Wireless charging shopping cart

Abstract

The utility model provides a wireless charging shopping cart which comprises a cart body frame, a vehicle-mounted battery cabin and a mounting cabin are arranged at the bottom of the cart body frame 1, a vehicle-mounted battery is mounted in the vehicle-mounted battery cabin, and the wireless charging shopping cart further comprises a vehicle-mounted coil fixedly arranged on the inner wall of the mounting cabin, a fan fixedly connected to the inner wall of the mounting cabin and arranged above the vehicle-mounted coil and a ventilation grille. The fan is arranged at the corresponding position of the bottom of the vehicle body frame and located above the fan; the temperature control switch is attached to the surface of the vehicle-mounted coil and connected in series in a power supply loop between the vehicle-mounted battery and the fan, and the wireless charging circuit comprises a vehicle charging management circuit electrically connected with the vehicle-mounted coil and a current limiting resistor connected in series between the output end of the vehicle charging management circuit and the vehicle-mounted battery. The wireless charging function of the shopping cart is achieved, the temperature of the vehicle-mounted coil can be effectively controlled, the service life of a battery is prolonged, and use safety and comfort are improved.

Description

Technical Field

[0001] This utility model relates to the field of shopping cart technology, and more specifically, to a wireless charging shopping cart. Background Technology

[0002] With societal development and increasingly modernized lifestyles, shopping at large and medium-sized supermarkets has become a popular choice for many, offering convenience and speed. While many shopping carts are now hand-pushed or pulled, pushing a heavy hand-pushed cart after a long day of work can be physically and mentally exhausting, even affecting a shopper's mood. As technology advances, electric shopping carts are gradually gaining popularity.

[0003] Most existing electric shopping carts are charged via wired charging, which has problems such as inconvenience and easy damage to the charging interface. In addition, existing shopping carts lack effective heat dissipation measures during charging, which can easily lead to overheating of the battery and charging coil, affecting battery life and safety. At the same time, electric shopping carts cannot provide airflow for the driver during operation, so comfort needs to be improved.

[0004] Therefore, there is an urgent need for a wireless charging shopping cart to solve the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides the following technical solution:

[0006] Wireless charging shopping carts are designed to address these issues.

[0007] The application is as follows:

[0008] A wireless charging shopping cart includes a frame, a battery compartment and a mounting compartment at the bottom of the frame, an onboard battery installed in the battery compartment, and further includes:

[0009] The vehicle-mounted coil is fixedly installed on the inner wall of the mounting compartment to receive external wireless charging signals;

[0010] A fan is fixedly connected to the inner wall of the mounting compartment and positioned above the vehicle coil; the fan is electrically connected to the vehicle battery.

[0011] The ventilation grille is located at a corresponding position at the bottom of the vehicle frame and above the fan;

[0012] The wireless charging circuit includes a microcontroller and a vehicle charging management circuit connected to the vehicle-mounted coil. The output of the vehicle charging management circuit is connected to the vehicle battery via an LDO (Low-Density Array Controller). The vehicle battery is connected to a fan via a temperature control switch located next to the vehicle-mounted coil.

[0013] The vehicle charging management circuit, which is electrically connected to the on-board coil, is used to convert the AC power received by the on-board coil into DC power.

[0014] A temperature control switch is attached to the surface of the vehicle coil and is connected in series in the power supply circuit between the vehicle battery and the fan.

[0015] Preferably, the outer periphery of the vehicle-mounted coil is covered with an electromagnetic shielding layer.

[0016] Preferably, the vehicle charging management circuit is a full-bridge rectifier circuit, including four IGBT switching transistors, and the control electrode of each IGBT switching transistor is connected to the signal output terminal of the microcontroller.

[0017] Preferably, the wireless charging circuit further includes a current-limiting resistor connected between the vehicle coil and the vehicle charging management circuit; it also includes an operational amplifier, whose non-inverting input and inverting input are respectively connected to the two ends of the current-limiting resistor, and whose output is connected to a microcontroller.

[0018] Preferably, the operational amplifier in the wireless charging circuit is directly powered by the vehicle battery, and the current-limiting resistor has a resistance of 10mΩ-50mΩ.

[0019] Preferably, it also includes a human-controlled switch located on the dashboard and connected to the fan.

