmission is implemented to the oscillation signal through the ultrasonic transmitting device, and finally the signal is collected through the ultrasonic receiving device and the detection of the signal is implemented, and the real-time transmission, the early warning and the intervention effect to the oscillation signal are effectively realized through the technical means; for the specific space, those skilled in the art can understand that an object having a certain amount of internal space can be considered, and the surface of the object can form effective oscillation induction when being acted by external force and can be identified by the oscillation induction element, for example, a vehicle, the body of which is composed of a shell and related vehicle parts, the outer surface of the body can form oscillation induction effect generated under the action of external force, and the interior of the body has a semi-open space for carrying people or objects. In order to realize the anti-theft of the vehicle, relevant structures, elements and the like in the early warning unit 2 are arranged on the vehicle, so that the real-time oscillation information reaction collection of the vehicle can be completed, meanwhile, the receiving and processing of the real-time oscillation signals in the vehicle space can be completed by combining with the installed monitoring unit 3, and finally, the result is fed back through the alarm unit 4. The utility model discloses an anti-theft system can be different and have the change of non-standard mounted position according to the specific space of arranging, for example, the early warning unit 2, the monitoring unit 3 and the alarm unit 4 of adoption can adjust its best installation spatial position according to the spatial layout of different motorcycle types in the assembly use that is applicable to different vehicles, and this embodiment does not limit to its specific mounted position.
According to an aspect of an embodiment of the present invention, there is provided an anti-theft system, a remote control unit 1; the early warning unit 2 is provided with an oscillation induction element and an ultrasonic transmitting device connected with the oscillation induction element, and the early warning unit 2 is wirelessly connected with the remote control unit 1; the monitoring unit 3 has an ultrasonic receiving device and a signal processing element connected to the ultrasonic receiving device; the alarm unit 4 has a sound generating device connected to the signal processing element.
Here, as described above, first, the oscillation sensing element monitors an oscillation signal of the space or the surface of the object in real time and transmits the signal to the ultrasonic wave transmitting device, the ultrasonic wave transmitting device converts the oscillation signal into a signal having a corresponding frequency, and at the same time, the ultrasonic wave receiving device collects the signal frequency in real time; under the condition of no oscillation, the acquired oscillation signal has a frequency value in a certain range and does not exceed a specific frequency threshold value, so that once oscillation occurs, the ultrasonic receiving device can receive a signal with fluctuating frequency, and the anti-theft monitoring effect is achieved. It should be noted that, in order to prevent the signal interference from the outside to the ultrasonic receiving device, for example, the vehicle is located in a noisy environment, in practice, the ultrasonic receiving device is disposed in a relatively closed space, so that a good and stable environment can be formed, and the signal processing is more sensitive.
According to yet another aspect of the present invention, there is provided an anti-theft system, a remote control unit; the early warning unit 2 is provided with an oscillation induction element and an ultrasonic transmitting device connected with the oscillation induction element, and the early warning unit 2 is wirelessly connected with the remote control unit 1; the monitoring unit 3 has an ultrasonic receiving device and a signal processing element connected to the ultrasonic receiving device; the alarm unit 4 is provided with a sound production device connected with the signal processing element, and the monitoring unit 3 further comprises a signal amplification device which is connected between the ultrasonic receiving device and the signal processing unit.
As mentioned above, when the signal amplifying device is arranged, the received oscillation signal can be effectively and accurately identified, and the use sensitivity of the anti-theft system is further improved. In the embodiment, as will be understood by those skilled in the art, the signal processed by the signal amplifying device is detected by the detection filter, and it should be noted that, in practice, the detection filter is provided with a frequency threshold of 40KHz, and when the frequency threshold is exceeded, the oscillation signal fluctuation can be identified by the signal processing element, so as to alarm by the alarm unit 4.
The central detecting element is connected with a signal amplifying device, a detecting and filtering device, a signal processing element and a sounding device arranged in the alarm unit 4, and once the central detecting element is identified, an alarm signal can be sent out through the sounding device.
Next, respective control circuits of the antitheft system according to the present invention will be described with reference to fig. 2 to 5.
Fig. 2 is a schematic diagram showing the transmission circuit of the infrared transmitter of the remote control unit 1 of the anti-theft system according to the present invention. The remote control unit 1 is provided with an instruction transmitting key S, and when S is pressed, the code starting end of VD5026
Connected to low level Vss, its coded output Do outputs two identical coded bursts. The address password of VD5026 is set arbitrarily, A is set0∽A7Is connected with a high level VDDAnd A is then8∽ A11To a low level VSS. The coded pulse sent out by the Do end of the VD5026 acts on a 40KHz carrier oscillator formed by gate circuits D1, D2 and the like, amplitude keying modulation is carried out on the carrier, and infrared remote control signals are transmitted to the outside through infrared transmitting tubes VD1 and VD 2.
