NFC field intensity testing device
By designing a simple NFC field strength test device, the NFC field strength is indicated by the induction circuit and indicator light components, the problems of large size and complex operation of the traditional NFC field strength instrument are solved, and portability and high adaptability are achieved.
Patent Information
- Application Number
- CN202421520507.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-06-28
AI Technical Summary
Traditional NFC field strength meter has large size, complex structure, cumbersome operation, and is not convenient to carry and use, especially in situations where the accuracy requirements are not high.
An NFC field strength testing device is designed, including an induction circuit, a detection voltage determination circuit and a field strength indication circuit. The NFC field strength is detected by the induction coil, and the field strength is indicated by the indicator light assembly according to the number of lights and/or color. It has a simple structure and small size, making it easy to carry.
The application range of NFC field strength testing devices has been expanded, especially in occasions where accuracy requirements are not high, the structure is simple and portable.
Smart Images
Figure CN223139714U_ABST
Abstract
Description
Technical Field
[0001] The utility model generally relates to the technical field of field strength testing. More specifically, the utility model relates to an NFC field strength testing device. Background Art
[0002] With the continuous development of the NFC (Near Field Communication) field, the quality of NFC performance directly affects the overall quality of NFC products. Therefore, a simple and portable NFC field strength detection tool becomes particularly important. Usually, the NFC performance of each NFC device can be accurately understood through the detection of the detection tool.
[0003] Traditional NFC field strength meters have the characteristics of large volume, complex structure, and cumbersome operation process, which are not convenient for carrying and using. Therefore, for some occasions with not too high requirements for detection accuracy, the applicability of this kind of field strength meter is poor.
[0004] In view of this, there is an urgent need to provide an NFC field strength testing device with a simple structure, a relatively small volume, and being convenient for carrying, so that it has stronger adaptability compared with the above-mentioned traditional NFC field strength meters. Summary of the Utility Model
[0005] In order to at least solve the above-mentioned technical problems, the utility model proposes an NFC field strength testing device.
[0006] The utility model provides an NFC field strength testing device, including: an induction circuit, the induction circuit at least includes an induction coil, and the induction circuit is used for: detecting the NFC field strength to obtain a sampling voltage; and storing the energy obtained by detecting the NFC field strength through the induction coil; and a detection voltage determination circuit, the detection voltage determination circuit is electrically connected to the induction circuit and is used for processing the sampling voltage to obtain a detection voltage corresponding to the NFC field strength; and a field strength indication circuit, the field strength indication circuit at least includes an indicator lamp assembly with a plurality of indicator lamps and is connected to the detection voltage determination circuit to obtain a field strength indication result corresponding to the NFC field strength according to the number of lit indicator lamps and / or colors of the plurality of indicator lamps.
[0007] In some embodiments, the induction coil is used for detecting the NFC field strength to obtain an alternating current induction voltage; the induction circuit further includes a rectification circuit, the rectification circuit is respectively electrically connected to the induction coil and the detection voltage determination circuit, and the rectification circuit is used for rectifying the alternating current induction voltage to obtain a first direct current voltage.
[0008] In some embodiments, the induction circuit further includes a voltage stabilizing circuit, which is electrically connected to the rectifying circuit and the detection voltage determination circuit respectively and is used for stabilizing the first DC voltage to obtain a stable second DC voltage.
[0009] In some embodiments, the induction circuit further includes a filtering circuit, which is electrically connected to the voltage stabilizing circuit and the detection voltage determination circuit respectively, and the filtering circuit is used for filtering at least part of the AC components in the stable DC voltage to obtain a third DC voltage.
[0010] In some embodiments, the induction circuit further includes a voltage dividing circuit, which is electrically connected to the filtering circuit and the detection voltage determination circuit respectively and is used for dividing the third DC voltage to obtain the sampling voltage suitable for the detection voltage determination circuit.
[0011] In some embodiments, it further includes a connection circuit for transmitting the AC induction voltage to the rectifying circuit, and the connection circuit includes a resistor and is electrically connected to the induction coil and the rectifying circuit respectively.
[0012] In some embodiments, the detection voltage determination circuit is further used for performing analog-to-digital conversion on the sampling voltage to obtain the detection voltage.
