Signal conditioning unit and card reader equipment

Abstract

The embodiment of the invention discloses a signal conditioning unit and card reader equipment. The scheme comprises a coil antenna and a load circuit comprising a capacitor element; one end of the coil antenna is connected with one end of the load circuit, and the other end of the coil antenna is connected with the other end of the load circuit; the coil antenna and the load circuit are used for forming a resonance circuit; the resonance circuit is used for influencing the quality factor of the card reader equipment, so that the quality factor of the card reader equipment accords with or deviates from a preset quality factor; the preset quality factor is a preset working quality factor of the card reader equipment.

Description

Technical Field

[0001] The present application relates to the field of contactless communication technology, and in particular to a signal conditioning unit and a card reader device. Background Art

[0002] As contactless communication technology is increasingly used, various devices for contactless communication have emerged. Since the communication principles of devices for contactless communication are the same or similar, interference may occur in scenarios where multiple devices exist. For example, near-field communication (NFC) is a popular near-field communication technology. Currently, in the payment market, there are UnionPay's NFC near-field communication payment devices, such as POS machines, and bus card readers and other devices that serve as NFC card readers. At the same time, user terminals such as mobile phones are also used as carriers of NFC technology, and can also work in NFC's active mode or passive mode. There are many types of NFC devices. For example, multiple devices with NFC functions may be placed on a cash register at the same time, but different devices have different designs and standards to meet. Some transmit strong signals, some transmit weak signals, and some work in passive mode. When these devices are placed together, the devices will affect each other, making contactless communications such as NFC impossible to complete.

[0003] Therefore, it is necessary to provide a solution capable of adjusting the card reader device. Summary of the invention

[0004] The embodiments of the present specification provide a signal conditioning unit and a card reader device to solve the signal interference problem or the low recognition rate problem existing in the existing contactless communication.

[0005] To solve the above technical problems, the embodiments of this specification are implemented as follows.

[0006] A signal conditioning unit provided in an embodiment of the present specification is applied to a card reader device, including: a coil antenna and a load circuit including a capacitive element; One end of the coil antenna is connected to one end of the load circuit, and the other end of the coil antenna is connected to the other end of the load circuit; The coil antenna and the load circuit are used to form a resonant circuit; The resonant circuit is used to influence the quality factor of the card reader device so that the quality factor of the card reader device meets or deviates from a preset quality factor; the preset quality factor is a preset working quality factor of the card reader device.

[0007] A card reader device provided in an embodiment of the present specification includes the above-mentioned signal adjustment unit.

[0008] At least one embodiment of this specification can achieve the following beneficial effects: In an embodiment of the present specification, a signal conditioning unit capable of influencing a radiation signal of a card reader device is provided. The signal conditioning unit may include a coil antenna and a load circuit including a capacitive element, and a resonant circuit including the coil antenna and the load circuit may be used to influence a quality factor of the card reader device, so that the quality factor of the card reader device meets a preset quality factor or the quality factor of the card reader device deviates from the preset quality factor, thereby enhancing or weakening the radiation signal of the card reader device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 2 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 3 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 4 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 5 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 6 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 7 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Figure 8 This is a structural schematic diagram of a signal conditioning unit provided in an embodiment of this specification; Fig. 9 This is a schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solutions and advantages of one or more embodiments of this specification clearer, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of one or more embodiments of this specification.

[0012] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0013] The terms used in one or more embodiments of the present application are only for the purpose of describing a specific embodiment, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items. It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein can be interpreted as "at the time of..." or "when..." or "in response to determination".

[0014] First, the terms involved in one or more embodiments of the present application are explained.

[0015] Contactless communication refers to the technology of transmitting information without direct physical contact. It uses electromagnetic waves or other wireless signals to achieve data transmission and communication, avoiding the safety risks brought by physical contact. The core principle of contactless communication is to use radio waves or other electromagnetic waves to transmit information. The electromagnetic signal generated by the sender is received and decoded by the receiver, thereby completing the data transmission. Common contactless communication technologies mainly include near field communication (NFC), radio frequency identification (RFID) and wireless charging.

[0016] RFID (Radio Frequency Identification): The principle is to conduct non-contact data communication between the reader and the tag to achieve the purpose of identifying the target. There are different types of frequencies, such as low frequency, high frequency, ultra-high frequency, etc.

[0017] NFC (Near Field Communication) is a short-range wireless communication technology that can realize near-field communication between two devices, and realize data transmission, writing and reading, etc. It is usually used at a high frequency of 13.56MHz. NFC near-field communication is developed based on RFID radio frequency identification technology. NFC can be regarded as a subset of RFID, or NFC can be regarded as a special form of RFID.

[0018] NFC technology mainly includes three communication modes: Reader / Writer Mode, Card Emulation Mode, and Peer-to-Peer Mode.

[0019] Reader / Writer Mode is a common working mode, similar to barcode or QR code scanning. In this mode, NFC devices can read or write information to NFC tags or devices containing NFC tags. For example, in a payment scenario, a mobile phone can be in reader / writer mode to obtain payment information from the payment device for payment. Devices in this mode can be called card reader devices.

[0020] Card Emulation Mode In this mode, the NFC device can simulate a smart card, allowing it to be used as a payment card, access card, or other types of cards. The device can interact with existing contactless infrastructure, such as POS machines or access control systems. For example, use a mobile phone as a bank card to pay in a store; use a mobile phone as an access card in a company or residential area; use a mobile phone as a transportation card to take public transportation. A device in this mode can be called a slave device.

[0021] Peer-to-Peer Mode: In this mode, two NFC devices can exchange data with each other. Both devices must be active and able to send and receive data. It is mainly used for file transfer, social networking, game interaction, etc. For example, quickly pairing Bluetooth or Wi-Fi connection through NFC and then transferring files or photos; for example, exchanging business cards, contact information or social media links by tapping two mobile phones; for example, character exchange or prop sharing in multiplayer games, etc.

[0022] An NFC tag is a small electronic chip with a built-in antenna that can communicate with NFC-enabled devices (such as smartphones) over short distances via radio waves. These tags are usually very thin and small and can be embedded in a variety of items, such as posters, business cards, product packaging, equipment, etc.

[0023] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0024] Figure 1 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 1 As shown, the signal conditioning unit may include a coil antenna 102 and a load circuit 104. The coil antenna 102 may be an antenna including a metal coil, the load circuit 104 may be a circuit including a capacitor element, one end of the coil antenna 102 is connected to one end of the load circuit 104, and the other end of the coil antenna 102 is connected to the other end of the load circuit 104, so as to form a resonant circuit including the coil antenna 102 and the load circuit 104.

[0025] Card reader devices for contactless communication, such as access control devices, gate machines, POS machines, mobile phones, smart watches and other terminals can be used as card reader devices to perform contactless communication with corresponding tag devices. The resonant circuit including the coil antenna 102 and the load circuit 104 in the embodiment of this specification can be used to adjust the radiation power of the card reader device, such as enhancing the power of the card reader device to improve the communication function, or reducing the power of the card reader to reduce the signal interference of the card reader device to other contactless communication devices. Among them, the resonant circuit can affect the quality factor of the card reader device, so that the quality factor of the card reader device meets or deviates from the preset quality factor, which can be the preset working quality factor of the card reader device, or can be expressed as the standard quality factor of the card reader device. The specific value of the preset quality factor may vary according to the model or function of different card reader devices, and can be set according to actual needs.

