Wireless tracker and tamper alarm circuit

Abstract

The utility model relates to the technical field of electronic circuits, and discloses a wireless tracker and a tamper alarm circuit. The wireless tracker comprises a tamper alarm circuit and an alarm module which are electrically connected in sequence, and the tamper alarm circuit comprises a photosensitive sensor and a switch module which are electrically connected in sequence, the photosensitive sensor is used for determining whether the wireless tracker is detached or not by detecting light changes in real time when the wireless tracker is tightly attached to goods and sending a switching signal to the switching module when it is determined that the wireless tracker is detached. The switch module is used for being switched on when receiving the switch signal sent by the photosensitive sensor and outputting an interruption signal of anti-disassembly alarm to the alarm module; and the alarm module is used for sending out a preset alarm when receiving the interruption signal of the anti-disassembly alarm output by the switch module. Therefore, the practicability and the reliability of the tamper alarm function of the wireless tracker can be improved, the cost of the wireless tracker is reduced, and the competitiveness of the wireless tracker is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and in particular to a wireless tracker and an anti-disassembly alarm circuit. Background Art

[0002] At present, wireless trackers are widely used in cold chain logistics and other scenarios as an efficient real-time monitoring and tracking device, providing accurate location and environmental information, providing enterprises with efficient logistics management and asset protection solutions, and playing an important role in modern supply chain and asset management. The anti-tampering alarm function of wireless trackers is of irreplaceable importance and necessity in modern asset management and logistics. It not only protects the security of goods and data, but also improves customer trust and satisfaction. By timely detecting and handling abnormal situations, the anti-tampering alarm function helps enterprises reduce losses and improve operational efficiency.

[0003] The anti-dismantling alarm function of current wireless trackers still has some drawbacks in practical applications. For example, sensor failure or design defects may result in failure to promptly alarm when the device is illegally dismantled, resulting in low practicality and reliability of the anti-dismantling alarm function of the wireless tracker. Missed reports will cause the anti-dismantling function to lose its due effect and bring risks to assets. At the same time, the current anti-dismantling alarm function solution for wireless trackers is relatively complex and costly. Utility Model Content

[0004] The embodiment of the utility model aims to provide a wireless tracker and an anti-disassembly alarm circuit, which can solve the problems of low practicality and reliability and high cost of the anti-disassembly alarm function of the existing wireless tracker.

[0005] In order to solve the above technical problems, the first embodiment of the utility model provides a wireless tracker, including an anti-disassembly alarm circuit and an alarm module electrically connected in sequence, wherein:

[0006] The anti-disassembly alarm circuit includes a photosensitive sensor and a switch module which are electrically connected in sequence, wherein the photosensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is closely attached to the goods, and send a switch signal to the switch module when it is determined that the wireless tracker is disassembled; the switch module is used to conduct when receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module;

[0007] The alarm module is used to issue a preset alarm when receiving an interrupt signal of the anti-disassembly alarm output by the switch module.

[0008] Optionally, the photosensor is a photodiode, an anode of the photodiode is electrically connected to a reference voltage terminal, and a cathode of the photodiode is electrically connected to the switch module.

[0009] Optionally, the anti-disassembly alarm circuit further includes a filtering module, which is electrically connected to the output end of the photosensor and is used to filter the switch signal output by the photosensor.

[0010] Optionally, the filtering module includes a first capacitor and a first resistor, the first end of the first capacitor is connected to the first end of the first resistor and then electrically connected to the negative electrode of the photodiode, and the second end of the first capacitor is connected to the second end of the first resistor and then grounded.

[0011] Optionally, the anti-tampering alarm circuit further includes a current limiting module, which is disposed between the photosensitive sensor and the switch module and is used to control the switching speed and stability of the switch module.

[0012] Optionally, the current limiting module includes a second resistor, a first end of the second resistor is electrically connected to the cathode of the photosensitive diode, and a second end of the second resistor is electrically connected to the input end of the switch module.

[0013] Optionally, the anti-tampering alarm circuit further includes a voltage dividing module, which is arranged between the photosensor and the switch module and is used to divide the reference voltage.

[0014] Optionally, the voltage divider module includes a second resistor and a third resistor, the first end of the second resistor is electrically connected to the negative electrode of the photosensitive diode, the second end of the second resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is grounded, and the connection end between the second end of the second resistor and the first end of the third resistor serves as a voltage divider output end and is electrically connected to the input end of the switch module.

