CN114844530A - Passive NFC interface and passive NFC device - Google Patents
Passive NFC interface and passive NFC device Download PDFInfo
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- CN114844530A CN114844530A CN202110135676.1A CN202110135676A CN114844530A CN 114844530 A CN114844530 A CN 114844530A CN 202110135676 A CN202110135676 A CN 202110135676A CN 114844530 A CN114844530 A CN 114844530A
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Abstract
The invention provides a passive NFC interface and a passive NFC device. The passive NFC interface includes: a power utilization module; the NFC antenna is used for establishing communication connection with the active NFC equipment and inducing electromagnetic field energy from the active NFC equipment to generate induced voltage so as to supply power to the power utilization module; the regulating module is used for limiting the power supply current of the power utilization module when the communication connection is unstable and canceling the limitation when the communication connection is stable. The invention has the beneficial effect. For example, when the communication connection between the passive NFC interface and the active NFC device is unstable, the power supply current transmitted to the power utilization module by the rectification module may be limited by the adjustment module, so as to avoid the problems that the passive NFC interface and the passive NFC device including the passive NFC interface cannot be powered on or communication fails; and when the communication connection is stable, the limitation on the power supply current can be cancelled through the adjusting module, so that the power supply capacity and the power supply efficiency of the passive NFC interface are improved.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a passive NFC interface and passive NFC equipment.
Background
Because NFC (Near Field Communication) uses a magnetic Field as an information carrier, a Communication distance (several centimeters) much shorter than that of conventional wireless Communication is realized, and the NFC has the advantages of passive Communication, high security, wide use, and the like. Consequently, NFC-based applications are also becoming more widespread, such as NFC payments, NFC pairing, NFC electronic price tags, NFC electronic ink screens, NFC smart locks, and the like.
An important part of the NFC standard is the traditional inheritance of a high Frequency RFID (Radio Frequency Identification) passive interface, which allows communication between an NFC reader interface and an NFC passive interface. However, in a conventional NFC passive interface, on one hand, the NFC device cannot be powered on and communication fails due to an excessive current load when the NFC device enters the field, and on the other hand, when the NFC device performs energy collection, the energy conversion efficiency is also low.
Disclosure of Invention
It is an object of the present invention to overcome the above technical problems by providing an improved passive NFC interface and passive NFC device.
The passive NFC interface provided by the embodiment of the invention comprises: a power utilization module; the NFC antenna is used for establishing communication connection with the active NFC equipment and inducing electromagnetic field energy from the active NFC equipment to generate induced voltage so as to supply power to the power utilization module; the regulating module is used for limiting the power supply current of the power utilization module when the communication connection is unstable and canceling the limitation when the communication connection is stable.
Optionally, the adjusting module comprises: a current limiting unit for limiting a supply current; and a switching unit for causing the current limiting unit to limit the supply current when the communication connection is unstable, and short-circuiting the current limiting unit to cancel the limitation when the communication connection is stable.
Optionally, the current limiting unit includes a current limiting resistor, and the switching unit includes a PMOS transistor connected in parallel with the current limiting resistor; the source electrode of the PMOS tube is connected with the NFC antenna, the drain electrode of the PMOS tube is connected with the electricity utilization module, and the grid electrode of the PMOS tube is suitable for closing the PMOS tube when the communication connection is unstable and conducting the PMOS tube when the communication connection is stable.
Optionally, the passive NFC interface includes a control module connected to a gate of the PMOS transistor, and is configured to output a first control signal to the gate of the PMOS transistor when the communication connection is unstable and output a second control signal to the gate of the PMOS transistor when the communication connection is stable; the first control signal is used for controlling the PMOS tube to be closed, and the second control signal is used for controlling the PMOS tube to be conducted.
Optionally, the passive NFC interface includes an obtaining module connected to the control module, and configured to obtain a communication state between the NFC interface and the active NFC device; the control module is used for generating a first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the communication state is unstable, and generating a second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the communication state is stable.
Optionally, the passive NFC interface includes an obtaining module connected to the control module, and configured to obtain a state of the induced voltage; the control module is used for generating a first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the induced voltage is unstable, and generating a second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the induced voltage is stable.