[0013] In some embodiments, the detection voltage determination circuit is further used for generating a driving signal according to the detection voltage;
[0014] The NFC field strength testing device further includes a field strength indication circuit, which is electrically connected to the detection voltage determination circuit and is used for correspondingly indicating the NFC field strength condition according to the driving signal.
[0015] In some embodiments, the field strength indication circuit includes a display screen.
[0016] In some embodiments, the indicator lamp assembly includes a plurality of indicator lamps and a plurality of voltage limiting resistors. The indicator lamp assembly is used for driving each indicator lamp in the indicator lamp assembly to present a lit or off state, or present a corresponding brightness or color according to the driving signal to indicate the magnitude of the NFC field strength. Among them, the plurality of voltage limiting resistors are used for limiting the voltage of the detection voltage to obtain a detection voltage suitable for the plurality of indicator lamps.
[0017] In some embodiments, the indicator lamp assembly includes a plurality of cascaded indicator lamp modules, and each indicator lamp module includes at least one of the plurality of indicator lamps and at least one of the plurality of voltage limiting resistors.
[0018] Through the NFC field strength testing device provided above, which only includes an induction circuit, a detected voltage determination circuit, and a field strength indication circuit, it has a simple structure and a small volume, thus being convenient to carry. Due to these advantages, the application scope of the NFC field strength testing device of this solution is relatively wider than that of traditional NFC field strength meters, especially more adaptable to occasions with not too high precision requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:
[0020] Figure 1 The principle block diagram of the NFC field strength testing device of some embodiments of the present utility model is shown;
[0021] Figure 1-1 The specific circuit diagram of the NFC field strength testing device of some embodiments of the present utility model is shown;
[0022] Figure 1-2 The specific circuit diagram of the NFC field strength testing device of some other embodiments of the present utility model is shown;
[0023] Figure 2 The principle block diagram of the NFC field strength testing device of some other embodiments of the present utility model is shown;
[0024] Figure 3 The principle block diagram of the NFC field strength testing device of some other embodiments of the present utility model is shown;
[0025] Figure 4 The principle block diagram of the NFC field strength testing device of some other embodiments of the present utility model is shown;
[0026] Figure 5 The principle block diagram of the NFC field strength testing device of some embodiments of the present utility model is shown;
[0027] Figure 6 The principle block diagram of the NFC field strength testing device of some embodiments of the present utility model is shown;
[0028] Figure 7 The principle block diagram of the NFC field strength testing device of some embodiments of the present utility model is shown;
[0029] Figure 8 The principle block diagram of the indicator lamp assembly in the NFC field strength testing device of some embodiments of the present utility model is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.
[0031] It should be understood that the terms "including" and "comprising" used in the specification and claims of the present utility model indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.
[0032] It should also be understood that the terms used in the specification of the present utility model are merely for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the specification and claims of the present utility model, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms. It should be further understood that the term "and / or" used in the specification and claims of the present utility model refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0033] As used in this specification and the claims, the term "if" can be interpreted according to the context as "when", "once", "in response to determining", or "in response to detecting". Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted according to the context as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]".
[0034] The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
[0035] Figure 1 The principle block diagram of the NFC field strength test device 100 according to some embodiments of the present utility model is shown.
[0036] As Figure 1As shown in the figure, the NFC field strength testing device 100 may include an induction circuit 101, a detected voltage determination circuit 102, and a field strength indication circuit 103. In one embodiment, the induction circuit 101 may at least include an induction coil 110. Based on different application scenarios, the induction coil 110 may include an air-core coil, an iron-core coil, or a transformer coil. The field strength indication circuit at least includes an indicator lamp assembly 120 having a plurality of indicator lamps and is connected to the detected voltage determination circuit to obtain a field strength indication result corresponding to the NFC field strength according to the number of lit indicator lamps and / or colors. In one embodiment, the induction circuit 101 may be used to detect the NFC field strength to obtain a sampled voltage, and store the energy obtained by detecting the NFC field strength through the induction coil 110. In this embodiment, the induction circuit 101 may detect the NFC field strength through the induction coil 110 and obtain an alternating current induction voltage. If the detected voltage determination circuit 102 needs to collect a direct current sampled voltage, the induction circuit 101 may further perform an AC-DC conversion on the alternating current induction voltage induced by the induction coil 110, which will be described in detail later.