[0015] Optionally, the switch module includes an NMOS tube, a gate of the NMOS tube is electrically connected to the connection end of the second resistor and the third resistor, the source of the NMOS tube is grounded, the drain of the NMOS tube is electrically connected to the reference voltage end, and the drain of the NMOS tube serves as an output end electrically connected to the alarm module to output an interrupt signal of the anti-dismantling alarm to the alarm module.

[0016] Accordingly, the second aspect of the present invention provides an anti-disassembly alarm circuit, which is applied to a wireless tracker. The anti-disassembly alarm circuit includes a photosensitive sensor and a switch module which are electrically connected in sequence, wherein:

[0017] The light-sensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is attached to the cargo, and to send a switch signal to the switch module when it is determined that the wireless tracker is disassembled;

[0018] The switch module is used to be turned on upon receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module.

[0019] Compared with the prior art, the utility model provides a wireless tracker and an anti-disassembly alarm circuit, the wireless tracker includes an anti-disassembly alarm circuit and an alarm module which are electrically connected in sequence, wherein: the anti-disassembly alarm circuit includes a photosensitive sensor and a switch module which are electrically connected in sequence, wherein the photosensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is close to the goods, and sends a switch signal to the switch module when it is determined that the wireless tracker is disassembled; the switch module is used to conduct when receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module; the alarm module is used to send a preset alarm when receiving the interrupt signal of the anti-disassembly alarm output by the switch module. The utility model uses a photosensitive sensor through the anti-disassembly alarm circuit, which can very sensitively detect the change of light and improve the reliability of the anti-disassembly alarm of the wireless tracker; the photosensitive sensor can detect any abnormal opening of the wireless tracker housing, enhance the anti-disassembly protection function, and prevent the wireless tracker from being illegally disassembled or tampered with; the photosensitive sensor has a low cost, making the implementation of the wireless tracker more economical and reducing the cost of the wireless tracker. Thereby, the practicality and reliability of the anti-tampering alarm function of the wireless tracker can be improved, and at the same time, the cost of the wireless tracker can be reduced and the competitiveness of the wireless tracker can be enhanced. Thereby, the problem of low practicality and reliability and high cost of the anti-tampering alarm function of the existing wireless tracker can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 It is a structural schematic diagram of a wireless tracker provided by the utility model;

[0022] Figure 2 It is a detailed structural diagram of a wireless tracker provided by the utility model;

[0023] Figure 3 It is a schematic diagram of an anti-disassembly alarm circuit in a wireless tracker provided by the utility model;

[0024] Figure 4 It is a schematic diagram of a shell in a wireless tracker provided by the utility model.

[0025] Description of main component symbols:

[0026] DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0029] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] At present, wireless trackers are widely used in cold chain logistics and other scenarios as an efficient real-time monitoring and tracking device, providing accurate location and environmental information. Wireless trackers provide enterprises with efficient logistics management and asset protection solutions through their multifunctional characteristics and high reliability. They play an important role in modern supply chain and asset management, not only improving the efficiency of supply chain and asset management, but also providing guarantee for the safe transportation of temperature-sensitive products.

[0031] The wireless tracker has GNSS (Global Navigation Satellite System) positioning function, temperature, humidity, air pressure and light monitoring function, LTE / NB-IoT wireless communication and Bluetooth short-range communication function, as well as data storage and platform reporting function. It has high precision, low power consumption, and large-capacity battery, the highest level of dust and water resistance, and can adapt to various harsh environments.

[0032] The tamper alarm function of wireless trackers is of irreplaceable importance and necessity in modern asset management and logistics. It not only protects the safety of goods and data, but also improves customer trust and satisfaction. By timely detecting and handling abnormal situations, the tamper alarm function helps companies reduce losses and improve operational efficiency. Therefore, when designing and selecting wireless trackers, the tamper alarm function should be regarded as a core function.

[0033] Although the anti-dismantling alarm function of wireless trackers has significant advantages in terms of security and asset protection, the current anti-dismantling alarm function of wireless trackers still has some disadvantages in actual applications. For example, sensor failure or design defects may result in failure to alarm in time when the equipment is illegally dismantled; missed reports will cause the anti-dismantling function to lose its due effect and bring risks to assets; at the same time, the current anti-dismantling alarm function solution of wireless trackers is relatively complex and costly.