[0026] The quality factor (Quality Factor), also known as the quality factor, can be expressed using the Q value. It can be used to describe the quality or resonance capability of a resonant circuit, revealing the contradictory relationship between the passband and selectivity of a resonant circuit. The larger the Q value, the narrower the passband width, the better the circuit's selectivity, and the stronger the rejection of non-signals; conversely, the smaller the Q value, the wider the passband width, the weaker the rejection of non-signals, the worse the selectivity, but the bandwidth contains more signals and the signal loss is small, which is conducive to reducing signal distortion.

[0027] In actual applications, in order to meet the needs of communication scenarios, appropriate quality data can be selected. For example, in the NFC near-field communication scenario, the Q value can be set to about 30, so that the card reader device can communicate with a 13.56MHz radio frequency signal and ensure a certain communication efficiency. The quality factor can be explained or calculated from dimensions such as energy, power, voltage, circuit parameters, and bandwidth. For details, please refer to the relevant technical introduction, which will not be repeated here.

[0028] As an implementation manner, the preset working quality factor may be 30, or may be a value or a value range of about 30, such as 30±2%.

[0029] In actual applications, if there are multiple or multiple contactless communication devices placed at a cashier counter, such as UnionPay cashier equipment, membership card readers, e-wallet reading equipment, etc. placed at the cashier counter, card reader devices working in active mode, and payment devices as NFC tag devices. The card reader device located in the cashier counter continuously sends out card-seeking signals, which may cause the tag device working in the same frequency band to respond to the card-seeking signal and feedback, which causes the tag device to respond incorrectly, causing interference, or the tag device cannot send low-power card detection LPCD wake-up information, affecting the wake-up effect of mobile phones and other terminals as card reader devices, and affecting communication efficiency. For example, when a user uses a mobile phone or other terminal close to a cashier counter or a card reader device, the state of the mobile phone or other terminal will switch to the card simulation mode, making it impossible for the mobile phone or other device to start the card reader mode to communicate with the tag device. For example, some card reader devices may use metal covers to block the signal, which will affect the transmission of radio frequency signals or communication efficiency.

[0030] Figure 1 The signal conditioning unit in the device can affect the strength of the radiation signal of the card reader device, and the resonant circuit including the coil antenna and the load circuit can be used to affect the quality factor of the card reader device, so that the quality factor of the card reader device meets the preset quality factor, which can enhance the radiation signal of the card reader device, increase the transmission power, and save power consumption. Alternatively, the resonant circuit of the signal conditioning unit makes the quality factor of the card reader device deviate from the preset quality factor, which can weaken the radiation signal of the card reader device and reduce the mutual crosstalk between different devices.

[0031] On the other hand, the signal conditioning unit provided in the embodiments of this specification may not add additional power supply and other related circuits, but may use simple circuits and coils, which is low in cost, does not affect other performances of the device, and is highly practical.

[0032] It should be understood that the connection sequence of at least some of the components of the signal conditioning unit described in one or more embodiments of this specification can be exchanged or adjusted according to actual needs, or some of the components can be omitted or deleted.

[0033] based on Figure 1 The signal conditioning unit of this specification also provides some specific implementation plans, which are described below.

[0034] The quality factor is a dimensionless physical value used to measure the performance of electronic devices or resonant circuits. It is a measure of the loss of electronic devices or resonant circuits and can represent the ratio of stored energy to energy loss within a cycle. Factors that affect the quality factor include resonant frequency, equivalent resistance, equivalent capacitance, equivalent inductance, etc.

[0035] In the embodiments of this specification, the quality factor of the card reader device can be affected by setting or adjusting the resonant frequency of the signal conditioning unit. As an implementation, if the resonant circuit is used to make the quality factor of the card reader device meet the preset quality factor, the resonant frequency of the resonant circuit is equal to the working resonant frequency of the card reader device.

[0036] The working resonant frequency of the card reader device can represent the frequency band in which the card reader device operates, such as the 13.56 MHz frequency band. The resonant frequency of the resonant circuit in the embodiments of this specification can also represent the resonant frequency of the signal conditioning unit. The resonant frequency is equal to the working resonant frequency of the card reader device, which can increase the transmission power of the card reader device and save power consumption.

[0037] In this specification, the signal adjustment unit can be applied to a card reader device. The quality factor of the card reader device under the influence of the signal adjustment unit can be the quality factor under the joint action of the signal adjustment unit and the card reader device. The card reader device and the signal adjustment unit can be subjected to circuit equivalent calculation to determine the specific value.

[0038] As a calculation method, the quality factor ; Wherein, R can represent the equivalent resistance value between the signal conditioning unit and the card reader device under the action of the signal conditioning unit, L can represent the equivalent inductance value between the signal conditioning unit and the card reader device under the action of the signal conditioning unit, and C can represent the equivalent capacitance value between the signal conditioning unit and the card reader device under the action of the signal conditioning unit.

[0039] In actual applications, the inductance, capacitance, and resistance of the card reader device itself can be determined based on the product description information of the card reader device, or determined by some testing methods. Further, the inductance, capacitance, and resistance of the signal conditioning unit under the preset quality factor can be determined based on the equivalent circuit of the signal conditioning unit and the card reader device, and the parameters or connection relationship of each component in the signal conditioning unit can be determined. The specific parameters of the signal conditioning unit can be set according to actual needs and are not specifically limited here.

[0040] Similarly, the parameters or connection relationships of the various components of the signal conditioning unit for deviating from the preset quality factor can also be determined according to the relationship of the above formula, and the signal conditioning unit can be used to reduce the power of the card reader device. The specific values ​​of the equivalent resistance value, the equivalent inductance value, and the equivalent capacitance value can be calculated based on the various components and connection relationships included in the signal conditioning unit and the card reader device, which can be referred to the relevant technical introduction and will not be repeated here.

[0041] As a calculation method, the resonant frequency of the resonant circuit of the signal conditioning unit is ;in, Indicates the inductance value of the resonant circuit, which can also be expressed by the equivalent inductance value; It represents the capacitance value of the resonant circuit, and can also be expressed as an equivalent capacitance value.

[0042] As an implementation, the resonant frequency of the signal conditioning circuit can be equal to the operating resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal circuit meets the preset quality factor. The signal conditioning circuit can be used to increase the radiation power of the card reader device.

[0043] As another embodiment, the resonant frequency of the signal conditioning circuit can be greater than or less than the operating resonant frequency of the card reader device, or, under the influence of the signal circuit, the quality factor of the card reader device meets the preset quality factor, and the signal conditioning circuit can be used to reduce the radiation power of the card reader device.

