Device based on NFC antenna coupling power supply control

Abstract

The utility model discloses a device based on NFC antenna coupling power supply control. The device comprises a radio frequency energy collection module of an NFC card unit, an energy conversion module, a photoelectric isolation switch unit, a power supply module, a microcontroller and at least one preset function module. The power supply module is electrically connected with the microcontroller and the preset function module; the input end of the energy conversion module is connected with the radio frequency energy collection module, the radio frequency energy collection module is used for converting a wireless electric field into alternating-current electric energy when the NFC card unit senses the card reading device, and the energy conversion module is used for converting alternating-current voltage of the alternating-current electric energy into direct-current voltage; the output end of the energy conversion module is connected with the input end of the photoelectric isolation switch unit; the photoelectric isolation switch unit is used for controlling the power supply module to supply power; and the microcontroller is connected with the preset function module and is used for controlling the preset function module to work, so that consumer applications such as music playing can be controlled through NFC card swiping, and the NFC application range is greatly expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to NFC technical field, concretely for based on NFC antenna coupling power supply control's device. BACKGROUND

[0002] The proximity IC card technology based on NFC technology has been widely applied in the fields of traffic cards, access control cards, electronic consumer cards, bank cards and the like. However, the currently directly applied traffic cards are usually a standard card or a special-shaped card with different patterns, and the card functions have been single for a long time, which limits the application of the card. Therefore, the extended application of the NFC card technology has become the research direction of technical personnel. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a kind of based on NFC antenna coupling power supply control's device, alternating energy obtained from card reader by NFC antenna when NFC card is swiped is converted into direct current, and MCU is driven photoelectric coupler by direct current to control work, to control the function of various application modules, and the application range of NFC card technology is expanded.

[0004] To achieve the above object, the utility model provides a kind of based on NFC antenna coupling power supply control's device, comprising: the radio frequency energy collection module of NFC card unit, energy conversion module, photoelectric isolation switch unit, power module, microcontroller and at least one preset function module;

[0005] The power module is electrically connected with the microcontroller and the at least one preset function module;

[0006] The input end of the energy conversion module is connected with the radio frequency energy collection module, and the radio frequency energy collection module is used to convert radio field into alternating current energy when the NFC card unit inductive card reading device, and the energy conversion module is used to convert the alternating voltage of the alternating current energy into direct current voltage;

[0007] The output end of the energy conversion module is connected with the input end of the photoelectric isolation switch unit, and the photoelectric isolation switch unit is used to control the power supply of the power module;

[0008] The microcontroller is connected with the at least one preset function module, and is used to control the preset function module work.

[0009] As an embodiment, the energy conversion module includes: the radio frequency input end, half-wave rectification unit, filter capacitor and first current-limiting resistor;

[0010] The radio frequency input end is connected with the radio frequency energy collection module; after receiving an alternating voltage, the radio frequency input end rectifies through a half-wave rectification unit to convert the alternating voltage into a direct current voltage, a filter capacitor is connected with an output end of the half-wave rectification unit to smooth the direct current voltage, and a first current limiting resistor is connected at an output end of the filter capacitor.

[0011] As an embodiment, the photoelectric isolation switch unit is an optocoupler; an input end of the optocoupler is connected with an output end of the energy conversion module, one end of an output end of the optocoupler is grounded, and the other end outputs an on-off control signal; the device further comprises a switching triode, an on-off control pin of the optocoupler is connected with a base of the switching triode through a second current limiting resistor, the base of the switching triode is further connected with a power supply end through a base bias resistor, a collector of the switching triode is connected with the power supply end, and an emitter of the switching triode is connected with a power supply end of a microcontroller.

[0012] As an embodiment, the device further comprises an LED indication circuit; the LED indication circuit comprises a third current limiting resistor and an LED, the emitter of the switching triode is connected with the third current limiting resistor and the LED, and a negative electrode of the LED is grounded.

[0013] As an embodiment, the at least one preset function module comprises one or more of an audio playing module, a TFT display module or an LED marquee light module.

[0014] As an embodiment, the power supply module is a button cell.