[0034] To this end, the utility model provides a wireless tracker 100, such as Figure 1 As shown, the wireless tracker 100 includes an anti-tampering alarm circuit 10 and an alarm module 20 which are electrically connected in sequence, wherein:

[0035] The anti-tamper alarm circuit 10 includes a photosensitive sensor 11 and a switch module 15 which are electrically connected in sequence; wherein:

[0036] The light sensor 11 is used to determine whether the wireless tracker 100 is disassembled by detecting light changes in real time when the wireless tracker 100 is attached to the cargo, and to send a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled;

[0037] The switch module 15 is used to conduct when receiving the switch signal sent by the photosensitive sensor 11, and output an interrupt signal of the anti-disassembly alarm to the alarm module 20;

[0038] The alarm module 20 is used to issue a preset alarm when receiving an interrupt signal of the anti-disassembly alarm output by the switch module 15 .

[0039] In this embodiment, a wireless tracker is provided, comprising an anti-disassembly alarm circuit and an alarm module which are electrically connected in sequence, wherein: the anti-disassembly alarm circuit comprises a photosensitive sensor and a switch module which are electrically connected in sequence, the photosensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is close to the goods, and sends a switch signal to the switch module when it is determined that the wireless tracker is disassembled; the switch module is used to conduct when receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module; the alarm module is used to send a preset alarm when receiving the interrupt signal of the anti-disassembly alarm output by the switch module. The utility model uses a photosensitive sensor through the anti-disassembly alarm circuit, which can very sensitively detect the change of light and improve the reliability of the anti-disassembly alarm of the wireless tracker; the photosensitive sensor can detect any abnormal opening of the wireless tracker housing, enhance the anti-disassembly protection function, and prevent the wireless tracker from being illegally disassembled or tampered with; the photosensitive sensor has a low cost, making the implementation of the wireless tracker more economical, and can reduce the cost of the wireless tracker. Thereby, the practicality and reliability of the anti-disassembly alarm function of the wireless tracker can be improved, and the cost of the wireless tracker can be reduced, and the competitiveness of the wireless tracker can be enhanced. Thereby, the problems of low practicality and reliability and high cost of the anti-dismantling alarm function of the existing wireless tracker can be solved.

[0040] In one embodiment, the photosensor 11 is used to determine whether the wireless tracker 100 is disassembled by detecting light changes in real time when the wireless tracker 100 is attached to the cargo, and sends a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled.

[0041] For example, Figure 3 As shown, the light sensor 11 can be a photodiode D1, the anode of the photodiode D1 is electrically connected to the reference voltage VDD terminal, and the cathode of the photodiode D1 is electrically connected to the switch module 15. When the wireless tracker 100 is attached to the cargo, the photodiode D1 detects light changes in real time to determine whether the wireless tracker 100 is disassembled, and sends a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled.

[0042] The output signal of the photodiode D1 is a photocurrent, the magnitude of which is proportional to the intensity of the incident light. The higher the intensity of the incident light, the greater the photocurrent generated.

[0043] In this embodiment, the photosensitive sensor can be nested on the outer surface of the wireless tracker housing. The photosensitive sensor can very sensitively detect changes in light. Even small changes in light can be accurately sensed, thereby improving the reliability of the wireless tracker's anti-tampering alarm. At the same time, the photosensitive sensor can detect any abnormal opening of the wireless tracker housing, thereby improving the reliability of the wireless tracker's anti-tampering alarm, enhancing the wireless tracker's anti-tampering protection function, and preventing the wireless tracker from being illegally disassembled or tampered with. At the same time, the cost of the photosensitive sensor is low, making the implementation of the wireless tracker more economical, which can reduce the cost of the wireless tracker, making the anti-tampering alarm application of the wireless tracker more significantly advantageous, and enhancing the competitiveness of the wireless tracker.

[0044] In one embodiment, Figure 3 As shown, the anti-disassembly alarm circuit 10 further includes a filter module 12, which is electrically connected to the output end of the photosensitive sensor 11 and is used to filter the switch signal output by the photosensitive sensor 11 and filter the interference signal in the switch signal.

[0045] For example, the filter module 12 includes a first capacitor C1 , a first end of the first capacitor C1 is electrically connected to the cathode of the photodiode D1 , and a second end of the first capacitor C1 is grounded.

[0046] For example, Figure 3 As shown, the filtering module 12 includes a first capacitor C1 and a first resistor R1, the first capacitor C1 and the first resistor R1 are connected in parallel, the first end of the first capacitor C1 is connected to the first end of the first resistor R1 and then electrically connected to the negative electrode of the photosensitive diode D1, and the second end of the first capacitor C1 is connected to the second end of the first resistor R1 and then grounded.

