A protection circuit and a vehicle-mounted mobile terminal

Abstract

The utility model discloses a protection circuit and vehicle mobile terminal. The protection circuit is applied to vehicle mobile terminal, specifically includes: anti -disassembly subassembly, microcontroller and switch subassembly. Anti -disassembly subassembly connects the first pin of microcontroller, and the second pin of microcontroller connects the control end of switch subassembly, and the first switch end of switch subassembly is used for connecting power supply, and the second switch end of switch subassembly connects the third pin of microcontroller. Anti -disassembly subassembly is used for producing anti -disassembly signal when vehicle mobile terminal is taken apart, and sends to microcontroller. Microcontroller is used for based on the anti -disassembly signal of receiving, and control switch subassembly switches to the closed state from the disconnected state, thereby, microcontroller obtains target voltage value through power supply. Make microcontroller self -destruction to thereby enhance vehicle mobile terminal security.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a protection circuit and a vehicle-mounted mobile terminal. Background Technology

[0002] As a key component of the vehicle-to-everything (V2X) system, in-vehicle mobile terminals are primarily used to communicate with the V2X system's backend system or with the V2X mobile client to provide services such as remote diagnostics, vehicle monitoring, and remote control. However, a number of security threats currently exist against in-vehicle mobile terminals, including but not limited to unauthorized disassembly or reuse. Improving the security of in-vehicle mobile terminals and preventing unauthorized disassembly or reuse has become a pressing technical problem to be solved. Utility Model Content

[0003] This utility model provides a protection circuit and a vehicle-mounted mobile terminal, which can improve the security of the vehicle-mounted mobile terminal and prevent illegal disassembly or reuse.

[0004] The present invention discloses the following technical solutions: In a first aspect, this utility model provides a protection circuit for use in a vehicle-mounted mobile terminal. The protection circuit includes: an anti-tamper component, a microcontroller, and a switching component. The tamper protection component is connected to the first pin of the microcontroller, the second pin of the microcontroller is connected to the control terminal of the switch component, the first switching terminal of the switch component is used to connect to the power supply, and the second switching terminal of the switch component is connected to the third pin of the microcontroller. The tamper-proof component is used to generate an tamper-proof signal when the vehicle-mounted mobile terminal is disassembled, and sends the tamper-proof signal to the microcontroller; the microcontroller is used to control the switch component to switch from the open state to the closed state based on the received tamper-proof signal; when the switch component is in the closed state, the target voltage value is obtained through the power supply, and the target voltage value represents the voltage value that causes the microcontroller to self-destruct.

[0005] Optionally, the protection circuit further includes a boost circuit, the first switching terminal of the switching assembly is connected to the output terminal of the boost circuit, the input terminal of the boost circuit is used to connect to the power supply, and the enable terminal of the boost circuit is connected to the fourth pin of the microcontroller. The microcontroller is also configured to: send a control signal to the boost circuit based on the received anti-tamper signal; The boost circuit is used to: obtain the initial voltage value provided by the power supply, and adjust the initial voltage value to the target voltage value based on the control signal.

[0006] Optionally, the switching assembly includes a first switching assembly and a second switching assembly; The control terminal of the first switch assembly is connected to the second pin of the microcontroller, the first switch terminal of the first switch assembly is grounded, and the second switch terminal of the first switch assembly is connected to the control terminal of the second switch assembly. The first switch terminal of the second switch assembly is used to connect to the output terminal of the boost circuit, and the second switch terminal of the second switch assembly is connected to the third pin of the microcontroller.

[0007] Optionally, the protection circuit further includes a first resistor, and the second pin of the microcontroller is connected to the control terminal of the first switching assembly through the first resistor; The protection circuit also includes a second resistor, and the second switch terminal of the first switch assembly is connected to the control terminal of the second switch assembly through the second resistor.

[0008] Optionally, the protection circuit further includes a communication component, and the communication interface of the microcontroller is communicatively connected to the communication component; The communication component is used to send a self-destruct prohibition command to the microcontroller, and the microcontroller is also used to shut down the first pin according to the self-destruct prohibition command to reject the tamper signal of the tamper-proof component; The microcontroller is also used for: If the self-destruct prohibition command is not received, and the tamper protection signal is received, the switch assembly is controlled to switch from the open state to the closed state; if the self-destruct prohibition command is received, or the tamper protection signal is not received, the switch assembly is controlled to remain in the open state.

