Low-power intelligent wireless linkage circuit based on NFC triggering

Abstract

The utility model discloses a low -power consumption intelligence wireless linkage circuit based on NFC trigger, including main control module, main control module electricity connection has NFC response module, wireless communication module and power management module, and NFC response module electricity connection has NFC antenna, and power management module gives main control module, NFC response module and wireless communication module provide voltage, in the utility model, NFC response module includes matching sensing circuit and transceiver chip, and can be matched with NFC antenna through matching sensing circuit, to realize reliable NFC response trigger, adjusts the capacitance of tenth electric capacity simultaneously, can adjust the matching impedance of matching sensing circuit to the re -matching NFC antenna, has improved the practicality of circuit, not only like this, the model of transceiver chip is EM4094, can carry out NFC response and NFC signal transmission, has realized NFC trigger and sends, has improved the practicality of circuit.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, specifically to a low-power intelligent wireless linkage circuit based on NFC triggering. Background Technology

[0002] Devices that integrate wireless technology with smart wireless chips represent a promising and high-potential area. NFC, with its convenient triggering method, low power consumption, security, and excellent complementarity with other wireless technologies, has become an ideal entry point for the Internet of Things, smart devices, and interactive experiences.

[0003] In existing NFC sensing circuits, receiving and transmitting are independent processes, which increases the production cost of the circuit. Moreover, over time, the matching resistance inside the NFC sensing circuit will change, leading to NFC sensing insensitivity in later stages.

[0004] In summary, a low-power intelligent wireless linkage circuit based on NFC triggering was designed. Utility Model Content

[0005] To overcome the above-mentioned shortcomings, this utility model provides a low-power intelligent wireless linkage circuit based on NFC triggering.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A low-power intelligent wireless linkage circuit based on NFC triggering includes a main control module, which is electrically connected to an NFC sensing module, a wireless communication module, and a power management module. The NFC sensing module is electrically connected to an NFC antenna, and the power management module provides voltage to the main control module, the NFC sensing module, and the wireless communication module.

[0008] The main control module uses an STM32FRBT6 MCU.

[0009] The NFC sensing module includes a matching sensing circuit and a transceiver chip. The transceiver chip is model EM4094. The transceiver chip is electrically connected to the NFC antenna through the matching sensing circuit and is also electrically connected to the main control module.

[0010] Preferably, the matching sensing circuit includes a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a first inductor, and a second inductor. The ANT1 terminal of the transceiver chip is electrically connected to the NFC antenna in sequence through the tenth capacitor, the first inductor, and the second inductor. The ANT2 terminal of the transceiver chip is electrically connected to the tenth capacitor and the first inductor in turn through the eleventh capacitor. The RFIN1 terminal of the transceiver chip is electrically connected to the twelfth capacitor and the thirteenth capacitor in turn. The RFIN2 terminal of the transceiver chip is electrically connected to the fifteenth capacitor and the sixteenth capacitor in turn. One end of the second inductor is grounded through the twelfth capacitor and the thirteenth capacitor, and the other end of the second inductor is electrically connected to the NFC antenna. The other end of the second inductor is also grounded through the fifteenth capacitor and the sixteenth capacitor in turn. One end of the fourteenth capacitor is grounded, and the other end of the fourteenth capacitor is electrically connected to the first inductor and the second inductor in turn.

[0011] Preferably, the tenth capacitor is an adjustable capacitor.

[0012] Preferably, the EN, DIN, DCLK, DOUT, and DOUT1 terminals of the transceiver chip are electrically connected to the signal input terminals of the MCU.

[0013] Preferably, the VDDA1 terminal of the transceiver chip is connected to an external 5V DC power supply, the VSSA1 terminal of the transceiver chip is grounded, and a first capacitor and a second capacitor are connected in parallel between the VDDA1 terminal and the VSSA1 terminal of the transceiver chip.

[0014] Preferably, the VDDA2 terminal of the transceiver chip is connected to an external 5V DC power supply, the VSSA2 terminal of the transceiver chip is grounded, and a third capacitor and a fourth capacitor are connected in parallel between the VDDA2 terminal and the VSSA2 terminal of the transceiver chip.