[0020] Compared with the prior art, this utility model is equipped with a temperature control switch and a fan, which can effectively control the temperature of the vehicle coil, extend battery life, and improve safety. The fan can be turned on by a human-controlled switch during driving to provide airflow to the driver and improve driving comfort. The operational amplifier in the wireless charging circuit can detect the current change on the current-limiting resistor to realize overcurrent protection function and further improve charging safety. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of a specific embodiment of the wireless charging shopping cart provided in this application;

[0022] Figure 2 A bottom-view cross-sectional view of one specific embodiment of the wireless charging shopping cart provided in this application;

[0023] Figure 3 This is a schematic diagram of a specific embodiment of the wireless charging circuit provided in this application.

[0024] The image shows:

[0025] 1. Vehicle frame; 2. Vehicle battery compartment; 21. Vehicle battery; 3. Vehicle coil; 31. Electromagnetic shielding layer; 4. Fan; 5. Ventilation grille; 6. Temperature control switch; 7. Driver's console; 71. Human control switch; 72. Status indicator light; 8. Wireless charging circuit; 9. Installation compartment. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0027] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] like Figure 1-3 As shown, this embodiment proposes a wireless charging shopping cart, including a cart frame 1, a battery compartment 2 and a mounting compartment 9 at the bottom of the cart frame 1, a battery 21 installed in the battery compartment 2 to provide power for the electric drive of the shopping cart and various electrical devices, and also includes:

[0032] The vehicle-mounted coil 3 is fixedly installed on the inner wall of the installation compartment 9 to receive external wireless charging signals. When the shopping cart drives into the ground above the buried coil, the buried coil is energized with AC to generate an AC magnetic field. The vehicle-mounted coil 3 senses the AC magnetic field and generates AC to achieve wireless charging.

[0033] Fan 4 is fixedly connected to the inner wall of the mounting compartment 9 and positioned above the vehicle coil 3. Fan 4 is electrically connected to the vehicle battery 21 and is used to dissipate heat from the vehicle coil 3. Fan 4 can dissipate heat from the vehicle coil 3 during charging to prevent the vehicle coil 3 from overheating and affecting charging efficiency and battery life. At the same time, it can be turned on by human control switch 71 during driving to provide airflow to the driver and improve driving comfort.

[0034] Ventilation grille 5 is located at the corresponding position at the bottom of the vehicle frame 1 and above the fan 4;

[0035] A temperature control switch 6 is attached to the surface of the vehicle coil 3. The switch is connected in series in the power supply circuit between the vehicle battery 21 and the fan 4. When the temperature of the vehicle coil 3 reaches a preset threshold, the switch closes, and the fan 4 starts to dissipate heat from the coil 3. When the temperature drops below the preset threshold, the switch opens, and the fan 4 stops working, thus achieving automatic heat dissipation control.

[0036] The driver's console 7 is fixedly installed at the front end of the vehicle frame 1. A human-controlled switch 71 connected in series with the fan 4 is installed on the driver's console 7. During driving, the driver can turn on the human-controlled switch 71 to activate the fan 4, blowing air upwards to provide ventilation and improve driving comfort. Simultaneously, during charging, the driver can also manually turn on the fan 4 via the human-controlled switch 71 to enhance heat dissipation.

[0037] The operational amplifier AMP in the wireless charging circuit 8 is directly powered by the vehicle battery 21. The current-limiting resistor R has a resistance of 10mΩ-50mΩ and is used to detect changes in the current across the current-limiting resistor R. When the current across the current-limiting resistor 82 exceeds the set value, the operational amplifier detects the increase in the voltage across the current-limiting resistor, and the signal output to the microcontroller flips. The microcontroller then controls the vehicle charging management circuit to pause charging, thus achieving overcurrent protection.

[0038] The wireless charging technology involved in this application is a mature existing technology in this field. For example, the wireless charging circuit disclosed in Chinese patents with application numbers 201711005780.9 or 202223412484.X can also be used. The vehicle-mounted part and the buried part circuit serve as the vehicle charging management circuit and the ground charging management circuit of this application, respectively, and charging is carried out through the AC magnetic field coupling of the ground and vehicle-mounted coils.

[0039] One specific implementation of the vehicle charging management circuit in this application can employ a full-bridge rectifier circuit composed of four IGBT switches. The control electrode of each IGBT switch is connected to the PWM signal output terminal of the microcontroller. The microcontroller is an STC89C52 microcontroller, which serves as the control core of the wireless charging circuit 8. It controls the on / off state of the vehicle charging management circuit based on the voltage signal output by the operational amplifier, thereby controlling the charging process. Simultaneously, the microcontroller also outputs multiple square wave signals to control the switching of each IGBT switch in the vehicle charging management circuit, realizing the AC to DC conversion control. The construction of the full-bridge rectifier circuit composed of four switches is existing technology in this field and will not be described in detail here.