[0009] Optionally, the communication component is used to send a self-destruct command to the microcontroller, and the microcontroller is also used to control the switching component to switch to a closed state according to the self-destruct command and to send the control signal to the boost circuit, so as to remotely control the self-destruction of the microcontroller through the communication component.

[0010] Optionally, the first switching assembly includes either a current-controlled device or a voltage-controlled device, and the second switching assembly includes either a current-controlled device or a voltage-controlled device.

[0011] Optionally, the first switching component is an NPN transistor, and the second switching component is a PNP transistor; The control terminal of the first switching assembly is the base of the NPN transistor, the first switching terminal of the first switching assembly is the emitter of the NPN transistor, and the second switching terminal of the first switching assembly is the collector of the NPN transistor. The control terminal of the second switching assembly is the base of the PNP transistor, the first switching terminal of the second switching assembly is the emitter of the PNP transistor, and the second switching terminal of the second switching assembly is the collector of the PNP transistor.

[0012] Optionally, the anti-tamper component is an anti-tamper switch, the first switch terminal of the anti-tamper switch is used to connect to the power supply, and the second switch terminal of the anti-tamper switch is connected to the first pin of the microcontroller; the anti-tamper signal is the initial voltage value provided by the power supply, and the anti-tamper switch is in the normally open state when the vehicle mobile terminal is not disassembled.

[0013] Secondly, this utility model provides a vehicle-mounted mobile terminal, the system including the protection circuit and power supply as described in any one of the first aspects, one end of the protection circuit being connected to the power supply.

[0014] This invention provides a protection circuit and an in-vehicle mobile terminal. The protection circuit includes an anti-tamper component, a microcontroller, and a switching component. The anti-tamper component is connected to a first pin of the microcontroller, a second pin of the microcontroller is connected to the control terminal of the switching component, a first switching terminal of the switching component is connected to a power supply, and a second switching terminal of the switching component is connected to a third pin of the microcontroller. The anti-tamper component generates an anti-tamper signal when the in-vehicle mobile terminal is disassembled and sends it to the microcontroller. Based on the received anti-tamper signal, the microcontroller controls the switching component to switch from an open state to a closed state. Thus, the microcontroller can obtain a target voltage value from the power supply, causing it to self-destruct, and the in-vehicle mobile terminal will not function properly. This enhances the security of the in-vehicle mobile terminal and prevents illegal disassembly or reuse. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1A This invention provides a schematic diagram of the structure of a protection circuit according to an embodiment of the present invention. Figure 1B A schematic diagram of another protection circuit provided in an embodiment of this utility model; Figure 2 A schematic diagram of another protection circuit provided in an embodiment of this utility model; Figure 3 A schematic diagram of another protection circuit provided in this embodiment of the utility model; Figure 4 A schematic diagram of another protection circuit provided in this embodiment of the utility model; Figure 5 A schematic diagram of another protection circuit provided in this embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the vehicle-mounted mobile terminal described in an embodiment of the present utility model. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] As mentioned above, in-vehicle mobile terminals are a major component of vehicle-to-everything (V2X) systems. They are primarily used to communicate with the V2X system's backend system or with its mobile clients (such as smartphones) to provide functions such as remote diagnostics, vehicle monitoring, and remote vehicle control.

[0019] However, current security threats to in-vehicle mobile terminals exist, such as the illegal disassembly of these terminals. For example, criminals may obtain in-vehicle mobile terminals through illegal means and physically disassemble and modify their software, thereby compromising their security mechanisms. Another example is the reuse of in-vehicle mobile terminals, such as disassembling the device casing without the original manufacturer's permission to replace hardware or update software, leading to performance degradation or even malfunction.

[0020] In view of this, this utility model embodiment provides a protection circuit for protecting a vehicle-mounted mobile terminal. The protection circuit includes an anti-tamper component, a microcontroller, and a switching component. The anti-tamper component is connected to a first pin of the microcontroller, a second pin of the microcontroller is connected to the control terminal of the switching component, a first switching terminal of the switching component is connected to a power supply, and a second switching terminal of the switching component is connected to a third pin of the microcontroller. The anti-tamper component generates an anti-tamper signal when the vehicle-mounted mobile terminal is disassembled and sends it to the microcontroller. Based on the received anti-tamper signal, the microcontroller controls the switching component to switch from an open state to a closed state. Thus, the microcontroller can obtain a target voltage value from the power supply, causing the microcontroller to self-destruct, rendering the vehicle-mounted mobile terminal unusable, thereby enhancing the security of the vehicle-mounted mobile terminal and preventing illegal disassembly or reuse.