Optionally, the passive NFC interface includes an obtaining module connected to the control module, and configured to obtain power supply time of the power utilization module; the control module is used for generating a first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the power supply time is less than a first threshold value, and generating a second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the power supply time is greater than or equal to the first threshold value.
Optionally, the power consuming module is an energy storage capacitor, and the first threshold is a time constant of the energy storage capacitor and the current limiting resistor.
Optionally, the passive NFC interface includes an obtaining module connected to the control module, and configured to obtain a power supply voltage of the power utilization module; the control module is used for generating a first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the power supply voltage is smaller than a second threshold value, and generating a second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the power supply voltage is larger than or equal to the second threshold value.
Optionally, the power module comprises an energy storage unit and/or a load unit.
The passive NFC device provided by the embodiment of the invention comprises the passive NFC interface.
Optionally, the passive NFC device includes a passive electronic screen, a passive electronic lock, and a passive wearable device.
Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects.
For example, when the communication connection between the passive NFC interface and the active NFC device is unstable, the supply current transmitted to the power utilization module by the rectification module may be limited by the adjustment module, so as to avoid the problems that the passive NFC interface and the passive NFC device including the passive NFC interface cannot be powered on or communication fails. And when the communication connection between the passive NFC interface and the active NFC equipment is stable, the limitation on the power supply current can be cancelled through the adjusting module, so that the power supply capacity and the power supply efficiency of the passive NFC interface are improved.
For another example, the PMOS transistor is used as a switch unit in the adjusting module, which not only simplifies the circuit structure and is beneficial to reducing the cost, but also improves the power supply efficiency and power supply capability and reduces the energy loss.
For another example, because the passive NFC interface has a strong power supply capability, a large-capacity capacitor may be used as an energy storage unit to store all the electromagnetic field energy received by the passive NFC interface in the form of electric energy, thereby improving the energy utilization rate.
For another example, whether the communication connection between the NFC interface and the active NFC device is stable may be determined by the communication state between the NFC interface and the active NFC device, the state of the induced voltage generated by the NFC antenna, the charging time of the energy storage capacitor, and the power supply voltage of the power consuming module, so as to timely limit the power supply current of the power consuming module when the communication connection is unstable, and timely cancel the limitation when the communication connection is stable.
For another example, the technical means for determining whether the communication connection between the NFC interface and the active NFC device is stable is simple and easy to operate.
Drawings
Fig. 1 is a schematic block diagram of a passive NFC interface in an embodiment of the invention;
fig. 2 is a second functional block diagram of a passive NFC interface in an embodiment of the invention;
fig. 3 is a third functional block diagram of a passive NFC interface in an embodiment of the invention;
fig. 4 is a fourth functional block diagram of a passive NFC interface in an embodiment of the invention;
fig. 5 is a fifth functional block diagram of a passive NFC interface in an embodiment of the present invention;
fig. 6 is a sixth functional block diagram of a passive NFC interface in an embodiment of the present invention;
fig. 7 is a seventh schematic block diagram of a passive NFC interface in an embodiment of the present invention.
Detailed Description
As described in the background art, in a conventional NFC passive interface, on one hand, problems such as incapability of powering on the NFC device and communication failure due to an excessive current load may occur at the moment of entering the NFC device, and on the other hand, when the NFC device performs energy collection, the energy conversion efficiency is also very low.
Unlike the prior art, the present invention provides an improved passive NFC interface and passive NFC device. The passive NFC interface provided by the embodiment of the invention comprises: a power utilization module; the NFC antenna is used for establishing communication connection with the active NFC equipment and inducing electromagnetic field energy from the active NFC equipment to generate induced voltage so as to supply power to the power utilization module; the regulating module is used for limiting the power supply current of the power utilization module when the communication connection is unstable and canceling the limitation when the communication connection is stable.
Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effect.
For example, when the communication connection between the passive NFC interface and the active NFC device is unstable, the supply current transmitted to the power utilization module by the rectification module may be limited by the adjustment module, so as to avoid the problems that the passive NFC interface and the passive NFC device including the passive NFC interface cannot be powered on or communication fails. And when the communication connection between the passive NFC interface and the active NFC equipment is stable, the limitation on the power supply current can be cancelled through the adjusting module, so that the power supply capacity and the power supply efficiency of the passive NFC interface are improved.