[0037] In one embodiment, the detected voltage determination circuit 102 may be electrically connected to the induction circuit 101 and is used to process the sampled voltage to obtain a detected voltage corresponding to the NFC field strength. For voltage sampling, the detected voltage determination circuit 102 may be used to perform an analog-to-digital conversion on the sampled voltage to obtain the detected voltage. In one implementation scenario, the detected voltage determination circuit 102 may include, but is not limited to, Figure 1-1 the microcontroller unit (MCU) 130-6 having an analog-to-digital conversion function as shown in the figure. Further, the detected voltage determination circuit 102 may include one or more voltage detection chips connected in parallel, and multiple different models of voltage detection chips may be included among the multiple voltage detection chips connected in parallel. For voltage acquisition, the voltage detection chip may include an AD conversion chip (analog-to-digital conversion chip). The NFC field strength testing device may further include a power supply module (such as Figure 1-1 VCC 130-7 in the figure), which may be connected to the detected voltage determination circuit 102 (such as the MCU) to supply power to it.
[0038] In one embodiment, the detected voltage may be divided into multiple voltage intervals, and multiple field strength intervals may be set for the NFC field strength, and a corresponding relationship between the two may be established according to the relationship between the magnitude of the detected voltage and the magnitude of the NFC field strength, so as to facilitate determining the field strength interval of the NFC field strength according to the voltage interval where the detected voltage is located. For example, three voltage intervals, namely the first, second, and third, may be set, and three field strength intervals, namely the first, second, and third, may be set, and it may be determined that the first voltage interval corresponds to the first field strength interval, the second voltage interval corresponds to the second field strength interval, and the third voltage interval corresponds to the third field strength interval.
[0039] It is understandable that the division of the detection voltage into three voltage intervals and the NFC field strength into three field strength intervals is merely exemplary rather than restrictive. Based on different requirements, the detection voltage can also be divided into more (such as four, five, or six) or fewer (such as two) voltage intervals, and the NFC field strength can be adaptively divided into more (such as four, five, or six) or fewer (such as two) field strength intervals.
[0040] As can be seen from the above description, the NFC field strength testing device of this solution only includes the induction circuit 101 and the detection voltage determination circuit 102. Therefore, it has a simple structure and a small volume, making it convenient to carry. Due to these advantages, the application range of the NFC field strength testing device of this solution is relatively wider than that of traditional NFC field strength meters, especially more adaptable to occasions with not too high precision requirements.
[0041] To show the specific circuit connections and component layouts of each functional module in the principle block diagram, the present utility model shows the specific circuit diagram of the optional NFC field strength testing device, as Figure 1-1 and Figure 1-2 shown.
[0042] It should be noted that Figure 1-2 corresponding to each module in Figure 1-1 , the VCC power module in Figure 1-2 is also the VCC 130-7 in Figure 1-1 , the MCU module in Figure 1-2 is also the MCU 130-6 in Figure 1-1 , the voltage division circuit in Figure 1-2 is also the 130-5 in Figure 1-1 , the filter circuit in Figure 1-2 is also the 130-4 in Figure 1-1 , the rectifier circuit in Figure 1-2 is also the 130-3 in Figure 1-1 , the connection circuit in Figure 1-2 is also the 130-2 in Figure 1-1 , the coil in Figure 1-2 is also the 130-1 in Figure 1-1 , the display screen in Figure 1-2 is also the VA screen 130-8 in Figure 1-1 . The difference in the module is the LED lamp in Figure 1-2 . Further, Figure 1-1 illustrates that the field strength indication circuit can include a display screen, such as the VA screen 130-8, for indicating the NFC field strength through various indication methods such as specific values (such as displaying the interval of the NFC field strength) and / or charts; Figure 1-2 illustrates that the field strength indication circuit can include, in addition to a display screen, an LED lamp (i.e., the aboveFigure 1 in the indicator light assembly 120 in
[0043] In some application scenarios, the sampling voltage can be a DC detection voltage. In this case, it is necessary to rectify the AC induction voltage obtained by the induction coil 110. The following is an explanation of the NFC field strength test device including the rectification process in combination with Figure 2 to illustrate the NFC field strength test device including the rectification process.
[0044] Figure 2 The principle block diagram of the NFC field strength test device 200 according to some other embodiments of the present invention is shown.
