An improved lithium battery GPS anti-theft system and control method thereof

Abstract

The present invention provides an improved lithium battery GPS anti-theft and disassembly system and a control method thereof, wherein the system structure includes a GPS system, a lithium battery system, a lithium battery protection system, and a power output module, wherein the negative electrode line in the GPS system is connected to the lithium battery protection system, the lithium battery system transmits the lithium battery status to the lithium battery protection system, the lithium battery protection system is used to judge the online status of the negative electrode of the GPS system and output an output control signal to the power output module, and the power output module can control the power supply of the lithium battery to the load and the charger according to the control signal. The present invention only judges whether the GPS is stolen through the negative electrode detection line, and has a simple structure. When all GPS signals are lost, it will not affect the normal output of the lithium battery protection system. Therefore, the scheme of the present invention can not only ensure the stability of the system when the GPS is online, but also ensure the stability of the power output of the lithium battery protection system.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic circuits, relates to a lithium battery anti-theft and disassembly technology, and in particular to an improved lithium battery GPS anti-theft and disassembly system and a control method thereof. Background Art

[0002] The existing lithium battery anti-theft and disassembly technology usually uses the communication signal of GPS as the main signal of the lithium battery protection system. The principle is to continuously send communication instructions to the lithium battery protection system through GPS, so that the lithium battery protection system continuously monitors whether the GPS is online and monitors whether it is outputting normally. This anti-theft control that continuously communicates through GPS still has defects. Since GPS itself is a positioning system, during use, due to signal interference, the GPS communication fails or stops sending, which will cause the lithium battery protection system to misjudge, resulting in disconnection of output, etc. If this system is used in a vehicle, when the vehicle is driving at high speed, it is easy to cause a safety accident in serious cases. Summary of the invention

[0003] In order to overcome the problem of frequent communication failure between GPS and lithium battery protection system in the prior art, the present invention provides an improved lithium battery GPS anti-theft and disassembly system and its control method, wherein a negative electrode detection line is installed in the internal control of GPS and connected to the lithium battery protection system, and the power output control of the lithium battery protection system uses the negative electrode detection line inside the GPS as a reference. When the GPS is forcibly disassembled or falls off due to aging, the switch control in the lithium battery protection system will be triggered, causing the entire system to cut off power output, so that the power output will not be affected by problems such as GPS signal interference.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] An improved lithium battery GPS anti-theft and disassembly system comprises a GPS system, a lithium battery system, a lithium battery protection system and a power output module. The negative electrode line in the GPS system is connected to the lithium battery protection system, the lithium battery system transmits the lithium battery status to the lithium battery protection system, the lithium battery protection system is used to judge the online status of the negative electrode of the GPS system and output a control signal to the power output module, and the power output module can control the on-off of the power supply of the lithium battery to the load and the charger according to the control signal.

[0006] Furthermore, the lithium battery protection system includes a 4-wire separate interface, a first current limiting control resistor, a second current limiting control resistor, an anti-disassembly control switch tube, a third current limiting resistor, and a reverse protection diode; the negative line of the GPS system is connected to one of the ports of the 4-wire separate interface, and the third current limiting resistor is connected to the other port of the 4-wire separate interface; the third current limiting resistor is connected to the negative electrode of the reverse protection diode, and the positive electrode of the reverse protection diode is connected between the first current limiting resistor and the second current limiting resistor; the external chip power supply signal is connected to the first current limiting resistor, and the external chip power supply signal is used to control the anti-disassembly control switch tube through the first and second current limiting resistors to form a drive circuit; the anti-disassembly control switch tube source is grounded, the gate is connected between the first and second current limiting resistors, and the drain outputs an IO signal as an anti-disassembly control signal.

[0007] Furthermore, of the remaining two ports in the 4-wire separation interface, one is grounded, and the other port is connected to an external lithium battery power supply signal and a power pull-up signal.

[0008] The present invention also provides a control method for an improved lithium battery GPS anti-theft and disassembly system, comprising the following steps:

[0009] When the system starts working, the lithium battery protection system determines whether the GPS system is online based on the feedback information from the GPS system and the lithium battery system. When the lithium battery protection system detects that the negative line of the GPS system is online, the lithium battery protection system opens the power output switch tube through the drive circuit to maintain the battery power output; when the negative line of the GPS system is not online, the lithium battery protection system determines that the negative line of the GPS system is not online, the lithium battery protection system makes the power output switch tube suspend through the drive circuit, and the lithium battery protection system disconnects the battery power output.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0011] Only the negative pole detection line is used to determine whether the GPS is stolen. The structure is simple. When all GPS signals are lost, the normal output of the lithium battery protection system will not be affected. Therefore, the solution of the present invention can not only ensure the stability of the system when the GPS is online, but also ensure the stability of the power output of the lithium battery protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of the improved lithium battery GPS anti-theft and disassembly system provided by the present invention.

[0013] Figure 2 This is a control flow chart of the present invention.

[0014] Figure 3 It is the hardware logic diagram of the present invention. DETAILED DESCRIPTION

[0015] The technical solution provided by the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the following specific implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0016] like Figure 1 As shown, the lithium battery anti-theft and disassembly system includes: a GPS system, a lithium battery system, a lithium battery protection system, and a power output module, wherein the lithium battery protection system is connected to the GPS system, the lithium battery, and the power output module. The GPS system and the lithium battery simultaneously send signals to the lithium battery protection system. The lithium battery protection system is connected to the lithium battery sampling control to detect the status of the lithium battery. The lithium battery protection system receives the data signal and the negative electrode signal sent by the GPS system. The power output module receives the control signal and the drive signal output by the lithium battery protection system. The power output module can control the power on and off of the lithium battery output to the load and the charger. The power output module is welded to the integrated mainboard of the lithium battery protection system to reduce the volume. The GPS system, the lithium battery system, and the power output module are all prior art, and their specific structures are no longer repeated in the present invention. The present invention adds a lithium battery protection system connected to the negative electrode line of the GPS system on the basis of the prior art.

