NFC tag circuit and tag

Abstract

The utility model provides an NFC label circuit and a label, and relates to the technical field of NFC equipment. Comprising a wireless power taking unit which is electrically connected to a DC power supply conversion unit; the DC power supply conversion unit is electrically connected to the main control unit and the NFC communication unit respectively; the wireless power taking unit and the NFC communication unit have a common coupling inductor assembly. The problems of high cost caused by a battery in the NFC tag, safety of a built-in battery and the like are effectively solved, the cost is greatly saved, the weight of the NFC tag can be reduced, and the overall performance and reliability of the NFC tag are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of NFC equipment, and in particular to an NFC tag circuit and a tag. Background Art

[0002] NFC (Near Field Communication) is developed based on contactless radio frequency identification (RFID) technology combined with wireless interconnection technology. It provides a very safe and fast communication method for various electronic products that are becoming more and more popular in our daily lives. The "near field" in the Chinese name of NFC refers to radio waves near the electromagnetic field.

[0003] An NFC tag is a sticky label with an integrated NFC chip, usually consisting of an antenna, an NFC chip, and packaging materials. NFC tags can communicate wirelessly with devices that support NFC technology (such as smartphones, tablets, etc.) over short distances and transmit data without contact. Users only need to bring their NFC-enabled devices close to the NFC tag to achieve fast data transmission, information reading, payment, and other operations.

[0004] At present, NFC tags or structures therein have circuit structures therein and need to be powered. Generally, batteries are built in as their power source. On the one hand, using batteries as one of their components will increase the cost of the device. On the other hand, installing batteries therein will not only increase its weight, but also be detrimental to the safety of the device due to the possibility of leakage and leakage of the battery. On the other hand, even if the device is not working, the standby power consumption and the battery's own loss are detrimental to energy saving. Moreover, maintenance such as replacing batteries requires disassembling the device, which is extremely inconvenient. Therefore, the utility model proposes an NFC tag circuit and a tag to at least partially solve the problems that may exist in the prior art. Utility Model Content

[0005] In order to overcome the above problems or at least partially solve the above problems, the embodiments of the present invention provide an NFC tag circuit and a tag.

[0006] The embodiment of the utility model is achieved as follows:

[0007] The present application embodiment provides an NFC tag circuit, including:

[0008] A wireless power supply unit, which is electrically connected to a DC power supply conversion unit; the DC power supply conversion unit is electrically connected to a main control unit and an NFC communication unit respectively;

[0009] The wireless power collection unit and the NFC communication unit have a common coupling inductor component.

[0010] In some embodiments of the utility model, an ink screen unit is also included, which includes an ink screen and a screen driving unit, and the ink screen is electrically connected to the screen driving unit; the screen driving unit is electrically connected to the display signal end of the main control unit and the output end of the DC power conversion unit.

[0011] In some embodiments of the present utility model, the wireless power extraction unit includes a rectifier filter component and the coupled inductor component;

[0012] The rectifier and filter component comprises a rectifier bridge, two input ends of which are respectively electrically connected to a filter capacitor and are respectively electrically connected to two ends of the coupled inductor component;

[0013] The output end of the rectifier bridge is electrically connected to the input end of the DC power conversion unit.

[0014] In some embodiments of the present utility model, the DC power conversion unit includes a power management chip, whose input terminal is electrically connected to the output terminal of the wireless power extraction unit and is electrically connected to its EN terminal through a second current limiting resistor;

[0015] The output end of the power management chip passes through one end of the filter compensation inductor; the other end of the filter compensation inductor is electrically connected to the filter compensation capacitor as the output end of the DC power conversion unit; from the output end of the DC power conversion unit, it goes to the first voltage divider resistor, to the feedback end (FB pin) and the second voltage divider resistor of the power management chip, and to the ground to form a feedback loop.

[0016] In some embodiments of the present invention, it further includes an adjustment protection unit;

[0017] The regulating and protecting unit comprises a first MOS tube, a gate of which is electrically connected to the main control unit, a drain of which is electrically connected to the output end of the DC power conversion unit through a first current limiting resistor, and a source of which is grounded.

[0018] In some embodiments of the present invention, the NFC communication unit includes: a communication chip, whose LA and LB ends are respectively electrically connected to the two ends of the coupled inductor component, whose power supply end is electrically connected to the output end of the DC power conversion unit; and whose signal processing end is electrically connected to the main control unit.