[0044] Taking the NFC radio frequency operating at 13.56MHz as an example, if the signal conditioning unit is used to increase the power of the card reader device, the relationship between the capacitance and inductance of the signal conditioning unit can be determined based on the above formula for calculating the resonant frequency and setting the resonant frequency to 13.56MHz. The parameter values ​​of the capacitance, inductance, resistance and other parameters of the signal conditioning unit can also be determined by combining the above formula for calculating the quality factor and the parameter values ​​of the capacitance, inductance and resistance and other parameters of the card reader device itself.

[0045] In practical applications, if the quality factor of the card reader device is less than or greater than the preset quality factor under the influence of the signal conditioning unit, the radiation power or transmission power of the card reader device can be reduced, and the interference of the card reader device to other devices can be reduced. The specific parameters of the signal conditioning unit can be determined according to the calculation formula for calculating the quality factor and the parameter information of the card reader device itself.

[0046] If the signal conditioning unit is used to reduce the power of the card reader device, the resonant frequency of the signal conditioning unit may be ignored, and the parameter value of the signal conditioning unit may be determined according to the quality factor. Of course, the resonant frequency of the signal conditioning unit may also be considered. For example, if the resonant frequency of the signal conditioning unit is equal to the working resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal conditioning unit is less than or greater than the preset quality factor, the signal conditioning unit may also be used to reduce the power of the card reader device; for another example, if the resonant frequency of the signal conditioning unit is greater than or less than the working resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal conditioning unit is less than or greater than the preset quality factor, the signal conditioning unit may also be used to reduce the power of the card reader device.

[0047] In order to more effectively adjust the radiation signal of the card reader device, the coil antenna of the signal adjustment unit can be matched with the antenna of the card reader device. For example, the shape, size, etc. of the coil antenna of the signal adjustment unit can be the same as or similar to the antenna of the card reader device, so that the coupling between the signal adjustment unit and the card reader device is strong. For example, the antenna of the card reader device is a rectangular coil, and the coil antenna of the signal adjustment unit can also be a rectangular coil, and the length, width, etc. of the two can also be the same or similar. The material of the coil antenna of the signal adjustment unit can also be the same as that of the antenna in a conventional NFC card or card reader device, or other materials that can form a resonant circuit can be used, which is not specifically limited here.

[0048] In practical applications, the signal conditioning unit can be fixed on the surface of the card reader device. For example, the signal conditioning unit can be located in the contactless communication area of ​​the card reader device, such as the card sticking area of ​​the card reader device. The signal conditioning unit can be fixed to the surface of the card reader device by non-punching methods such as pasting, card slot fixing, and adsorption, without modifying the card reader device. Alternatively, it can also be fixed to the surface of the card reader device by punching methods such as screws and rivets. Alternatively, the signal conditioning unit can also be fixed inside the card reader device. For example, the signal conditioning unit can be located near the contactless communication circuit part of the card reader device. Alternatively, the signal conditioning unit can also be integrated into the card reader device.

[0049] In actual applications, the signal conditioning unit can also be set separately from the card reader device. For example, the signal conditioning unit can be located on the desktop of the card reader device such as the cashier counter, and the card reader device can be placed on the desktop. For handheld card reader devices such as POS machines, when not in use, the cashier or operator can place the POS machine on the desktop containing the signal conditioning unit. If the signal conditioning unit is a circuit unit for reducing radiation power, when the card reader device is located on the desktop, the signal conditioning unit can weaken the radiation power of the card reader device, thereby reducing the signal interference of the card reader device to other devices. When the cashier or operator uses the card reader device to collect money and other services, picking up the card reader device from the desktop can restore the original power of the card reader device, so that normal communication and business processing can be carried out.

[0050] When the signal adjustment unit is applied to a card reader device, the coil antenna of the signal adjustment unit can be placed corresponding to the antenna coil of the card reader device, such as the center lines of the two coils coincide with or are close to each other, or the coil antenna of the signal adjustment unit and the antenna coil of the card reader device are placed coincidently, etc., which is conducive to the signal adjustment unit to adjust the card reader device more effectively.

[0051] In order to facilitate the use of the signal conditioning unit, a control component for controlling whether the signal conditioning unit is working can also be provided, so that the signal conditioning unit can be in an operable state or a non-operable state, thereby more accurately affecting the card reader device. As an embodiment, the signal conditioning unit further includes a first switch element; the first switch element is located between the coil antenna and the load circuit, and is used to control whether the signal conditioning unit is in an operable state.

[0052] Figure 2 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 2 As shown, the signal conditioning circuit may include a first switch element K1, one end s1 of the first switch element K1 is connected to one end of the coil antenna 102, and the other end is connected to one end of the load circuit 104, and is connected in series between the coil antenna 102 and the load circuit 104. If the first switch element K1 is in the on state, the circuit of the signal conditioning unit may be in the on state, which may indicate that the signal conditioning unit is in an operable state and may have an impact on the card reader device. If the first switch element K1 is in the off state, the circuit of the signal conditioning unit may be in the off state, which may indicate that the signal conditioning unit is in a non-operable state and may not have an impact on the card reader device.

[0053] In practical applications, the first switch element may be a mechanical switch element that can be used for manual operation. For example, the signal conditioning unit may be external or the card reader device may include a manual switch to control whether the signal conditioning unit affects the card reader device. Alternatively, the first switch element may be a switch element that is automatically triggered based on factors such as light source and pressure.

[0054] As an implementation, the first switching element includes a photosensitive switching element.

[0055] The photosensitive switch element may include at least one of a photoresistor, a photodiode, a phototransistor, a photothyristor, an integrated digital light sensor, and the like.

[0056] In practical applications, the signal conditioning unit can be placed in the contactless communication area of ​​the card reader device, such as the area used for identification with the corresponding tag or tag device. As an implementation method, if the signal conditioning unit can reduce the power of the card reader device, when there is no tag or tag device close to or attached to the identification area of ​​the card reader device, the light intensity is strong, the photosensitive switch element can be in the on state, and the signal conditioning unit can reduce the power of the card reader device. In the process of the tag or tag device close to or attached to the identification area of ​​the card reader device, the light near the photosensitive switch is blocked by the tag or tag device, the photosensitive switch element can be switched to the off state, the signal conditioning unit can have no effect on the card reader device, the normal use of the card reader device can be ensured, and the interference of the card reader device to other devices can be reduced.

[0057] As another implementation, if the signal conditioning unit can increase the power of the card reader device, when there is no tag entity or tag device close to or attached to the identification area of ​​the card reader device, the photosensitive switch element can be in a disconnected state, and the signal conditioning unit does not increase the power of the card reader device. When the tag or tag device is close to or attached to the identification area of ​​the card reader device, the photosensitive switch element can be in a conducting state, and the signal conditioning unit can affect the card reader device to increase the power of the card reader device, which is beneficial to improving the working efficiency of the card reader device, and can also prevent the card reader device from continuously sending a strong signal and interfering with other devices.

[0058] In practical applications, the state of the photosensitive switch element can be set according to actual needs. For example, a normally open photosensitive switch element can be turned on when the light is strong and turned off when the light is weak. A normally closed photosensitive switch element can be turned on when the light is weak and turned off when the light is strong.

