CN112887950B - Detection circuit, near field communication NFC function control method and electronic equipment - Google Patents

Detection circuit, near field communication NFC function control method and electronic equipment Download PDF

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CN112887950B
CN112887950B CN202110076271.5A CN202110076271A CN112887950B CN 112887950 B CN112887950 B CN 112887950B CN 202110076271 A CN202110076271 A CN 202110076271A CN 112887950 B CN112887950 B CN 112887950B
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nfc
nfc coil
coil
driving module
switch
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CN112887950A (en
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李富贵
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

The application discloses detection circuit, NFC function control method and electronic equipment belong to the communication technology field, wherein, detection circuit includes: the NFC device comprises an NFC driving module, an NFC coil, a control unit and a detection module; the output end of the control unit is connected with the control end of the NFC driving module, the first end of the NFC driving module is connected with the first end of the NFC coil, the first end of the detection module is connected with the first end of the NFC coil, and the second end of the detection module is connected with the input end of the control unit; the detection module provides a first electric signal to the first end of the NFC coil, and when the connection of the NFC coil is in an abnormal state based on the electric signal value of the NFC coil, the second end of the detection module transmits a second electric signal to the input end of the control unit, so that the control unit controls the NFC driving module to be in a closed state based on the second electric signal. According to the NFC module and the NFC module reliability improvement method, the NFC module reliability can be improved.

Description

Detection circuit, near field communication NFC function control method and electronic equipment
Technical Field
The application belongs to the technical field of near field communication, and particularly relates to a detection circuit, a near field communication NFC function control method and electronic equipment.
Background
Near field communication (Near Field Communicatio, NFC) is a short-range, high frequency wireless communication technology that allows contactless point-to-point data transfer between electronic devices, exchanging data. The method has the advantages of high communication speed, convenient operation and the like, so that the method has wide application prospect, such as: the method is applied to various data interaction scenes such as electronic payment, identity authentication, ticketing, data exchange, anti-counterfeiting, advertisement and the like.
The NFC module includes: the NFC driving circuit and the NFC coil drive the NFC coil to send and receive high-frequency magnetic field signals when NFC communication is started, namely the NFC coil completes interaction of the NFC signals.
In the related art, the connection between the NFC coil and the circuits (e.g., NFC coil and NFC driving circuit) in the electronic device may be unreliable due to aging, vibration, etc., which may cause abnormal output power of the NFC driving circuit and even damage to the integrated circuit chip (Integrated Circuit Chip, IC) in the terminal.
Disclosure of Invention
An object of the embodiment of the application is to provide a detection circuit, a near field communication NFC function control method and an electronic device, which can solve the problem that when an NFC function is started in the related art, an output power supply of an NFC driving circuit is abnormal due to unreliable circuit connection between an NFC coil and a terminal.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, embodiments of the present application provide a detection circuit, including: the NFC device comprises a near field communication NFC driving module, an NFC coil, a control unit and a detection module;
the output end of the control unit is connected with the control end of the NFC driving module, the first end of the NFC driving module is connected with the first end of the NFC coil, the first end of the detection module is connected with the first end of the NFC coil, and the second end of the detection module is connected with the input end of the control unit;
the detection module provides a first electric signal to the first end of the NFC coil, and the second end of the detection module transmits a second electric signal to the input end of the control unit under the condition that the electric signal value on the NFC coil meets a preset condition, and the control unit controls the NFC driving module to be in a closed state based on the second electric signal;
and the electric signal value on the NFC coil meets a preset condition, which indicates that the connection of the NFC coil is in an abnormal state.
In a second aspect, embodiments of the present application provide an electronic device comprising a detection circuit as described in the first aspect.
In a third aspect, an embodiment of the present application provides an NFC function control method, which is applied to the detection circuit in the first aspect, where the NFC function control method includes:
determining a connection state of the NFC coil based on the electrical signal value detected by the second end of the detection module;
and under the condition that the connection state of the NFC coil is abnormal, controlling the NFC driving module to be in a closed state.
In a fourth aspect, embodiments of the present application provide an electronic device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method according to the third aspect.
In a fifth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the third aspect.
In a sixth aspect, embodiments of the present application provide a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and where the processor is configured to execute a program or instructions to implement a method according to the third aspect.
In an embodiment of the present application, a detection circuit includes: the NFC device comprises a near field communication NFC driving module, an NFC coil, a control unit and a detection module; the output end of the control unit is connected with the control end of the NFC driving module, the first end of the NFC driving module is connected with the first end of the NFC coil, the first end of the detection module is connected with the first end of the NFC coil, and the second end of the detection module is connected with the input end of the control unit; the detection module provides a first electric signal to the first end of the NFC coil, and the second end of the detection module transmits a second electric signal to the input end of the control unit under the condition that the electric signal value on the NFC coil meets a preset condition, and the control unit controls the NFC driving module to be in a closed state based on the second electric signal; and the electric signal value on the NFC coil meets a preset condition, which indicates that the connection of the NFC coil is in an abnormal state. Like this, can detect the connected state between NFC coil and the NFC driving module through detection module to in time discover the abnormal condition of being connected between NFC coil and the NFC driving module, at this moment, still be in the closed state through control unit control NFC driving module, in order to avoid starting the NFC function under the unusual circumstances of being connected between NFC coil and NFC driving module, can prevent that NFC driving module output abnormal power and lead to the fact the damage to electronic equipment and NFC driving module itself, thereby can promote electronic equipment's reliability.