[0047] In one embodiment, Figure 3 As shown, the anti-tampering alarm circuit 10 further includes a current limiting module 13 , which is disposed between the photosensitive sensor 11 and the switch module 15 and is used to control the switching speed and stability of the switch module 15 .

[0048] Specifically, Figure 3 As shown, the current limiting module 13 includes a second resistor R2 , a first end of the second resistor R2 is electrically connected to the cathode of the photodiode D1 , and a second end of the second resistor R2 is electrically connected to the input end of the switch module 15 .

[0049] In one embodiment, Figure 3 As shown, the anti-disassembly alarm circuit 10 also includes a voltage divider module 14, which is arranged between the photosensor 11 and the switch module 15, and is used to divide the reference voltage VDD to ensure that the voltage input to the switch module 15 is within the rated voltage range of the switch module 15 to avoid damaging the switch module 15.

[0050] Specifically, Figure 3 As shown, the voltage divider module 14 includes a second resistor R2 and a third resistor R3, the second resistor R2 and the third resistor R3 are connected in series, the first end of the second resistor R2 is electrically connected to the negative electrode of the photosensitive diode D1, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded, and the connection end between the second end of the second resistor R2 and the first end of the third resistor R3 is electrically connected to the input end of the switch module 15 as a voltage divider output end.

[0051] In one embodiment, the switch module 15 is configured to be turned on upon receiving a switch signal from the photosensor 11 , and output an interrupt signal of the anti-disassembly alarm to the alarm module 20 .

[0052] Specifically, Figure 3 As shown, the switch module 15 includes an NMOS tube VT1, the gate of the NMOS tube VT1 is electrically connected to the connection end of the second resistor R2 and the third resistor R3 as the voltage divider output end as the input end of the NMOS tube VT1, the source of the NMOS tube VT1 is grounded, the drain of the NMOS tube VT1 is electrically connected to the reference voltage VDD end after passing through the fourth resistor R4, and the drain of the NMOS tube VT1 is electrically connected to the alarm module 20 as the output end of the NMOS tube VT1, and outputs the interrupt signal of the anti-dismantling alarm to the alarm module 20.

[0053] When the photodiode D1 (i.e., photosensitive sensor) embedded in the outer surface of the wireless tracker shell detects changes in light, it can be determined that the wireless tracker shell has been opened abnormally. When it is determined that the wireless tracker has been disassembled, the photodiode D1 is turned on. At this time, after the reference voltage VDD is divided by the second resistor R2 and the third resistor R3, the gate voltage input to the NMOS tube VT1 is pulled up. When the photodiode D1 is turned on, the switch signal sent to the NMOS tube VT1 is high, the NMOS tube VT1 is turned on, and the drain of the NMOS tube VT1 outputs the interrupt signal of the anti-disassembly alarm to the alarm module.

[0054] It is understandable that the switch module 15 may also include other devices that can realize the switching function. For example, the switch module 15 may also include a PMOS tube, an NPN transistor, or a PNP transistor. When the switch module adopts the above devices, the connection relationship between the above devices and other components is also changed with the characteristics of the devices, which will not be repeated here.

[0055] In one embodiment, Figure 2As shown, the wireless tracker 100 also includes a processing module 30, which is electrically connected to the anti-dismantling alarm circuit 10 and the alarm module 20 respectively. The processing module 30 is used to receive the interrupt signal of the anti-dismantling alarm output by the anti-dismantling alarm circuit 10, and output the alarm signal to the alarm module 20, so that the alarm module 20 issues a preset alarm when receiving the alarm signal output by the processing module 30.

[0056] Specifically, Figure 2 As shown, the processing module 30 is electrically connected to the switch module 15 and the alarm module 20 of the anti-dismantling alarm circuit 10 respectively. The processing module 30 is used to receive the interrupt signal of the anti-dismantling alarm output by the switch module 15, and output the alarm signal to the alarm module 20, so that the alarm module 20 issues a preset alarm when receiving the alarm signal output by the processing module 30.

[0057] like Figure 3 As shown, when the photodiode D1 (i.e., photosensitive sensor) embedded in the outer surface of the wireless tracker shell detects the change of light, it can be determined that the wireless tracker shell is opened abnormally and the wireless tracker 100 is disassembled, and the photodiode D1 is turned on. At this time, after the reference voltage VDD is divided by the second resistor R2 and the third resistor R3, the gate voltage input to the NMOS tube VT1 is pulled up. When the photodiode D1 is turned on, the switch signal sent to the NMOS tube VT1 is high level, the NMOS tube VT1 is turned on, and the drain of the NMOS tube VT1 outputs a low-level anti-disassembly alarm interrupt signal to the processing module 30, so that the pin MCU_INPUT electrically connected to the drain of the processing module 30 and the NMOS tube VT1 changes from a high level to a low level. For the processing module 30, there is an interrupt signal with a falling edge, which plays the role of anti-disassembly interrupt reporting and then alarming. The processing module 30 outputs an alarm signal to the alarm module 20, so that the alarm module 20 issues a preset alarm when receiving the alarm signal output by the processing module 30.