[0019] In some embodiments of the present invention, the main control unit includes a wireless radio frequency main control chip; the wireless radio frequency main control chip is a TLSR8359F512ET32 chip.

[0020] In some embodiments of the present utility model, the screen driving unit includes a power supply end, which is electrically connected to the output end of the DC power conversion unit and the drain of the second MOS tube through a first inductor;

[0021] Two differential signal terminals are electrically connected to a coupling capacitor; one end of the coupling capacitor is electrically connected to the drain of the second MOS tube, and the other end is electrically connected to the anode of the clamping diode, and the cathode of the clamping diode is grounded;

[0022] The source and gate of the second MOS tube are electrically connected to the wireless radio frequency main control chip of the main control unit.

[0023] In some embodiments of the present invention, an indication circuit is further included, wherein a control end of the indication circuit is electrically connected to the main control unit, and a power supply end of the indication circuit is electrically connected to an output end of the DC power conversion unit.

[0024] The embodiment of the present application also provides an NFC tag, comprising a housing, and a circuit board disposed in the housing;

[0025] The circuit board is provided with the NFC tag circuit.

[0026] In some embodiments of the present invention, an electronic ink screen is also provided on the housing.

[0027] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0028] Through the wireless power supply unit, it is electrically connected to the DC power supply conversion unit; the DC power supply conversion unit is electrically connected to the main control unit and the NFC communication unit respectively; the wireless power supply unit and the NFC communication unit have a common coupling inductor component. It effectively solves the problems of high cost and safety of built-in batteries in NFC tags, greatly saves costs, makes it lightweight, and improves the overall performance and reliability of NFC tags. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the structure of an NFC tag circuit provided in one embodiment of the present utility model;

[0031] Figure 2 A circuit diagram of a wireless power supply unit of an NFC tag circuit provided in one embodiment of the utility model;

[0032] Figure 3 A circuit diagram of a DC power conversion unit of an NFC tag circuit provided in one embodiment of the utility model;

[0033] Figure 4 A circuit diagram of an NFC communication unit of an NFC tag circuit provided in one embodiment of the utility model;

[0034] Figure 5 A circuit diagram of a main control unit of an NFC tag circuit provided in one embodiment of the utility model;

[0035] Figure 6 A circuit diagram of a screen driving unit of an NFC tag circuit provided in one embodiment of the utility model;

[0036] Figure 7 The present invention provides an indicator light circuit diagram of an NFC tag circuit in one embodiment.

[0037] In the figure: 100, wireless power supply unit; 200, DC power supply conversion unit; 300, NFC communication unit; 400, main control unit; 500, ink screen unit. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] It should be noted that in any embodiment of the present application, the ink screen is a display screen using electronic ink technology, which uses microcapsules and charge control technology to display images and text. Unlike traditional LCD screens, the ink screen does not require a backlight, but displays content by applying an electric charge to tiny particles. When the charge changes, the position of the ink particles also changes, forming images and text. The advantages of the ink screen include lower power consumption, good visibility under natural light, and a reading experience that is closer to paper. This makes the ink screen widely used in e-book readers, smart watches, smart tags and other devices that need to display static information for a long time. Although the refresh rate of the ink screen is low and it is not suitable for displaying dynamic content, it has unique advantages in providing a comfortable reading experience and energy saving.

[0040] Example 1

[0041] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0042] Please refer to Figure 1 As shown, an embodiment of the utility model provides an NFC tag circuit, which includes a wireless power supply unit 100, which is electrically connected to a DC power supply conversion unit 200; the DC power supply conversion unit 200 is electrically connected to a main control unit 400 and an NFC communication unit 300 respectively; the wireless power supply unit 100 and the NFC communication unit 300 have a common coupling inductor component.

[0043] In this embodiment, an NFC tag circuit is proposed, and the above technical solution is to solve a series of problems caused by the battery in the NFC tag by adopting a wireless power supply method. Specifically, through the above wireless power supply unit 100, it allows the NFC tag to obtain power from an external wireless source without a built-in battery, thereby eliminating the cost, weight, safety and maintenance problems caused by the battery; through the above DC power supply conversion unit 200, the energy obtained from the wireless power supply unit is converted into the DC power supply required by the tag circuit, ensuring that the NFC tag has sufficient power supply when working; through the NFC communication unit 300 and the main control unit 400, wherein the NFC communication unit 300 is responsible for NFC communication with other devices, and the main control unit 400 is responsible for managing the overall function of the tag, and is operated by the power supply provided by the above DC power supply conversion unit 200; through the above coupling inductor component, the component connects the wireless power supply unit and the NFC communication unit, so that they share the same coupling inductor and other components, and can transmit signals while wirelessly powering, effectively transmitting energy and maintaining the compactness of the circuit.