[0059] The signal conditioning unit may also include an MCU microcontroller unit for controlling the on or off state of the first switch element. The MCU microcontroller unit may be connected to a tag device near the card reader device in communication. If the card reader device is close to the tag device, the tag device may determine that the card detection signal is an interference signal because the card reader device continuously sends a card detection signal. After determining that an interference signal exists, an instruction may be sent to the MCU microcontroller unit, so that the MCU microcontroller unit controls the signal conditioning unit to work, reduce the power of the card reader device, and reduce interference to the tag device.

[0060] The tag device may display or send out a prompt message indicating the presence of interference, such as voice, warning sound, text prompt, etc. If there is a manual switch in the card reader device or outside the signal conditioning unit to start the signal conditioning unit, the staff can also manually start the signal conditioning unit.

[0061] The tag device can refer to a device that is a communication partner of the card reader, and can contain tag information. For example, in a payment scenario based on NFC near-field communication, a payment device that provides payment information, etc., a mobile phone as a card reader device obtains and interacts with the payment device as a tag device to complete the payment.

[0062] The embodiments of this specification also provide various circuit structures of signal conditioning circuits. In practical applications, a suitable circuit structure can be selected according to actual needs. Various circuit structures are introduced below.

[0063] Optionally, in the embodiments of this specification, the capacitor element may include a first capacitor element, and the load circuit may further include a first inductor element, wherein the first inductor element may be connected in series with the coil antenna; and the first capacitor element may be connected in parallel with the coil antenna.

[0064] Figure 3 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 3 As shown, the load circuit 104 may include a first inductor L1 and a first capacitor C1. One end a1 of the first inductor L1 may be connected to one end A of the coil antenna 102, one end a2 of the first inductor L1 may be connected to one end b1 of the first capacitor C1, and the other end b2 of the first capacitor C1 may be connected to one end B of the coil antenna 102.

[0065] In practical applications, the first inductor element L1 and the first capacitive element C1 may also be connected in parallel with the coil antenna 102 .

[0066] The signal conditioning circuit may have one state or multiple states. As an implementation, the first inductor element L1 may be an element with a fixed inductance value, the signal conditioning circuit has one working state, and the signal conditioning circuit may be used to increase the power of the card reader device or reduce the power of the card reader device.

[0067] If the signal conditioning unit also includes the above-mentioned first switching element, the first switching element can be connected in series between the first inductance element and the coil antenna, or in series between the first inductance element and the first capacitance element, or in series between the first capacitance element and the coil antenna. The specific position can be set according to actual needs and is not limited here.

[0068] Optionally, in the embodiments of this specification, the capacitor element may include a second capacitor element; the second capacitor element may be connected in parallel with the coil antenna.

[0069] Figure 4 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 4 As shown, the load circuit 104 may include a second capacitor C2. One end c1 of the second capacitor C2 may be connected to one end A of the coil antenna 102, and the other end c2 of the second capacitor C2 may be connected to the other end B of the coil antenna 102. The coil antenna 102 may represent an inductor device, and the second capacitor C2 and the coil antenna 102 may be used to form a resonant circuit.

[0070] The second capacitive element may be an element with a fixed capacitance value, the signal conditioning circuit may have an operating state, and the signal conditioning circuit may be used to increase the power of the card reader device or reduce the power of the card reader device.

[0071] If the signal conditioning unit further comprises the first switch element, the first switch element may be connected in series between the second capacitor element and the coil antenna.

[0072] Optionally, in the embodiments of this specification, the load circuit may include a third capacitive element and a first resistive element. The third capacitive element may be connected in parallel with the coil antenna; and the first resistive element may be connected in parallel with the third capacitive element.

[0073] Figure 5 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 5 As shown, the load circuit 104 may include a third capacitive element C3 and a first resistive element R1 , wherein one end d1 of the third capacitive element C3 may be connected to one end A of the coil antenna 102 , and the other end d2 may be connected to the other end B of the coil antenna 102 .

[0074] The first resistive element R1 may be an element having a resistive property, such as a resistor, a light bulb, an electric heater, a motor, and the like.

[0075] As an embodiment, the first resistive element R1 may also be connected in series with the coil antenna. For example, one end e1 of the first resistive element R1 is connected to one end A of the coil antenna 102 , and the other end e2 is connected to one end d1 of the third capacitive element C3 , and the other end d2 of the third capacitive element C3 is connected to the other end B of the coil antenna 102 .

[0076] The first resistive element or the third capacitive element may be an element with a fixed resistance value or a fixed capacitance value, the signal conditioning circuit may have an operating state, and the signal conditioning circuit may be used to increase the power of the card reader device or reduce the power of the card reader device.

[0077] If the signal conditioning unit further includes the first switch element, the first switch element can be connected in series between the third capacitor element and the coil antenna. For example, one end of the first switch element can be connected to one end A of the coil antenna 102, and the other end can be connected to one end d1 of the third capacitor element C3.

[0078] In practical applications, the resonant circuit of the signal conditioning unit may also have an inductor or capacitor with adjustable function, so that the signal conditioning unit can have at least two states.

[0079] Optionally, the signal conditioning unit may further include a state control component, the first inductance element may include an adjustable inductance element, and the state control component may be connected to a first control end of the adjustable inductance element for controlling the inductance value of the adjustable inductance element so that the adjustable inductance element can be in a first state of a first inductance value or the adjustable inductance can be in a second state of a second inductance value.

[0080] Figure 6 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 6 As shown, the first inductor element L1 may include an adjustable inductor element. Figure 3 According to the connection relationship shown, the first control terminal a3 of the adjustable inductor element can be connected to the state control component 106, so that the state control component 106 can be used to adjust the inductance value of the adjustable inductor element in the circuit.

[0081] By adjusting the inductance value of the adjustable inductor in the circuit, the resonant circuit in the signal conditioning unit can be used to make the quality factor of the card reader device conform to or deviate from the preset quality factor. As an embodiment, in the first state, the resonant circuit can be used to make the quality factor of the card reader device conform to the preset quality factor; or, in the second state, the resonant circuit can be used to make the quality factor of the card reader device deviate from the preset quality factor.

[0082] Assuming that the adjustable inductance element is the first inductance value in the first state, the resonant frequency of the signal adjustment unit is equal to the operating frequency of the card reader device, such as 13.56MHz, and the quality factor of the card reader device based on the signal adjustment unit is equal to the preset quality factor, such as the Q value is 30, the coupling degree between the signal adjustment unit and the card reader device is high, which can improve the transmission efficiency, thereby increasing the transmission power and saving power. Assuming that the adjustable inductance element is the second inductance value in the second state, the second inductance value is greater than the first inductance value, and when other component parameters remain unchanged, the resonant frequency of the signal adjustment unit will become less than the operating frequency of the card reader device, such as changing to 11.12MHz, the coupling degree between the signal adjustment unit and the card reader device is reduced, and the radiation power of the card reader device is reduced under the influence of the signal adjustment unit, which can reduce the interference of the card reader device to other devices. And from the perspective of quality factor, the increase in the inductance value of the signal conditioning unit is equivalent to a decrease in the equivalent inductance value between the signal conditioning unit and the card reader device, which reduces the quality factor of the card reader device under the influence of the signal conditioning unit, and also reduces the radiation power of the card reader device and reduces the interference of the card reader device to other devices.

