Automatic shopping following system based on ultra wide band technology and RFID

Abstract

The utility model provides an automatic shopping following system based on an ultra wide band technology and RFID, which comprises a customer identification end, a shopping cart terminal and a commodity identification end, and is suitable for a large-scale shopping place with a large-area sales area and a large variety of commodities. The UWB anchor point of the shopping cart terminal is communicated with the UWB tag of the customer identification terminal, so that the shopping cart in the store accurately follows the customer in real time; the RFID card reader of the shopping cart terminal is communicated with the RFID tag of the commodity identification terminal, so that the commodity identification of the shopping cart is realized; the combination of UWB and RFID has the advantages of stability and accuracy on the automatic shopping following system. And meanwhile, during dormancy, the shopping cart terminal is electrically connected with the charging circuit of the customer identification end through the charging port for charging, so that the shopping cart has the advantages of low power consumption and high efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shopping carts, in particular to an automatic shopping following system based on ultra-wideband technology and RFID. BACKGROUND

[0002] With the continuous development of intelligent retail, automatic following shopping carts have become one of the key technologies to improve the shopping experience and reduce the burden on consumers. Traditional shopping carts need to be manually pushed and pulled by consumers, and often have problems such as improper distance between the shopping cart and the customer, inconvenient operation during shopping, etc., resulting in poor consumer experience and low operational efficiency of the store. Therefore, the emergence of intelligent shopping carts not only helps to improve the shopping experience of consumers, but also optimizes the operational efficiency of the store.

[0003] The existing automatic following shopping cart mainly has four technical solutions: a technical solution based on visual recognition and deep learning, a technical solution based on laser radar and sensors, a technical solution based on inertial navigation and sensor fusion, and a technical solution based on wireless communication (UWB) and RFID. The technical solution based on visual recognition and deep learning has been successfully commercialized abroad, generally relying on existing cameras and image processing algorithms, with simple hardware deployment, but the recognition effect is greatly affected by environmental light changes, and a large amount of computing resources are required, which is not the best solution. The technical solution based on laser radar and sensors can achieve high-precision environmental perception and strong anti-interference capability, but the hardware is relatively expensive, occupies a large space, and is heavy, affecting the use experience of the shopping cart. The technical solution based on inertial navigation and sensor fusion can achieve precise positioning in indoor environments without GPS, with lower hardware and maintenance costs, but the inertial navigation system is subject to position tracking and motion control, and cannot provide product recognition capability, making it difficult to expand functions.

[0004] Compared with the above technical solutions, the application of wireless communication (UWB) and RFID in automatic following shopping carts has unique advantages. UWB technology provides centimeter-level positioning accuracy, which can ensure that the shopping cart accurately follows the customer. Compared with visual recognition, UWB is not affected by light and environmental complexity, and can work stably under various conditions. RFID technology plays a key role in product identification and automatic settlement, through real-time communication between wireless tags and the shopping cart system, it can quickly and accurately identify the products in the shopping cart, reduce queuing time, and improve settlement efficiency. Compared with laser radar or inertial navigation systems, the combination of UWB and RFID not only has an advantage in cost, but also provides a low-power, high-performance solution suitable for long-term operation of automatic shopping experience. In addition, this solution can be flexibly extended to large-scale retail environments, achieving precise positioning and seamless payment, meeting the demand for intelligentization and high efficiency in the modern retail industry.

[0005] Therefore, it is necessary to provide an automatic shopping following system based on ultra-wideband technology and RFID. SUMMARY

[0006] Based on the above technical background problems, the application provides an automatic shopping following system based on ultra-wideband technology and RFID, which comprises a customer identification end, a shopping cart terminal and a commodity identification end, and is suitable for large-scale stores with large sales area and various commodities. The customer identification end comprises an MCU1, a UWB tag, a battery, a charging circuit and a voltage conversion circuit one. The shopping cart terminal comprises a power interface, a voltage conversion circuit two, a UWB anchor point, an MCU2, a display screen, a motor driving circuit and an RFID card reader. The commodity identification end comprises an RFID tag. The shopping cart terminal communicates with the UWB tag of the customer identification end through the UWB anchor point and communicates with the RFID tag of the commodity identification end through the RFID card reader when running, and is electrically connected with the charging circuit of the customer identification end through the charging port when sleeping.

[0007] The customer identification end comprises an MCU1, a UWB tag, a battery, a charging circuit and a voltage conversion circuit one. The battery is a CR2032 button cell. The VIN pin and the GND pin of the charging circuit are connected with the charging port of the shopping cart terminal through charging contacts, and the battery is charged through the BAT pin. The voltage conversion circuit one comprises a linear voltage stabilizer one and a step-down converter one, the linear voltage stabilizer one converts the battery voltage to 1.8V, and the step-down converter one converts the battery voltage to 1.2V. The UWB tag and the MCU1 are realized simultaneously by using an integrated UWB SoC chip.