[0044] As a preferred embodiment, it also includes an ink screen unit 500, which includes an ink screen and a screen driving unit, and the ink screen is electrically connected to the screen driving unit; the screen driving unit is electrically connected to the display signal end of the main control unit 400 and the output end of the DC power conversion unit 200.

[0045] By eliminating the built-in battery, the manufacturing cost of the NFC tag is reduced. Since there is no battery inside and it does not need to be replaced frequently, the long-term maintenance cost is reduced. At the same time, the lack of a built-in battery means that the NFC tag is lighter, which is particularly important in some application scenarios. For example, in the label that needs to be attached to the object, the light weight label is easier to stick. It can also avoid the safety risks caused by battery leakage or leakage, making the NFC tag safer and more reliable, and suitable for more application scenarios; in addition, there is no standby power consumption, and there is no loss of the battery itself, which improves energy efficiency and reduces the impact on the environment. Due to the design of wireless power supply, NFC tags can even be embedded in devices that need to be used for a long time without the need for maintenance or battery replacement.

[0046] Example 2

[0047] The utility model embodiment provides an NFC tag circuit, referring to Figure 2 As shown, the wireless power supply unit 100 includes a rectifier filter component and the coupled inductor component ANT; the rectifier filter component includes a rectifier bridge, and its two input ends are respectively electrically connected to a filter capacitor, and are respectively electrically connected to the two ends of the coupled inductor component ANT; the output end of the rectifier bridge is electrically connected to the input end of the DC power conversion unit 200. The current is coupled through the coupled inductor component ANT, and rectified and output through the rectifier bridge as the input voltage of the DC power conversion unit 200 and as one of the power supplies of the main control unit 400.

[0048] It should be noted that the principle of the above-mentioned coupled inductor component ANT is similar to the wireless charging function of a mobile phone, and it can couple current and signal simultaneously through the inductor coil.

[0049] As a preferred implementation method, refer to Figure 3 As shown, the DC power conversion unit 200 includes a power management chip U6, whose input end is electrically connected to the output end of the wireless power taking unit 100, and is electrically connected to its EN end through a second current limiting resistor R3; the power management chip U6, whose output end passes through one end of the filter compensation inductor L6; the other end of the filter compensation inductor L6 is electrically connected to the filter compensation capacitors C2, C4 and C12, as the output end of the DC power conversion unit 200, through the filter compensation circuit with inductance and capacitor as the output end, the output current waveform is smoother; from the output end of the DC power conversion unit 200, to the first voltage divider resistor R88, to the feedback end FB pin of the power management chip U6 and the second voltage divider resistor R89, to the ground to form a feedback loop.

[0050] The output end of the wireless power supply unit 100 is the output end of the rectifier bridge in the rectifier and filter assembly. The rectifier bridge can be a chip type or a full-wave rectifier bridge composed of four diodes. A half-wave rectifier bridge or a single diode rectifier can also be used in this application. Since the rectification efficiency is not high, full-wave rectification is preferably used in this application. For example, a high-speed switching diode can be used to adapt to the rectification of high-frequency signals. It should be noted that since the signal and power supply are coupled at the same time in this application, there may be high frequency in the current wave of the power supply. The use of a high-frequency switching diode can make the rectification more stable and the heat generation is relatively small, such as a Schottky diode.

[0051] As a preferred implementation method, refer to Figure 3 As shown, it also includes a regulating protection unit, which includes a first MOS tube U1, the gate of the first MOS tube U1 is electrically connected to the main control unit 400, the drain of the first MOS tube U1 is electrically connected to the output end of the DC power conversion unit 200 through a first current limiting resistor R1, and the source of the first MOS tube U1 is grounded.