[0058] It is understandable that the processing module 30 is an integrated circuit chip with signal processing capabilities. For example, the processing module 30 can be a general-purpose processor, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.; the general-purpose processor can be a microprocessor, an MCU (Microcontroller Unit) or any conventional processor, etc. In this embodiment, the processing module 30 is preferably an MCU.

[0059] In one embodiment, Figure 1As shown, the alarm module 20 is used to issue a preset alarm when receiving an interruption signal of the anti-disassembly alarm output by the switch module 15 .

[0060] Specifically, the alarm module 20 includes a speaker or a photoelectric device. The preset alarm includes a sound alarm or a photoelectric signal alarm.

[0061] When the alarm module 20 is a speaker, the preset alarm is sound, and the speaker emits a sound alarm when receiving the alarm signal output by the switch module.

[0062] When the alarm module 20 is a photoelectric device, the preset alarm is a photoelectric signal alarm, and when the photoelectric device receives the alarm signal output by the switch module, a photoelectric signal alarm is issued.

[0063] As another optional embodiment, Figure 2 As shown, the alarm module 20 is electrically connected to the processing module 30 , and the alarm module 20 issues a preset alarm when receiving the alarm signal output by the processing module 30 .

[0064] In this embodiment, by setting an alarm module in the wireless tracker, a preset sound alarm or photoelectric signal alarm can be issued when it is confirmed that the wireless tracker has been abnormally disassembled, so as to remind the user that the wireless tracker has been abnormally disassembled and to pay close attention to the safety of the goods tightly bound to the wireless tracker.

[0065] In one embodiment, Figure 2 As shown, the wireless tracker 100 also includes a wireless communication module 40, which is electrically connected to the processing module 30 and is used to wirelessly interact with the cloud platform according to the communication signal output by the processing module 30. Thus, the wireless tracker 100 has a wireless communication function (such as LTE / NB-IoT wireless communication and Bluetooth short-range communication function) and a function of reporting data to the cloud platform.

[0066] In one embodiment, Figure 2 As shown, the wireless tracker 100 also includes a positioning module 50, which is electrically connected to the processing module 30 and is used to perform real-time positioning of the wireless tracker 100 to obtain real-time positioning information of the wireless tracker 100. The real-time positioning information is acquired in real time by the processing module 30 and is sent to the cloud platform by the processing module 30 through the wireless communication module 40, so that the cloud platform can acquire the real-time positioning information of the wireless tracker 100 in real time, thereby enabling the cloud platform to acquire the real-time positioning information of the goods in real time.

[0067] In one embodiment, the wireless tracker 100 also includes a power module (not shown), which is electrically connected to the alarm module 20 , the processing module 30 , the wireless communication module 40 and the positioning module 50 , respectively, for supplying power to the alarm module 20 , the processing module 30 , the wireless communication module 40 and the positioning module 50 .

[0068] Specifically, the power module outputs a reference voltage VDD, so that the reference voltage VDD supplies power to the alarm module 20 , the processing module 30 , the wireless communication module 40 and the positioning module 50 .

[0069] For example, the power module is a large-capacity battery.

[0070] In one embodiment, Figure 4 As shown, the wireless tracker 100 also includes a circuit board 70, the switch module 15 in the anti-dismantling alarm circuit 10 is arranged on the circuit board, the processing module 30 is arranged on the circuit board 70, the wireless communication module 40 and the positioning module 50 are arranged on the circuit board 70, and the power module 60 is arranged on the circuit board 70.

[0071] In one embodiment, Figure 4 As shown, the wireless tracker 100 also includes a shell 80 , the circuit board 70 is disposed inside the shell 80 , and the alarm module 20 is nested on the outer surface of the shell 80 .