Drawings
Fig. 1 is a block diagram of a detection circuit according to an embodiment of the present application;
FIG. 2a is one of the circuit diagrams of a detection circuit according to an embodiment of the present application;
FIG. 2b is a second circuit diagram of a detection circuit according to the embodiment of the present application;
FIG. 3 is a flow chart of the operation of a detection circuit provided in an embodiment of the present application;
FIG. 4 is a block diagram of another detection circuit provided in an embodiment of the present application;
FIG. 5a is one of the circuit diagrams of another detection circuit provided in an embodiment of the present application;
FIG. 5b is a second circuit diagram of another detection circuit according to the embodiment of the present application;
fig. 6 is a flowchart of an NFC function control method provided in an embodiment of the present application;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
NFC is a mature near field communication technology, which is also called near field communication, is a short-distance high-frequency wireless communication technology, and allows non-contact point-to-point data transmission and data exchange between electronic devices.
The working principle of the NFC is as follows: the NFC coil and the card reader coil are similar to a transformer in functional structure, the card reader coil corresponds to a primary coil of the transformer, the NFC coil corresponds to a secondary coil of the transformer, a high-frequency magnetic field is generated around the coil through coupling of high-frequency alternating current (for example, 13.56MHz alternating current) of the primary coil, and if the NFC coil approaches the magnetic field, alternating magnetic force lines pass through the NFC coil, so that enough current is generated in the NFC coil to read chip information of the card reader according to the change of the current.
As can be seen from the above, the communication of NFC is highly dependent on the NFC coil, so whether the NFC coil is in place (i.e. connected to the internal circuit of the terminal) or not may affect the NFC function of the terminal, and may even cause a problem of reduced reliability of the terminal:
on the one hand, when the NFC coil is in place, the NFC coil is equivalent to a load (i.e. equivalent inductance model) output by the NFC driving module, so that when the load is out of place, the impedance of the matching circuit in the NFC radio frequency path will be affected, and in severe cases, the impedance in the equivalent NFC radio frequency path may be reduced to be close to zero ohm; at this time, if the NFC driving module is still in an operating state, an abnormal output power of the NFC driving module (i.e., out of the loading capability) may be caused, and in serious cases, damage may be caused to an IC in the NFC driving module or an IC in the terminal.
On the other hand, poor contact between the NFC coil and the motherboard in the terminal will affect the use of NFC functions and other radio frequency functions by the user, and cause interference to problem positioning in maintenance work, making it difficult to determine a fault point in the terminal device.
In this embodiment of the present application, an electrical signal can be actively provided to the NFC coil 12, and the change of the electrical signal value on the NFC coil 12 is detected, so as to determine whether the connection state of the NFC coil 12 is abnormal, and when the connection state of the NFC coil 12 is abnormal, timely control the NFC driving module 11 to be in a closed state, so as to avoid the problem that the NFC driving module 11 continues to work and output an abnormal power supply, and the reliability is poor caused by the abnormal power supply, and when the NFC driving module 11 is in the closed state, a maintainer can easily determine that the fault point in the terminal device is in the NFC functional module, thereby reducing the complexity in the maintenance process.
The detection circuit, the NFC function control method, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings by specific embodiments and application scenarios thereof.
Referring to fig. 1, a structure diagram of a detection circuit according to an embodiment of the present application is shown in fig. 1, where the detection circuit includes: the NFC driving module 11, the NFC coil 12, the control unit 13 and the detection module 14.
The output end of the control unit 13 is connected with the control end of the NFC driving module 11, the first end of the NFC driving module 11 is connected with the first end of the NFC coil 12, the first end of the detection module 14 is connected with the first end of the NFC coil 12, and the second end of the detection module 14 is connected with the input end of the control unit 13.
The detection module 14 provides a first electrical signal to the first end of the NFC coil 12, and in case that the electrical signal value on the NFC coil 12 meets a preset condition, the second end of the detection module 14 transmits a second electrical signal to the input end of the control unit 13, and the control unit 13 controls the NFC driving module 11 to be in a closed state based on the second electrical signal. The value of the electric signal on the NFC coil 12 satisfies a preset condition, which indicates that the connection of the NFC coil 12 is in an abnormal state.
The connection of the NFC coil 12 is in an abnormal state, which may be referred to as: the NFC coil 12 is out of position, which can be understood as: there is an abnormality in the connection state between the NFC coil 12 and the internal circuit of the electronic device, which may specifically include that the connection between the first end of the NFC coil 12 and the first end of the NFC drive module 11 is in an abnormal state.
In implementation, the NFC driving module 11 adjusts the working state of the NFC driving module 11 according to the control signal received by the control terminal thereof, for example: under the condition that the control end of the NFC driving module 11 receives the first control signal, the NFC driving module 11 works in a normal working state; in the case that the control terminal of the NFC driving module 11 receives the second control signal, the NFC driving module 11 operates in a disabled state (i.e., an off state), and the first control signal and the second control signal may be digital control signals or analog control signals, which are not limited herein.
In addition, the first end of the NFC coil 12 may be a first end or a terminal of the NFC coil 12, and the first end of the NFC driving module 11 may be a connection end of the NFC driving module 11 for sending a driving signal to the NFC coil 12, or may be a connection end for receiving an electromagnetic induction signal received by the NFC coil 12.