[0052] As a preferred implementation method, Figure 4 As shown, the NFC communication unit 300 includes: a communication chip U4, preferably a NT3H2211W0FHK chip, whose LA and LB terminals are respectively electrically connected to the two ends of the coupled inductor component, and its power supply terminal is electrically connected to the output terminal of the DC power conversion unit 200; its signal processing terminal is electrically connected to the main control unit 400; the SCL and SDA pins of the chip are electrically connected to the wireless RF main control chip U3 of the above-mentioned main control unit 400, wherein the SDA pin and the SCL pin are respectively electrically connected to the output terminal of the DC power conversion unit 200 through pull-up resistors R7 and R10, providing a pull-up voltage of 3.3V to ensure the stability of the signal, and its FD is connected to the above-mentioned wireless RF main control chip U3, and the signal stability is also improved through the pull-up resistor R11.

[0053] As a preferred implementation method, refer to Figure 5 As shown, the main control unit 400 includes a wireless radio frequency main control chip U3; the wireless radio frequency main control chip U3 is a TLSR8359F512ET32 chip.

[0054] As a preferred implementation method, refer to Figure 6As shown, the ink screen unit 500 includes an ink screen and a screen driving unit, the ink screen is electrically connected to the screen driving unit; the screen driving unit is electrically connected to the display signal end of the main control unit 400 and the output end of the DC power conversion unit 200; the screen driving unit includes a power supply end, which is electrically connected to the output end of the DC power conversion unit 200 and the drain of the second MOS tube U10 through a first inductor L1; two differential signal ends, the coupling capacitor C25 is electrically connected; one end of the coupling capacitor C25 is electrically connected to the drain of the second MOS tube U10, and the other end is electrically connected to the anode of the clamping diode U17, and the cathode of the clamping diode U17 is grounded; the source and gate of the second MOS tube U10 are electrically connected to the wireless RF main control chip U3 of the main control unit 400.

[0055] As a preferred implementation method, refer to Figure 7 As shown, it also includes an indication circuit, a control end of the indication circuit is electrically connected to the main control unit 400 , and a power supply end of the indication circuit is electrically connected to the output end of the DC power conversion unit 200 .

[0056] As an example, see Figures 2 to 6 As shown, when the wireless power taking unit 100 is wirelessly coupled to the current through the above-mentioned coupling inductor component ANT, it is rectified by the rectifier bridge to obtain a voltage of about 12V. The 12V voltage goes to the DC power conversion unit 200 one way and to the wireless RF main control chip U3 of the main control unit 400. At this time, the chip triggers a PWM signal EN_VDD_3V3_PA1 to the gate of the first MOS tube U1, thereby controlling the conduction of the drain and source of the MOS tube U1, so that the first current limiting resistor R1 can be grounded, that is, the signal can change the connection between the first current limiting resistor R1 and the ground. Since the above-mentioned first current limiting resistor is preferably a small resistor of 200Ω, the output terminal voltage of the DC power conversion unit 200 changes, so that the feedback voltage of the feedback loop composed of the first voltage dividing resistor R88 and the second voltage dividing resistor R89 ​​changes, so that the output of the above-mentioned power management chip U6 changes, thereby adjusting the output, so that the output terminal of the above-mentioned DC power conversion unit 200 can stably output a 3.3V voltage.

[0057] It should also be noted that the above-mentioned first voltage-dividing resistor R88 and the second voltage-dividing resistor R89 ​​themselves can also adjust and stabilize their output voltages according to the voltages they output. Through the above-mentioned adjustment protection unit, they can supply power to the above-mentioned main control unit 400, that is, the wireless RF main control chip U3, and detect its power supply, thereby adjusting the voltage to ensure that the circuit can form voltage regulation in time, prevent voltage instability, and ensure the operation of the above-mentioned chip.

[0058] Example 3

[0059] Based on the same concept, an embodiment of the utility model provides an NFC tag, including a shell, and a circuit board arranged in the shell; the circuit board is provided with the above-mentioned NFC tag circuit.

