Temporary warning device for highway accidents

By designing a temporary road accident warning device with automatic light-emitting and reflective strips, the problem of difficulty in identification of existing equipment in rainy and foggy weather has been solved, enabling timely retrieval and return at the roadside and reducing the occurrence of secondary traffic accidents.

CN224243728UActive Publication Date: 2026-05-15CHINA METALLURGICAL CONSTR ENG GRP
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Patent Information

Application Number
CN202521108904.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2026-05-15
Estimated Expiration
2035-05-30

AI Technical Summary

Technical Problem

Existing temporary warning devices are difficult to identify effectively in rainy or foggy weather and are easily lost, leading to secondary traffic accidents.

Method used

A temporary warning device for highway accidents has been designed, including a base and a detachable temporary warning device. It has the functions of automatic light-emitting active warning and reflective strip passive warning. It is powered by solar energy and uses an intelligent locking mechanism to ensure the timely retrieval and return of the device.

Benefits of technology

It enhances the warning effect in rainy and foggy weather, reduces the probability of secondary traffic accidents caused by vehicle malfunctions, and ensures that the equipment is not easily lost.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model provides a highway accident temporary warning device which comprises a base and a temporary warning indicator, the temporary warning indicator is detachably connected with the base, and the base is fixed to a set position beside a highway. The temporary warning indicator comprises a warning indicator shell and an active warning unit arranged in the warning indicator shell; the active warning unit comprises a warning lamp LED, a lithium battery, a lithium battery charging circuit and a lithium battery power supply control circuit, the input end of the warning lamp LED is connected to the output end of the lithium battery power supply control circuit, and the input end of the lithium battery power supply control circuit is connected to the positive electrode of the lithium battery; the lithium battery charging circuit is used for managing charging of the lithium battery; the warning indicator shell is provided with a light-transmitting window, and the light-transmitting window is sealed by a transparent material; a reflective tape is arranged on the outer side wall of the warning indicator shell.
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Description

Technical Field

[0001] This utility model relates to a road warning device, and more particularly to a temporary warning device for highway accidents. Background Technology

[0002] When a vehicle is involved in an accident on the road and cannot continue to be driven, it must be parked on the side of the road and a temporary warning device must be placed at a prescribed safe distance behind the vehicle to warn following vehicles and prevent secondary traffic accidents.

[0003] In the existing technology, temporary warning devices for vehicles generally use warning triangles. However, existing warning triangles are generally small in size to save vehicle space, and are often difficult to be effectively identified, especially in rainy or foggy weather. On the other hand, due to the negligence of vehicle users, the warning triangles are often lost, making it difficult to provide warnings on the road, which often leads to serious secondary traffic accidents.

[0004] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a temporary warning device for highway accidents. This temporary warning device can be set up on the side of the road and can be used in a timely manner when needed by the user. Moreover, the warning device can automatically emit light to provide active warning and has reflective strips to provide passive warning, thereby improving the warning effect of the temporary warning device and effectively reducing the probability of secondary traffic accidents caused by vehicle breakdowns or a vehicle accident that leads to the vehicle being parked on the side of the road.

[0006] This utility model provides a temporary warning device for highway accidents, including a base and a temporary warning device. The temporary warning device and the base are detachably connected, and the base is fixed at a position set beside the highway.

[0007] The temporary warning device includes a warning device housing and an active warning unit disposed within the warning device housing;

[0008] The active warning unit includes a warning LED, a lithium battery, a lithium battery charging circuit, and a lithium battery power supply control circuit. The input terminal of the warning LED is connected to the output terminal of the battery power supply control circuit, the input terminal of the lithium battery power supply control circuit is connected to the positive terminal of the lithium battery, and the lithium battery charging circuit is used to manage the charging of the lithium battery.

[0009] The warning device housing is provided with a light-transmitting window, which is sealed with a transparent material.

[0010] The outer wall of the warning device housing is also provided with a reflective strip.

[0011] Furthermore, the outer wall of the warning device housing is provided with a locking tongue, which is inserted into the base and locked when the temporary warning device is not in use.

[0012] Furthermore, the base includes a base housing, and the lower side wall of the base housing is provided with a latch through hole, through which the latch extends into the base housing;

[0013] The base housing is provided with a locking mechanism for locking the latch and for contact locking.