[0008] Preferably, the VBATT pin of the MCU1 is connected with the battery voltage, the VDDIP2 pin is connected with the 1.2V output by the step-down converter one, the QSPI1_CS pin is connected with the 1.8V output by the linear voltage stabilizer one as a chip selection signal pin, the ANT0, ANT1 and ANT2 pins communicate with the UWB anchor point of the shopping cart terminal.

[0009] The shopping cart terminal comprises a charging port, a voltage conversion circuit two, a UWB anchor point, an MCU2, a display screen, a motor driving circuit and an RFID card reader. The charging port comprises 5V charging contacts and GND charging contacts, and is connected with a charging circuit of the customer identification end. The voltage conversion circuit two comprises a PFET voltage reduction control circuit one, a linear voltage stabilizer two, a linear voltage stabilizer three and a linear voltage stabilizer four, which respectively convert 48V voltage into 12V, 12V into 5V, 5V into 3.3V and 3.3V into 1.35V. The UWB anchor point is realized by an integrated UWB SoC chip. The MCU2 is connected with the display screen, the RFID card reader and the motor driving circuit, and simultaneously comprises a Hall interface, a Debug interface, a temperature detection and an indicator light. The motor driving circuit comprises an operational amplifier module and a driving module, the driving module outputs three-phase voltage required by the motor according to a control signal generated by the MCU2, and the operational amplifier module collects three-phase current of the motor and simultaneously feeds back the motor state to the MCU2.

[0010] Preferably, the display screen and the RFID card reader are interfaces reserved for external display screen and RFID card reader.

[0011] Preferably, a VDD135 pin of the UWB anchor point is connected with 1.35V output by the linear voltage stabilizer four, and VBATT0 and VBATT1 pins are both connected with 3.3V output by the linear voltage stabilizer three; an SPI pin is connected with an SPI interface of the MCU2; reset, sleep and disable pins are also connected with IO ports in the MCU2; ANT0, ANT1 and ANT2 communicate with a UWB tag of the customer identification end.

[0012] The RFID card reader of the shopping cart terminal communicates with the RFID tag of the commodity identification end, so as to realize identification of the shopping cart to the commodity; the combination of UWB and RFID has advantages of stability and accuracy in the automatic shopping following system. Meanwhile, when sleeping, the shopping cart terminal is charged by the charging port and the charging circuit of the customer identification end, so as to have advantages of low power consumption and high efficiency.

[0013] The automatic shopping following system based on the ultra-wideband technology and RFID, through the UWB anchor point of the shopping cart terminal and the UWB tag of the customer identification end, realizes the real-time and accurate following of the shopping cart to the customer in the store; through the RFID card reader of the shopping cart terminal and the RFID tag of the product identification end, realizes the identification of the shopping cart to the product; the combination of UWB and RFID has the advantages of stability and accuracy on the automatic shopping following system. Meanwhile, when in sleep, the shopping cart terminal is electrically connected to the charging circuit of the customer identification end through the charging port for charging, and has the advantages of low power consumption and high efficiency. The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the embodiments of the present application.

[0014] In order to make the above content of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation to the scope, for the ordinary skilled in the art, without paying creative labor, other related drawings can also be obtained from these drawings.

[0016] Figure 1 The connection block diagram of the automatic shopping following system based on the ultra-wideband technology and RFID of the present application;

[0017] Figure 2 The principle diagram of the battery, charging circuit and voltage conversion circuit one of the customer identification end in the automatic shopping following system based on the ultra-wideband technology and RFID of the present application;

[0018] Figure 3 The principle diagram of the MCU1 and UWB tag of the customer identification end in the automatic shopping following system based on the ultra-wideband technology and RFID of the present application;

[0019] Figure 4 The principle diagram of the charging port and voltage conversion circuit two of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID of the present application;

[0020] Figure 5 The principle diagram of the MCU2, display screen and RFID card reader of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID of the present application;

[0021] Figure 6A schematic diagram of the UWB anchor point of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID according to the present application;

[0022] Figure 7 A schematic diagram of the motor driving circuit of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID according to the present application;

[0023] Numbering in the figure:

[0024] 10: customer identification terminal; 20: shopping cart terminal; 30: product identification terminal;

[0025] 101: MCU1; 102: UWB tag; 103: battery; 104: charging circuit; 105: voltage conversion circuit one; 1051: linear voltage stabilizer one; 1052: step-down converter two;

[0026] 201: charging port; 202: UWB anchor point; 203: MCU2; 204: display screen; 205: motor driving circuit; 206: RFID card reader; 207: voltage conversion circuit two; 2051: operational amplifier module; 2052: driving module; 2071: PFET step-down control circuit one; 2072: linear voltage stabilizer two; 2073: linear voltage stabilizer three; 2074: linear voltage stabilizer four;

[0027] 301: RFID tag. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application but only represents selected embodiments of the present application.