[0040] Specifically, when using this wireless charging shopping cart: a buried coil is pre-installed in the ground. AC mains power is input to the buried coil through the ground charging management circuit, generating an AC magnetic field. When the shopping cart drives over the buried coil, the on-board coil 3 approaches the buried coil, inducing the AC magnetic field and generating AC current. The vehicle charging management circuit converts the AC current received by the on-board coil 3 into DC current. After current limiting by the current limiting resistor R, the current is stepped down and regulated by the LDO voltage regulator module to charge the on-board battery 21. During the charging process, the operational amplifier detects the current change on the current limiting resistor R in real time. When the current exceeds the set value, the operational amplifier output signal flips, and the microcontroller controls the vehicle charging management circuit to stop charging, realizing overcurrent protection.

[0041] Meanwhile, the temperature control switch 6 monitors the temperature of the vehicle coil 3 in real time. The preset threshold of the temperature control switch 6 is usually 60℃-80℃, and a status indicator light 72 is connected between the fan 4 and the human control switch 71. When the temperature reaches 70℃, the temperature control switch closes, the fan 4 starts, and the vehicle coil 3 is cooled to prevent overheating of the vehicle coil 3 from affecting charging efficiency and battery life. When the fan 4 is working, the air is exhausted to the outside of the vehicle through the ventilation grille 5 to ensure the cooling effect. During driving, the driver can turn on the human control switch 71 on the dashboard 7, and the fan 4 will work, blowing air upward through the ventilation grille to provide airflow to the driver and improve driving comfort. The status indicator light 72 can indicate the working status of the fan 4, making it convenient for the driver to know whether the fan 4 is working properly.

[0042] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A wireless charging shopping cart, comprising a cart frame (1), characterized in that, The bottom of the vehicle frame is provided with a vehicle battery compartment (2) and an installation compartment (9). The vehicle battery compartment (2) is equipped with a vehicle battery (21). It also includes: The vehicle-mounted coil (3) is fixedly installed on the inner wall of the mounting compartment (9) to receive external wireless charging signals; A fan (4) is fixedly connected to the inner wall of the mounting compartment (9) and positioned above the vehicle coil (3). The fan (4) is electrically connected to the vehicle battery (21). Ventilation grille (5) is provided at the corresponding position at the bottom of the vehicle frame (1) and is located above the fan (4); The wireless charging circuit (8) includes a microcontroller and a vehicle charging management circuit connected to the vehicle coil. The output of the vehicle charging management circuit is connected to the vehicle battery via an LDO. The vehicle battery is connected to a fan via a temperature control switch. The temperature control switch is located next to the vehicle coil. The vehicle charging management circuit (81), which is electrically connected to the vehicle coil (3), is used to convert the AC power received by the vehicle coil (3) into DC power. A temperature control switch (6) is attached to the surface of the vehicle coil (3). The temperature control switch (6) is connected in series in the power supply circuit between the vehicle battery (21) and the fan (4).

2. The wireless charging shopping cart according to claim 1, characterized in that, The outer periphery of the vehicle-mounted coil (3) is covered with an electromagnetic shielding layer (31).

3. A wireless charging shopping cart according to claim 1, characterized in that, The vehicle charging management circuit is a full-bridge rectifier circuit, which includes four IGBT switching transistors. The control electrode of each IGBT switching transistor is connected to the signal output terminal of the microcontroller.

4. A wireless charging shopping cart according to claim 1, characterized in that, The wireless charging circuit also includes a current-limiting resistor R connected between the vehicle-mounted coil and the vehicle charging management circuit. It also includes an operational amplifier AMP, whose non-inverting and inverting inputs are connected to the two ends of a current-limiting resistor R, and whose output is connected to a microcontroller.

5. A wireless charging shopping cart according to claim 4, characterized in that, The operational amplifier AMP in the wireless charging circuit is directly powered by the vehicle battery (21), and the current limiting resistor R has a resistance of 10mΩ-50mΩ.

6. A wireless charging shopping cart according to claim 1, characterized in that, It also includes a human-controlled switch (71) that is connected to the fan (4) on the driver's cab (7).

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