[0060] As a preferred embodiment, the housing is provided with an electronic ink screen. For example, the electronic ink screen can be a 2.9-inch electronic ink screen, and the NFC tag is composed of a 2.9-inch electronic ink screen, a housing and a circuit board, wherein the circuit board is provided with the NFC tag circuit, and there is a three-color LED indicator on it, and the corresponding light color will light up when working. There is no battery in the 2.9-inch NFC tag, so it does not consume any electricity at ordinary times, which is more environmentally friendly; the 2.9-inch NFC tag is a standard NFC, which can power and communicate with the 2.9-inch NFC tag through the NFC function of the mobile phone, and it can also power and communicate with the tag through the NFC card reader made by us, so as to modify the content of the tag; the 2.9-inch NFC tag can wirelessly communicate while taking power wirelessly, and supports mobile phone NFC communication. Users only need to buy a 2.9-inch NFC tag, and refresh and modify the content of the tag through the mobile phone NFC, which is very convenient. Compared with existing Bluetooth tags, their functions are similar, but Bluetooth tags require built-in batteries and consume power all the time. The NFC tags of this application do not require built-in batteries. When they need to work, you only need to bring the tags close to a mobile phone with NFC function or an NFC card reader. Because NFC tags do not require built-in batteries, the entire device can be made thinner and lighter. The above NFC tags can also be used for work badges or other scenarios.

[0061] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. Although optional embodiments of the utility model embodiments have been described, once those skilled in the art know the basic creative concept, they can make additional changes and modifications to these embodiments. Therefore, the attached claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0062] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0063] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An NFC tag circuit, characterized in that: include: A wireless power collection unit electrically connected to the DC power conversion unit; The DC power conversion unit is electrically connected to the main control unit and the NFC communication unit respectively; The wireless power collection unit and the NFC communication unit have a common coupling inductor component.

2. The NFC tag circuit according to claim 1, characterized in that: It also includes an ink screen unit, which includes an ink screen and a screen driving unit, the ink screen is electrically connected to the screen driving unit; the screen driving unit is electrically connected to the display signal end of the main control unit and the output end of the DC power conversion unit.

3. The NFC tag circuit according to claim 1 or 2, characterized in that: The wireless power collection unit includes a rectifier and filter component and the coupled inductor component; The rectifier and filter component comprises a rectifier bridge, two input ends of which are respectively electrically connected to a filter capacitor and are respectively electrically connected to two ends of the coupled inductor component; The output end of the rectifier bridge is electrically connected to the input end of the DC power conversion unit.

4. The NFC tag circuit according to claim 1 or 2, characterized in that: The DC power conversion unit includes a power management chip, an input end of which is electrically connected to the output end of the wireless power extraction unit and is electrically connected to its EN end through a second current limiting resistor; The output end of the power management chip passes through one end of the filter compensation inductor; the other end of the filter compensation inductor is electrically connected to the filter compensation capacitor as the output end of the DC power conversion unit; from the output end of the DC power conversion unit, it goes to the first voltage divider resistor, to the feedback end of the power management chip and the second voltage divider resistor, and to the ground to form a feedback loop.

5. The NFC tag circuit according to claim 4, characterized in that: Also includes a regulating protection unit; The regulating and protecting unit comprises a first MOS tube, a gate of which is electrically connected to the main control unit, a drain of which is electrically connected to the output end of the DC power conversion unit through a first current limiting resistor, and a source of which is grounded.

6. The NFC tag circuit according to claim 1, characterized in that: The NFC communication unit includes: a communication chip whose LA and LB terminals are electrically connected to the two ends of the coupled inductor component respectively, whose power supply terminal is electrically connected to the output terminal of the DC power conversion unit; and whose signal processing terminal is electrically connected to the main control unit.

7. The NFC tag circuit according to claim 1, characterized in that: The main control unit includes a wireless radio frequency main control chip; the wireless radio frequency main control chip is a TLSR8359F512ET32 chip.

8. The NFC tag circuit according to claim 2, characterized in that: The screen driving unit comprises a power supply terminal, which is electrically connected to the output terminal of the DC power conversion unit and the drain of the second MOS tube through a first inductor; Two differential signal terminals are electrically connected to a coupling capacitor; one end of the coupling capacitor is electrically connected to the drain of the second MOS tube, and the other end is electrically connected to the anode of the clamping diode, and the cathode of the clamping diode is grounded; The source and gate of the second MOS tube are electrically connected to the wireless radio frequency main control chip of the main control unit.

9. The NFC tag circuit according to claim 1, characterized in that: It also includes an indication circuit, a control end of the indication circuit is electrically connected to the main control unit, and a power supply end of the indication circuit is electrically connected to the output end of the DC power conversion unit.

10. An NFC tag, characterized in that: It includes a housing and a circuit board arranged in the housing; The circuit board is provided with an NFC tag circuit as claimed in any one of claims 1 to 9.

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