[0072] The photosensitive sensor 11 in the anti-dismantling alarm circuit 10 is arranged on the outer surface of the shell 80. Specifically, the photosensitive sensor 11 is arranged on the outer surface of the bottom of the shell 80. When the wireless tracker 100 is pressed against the cargo, the bottom of the shell 80 is pressed against the cargo, so that the photosensitive sensor 11 is also pressed against the cargo. In this way, the photosensitive sensor can detect changes in light very sensitively, and even slight changes in light can be accurately sensed, thereby improving the reliability of the anti-dismantling alarm of the wireless tracker; at the same time, the photosensitive sensor can detect any abnormal opening of the wireless tracker shell to determine whether the wireless tracker 100 has been disassembled, thereby improving the reliability of the anti-dismantling alarm of the wireless tracker, enhancing the anti-dismantling protection function of the wireless tracker, and preventing the wireless tracker from being illegally disassembled or tampered with.

[0073] The utility model provides a wireless tracker 100, and the specific use process thereof is as follows:

[0074] The wireless tracker 100 is placed close to the goods to be monitored, so that the bottom of the housing 80 of the wireless tracker 100 is in close contact with the goods, thereby making the photosensitive diode D1 in the anti-tampering alarm circuit 10 also in close contact with the goods.

[0075] When the shell 80 of the wireless tracker 100 is opened or damaged, the photodiode D1 can very sensitively detect the light changes of the shell 80 of the wireless tracker 100, determine that the wireless tracker 100 is disassembled, and trigger the anti-disassembly alarm circuit 10 to start working. The photodiode D1 is turned on, and the switching signal sent by the photodiode D1 to the NMOS tube VT1 is a high level, so that the NMOS tube VT1 is turned on, and the drain of the NMOS tube VT1 outputs a low-level anti-disassembly alarm interrupt signal to the processing module 30, so that the pin MCU_INPUT electrically connected to the drain of the processing module 30 and the NMOS tube VT1 changes from a high level to a low level. For the processing module 30, there is a falling edge interrupt signal, which plays the role of anti-disassembly interrupt reporting and then alarming. The processing module 30 outputs an alarm signal to the alarm module 20, so that the alarm module 20 issues a preset alarm when receiving the alarm signal output by the processing module 30. Therefore, when the shell 80 of the wireless tracker 100 is opened or damaged, the anti-dismantling alarm can be triggered, thereby improving the reliability of the anti-dismantling alarm of the wireless tracker, enhancing the anti-dismantling protection function of the wireless tracker, preventing the wireless tracker from being illegally disassembled or tampered with, and reducing the cost of the wireless tracker.

[0076] Based on the same concept, Figure 4 As shown, the utility model provides an anti-disassembly alarm circuit 10, which is applied to a wireless tracker. The anti-disassembly alarm circuit 10 includes a photosensitive sensor 11 and a switch module 15 which are electrically connected in sequence; wherein:

[0077] The light sensor 11 is used to determine whether the wireless tracker 100 is disassembled by detecting light changes in real time when the wireless tracker 100 is attached to the cargo, and to send a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled;

[0078] The switch module 15 is used to be turned on upon receiving a switch signal from the photosensor 11 , and output an interrupt signal of the anti-disassembly alarm to the alarm module 20 , so that the alarm module 20 issues a preset alarm.

[0079] In this embodiment, an anti-disassembly alarm circuit is provided and applied to a wireless tracker. The anti-disassembly alarm circuit includes a photosensitive sensor and a switch module which are electrically connected in sequence; wherein the photosensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is close to the goods, and sends a switch signal to the switch module when it is determined that the wireless tracker is disassembled; the switch module is used to conduct when receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module, so that the alarm module sends a preset alarm. The utility model uses a photosensitive sensor through the anti-disassembly alarm circuit, which can very sensitively detect the change of light and improve the reliability of the anti-disassembly alarm of the wireless tracker to which the anti-disassembly alarm circuit is applied; the photosensitive sensor can detect any abnormal opening of the wireless tracker housing, enhance the anti-disassembly protection function, and prevent the wireless tracker from being illegally disassembled or tampered with; the photosensitive sensor has a low cost, making the implementation of the wireless tracker more economical and reducing the cost of the wireless tracker. Thereby, the practicality and reliability of the anti-disassembly alarm function of the wireless tracker can be improved, and the cost of the wireless tracker can be reduced. Thereby, the problem of low practicality and reliability and high cost of the anti-disassembly alarm function of the existing wireless tracker can be solved.

[0080] In one embodiment, the photosensor 11 is used to determine whether the wireless tracker 100 is disassembled by detecting light changes in real time when the wireless tracker 100 is attached to the cargo, and sends a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled.