[0029] Please refer to Figure 1The diagram below shows the connection of an automated shopping tracking system based on ultra-wideband technology and RFID as described in this invention. It includes a customer identification terminal 10, a shopping cart terminal 20, and a product identification terminal 30. The customer identification terminal 10 includes an MCU1 (101), a UWB tag (102), a battery (103), a charging circuit (104), and a voltage conversion circuit one (105). The shopping cart terminal 20 includes a charging port (201), a UWB anchor point (202), an MCU2 (203), a display screen (204), a motor drive circuit (205), an RFID reader (206), and a voltage conversion circuit two (207). The product identification terminal 30 includes an RFID tag (301). When the shopping cart terminal 20 is running, it communicates with the UWB tag (102) of the customer identification terminal 10 through the UWB anchor point (202) and with the RFID tag (301) of the product identification terminal 30 through the RFID reader (206); when it is in sleep mode, it is electrically connected to the charging circuit (104) of the customer identification terminal 10 through the charging port (201).

[0030] Please see Figure 2 This is a schematic diagram of the battery, charging circuit, and voltage conversion circuit of the customer identification terminal in an automated shopping follow-up system based on ultra-wideband technology and RFID, as described in this invention (all numbers below this paragraph correspond to...). Figure 1 The circuit includes a battery (103), a charging circuit (104), and a voltage conversion circuit (105). The VIN and GND pins (4) of the charging circuit (104) are connected to the charging port of the shopping cart terminal 20 via charging contacts, and the battery 103 is charged via the BAT pin (3). The battery 103 is a CR2032 button cell battery. The voltage conversion circuit (105) includes a linear regulator (1051) and a buck converter (1052). The linear regulator (1051) converts the voltage of the battery (103) to 1.8V, and the buck converter (1052) converts the voltage of the battery (103) to 1.2V.

[0031] Please see Figure 3 This is a schematic diagram of the MCU1 and UWB tag at the customer identification end of an automated shopping tracking system based on ultra-wideband technology and RFID, as described in this invention (all numbers below this paragraph correspond to...). Figure 1 As shown in the labels, MCU1 (101) and UWB tag (102) are implemented simultaneously using an integrated UWB SoC chip U4. The VBATT pin of U4 is connected to... Figure 2 The 3.3V in the voltage supply is the power source for U4; the VDDIP2 pin of U4 is connected to... Figure 2 The 1.2V output from the step-down converter (1052) in the middle is used as the internal power input of U4; the QSPI1_CS pin of U4 is connected to Figure 2The 1.8V output by the middle linear voltage stabilizer (1051) is used as the chip selection signal pin, and the high level state of the pin is ensured by the resistor R8; the ANT0, ANT1 and ANT2 are connected to Figure 1 The UWB anchor point (202) communicates.

[0032] Please refer to Figure 4 , the schematic diagram of the charging port and the voltage conversion circuit two of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID (the subscripts in this paragraph correspond to Figure 1 the subscripts in the figure), which comprises the charging port (201) and the voltage conversion circuit two (207). The charging port (201) comprises the 5V charging contact and the GND charging contact (CHARGING-DOT), which are connected to the charging circuit (104) of the customer identification end (10). The voltage conversion circuit two (207) comprises the PFET voltage reduction control circuit one (2071), the linear voltage stabilizer two (2072), the linear voltage stabilizer three (2073) and the linear voltage stabilizer four (2074), the 48V voltage is externally input, the PFET voltage reduction control circuit one (2071) converts the 48V voltage into 12V, the linear voltage stabilizer two (2072) converts the 12V into 5V, the linear voltage stabilizer three (2073) converts the 5V into 3.3V, and the linear voltage stabilizer four (2074) converts the 3.3V into 1.35V.

[0033] Please refer to Figure 5 , the schematic diagram of the MCU2, the display screen and the RFID card reader of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID (the subscripts in this paragraph correspond to Figure 1 the subscripts in the figure), which comprises the MCU2 (203), the display screen (204) and the RFID card reader (206). The display screen (204) and the RFID card reader (206) are interfaces reserved for externally connected display screen and RFID card reader; the MCU2 (203) comprises the chip U9 and its supporting hall interface, Debug interface, temperature acquisition and indicator light part.