In order to make the objects, features and advantages of the embodiments of the present invention more comprehensible, specific embodiments accompanied with figures are described in detail below.
Referring to fig. 1, a passive NFC interface 100 provided in an embodiment of the present invention may include an NFC antenna 110, a regulation module 120, and a power utilization module 130, which are connected in sequence.
Specifically, the NFC antenna 110 is configured to establish a communication connection with an active NFC device and induce electromagnetic field energy from the active NFC device to generate an induced voltage to power the power-using module 130. The adjusting module 120 is configured to limit the supply current of the power utilization module 130 when the communication connection between the NFC antenna 110 and the active NFC device is unstable, and to cancel the limitation when the communication connection between the NFC antenna 110 and the active NFC device is stable. The power utilization module 130 is used to store or consume the electric energy based on the induced voltage.
In a specific implementation, the active NFC device may be an NFC terminal having a power source. For example, a handset supporting NFC functionality.
In a specific implementation, the active NFC device may be brought into proximity with the passive NFC interface 100 to bring the NFC antenna 110 of the passive NFC interface 100 into an electromagnetic field generated by the active NFC device, thereby allowing the active NFC device to establish a communication connection with the passive NFC interface and allowing the passive NFC interface 100 to harvest electromagnetic field energy from the active NFC device.
In an implementation, the NFC antenna 110 is configured to induce electromagnetic field energy from an active NFC device and generate an induced voltage based on the electromagnetic field energy. Specifically, the induced voltage is a radio frequency alternating current voltage.
Referring to fig. 2, the passive NFC interface 100 may further include a matching module 140 and a rectifying module 150, which are sequentially connected between the NFC antenna 110 and the adjusting module 120.
Specifically, the matching module 140 is configured to adjust the resonant frequency of the NFC antenna 110 to 13.56MHz, so as to improve the energy receiving efficiency of the NFC antenna 110. The rectifying module 150 is configured to rectify the ac induced voltage generated by the NFC antenna 110 into a dc voltage to power the power consuming module 130.
In some embodiments, the matching module 140 may employ a capacitor.
In some embodiments, the rectification module 150 may employ a bridge rectifier or a synchronous rectifier.
In an implementation, the dc voltage rectified by the rectifying module 150 is transmitted to the power consumption module 130 through the regulating module 120.
Specifically, the adjusting module 120 is configured to limit the power supply current of the power utilization module 130 when the communication connection between the NFC antenna 110 and the active NFC device is unstable, and to cancel the limitation when the communication connection between the NFC antenna 110 and the active NFC device is stable.
Generally, when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, if the direct voltage rectified by the rectifying module 150 is directly transmitted to the power-using module 130, the situation that the current load in the passive NFC interface 100 and the passive NFC device including the passive NFC interface 100 is too large may occur, so that the passive NFC device cannot be powered on, and the communication fails (for example, the communication is failed to send back due to too large current load, and the communication is sent back by mistake).
Specifically, the situation where the communication connection between the passive NFC interface 100 and the active NFC device is unstable may include a moment when the NFC antenna 110 of the passive NFC interface 100 enters an electromagnetic field generated by the active NFC device, and a situation where the current load suddenly increases after the communication connection between the passive NFC interface 100 and the active NFC device is stable, resulting in a drop of the induced voltage of the NFC antenna 110.
In some embodiments, the instant the NFC antenna 110 of the passive NFC interface 100 enters the electromagnetic field generated by the active NFC device includes the instant the NFC antenna 110 is brought into the electromagnetic field when the active NFC device is actively initiating a communication connection, and also includes the instant the NFC antenna 110 reenters the electromagnetic field after the communication connection between the passive NFC interface 100 and the active NFC device is broken due to the need to re-establish the communication connection.
In the embodiment of the present invention, when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, the adjusting module 120 may limit the supply current transmitted by the rectifying module 150 to the power consuming module 130, so as to avoid the problems that the passive NFC interface 100 and the passive NFC device including the passive NFC interface 100 cannot be powered on or fail in communication. Moreover, when the communication connection between the passive NFC interface 100 and the active NFC device is stable, the adjustment module 120 may also cancel the limitation on the supply current, so as to improve the power supply capability and the power supply efficiency of the passive NFC interface 100.