[0021] First, the professional data involved in the embodiments of this utility model will be introduced.

[0022] Microcontroller: Also known as a microcontroller unit (MCU), it is the core control unit of an in-vehicle mobile terminal. The microcontroller is responsible for receiving and processing data from various sensors and electronic control units in the vehicle, while coordinating and controlling the operation of various modules within the in-vehicle mobile terminal to ensure its stable operation.

[0023] In this embodiment of the invention, the microcontroller includes at least a first pin, a second pin, and a third pin. The second pin, also known as the recovery pin or Reset pin, is used to receive voltage from an external power supply to control the operation of the microcontroller's internal circuitry. For example, it can receive a preset high voltage (e.g., 12V or higher) from the power supply, causing the microcontroller's internal circuitry to be blown and burned out.

[0024] The microcontroller self-destruct indicator triggers a preset high voltage on the microcontroller. At this point, the internal circuitry is blown and burned out, causing the microcontroller to completely fail and become unusable. Microcontroller self-destruction will render the vehicle-mounted mobile terminal inoperable, resulting in loss of data acquisition and processing capabilities, paralysis of module coordination and control functions, and a complete collapse of security measures.

[0025] Therefore, this utility model embodiment uses a microcontroller self-destruct mechanism to prevent unauthorized disassembly and reuse of the vehicle-mounted mobile terminal, thereby enhancing the security of the vehicle-mounted mobile terminal and preventing illegal disassembly or reuse.

[0026] The protection circuit provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Appendix Figure 1A This is a schematic diagram of a protection circuit provided in an embodiment of the present invention. Figure 1A As shown, the protection circuit 100 includes: an anti-tamper component 101, a microcontroller 102, and a switch component 103.

[0028] The tamper-proof component 101 is connected to the first pin of the microcontroller 102, the second pin of the microcontroller 102 is connected to the control terminal of the switch component 103, the first switch terminal of the switch component 103 is used to connect to the power supply 104, and the second switch terminal of the switch component 103 is connected to the third pin of the microcontroller 102.

[0029] The anti-tamper component 101 is used to generate an anti-tamper signal when the vehicle-mounted mobile terminal is disassembled, and to send the anti-tamper signal to the microcontroller 102.

[0030] In this embodiment of the invention, the anti-tamper component can be a contact component, such as a spring or an anti-tamper switch, which uses the principle of mechanical contacts to detect the casing of the vehicle-mounted mobile terminal. For example, the anti-tamper component is a spring, with a strain gauge sensor at its end. The vehicle-mounted mobile terminal is a vehicle-mounted communication device (Telematics Box, T-BOX). When the T-BOX device is not disassembled, the spring is in a compressed state, and the end of the spring is in contact with the casing of the T-BOX device. The strain gauge sensor at the end of the spring generates a first voltage signal, which is sent to the microcontroller. When the T-BOX device is disassembled, the T-BOX device sends displacement, the spring loses its compressive force, and the strain gauge sensor of the spring module generates a second voltage signal, which is sent to the microcontroller 102. The microcontroller 102 uses the received second voltage signal as the anti-tamper signal.

[0031] For example, the tamper-proof component is a tamper switch. The first pin of the microcontroller is connected to the power supply through the tamper switch. When the T-BOX device is not disassembled, the tamper switch is open. When the T-BOX device is disassembled, the tamper switch closes. At this time, the microcontroller receives a high-level signal from the backup power supply, and the microcontroller uses the high-level signal as the tamper-proof signal.

[0032] The tamper-proof component can also be a non-contact component, such as a photoelectric sensor or a magnetic induction sensor, etc., and this embodiment of the present invention is not specifically limited. For example, the tamper-proof component is a fiber optic sensor. For instance, a fiber optic sensor is installed on the T-BOX shell. When the T-BOX shell is opened, the stress on the fiber changes, and the optical signal transmission characteristics in the fiber change. At this time, the tamper-proof signal is the transmission characteristics of the changed optical signal.

[0033] The microcontroller 102 is used to control the switch assembly 103 to switch from an open state to a closed state based on an anti-tamper signal. When the switch assembly 103 is in the closed state, the microcontroller 102 can obtain a target voltage value through the power supply, the target voltage value representing the voltage value that causes the microcontroller 102 to self-destruct.