[0015] Compared with the prior art, the device has the following beneficial effects:

[0016] The device based on NFC antenna coupling power supply control provided in the embodiment of the utility model, the radio frequency energy collection module of the NFC card unit is used for converting a radio field into an alternating current energy when the NFC card unit inductively reads the card device, the energy conversion module is used for converting the alternating current energy into a direct current signal, an output end of the energy conversion module is connected with an input end of the photoelectric isolation switch unit, the photoelectric isolation switch unit is used for controlling the power supply module to supply power to the MCU, so that the MCU controls various applications such as audio playing, a marquee light and picture display, thereby greatly expanding the application capability of the NFC card, and making the NFC of the device also serve as a switch module of the device, so that the mechanical switch structure of the device can be cancelled. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The functional block diagram of the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure.

[0019] Figure 2 The structural diagram of the radio frequency energy collection module of the NFC card unit in the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure.

[0020] Figure 3 The circuit principle diagram of the energy conversion module in the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure.

[0021] Figure 4 The on-off structure diagram of the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure.

[0022] Figure 5 The structural diagram of the MCU of the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure.

[0023] Figure 6 The structural diagram of the audio playing module of the device based on NFC antenna coupling power supply control according to the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0025] Please refer to Figures 1-6 The device based on NFC antenna coupling power supply control provided by the present application comprises a radio frequency energy collection module 10, an energy conversion module 20, an optical isolation switch unit 30, a power module 40, a microcontroller 50 and at least one preset function module 60.

[0026] The input end of the energy conversion module 20 is connected with the radio frequency energy collection module 10 of the NFC card unit, the radio frequency energy collection module 10 is used for converting the radio field into alternating current energy when the NFC card unit is inducted by the card reading device, the energy conversion module 20 is used for converting the alternating voltage of the alternating current energy into direct current voltage, the output end of the energy conversion module 20 is connected with the input end of the photoelectric isolation switch unit 30, the photoelectric isolation switch unit 30 is used for controlling the power supply module 40 to supply power to the electric module such as the microcontroller 50. The microcontroller 50 is connected with at least one preset function module 60 and is used for controlling the preset function module 60 to work.

[0027] As shown in Figure 2 When the NFC card unit is swiped by the card reader 70, the radio frequency energy collection module 10 includes an L / C circuit, which is used for converting the 13.56Mhz radio field into alternating current energy when the NFC card unit is inducted by the card reading device. Specifically, the NFC card unit transmits energy through L / C coupling ionosphere, obtains alternating energy, and then outputs the alternating energy to the radio frequency input end RF of the energy conversion module 20 through the output end of the radio frequency energy collection module 10 of the NFC card unit, so as to realize the reception and transmission of energy.

[0028] As shown in Figure 3 The energy conversion module 20 can include a radio frequency input end, a half-wave rectification unit D2, a filter capacitor C3 and a first current limiting resistor R8. The radio frequency input end is connected with the radio frequency energy collection module 10 of the NFC, specifically, the output end 11 of the radio frequency energy collection module 10 of the NFC card unit is connected with the 1 pin of the radio frequency input end RF1 of the energy conversion module 20, and the output end 12 of the radio frequency energy collection module 10 is connected with the 2 pin of the radio frequency input end RF1 of the energy conversion module 20. After the radio frequency input end receives the alternating voltage, the half-wave rectification unit D2 is used for rectifying the alternating voltage to convert the alternating voltage into pulsating direct current voltage, the filter capacitor C3 is connected with the output end of the half-wave rectification unit D2 and is used for smoothing the pulsating direct current voltage to form stable direct current voltage, the first current limiting resistor R8 is connected with the output end of the filter capacitor C3 and is used for current limiting, and the output end of the energy conversion module 20 is the anode P and the cathode N.