[0083] Of course, the first inductance value may also be greater than the second inductance value. The selection of the specific inductance value can be set according to actual needs and is not specifically limited here.

[0084] In practical applications, if the signal conditioning unit is a unit for increasing the power of the card reader device, the resonant circuits in the first state and the second state can be used to increase the power of the card reader device, but the power of the card reader device can be increased to different degrees, similar to multi-speed adjustment. For example, when the adjustable inductance element is the first inductance value, the resonant frequency of the signal conditioning unit conforms to the frequency range of the operating frequency of the card reader device, such as the frequency range of the card reader device is 13.56±0.7MHz, and the resonant frequency of the signal conditioning unit is 14MHz. And when the adjustable inductance element is the first inductance value, the quality factor of the card reader device on the basis of the signal conditioning unit conforms to the range of the preset quality factor, such as the range of the preset quality factor Q value is 30±1, and when the adjustable inductance element is the first inductance value, the quality factor of the card reader device on the basis of the signal conditioning unit is 30.5. Assuming that the second inductance value can also be greater than the first inductance value, when the adjustable inductance element is the second inductance value, the resonant frequency of the signal adjustment unit is changed to 13MHz, which is also in line with the frequency range of the operating frequency of the card reader device, and the quality factor is changed to 29.8, which is also in line with the preset quality factor of the card reader device. The power of the card reader device can be increased in both the first state and the second state.

[0085] Similarly, if the signal adjustment unit is a unit for reducing the power of the card reader device, the resonant circuit in the first state and the second state can be used to reduce the power of the card reader device, but the power of the card reader device can be reduced to different degrees, similar to multi-level adjustment to reduce power. The specific logical principle can be similar to the above introduction, and will not be repeated here.

[0086] If the signal conditioning unit further includes the above-mentioned first switch element, the first switch element can be connected in series between the adjustable inductor element and the coil antenna, or between the first capacitor element and the coil antenna. For example, one end of the first switch element can be connected to one end A of the coil antenna 102, and the other end can be connected to one end a1 of the adjustable inductor element. Alternatively, one end of the first switch element can be connected to the other end B of the coil antenna 102, and the other end can be connected to the other end b2 of the first capacitor element C1.

[0087] The state control component may be a component capable of adjusting the inductance value of the adjustable inductor, for example, the state control component may be a component capable of generating a digital signal, such as the state control component may include an envelope detection circuit, a half-wave rectifier circuit, etc. As an implementation, the state control component may include a digital signal conversion circuit, and an input end of the digital signal conversion circuit may be connected to the coil antenna to output a digital level signal.

[0088] The state control component 106 can be connected to the coil antenna 102, and can convert the radio frequency pulse signal sensed by the coil antenna 102 from the card reader device into a digital level signal. The digital level signal can be used to control the inductance value of the adjustable inductor element in the circuit, so that the card reader device can be in the first state or the second state under the influence of the signal adjustment unit.

[0089] As another implementation, the state control component may include an MCU micro control unit for adjusting the state of the resonant circuit.

[0090] Specifically, if the card reader device meets the signal enhancement condition, the micro control unit controls the resonant circuit to be in a state of enhancing the power of the card reader device; or, if the card reader device meets the signal weakening condition, the micro control unit controls the resonant circuit to be in a state of weakening the power of the card reader device.

[0091] Among them, the signal enhancement conditions include at least one of the following: the card reader device is in a working state, other entities exist within a preset range of the card reader device, and the card reader device fails to successfully obtain tag information; the signal weakening conditions include at least one of the following: the card reader device is in an idle state or a standby state, and the MCU microcontroller unit obtains an adjustment instruction sent by a device serving as an NFC tag; the adjustment instruction is generated after the device serving as an NFC tag senses a radio frequency interference signal.

[0092] The MCU microcontroller unit may store a logic program for adjusting the state of the resonant circuit, such as a logic program for adjusting an adjustable inductor.

[0093] For example, when the card reader device is picked up or detects that there is an object near the card reader device or the card reader device is in a non-standby state or working state, the MCU micro-control unit can control the adjustable inductance element to switch to the first state to increase the transmission power of the card reader device. For another example, when the card reader device is placed or detects that there is no object near the card reader device or the card reader device is in a standby state or idle state, the MCU micro-control unit can control the adjustable inductance element to switch to the second state to reduce the transmission power of the card reader device and reduce the interference of the card reader device to other devices.

[0094] For another example, the MCU microcontroller unit can communicate with other devices. For example, a card reader device and a device that serves as an NFC tag are deployed on the same cash register. Since the card reader device will continuously send a card-seeking signal, if the device that serves as an NFC tag is close to the card reader device, the device that serves as an NFC tag may respond to the card-seeking signal and cause interference. As an implementation method, the MCU microcontroller unit can communicate with the device that serves as an NFC tag. If the device that serves as an NFC tag senses a radio frequency interference signal, such as if the device that serves as an NFC tag continuously senses a card-seeking signal within a preset time period, the device that serves as an NFC tag can determine that there is an interference signal, and can send an instruction to the MCU microcontroller unit for reducing the interference. Based on the instruction, the MCU microcontroller unit can control the adjustable inductance element to switch to the second state to reduce the power of the card reader device.

[0095] As another implementation, the state control component may include a manual adjustment element, such as a button, a knob, etc., and the state of the resonant circuit may also be adjusted manually. For example, the inductance value of the adjustable inductor element may be manually adjusted to adjust the power of the card reader device.

[0096] In actual applications, if the MCU microcontroller unit requires a working power supply, the power supply can be set in the signal conditioning unit, or the card reader device can provide power. It can be set according to actual needs and is not limited here.

[0097] In the embodiments of this specification, an adjustable capacitor may also be used to enable the signal conditioning unit to have at least two states. Optionally, the signal conditioning unit may also include a state control component; the second capacitor may include an adjustable capacitor; the state control component is connected to the second control end of the adjustable capacitor, so that the adjustable capacitor can be in a third state of the first capacitance value or in a fourth state of the second capacitance value.

[0098] Figure 7 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 7 As shown, the second capacitor C2 may include an adjustable inductor element. Figure 4 According to the connection relationship shown, the second control terminal c3 of the adjustable capacitor element can be connected to the state control component 106, so that the state control component 106 can be used to adjust the capacitance value of the adjustable capacitor element in the circuit.

[0099] If the signal conditioning unit further comprises the first switch element, the first switch element may be connected in series between the adjustable capacitance element and the coil antenna. For example, one end of the first switch element may be connected to one end A of the coil antenna 102, and the other end may be connected to one end c1 of the adjustable capacitance element C2.

[0100] By adjusting the capacitance value of the adjustable capacitance element in the circuit, the resonant circuit in the signal conditioning unit can be used to make the quality factor of the card reader device conform to or deviate from the preset quality factor. As an embodiment, in the third state, the resonant circuit can be used to make the quality factor of the card reader device conform to the preset quality factor; or, in the fourth state, the resonant circuit can be used to make the quality factor of the card reader device deviate from the preset quality factor.