[0034] In this embodiment of the invention, the switching component 103 can be a voltage-controlled device, such as a P-channel metal-oxide-semiconductor field-effect transistor (PMOS) or an N-channel metal-oxide-semiconductor field-effect transistor (NMOS). In this case, the control terminal of the switching component 103 is the gate of the MOS transistor, the first switching terminal of the switching component 103 is the source of the MOS transistor, and the second switching terminal of the switching component 103 is the drain of the MOS transistor. The microcontroller 102 can control the voltage at the gate of the switching component to control the conduction between the source and drain of the switching component, thereby obtaining the target voltage value through the power supply.

[0035] The switching component 103 can also be a current-controlled device, such as a transistor. In this case, the control terminal of the switching component 103 is the base of the transistor, the first switching terminal of the switching component 103 is the emitter of the transistor, and the second switching terminal of the switching component 103 is the collector of the transistor. In this case, the microcontroller 102 controls the conduction state between the collector and emitter by controlling the base current of the transistor, thereby enabling the microcontroller 102 to obtain the target voltage value through the power supply. This embodiment of the invention is not specifically limited.

[0036] The target voltage value represents the voltage value that causes the microcontroller 102 to self-destruct. For example, if the target voltage value is 12V, the microcontroller can self-destruct when it receives 12V. Specifically, the internal circuitry of the microcontroller is burned out, thus improving the safety of the vehicle-mounted mobile terminal from a hardware perspective.

[0037] The power supply is used to generate the target voltage value. In this embodiment of the invention, the power supply can be a voltage source that directly generates the target voltage value.

[0038] In addition, the power supply can also be a voltage source that indirectly generates the target voltage value. For example, if the power supply generates an initial voltage value that is lower than the target voltage value, the power supply can boost the voltage through a boost circuit to adjust the initial voltage value to the target voltage value and output it to the microcontroller 102.

[0039] For example, the protection circuit also includes a boost circuit, specifically a direct current-to-direct current (DC-DC) circuit. The DC-DC circuit is used to convert the initial supply voltage provided by the power supply to a target voltage value, causing the microcontroller 102 to self-destruct. The target voltage value is higher than the initial supply voltage.

[0040] For example, Appendix Figure 1B This is a schematic diagram of another protection circuit provided in an embodiment of the present invention. The protection circuit 100 also includes a boost circuit 105.

[0041] The enable (EN) terminal of the boost circuit 105 is connected to the fourth pin of the microcontroller 102. The input terminal of the boost circuit 105 is connected to the power supply 104, and the output terminal is connected to the first switch terminal of the switching assembly 103. The microcontroller 102 is used to: receive an anti-tamper signal through the first pin and then send a control signal to the boost circuit 105. The boost circuit 105 is used to obtain the initial voltage value provided by the power supply and, based on the control signal, adjust the initial voltage value to the target voltage value.

[0042] Specifically, when the microcontroller 102 outputs a high level through its fourth pin, the boost circuit 105 operates normally, converting the initial voltage value provided by the power supply 104 into the target voltage value. When the microcontroller 102 outputs a low level through its fourth pin, the boost circuit 105 does not operate, and the microcontroller 102 cannot obtain the target voltage value.

[0043] In summary, in the protection circuit of this utility model embodiment, the anti-tampering component responds immediately when it detects that the vehicle-mounted mobile terminal has been disassembled, triggering the microcontroller control switch component to switch from the open state to the closed state, obtaining the target voltage that causes the microcontroller to self-destruct, thereby enhancing the security of the vehicle-mounted mobile terminal and preventing illegal disassembly or reuse.

[0044] Furthermore, when the switching component 103 is a voltage-type controller or a current-type controller, since the voltage value (hereinafter referred to as the first voltage value) provided by the microcontroller 102 to the switching component is relatively low, while the voltage value provided to the microcontroller 102 for self-destruction, i.e., the target voltage value (hereinafter referred to as the second voltage value), is generally higher, i.e., the second voltage value is greater than the first voltage value, in order to ensure the normal operation of the switching component, the switching component provided in this embodiment of the present invention includes multiple switching components. The multiple switching components are two or more switching components. The multiple switching components include switching components of different types. For ease of explanation, the following description uses the example of multiple switching components specifically including a first switching component and a second switching component for illustrative purposes.