Referring to fig. 3, the adjusting module 120 may include a current limiting unit 121 and a switching unit 122 connected in parallel.
Specifically, the current limiting unit 121 is used to limit the supply current transmitted from the rectifying module 150 to the power consuming module 130. The switching unit 122 is configured to enable the current limiting unit 121 to operate to limit the supply current delivered to the power consuming module 130 by the rectifying module 150 when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, and to short-circuit the current limiting unit 121 to remove the limitation on the supply current delivered to the power consuming module 130 by the rectifying module 150 when the communication connection between the passive NFC interface 100 and the active NFC device is stable.
Referring to fig. 4, the current limiting unit 121 may include a current limiting resistor. The switching unit 122 may include a PMOS transistor connected in parallel with a current limiting resistor; the source of the PMOS transistor is connected to the rectifying module 150, the drain of the PMOS transistor is connected to the power consumption module 130, and the gate of the PMOS transistor is adapted to turn off the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, and turn on the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is stable.
In a specific implementation, when the PMOS transistor is turned off, the passive NFC interface 100 forms an open circuit at the switching unit 122. In this case, the current output from the rectifying module 150 can reach the power consuming module 130 only through the current limiting unit 121.
Since the current output from the rectifying module 150 is reduced by the energy loss when passing through the current limiting resistor of the current limiting unit 121, the magnitude of the supply current transmitted from the rectifying module 150 to the power consuming module 130 is limited.
Specifically, the magnitude of the supply current to the power-consuming module 130 is related to the resistance of the current-limiting resistor. In the embodiment of the present invention, it is a minimum requirement that when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, the passive NFC interface 100 and the passive NFC device including the passive NFC interface 100 are not affected to be normally powered on and communicate.
In a specific implementation, the determination of the resistance value of the current-limiting resistor may be implemented by using a conventional technical means in the art, and is not described herein again.
In a specific implementation, when the PMOS transistor is turned on, the passive NFC interface 100 forms a path at the switching unit 122 and thus short-circuits the current limiting unit 121. In this case, the current output from the rectifying module 150 reaches the power consuming module 130 through the PMOS transistor.
Since there is no current limitation and no energy loss when the current output from the rectifying module 150 reaches the power consumption module 130 through the PMOS transistor, the power supply efficiency of the rectifying module 150 to the power consumption module 130 can be increased, and the power supply capability of the rectifying module 150 to the power consumption module 130 can be improved and the energy loss can be reduced. Thereby, the power efficiency, power capability of the passive NFC interface 100 and the passive NFC device comprising it may be improved and have a low power consumption.
In an embodiment of the present invention, the power utilization module 130 may include an energy storage unit and/or a load unit. The energy storage unit is configured to store electromagnetic field energy received by the passive NFC interface 100 in the form of electric energy (that is, the electromagnetic field energy received by the passive NFC interface 100 is converted into an induction voltage and is rectified and then transmitted to the energy storage unit to be stored), and the load unit is configured to consume the electromagnetic field energy received by the passive NFC interface 100 (that is, the electromagnetic field energy received by the passive NFC interface 100 is converted into an induction voltage and is rectified and then transmitted to the load unit to directly supply power to the load unit).
Referring to fig. 5, in some embodiments, the power module 130 may include an energy storage unit 131.
In a specific implementation, the energy storage unit 131 may adopt a large-capacity capacitor and is charged by the adjusting module 120 to store all electromagnetic field energy received by the passive NFC interface 100 in the form of electric energy, so as to improve energy utilization.
Referring to fig. 6, in some embodiments, the power consuming module 130 includes a load unit 132 connected in parallel with the energy storage unit 131 in addition to the energy storage unit 131.
In an implementation, the load unit 132 is configured to directly dissipate electromagnetic field energy received by the passive NFC interface 100 in the form of electrical energy.
In some embodiments, the load unit 132 may include a load such as an electronic screen, an electronic lock, or the like, adapted to consume power.
