CN216053075U - Circuit structure supporting active and passive NFC communication function - Google Patents

Abstract

The utility model relates to the technical field of NFC (near field communication), in particular to a circuit structure supporting an active and passive NFC function, which comprises: the NFC antenna comprises a main controller, an NFC chip, a radio frequency switch chip, an NFC read-write chip, a rectification module and an NFC antenna; the NFC chip, the NFC read-write chip and the radio frequency switch chip are all in communication connection with the main controller; the NFC chip, the NFC read-write chip and the rectification module are all in communication connection with the radio frequency switch chip; the NFC antenna is used for receiving and transmitting signals and is electrically connected with the radio frequency switch chip and the rectification module. When passive NFC communication needs to be supported, the product is placed on an NFC reader-writer, and an NFC chip acquires a radio frequency electromagnetic field signal sent by the NFC reader-writer and analyzes data; when active NFC communication needs to be supported, the main controller drives the NFC read-write chip to work, NFC signals are radiated out through the NFC antenna, the NFC antenna can also receive response data of an external NFC chip and return the response data to the NFC read-write chip, and active NFC communication is achieved.

Description

Circuit structure supporting active and passive NFC communication function

Technical Field

The utility model relates to the technical field of NFC (near field communication), in particular to a circuit structure supporting an active and passive NFC function.

Background

In recent years, mobile payment products have been in great demand, and many products based on mobile payment application scenes are derived in the market. As one of the main means of mobile payment transaction, NFC is used, and mobile payment terminals based on NFC transaction mode have great market demand. The current mobile payment terminal only supports an active NFC communication function or a passive NFC communication function, so that the use scene is relatively deficient; or use a fully functional NFC controller, but would result in a modest increase in product cost. Either way, it imposes some limitations on the product.

Disclosure of Invention

The utility model provides a circuit structure supporting an active and passive NFC communication function, and solves the technical problem that the current mobile payment terminal only supports the active NFC communication function or the passive NFC communication function and is single and deficient.

The present invention provides a circuit structure supporting active and passive NFC communication functions to solve the above technical problems, including: the NFC antenna comprises a main controller, an NFC chip, a radio frequency switch chip, an NFC read-write chip, a rectification module and an NFC antenna;

the NFC chip, the NFC read-write chip and the radio frequency switch chip are all in communication connection with the main controller;

the NFC chip, the NFC read-write chip and the rectification module are all in communication connection with the radio frequency switch chip;

and the NFC antenna is used for receiving and transmitting signals and is electrically connected with the radio frequency switch chip and the rectification module.

Preferably, the circuit structure further comprises a voltage transformation circuit, wherein the voltage transformation circuit comprises an H7533 chip for outputting 3.3V voltage to power the radio frequency switch chip.

Has the advantages that: the utility model provides a circuit structure supporting active and passive NFC communication functions, which comprises: the NFC antenna comprises a main controller, an NFC chip, a radio frequency switch chip, an NFC read-write chip, a rectification module and an NFC antenna; the NFC chip, the NFC read-write chip and the radio frequency switch chip are all in communication connection with the main controller; the NFC chip, the NFC read-write chip and the rectification module are all in communication connection with the radio frequency switch chip; the NFC antenna is used for receiving and transmitting signals and is electrically connected with the radio frequency switch chip and the rectification module; the output end of the rectification module is in communication connection with the NFC read-write chip. When passive NFC communication needs to be supported, the product is placed on an NFC reader-writer, and an NFC chip acquires a radio frequency electromagnetic field signal sent by the NFC reader-writer and analyzes data; when active NFC communication needs to be supported, the main controller drives the NFC read-write chip to work, NFC signals are radiated out through the NFC antenna, the NFC antenna can also receive response data of an external NFC chip and return the response data to the NFC read-write chip, and active NFC communication is achieved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:

fig. 1 is a functional block diagram of a circuit structure supporting an active and passive NFC communication function according to the present invention.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model. The utility model is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the present invention provides a circuit structure supporting active and passive NFC communication functions, including: the NFC antenna comprises a main controller, an NFC chip, a radio frequency switch chip, an NFC read-write chip, a rectification module and an NFC antenna; the NFC chip, the NFC read-write chip and the radio frequency switch chip are all in communication connection with the main controller; the NFC chip, the NFC read-write chip and the rectification module are all in communication connection with the radio frequency switch chip; the NFC antenna is used for receiving and transmitting signals and is electrically connected with the radio frequency switch chip and the rectification module; the output end of the rectification module is in communication connection with the NFC read-write chip. When passive NFC communication needs to be supported, the product is placed on an NFC reader-writer, and an NFC chip acquires a radio frequency electromagnetic field signal sent by the NFC reader-writer and analyzes data; when active NFC communication needs to be supported, the main controller drives the NFC read-write chip to work, NFC signals are radiated out through the NFC antenna, the NFC antenna can also receive response data of an external NFC chip and return the response data to the NFC read-write chip, and active NFC communication is achieved.