[0045] Appendix Figure 2 This is a schematic diagram of another protection circuit provided in an embodiment of the present utility model. The protection circuit 100 includes: an anti-tamper component 101, a microcontroller 102, a boost circuit 105, a first switch component 201, and a second switch component 202.

[0046] The connection relationship between the tamper-proof component 101 and the microcontroller 102, as well as the functions of the tamper-proof component and the microcontroller, are shown in Figure 1 and will not be repeated here.

[0047] The second pin of microcontroller 102 is connected to the control terminal of the first switching component 201. The first switching terminal of the first switching component 201 is connected to ground. The second switching terminal of the first switching component 201 is connected to the control terminal of the second switching component 202. The first switching terminal of the second switching component 202 is used to connect to the enable terminal of the boost circuit 105. The second switching terminal of the second switching component 202 is connected to the third pin of microcontroller 102. In this embodiment of the invention, when the first switching component 201 is in the closed state and the second switching component 202 is in the closed state, the power supply can provide a target voltage value through the boost circuit 105. This target voltage value is output to the internal circuit of microcontroller 102 through the third pin of microcontroller 102, so that microcontroller 102 self-destructs.

[0048] Exemplary examples show that the first switching component and the second switching component can both be current-controlled devices, or both can be voltage-controlled devices, or the first switching component can be a current-controlled device and the second switching component a voltage-controlled device, or vice versa. This embodiment of the present invention is not specifically limited. The following illustrative example illustrates the use of a first switching component that is a current-controlled device, specifically an NPN transistor, and a second switching component that is a current-controlled device, specifically a PNP transistor.

[0049] For example, Appendix Figure 3 This is a schematic diagram of another protection circuit provided in an embodiment of the present invention. In this protection circuit 100, the first switching component 201 is an NPN transistor Q2, and the second switching component 202 is a PNP transistor Q1.

[0050] The protection circuit 300 also includes a first resistor R1 and a second resistor R2. The second pin of the microcontroller 102 is connected to the base of the NPN transistor Q2 via the first resistor R1. The emitter of the NPN transistor Q2 is grounded. The emitter of the NPN transistor Q2 is connected to the base of the PNP transistor Q1, and to the emitter of the PNP transistor Q1 via the second resistor R2. The emitter of the PNP transistor Q1 is also used to connect to the power supply. The collector of the PNP transistor Q1 is connected to the third pin of the microcontroller 102.

[0051] The first resistor R1 limits the current to prevent excessive base current from damaging the NPN transistor Q2 when the microcontroller 102 outputs a high level. The second resistor R2 ensures that the PNP transistor Q1 is cut off when the NPN transistor Q2 is cut off, thus ensuring the circuit is in the correct initial state.

[0052] In this embodiment of the present invention, the microcontroller 102 inputs a high level through the second pin. At this time, the NPN transistor Q2 is turned on, and the base of the NPN transistor Q2 is at a low level. At this time, the PNP transistor Q1 is turned on, so that the power supply is connected to the third pin of the microcontroller. The power supply is used to provide the microcontroller 102 with a target voltage value, and the microcontroller self-destructs through the target voltage value.

[0053] When the microcontroller 102 outputs a low level through its second pin, the NPN transistor Q2 and the PNP transistor Q1 are cut off, thus disconnecting the power supply from the microcontroller's third pin. At this time, the microcontroller 102 will not receive the target voltage value and will not self-destruct.

[0054] In summary, in this embodiment of the invention, multiple switching components are different types of switching transistors. This approach can fully utilize the complementary characteristics of the conduction conditions of different switching transistors, enabling the microcontroller to control the conduction of the switching components with a lower voltage, thereby achieving stable logic control.

[0055] Furthermore, considering that disassembly of the vehicle-mounted mobile terminal may involve not only unauthorized personnel but also authorized personnel, such as factory employees or personnel permitted by the factory for maintenance, the microcontroller must be prevented from self-destructing when authorized personnel disassemble the vehicle-mounted mobile terminal. Therefore, this application provides another protection circuit that prevents the microcontroller from self-destructing when authorized personnel disassemble the vehicle-mounted mobile terminal.

[0056] Appendix Figure 4 This is a schematic diagram of another protection circuit provided in an embodiment of the present invention. The protection circuit 100 further includes a communication component 401. The communication component 401 is used for communication connection with the backend system of the vehicle networking system or with a mobile client.