In other embodiments, the power module 130 may also include only a load unit.
In other embodiments, the loading unit 132 may be further disposed in a passive NFC device including the passive NFC interface 100, and connected to the passive NFC interface 100 through the energy storage unit 131 to consume power through the energy storage unit 131.
Referring to fig. 7, in some embodiments, the passive NFC interface 100 may further include a control module 160 connected to the gate of the PMOS transistor.
Specifically, the control module 160 is configured to output a first control signal to the gate of the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, and output a second control signal to the gate of the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is stable. The first control signal is used for controlling the PMOS tube to be closed, and the second control signal is used for controlling the PMOS tube to be conducted.
In other embodiments, the control module 160 may be further disposed in the passive NFC device including the passive NFC interface 100 and connected to the gate of the PMOS transistor in the passive NFC interface 100, so as to output a first control signal to the gate of the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is unstable, and output a second control signal to the gate of the PMOS transistor when the communication connection between the passive NFC interface 100 and the active NFC device is stable.
In a specific implementation, the passive NFC interface 100 or the passive NFC device including the passive NFC interface 100 may further include an acquisition module connected to the control module 160.
In some embodiments, the acquisition module may be configured to acquire a communication state between the NFC interface 100 and an active NFC device. In this case, the control module 160 is configured to generate a first control signal and output the first control signal to the gate of the PMOS transistor when the communication state between the NFC interface 100 and the active NFC device is unstable, and generate a second control signal and output the second control signal to the gate of the PMOS transistor when the communication state between the NFC interface 100 and the active NFC device is stable.
In a specific implementation, the process of acquiring the communication state between the NFC interface 100 and the active NFC device by the acquiring module may be implemented by using a conventional technical means in the art, and details are not described here.
In some embodiments, the acquiring module may be further configured to acquire a state of an induced voltage generated by the NFC antenna 100 inducing electromagnetic field energy from the active NFC device. In this case, the control module 160 is configured to generate and output a first control signal to the gate of the PMOS transistor when the induced voltage is unstable (when the induced voltage is unstable, the communication connection between the passive NFC interface 100 and the active NFC device is also unstable), and generate and output a second control signal to the gate of the PMOS transistor when the induced voltage is stable (when the induced voltage is stable, the communication connection between the passive NFC interface 100 and the active NFC device is also stable).
In some embodiments, when the power consuming module 130 includes an energy storage capacitor (e.g., when the power consuming module 130 includes the energy storage unit 131 and the energy storage unit 131 adopts a capacitor), the obtaining module may further obtain a power supply time of the power consuming module 130 (i.e., a charging time of the energy storage capacitor). In this case, the control module 160 is configured to generate a first control signal and output the first control signal to the gate of the PMOS transistor when the power supply time is less than the first threshold, and generate a second control signal and output the second control signal to the gate of the PMOS transistor when the power supply time is greater than or equal to the first threshold.
In a specific implementation, a resistance value of the current limiting resistor in the current limiting unit 121 is denoted as R, and a capacitance value of the energy storage capacitor in the power utilization module 130 is denoted as C.
In some embodiments, the first threshold may be a time constant RC of the storage capacitor and the current limiting resistor. Typically, the communication connection between the passive NFC interface 100 and the active NFC device is already in a stable state when the power up time of the power consuming module 130 is greater than or equal to RC.
In some embodiments, the obtaining module may also be used to obtain a supply voltage of the power consuming module 130. In this case, the control module 160 is configured to generate a first control signal and output the first control signal to the gate of the PMOS transistor when the supply voltage is less than the second threshold, and generate a second control signal and output the second control signal to the gate of the PMOS transistor when the supply voltage is greater than or equal to the second threshold.
Specifically, the voltage across the power-consuming module 130 may be directly collected as its supply voltage. When the supply voltage is greater than or equal to a certain threshold (i.e., a second threshold), the communication connection between the passive NFC interface 100 and the active NFC device is in a stable state.
In specific implementations, the specific value of the second threshold can be determined by means of ordinary techniques and experience in the art, and will not be described herein.