[0017] The circuit structure of the lithium battery protection system is as follows Figure 3 As shown, it includes a first current limiting control resistor R60, a second current limiting control resistor R66, an anti-disassembly control MOS tube Q11, a reverse protection diode D24, a third current limiting resistor R63, and a 4-wire separation interface STM2.0*4P. The GPS system is connected to the lithium battery protection system through a 4-wire separation interface STM2.0*4P. Among the 4 ports, the ACC signal detection terminal (port 2) is connected to the negative line of the GPS system to detect whether the negative line is online, port 1 is grounded, port 2 is connected to the third current limiting resistor R63, and port 4 is connected to the signal B+ as an external lithium battery power supply signal and a power pull-up signal. The third current limiting resistor R63 is connected to the negative pole of the reverse protection diode D24. The positive pole of the reverse protection diode D24 is connected between the first current limiting resistor R60 and the second current limiting resistor R66. The third current limiting resistor R63 and the reverse protection diode D24 form a signal protection circuit to prevent the external GPS system from high-voltage reverse charging, which causes the anti-disassembly control MOS tube to break down. V11 is an external 11V chip power supply signal, which is connected to the first current limiting resistor R60, the first current limiting resistor R60 is connected in series with the second current limiting resistor R66, the second current limiting resistor R66 is grounded, and V11 forms an 8V drive circuit through the first and second current limiting resistors to control the anti-disassembly control MOS tube Q11. The source of the anti-disassembly control MOS tube Q11 is grounded, the gate is connected between the first and second current limiting resistors, and the drain outputs the IO signal as the anti-disassembly control signal. The IO signal is connected to the charger and the load. Q11 uses an NMOS tube.

[0018] The overall working principle of the present invention is as follows Figure 2 As shown in the figure: when the lithium battery anti-theft system starts working, the lithium battery protection system determines whether the GPS system is online based on the feedback information from the GPS system and the lithium battery system. When the lithium battery protection system detects that the negative line of the GPS system is online, the lithium battery protection system turns on the switch control tube Q11, and the lithium battery protection system maintains the battery power output. If the GPS system is forcibly dismantled or stolen, for example, the GPS falls off, the negative pole is not online, the ACC port status is suspended, and the D24 diode has no voltage in the forward direction. V11 drives NMOSQ11 to open through the current limiting resistors R60 and R66, and the IO signal changes from high level to low level. When the GPS is online, the 4-wire separation interface is connected normally, the negative pole is online, the ACC port status is low level, and the D24 diode has a forward voltage. The resistors R60 and R66 drive the NMOSQ11 to suspend, and the IO signal is always at a high level. When the lithium battery protection system determines that the negative line of the GPS system is not online, the lithium battery protection system disconnects the battery power output. The anti-tampering control MOS tube Q11 is directly controlled by external hardware logic, without the need for software mechanism control such as MCU.

[0019] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. An improved lithium battery GPS anti-theft system, characterized in that: It includes a GPS system, a lithium battery system, a lithium battery protection system, and a power output module. The negative electrode line in the GPS system is connected to the lithium battery protection system, and the lithium battery system transmits the lithium battery status to the lithium battery protection system. The lithium battery protection system is used to judge the online status of the negative electrode of the GPS system and output a control signal to the power output module. According to the control signal, the power output module can control the on and off of the power supply of the lithium battery to the load and the charger; the lithium battery protection system includes a 4-wire separation interface, a first current limiting control resistor, a second current limiting control resistor, an anti-disassembly control switch tube, and a third current limiting resistor. The power output module includes a reverse protection diode; the negative electrode line of the GPS system is connected to one of the ports of the 4-wire separation interface, and the third current limiting resistor is connected to the other port of the 4-wire separation interface; the third current limiting resistor is connected to the negative electrode of the reverse protection diode, and the positive electrode of the reverse protection diode is connected between the first current limiting resistor and the second current limiting resistor; the external chip power supply signal is connected to the first current limiting resistor, and the external chip power supply signal forms a driving circuit through the first and second current limiting resistors to control the anti-disassembly control switch tube; The source of the anti-disassembly control switch tube is grounded, the gate is connected between the first and second current limiting resistors, and the drain outputs an IO signal which is an anti-disassembly control signal.

2. The improved lithium battery GPS anti-theft and disassembly system according to claim 1 is characterized in that: Of the remaining two ports in the 4-wire separation interface, one is grounded, and the other is connected to an external lithium battery power supply signal and a power pull-up signal.

3. A control method for an improved lithium battery GPS anti-theft and disassembly system, based on the improved lithium battery GPS anti-theft and disassembly system according to any one of claims 1 or 2, comprises the following steps: When the system starts working, the lithium battery protection system determines whether the GPS system is online based on the feedback information from the GPS system and the lithium battery system. When the lithium battery protection system detects that the negative line of the GPS system is online, the lithium battery protection system opens the power output switch tube through the drive circuit to maintain the battery power output; when the negative line of the GPS system is not online, the lithium battery protection system determines that the negative line of the GPS system is not online, the lithium battery protection system makes the power output switch tube suspend through the drive circuit, and the lithium battery protection system disconnects the battery power output.

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