Fig. 3 is a schematic diagram showing an infrared receiving and control circuit of the infrared receiver of the remote control unit 1 of the antitheft system according to the present invention. The amplitude modulation signal received by the infrared receiving diode VD3 is first pre-amplified, carrier frequency-selected, pulse-demodulated, etc. by CX 20106. When the infrared press receiving tube VD3 receives the infrared light pulseDuring the burst, a demodulation pulse having a phase opposite to that of the encoding pulse is output from the pin 7 of CX20106, and is inverted by the inverter D3 and then sent to the Di terminal of the decoder VD 5028. When the encryption address code of the VD5028 is completely the same as the encryption address code of the VD5026 in the emitter, the decoding indicating end VT of the VD5028 outputs high level, the triode VT2 is conducted, the relay K is attracted, the light-emitting diode LED emits light, and the alarm circuit starts to work after being electrified. When the receiving circuit receives the remote control signal of the transmitter again, the VT end of the VD5028 outputs low level, the triode VT2 is in a cut-off state, the LED of the light-emitting diode is extinguished, and the alarm stops working. A of VD5026 and VD50280∽A11For encrypting the address-encoding input, A1-A11 may be programmed as four states ("1", "0", "open", "coupled to A0") except that A0 may be programmed only as three states ("1", "0", and "open"). When tri-stated, there is 312531000 non-repeated codes; when the four states are compiled, there are 4114194303 non-repeated codes. Therefore, the VD5026 and the VD5028 are adopted as coding and decoding circuits, and the password is very difficult to crack.
Fig. 4 is a schematic diagram showing an ultrasonic transmission and detection circuit of an antitheft system according to the present invention. The ultrasonic wave transmitting circuit is constituted by VT3, VT4, and the like. The VT3, VT4 and the ultrasonic transmitter B1 constitute a strong feedback frequency stabilization oscillation circuit. This circuit is very simple and easy to start oscillating. The ultrasonic transmitting device B1 is a feedback frequency-selecting device and a transmitting transducer. This oscillator is capable of operating very stably at the center frequency fo (40kHz) of B1. Since the ultrasonic sensor is a resonator device, the current required for driving is small, generally several mA to ten and several mA, but a driving voltage of a certain amplitude is necessary, so that the power supply voltage used by the ultrasonic transmitting circuit is relatively high, and is 12 v.
The ultrasonic wave transmitting device transmits ultrasonic waves into the vehicle with the sealed doors and windows, and the ultrasonic waves reach the ultrasonic wave receiving device B2 through multiple reflections of the inner wall of the compartment and the doors and windows. Normally, the amplitude of the ultrasonic signal received by the ultrasonic receiving device B2 is fixed, and if the vehicle body is impacted, the door is opened illegally, and the door and window glass is broken, the transmitting direction, the propagation path, etc. of the ultrasonic signal change, and the frequency of the ultrasonic signal received by the ultrasonic receiving device B2 is different from the frequency of the transmitted ultrasonic signal (i.e., doppler effect).
After a weak signal received by the ultrasonic receiving device B2 is subjected to high-gain amplification through the chopper-stabilized operational amplifier TC901, the weak signal is subjected to rectification filtering through a diode D2 and a capacitor C3, a 4OkHz signal is filtered, a Doppler signal is detected, and the Doppler signal is directly coupled to the in-phase input end of uA741 for amplification. In the figure, TC901 and uA741 are both single power supply applications, R3 and R4 form a bias voltage divider to provide 1/2 bias of power supply voltage to the non-inverting input end of the TC901, and R5 is used for improving the input impedance of the amplifying circuit, so that the purpose of improving the sensitivity of the ultrasonic receiving detection circuit can be achieved. Since uA741 is directly coupled to TC901, it is also biased at 1/2 supply voltage. The signal amplified by uA741 is half-wave rectified by VD3 and VD4 to become direct current voltage, and the direct current voltage is sent to an RA0 port of the signal processing element to determine whether to alarm, wherein, the signal processing element can be understood as a PIC singlechip by a person skilled in the art.
Fig. 5 is a circuit schematic diagram showing a signal processing element of the antitheft system according to the present invention.
In practice, the signal processing element may be a PIC microcontroller control circuit, which is used to control the alarm unit 4, using a PIC16C71 with an 8-bit a/D converter. After the alarm circuit is started through the remote control unit 1, the PIC single chip microcomputer is electrified to start working, and initialization setting is carried out on an RA interface and an RB interface. Because the working state of the circuit is not stable when the power is on, the voltage value of the port RA0 is detected after 2 seconds of delay, then the singlechip repeatedly detects the voltage value of the port RA0 and compares the voltage value with the initial measured voltage value, and the sounding device is switched on to give an alarm sound when the voltage value changes. The alarm sound is set to alarm for 1 second, stop for 1 second and alarm for 1 second again, and the steps are repeated until the alarm is relieved. After the circuit alarms, even if the ultrasonic transmitting and receiving probe is pulled out, the alarm is still continued, and the alarm can be relieved only by turning off the main power supply of the alarm circuit through the remote control unit 1. Because the PIC16C71 singlechip contains an A/D converter, the analog reference voltage can be set as the power supply voltage or the voltage of an RA3 pin by software, and the power supply voltage is used as the reference voltage in the circuit. The A/D module has 3 registers, A/D conversion result register (ADRES), A/D control register 0(AD CON0) and A/D control register 1(AD CON 1). The A/D control register 0 controls the work of the A/D module, the power-on reset value of the register is 00H, the unused bit is 0 when reading is executed, writing cannot be executed, and other bits can be read and written. The A/D control register 1 only uses 0-2 bits, the 3 bits are configuration bits of the A/D conversion port, and the bits configure the analog port into different working modes including analog quantity input and output, digital quantity input and output and reference voltage (RA 3).