The main controller is used for realizing the control logic of the whole scheme and driving the NFC read-write chip. All the modules, the chips and the electric components are powered by an external power supply. The rectifier module drives the radio frequency switch chip only in a passive mode.

The NFC read-write chip carries out NFC communication in an active mode, and the NFC read-write chip is driven by the controller to realize an application process through the data interface and the main controller.

The NFC chip performs NFC communication in a passive manner.

The NFC antenna comprises a matching circuit used for realizing active and passive NFC communication functions, and the NFC antenna is shared by the NFC read-write chip and the NFC chip.

The radio frequency switch chip is used for realizing switching of the NFC antenna channel, the control pin of the radio frequency switch chip is connected with the main controller, and the NFC antenna channel can be switched between the NFC read-write chip and the NFC chip in a controlled manner; and under the default state, the radio frequency switch chip switches the NFC antenna channel to the NFC chip.

The rectification module is used for obtaining electric energy from the NFC antenna and supplying power to the radio frequency switch chip under the passive condition.

The following takes an actual usage scenario as an example:

when a product using the technical scheme needs to support passive NFC communication under the passive condition, the product is placed on an NFC reader-writer, an NFC antenna acquires a radio frequency electromagnetic field signal sent by the NFC reader-writer and transmits the radio frequency electromagnetic field signal to a rectification module, the rectification module rectifies the radio frequency electromagnetic field signal and outputs a direct current power supply to a radio frequency switch chip, and the radio frequency switch starts to work and is conducted. Because the radio frequency switch chip switches the NFC antenna channel to the NFC chip in the default state, the NFC chip can also acquire the radio frequency electromagnetic field signal sent by the NFC reader-writer and analyze data at the moment, and the response can also be returned to the NFC reader-writer through the NFC antenna, so that passive NFC communication is realized.

When the product needs to support passive NFC communication under the active condition, the radio frequency switch chip can be powered by an external power supply. And simultaneously, the main controller operates the radio frequency switch chip to control the pin so that the NFC antenna channel is switched to the NFC chip. The product is placed on the NFC reader-writer, the NFC chip acquires a radio frequency electromagnetic field signal sent by the NFC reader-writer and analyzes data, and a response can also be returned to the NFC reader-writer through the NFC antenna, so that passive NFC communication is realized.

Similarly, when the product needs to support active NFC communication under the active condition, the NFC antenna channel can be switched to the NFC read-write chip by operating the radio frequency switch chip control pin through the main controller; the main controller drives the NFC read-write chip to work, NFC signals are radiated out through the NFC antenna, the NFC antenna can also receive response data of an external NFC chip and return the response data to the NFC read-write chip, and active NFC communication is achieved.

Preferably, the circuit structure further comprises a voltage transformation circuit, wherein the voltage transformation circuit comprises an H7533 chip for outputting 3.3V voltage to supply power to the radio frequency switch chip. And more voltages with other values can be generated by the voltage transformation circuit to supply voltage for the whole circuit structure.

By the circuit structure, the active NFC antenna and the passive NFC antenna can share one NFC antenna, and particularly the passive NFC antenna under the passive condition can be supported. The passive and active NFC communication is integrated, so that the cost is low, the integration level is high, the limitation of the traditional single communication mode is broken, and the application scene is wide.

The foregoing is merely a preferred embodiment of the utility model and is not intended to limit the utility model in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the utility model as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (2)

1. A circuit structure for supporting active and passive NFC communication functions, comprising: the NFC antenna comprises a main controller, an NFC chip, a radio frequency switch chip, an NFC read-write chip, a rectification module and an NFC antenna;

the NFC chip, the NFC read-write chip and the radio frequency switch chip are all in communication connection with the main controller;

the NFC chip, the NFC read-write chip and the rectification module are all electrically connected with the radio frequency switch chip;

and the NFC antenna is used for receiving and transmitting signals and is electrically connected with the radio frequency switch chip and the rectification module.

2. The circuit structure supporting active and passive NFC communication functions according to claim 1, further comprising a transformer circuit including an H7533 chip for outputting a 3.3V voltage to power the rf switch chip.

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