[0045] As Figure 2 shown in Figure 1 The difference between this embodiment and the embodiment shown in
[0046] is only that the induction circuit 101 further includes a rectification circuit 111, which can be electrically connected to the induction coil 110 and the detection voltage determination circuit 102 respectively and is used to rectify the AC induction voltage to obtain a DC voltage. Figure 1-1 In an implementation scenario, the rectification circuit 111 can include the existing circuit 130-2 composed of diodes shown in
[0047] which can utilize the unidirectional conductivity of the diodes to convert the positive and negative alternating AC induction voltage into a unidirectional pulsating DC voltage. The rectification circuit 111 can also adopt other existing circuit structures, and the present invention does not limit this. Figure 3 to illustrate the NFC field strength test device including the voltage regulation process.
[0048] Figure 3 The principle block diagram of the NFC field strength test device 300 according to some other embodiments of the present invention is shown.
[0049] As Figure 3 shown in Figure 2 The difference between this embodiment and the embodiment shown in Figure 1-1The voltage stabilization circuit in (130 - 3). According to specific circuit requirements, this solution can select a voltage stabilizing diode of a suitable model to prevent the breakdown of subsequent devices. The voltage stabilization circuit 112 can also adopt other existing circuit structures, and the present utility model does not limit this.
[0050] Figure 4 The principle block diagram of the NFC field strength testing device 400 according to some other embodiments of the present utility model is shown.
[0051] As Figure 4 shown in, the difference between this embodiment and the embodiment shown in Figure 3 is only that the induction circuit 101 further includes a filtering circuit 113, which is electrically connected to the voltage stabilization circuit 112 and the detection voltage determination circuit 102 respectively and is used to filter out the AC component in the stable DC voltage to obtain the target DC voltage. In the embodiment shown in Figure 1-1 , the filtering circuit 113 can adopt an existing capacitor filtering circuit 130 - 4. Through filtering, the ripple coefficient of the above-mentioned stable DC voltage can be reduced, so that its waveform becomes relatively smooth, and then it is convenient to obtain a more accurate sampling voltage. The filtering circuit 113 can also adopt other existing circuit structures, and the present utility model does not limit this.
[0052] In order to obtain a sampling voltage suitable for the detection voltage determination circuit 102, in some embodiments, the sampled voltage can also be subjected to voltage division processing. Below, this solution will be described in combination with Figure 5 to illustrate the NFC field strength testing device including voltage division processing.
[0053] Figure 5 The principle block diagram of the NFC field strength testing device 500 according to some embodiments of the present utility model is shown.
[0054] As Figure 5 shown in, the difference between this embodiment and the embodiment shown in Figure 4 is only that the induction circuit 101 further includes a voltage division circuit 114, which is electrically connected to the filtering circuit 113 and the detection voltage determination circuit 102 respectively and is used to divide the target DC voltage to obtain a detection voltage suitable for the detection voltage determination circuit 102. In one implementation, the voltage division circuit 114 can include Figure 1-1 the existing resistor voltage division circuit 130 - 5 in, and through voltage division, the sampling voltage can meet the magnitude requirement of the detection voltage determination circuit 102. The voltage division circuit 114 can also adopt other existing circuit structures, and the present utility model does not limit this.
[0055] In order to adapt to different application scenarios, it is usually necessary to replace different types of induction coils 110. For the convenience of replacement, in one embodiment, the NFC field strength testing device can further include a connection circuit 115 (such asFigure 1-1 The connection circuit 130-2) therein, which may include a resistor 116 and is electrically connected to the induction coil 110 and the rectification circuit 111 respectively, is used to transmit the AC induction voltage to the rectification circuit 111. The structure of the connection circuit 115 may be as shown in Figure 1-1 including two resistors as shown, each resistor being connected to a wire, one of the two wires connecting one terminal of the induction coil 110 and the rectification circuit 111, and the other wire connecting the other terminal of the induction coil 110 and the rectification circuit 111. When replacing the induction coil 110 ( Figure 1-1 the induction coil 130-1) in it, it is only necessary to disconnect the connection between the induction coil 110 and the corresponding resistor, so that the replacement of the induction coil 110 is relatively convenient.