[0057] In this embodiment of the invention, the microcontroller 102 is connected to the communication component 401 via a communication interface. Specifically, the communication component 401 is used to send a self-destruct prevention command to the microcontroller 102 via the communication interface.

[0058] In one example, a user can initiate a self-destruct prevention operation through the interactive interface of a mobile client. The mobile client can send the self-destruct prevention command corresponding to the self-destruct prevention operation to the communication component 401. The communication component 401 then sends the self-destruct prevention command to the microcontroller 102 through the communication interface.

[0059] In one example, microcontroller 102 is used to shut down the first pin according to a self-destruct prohibition instruction, at which point the microcontroller rejects the tamper signal of the tamper tamper component, thereby prohibiting microcontroller 102 from self-destructing.

[0060] For example, see [link to previous article] Figure 4 As shown, if microcontroller 102 receives a command to prevent self-destruction, it will continue to operate normally. The second pin of microcontroller 102 will always output a low level. At this time, NPN transistor Q2 will be cut off, and since the emitter and collector of PNP transistor Q1 are the same, PNP transistor Q1 will also be cut off. Microcontroller 102 will no longer receive the target voltage value provided by the power supply. This means that microcontroller 102 will no longer respond to the tamper signal sent by the tamper protection component 101. Therefore, even if the vehicle mobile terminal is turned on again, microcontroller 102 will not self-destruct.

[0061] If the microcontroller 102 does not receive a command to prevent self-destruction, the level output by the second pin of the microcontroller 102 is related to whether the first pin receives an anti-tamper signal. If an anti-tamper signal is received, the second pin of the microcontroller 102 outputs a high level. At this time, the NPN transistor Q2 is turned on and the PNP transistor Q1 is also turned on. At this time, the microcontroller 102 can receive the target voltage value provided by the power supply, thereby causing the microcontroller 102 to self-destruct.

[0062] In addition, the communication component 401 is also used to send a self-destruct command to the microcontroller 102 through the communication interface. After receiving the self-destruct command, the microcontroller 102 controls the switch component 103 to switch from the open state to the closed state through the second pin. The microcontroller 102 can obtain the target voltage value provided by the power supply through the second pin, thereby causing the microcontroller 102 to self-destruct.

[0063] For example, see [link to previous article] Figure 4 As shown, if a legitimate user sends a self-destruct command to the microcontroller 102 via the communication component 401, the microcontroller 102 outputs a voltage level to start the boost circuit 105 and simultaneously outputs a voltage level to start the switching component via the second pin, causing the microcontroller 102 to acquire the target voltage value and enter the self-destruct state. For example, the microcontroller 102 controls the second pin to output a high level, turning on both PNP transistor Q1 and NPN transistor Q2. The microcontroller 102 then acquires the target voltage value from the power supply, and the microcontroller 102 self-destructs.

[0064] It should be noted that the communication component provided in this embodiment of the present invention includes a communication module and an antenna. The communication module can be a 4G communication module, a 5G communication module, or other communication modules. This embodiment of the present invention does not specifically limit the type of communication module.

[0065] In summary, by adding a communication component to the protection circuit, this utility model embodiment allows authorized personnel to remotely control or disable the self-destruct function through the communication component.

[0066] For example, Appendix Figure 5 This is a schematic diagram of another protection circuit provided in an embodiment of the present invention. In this protection circuit 100, the first pin of the microcontroller 102 is the INT pin, the second pin is a General-Purpose Input / Output (GPIO) 1 pin, the third pin is the RESET pin, the fourth pin is the GPIO 0 pin, and the communication interface is a Universal Asynchronous Receiver / Transmitter (UART) interface. The power supply 104 is a backup battery 5, and the boost circuit 105 is specifically a DC-DC circuit 3.

[0067] The INT pin of microcontroller 102 is connected to the first terminal of backup battery 5 via tamper switch 4, and the second terminal of backup battery 5 is grounded. The first terminal of backup battery 5 is also connected to the input terminal of DC-DC circuit 3. The OUT terminal of DC-DC circuit is connected to the emitter of PNP transistor Q1, and the EN terminal of DC-DC circuit is connected to the GPIO0 pin of microcontroller 102.