[0014] Furthermore, the locking mechanism includes a drive motor, a drive gear, a driven gear, a drive shaft, and a locking element;

[0015] A partition is fixedly installed inside the base housing, which divides the internal space of the base housing into upper and lower parts.

[0016] The lower surface of the partition is fixedly provided with a bearing seat I, and the inner side of the base housing is fixedly provided with a bearing seat II. The two ends of the drive shaft are rotatably provided with bearing seat I and bearing seat II respectively. The driven gear is fixedly sleeved on the drive shaft. The drive gear meshes with the driven gear. The drive motor is connected to the drive gear in a transmission. The locking member is fixedly provided on the drive shaft.

[0017] The locking element has an arc-shaped structure, with one end fixedly mounted on the drive shaft and the other end being a free end;

[0018] The latch has a strip-shaped locking hole, and the free end of the locking member is embedded in the locking hole when the latch is locked and disengaged from the locking hole when the latch is released.

[0019] Furthermore, the base is also equipped with a power supply module, which includes a solar panel, an energy storage battery, and a photovoltaic power supply unit;

[0020] The solar panel is fixedly mounted on the outer wall of the top of the base housing. The output end of the solar panel is connected to the input end of the photovoltaic power supply unit. The output end of the photovoltaic power supply unit is connected to the energy storage battery, and the photovoltaic power supply unit also supplies power to the lithium battery and the lithium battery power supply control circuit.

[0021] Furthermore, a plug is fixedly installed on the outer wall of the alarm housing, and a socket mechanism is fixedly installed inside the base housing;

[0022] The socket mechanism includes a socket housing, a sliding rod, a first fixing plate, a second fixing plate, and a spring;

[0023] There are two sliding rods and springs, and they correspond one-to-one. The first fixing plate and the second fixing plate are both fixedly installed at the bottom of the socket housing and the first fixing plate and the second fixing plate are parallel.

[0024] The two ends of the sliding rod pass through the first fixed plate and the second fixed plate respectively, and the sliding rod can slide along its own axis. The left end of the sliding rod has a first stop, and the right end of the sliding rod is fixedly provided with a second stop. The spring is sleeved on the sliding rod and located between the second fixed plate and the second stop. The right end of the sliding rod is provided with a socket electrode. The two electrodes of the two sliding rods correspond to the positive and negative terminals of the photovoltaic power supply unit, respectively. The plug is provided with two sockets, and the two sockets correspond one-to-one with the two sliding rods. The sockets are provided with plug electrodes, and the plug electrodes correspond to the positive and negative terminals of the lithium battery charging circuit, respectively.

[0025] Furthermore, the lithium battery power supply control circuit includes resistors R1, R2, transistors Q2 and Q3, PMOS transistor Q1, resistors R3, R4, R5, R6, and R7.

[0026] One end of resistor R1 is connected to the plug electrode corresponding to the positive terminal of the lithium battery charging circuit, and the other end of resistor R1 is grounded through resistor R2. The common connection point between resistors R2 and R1 is connected to the base of transistor Q3. The source of PMOS transistor Q1 serves as the input terminal of the lithium battery power supply control circuit. The drain of PMOS transistor Q1 is connected to one end of resistor R7, and the other end of resistor R7 serves as the output terminal of the lithium battery power supply control circuit and is connected to the warning light LED. The emitter of transistor Q3 is connected to the source of PMOS transistor Q1, and the collector of transistor Q3 is grounded through resistor R3. The collector of transistor Q3 is connected to the base of transistor Q2 through resistor R5, the emitter of transistor Q2 is grounded, the collector of transistor Q2 is connected to the gate of PMOS transistor Q1 through resistor R4, and the gate of PMOS transistor Q1 is connected to the source of PMOS transistor Q1 through resistor R6.

[0027] The beneficial effects of this utility model are as follows: This utility model allows the temporary warning device to be installed on the side of the road and can be used by the user when needed. Moreover, the warning device can automatically emit light for active warning and has reflective strips for passive warning, thereby improving the warning effect of the temporary warning device (especially the warning effect in rainy and foggy weather). It can effectively reduce the probability of secondary traffic accidents caused by vehicle breakdowns or a traffic accident that leads to the vehicle being parked on the side of the road. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2This is a schematic diagram of the locking component structure of this utility model.