[0056] In order to intuitively and clearly understand the magnitude of the NFC field strength, in one embodiment, the NFC field strength test device can also indicate the NFC field strength. Hereinafter, the present solution will be described in conjunction with Figure 6 to illustrate the NFC field strength test device including the field strength indication circuit 103.
[0057] Figure 6 shows a schematic block diagram of the NFC field strength test device 600 according to some embodiments of the present invention.
[0058] As shown in Figure 6 this embodiment is only different from the embodiment shown in Figure 5 that the detection voltage determination circuit 102 can also be used to generate a driving signal according to the detection voltage, and the field strength indication circuit 103 is electrically connected to the detection voltage determination circuit 102 and is used to make corresponding indications according to the driving of the driving signal.
[0059] In one implementation, the field strength indication circuit 103 may include a display screen 117, such as a VA (Vertical Alignment) screen ( Figure 1-1 the VA screen 130-8) in it. The VA screen can display the NFC field strength in various display modes such as specific values (for example, showing the range of the NFC field strength) and / or charts. The VA screen has a higher contrast ratio, can produce deeper black and brighter white, so that the displayed image can be clearer, and thus the magnitude of the NFC field strength can be understood more clearly. In addition, the price of the VA screen is lower than that of the IPS (In-Plane-Switching) screen. Using it as the field strength indication circuit 103 can reduce the cost of the NFC field strength test device. In another implementation, the field strength indication circuit 103 may also include other display screens.
[0060] In addition to the above display screen 117, the field strength indication circuit 103 can also indicate the magnitude of the NFC field strength through the indicator light assembly 120 and its related circuits.
[0061] In one embodiment, the indicator light assembly 120 can include only one indicator light, which is used to present a corresponding brightness or color according to the drive signal.
[0062] For the corresponding relationship between the voltage range of the detected voltage and the field strength range of the NFC field strength described above, the brightness and color of the indicator light can be set corresponding to the voltage range of the detected voltage and the field strength range of the NFC field strength. For example, for the case including three voltage ranges and three field strength ranges, the first brightness with a relatively dim value or the color yellow can be set to correspond to the first voltage range and the first field strength range, the second brightness with a medium value or the color green can be set to correspond to the second voltage range and the second field strength range, and the third brightness with a relatively large value or the color red can be set to correspond to the third voltage range and the third field strength range.
[0063] Thus, the detection voltage determination circuit 102 can generate a corresponding drive signal according to the voltage range where the detected voltage is located. For example, when the detected voltage is in the first voltage range, a first drive signal is generated to drive the indicator light to present the first brightness or yellow, and at this time, it is determined that the NFC field strength is in the first field strength range; when the detected voltage is in the second voltage range, a second drive signal is generated to drive the indicator light to present the second brightness or green, and at this time, it is determined that the NFC field strength is in the second field strength range; when the detected voltage is in the third voltage range, a third drive signal is generated to drive the indicator light to present the third brightness or red, and at this time, it is determined that the NFC field strength is in the third field strength range. This way of displaying through brightness or color can intuitively and clearly indicate the magnitude of the NFC field strength.
[0064] Figure 7 The principle block diagram of the NFC field strength test device 700 according to some embodiments of the present invention is shown.
[0065] In another embodiment, the indicator light assembly 120 can further include a plurality of indicator lights 121 and a plurality of voltage limiting resistors 122, and the indicator light assembly is used to drive each indicator light in the indicator light assembly to present a lit or off state, or to present a corresponding brightness or color according to the drive signal, so as to indicate the magnitude of the NFC field strength. Among them, the plurality of voltage limiting resistors 122 are used to limit the voltage of the detected voltage to obtain a detected voltage suitable for the plurality of indicator lights 121.
[0066] The connection of the plurality of indicator lights 121 (such as D8 - D13) and the plurality of voltage limiting resistors 122 (such as R1 - R6) in the indicator light assembly 120 connected to the detection voltage determination circuit 102 is as Figure 8As shown, a plurality of voltage-limiting resistors 122 exist in series, and an indicator light (such as an LED) is connected between every two voltage-limiting resistors and grounded. For example, an indicator light D8 is connected and grounded at the middle position between the voltage-limiting resistors R1 and R2, an indicator light D9 is connected and grounded at the middle position between the voltage-limiting resistors R2 and R3, an indicator light D10 is connected and grounded at the middle position between the voltage-limiting resistors R3 and R4, an indicator light D11 is connected and grounded at the middle position between the voltage-limiting resistors R4 and R5, an indicator light D12 is connected and grounded at the middle position between the voltage-limiting resistors R5 and R6, and finally an indicator light D12 is connected and grounded at the tail of the voltage-limiting resistor R6.