[0081] For example, Figure 3 As shown, the light sensor 11 can be a photodiode D1, the anode of the photodiode D1 is electrically connected to the reference voltage VDD terminal, and the cathode of the photodiode D1 is electrically connected to the switch module 15. When the wireless tracker 100 is attached to the cargo, the photodiode D1 detects light changes in real time to determine whether the wireless tracker 100 is disassembled, and sends a switch signal to the switch module 15 when it is determined that the wireless tracker 100 is disassembled.

[0082] The output signal of the photodiode D1 is a photocurrent, the magnitude of which is proportional to the intensity of the incident light. The higher the intensity of the incident light, the greater the photocurrent generated.

[0083] In this embodiment, the photosensitive sensor can be nested on the outer surface of the wireless tracker housing. The photosensitive sensor can very sensitively detect changes in light. Even small changes in light can be accurately sensed, thereby improving the reliability of the wireless tracker's anti-tampering alarm. At the same time, the photosensitive sensor can detect any abnormal opening of the wireless tracker housing, thereby improving the reliability of the wireless tracker's anti-tampering alarm, enhancing the wireless tracker's anti-tampering protection function, and preventing the wireless tracker from being illegally disassembled or tampered with. At the same time, the cost of the photosensitive sensor is low, making the implementation of the wireless tracker more economical, which can reduce the cost of the wireless tracker, making the anti-tampering alarm application of the wireless tracker more significantly advantageous, and enhancing the competitiveness of the wireless tracker.

[0084] In one embodiment, Figure 3 As shown, the anti-disassembly alarm circuit 10 further includes a filter module 12, which is electrically connected to the output end of the photosensitive sensor 11 and is used to filter the switch signal output by the photosensitive sensor 11 and filter the interference signal in the switch signal.

[0085] For example, the filter module 12 includes a first capacitor C1 , a first end of the first capacitor C1 is electrically connected to the cathode of the photodiode D1 , and a second end of the first capacitor C1 is grounded.

[0086] For example, Figure 3 As shown, the filtering module 12 includes a first capacitor C1 and a first resistor R1, the first capacitor C1 and the first resistor R1 are connected in parallel, the first end of the first capacitor C1 is connected to the first end of the first resistor R1 and then electrically connected to the negative electrode of the photosensitive diode D1, and the second end of the first capacitor C1 is connected to the second end of the first resistor R1 and then grounded.

[0087] In one embodiment, Figure 3 As shown, the anti-tampering alarm circuit 10 further includes a current limiting module 13 , which is disposed between the photosensitive sensor 11 and the switch module 15 and is used to control the switching speed and stability of the switch module 15 .

[0088] Specifically, Figure 3 As shown, the current limiting module 13 includes a second resistor R2 , a first end of the second resistor R2 is electrically connected to the cathode of the photodiode D1 , and a second end of the second resistor R2 is electrically connected to the input end of the switch module 15 .

[0089] In one embodiment, Figure 3 As shown, the anti-disassembly alarm circuit 10 further includes a voltage dividing module 14, which is used to divide the reference voltage VDD to ensure that the voltage input to the switch module 15 is within the rated voltage range of the switch module 15 to avoid damaging the switch module 15.

[0090] Specifically, Figure 3 As shown, the voltage divider module 14 includes a second resistor R2 and a third resistor R3, the second resistor R2 and the third resistor R3 are connected in series, the first end of the second resistor R2 is electrically connected to the first end of the first capacitor C1, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded, and the connection end between the second end of the second resistor R2 and the first end of the third resistor R3 is electrically connected to the input end of the switch module 15 as a voltage divider output end.

[0091] In one embodiment, the switch module 15 is configured to be turned on upon receiving a switch signal from the photosensor 11 , and output an interrupt signal of the anti-disassembly alarm to the alarm module 20 .

[0092] Specifically, Figure 3 As shown, the switch module 15 includes an NMOS tube VT1, the gate of the NMOS tube VT1 is electrically connected to the connection end of the second resistor R2 and the third resistor R3 as the voltage divider output end as the input end of the NMOS tube VT1, the source of the NMOS tube VT1 is grounded, the drain of the NMOS tube VT1 is electrically connected to the reference voltage VDD end after passing through the fourth resistor R4, and the drain of the NMOS tube VT1 is electrically connected to the alarm module 20 as the output end of the NMOS tube VT1, and outputs the interrupt signal of the anti-dismantling alarm to the alarm module 20.