[0029] As shown in Figure 4As shown, the photoelectric isolation switch unit 30 comprises: a photoelectric coupler U1, the input end of the photoelectric coupler U1 is connected to the positive pole P and the negative pole N of the output end of the energy conversion module 20, one end of the output end of the photoelectric coupler U1 is grounded, and the other end outputs an ON / OFF signal, ON indicates that the triode in U1 is turned on, and OFF indicates that the triode in U1 is turned off. The device based on NFC antenna coupling power supply control in the embodiment can further comprise: a switching triode Q2, the ON / OFF pin of the photoelectric coupler U1 is connected to the base of the switching triode Q2 through a second current limiting resistor R1, the base of the switching triode Q2 is further connected to the power supply end Vdd through a base bias resistor R5, R5 is the base bias resistor of Q2, the collector of Q2 is connected to Vdd, the base is connected to the output end of the photoelectric coupler U1 through the second current limiting resistor R1, and the emitter is connected to the power supply end Vcc of the microcontroller (Microcontroller Unit, MCU), Vcc is used to supply power to the microcontroller 50. The device based on NFC antenna coupling power supply control can further comprise an LED indication circuit, the LED indication circuit can comprise: a third current limiting resistor R4 and an LED, the negative pole of the LED is grounded, and the LED is used to indicate the ON / OFF state of the photoelectric coupler U1 or the power supply state of the microcontroller 50. R4 is the current limiting resistor of the LED, and C1 is a filter capacitor. When U1 is turned on, Q2 is turned on, so that Vcc is connected to Vdd to supply power to the Vcc of the MCU, at the same time, the LED is lighted, when U1 is turned off, the power supply of the Vcc of the MCU is disconnected, and the LED is extinguished, thereby indicating the power supply control state of the device.

[0030] The preset function module 60 can comprise one or more of an audio playing module, a TFT display module or an LED marquee module. It can be understood that the embodiment does not make specific limitation on the preset function module. As shown in the figure, Figure 5 As shown, after the Vcc of the MCU obtains the working voltage, different application programs burned in are started, and the serial receiving port Rx1 and the serial sending port Tx1 port are controlled according to the requirements of the control program to control other application functions.

[0031] As shown in the figure, Figure 6 The circuit diagram of the music playing module is shown in the figure, after the music playing chip U3 is powered on, the control signals output by the serial sending port Tx1 and the serial receiving port Rx1 of the MCU are connected to Tx2 and Rx2 of U3, and then music or circular playing is played according to the protocol of the music playing chip, and the playing time is controllable.

[0032] The power module of the device based on NFC antenna coupling power supply control in the embodiment adopts a button cell, and other power modules can also be adopted, which are not specifically limited here.

[0033] Specifically, the music playing module comprises a music playing chip U3 and a power filter capacitor C2, a serial receiving port Rx2 port and a serial sending port Tx2 port are connected to the 2nd pin of the U3 and the 3rd pin of the U3 respectively, the 8th pin of the U3 is connected with Vcc and the fourth current limiting resistor R6, one end of the R6 is connected with the 7th pin of the U3 and the decoupling capacitor C4 respectively, the 5th pin of the U3 and the 6th pin of the U3 are connected with a loudspeaker SPK, and the 5th pin of the U3 is connected with an audio path control switch K2.

[0034] In one example, the device based on NFC antenna coupling power supply control can further comprise: an NFC card unit, that is, the NFC card unit is integrated with the MCU and other functional modules. It can be understood that the NFC card unit can also be a separate module, and the NFC card unit is connected with the device based on NFC antenna coupling power supply control through a wire, which is not limited here.

[0035] The working process of the device based on NFC antenna coupling power supply control in the embodiment of the utility model is as follows:

[0036] Step one, the NFC card unit is swiped in the antenna end of the 13.56 MHz card reader 70, the NFC card antenna obtains alternating energy from the card reader 70, and then outputs to the radio frequency input end RF of the energy conversion module through the output end of the radio frequency energy collection module 10 of the NFC card unit, rectifies the obtained alternating current energy through D2, and then outputs direct current after current limiting through the first current limiting resistor R8;