[0031] Figure 3 This is a schematic diagram of the plug and socket structure of this utility model.

[0032] Figure 4 This is a schematic diagram of the lithium battery power supply control circuit of this utility model.

[0033] Figure 5 This is a schematic diagram of the electrical structure of this utility model. Detailed Implementation

[0034] The present invention will be further described in detail below:

[0035] This utility model provides a temporary warning device for highway accidents, including a base and a temporary warning device. The temporary warning device and the base are detachably connected. The base is fixed at a set position next to the highway. Generally, a fixed point is set at a set distance next to the highway. The fixed point can be set manually, such as a base made of concrete. The base is then fixed with bolts. A temporary warning device is set at each fixed point.

[0036] The temporary warning device includes a warning device housing 5 and an active warning unit disposed within the warning device housing;

[0037] The active warning unit includes a warning LED, a lithium battery, a lithium battery charging circuit, and a lithium battery power supply control circuit. The input terminal of the warning LED is connected to the output terminal of the battery power supply control circuit, and the input terminal of the lithium battery power supply control circuit is connected to the positive terminal of the lithium battery. The lithium battery charging circuit is used to manage the charging of the lithium battery. The LED is generally selected to have a bright color for better warning effect, such as a yellow LED.

[0038] The warning device housing is provided with a light-transmitting window 7, which is sealed by a transparent material, such as glass or transparent plastic.

[0039] The outer wall of the warning device housing 5 is also provided with a reflective strip 6. Through this invention, the temporary warning device can be installed on the side of a road and can be readily accessed when needed. Furthermore, the warning device can automatically emit light for active warning and has its own reflective strip for passive warning, thereby improving the warning effect of the temporary warning device and effectively reducing the probability of secondary traffic accidents caused by vehicle malfunctions or accidents leading to vehicles being parked on the roadside.

[0040] In this embodiment, a locking tongue 8 is provided on the outer wall of the warning device housing. The locking tongue is inserted into the base and locked when the temporary warning device is not in use.

[0041] Among them: such as Figure 1 , Figure 2 As shown: The base includes a base housing 2, and the lower side wall of the base housing 2 is provided with a locking tongue through hole, through which the locking tongue 8 extends into the base housing;

[0042] The base housing is provided with a locking mechanism for locking the latch 8 and for contact locking.

[0043] The locking mechanism includes a drive motor 13, a drive gear 14, a driven gear 10, a drive shaft 11, and a locking element 15;

[0044] A partition 17 is fixedly installed inside the base housing 2, which divides the internal space of the base housing into upper and lower parts; the locking mechanism is located in the lower part of the partition, while the socket is located in the upper part of the partition and fixed to the partition.

[0045] The lower surface of the partition is fixedly provided with a bearing seat I 16, and the inner side of the base housing is fixedly provided with a bearing seat II 12. Of course, a rotating bearing is provided inside the bearing seat. The two ends of the drive shaft 11 are rotatably provided in bearing seat I and bearing seat II, respectively. The driven gear 10 is fixedly sleeved on the drive shaft. The drive gear 14 meshes with the driven gear 10. The drive motor is connected to the drive gear in a transmission connection. The locking member 15 is fixedly provided on the drive shaft. The transmission connection between the drive motor and the drive gear refers to the transmission connection between the output shaft of the drive motor and the drive gear through an existing gear pair (not shown in the figure, this is prior art).

[0046] like Figure 3 As shown, the locking member 15 has an arc-shaped structure, with one end fixedly mounted on the drive shaft and the other end being a free end;

[0047] The latch 8 has a strip-shaped locking hole 9, wherein the locking hole is a strip-shaped hole, which facilitates the free end of the locking member to smoothly enter and disengage from the locking hole. The free end of the locking member is embedded in the locking hole when the latch is locked and disengaged from the locking hole when the latch is released. The drive motor adopts an existing forward and reverse stepper motor. By setting the rotation angle, the locking member can be embedded in the locking hole when locked, and the free end of the locking member can disengage from the locking hole when the lock is engaged. With the above structure, it is convenient for users to engage the lock when driving the temporary alarm and to lock it in time when returning it, preventing the temporary lock from being lost.