[0068] The collector of PNP transistor Q1 is connected to the RESET pin of microcontroller 102. The emitter of PNP transistor Q1 is connected to the base of PNP transistor Q1 through a second resistor R2. The base of PNP transistor Q1 is connected to the collector of NPN transistor Q2, the emitter of NPN transistor Q2 is grounded, and the base of NPN transistor Q2 is connected to the GPIO1 pin of microcontroller 102 through a first resistor R1. The URAT interface of microcontroller 102 is connected to the communication component 501.

[0069] In this embodiment of the invention, when the casing of the vehicle-mounted mobile terminal device is opened, the anti-tamper switch 4 is activated, causing it to close. At this time, the INT pin of the microcontroller 102 conducts a high-level signal to the backup battery 5, which is the anti-tamper signal. The microcontroller 102 then activates its internal self-destruct program.

[0070] If the microcontroller 102 receives a self-destruct prohibition command sent by a legitimate user through the communication component 501, the microcontroller 102 initiates the self-destruct cancellation procedure. In one example, the communication component 501 writes the self-destruct prohibition command to the microcontroller 102 via the UART interface, allowing the microcontroller 102 to disable its INT pin and stop responding to tamper signals. In this case, opening the T-BOX enclosure will prevent the microcontroller 102 from entering self-destruct mode.

[0071] Furthermore, if the microcontroller 102 receives a signal from the communication component 501 via the UART interface indicating that it can execute an internal self-destruct program, the microcontroller 102, upon receiving the tamper-proof signal, can activate the internal self-destruct program. The internal self-destruct program specifically includes: The microcontroller 102 transmits unauthorized disassembly information to the backend system or a mobile client for recording via the communication component 501 through the UART interface. Simultaneously, the microcontroller 102 outputs a high level through the GPIO0 pin to activate the DC-DC circuit 3, which boosts the voltage provided by the backup battery 5 to a target voltage value, for example, if the backup battery 5 provides 3.6V and the target voltage value is 12V. The DC-DC circuit 3 outputs its output through the OUT terminal.

[0072] At this time, the microcontroller 102 outputs a high level through the GPIO1 pin, which turns on both the NPN transistor Q2 and the PNP transistor Q1. As a result, the target voltage value can be directly applied to the RESET pin of the microcontroller 102, which will melt and burn out the internal circuit of the RESET pin. The microcontroller 102 will fail, and the vehicle mobile terminal will not be able to work properly, thus achieving self-destruct protection.

[0073] Furthermore, after receiving the self-destruct command through the communication component, the microcontroller 102 sets the GPIO0 pin to output a high level, starting the DC-DC circuit 3; at the same time, it outputs a high level on the GPIO1 pin, and both the NPN transistor Q2 and the PNP transistor Q1 are in the conducting state. Thus, the target voltage value can be directly applied to the RESET pin of the microcontroller 102, causing the internal circuit of the RESET pin to melt and burn out, the microcontroller 102 to fail, and the vehicle mobile terminal to malfunction, thus realizing remote control self-destruction.

[0074] In summary, this embodiment of the invention allows for the introduction of a DC-DC circuit into the protection circuit, enabling the use of a backup battery as the power supply. This eliminates the need for additional power sources; the backup battery of the vehicle-mounted mobile terminal can be used to obtain the high voltage required for the self-destruct mechanism through a boost converter. Furthermore, this embodiment of the invention allows for control over the activation of the boost circuit, ensuring that it only activates when self-destruction is required, thus conserving power resources and reducing unnecessary losses.

[0075] Furthermore, this embodiment of the invention also provides a vehicle-mounted mobile terminal. The vehicle-mounted mobile terminal is, for example, a T-BOX.

[0076] Appendix Figure 6 This is a schematic diagram of the structure of the vehicle-mounted mobile terminal 600 according to an embodiment of the present invention. The vehicle-mounted mobile terminal 600 includes a protection circuit and a power supply 104. The protection circuit is described in detail above and will not be repeated here.

[0077] For detailed descriptions of each component, please refer to the above text, and they will not be repeated here.

[0078] In summary, the vehicle-mounted mobile terminal of this utility model embodiment has an anti-tamper component that responds immediately when it detects that the vehicle-mounted mobile terminal has been disassembled, triggering the microcontroller to control the switch component to close the switch component. At this time, the microcontroller obtains the target voltage that causes the microcontroller to self-destruct, thereby enhancing the security of the vehicle-mounted mobile terminal and preventing it from being illegally disassembled or reused.