[0101] Similar to the above-mentioned use of an adjustable inductance element to adjust the state of the load circuit, in this embodiment, different effects on the card reader device can be achieved by adjusting the capacitance value of the load circuit.

[0102] Assuming that the adjustable capacitance element in the third state is the first capacitance value, the resonant frequency of the signal adjustment unit is equal to the operating frequency of the card reader device, such as 13.56MHz, and the quality factor of the card reader device based on the signal adjustment unit is equal to the preset quality factor, such as the Q value is 30, the coupling degree between the signal adjustment unit and the card reader device is high, which can improve the transmission efficiency, thereby increasing the transmission power and saving power. Assuming that the adjustable capacitance element in the fourth state is the second inductance value, the second capacitance value is greater than the first capacitance value, and when other component parameters remain unchanged, the resonant frequency of the signal adjustment unit will become less than the operating frequency of the card reader device, such as changing to 11MHz, the coupling degree between the signal adjustment unit and the card reader device is reduced, and the radiation power of the card reader device is reduced under the influence of the signal adjustment unit, which can reduce the interference of the card reader device to other devices. And from the perspective of quality factor, the increase in the capacitance value of the signal adjustment unit is equivalent to a decrease in the equivalent capacitance value of the signal adjustment unit and the card reader device, so that the quality factor of the card reader device increases under the influence of the signal adjustment unit and is greater than the preset quality factor. It will also reduce the radiation power of the card reader device and reduce the interference of the card reader device to other devices.

[0103] Of course, the first capacitance value may also be greater than the second capacitance value. The specific capacitance value may be set according to actual needs and is not specifically limited here.

[0104] If the signal conditioning unit is a unit for reducing the power of the card reader device, the resonant circuit in the third state and the fourth state can be used to reduce the power of the card reader device. Alternatively, if the signal conditioning unit is a unit for increasing the power of the card reader device, the resonant circuit in the third state and the fourth state can be used to increase the power of the card reader device. The specific principle is similar to that of the above embodiment and will not be repeated here.

[0105] The state control component in this embodiment can be used to control the capacitance value of the adjustable capacitor, and can be a digital signal conversion circuit, or can also be an MCU microcontroller unit. The specific working principle or processing logic can be the same or similar to the state control component in the aforementioned embodiments, and will not be repeated here.

[0106] In practical applications, the inductance, capacitance or resistance in the load circuit can also be adjusted by a controllable switch. Optionally, the signal adjustment unit also includes a state control component. The load circuit also includes a second switch element; the third control end of the second switch element is connected to the state control component, and the state control component is used to control the state of the second switch element. The second capacitor element includes a first fixed capacitor element and a second fixed capacitor element; the second switch element is connected in series with the first fixed capacitor element and then connected in parallel with the second fixed capacitor element; the second fixed capacitor element is connected in parallel with the coil antenna.

[0107] Figure 8 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Figure 8 As shown, the load circuit 104 may include a second switch element K2, a first fixed capacitor C21, and a second fixed capacitor C22. One end e1 of the second fixed capacitor C22 may be connected to one end A of the coil antenna, and the other end e2 may be connected to one end B of the coil antenna. One end g1 of the second switch element K2 is connected to one end f2 of the first fixed capacitor element C21, and the other end g2 is connected to the other end e2 of the second fixed capacitor element C22; the other end f1 of the first fixed capacitor C21 is connected to one end e1 of the second fixed capacitor C22. The third control end g3 of the second switch element K2 is connected to the state control component 106. The state control component 106 can control the switch state of the second switch element K2.

[0108] As an embodiment, when the second switch element is in a closed state, the resonant circuit of the signal adjustment unit can be used to make the quality factor of the card reader device conform to the preset quality factor; when the second switch element is in an open state, the resonant circuit is used to make the quality factor of the card reader device deviate from the preset quality factor.

[0109] For example, when the second switch is in a closed state, the operable elements in the resonant circuit of the signal adjustment unit include the first fixed capacitor element, the second fixed capacitor element, and the coil antenna. Assuming that in this state, the resonant frequency of the resonant circuit is equal to the working resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal adjustment unit is equal to the preset quality factor, that is, when the second switch is in a closed state, the signal adjustment unit can be used to make the quality factor of the card reader device meet the preset quality factor, thereby improving the transmission power of the card reader device. After the second switch is switched to an open state, the operable elements in the resonant circuit of the signal adjustment unit include the second fixed capacitor element and the coil antenna. Compared with when the second switch is in a closed state, the capacitance value of the resonant circuit becomes smaller, the resonant frequency of the resonant circuit becomes greater than the working resonant frequency of the card reader device, and under the influence of the signal adjustment unit, the quality factor of the card reader device becomes greater than the preset quality factor, exceeding the standard quality factor of the card reader device, that is, when the second switch element is in an open state, the signal adjustment unit can be used to make the quality factor of the card reader device deviate from the preset quality factor, thereby affecting the transmission power of the card reader device.

[0110] As another embodiment, when the second switch element is in an open state, the resonant circuit of the signal adjustment unit can be used to make the quality factor of the card reader device conform to a preset quality factor; when the second switch element is in a closed state, the resonant circuit is used to make the quality factor of the card reader device deviate from the preset quality factor.

[0111] For example, when the second switch is in the open state, the operable elements in the resonant circuit of the signal adjustment unit include the second fixed capacitor element and the coil antenna. Assuming that in this state, the resonant frequency of the resonant circuit is equal to the working resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal adjustment unit is equal to the preset quality factor, that is, when the second switch is in the open state, the signal adjustment unit can be used to make the quality factor of the card reader device meet the preset quality factor, thereby improving the transmission power of the card reader device. After the second switch is switched to the closed state, the operable elements in the resonant circuit of the signal adjustment unit include the first fixed capacitor element, the second fixed capacitor element and the coil antenna. Compared with when the second switch is in the open state, the capacitance value of the resonant circuit becomes larger, the resonant frequency of the resonant circuit becomes lower than the working resonant frequency of the card reader device, and under the influence of the signal adjustment unit, the quality factor of the card reader device becomes lower than the preset quality factor, deviating from the standard quality factor of the card reader device, that is, when the second switch element is in the closed state, the signal adjustment unit can be used to make the quality factor of the card reader device deviate from the preset quality factor, which will affect the transmission power of the card reader device.

[0112] As another implementation, if the signal conditioning unit is a unit for reducing the power of the card reader device, the resonant circuit in which the second switch element is in an open state or in a closed state can be used to reduce the power of the card reader device. Alternatively, if the signal conditioning unit is a unit for increasing the power of the card reader device, the resonant circuit in which the second switch element is in an open state or in a closed state can be used to increase the power of the card reader device. The specific principle is similar to the above embodiment and will not be repeated here.

[0113] The state control component in this embodiment can be used to control the switching state of the second switching element. It can be a digital signal conversion circuit, or it can be an MCU microcontroller unit. The specific working principle or processing logic can be the same or similar to the state control component in the aforementioned embodiments, and will not be repeated here.