[0048] For ease of management, a controller is typically installed inside the base, connecting to a server via an existing communication network (such as 5G). A QR code is located on the base; users scan the QR code with their smartphones to access the server. Users register their information on the server, such as identity information and contact details. After successful registration, the user sends a retrieval request via their smartphone. Upon receiving the request, the server sends a retrieval command to the base's controller, which then controls the drive motor (each drive motor has its own drive controller, which is included at the factory) to unlock. A photoelectric switch is located inside the latch hole on the base housing. The signal from the photoelectric switch is used to input the controller. When the latch is inserted, the light path of the photoelectric switch is blocked, and the photoelectric switch inputs a low level to the controller. The controller is then controlled by this low level to drive the motor, causing the locking element to be embedded in the locking hole. When the lock is released, the temporary controller is removed. At this time, the light path of the photoelectric switch is not blocked, and the temporary alarm of the controller device is activated. The above process can be achieved using existing technology. Of course, in order to recover costs, the server can also set corresponding charging standards and deduct payments through user information linked to accounts, such as bank accounts, WeChat accounts, etc. Of course, the power supply for the controller and photoelectric switch is provided by the power supply module.

[0049] Of course, the success of the temporary alarm's return can be determined by adjusting the position of the photoelectric switch. For example, the photoelectric switch's light path will only be blocked when the temporary alarm's latch is fully inserted; otherwise, it will not be blocked. Furthermore, the temporary alarm's latch can only be locked when the latch is fully inserted. Figure 1 In the diagram, the two arcs at the latch position represent the photoelectric switch, and the two broken arcs represent the latch blocking the photoelectric switch.

[0050] In this embodiment, the base is also provided with a power supply module, which includes a solar panel 1, an energy storage battery, and a photovoltaic power supply unit;

[0051] The solar panel is fixedly mounted on the outer wall of the top of the base housing. The output end of the solar panel is connected to the input end of the photovoltaic power supply unit. The output end of the photovoltaic power supply unit is connected to the energy storage battery, and the photovoltaic power supply unit also supplies power to the lithium battery and the lithium battery power supply control circuit. The photovoltaic power supply unit is used to manage the electrical energy output by the solar panel. The energy storage battery uses existing lithium batteries and has existing battery management circuits. With the above structure, there is no need to set up an additional power source. The photovoltaic and energy storage batteries can provide power, saving operating costs. Whether the photovoltaic power supply unit directly supplies power or the energy storage battery supplies power can be switched through existing control methods. For example, when the ambient light intensity is sufficient, the photovoltaic power supply unit supplies power to the controller, drive motor, etc., and charges the lithium battery (when the temporary warning device is not used) and the energy storage battery. When the light intensity is insufficient, the energy storage battery provides electrical energy. This can also be solved by existing technology, which will not be elaborated here.

[0052] In this embodiment, a plug 4 is fixedly installed on the outer wall of the alarm housing, and a socket mechanism is fixedly installed inside the base housing;

[0053] The socket mechanism includes a socket housing 3, a sliding rod 34, a first fixing plate 31, a second fixing plate 32, and a spring 35;

[0054] There are two sliding rods and springs, and they correspond one-to-one. The first fixing plate and the second fixing plate are both fixedly installed at the bottom of the socket housing and the first fixing plate and the second fixing plate are parallel.

[0055] The two ends of the sliding rod pass through the first fixed plate and the second fixed plate respectively, and the sliding rod can slide along its own axis. The left end of the sliding rod has a first stop 33, and the right end of the sliding rod is fixedly provided with a second stop 36. The spring is sleeved on the sliding rod and located between the second fixed plate and the second stop. The right end of the sliding rod is provided with a socket electrode 37. The two electrodes of the two sliding rods correspond to the positive and negative terminals of the photovoltaic power supply unit, respectively. The plug is provided with two sockets, and the two sockets correspond one-to-one with the two sliding rods. The sockets are provided with plug electrodes 41, which correspond to the positive and negative terminals of the lithium battery charging circuit, respectively. That is to say, with the above structure, when the plug is inserted into the socket, under the action of the spring preload, the socket electrodes of the two sliding rods and the plug electrodes in the sockets make contact and connect electrically, thereby charging the lithium battery of the temporary alarm after it is returned. Moreover, with the above structure, the temporary alarm completes the circuit connection operation at the same time as insertion, so there is no need to set up an additional power supply line, because the plug and the latch must be inserted at the same time to complete the return smoothly.