In summary, it can be known that whether the communication connection between the NFC interface 100 and the active NFC device is stable can be determined through the communication state between the NFC interface 100 and the active NFC device, the state of the induced voltage generated by the NFC antenna 100, the charging time of the energy storage capacitor, and the power supply voltage of the power utilization module 130, so as to timely limit the power supply current of the power utilization module when the communication connection is unstable, and timely cancel the limitation when the communication connection is stable.
In the embodiment of the present invention, the manner of determining whether the communication connection between the NFC interface 100 and the active NFC device is stable is not limited to the above-disclosed technical means, and includes any conventional technical means known in the art.
The embodiment of the invention also provides the passive NFC equipment.
Specifically, the passive NFC device includes the passive NFC interface 100 provided by the embodiment of the present invention.
In particular implementations, the passive NFC device may include a passive electronic screen with NFC functionality, a passive electronic lock, a passive wearable device, and the like.
While specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless differently stated. In particular implementations, the features of one or more dependent claims may be combined with the features of the independent claims in any suitable manner, depending on the practical requirements, and the features from the respective independent claims may be combined, not merely by the specific combinations enumerated in the claims.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A passive NFC interface, comprising:
a power utilization module;
the NFC antenna is used for establishing communication connection with an active NFC device and inducing electromagnetic field energy from the active NFC device to generate induced voltage so as to supply power to the power utilization module;
a regulation module to limit a supply current of the power utilization module when the communication connection is unstable and to cancel the limitation when the communication connection is stable.
2. The passive NFC interface of claim 1, wherein the adjustment module comprises: a current limiting unit to limit the supply current;
a switching unit for causing the current limiting unit to limit the supply current when the communication connection is unstable, and short-circuiting the current limiting unit to cancel the limitation when the communication connection is stable.
3. The passive NFC interface of claim 2 wherein the current limiting unit comprises a current limiting resistor and the switching unit comprises a PMOS transistor in parallel with the current limiting resistor; the source electrode of the PMOS tube is connected with the NFC antenna, the drain electrode of the PMOS tube is connected with the electricity utilization module, and the grid electrode of the PMOS tube is suitable for closing the PMOS tube when the communication connection is unstable and conducting the PMOS tube when the communication connection is stable.
4. The passive NFC interface of claim 3, comprising a control module connected to the gate of the PMOS transistor to output a first control signal to the gate of the PMOS transistor when the communication connection is unstable and to output a second control signal to the gate of the PMOS transistor when the communication connection is stable; the first control signal is used for controlling the PMOS tube to be closed, and the second control signal is used for controlling the PMOS tube to be conducted.
5. The passive NFC interface of claim 4, comprising an acquisition module connected to the control module to acquire a communication status between the NFC interface and the active NFC device; the control module is used for generating the first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the communication state is unstable, and generating the second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the communication state is stable.
6. The passive NFC interface of claim 4, comprising an acquisition module connected to the control module to acquire the state of the induced voltage; the control module is used for generating the first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the induction voltage is unstable, and generating the second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the induction voltage is stable.
7. The passive NFC interface according to claim 4, comprising an acquisition module connected to the control module for acquiring a power supply time of the power consuming module; the control module is used for generating the first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the power supply time is less than a first threshold value, and generating the second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the power supply time is greater than or equal to the first threshold value.
8. The passive NFC interface of claim 7, wherein the power consuming module is a storage capacitor, and wherein the first threshold is a time constant of the storage capacitor and the current limiting resistor.
9. The passive NFC interface according to claim 4, comprising an obtaining module connected to the control module for obtaining a supply voltage of the power consuming module; the control module is used for generating the first control signal and outputting the first control signal to the grid electrode of the PMOS tube when the power supply voltage is smaller than a second threshold value, and generating the second control signal and outputting the second control signal to the grid electrode of the PMOS tube when the power supply voltage is larger than or equal to the second threshold value.
10. The passive NFC interface according to any of claims 1 to 9 wherein the power consuming module comprises an energy storage unit and/or a load unit.
11. A passive NFC device characterized in that it comprises a passive NFC interface according to any of claims 1 to 10.
12. The passive NFC device of claim 11 comprising a passive electronic screen, a passive electronic lock, and a passive wearable device.
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Application publication date: 20220802 |