In implementation, the detection module 14 provides the first electrical signal to the first end of the NFC coil 12, at this time, the value of the electrical signal on the first end of the NFC coil 12 will be affected by the connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11, that is, when the first end of the NFC coil 12 and the first end of the NFC driving module 11 are in the normal connection state, the value of the electrical signal on the first end of the NFC coil 12 is different from the value of the electrical signal on the first end of the NFC coil 12 and the first end of the NFC driving module 11 are in the abnormal connection state.
In this embodiment, based on the change of the electrical signal value on the first end of the NFC coil 12, it is determined whether the connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11 is abnormal, so that when the electrical signal value on the first end of the NFC coil 12 meets the preset condition to determine that the first end of the NFC coil 12 and the first end of the NFC driving module 11 are in the abnormal connection state, the control unit 13 controls the NFC driving module 11 to be in the closed state.
In this way, even if the electronic device controls the NFC function to start, the NFC driving module 11 will still be in the off state, so as to avoid the abnormal output power of the NFC driving module 11 caused by starting the NFC function when the NFC coil 12 is not in place, and avoid the damage of the IC in the NFC driving module 11 and the components in the electronic device caused by the abnormal power.
It should be noted that, when the value of the electrical signal on the NFC coil 12 does not meet the preset condition, it indicates that the connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11 is not abnormal, at this time, the second end of the detecting module 14 may transmit a third electrical signal to the input end of the control unit 13, and the control unit 13 controls the NFC driving module 11 to be in a normal working state based on the third electrical signal. The NFC driving module 11 is in a normal operating state, which means that: when the electronic device starts the NFC function, the NFC driving module 11 drives the NFC coil 12 to send and receive signals.
The control unit 13 may be a central processing unit (Central Processing Unit, CPU) in the electronic device, or the control unit 13 may be a control unit newly added to a detection circuit, for example: the micro control unit (Microcontroller Unit, MCU) is not particularly limited herein to the control unit 13.
In an embodiment of the present application, a detection circuit includes: the NFC device comprises a near field communication NFC driving module, an NFC coil, a control unit and a detection module; the output end of the control unit is connected with the control end of the NFC driving module, the first end of the NFC driving module is connected with the first end of the NFC coil, the first end of the detection module is connected with the first end of the NFC coil, and the second end of the detection module is connected with the input end of the control unit; the detection module provides a first electric signal to the first end of the NFC coil, and the second end of the detection module transmits a second electric signal to the input end of the control unit under the condition that the electric signal value on the NFC coil meets a preset condition, and the control unit controls the NFC driving module to be in a closed state based on the second electric signal; the value of the electric signal on the NFC coil meets a preset condition, which indicates that the connection between the first end of the NFC coil and the first end of the NFC driving module is in an abnormal state. Like this, can detect the connected state between NFC coil and the NFC driving module through detection module to in time discover the abnormal condition of being connected between NFC coil and the NFC driving module, at this moment, still be in the closed state through control unit control NFC driving module, in order to avoid starting the NFC function under the unusual circumstances of being connected between NFC coil and NFC driving module, can prevent that NFC driving module output abnormal power and lead to the fact the damage to electronic equipment and NFC driving module itself, thereby can promote electronic equipment's reliability.
As an alternative embodiment, as shown in fig. 2a or fig. 2b, the detection module 14 includes: a power VCC and a switching unit 141;
when the first end of the NFC coil 12 is in an abnormal connection state with the first end of the NFC driving module 11 and/or the second end of the NFC coil 12 is in an abnormal connection state with the second end of the NFC driving module 11, the switching unit 141 is in a first working state, so that the second end of the detection module 14 (i.e. the sys end as shown in fig. 2 a) obtains the second electrical signal from the power VCC;
when the first end of the NFC coil 12 is in a normal connection state with the first end of the NFC driving module 11 and/or the second end of the NFC coil 12 is in a normal connection state with the second end of the NFC driving module 11, the switching unit 141 is in a second working state, so that the sys end of the detection module 14 obtains a third electrical signal from the power VCC, and the control unit 13 controls the NFC driving module 11 to be in a working state based on the third electrical signal.
In implementation, the switching unit 141 may include a switching structure, and the switching structure may be capable of switching the working state according to a connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11 and/or a connection state between the second end of the NFC coil 12 and the second end of the NFC driving module 11.
In addition, the power source VCC in the embodiment shown in fig. 2a is a voltage source, but in a specific implementation, the power source VCC may be a current source, and the current source or the voltage source may be an electronic component or a connection port electrically connected to a battery in the electronic device to have a constant current value or a constant voltage value, or the power source may be an independent current source or a separate voltage source, which is not limited herein.
Specifically, in an alternative embodiment, as shown in fig. 1, the second terminal of the NFC driving module 11 is connected to the second terminal of the NFC coil 12, and the third terminal of the detection module 14 is connected to the second terminal of the NFC coil 12.
In this embodiment, it can be understood that the first and the end of the NFC coil 12 are connected to the NFC driving module 11, respectively. At this time, the switch structure may be capable of switching the working state according to the connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11, and the connection state between the second end of the NFC coil 12 and the second end of the NFC driving module 11.
In another alternative embodiment, as shown in fig. 4, the second end of the NFC coil 12 is grounded.
This embodiment can be understood as: one end of the NFC coil 12 is connected to the NFC driving module 11, and the other end of the NFC coil 12 is grounded, for example: the NFC coil 12 is formed by a metal middle frame of the electronic device, and at this time, if the first end of the NFC coil 12 is used to be connected to the first end of the NFC driving module 11, the switching unit 141 can switch the working state according to the connection state between the first end of the NFC coil 12 and the first end of the NFC driving module 11.
In addition, when the switching unit 141 is in the first working state or the second working state, the connection state or the connection line between the sys terminal of the detection module 14 and the power VCC is changed, so that the electrical signal value obtained at the sys terminal of the detection module 14 is also changed correspondingly, that is: in the first working state of the switching unit 141, the sys terminal of the detection module 14 obtains the second electrical signal from the power VCC; in the second operating state of the switching unit 141, the sys terminal of the detection module 14 obtains the third electrical signal from the power VCC, where the second electrical signal and the third electrical signal are electrical signal values with different values, for example: voltage or current values of different values.
In this embodiment, the power VCC and the switching unit 141 are disposed in the detecting module 14, so that the working state of the switching unit 141 is switched according to whether the connection state between the NFC coil 12 and the NFC driving module 11 is abnormal, and when the switching unit 141 is in different working states, the sys end of the detecting module 14 obtains different electrical signal values from the power source, so that the detecting module 14 sends different electrical signals to the control unit 13 according to whether the connection state between the NFC coil 12 and the NFC driving module 11 is abnormal, so that the control unit 13 determines whether the connection state between the NFC coil 12 and the NFC driving module 11 is abnormal according to the electrical signal values sent by the detecting module 14, and when it is determined that the connection state between the NFC coil 12 and the NFC driving module 11 is abnormal, controls the NFC driving module 11 to be turned off, and when it is determined that the connection state between the NFC coil 12 and the NFC driving module 11 is not abnormal, controls the NFC driving module 11 to be in the working state.
As an alternative embodiment, as shown in fig. 2a, the switching unit 141 includes: the first switch P1, the first resistor R1, the second resistor R2 and the third resistor R3;
the power supply VCC is connected with the first end of the NFC coil 12 through a first resistor R1, the second end of the NFC coil 12 is connected with the control end of a first switch P1, the first end of the first switch P1 is connected with the power supply VCC through a second resistor R2, the second end of the first switch P1 is grounded, the sys end of the detection module 14 is connected with the first end of the first switch P1, and the sys end of the detection module 14 is grounded through a third resistor R3;
When the first end of the NFC coil 12 and the first end of the NFC driving module 11 are in an abnormal connection state and/or the second end of the NFC coil 12 and the second end of the NFC driving module 11 are in an abnormal connection state, the first switch P1 is in the first working state, so that the second end of the detection module 13 transmits the second electrical signal to the input end of the control unit 13;
when the first end of the NFC coil 12 is in a normal connection state with the first end of the NFC driving module 11 and the second end of the NFC coil 12 is in a normal connection state with the second end of the NFC driving module 11, the first switch P1 is in the second working state, so that the second end of the detection module 14 transmits the third electrical signal to the input end of the control unit 13.
In a specific implementation, as shown in fig. 2a, the first switch P1 may be a PMOS transistor, where a gate of the PMOS transistor is a control end of the first switch P1, and a drain and a source of the PMOS transistor are a first end and a second end of the first switch P1, respectively.
In this embodiment, when the coil 12 is in a normal connection state with a circuit in the electronic device (i.e., the first end of the NFC coil 12 is in a normal connection state with the first end of the NFC driving module 11, and the second end of the NFC coil 12 is in a normal connection state with the second end of the NFC driving module 11), the first end of the detection module 14 (i.e., the TP1 end as shown in fig. 2 a) is connected with the first end of the NFC coil 12, and the third end of the detection module 14 (i.e., the TP2 end as shown in fig. 2 a) is connected with the second end of the NFC coil 12, at this time, since the coil 12 is in a coil structure, the first end and the second end thereof are in communication, so that when the coil 12 is in a normal connection state with a circuit in the electronic device, the TP1 end and the TP2 end are mutually conducted.
At this time, the power VCC will be sequentially transmitted to the control end of the first switch P1 through the first resistor R1 and the NFC coil 12, so as to drive the first switch P1 to be turned off due to the high level received by the gate thereof, and further disconnect the sys end of the detection module 14 from the ground end, at this time, since the sys end of the detection module 14 is grounded through the third resistor R3 and pulled up to the power VCC through the second resistor R2, the sys end has the high level, i.e. the sys end of the detection module 14 will transmit the high level to the control unit 13. In other words, in the present embodiment, the third electric signal is a high-level signal.
Correspondingly, when the coil 12 is in an abnormal connection state with a circuit in the electronic device (i.e., the first end of the NFC coil 12 is in an abnormal connection state with the first end of the NFC driving module 11 and/or the second end of the NFC coil 12 is in an abnormal connection state with the second end of the NFC driving module 11), the TP1 end and the TP2 end are disconnected.
At this time, the power VCC is disconnected from the control terminal of the first switch P1, so that the first switch P1 is turned on due to the low level received by the gate thereof, and the sys terminal of the detection module 14 is turned on with the ground terminal, so that the sys terminal has a low level, i.e. the sys terminal of the detection module 14 will transmit a low level to the control unit 13. In other words, in the present embodiment, the second electric signal is a low-level signal.
In this embodiment, in the first operating state, the first switch P1 is turned on; in the second operating state, the first switch P1 is turned off; and the second electrical signal is less than the third electrical signal;
the low level and the high level are level values with respect to each other, that is, the level value of the high level signal is higher than the level value of the low level signal, and specific values of the low level signal and the high level signal are not limited thereto.
The present embodiment is suitable for an application scenario that the head section and the tail end of the NFC coil 12 are respectively connected with the NFC driving module 11, and the detection module 14 is respectively connected with the head section and the tail end of the NFC coil 12, so that when the NFC coil 12 is in place, the control terminal voltage of the first switch P1 is adjusted by using the conducting characteristics of the head section and the tail end of the NFC coil 12, so that the first switch P1 is turned on or off along with the in-place situation of the NFC coil 12, so that when the NFC coil 12 is in place and out of place, different value level signals are respectively transmitted to the control unit 13, and the control unit determines the in-place situation of the NFC coil 12 according to the value of the received level signals.
It should be noted that, the first switch may be a PMOS transistor, and may also be an NMOS transistor.
For example: as shown in fig. 2b, the first switch N1 in this embodiment is an NMOS transistor. In this way, when the coil 12 and the circuit in the electronic device are in a normal connection state, the power VCC is sequentially transmitted to the control end of the first switch N1 through the first resistor R1 and the NFC coil 12, so as to drive the first switch N1 to be turned on, and further connect the sys end of the detection module 14 with the ground, at this time, the sys end has a low level, that is, the sys end of the detection module 14 will transmit the low level to the control unit 13. In other words, in the present embodiment, the third electric signal is a low-level signal.
Accordingly, in the embodiment shown in fig. 2b, when the coil 12 is in an abnormal connection state with the circuit in the electronic device, the TP1 end is disconnected from the TP2 end, and at this time, the power VCC is disconnected from the control end of the first switch N1, so that the first switch N1 is disconnected, and at this time, since the sys end of the detection module 14 is grounded through the third resistor R3 and pulled up to the power VCC through the second resistor R2, the sys end of the detection module 14 has a high level, that is, the sys end of the detection module 14 will transmit a high level to the control unit 13. In other words, in the present embodiment, the second electric signal is a high-level signal.
In this embodiment, in the first operating state, the first switch N1 is turned off; in the second working state, the first switch N1 is conducted; and the second electrical signal is greater than the third electrical signal.
The embodiment is also applicable to an application scenario that the head section and the tail end of the NFC coil 12 are respectively connected with the NFC driving module 11, and the detecting module 14 is respectively connected with the head section and the tail end of the NFC coil 12, so as to realize that when the NFC coil 12 is in place and out of place, level signals with different values are respectively transmitted to the control unit 13, so that the control unit determines the in-place condition of the NFC coil 12 according to the values of the received level signals.
Further, in the embodiment shown in fig. 2a and 2b, a seventh resistor R7 may be further disposed between the control terminal of the first switch (P1, N1) and the ground terminal, and an eighth resistor R8 may be disposed between TP2 and the control terminal of the first switch (P1, N1).
The eighth resistor R8 is used for providing gate protection for the first switches (P1, N1) so as to prevent the gate of the first switches (P1, N1) from flowing over-current. In addition, the seventh resistor R7 is used to pull down the gates of the first switches (P1, N1) to the ground when the NFC coil 12 is out of position, so as to reduce the gate voltages of the first switches (P1, N1). Of course, in practical applications, when the NFC coil 12 is not in place, the gate electrodes of the first switches (P1, N1) are not conductive to the power VCC, so that the gate voltages of the first switches (P1, N1) are also reduced relative to the gate voltages of the NFC coil 12 when in place, and in this embodiment, the seventh resistor R7 is disposed between the control terminal and the ground terminal of the first switches (P1, N1), so that the speed of reducing the gate voltages of the first switches (P1, N1) can be accelerated, thereby reducing the response time of the detection circuit.
It should be noted that, in implementation, when the NFC coil 12 is in place, the NFC function is started, that is, the voltage of the NFC coil 12 will generate a ripple, in order to stabilize the operation state of the first switch (P1, N1), the bias voltage provided by the power source VCC at the gate of the first switch (P1, N1) needs to be selected to satisfy the normal operation condition of the first switch (P1, N1), for example: vgs is greater than or equal to the required turn-on voltage of the first switch P1 (PMOS transistor).
Accordingly, the resistance values of R2 and R3 also need to satisfy the requirements of the control unit 13 for the second electric signal and the third electric signal. For example: when the NFC coil 12 is in the bit, the first switch P1 is turned off, and at this time, the control unit 13 receives a level value equal to (vcc×r3)) + (r2+r3), which needs to be greater than the level value of the ground terminal (the level value of the ground terminal tends to be equal to 0).
In an implementation, when the control unit 13 determines that the NFC coil 12 is not in place based on the electrical signal transmitted by the detection module 14, a prompt message may also be output to prompt the user that the in-place state of the NFC coil 12 is abnormal, and that there may be a failure of releasing the NFC coil 12, so that the after-sales department needs to perform maintenance treatment.
For example: as shown in fig. 3, the detection circuit may perform the following process:
Step 301, detecting the presence of the NFC coil by the detection module 14.
Step 302, the detection module 14 outputs an electrical signal having a value corresponding to the on-position condition of the NFC coil to the control unit 13.
Step 303, the control unit 13 determines the in-place status of the NFC coil based on the received electrical signal.
The judgment result in the step is as follows: with the NFC coil in place, perform step 304; the judgment result in the step is as follows: if the NFC coil is not in place, step 305 is performed.
Step 304, controlling the NFC driving module 11 to power on normally.
Step 305, controlling the NFC driving module 11 to stop working, and outputting a prompt message.
The prompt information is used for prompting the user to determine that the in-place state of the NFC coil 12 is abnormal, and the user needs to go to the after-sales department for maintenance.
The detection circuit provided by the embodiment of the application, which executes each process shown in fig. 3, can realize that the NFC function is controlled to be normally started when the NFC coil is in place, and the NFC function is forbidden to be started when the NFC coil is out of place, and prompt information is output, so that the equipment and the NFC driving module are prevented from being damaged due to the fact that the NFC driving module outputs abnormal electric signals when the NFC coil is out of place, and a user can find out faults which cause the NFC coil to be out of place in time according to the prompt information.
In practice, the NFC coil 12 may be formed by a metal middle frame 10 of an electronic device, as shown in fig. 4, in which case only one end of the NFC coil 12 is connected to the NFC drive module 11 and the other end needs to be grounded.
In this embodiment, the detection module 14 may be connected to the head end of the NFC coil 12 (i.e. the end connected to the NFC driving module 11), or may also be connected to the tail end of the NFC coil 12 (i.e. the end connected to the ground end of the NFC coil 12 in the embodiment shown in fig. 4), and in this embodiment, the NFC coil 12 is a conductive overall structure, so only the first end of the detection module 14 needs to be electrically connected to the NFC coil 12.
As an alternative embodiment, as shown in fig. 5a and 5b, the switching unit 141 includes: a second switch P2, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
the power supply VCC is connected with the first end of the NFC coil 12 through a fourth resistor R4, the first end of the NFC coil 12 is also connected with the control end of a second switch P2, the first end of the second switch P2 is connected with the power supply VCC through a fifth resistor R5, the second end of the second switch P2 is grounded, the second end of the detection module 14 is connected with the first end of the second switch P2, and the second end of the detection module 14 is grounded through a sixth resistor R6;
When the first end of the NFC coil 12 and the first end of the NFC driving module 11 are in an abnormal connection state and/or the second end of the NFC coil 12 and the ground end 11 are in an abnormal connection state, the second switch P2 is in the first working state, so that the second end of the detection module 14 transmits the second electrical signal to the input end of the control unit 13;
when the first end of the NFC coil 12 is in a normal connection state with the first end of the NFC driving module 11 and the second end of the NFC coil 12 is in a normal connection state with the ground, the second switch P2 is in the second working state, so that the second end of the detection module 14 transmits the third electrical signal to the input end of the control unit 13.
In a specific implementation, as shown in fig. 5a, the second switch P2 may be a PMOS transistor, where a gate of the PMOS transistor is a control end of the second switch P2, and a drain and a source of the PMOS transistor are a first end and a second end of the second switch P2, respectively.
In this embodiment, when the coil 12 is in a normal connection state with a circuit in the electronic device (i.e., the first end of the NFC coil 12 is in a normal connection state with the first end of the NFC driving module 11, and the second end of the NFC coil 12 is in a normal connection state with the ground), the first end of the detection module 14 (i.e., the TP1 end as shown in fig. 5 a) is connected to the ground through the NFC coil 12.
At this time, the second switch P2 is turned on due to the grounded gate, so that the sys terminal of the detection module 14 is turned on with the grounded terminal, and the sys terminal has a low level, i.e. the sys terminal of the detection module 14 will transmit the low level to the control unit 13. In other words, in the present embodiment, the third electric signal is a low-level signal.
Accordingly, when the coil 12 is in an abnormal connection state with a circuit in the electronic device (i.e., the first end of the NFC coil 12 is in an abnormal connection state with the first end of the NFC driving module 11 and/or the second end of the NFC coil 12 is in an abnormal connection state with the second end of the NFC driving module 11), the TP1 end is not grounded through the NFC coil 12.
At this time, the power VCC supplies a high level to the control terminal of the second switch P2 through the fourth resistor R4, so that the second switch P2 is turned off due to the high level of the gate thereof, and the sys terminal of the detection module 14 is turned off from the ground terminal, and at this time, since the sys terminal of the detection module 14 is grounded through the sixth resistor R6 and pulled up to the power VCC through the fifth resistor R5, the sys terminal of the detection module 14 has a high level, i.e., the sys terminal of the detection module 14 will transmit a high level to the control unit 13. That is, in the present embodiment, the second electric signal is a high-level signal.
In this embodiment, in the first operating state, the second switch P2 is turned on; in the second operating state, the second switch P2 is turned off; and the second electrical signal is greater than the third electrical signal;
the low level and the high level are level values with respect to each other, that is, the level value of the high level signal is higher than the level value of the low level signal, and specific values of the low level signal and the high level signal are not limited thereto.
The present embodiment is suitable for an application scenario in which the first end of the NFC coil 12 is connected to the NFC driving module 11, and the second end of the NFC coil 12 is grounded, at this time, the detection module 14 is connected to the first end of the NFC coil 12, so that when the NFC coil 12 is in place, the characteristic that the NFC coil 12 is fixed to be conducted with the grounding end is used to adjust the voltage of the control end of the second switch P2, so that the second switch P2 is conducted or disconnected along with the in-place situation of the NFC coil 12, so as to respectively transmit level signals with different values to the control unit 13 when the NFC coil 12 is in place and out of place, and thus the control unit determines the in-place situation of the NFC coil 12 according to the value of the received level signal.
It should be noted that the second switch may be a PMOS transistor, or may be an NMOS transistor.
For example: as shown in fig. 5b, the second switch N2 in this embodiment is an NMOS transistor. In this way, when the coil 12 is in a normal connection state with the circuit in the electronic device, the control terminal of the second switch N2 is grounded through the NFC coil 12, so that the second switch N2 is turned off, and the sys terminal of the detection module 14 is further turned off from the ground terminal, at this time, since the sys terminal of the detection module 14 is grounded through the sixth resistor R6 and pulled up to the power VCC through the fifth resistor R5, the sys terminal has a high level, that is, the sys terminal of the detection module 14 will transmit the high level to the control unit 13. In other words, in the present embodiment, the third electric signal is a high-level signal.
Accordingly, in the embodiment shown in fig. 5b, when the coil 12 and the circuit in the electronic device are in the abnormal connection state, the TP1 end is not grounded, so that the power VCC provides a high level to the control end of the second switch N2 through the fourth resistor R4, so that the second switch N2 is turned on due to the high level of the gate thereof, and further the sys end of the detection module 14 is turned on with the ground, and the sys end of the detection module 14 will transmit a low level to the control unit 13. In other words, in the present embodiment, the second electric signal is a low-level signal.
In this embodiment, in the first operating state, the second switch N2 is turned off; in the second working state, the second switch N2 is conducted; and the second electrical signal is less than the third electrical signal.
The embodiment is also applicable to an application scenario in which the first end of the NFC coil 12 is connected to the NFC driving module 11, the second end of the NFC coil 12 is grounded, and the detection module 14 is connected to the first end of the NFC coil 12, so as to respectively transmit level signals with different values to the control unit 13 when the NFC coil 12 is in place and out of place, so that the control unit determines the in-place condition of the NFC coil 12 according to the values of the received level signals.
The embodiment of the application also provides electronic equipment, which comprises the detection circuit as shown in any one of fig. 1 to 5 b.
It should be noted that, as with the eighth resistor R8 in the implementation shown in fig. 2a and 2b, a ninth resistor R9 may be disposed between TP1 and the gates of the second switches (P2, N2) in the circuit shown in fig. 5a and 5b, so as to provide gate protection to the second switches (P2, N2) through the ninth resistor R9, so as to avoid an overcurrent flowing through the gates of the second switches (P2, N2).
The electronic equipment that this embodiment of application provided can detect the in-place condition of NFC coil to detect this NFC coil under the unset condition, close the NFC function, in order to avoid starting the NFC function under the unusual circumstances of being connected between NFC coil and NFC drive module, can prevent NFC drive module output unusual power and lead to the fact the damage to electronic equipment and NFC drive module itself, thereby can promote electronic equipment's reliability.
Please refer to fig. 6, which is a flowchart of an NFC function control method provided in an embodiment of the present application, where the NFC function control method can be applied to any detection circuit provided in an embodiment of the present application, as shown in fig. 6, the NFC function control method may include the following steps:
step 601, determining a connection state of the NFC coil based on the value of the electrical signal detected by the second end of the detection module.
Step 602, controlling the NFC driving module to be in a closed state when the connection state of the NFC coil is abnormal.
The abnormal connection state of the NFC coil has the same meaning as the abnormal connection state of the NFC coil in the detection circuit shown in fig. 1, that is, the method specifically may include: the connection state between the NFC coil and the NFC driving module is abnormal.
In practical application, when the connection state between the NFC coil and the NFC driving module is normal, the NFC driving module may be controlled to be in a normal working state.
Optionally, the method further comprises:
and outputting prompt information under the condition that the connection state of the NFC coil is abnormal.
The prompt information is used for prompting that the on-site situation of the NFC coil is abnormal, and/or the NFC coil is loose, and/or prompting a user to carry out maintenance treatment to an after-sales department, and the like.
According to the NFC function control method provided by the embodiment of the application, various processes in any detection circuit implementation mode can be realized, the NFC function is started under the condition that connection between the NFC coil and the NFC driving module is abnormal, abnormal power output by the NFC driving module can be prevented from damaging the electronic equipment and the NFC driving module, and accordingly reliability of the electronic equipment can be improved.
Optionally, as shown in fig. 7, the embodiment of the present application further provides an electronic device 700, including a processor 701, a memory 702, and a program or an instruction stored in the memory 702 and capable of running on the processor 701, where the program or the instruction implements each process of the above-mentioned NFC function control method embodiment when executed by the processor 701, and the process can achieve the same technical effect, and for avoiding repetition, a description is omitted herein.
It should be noted that, the electronic device in the embodiment of the present application includes the mobile electronic device and the non-mobile electronic device described above.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction realizes each process of the above embodiment of the NFC function control method, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to run a program or an instruction, implement each process of the above embodiment of the NFC function control method, and achieve the same technical effect, so as to avoid repetition, and not be repeated here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), including several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (12)

1. A detection circuit, comprising: the NFC device comprises a near field communication NFC driving module, an NFC coil, a control unit and a detection module;
the output end of the control unit is connected with the control end of the NFC driving module, the first end of the NFC driving module is connected with the first end of the NFC coil, the first end of the detection module is connected with the first end of the NFC coil, and the second end of the detection module is connected with the input end of the control unit;
the detection module provides a first electric signal to the first end of the NFC coil, and the second end of the detection module transmits a second electric signal to the input end of the control unit under the condition that the electric signal value on the NFC coil meets a preset condition, and the control unit controls the NFC driving module to be in a closed state based on the second electric signal;
the electric signal value on the NFC coil meets a preset condition, and the connection of the NFC coil is in an abnormal state;
wherein, the detection module includes: a power supply and a switching unit;
when the first end of the NFC coil and the first end of the NFC driving module are in an abnormal connection state and/or the second end of the NFC coil and the second end of the NFC driving module are in an abnormal connection state, the switching unit is in a first working state, so that the second end of the detection module obtains the second electric signal from the power supply;
When the first end of the NFC coil and the first end of the NFC driving module are in a normal connection state and/or the second end of the NFC coil and the second end of the NFC driving module are in a normal connection state, the switching unit is in a second working state, so that the second end of the detection module obtains a third electric signal from the power supply, and the control unit controls the NFC driving module to be in the working state based on the third electric signal.
2. The detection circuit of claim 1, wherein a second terminal of the NFC drive module is connected to a second terminal of the NFC coil, and a third terminal of the detection module is connected to the second terminal of the NFC coil.
3. The detection circuit of claim 1, wherein the second terminal of the NFC coil is grounded.
4. The detection circuit according to claim 2, wherein the switching unit includes: the first switch, the first resistor, the second resistor and the third resistor;
the power supply is connected with the first end of the NFC coil through the first resistor, the second end of the NFC coil is connected with the control end of the first switch, the first end of the first switch is connected with the power supply through the second resistor, the second end of the first switch is grounded, the second end of the detection module is connected with the first end of the first switch, and the second end of the detection module is grounded through the third resistor;
When the first end of the NFC coil and the first end of the NFC driving module are in an abnormal connection state and/or the second end of the NFC coil and the second end of the NFC driving module are in an abnormal connection state, the first switch is in the first working state, so that the second end of the detection module transmits the second electric signal to the input end of the control unit;
when the first end of the NFC coil and the first end of the NFC driving module are in a normal connection state and the second end of the NFC coil and the second end of the NFC driving module are in a normal connection state, the first switch is in the second working state, so that the second end of the detection module transmits the third electric signal to the input end of the control unit.
5. The detection circuit of claim 4, wherein:
the first switch is a PMOS tube;
in the first working state, the PMOS tube is conducted; in the second working state, the PMOS tube is disconnected; and the second electrical signal is less than the third electrical signal;
or,
the first switch is an NMOS tube;
in the first working state, the NMOS tube is disconnected; in the second working state, the NMOS tube is conducted; and the second electrical signal is greater than the third electrical signal.
6. A detection circuit according to claim 3, wherein the switching unit comprises: the second switch, the fourth resistor, the fifth resistor and the sixth resistor;
the power supply is connected with the first end of the NFC coil through the fourth resistor, the first end of the NFC coil is also connected with the control end of the second switch, the first end of the second switch is connected with the power supply through the fifth resistor, the second end of the second switch is grounded, the second end of the detection module is connected with the first end of the second switch, and the second end of the detection module is grounded through the sixth resistor;
when the first end of the NFC coil and the first end of the NFC driving module are in an abnormal connection state and/or the second end of the NFC coil and the grounding end are in an abnormal connection state, the second switch is in the first working state, so that the second end of the detection module transmits the second electric signal to the input end of the control unit;
when the first end of the NFC coil and the first end of the NFC driving module are in a normal connection state and the second end of the NFC coil and the grounding end are in a normal connection state, the second switch is in the second working state, so that the second end of the detection module transmits the third electric signal to the input end of the control unit.
7. The detection circuit of claim 6, wherein:
the second switch is a PMOS tube;
in the first working state, the PMOS tube is conducted; in the second working state, the PMOS tube is disconnected; and the second electrical signal is greater than the third electrical signal;
or,
the second switch is an NMOS tube;
in the first working state, the NMOS tube is disconnected; in the second working state, the NMOS tube is conducted; and the second electrical signal is less than the third electrical signal.
8. An electronic device comprising the detection circuit according to any one of claims 1 to 6.
9. A near field communication NFC function control method, applied to the detection circuit according to any one of claims 1 to 6, comprising:
determining a connection state of the NFC coil based on the electrical signal value detected by the second end of the detection module;
and under the condition that the connection state of the NFC coil is abnormal, controlling the NFC driving module to be in a closed state.
10. The method according to claim 9, wherein the method further comprises:
And outputting prompt information under the condition that the connection state of the NFC coil is abnormal.
11. An electronic device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the near field communication, NFC, function control method according to claim 9 or 10.
12. A readable storage medium, characterized in that a program or instructions is stored on the readable storage medium, which when executed by a processor, implements the steps of the near field communication NFC functionality control method according to claim 9 or 10.
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