[0056] In addition, the correspondence between the plug electrodes and the positive and negative terminals of the lithium battery charging circuit mentioned above means that one plug electrode is connected to the positive terminal of the lithium battery charging circuit and the other plug electrode is connected to the negative terminal of the lithium battery power supply circuit. This ensures a complete current loop when the plug electrodes and socket electrodes are in contact and electrically connected. Of course, the principle of the correspondence between the positive and negative terminals of the socket electrodes and the plug electrodes is the same.

[0057] In this embodiment, the lithium battery power supply control circuit includes resistor R1, resistor R2, transistor Q2, transistor Q3, PMOS transistor Q1, resistor R3, resistor R4, resistor R5, resistor R6 and resistor R7.

[0058] One end of resistor R1 is connected to the plug electrode corresponding to the positive terminal of the lithium battery charging circuit, and the other end of resistor R1 is grounded through resistor R2. The common connection point between resistors R2 and R1 is connected to the base of transistor Q3. The source of PMOS transistor Q1 serves as the input terminal of the lithium battery power supply control circuit. The drain of PMOS transistor Q1 is connected to one end of resistor R7, and the other end of resistor R7 serves as the output terminal of the lithium battery power supply control circuit and is connected to the warning light LED. The emitter of transistor Q3 is connected to the source of PMOS transistor Q1, and the collector of transistor Q3 is grounded through resistor R3. The collector of transistor Q3 is connected to the base of transistor Q2 through resistor R5, the emitter of transistor Q2 is grounded, the collector of transistor Q2 is connected to the gate of PMOS transistor Q1 through resistor R4, and the gate of PMOS transistor Q1 is connected to the source of PMOS transistor Q1 through resistor R6. In this configuration, transistor Q3 is a P-type transistor. When the plug electrode and the socket electrode are in contact and electrically connected, it indicates that the temporary warning device is not in use. At this time, the base of transistor Q3 is at a high level, transistor Q3 is cut off, transistor Q2 is cut off, and thus PMOS transistor Q1 is cut off. The lithium battery is not powered; instead, it can be charged through the energy storage battery. When the temporary warning device is in use, the plug electrode and the socket electrode are separated. At this time, the base of transistor Q3 is at a low level, thus transistor Q3 is turned on, followed by transistor Q2 and PMOS transistor Q1. The warning LED lights up, thus providing an active warning. The ground in the above configuration is the 0 potential point, i.e., the negative terminal of the power supply circuit.

[0059] in, Figure 5In the diagram, the dashed line represents the electrical signal, which reacts to the current or high / low level. The dotted line represents the communication signal, used to issue corresponding commands. Both the photovoltaic power supply unit and the energy storage battery can supply power to the photoelectric switch, controller, and drive motor. Of course, the rated voltages of these three devices are different, so they can be processed using existing voltage regulator or buck converter chips. For example, if the photovoltaic and energy storage batteries both output 12V, and the controller is generally 5V, then the LM2596 chip can be used to convert 12V to 5V for power supply. These are all existing technologies and will not be elaborated on here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A temporary warning device for highway accidents, characterized in that: It includes a base and a temporary warning device, the temporary warning device and the base being detachably connected, the base being fixed at a designated location beside the road; The temporary warning device includes a warning device housing and an active warning unit disposed within the warning device housing; The active warning unit includes a warning LED, a lithium battery, a lithium battery charging circuit, and a lithium battery power supply control circuit. The input terminal of the warning LED is connected to the output terminal of the battery power supply control circuit, the input terminal of the lithium battery power supply control circuit is connected to the positive terminal of the lithium battery, and the lithium battery charging circuit is used to manage the charging of the lithium battery. The warning device housing is provided with a light-transmitting window, which is sealed with a transparent material. The outer wall of the warning device housing is also provided with a reflective strip.