[0079] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0080] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection circuit, characterized in that, The protection circuit, applied to vehicle-mounted mobile terminals, includes: an anti-tamper component, a microcontroller, and a switching component. The anti-tamper component is connected to the first pin of the microcontroller, the second pin of the microcontroller is connected to the control terminal of the switch component, the first switch terminal of the switch component is used to connect to the power supply, and the second switch terminal of the switch component is connected to the third pin of the microcontroller. The anti-tamper component is used to: generate an anti-tamper signal when the vehicle-mounted mobile terminal is disassembled, and send the anti-tamper signal to the microcontroller; The microcontroller is used to: control the switch assembly to switch from an open state to a closed state based on the received anti-tamper signal; when the switch assembly is in the closed state, the microcontroller obtains a target voltage value through the power supply; the target voltage value represents the voltage value that causes the microcontroller to self-destruct; the protection circuit further includes a boost circuit, the first switching terminal of the switch assembly is connected to the output terminal of the boost circuit, the input terminal of the boost circuit is used to connect to the power supply, and the enable terminal of the boost circuit is connected to the fourth pin of the microcontroller; The microcontroller is also configured to: send a control signal to the boost circuit based on the received anti-tamper signal; The boost circuit is used to: obtain the initial voltage value provided by the power supply, and adjust the initial voltage value to the target voltage value based on the control signal.

2. The protection circuit according to claim 1, characterized in that, The switching assembly includes a first switching assembly and a second switching assembly; The control terminal of the first switch assembly is connected to the second pin of the microcontroller, the first switch terminal of the first switch assembly is grounded, and the second switch terminal of the first switch assembly is connected to the control terminal of the second switch assembly. The first switch terminal of the second switch assembly is used to connect to the output terminal of the boost circuit, and the second switch terminal of the second switch assembly is connected to the third pin of the microcontroller.

3. The protection circuit according to claim 2, characterized in that, The protection circuit also includes a first resistor, and the second pin of the microcontroller is connected to the control terminal of the first switching assembly through the first resistor. The protection circuit also includes a second resistor, and the second switch terminal of the first switch assembly is connected to the control terminal of the second switch assembly through the second resistor.

4. The protection circuit according to claim 1, characterized in that, The protection circuit also includes a communication component, and the communication interface of the microcontroller is communicatively connected to the communication component; The communication component is used to send a self-destruct prohibition command to the microcontroller, and the microcontroller is also used to shut down the first pin according to the self-destruct prohibition command to reject the tamper signal of the tamper-proof component; The microcontroller is also used for: If the self-destruct prohibition command is not received, and the tamper protection signal is received, the switch assembly is controlled to switch from the open state to the closed state; If the self-destruct prohibition command is received, or if the tamper protection signal is not received, the switch assembly is controlled to be in the off state.

5. The protection circuit according to claim 4, characterized in that, The communication component is used to send a self-destruct command to the microcontroller. The microcontroller is also used to control the switching component to switch to the closed state according to the self-destruct command and to send the control signal to the boost circuit, so as to remotely control the self-destruction of the microcontroller through the communication component.

6. The protection circuit according to claim 2, characterized in that, The first switching assembly includes either a current-controlled device or a voltage-controlled device, and the second switching assembly includes either a current-controlled device or a voltage-controlled device.

7. The protection circuit according to claim 2, characterized in that, The first switching component is an NPN transistor, and the second switching component is a PNP transistor; The control terminal of the first switching assembly is the base of the NPN transistor, the first switching terminal of the first switching assembly is the emitter of the NPN transistor, and the second switching terminal of the first switching assembly is the collector of the NPN transistor. The control terminal of the second switching assembly is the base of the PNP transistor, the first switching terminal of the second switching assembly is the emitter of the PNP transistor, and the second switching terminal of the second switching assembly is the collector of the PNP transistor.

8. The protection circuit according to any one of claims 1-6, characterized in that, The anti-tamper component is an anti-tamper switch. The first switch terminal of the anti-tamper switch is used to connect to the power supply, and the second switch terminal of the anti-tamper switch is connected to the first pin of the microcontroller. The anti-tamper signal is the initial voltage value provided by the power supply. When the vehicle-mounted mobile terminal is not disassembled, the anti-tamper switch is in the normally open state.

9. A vehicle-mounted mobile terminal, characterized in that, It includes a protection circuit and a power supply as described in any one of claims 1-8, wherein one end of the protection circuit is connected to the power supply.

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