[0093] When the photodiode D1 (i.e., photosensitive sensor) embedded in the outer surface of the wireless tracker shell detects changes in light, it can be determined that the wireless tracker shell has been opened abnormally. When it is determined that the wireless tracker has been disassembled, the photodiode D1 is turned on. At this time, after the reference voltage VDD is divided by the second resistor R2 and the third resistor R3, the gate voltage input to the NMOS tube VT1 is pulled up. When the photodiode D1 is turned on, the switch signal sent to the NMOS tube VT1 is high, the NMOS tube VT1 is turned on, and the drain of the NMOS tube VT1 outputs the interrupt signal of the anti-disassembly alarm to the alarm module.

[0094] It is understandable that the switch module 15 may also include other devices that can realize the switching function. For example, the switch module 15 may also include a PMOS tube, an NPN transistor, or a PNP transistor. When the switch module adopts the above devices, the connection relationship between the above devices and other components is also changed with the characteristics of the devices, which will not be repeated here.

[0095] It should be noted that the above-mentioned anti-dismantling alarm circuit embodiment and the above-mentioned wireless tracker embodiment belong to the same concept, and the specific implementation process is detailed in the wireless tracker embodiment, and the technical features in the wireless tracker embodiment are correspondingly applicable in the above-mentioned anti-dismantling alarm circuit embodiment, which will not be repeated here.

[0096] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0097] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless tracker, characterized in that: It includes an anti-disassembly alarm circuit and an alarm module which are electrically connected in sequence, wherein: The anti-disassembly alarm circuit includes a photosensitive sensor and a switch module which are electrically connected in sequence, wherein the photosensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is closely attached to the goods, and send a switch signal to the switch module when it is determined that the wireless tracker is disassembled; the switch module is used to conduct when receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module; The alarm module is used to issue a preset alarm when receiving an interrupt signal of the anti-disassembly alarm output by the switch module.

2. The wireless tracker according to claim 1, characterized in that: The photosensor is a photodiode, the anode of the photodiode is electrically connected to the reference voltage terminal, and the cathode of the photodiode is electrically connected to the switch module.

3. The wireless tracker according to claim 2, characterized in that: The anti-disassembly alarm circuit further includes a filter module, which is electrically connected to the output end of the photosensitive sensor and is used to filter the switch signal output by the photosensitive sensor.

4. The wireless tracker according to claim 3, characterized in that: The filtering module includes a first capacitor and a first resistor, wherein the first end of the first capacitor is connected to the first end of the first resistor and then electrically connected to the negative electrode of the photodiode, and the second end of the first capacitor is connected to the second end of the first resistor and then grounded.

5. The wireless tracker according to claim 2, characterized in that: The anti-disassembly alarm circuit further comprises a current limiting module, which is arranged between the photosensitive sensor and the switch module and is used to control the switching speed and stability of the switch module.

6. The wireless tracker according to claim 5, characterized in that: The current limiting module includes a second resistor, a first end of the second resistor is electrically connected to the cathode of the photosensitive diode, and a second end of the second resistor is electrically connected to the input end of the switch module.

7. The wireless tracker according to claim 6, characterized in that: The anti-disassembly alarm circuit further comprises a voltage dividing module, which is arranged between the photosensitive sensor and the switch module and is used for dividing the reference voltage.

8. The wireless tracker according to claim 7, characterized in that: The voltage divider module includes a second resistor and a third resistor, the first end of the second resistor is electrically connected to the negative electrode of the photosensitive diode, the second end of the second resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is grounded, and the connection end between the second end of the second resistor and the first end of the third resistor is electrically connected to the input end of the switch module as a voltage divider output end.

9. The wireless tracker according to claim 8, characterized in that: The switch module includes an NMOS tube, a gate of the NMOS tube is electrically connected to the connection end of the second resistor and the third resistor, a source of the NMOS tube is grounded, a drain of the NMOS tube is electrically connected to a reference voltage end, and the drain of the NMOS tube serves as an output end electrically connected to the alarm module to output an interrupt signal of an anti-dismantling alarm to the alarm module.

10. An anti-disassembly alarm circuit, characterized in that: Applied to a wireless tracker, the anti-tampering alarm circuit includes a photosensitive sensor and a switch module electrically connected in sequence, wherein: The light-sensitive sensor is used to determine whether the wireless tracker is disassembled by detecting light changes in real time when the wireless tracker is attached to the cargo, and to send a switch signal to the switch module when it is determined that the wireless tracker is disassembled; The switch module is used to be turned on upon receiving the switch signal sent by the photosensitive sensor, and output an interrupt signal of the anti-disassembly alarm to the alarm module.

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