[0114] If the signal conditioning unit further includes the first switch element, the first switch element may be connected in series between the second fixed capacitor and the coil antenna. For example, one end of the first switch element may be connected to one end A of the coil antenna 102, and the other end may be connected to the connection point between the second fixed capacitor and the first fixed capacitor.

[0115] In practical applications, the resistance value contained in the resonant circuit can also be controlled by a switch, so that the signal conditioning unit has multiple effects on the card reader device. Optionally, the signal conditioning unit also includes a state control component. The load circuit also includes a third switch element; the fourth control end of the third switch element is connected to the state control component; the third switch element is connected in series with the first resistive element.

[0116] Fig. 9 Schematic diagram of the structure of a signal conditioning unit provided in an embodiment of this specification. Fig. 9 As shown, the load circuit 104 may include a third switch element K3, a first resistive element R1, and a third capacitive element C3. One end d1 of the third capacitive element C3 may be connected to one end A of the coil antenna 102, and the other end d2 may be connected to the other end B of the coil antenna 102. One end e1 of the first resistive element R1 may intersect with one end d1 of the third capacitive element C3 and one end A of the coil antenna 102 at one point, the other end e2 of the first resistive element R1 may be connected to one end h1 of the third switch element K3, and the other end h2 of the third switch element K3 may intersect with the other end d2 of the third capacitive element C3 and the other end B of the coil antenna 102 at one point. The fourth control end of the third switch element K3 is connected to the state control component 106.

[0117] As an embodiment, the third switch element is in an open state, and the resonant circuit of the signal adjustment unit can be used to make the quality factor of the card reader device conform to the preset quality factor; the second switch element is in a closed state, and the resonant circuit is used to make the quality factor of the card reader device deviate from the preset quality factor.

[0118] For example, the third switch element is in an open state, and the operable elements in the resonant circuit of the signal conditioning circuit include a coil antenna and a third capacitor element. Assuming that in this state, the resonant frequency of the resonant circuit is equal to the operating resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal conditioning unit is equal to the preset quality factor, that is, the third switch element is in an open state, and the signal conditioning unit can be used to make the quality factor of the card reader device conform to the preset quality factor, thereby increasing the transmission power of the card reader device. After the third switch is switched to a closed state, the operable elements in the resonant circuit of the signal conditioning unit include a coil antenna, a third capacitor element, and a first resistive element. Compared with when the third switch is in an open state, the resistance value of the resonant circuit becomes larger, and the first resistive element can consume energy in the circuit. Under the influence of the signal conditioning unit, the quality factor of the card reader device becomes less than the preset quality factor, deviating from the standard quality factor of the card reader device, that is, the third switch element is in a closed state, and the signal conditioning unit can be used to make the quality factor of the card reader device deviate from the preset quality factor, which will affect the transmission power of the card reader device.

[0119] As another embodiment, the third switch element is in a closed state, and the resonant circuit of the signal adjustment unit can be used to make the quality factor of the card reader device conform to the preset quality factor; the second switch element is in an open state, and the resonant circuit is used to make the quality factor of the card reader device deviate from the preset quality factor.

[0120] For example, the third switch element is in a closed state, and the operable elements in the resonant circuit of the signal conditioning circuit include a coil antenna, a third capacitor element, and a first resistive element. Assuming that in this state, the resonant frequency of the resonant circuit is equal to the operating resonant frequency of the card reader device, and the quality factor of the card reader device under the influence of the signal conditioning unit is equal to the preset quality factor, that is, the third switch element is in a closed state, and the signal conditioning unit can be used to make the quality factor of the card reader device conform to the preset quality factor, thereby increasing the transmission power of the card reader device. After the third switch is switched to an open state, the operable elements in the resonant circuit of the signal conditioning unit include a coil antenna and a third capacitor element, and the resistance value of the resonant circuit becomes smaller than when the third switch is in an open state. Under the influence of the signal conditioning unit, the quality factor of the card reader device becomes greater than the preset quality factor, exceeding the standard quality factor of the card reader device, that is, the third switch element is in an open state, and the signal conditioning unit can be used to make the quality factor of the card reader device deviate from the preset quality factor, which will affect the transmission power of the card reader device.

[0121] As another implementation, if the signal conditioning unit is a unit for reducing the power of the card reader device, the resonant circuit in which the third switch element is in an open state or in a closed state can be used to reduce the power of the card reader device. Alternatively, if the signal conditioning unit is a unit for increasing the power of the card reader device, the resonant circuit in which the third switch element is in an open state or in a closed state can be used to increase the power of the card reader device. The specific principle is similar to the above embodiment and will not be repeated here.

[0122] The state control component in this embodiment can be used to control the switching state of the third switching element. It can be a digital signal conversion circuit, or it can be an MCU microcontroller unit. The specific working principle or processing logic can be the same or similar to the state control component in the aforementioned embodiments, and will not be repeated here.

[0123] If the signal conditioning unit further includes the first switch element, the first switch element can be connected in series between the third capacitor element and the coil antenna. For example, one end of the first switch element can be connected to one end A of the coil antenna 102, and the other end can be connected to the intersection of the third capacitor element and the first resistor element.

[0124] As an implementation mode, the first resistive element R1 may be an adjustable resistive element, and the control end of the adjustable resistive element may be connected to a state control component, and the state control component is used to adjust the resistance value of the adjustable resistive element in the circuit. This implementation mode may also realize a signal adjustment unit in multiple states. It is also possible not to adjust the resistance value of the resonant circuit of the signal adjustment unit by using a third switching element. The specific logic and principle are the same or similar to those of the above-mentioned embodiments, and will not be repeated here.

[0125] It should be noted that the state control components used in the above embodiments may be the same or identical state control components, or different state control components, as long as they can be used to adjust adjustable inductors, adjustable capacitors or switching elements, etc., without specific limitation here.

[0126] It should be understood that the connection order of some components of the signal conditioning unit described in one or more embodiments of this specification can be adjusted according to actual needs, or some components can be omitted or deleted.

[0127] Based on the same idea, the embodiments of this specification also provide a card reader device including the above signal adjustment unit. The card reader device may include the signal adjustment unit described in at least one of the above embodiments.

[0128] Optionally, the card reader device may include a state adjustment control, which may be connected to the first switch element and / or the state control component in the signal adjustment unit to control the working state of the signal adjustment unit.

[0129] The state adjustment control may be a manually operable control or an automatically operable control, which is not specifically limited here.

[0130] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0131] It can be understood that the above-mentioned embodiments describe the solutions from multiple perspectives. In practical applications, the contents described in one or more embodiments can be adopted according to actual needs, or multiple embodiments can be superimposed or adjusted and implemented according to actual needs, which will not be described one by one here.