[0037] Step two, the direct current is input to the input end of the photoelectric coupler U1, the ON / OFF pin of the photoelectric coupler U1 is connected with the switching triode Q2, so as to control the conduction or block of the LED indicating photoelectric coupler U1; when the photoelectric coupler U1 is turned on, the MCU starts to work, and the program of the MCU is used to control the output state of the functional module; when the photoelectric coupler U1 is disconnected, the MCU stops working and enters the sleep state. After the Vcc of the MCU obtains the working voltage, the different application programs burned in are started, and the control signals output from the Rx1 and Tx1 ports are used to control other application functions according to the control program; the control signals output from the Tx1 and Rx1 of the MCU are connected with the Tx2 and Rx2 of the music playing chip, and then the music playing chip plays music and plays in a loop according to the protocol of the music playing chip, and the playing time is controllable. It can be understood that the functional module can also be a marquee or a TFT display screen lamp, and the specific application module of the device is not limited here.

[0038] Compared with the prior art, the device based on NFC antenna coupling power supply control has the advantages that: the NFC card unit is used for card swiping at the antenna end of the 13.56 MHz card reader, the energy obtained by the NFC card antenna is half-wave rectified and current-limited to output direct current, the positive / negative (i.e. P / N) end of the direct current is connected into the photoelectric coupler U1 for conduction to control the battery to supply power to the MCU, various output states are controlled through the program of the MCU, such as music playing. The signal control of the serial receiving port Rx and the serial sending port Tx is used to realize the needs of on-demand song playing and various cycle playing. The device based on NFC antenna coupling power supply control can not only be applied to audio playing, but also be used for LED running light control, or picture display control, greatly improves the application scene of the NFC card, and brings better user experience to the NFC card (bus card). The electricity of the NFC card is isolated through the photoelectric coupler, the structure is simple, the safety is high, the device can be applied to various bus cards, the NFC card can be combined with various consumer applications, and the application range of the NFC card is greatly expanded.

[0039] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A device based on NFC antenna coupling power supply control, characterized in that, The device comprises: a radio frequency energy collection module, an energy conversion module, an optoelectronic isolation switch unit, a power module, a microcontroller, and at least one preset function module of the NFC card unit; the power module is electrically connected with the microcontroller and the at least one preset function module; an input end of the energy conversion module is connected with the radio frequency energy collection module, the radio frequency energy collection module is used to convert a radio field into an alternating current energy when the NFC card unit is inductively read by a card reading device, and the energy conversion module is used to convert an alternating voltage of the alternating current energy into a direct current voltage; an output end of the energy conversion module is connected with an input end of the optoelectronic isolation switch unit, and the optoelectronic isolation switch unit is used to control power supply of the power module; the microcontroller is connected with the at least one preset function module and is used to control work of the preset function module.

2. The apparatus of claim 1, wherein, The energy conversion module comprises a radio frequency input end, a half-wave rectification unit, a filter capacitor, and a first current-limiting resistor; the radio frequency input end is connected with the radio frequency energy collection module; after receiving an alternating voltage, the radio frequency input end rectifies the alternating voltage through the half-wave rectification unit to convert the alternating voltage into a direct current voltage, the filter capacitor is connected with an output end of the half-wave rectification unit and is used to smooth the direct current voltage, and the first current-limiting resistor is connected at an output end of the filter capacitor.

3. The apparatus of claim 1, wherein, The optoelectronic isolation switch unit is an optoelectronic coupler; an input end of the optoelectronic coupler is connected with an output end of the energy conversion module, one end of an output end of the optoelectronic coupler is grounded, and the other end outputs an on-off control signal; the device further comprises a switching triode, an on-off control pin of the optoelectronic coupler is connected with a base of the switching triode through a second current-limiting resistor, the base of the switching triode is further connected with a power supply end through a base bias resistor, a collector of the switching triode is connected with the power supply end, and an emitter of the switching triode is connected with a power supply end of the microcontroller.

4. The apparatus of claim 3, wherein, The device further comprises an LED indication circuit; the LED indication circuit comprises a third current-limiting resistor and an LED, the emitter of the switching triode is connected with the third current-limiting resistor and the LED, and a negative electrode of the LED is grounded.

5. The apparatus of claim 1, wherein, The at least one preset function module comprises one or more of an audio playing module, a TFT display module, or an LED scrolling display module.

6. The apparatus of claim 1, wherein, The power module is a button cell.

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