[0034] Please refer to Figure 6 , the schematic diagram of the UWB anchor point of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID (the subscripts in this paragraph correspond to Figure 1 the subscripts in the figure). The UWB anchor point (202) is realized by the chip U11; wherein the VDD135 pin of the U11 is connected to 1.35V in Figure 4 , the VBATT0 and VBATT1 pins are both connected to 3.3V in Figure 4 , and the three pins are all power supply for the U10; the SPI pin (3-6) of the U11 is connected to Figure 5The SPI interface of U9 in the figure; the reset, sleep, disable pins (13-15) of U11 are also connected Figure 5 The IO port of U9 in the figure; ANT0, ANT1, ANT2 and Figure 1 The UWB tag (102) communicates.

[0035] Please refer to Figure 7 , the schematic diagram of the motor driving circuit of the shopping cart terminal in the automatic shopping following system based on the ultra-wideband technology and RFID according to the present application (the subscripts in the following paragraphs correspond to Figure 1 the labels shown in the figure), including an operational amplifier module (2051) and a driving module (2052). The driving module (2052) outputs the three-phase voltage required by the motor according to the control signals HINA, LINA, HINB, LINB, HINC, LINC generated by MCU2 (203), and connects the U (A), V (B), W (C) three phases of the motor; the operational amplifier module (2051) collects the three-phase current I_PHASEA, I_PHASEB, I_PHASEC of the motor, and feeds back the motor state to MCU2 (203).

[0036] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An automatic shopping following system based on ultra-wideband technology and RFID, characterized by, The customer identification terminal, the shopping cart terminal and the commodity identification terminal are connected through the charging port and the charging contact point. The customer identification terminal comprises an MCU1, a UWB tag, a battery, a charging circuit and a voltage conversion circuit one; the battery is a CR2032 button cell; the VIN pin and the GND pin of the charging circuit are connected with the charging port of the shopping cart terminal through the charging contact point, and the BAT pin is used for charging the battery; the voltage conversion circuit one comprises a linear voltage stabilizer one and a step-down converter one, the linear voltage stabilizer one converts the battery voltage into 1.8V, and the step-down converter one converts the battery voltage into 1.2V; the UWB tag and the MCU1 are integrated UWB SoC chips and are used for communication at the same time; The VBATT pin of the MCU1 is connected with the battery voltage, the VDDIP2 pin is connected with the 1.2V output by the step-down converter one, the QSPI1_CS pin is connected with the 1.8V output by the linear voltage stabilizer one, and the ANT0, ANT1 and ANT2 pins are used for communication with the UWB anchor point of the shopping cart terminal; The shopping cart terminal comprises a power interface, a voltage conversion circuit two, a UWB anchor point, an MCU2, a display screen, a motor driving circuit and an RFID card reader; the charging port comprises 5V charging contact points and GND charging contact points, and is connected with the charging circuit of the customer identification terminal; the voltage conversion circuit two comprises a PFET step-down control circuit one, a linear voltage stabilizer two, a linear voltage stabilizer three and a linear voltage stabilizer four, which are used for converting 48V voltage into 12V, 12V into 5V, 5V into 3.3V and 3.3V into 1.35V respectively; the UWB anchor point is realized by an integrated UWB SoC chip; the MCU2 is connected with the display screen, the RFID card reader and the motor driving circuit, and simultaneously comprises a Hall interface, a Debug interface, a temperature detection and an indicator light; the motor driving circuit comprises an operational amplifier module and a driving module, the driving module outputs three-phase voltage required by the motor according to the control signal generated by the MCU2, and the operational amplifier module collects three-phase current of the motor and feeds back the motor state to the MCU2; The display screen and the RFID card reader are interfaces reserved for external display screen and RFID card reader; The VDD135 pin of the UWB anchor point is connected with the 1.35V output by the linear voltage stabilizer four, and the VBATT0 and VBATT1 pins are both connected with the 3.3V output by the linear voltage stabilizer three; the SPI pin is connected with the SPI interface of the MCU2; the reset, sleep and disable pins are also connected with the IO port in the MCU2; the ANT0, ANT1 and ANT2 pins are used for communication with the UWB tag of the customer identification terminal; The motor driving circuit comprises an operational amplifier module and a driving module, the driving module outputs three-phase voltage required by the motor according to the control signal generated by the MCU2, and is connected with three phases of the motor; the operational amplifier module collects three-phase current of the motor and feeds back the motor state to the MCU2; The commodity identification terminal comprises an RFID tag. The shopping cart terminal is electrically connected with the charging circuit of the customer identification terminal through the charging port when the shopping cart terminal is in hibernation.

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