[0015] Preferably, the VDD terminal of the transceiver chip is connected to an external 5V DC power supply, the VSS terminal of the transceiver chip is grounded, a seventh capacitor and an eighth capacitor are connected in parallel between the VDD terminal and the VSS terminal of the transceiver chip, and the AGD terminal of the transceiver chip is grounded through a ninth capacitor.

[0016] Preferably, the OSCOUT terminal of the transceiver chip is electrically connected to the OSCIN terminal of the transceiver chip via a crystal oscillator, the OSCOUT terminal of the transceiver chip is grounded via a fifth capacitor, and the OSCIN terminal of the transceiver chip is grounded via a sixth capacitor.

[0017] The beneficial effects of this utility model are as follows: In this low-power intelligent wireless linkage circuit based on NFC triggering, the NFC sensing module includes a matching sensing circuit and a transceiver chip. The matching sensing circuit can be matched with the NFC antenna to achieve reliable NFC sensing triggering. At the same time, adjusting the capacitance of the tenth capacitor can adjust the matching impedance of the matching sensing circuit, thereby re-matching the NFC antenna and improving the practicality of the circuit. Moreover, the transceiver chip is model EM4094, which can perform NFC sensing and NFC signal transmission, realizing NFC triggering and transmission, and improving the practicality of the circuit. Attached Figure Description

[0018] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a system schematic diagram of this utility model;

[0020] Figure 2 This is a circuit diagram of the NFC sensing module of this utility model. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] like Figure 1 and Figure 2 As shown, a low-power intelligent wireless linkage circuit based on NFC triggering includes a main control module, which is electrically connected to an NFC sensing module, a wireless communication module, and a power management module. The NFC sensing module is electrically connected to an NFC antenna Y1. The power management module provides voltage to the main control module, the NFC sensing module, and the wireless communication module. The NFC sensing module is used to sense NFC trigger signals through the NFC antenna Y1 or to send signals through the NFC antenna Y1. The main control module can wirelessly connect to an external communication terminal through the wireless communication module.

[0023] The main control module uses an STM32FRBT6 MCU.

[0024] The NFC sensing module includes a matching sensing circuit and a transceiver chip U1. The transceiver chip U1 is model EM4094. The transceiver chip U1 is electrically connected to the NFC antenna Y1 through the matching sensing circuit. The transceiver chip U1 is also electrically connected to the main control module. The transceiver chip U1 is matched to the NFC antenna Y1 through the matching sensing circuit.

[0025] Specifically, the matching sensing circuit includes a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a first inductor L1, and a second inductor L2. The ANT1 terminal of the transceiver chip U1 is electrically connected to the NFC antenna Y1 through the tenth capacitor C10, the first inductor L1, and the second inductor L2 in sequence. The ANT2 terminal of the transceiver chip U1 is electrically connected to the tenth capacitor C10 and the first inductor L1 through the eleventh capacitor C11. The RFIN1 terminal of the transceiver chip U1 is connected to the twelfth capacitor C16. 2 and the thirteenth capacitor C13 are electrically connected. The RFIN2 terminal of the transceiver chip U1 is electrically connected to the fifteenth capacitor C15 and the sixteenth capacitor C16 respectively. One end of the second inductor L2 is grounded through the twelfth capacitor C12 and the thirteenth capacitor C13. The other end of the second inductor L2 is electrically connected to the NFC antenna Y1. The other end of the second inductor L2 is grounded through the fifteenth capacitor C15 and the sixteenth capacitor C16 respectively. One end of the fourteenth capacitor C14 is grounded. The other end of the fourteenth capacitor C14 is electrically connected to the first inductor L1 and the second inductor L2 respectively. The matching sensing circuit performs impedance matching according to the NFC antenna Y1.

[0026] Specifically, the tenth capacitor C10 is an adjustable capacitor. As time goes by, the impedance of the NFC antenna Y1 will change. At this time, by adjusting the capacitance value of the tenth capacitor C10, the matching impedance of the matching sensing circuit can be adjusted, thereby re-matching the NFC antenna Y1.

[0027] Specifically, the EN, DIN, DCLK, DOUT, and DOUT1 terminals of the transceiver chip U1 are electrically connected to the signal input terminals of the MCU.