Fig. 6 is a flowchart showing the procedure of the signal processing element of the anti-theft system according to the present invention, and the a/D conversion procedure is given below by taking the RA0 channel as an example as follows:
BSF STATUS, RP 0; selecting Page 1
BCF STATUS, RP 0; selecting Page 1
MOVWF ADCON0
BSF INTCON, ADIE; enabling A/D interrupts
BSF INFCON, GIE; enabling full interrupts
BSF ADCON0, GO; the a/D conversion starts.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. An anti-theft system, characterized by: comprises the following steps:
a remote control unit;
the early warning unit is provided with an oscillation induction element and an ultrasonic transmitting device connected with the oscillation induction element, and is wirelessly connected with the remote control unit;
a monitoring unit having an ultrasonic receiving device and a signal processing element connected to the ultrasonic receiving device; and
and the alarm unit is provided with a sound generating device connected with the signal processing element.
2. An anti-theft system, according to claim 1, characterized in that: the oscillating inductive element has a threshold value of a predetermined frequency.
3. An anti-theft system according to claim 2, characterized in that: the frequency threshold of the oscillating induction element is 40 KHz.
4. An anti-theft system, according to claim 1, characterized in that: the monitoring unit also comprises a signal amplifying device which is connected between the ultrasonic receiving device and the signal processing unit.
5. An anti-theft system, according to claim 1, characterized in that: the remote control unit comprises a coding circuit and an infrared transmitter.
6. An anti-theft system, according to claim 5, characterized in that: the early warning unit further comprises a power supply control element and an infrared receiver, wherein the power supply control element is connected between the infrared receiver and the oscillation induction element and is electrically connected with the monitoring unit.
7. An anti-theft system according to claim 6, characterized in that: the monitoring unit comprises an ultrasonic receiving device, a signal amplifying device, a detection filtering element and a signal processing element which are connected in sequence, and the power supply control element is electrically connected with the ultrasonic receiving device, the signal amplifying device, the detection filtering element, the signal processing element and the alarm unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021508486.7U CN213092467U (en) | 2020-07-23 | 2020-07-23 | Anti-theft system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021508486.7U CN213092467U (en) | 2020-07-23 | 2020-07-23 | Anti-theft system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213092467U true CN213092467U (en) | 2021-04-30 |
Family
ID=75626871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021508486.7U Active CN213092467U (en) | 2020-07-23 | 2020-07-23 | Anti-theft system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213092467U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115005842A (en) * | 2022-08-09 | 2022-09-06 | 之江实验室 | Frequency-modulated brain-computer interface chip input impedance enhancing method and system |
-
2020
- 2020-07-23 CN CN202021508486.7U patent/CN213092467U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115005842A (en) * | 2022-08-09 | 2022-09-06 | 之江实验室 | Frequency-modulated brain-computer interface chip input impedance enhancing method and system |
| CN115005842B (en) * | 2022-08-09 | 2022-11-15 | 之江实验室 | Frequency-modulated brain-computer interface chip input impedance enhancing method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202221614U (en) | Home security system | |
| TWM274284U (en) | Vehicular steering wheel lock having burglar alarm device | |
| US20100164742A1 (en) | Activation circuit for sealed electronic device | |
| CN213092467U (en) | Anti-theft system | |
| JPH07504494A (en) | Electromagnetic detection system for parking | |
| US4538139A (en) | Signalling apparatus | |
| US6885301B2 (en) | Security system for windows | |
| JP2004299536A (en) | Sensor system for tire | |
| CN202669748U (en) | Automobile anti-theft alarm system | |
| CN205942998U (en) | Infant sleep monitor system | |
| CN201066535Y (en) | Handheld remote controller with self-coding password and its theft prevention host | |
| CN112419633A (en) | Anti-theft alarm device using public communication network | |
| CN205334659U (en) | Infrared alarm based on AT89C51 singlechip | |
| JP2831181B2 (en) | Anti-theft device | |
| TWI322102B (en) | ||
| JP3145563B2 (en) | Patient detection device | |
| JPH11154286A (en) | Security sensor system with pet countermeasure | |
| JPH09212761A (en) | Device to be monitored and monitor device | |
| JP3118399U (en) | Anti-theft alarm device car handle lock | |
| CN2336414Y (en) | Multifunctional remote control alarm | |
| CN201035695Y (en) | Active detection type children quilt-off alarm | |
| KR200322981Y1 (en) | Detecting Device for Laser and Radar | |
| US20080246608A1 (en) | Multi-functional burglar-proof lockset assembly structure | |
| CN200976048Y (en) | Infrared barrier-measuring wristwatch | |
| KR100505041B1 (en) | Detecting Device for Laser and Radar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |