CN116390073A - Passive NFC chip, control method of passive NFC chip and passive NFC equipment - Google Patents
Passive NFC chip, control method of passive NFC chip and passive NFC equipment Download PDFInfo
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- CN116390073A CN116390073A CN202310379519.4A CN202310379519A CN116390073A CN 116390073 A CN116390073 A CN 116390073A CN 202310379519 A CN202310379519 A CN 202310379519A CN 116390073 A CN116390073 A CN 116390073A
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- 238000004146 energy storage Methods 0.000 claims abstract description 136
- 230000001360 synchronised effect Effects 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 59
- 230000008859 change Effects 0.000 claims description 10
- 230000002596 correlated effect Effects 0.000 claims description 6
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- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
- G06K19/0707—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation
- G06K19/0708—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation the source being electromagnetic or magnetic
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- 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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Abstract
The embodiment of the application provides a passive NFC chip, a control method of the passive NFC chip and passive NFC equipment, wherein the passive NFC chip comprises an energy storage module; the discharging switch is arranged between the energy storage module and the external driving circuit and used for controlling the energy storage module to be connected or disconnected with the external driving circuit; the input end of the attenuation element is connected with the output end of the energy storage module, and the attenuation amount of the attenuation element is synchronous with the attenuation amount of the energy storage module; the voltage configuration circuit is used for generating a reference voltage; the first input end of the comparison circuit is connected with the output end of the attenuation element, the second input end of the comparison circuit is connected with the output end of the voltage configuration circuit, and the output end of the comparison circuit is connected with the discharge switch; when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit; when the voltage of the first input end of the comparison circuit is not greater than the reference voltage, the discharging switch is turned off to enable the energy storage module to not supply power to the external driving circuit.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and in particular, to a passive NFC chip, a control method of the passive NFC chip, and a passive NFC device.
Background
Since near field communication (Near Field Communication, NFC) uses a magnetic field as an information carrier, a communication distance (several centimeters) much shorter than that of conventional wireless communication is achieved, and the near field communication has the advantages of passive communication, high security, wide use and the like. Therefore, applications based on NFC technology are also becoming more widespread, such as new fingerprint cards, new visual cards, smart wearable devices, passive NFC smart locks, passive electronic ink tags, etc.
Typically, a passive NFC chip is capable of receiving radio frequency energy from an active passive NFC chip to power itself and external loads. However, the energy storage module in the passive NFC chip has aging attenuation after a long time of use, which results in that the passive NFC chip cannot meet the use requirement.
Disclosure of Invention
The embodiment of the application provides a passive NFC chip, a control method of the passive NFC chip and passive NFC equipment, which can solve the problem that the passive NFC chip cannot meet the use requirement due to aging of an existing energy storage module.
The embodiment of the application provides a passive NFC chip, the passive NFC chip includes:
an energy storage module;
the discharging switch is arranged between the energy storage module and the external driving circuit and used for controlling the energy storage module to be connected or disconnected with the external driving circuit;
the input end of the attenuation element is connected with the output end of the energy storage module, and the attenuation amount of the attenuation element is synchronous with the attenuation amount of the energy storage module;
a voltage configuration circuit for generating a reference voltage;
the first input end of the comparison circuit is connected with the output end of the attenuation element, the second input end of the comparison circuit is connected with the output end of the voltage configuration circuit, and the output end of the comparison circuit is connected with the discharge switch;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit;
when the voltage of the first input end of the comparison circuit is not greater than the reference voltage, the discharge switch is turned off so that the energy storage module does not supply power to the external driving circuit.
Optionally, the attenuation element includes a TFT, an input end of the TFT is connected to an output end of the energy storage module, and an output end of the TFT is connected to a first input end of the comparison circuit.
Optionally, the energy storage module includes a first capacitor and a second capacitor, the attenuation element includes a first TFT and a second TFT, the attenuation of the first TFT is synchronous with the attenuation of the first capacitor, and the attenuation of the second TFT is synchronous with the attenuation of the second capacitor;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the output end of the first capacitor is connected with the discharge switch, the output end of the second capacitor is disconnected with the discharge switch, the first TFT is turned on, and the second TFT is turned off;
when the voltage of the first input end of the comparison circuit is not larger than the reference voltage, the first capacitor is disconnected from the discharge switch, the second capacitor is connected with the discharge switch, the first TFT is cut off, and the second TFT is switched on.
Optionally, the energy storage module includes a first capacitor and a second capacitor, the attenuation element includes a first TFT and a second TFT, the attenuation of the first TFT is synchronous with the attenuation of the first capacitor, and the attenuation of the first TFT and the attenuation of the second TFT are synchronous with the attenuation of the first capacitor and the attenuation of the second capacitor;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the output end of the first capacitor is connected with the discharge switch, and the first TFT is conducted;
when the voltage of the first input end of the comparison circuit is not larger than the reference voltage, the output end of the first capacitor connected in parallel with the second capacitor is connected with the discharge switch, and the first TFT and the second TFT are connected in series and then are conducted.
The embodiment of the application also provides a passive NFC chip, which comprises:
an energy storage module;
the discharging switch is arranged between the energy storage module and the external driving circuit and used for controlling the energy storage module to be connected or disconnected with the external driving circuit;
the voltage configuration circuit is used for generating a reference voltage, wherein the reference voltage is regulated according to the attenuation of the energy storage module so that the change trend of the reference voltage is opposite to the change trend of the attenuation;
and when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit.
Optionally, the voltage configuration circuit includes a plurality of branches, each of which has a different voltage across it, and adjusts the reference voltage by turning on a different branch.
Optionally, the passive NFC chip includes a timer, where the timer is connected to the energy storage module, and the timer is used to time a working time of the energy storage module;
and adjusting the amplitude of the reference voltage to be positively correlated with the working time.
The embodiment of the application also provides a control method of the passive NFC chip, wherein the passive NFC chip comprises an energy storage module, a discharging switch, a voltage configuration circuit and a comparison circuit, and the control method comprises the following steps:
obtaining the attenuation of the energy storage module;
acquiring a reference voltage of a voltage configuration circuit;
and adjusting the reference voltage according to the attenuation amount so that the change trend of the reference voltage is opposite to the change trend of the attenuation amount.
Optionally, the passive NFC chip includes a timer, where the timer is connected to the energy storage module, and the adjusting the reference voltage according to the attenuation includes:
acquiring the working time length of the energy storage module through the timer;
and adjusting the reference voltage according to the working time, wherein the amplitude of the reference voltage is adjusted to be positively correlated with the working time.
The embodiment of the application also provides a passive NFC device, which comprises:
a driving circuit;
a passive NFC chip, as claimed in any preceding claim, for powering the drive circuit.
The beneficial effects of this application lie in: the passive NFC chip comprises an energy storage module, a discharge switch, an attenuation element, a voltage configuration circuit and a comparison circuit, wherein the discharge switch is arranged between the energy storage module and an external driving circuit and is used for controlling the energy storage module to be connected or disconnected with the external driving circuit, the input end of the attenuation element is connected with the output end of the energy storage module, the attenuation amount of the attenuation element is synchronous with the attenuation amount of the energy storage module, the voltage configuration circuit is used for generating reference voltage, the first input end of the comparison circuit is connected with the output end of the attenuation element, the second input end of the comparison circuit is connected with the output end of the voltage configuration circuit, and the output end of the comparison circuit is connected with the discharge switch; when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit; when the voltage of the first input end of the comparison circuit is not greater than the reference voltage, the discharging switch is turned off to enable the energy storage module to not supply power to the external driving circuit. According to the embodiment of the application, the attenuation amount of the attenuation element is synchronous with the attenuation amount of the energy storage module, and the voltage at the two ends of the attenuation element after attenuation is compared with the reference voltage to judge whether the current energy storage module can start the external circuit or not, so that the energy storage module in attenuation can start the external circuit in the range that the voltage at the two ends of the attenuation element is higher than the reference voltage, and the situation that the passive NFC chip cannot be used due to attenuation of the energy storage module is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts throughout the following description.
Fig. 1 is a schematic diagram of a first structure of a passive NFC chip provided in an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of the passive NFC chip shown in fig. 1.
Fig. 3 is a schematic diagram of a second structure of a passive NFC chip according to an embodiment of the present application.
Fig. 4 is a schematic circuit diagram of the passive NFC chip shown in fig. 3.
Fig. 5 is a flowchart of a control method of a passive NFC chip according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The aging attenuation of the energy storage module in the passive NFC interface is more and more serious along with the longer service time, so that the energy storage module cannot meet the service requirement after a long time.
Therefore, in order to solve the above-mentioned problems, the present application proposes a passive NFC chip, a control method of the passive NFC chip, and a passive NFC device. The present application is further described below with reference to the drawings and embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic flow chart of a control method of an energy storage module according to an embodiment of the present application, and fig. 2 is a schematic circuit structure diagram of a passive NFC chip shown in fig. 1. The embodiment of the application provides a passive NFC chip 100, where the passive NFC chip 100 includes an energy storage module 10, a discharge switch 30, an attenuation element 20, a voltage configuration circuit 50 and a comparison circuit 40, where the discharge switch 30 is disposed between the energy storage module 10 and an external driving circuit 200 and is used to control the energy storage module 10 to be connected or disconnected with the external driving circuit 200, an input end of the attenuation element 20 is connected with an output end of the energy storage module 10, an attenuation amount of the attenuation element 20 is synchronous with an attenuation amount of the energy storage module 10, the voltage configuration circuit 50 is used to generate a reference voltage, a first input end of the comparison circuit 40 is connected with an output end of the attenuation element 20, a second input end of the comparison circuit 40 is connected with an output end of the voltage configuration circuit 50, and an output end of the comparison circuit 40 is connected with the discharge switch 30; when the voltage of the first input end of the comparison circuit 40 is greater than the reference voltage, the discharge switch 30 is turned on to enable the energy storage module 10 to supply power to the external driving circuit 200; when the voltage of the first input terminal of the comparison circuit 40 is not greater than the reference voltage, the discharge switch 30 is turned off to make the energy storage module 10 not supply power to the external driving circuit 200. According to the embodiment of the application, the attenuation amount of the attenuation element 20 is synchronous with the attenuation amount of the energy storage module 10, and the voltage at the two ends of the attenuation element 20 is compared with the reference voltage to judge whether the current energy storage module 10 can start an external circuit or not, so that the energy storage module 10 in attenuation can also start the external circuit in the range that the voltage at the two ends of the attenuation element 20 is higher than the reference voltage, and the situation that the passive NFC chip 100 cannot be used due to the attenuation of the energy storage module 10 is avoided.
It can be understood that, in the embodiment of the present application, the voltage at two ends of the attenuation element 20 is compared with the reference voltage, so that the attenuated energy storage module 10 can also start an external circuit, and the driving reliability is ensured. On the basis, the attenuation of the energy storage module 10 can be represented by the voltage at two ends of the attenuation element 20 through the synchronous attenuation of the attenuation element 20 and the energy storage module 10, so that the energy storage module 10 can be continuously used within a period of time after attenuation, and the situation that the energy storage module 10 cannot be used after attenuation is avoided.
The energy storage module 10 is an important component in the whole passive NFC chip 100, so the attenuation of the energy storage module 10 is a relatively important parameter, wherein in implementation, the energy storage module 10 can preferably select an energy storage capacitor, the capacitance value of the energy storage capacitor can be preferably selected within the range of 22 μf-0.47F, the specific capacitance value can be selected according to actual needs, and the larger the capacity of the capacitor can store more electric energy, the better the smoothing effect.
The attenuation of the energy storage module 10 refers to the loss of the energy storage module 10 under normal conditions. The attenuation is the percentage of the fluctuation amplitude of the regulated quantity which is reduced after each fluctuation period. I.e. the ratio of the difference between the previous amplitude minus the latter amplitude of two adjacent waves in the same direction to the previous amplitude.
In some embodiments, the damping element 20 comprises a TFT, an input of which is connected to the output of the energy storage module 10, and an output of which is connected to a first input of the comparison circuit 40. The attenuation of the TFT is synchronous with the attenuation of the energy storage module 10, and the voltage at two ends of the TFT can be compared with the reference voltage to judge whether the attenuated energy storage module 10 can supply power to the external driving circuit 200, so that the power supply quality of the energy storage module 10 can be ensured, the energy storage module 10 can be ensured to be used in a certain attenuation range, and the utilization rate of the energy storage module 10 is improved. And the TFT is simple and convenient to use, so that the cost is low.
The comparison circuit 40 may be one or more comparators, where the specific number of comparators may be set according to the actual situation, which is not particularly limited herein.
In some embodiments, the energy storage module 10 includes a first capacitor and a second capacitor, wherein an output end of the first capacitor is connected to the discharge switch 30, and an output end of the second capacitor is disconnected from the discharge switch 30; when the voltage of the first input end of the comparison circuit 40 is not greater than the reference voltage, the first capacitor is disconnected from the discharge switch 30, and the second capacitor is connected to the discharge switch 30. When the voltage at the first input end of the comparison circuit 40 is not greater than the reference voltage, that is, the attenuation of the first capacitance in the current energy storage module 10 is too great, the current first capacitance cannot meet the power supply requirement of the external driving circuit 200, and the first capacitance is disconnected from the discharge switch 30 and the second capacitance is connected with the discharge switch 30, so that the second capacitance replaces the first capacitance, and the energy storage module 10 can supply power.
It will be appreciated that when the second capacitor in the energy storage module 10 replaces the first capacitor, the attenuation element 20 needs to be replaced correspondingly, so that the attenuation of the replaced attenuation element 20 is synchronized with the attenuation of the second capacitor.
Illustratively, in some embodiments, the attenuating element 20 includes a first TFT having an amount of attenuation that is synchronized with an amount of attenuation of the first capacitance and a second TFT having an amount of attenuation that is synchronized with an amount of attenuation of the second capacitance. When the voltage of the first input end of the comparison circuit 40 is larger than the reference voltage, the output end of the first capacitor is connected with the discharge switch 30, the output end of the second capacitor is disconnected with the discharge switch 30, and the first TFT is turned on and the second TFT is turned off; when the voltage of the first input end of the comparison circuit 40 is not greater than the reference voltage, the first capacitor is disconnected from the discharge switch 30, the second capacitor is connected with the discharge switch 30, and the first TFT is turned off and the second TFT is turned on. By correspondingly replacing the damping element 20 after replacing the capacitor, the judgment of the energy storage module 10 is more accurate.
In some embodiments, the energy storage module 10 includes a first capacitor and a second capacitor, the attenuation element 20 includes a first TFT and a second TFT, the amount of attenuation of the first TFT is synchronized with the amount of attenuation of the first capacitor, and the amount of attenuation of the first TFT and the second TFT is synchronized with the amount of attenuation of the first capacitor and the second capacitor. When the voltage of the first input end of the comparison circuit 40 is greater than the reference voltage, the output end of the first capacitor is connected with the discharge switch 30, and the first TFT is turned on; when the voltage of the first input end of the comparison circuit 40 is not greater than the reference voltage, the output end of the first capacitor connected in parallel with the second capacitor is connected with the discharge switch 30, and the first TFT and the second TFT are connected in series and then turned on. The power supply capability of the energy storage module 10 is improved by connecting the first capacitor and the second capacitor in parallel, and the conduction condition of the first TFT and the second TFT is correspondingly adjusted, so that the attenuation of the attenuation element 20 is always consistent with the attenuation of the energy storage module 10, and the driving reliability of the energy storage module 10 can be improved.
With continued reference to fig. 3 and fig. 4, fig. 3 is a schematic diagram of a second structure of the passive NFC chip provided in the embodiment of the present application, and fig. 4 is a schematic diagram of a second structure of the passive NFC chip provided in the embodiment of the present application. The embodiment of the application further provides a passive NFC chip 100, where the passive NFC chip 100 includes an energy storage module 10, a discharge switch 30, a voltage configuration circuit 50 and a comparison circuit 40, where the discharge switch 30 is disposed between the energy storage module 10 and the external driving circuit 200, and is used to control the energy storage module 10 to be connected or disconnected with the external driving circuit 200; the voltage configuration circuit 50 is configured to generate a reference voltage, where the reference voltage is adjusted according to the attenuation of the energy storage module 10, so that the variation trend of the reference voltage matches the variation trend of the attenuation; the first input end of the comparison circuit 40 is connected with the output end of the energy storage module 10, the second input end of the comparison circuit 40 is connected with the output end of the voltage configuration circuit 50, the output end of the comparison circuit 40 is connected with the discharge switch 30, and when the voltage of the first input end of the comparison circuit 40 is larger than the reference voltage, the discharge switch 30 is turned on to enable the energy storage module 10 to supply power to the external driving circuit 200. According to the embodiment of the application, the voltage configuration circuit 50 adjusts according to the attenuation of the energy storage module 10, so that the energy storage module 10 in attenuation starts the external driving circuit 200 according to different standards. For example, a lower reference voltage may be used during the early stage of use of the energy storage module 10, so that the external driving circuit 200 may be activated more quickly, and a larger reference voltage may be used during the late stage of use of the energy storage module 10, so as to ensure that the energy in the energy storage module 10 is sufficient to activate the external driving circuit 200.
The voltage configuration circuit 50 includes a plurality of branches, each branch having a different voltage across it, and adjusts the reference voltage by turning on the different branches. In some embodiments, where different branches may have different resistance values, by coupling a plurality of different resistors into the circuit to adjust the reference voltage, the voltage configuration circuit 50 may include three branches, each including a first resistor, a second resistor, and a third resistor in turn, and the reference voltage may be adjusted by coupling any combination of the first resistor, the second resistor, and the third resistor in parallel, e.g., only the first resistor, the second resistor, or the third resistor may be coupled into the circuit separately, e.g., the first resistor and the second resistor may be coupled into the circuit in parallel, and further, e.g., the first resistor, the second resistor, and the third resistor may be coupled into the circuit in parallel, etc. The specific adjustment mode may be set according to actual conditions, and is not particularly limited herein.
In some embodiments, the passive NFC chip 100 includes a timer, which is connected to the energy storage module 10 and is used to count the working time of the energy storage module 10; the amplitude of the regulating reference voltage is positively correlated with the working time. The using time of the energy storage module 10 is obtained through a timer, and the attenuation of the energy storage module 10 is obtained according to the using time of the energy storage module 10, wherein the longer the using time is, the larger the attenuation is, the larger the amplitude of the reference voltage needs to be regulated.
The usage time may be from the date of production of the energy storage module 10, or from the date when the energy storage module 10 is mounted on the passive NFC chip 100, or may be a time period when the energy storage module 10 is mounted on the passive NFC chip 100. The specific setting of the use period may be set according to actual conditions, and is not particularly limited herein.
In some embodiments, the passive NFC chip 100 further includes a measurement module, where one end of the measurement module is connected to the energy storage module 10, and the other end of the measurement module is connected to the voltage configuration circuit 50, where the measurement module is configured to measure an attenuation amount of the energy storage module 10, and the voltage configuration circuit 50 adjusts the reference voltage according to the attenuation amount. The attenuation of the energy storage module 10 is directly measured by the measuring module, so that the response speed can be increased, and the reference voltage can be adjusted more quickly.
With continued reference to fig. 5, fig. 5 is a flowchart illustrating a control method of a passive NFC chip according to an embodiment of the present application. The embodiment of the present application further provides a control method of the passive NFC chip 100, where the passive NFC chip 100 includes an energy storage module 10, a discharging switch 30, a voltage configuration circuit 50 and a comparison circuit 40, and a specific junction of the passive NFC chip 100 may refer to any one of the passive NFC chips 100 described above, which is not described herein again. The control method comprises the following specific processes:
101. and obtaining the attenuation of the energy storage module.
The attenuation amount may be directly obtained, for example, the measurement module measures the attenuation amount. It may also be indirectly obtained by other means, for example, in some embodiments, when the energy storage of the energy storage module 10 is full, the current voltage across the energy storage module 10 is obtained, and the current attenuation of the energy storage module 10 is obtained according to the mapping relationship between the voltage and the attenuation.
102. A reference voltage of the voltage configuration circuit is obtained.
In some embodiments, the reference voltage may be obtained through specific circuit connection conditions of the voltage configuration circuit 50, or the reference voltage may be obtained by directly measuring voltages at two ends of the voltage configuration circuit 50, and a specific manner may be set according to actual conditions, which is not limited herein.
103. And adjusting the reference voltage according to the attenuation amount so that the change trend of the reference voltage is opposite to the change trend of the attenuation amount.
The reference voltage is adjusted by the amount of attenuation so that the energy storage module 10 in the attenuation activates the chip or the driving circuit according to different criteria. In the early stage of use of the energy storage module 10, a lower reference voltage can be used, so that a chip or a driving circuit can be started more quickly, and in the later stage of use of the energy storage module 10, a larger reference voltage can be used, so that energy in the energy storage module 10 can be ensured to be enough to start the external driving circuit 200.
In some embodiments, the passive NFC chip 100 includes a timer, through which the operation duration of the energy storage module 10 is obtained; and adjusting the reference voltage according to the working time, wherein the amplitude of the adjusted reference voltage is positively correlated with the working time.
The embodiment of the application also provides a passive NFC device, which comprises: driver circuit and a passive NFC chip 100, the passive NFC chip 100 being a passive NFC chip 100 as described in any of the preceding claims, the passive NFC chip 100 being configured to power the driver circuit.
The passive NFC chip, the control method of the passive NFC chip, and the passive NFC device provided in the embodiments of the present application are described above in detail. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, with the description of the examples given above only to assist in understanding the present application. Meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.
Claims (10)
1. A passive NFC chip, wherein the passive NFC chip comprises:
an energy storage module;
the discharging switch is arranged between the energy storage module and the external driving circuit and used for controlling the energy storage module to be connected or disconnected with the external driving circuit;
the input end of the attenuation element is connected with the output end of the energy storage module, and the attenuation amount of the attenuation element is synchronous with the attenuation amount of the energy storage module;
a voltage configuration circuit for generating a reference voltage;
the first input end of the comparison circuit is connected with the output end of the attenuation element, the second input end of the comparison circuit is connected with the output end of the voltage configuration circuit, and the output end of the comparison circuit is connected with the discharge switch;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit;
when the voltage of the first input end of the comparison circuit is not greater than the reference voltage, the discharge switch is turned off so that the energy storage module does not supply power to the external driving circuit.
2. The passive NFC chip according to claim 1 wherein the attenuation element comprises a TFT, an input of the TFT being connected to an output of the energy storage module, an output of the TFT being connected to a first input of the comparison circuit.
3. The passive NFC chip of claim 2, wherein the energy storage module includes a first capacitor and a second capacitor, the attenuation element includes a first TFT and a second TFT, an attenuation of the first TFT is synchronized with an attenuation of the first capacitor, and an attenuation of the second TFT is synchronized with an attenuation of the second capacitor;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the output end of the first capacitor is connected with the discharge switch, the output end of the second capacitor is disconnected with the discharge switch, the first TFT is turned on, and the second TFT is turned off;
when the voltage of the first input end of the comparison circuit is not larger than the reference voltage, the first capacitor is disconnected from the discharge switch, the second capacitor is connected with the discharge switch, the first TFT is cut off, and the second TFT is switched on.
4. The passive NFC chip of claim 2, wherein the energy storage module includes a first capacitor and a second capacitor, the attenuation element includes a first TFT and a second TFT, an amount of attenuation of the first TFT is synchronized with an amount of attenuation of the first capacitor, and an amount of attenuation of the first TFT and the second TFT is synchronized with an amount of attenuation of the first capacitor and the second capacitor;
when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the output end of the first capacitor is connected with the discharge switch, and the first TFT is conducted;
when the voltage of the first input end of the comparison circuit is not larger than the reference voltage, the output end of the first capacitor connected in parallel with the second capacitor is connected with the discharge switch, and the first TFT and the second TFT are connected in series and then are conducted.
5. A passive NFC chip, wherein the passive NFC chip comprises:
an energy storage module;
the discharging switch is arranged between the energy storage module and the external driving circuit and used for controlling the energy storage module to be connected or disconnected with the external driving circuit;
the voltage configuration circuit is used for generating a reference voltage, wherein the reference voltage is regulated according to the attenuation of the energy storage module so that the change trend of the reference voltage is opposite to the change trend of the attenuation;
and when the voltage of the first input end of the comparison circuit is larger than the reference voltage, the discharge switch is conducted so that the energy storage module supplies power to the external driving circuit.
6. The passive NFC chip of claim 5 wherein the voltage configuration circuit includes a plurality of legs, each of the legs having a different voltage across it, the reference voltage being adjusted by turning on a different leg.
7. The passive NFC chip of claim 5, wherein the passive NFC chip includes a timer, the timer being coupled with the energy storage module, the timer being configured to time an operating period of the energy storage module;
and adjusting the amplitude of the reference voltage to be positively correlated with the working time.
8. A control method of a passive NFC chip, where the passive NFC chip includes an energy storage module, a discharge switch, a voltage configuration circuit, and a comparison circuit, the control method includes:
obtaining the attenuation of the energy storage module;
acquiring a reference voltage of a voltage configuration circuit;
and adjusting the reference voltage according to the attenuation amount so that the change trend of the reference voltage is opposite to the change trend of the attenuation amount.
9. The control method of claim 8, wherein the passive NFC chip includes a timer, the timer being coupled to the energy storage module, the adjusting the reference voltage according to the amount of attenuation comprising:
acquiring the working time length of the energy storage module through the timer;
and adjusting the reference voltage according to the working time, wherein the amplitude of the reference voltage is adjusted to be positively correlated with the working time.
10. A passive NFC device, the passive NFC device comprising:
a driving circuit;
a passive NFC chip according to any of claims 1 to 7, for powering the driver circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310379519.4A CN116390073A (en) | 2023-03-31 | 2023-03-31 | Passive NFC chip, control method of passive NFC chip and passive NFC equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310379519.4A CN116390073A (en) | 2023-03-31 | 2023-03-31 | Passive NFC chip, control method of passive NFC chip and passive NFC equipment |
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| WO2017177655A1 (en) * | 2016-04-15 | 2017-10-19 | 中兴通讯股份有限公司 | Electronic tag, and power supply management method and apparatus for electronic tag |
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| CN115085770A (en) * | 2021-03-15 | 2022-09-20 | 上海复旦微电子集团股份有限公司 | Passive NFC interface and device |
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| WO2017177655A1 (en) * | 2016-04-15 | 2017-10-19 | 中兴通讯股份有限公司 | Electronic tag, and power supply management method and apparatus for electronic tag |
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