[0028] Specifically, the VDDA1 terminal of the transceiver chip U1 is connected to an external 5V DC power supply, the VSSA1 terminal of the transceiver chip U1 is grounded, and a first capacitor C1 and a second capacitor C2 are connected in parallel between the VDDA1 terminal and the VSSA1 terminal of the transceiver chip U1.

[0029] Specifically, the VDDA2 terminal of the transceiver chip U1 is connected to an external 5V DC power supply, the VSSA2 terminal of the transceiver chip U1 is grounded, and a third capacitor C3 and a fourth capacitor C4 are connected in parallel between the VDDA2 terminal and the VSSA2 terminal of the transceiver chip U1.

[0030] Specifically, the VDD terminal of the transceiver chip U1 is connected to an external 5V DC power supply, the VSS terminal of the transceiver chip U1 is grounded, and a seventh capacitor C7 and an eighth capacitor C8 are connected in parallel between the VDD terminal and the VSS terminal of the transceiver chip U1. The AGD terminal of the transceiver chip U1 is grounded through a ninth capacitor C9.

[0031] Specifically, the OSCOUT terminal of the transceiver chip U1 is electrically connected to the OSCIN terminal of the transceiver chip U1 through a crystal oscillator. The OSCOUT terminal of the transceiver chip U1 is grounded through a fifth capacitor, and the OSCIN terminal of the transceiver chip U1 is grounded through a sixth capacitor C6.

[0032] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-power intelligent wireless linkage circuit based on NFC triggering, characterized in that: It includes a main control module, which is electrically connected to an NFC sensing module, a wireless communication module, and a power management module. The NFC sensing module is electrically connected to an NFC antenna, and the power management module provides voltage to the main control module, the NFC sensing module, and the wireless communication module. The main control module uses an STM32FRBT6 MCU. The NFC sensing module includes a matching sensing circuit and a transceiver chip. The transceiver chip is model EM4094. The transceiver chip is electrically connected to the NFC antenna through the matching sensing circuit and is also electrically connected to the main control module.

2. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The matching sensing circuit includes a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a first inductor, and a second inductor. The ANT1 terminal of the transceiver chip is electrically connected to the NFC antenna in sequence through the tenth capacitor, the first inductor, and the second inductor. The ANT2 terminal of the transceiver chip is electrically connected to the tenth capacitor and the first inductor in turn through the eleventh capacitor. The RFIN1 terminal of the transceiver chip is electrically connected to the twelfth capacitor and the thirteenth capacitor in turn. The RFIN2 terminal of the transceiver chip is electrically connected to the fifteenth capacitor and the sixteenth capacitor in turn. One end of the second inductor is grounded through the twelfth capacitor and the thirteenth capacitor, and the other end of the second inductor is electrically connected to the NFC antenna. The other end of the second inductor is also grounded through the fifteenth capacitor and the sixteenth capacitor in turn. One end of the fourteenth capacitor is grounded, and the other end of the fourteenth capacitor is electrically connected to the first inductor and the second inductor in turn.

3. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 2, characterized in that: The tenth capacitor is an adjustable capacitor.

4. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The transceiver chip's EN, DIN, DCLK, DOUT, and DOUT1 terminals are electrically connected to the MCU's signal input terminals, respectively.

5. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The transceiver chip has an external 5V DC power supply at its VDDA1 terminal and is grounded at its VSSA1 terminal. A first capacitor and a second capacitor are connected in parallel between the VDDA1 and VSSA1 terminals of the transceiver chip.

6. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The transceiver chip has an external 5V DC power supply at its VDDA2 terminal and is grounded at its VSSA2 terminal. A third capacitor and a fourth capacitor are connected in parallel between the VDDA2 terminal and the VSSA2 terminal of the transceiver chip.

7. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The transceiver chip's VDD terminal is connected to an external 5V DC power supply, its VSS terminal is grounded, and a seventh capacitor and an eighth capacitor are connected in parallel between the VDD and VSS terminals. The transceiver chip's AGD terminal is grounded through a ninth capacitor.

8. The low-power intelligent wireless linkage circuit based on NFC triggering according to claim 1, characterized in that: The OSCOUT terminal of the transceiver chip is electrically connected to the OSCIN terminal of the transceiver chip via a crystal oscillator. The OSCOUT terminal of the transceiver chip is grounded via a fifth capacitor, and the OSCIN terminal of the transceiver chip is grounded via a sixth capacitor.

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