[0132] The components in the embodiments of this specification are only functionally described, and specific parameters or quantities can be set according to actual needs. For example, the adjustable inductor element can be an inductive component capable of adjusting the inductance value, for example, it can be a single adjustable inductor, or it can also be a combined inductor including multiple single adjustable inductors, or it can be other inductive components. The adjustable capacitor element can be a capacitive component capable of adjusting the capacitance value, for example, it can be a single capacitor, or it can also be a combined capacitor including one or more single capacitors, or it can be other capacitive components. For another example, the first capacitor element, the second capacitor element, the third capacitor, the fourth capacitor, etc. can be capacitive elements, for example, they can be capacitors with fixed capacitance values, or they can also be capacitors with adjustable capacitance values, specifically, they can be single capacitors, or they can also be combined capacitors including multiple single capacitors, or they can also be other capacitive components. For another example, the switch element can be a mechanical switch or an electronic switch, as long as the switch function can be realized. The specific form, type and quantity of each electronic component are not limited here, as long as the corresponding function is realized.

[0133] In the 1990s, it was very clear whether the improvement of a technology was hardware improvement (for example, improvement of the circuit structure of diodes, transistors, switches, etc.) or software improvement (improvement of the method flow). However, with the development of technology, many improvements of the method flow today can be regarded as direct improvements of the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved method flow into the hardware circuit. Therefore, it cannot be said that the improvement of a method flow cannot be implemented with hardware entity modules. For example, a programmable logic device (PLD) (such as a field programmable gate array (FPGA)) is such an integrated circuit whose logical function is determined by the user's programming of the device. Designers can "integrate" a digital system on a PLD by programming it themselves, without having to ask chip manufacturers to design and make dedicated integrated circuit chips. Moreover, nowadays, instead of manually making integrated circuit chips, this kind of programming is mostly implemented by "logic compiler" software, which is similar to the software compiler used when developing and writing programs, and the original code before compilation must also be written in a specific programming language, which is called hardware description language (HDL). There is not only one kind of HDL, but many kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, RHDL (Ruby Hardware Description Language), etc. The most commonly used ones are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also know that it is only necessary to program the method flow slightly in the above-mentioned hardware description languages ​​and program it into the integrated circuit, and then it is easy to obtain the hardware circuit that implements the logic method flow.

[0134] The controller may be implemented in any suitable manner, for example, the controller may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (e.g., software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include but are not limited to the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, and the memory controller may also be implemented as part of the control logic of the memory. It is also known to those skilled in the art that, in addition to implementing the controller in a purely computer-readable program code manner, the controller may be implemented in the form of a logic gate, a switch, an application-specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, such a controller may be considered as a hardware component, and the devices for implementing various functions included therein may also be considered as structures within the hardware component. Or even, the devices for implementing various functions may be considered as both software modules for implementing the method and structures within the hardware component.

[0135] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0136] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0137] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0138] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0139] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0140] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0141] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0142] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0143] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined in this article, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0144] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or 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 process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0145] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0146] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0147] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A signal conditioning unit, applied to a card reader device, comprising: a coil antenna and a load circuit including a capacitive element; One end of the coil antenna is connected to one end of the load circuit, and the other end of the coil antenna is connected to the other end of the load circuit; The coil antenna and the load circuit are used to form a resonant circuit; The resonant circuit is used to influence the quality factor of the card reader device so that the quality factor of the card reader device meets or deviates from a preset quality factor; the preset quality factor is a preset working quality factor of the card reader device.

2. The signal conditioning unit according to claim 1, wherein if the resonant circuit is used to make the quality factor of the card reader device conform to a preset quality factor, the resonant frequency of the resonant circuit is equal to the operating resonant frequency of the card reader device.

3. The signal conditioning unit according to claim 1, further comprising a first switching element; The first switch element is located between the coil antenna and the load circuit, and is used to control whether the signal adjustment unit is in an operable state. The signal conditioning unit of claim 3 , wherein the first switching element comprises a light-sensitive switching element.

5. The signal conditioning unit according to claim 1, wherein the capacitive element comprises a first capacitive element, and the load circuit further comprises a first inductive element; the first inductive element is connected in series with the coil antenna; and the first capacitive element is connected in parallel with the coil antenna.

6. The signal conditioning unit of claim 1, the capacitive element comprising a second capacitive element; the second capacitive element being connected in parallel with the coil antenna.

7. The signal conditioning unit according to claim 1, the load circuit comprising a third capacitive element and a first resistive element; the third capacitive element is connected in parallel with the coil antenna; the first resistive element is connected in parallel with the third capacitive element.

8. The signal conditioning unit according to claim 5, further comprising a state control component; The first inductor element includes an adjustable inductor element; the state control component is connected to a first control terminal of the adjustable inductor element, so that the adjustable inductor element can be in a first state of a first inductance value or the adjustable inductor can be in a second state of a second inductance value; in, In the first state, the resonant circuit is used to make the quality factor of the card reader device conform to a preset quality factor; or, in the second state, the resonant circuit is used to make the quality factor of the card reader device deviate from the preset quality factor.

9. The signal conditioning unit according to claim 6, further comprising a state control component; The second capacitor includes an adjustable capacitor; the state control component is connected to the second control end of the adjustable capacitor, so that the adjustable capacitor can be in a third state of the first capacitance value or the adjustable capacitor can be in a fourth state of the second capacitance value; in, In the third state, the resonant circuit is used to make the quality factor of the card reader device conform to a preset quality factor; or, in the fourth state, the resonant circuit is used to make the quality factor of the card reader device deviate from a preset quality factor.

10. The signal conditioning unit according to claim 6, further comprising a state control component; The load circuit also includes a second switch element; the third control end of the second switch element is connected to the state control component; the second capacitor element includes a first fixed capacitor element and a second fixed capacitor element; the second switch element is connected in series with the first fixed capacitor element and then connected in parallel with the second fixed capacitor element; the second fixed capacitor element is connected in parallel with the coil antenna.

11. The signal conditioning unit according to claim 7, further comprising a state control component; The load circuit further comprises a third switch element; a fourth control terminal of the third switch element is connected to the state control component; and the third switch element is connected in series with the first resistive element.

12. The signal conditioning unit according to any one of claims 8 to 11, wherein the state control component comprises a digital signal conversion circuit, an input end of the digital signal conversion circuit is connected to the coil antenna so as to output a digital level signal.

13. The signal conditioning unit according to any one of claims 8 to 11, wherein the state control component comprises an MCU microcontroller unit for adjusting the state of the resonant circuit; If the card reader device meets the signal enhancement condition, the micro control unit controls the resonant circuit to be in a state of enhancing the power of the card reader device; Alternatively, if the card reader device meets the signal weakening condition, the micro control unit controls the resonant circuit to be in a state of weakening the power of the card reader device; in, The signal enhancement condition includes at least one of: the card reader device is in working state, other entities exist within a preset range of the card reader device, and the card reader device fails to successfully obtain tag information; The signal attenuation condition includes at least one of the following: the card reader device is in an idle state or a standby state, and the MCU microcontroller unit obtains an adjustment instruction sent by a device serving as an NFC tag; the adjustment instruction is generated after the device serving as an NFC tag senses a radio frequency interference signal.

14. A card reader device, comprising the signal conditioning unit according to any one of claims 1 to 13.

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