2. The temporary highway accident warning device according to claim 1, characterized in that: The outer wall of the alarm housing is provided with a locking tongue, which is inserted into the base and locked when the temporary alarm is not in use.

3. The temporary highway accident warning device according to claim 2, characterized in that: The base includes a base housing, and the lower side wall of the base housing is provided with a locking tongue through hole, through which the locking tongue extends into the base housing; The base housing is provided with a locking mechanism for locking the latch and for contact locking.

4. The temporary highway accident warning device according to claim 3, characterized in that: The locking mechanism includes a drive motor, a drive gear, a driven gear, a drive shaft, and a locking element; A partition is fixedly installed inside the base housing, which divides the internal space of the base housing into upper and lower parts. The lower surface of the partition is fixedly provided with a bearing seat I, and the inner side of the base housing is fixedly provided with a bearing seat II. The two ends of the drive shaft are rotatably provided with bearing seat I and bearing seat II respectively. The driven gear is fixedly sleeved on the drive shaft. The drive gear meshes with the driven gear. The drive motor is connected to the drive gear in a transmission. The locking member is fixedly provided on the drive shaft. The locking element has an arc-shaped structure, with one end fixedly mounted on the drive shaft and the other end being a free end; The latch has a strip-shaped locking hole, and the free end of the locking member is embedded in the locking hole when the latch is locked and disengaged from the locking hole when the latch is released.

5. The temporary highway accident warning device according to claim 4, characterized in that: The base is also equipped with a power supply module, which includes a solar panel, an energy storage battery, and a photovoltaic power supply unit. The solar panel is fixedly mounted on the outer wall of the top of the base housing. The output end of the solar panel is connected to the input end of the photovoltaic power supply unit. The output end of the photovoltaic power supply unit is connected to the energy storage battery, and the photovoltaic power supply unit also supplies power to the lithium battery and the lithium battery power supply control circuit.

6. The temporary highway accident warning device according to claim 5, characterized in that: A plug is fixedly installed on the outer wall of the alarm housing, and a socket mechanism is fixedly installed inside the base housing; The socket mechanism includes a socket housing, a sliding rod, a first fixing plate, a second fixing plate, and a spring; There are two sliding rods and springs, and they correspond one-to-one. The first fixing plate and the second fixing plate are both fixedly installed at the bottom of the socket housing and the first fixing plate and the second fixing plate are parallel. The two ends of the sliding rod pass through the first fixed plate and the second fixed plate respectively, and the sliding rod can slide along its own axis. The left end of the sliding rod has a first stop, and the right end of the sliding rod is fixedly provided with a second stop. The spring is sleeved on the sliding rod and located between the second fixed plate and the second stop. The right end of the sliding rod is provided with a socket electrode. The two electrodes of the two sliding rods correspond to the positive and negative terminals of the photovoltaic power supply unit, respectively. The plug is provided with two sockets, and the two sockets correspond one-to-one with the two sliding rods. The sockets are provided with plug electrodes, and the plug electrodes correspond to the positive and negative terminals of the lithium battery charging circuit, respectively.

7. The temporary highway accident warning device according to claim 6, characterized in that: The lithium battery power supply control circuit includes resistors R1 and R2, transistors Q2 and Q3, PMOS transistor Q1, resistors R3, R4, R5, R6, and R7. One end of resistor R1 is connected to the plug electrode corresponding to the positive terminal of the lithium battery charging circuit, and the other end of resistor R1 is grounded through resistor R2. The common connection point between resistors R2 and R1 is connected to the base of transistor Q3. The source of PMOS transistor Q1 serves as the input terminal of the lithium battery power supply control circuit. The drain of PMOS transistor Q1 is connected to one end of resistor R7, and the other end of resistor R7 serves as the output terminal of the lithium battery power supply control circuit and is connected to the warning light LED. The emitter of transistor Q3 is connected to the source of PMOS transistor Q1, and the collector of transistor Q3 is grounded through resistor R3. The collector of transistor Q3 is connected to the base of transistor Q2 through resistor R5, the emitter of transistor Q2 is grounded, the collector of transistor Q2 is connected to the gate of PMOS transistor Q1 through resistor R4, and the gate of PMOS transistor Q1 is connected to the source of PMOS transistor Q1 through resistor R6.