[0067] In one implementation, the above-mentioned indicator light assembly further includes a plurality of cascaded indicator light modules, and each indicator light module includes at least one of the above-mentioned plurality of indicator lights and at least one of the above-mentioned voltage-limiting resistors. As Figure 8 shown, the indicator light module may include, for example, a module of the voltage-limiting resistor R1 and the indicator light D8, or may include, for example, a module of the voltage-limiting resistor R2 and the indicator light D9, etc.
[0068] When reflecting the magnitude of the NFC field strength by whether it is lit or not, indicator lights with different operating voltages can be selected to form the above-mentioned indicator light assembly, and the corresponding relationship between the lit indicator lights and the voltage range of the detected voltage and the field strength range of the NFC field strength can be set. For example, for the above-mentioned case including three voltage ranges and three field strength ranges, it can be set that only a small number of indicator lights are lit corresponding to the first voltage range and the first field strength range, a relatively large number of indicator lights are lit corresponding to the second voltage range and the second field strength range, and the largest number of indicator lights are lit (up to all lit) corresponding to the third voltage range and the third field strength range.
[0069] Thus, the detection voltage determination circuit 102 generates a corresponding drive signal according to the voltage range where the detected voltage is located. For example, when the detected voltage is in the first voltage range, a first drive signal is generated to drive two of the ten indicator lights to light up, and at this time it is determined that the NFC field strength is in the first field strength range; when the detected voltage is in the second voltage range, a second drive signal is generated to drive five of the ten indicator lights to light up, and at this time it is determined that the NFC field strength is in the second field strength range; when the detected voltage is in the third voltage range, a third drive signal is generated to drive nine or ten of the ten indicator lights to light up, and at this time it is determined that the NFC field strength is in the third field strength range. This method of indicating by the number of lit indicator lights can intuitively and clearly indicate the magnitude of the NFC field strength.
[0070] When reflecting the magnitude of the NFC field strength by different brightness levels, all the indicator lights in the indicator light assembly can be set to a relatively dim first brightness level corresponding to the above-mentioned first voltage range and first field strength range, a second brightness level in the middle corresponding to the above-mentioned second voltage range and second field strength range, and a relatively high third brightness level corresponding to the above-mentioned third voltage range and third field strength range as described above.
[0071] When reflecting the magnitude of the NFC field strength by different colors, all the indicator lights in the indicator light assembly can be set to yellow corresponding to the above-mentioned first voltage range and first field strength range, green corresponding to the above-mentioned second voltage range and second field strength range, and red corresponding to the above-mentioned third voltage range and third field strength range as described above.
[0072] It can be seen that using the above-mentioned indicator light assembly as the field strength indication circuit 103 allows for more indication methods compared to a single indicator light, thus making the indication methods more diverse. It is understandable that, in addition to the various indication methods described above, other indication methods can also be used to indicate the magnitude of the NFC field strength. For example, the magnitude of the NFC field strength can be indicated by combining brightness and color. For example, when the detected voltage is small, the brightness of the indicator light is dim and the color is yellow, and when the detected voltage is large, the brightness of the indicator light is bright and the color is red. Additionally, the field strength indication circuit 103 can also include light-emitting elements that exhibit different lighting states and / or colors based on different operating voltages. Furthermore, the field strength indication circuit can also include a VA screen and one of the indicator lights described above at the same time, or include a VA screen and an indicator light assembly composed of multiple indicator lights at the same time.
[0073] In the above, only the NFC field strength test device that performs NFC field strength indication based on the induction circuit 101 including multiple circuit structures such as a rectification circuit 111, a voltage stabilization circuit 112, a filtering circuit 113, and a voltage division circuit 114 is used as an example to illustrate the indication method of the field strength indication circuit 103. It is understandable that the field strength indication circuit 103 can also be added based on the induction circuit 101 only including an induction coil 110, including an induction coil 110 and a rectification circuit 111, including an induction coil 110, a rectification circuit 111, and a voltage stabilization circuit 112, and including an induction coil 110, a rectification circuit 111, a voltage stabilization circuit 112, and a filtering circuit 113, and the magnitude of the NFC field strength can be displayed according to the indication method described above, which will not be elaborated one by one here.
[0074] Although several embodiments of the present utility model have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can conceive of many changes, alterations, and alternative ways without departing from the spirit and concept of the present utility model. It should be understood that various alternative solutions to the embodiments of the present utility model described herein can be adopted in the practice of the present utility model. The appended claims are intended to define the scope of protection of the present utility model and thus cover equivalents or alternatives within the scope of these claims.
Claims
1. An NFC field strength testing device, characterized in that, Comprising: An induction circuit, the induction circuit at least includes an induction coil, and the induction circuit is configured to: Detect the NFC field strength to obtain a sampled voltage; And Store the energy obtained by detecting the NFC field strength through the induction coil; And A detected voltage determination circuit, the detected voltage determination circuit is electrically connected to the induction circuit and is configured to process the sampled voltage to obtain a detected voltage corresponding to the NFC field strength; And A field strength indication circuit, the field strength indication circuit at least includes an indicator lamp assembly having a plurality of indicator lamps and is connected to the detected voltage determination circuit to obtain a field strength indication result corresponding to the NFC field strength according to the number of lit indicator lamps and / or colors of the plurality of indicator lamps.
2. The NFC field strength testing device according to claim 1, wherein The induction coil is configured to detect the NFC field strength to obtain an alternating current induction voltage; The induction circuit further includes a rectification circuit, the rectification circuit is respectively connected to the induction coil and the detected voltage determination circuit, and the rectification circuit is configured to rectify the alternating current induction voltage to obtain a first direct current voltage.
3. The NFC field strength testing device according to claim 2, characterized in that The induction circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit is respectively electrically connected to the rectification circuit and the detected voltage determination circuit and is configured to perform voltage stabilizing processing on the first direct current voltage to obtain a second direct current voltage.
4. The NFC field strength testing device according to claim 3, wherein, The induction circuit further includes a filtering circuit, the filtering circuit is respectively electrically connected to the voltage stabilizing circuit and the detected voltage determination circuit, and the filtering circuit is configured to filter at least part of the alternating current components in the second direct current voltage to obtain a third direct current voltage.
5. The NFC field strength testing device according to claim 4, wherein The induction circuit further includes a voltage dividing circuit, the voltage dividing circuit is respectively electrically connected to the filtering circuit and the detected voltage determination circuit and is configured to divide the voltage of the third direct current voltage to obtain the sampled voltage suitable for the detected voltage determination circuit.
6. The NFC field strength testing device according to claim 2, characterized in that, It further includes a connection circuit for transmitting the alternating current induction voltage to the rectification circuit, the connection circuit includes a resistor and is respectively electrically connected to the induction coil and the rectification circuit.
7. The NFC field strength testing device according to claim 1, characterized in that, The detected voltage determination circuit is further configured to perform analog-to-digital conversion on the sampled voltage to obtain the detected voltage.
8. The NFC field strength testing device according to any one of claims 1-7, characterized in that The detected voltage determination circuit is further configured to generate a driving signal according to the detected voltage; The NFC field strength test device further includes a field strength indication circuit, the field strength indication circuit is electrically connected to the detected voltage determination circuit and is configured to perform corresponding indication on the NFC field strength condition according to the driving signal.
9. The NFC field strength testing device according to any one of claims 1-7, characterized in that The field strength indication circuit includes a display screen.
10. The NFC field strength testing device according to claim 8, wherein, The indicator lamp assembly includes a plurality of indicator lamps and a plurality of voltage limiting resistors, the indicator lamp assembly is configured to drive each indicator lamp in the indicator lamp assembly to present a lit or off state, or present a corresponding brightness or color according to the driving signal to indicate the magnitude of the NFC field strength, wherein, the plurality of voltage limiting resistors are configured to limit the voltage of the detected voltage to obtain a detected voltage suitable for the plurality of indicator lamps.
11. The NFC field strength testing device according to claim 10, characterized in that, The indicator lamp assembly includes a plurality of cascaded indicator lamp modules, and each indicator lamp module includes at least one of the plurality of indicator lamps and at least one of the plurality of voltage limiting resistors.