Method for determining matching relationship, radio frequency tag assembly, master radio frequency tag and slave radio frequency tag

Abstract

The application discloses a method for determining a matching relationship, a response method, a radio frequency tag assembly, and a master radio frequency tag and a slave radio frequency tag. The method for determining the matching relationship comprises the following steps: a master radio frequency tag query command is sent to the master radio frequency tag, so that the master radio frequency tag to be queried generates an activation signal, and the activation signal can be detected by the slave radio frequency tag connected with the master radio frequency tag to be queried; a slave radio frequency tag response message sent by the slave radio frequency tag is received, the slave radio frequency tag response message comprises identification information of the slave radio frequency tag sending the slave radio frequency tag response message; and the matching relationship between the master radio frequency tag to be queried and the slave radio frequency tag sending the slave radio frequency tag response message is determined based on the received slave radio frequency tag response message. The application can conveniently obtain the corresponding relationship between matched articles.

Description

Technical Field

[0001] This application relates to the field of radio technology, and in particular to a method for determining a matching relationship, a response method, and an RFID tag assembly, a master RFID tag, and a slave RFID tag. Background Technology

[0002] Radio Frequency Identification (RFID) is a non-contact identification technology that uses radio frequency to communicate data in order to identify target objects and obtain relevant data.

[0003] A wireless system based on RFID technology typically includes a reader (or interrogator) and one or more electronic tags (or transponders). A reader is a device that can read information from electronic tags and can be designed to be handheld or fixed. An electronic tag consists of a coupling element and a chip; the chip stores the tag's identification information, allowing the tag to be attached to an object for identification.

[0004] Based on their energy supply method, electronic tags can be divided into passive electronic tags, active electronic tags, and semi-active electronic tags. Passive electronic tags receive radio frequency signals emitted by a reader and transmit the information stored in the chip using energy obtained from induced current. Active electronic tags actively transmit signals at a specific frequency.

[0005] RFID operating frequencies can be categorized into low frequency (LF), high frequency (HF), ultra-high frequency (UHF), and microwave (MW). The corresponding representative operating frequencies are: low frequency below 135kHz, high frequency 13.56MHz, ultra-high frequency 860MHz-960MHz, and microwave 2.4GHz or 5.8GHz.

[0006] The characteristics of RFID technology have led to its widespread application in asset management, with an increasing number of enterprises using RFID for asset inventory. This has resulted in greater demands for RFID technology, including the matching and management of items. Traditional RFID systems can identify individual items, but they cannot obtain information on the matching relationships of managed items, such as network cables, fiber optic cable connectors, memory slots, and special tool accessories, making it impossible to determine the correspondence between terminals and connecting wires. Summary of the Invention

[0007] One object of this application is to provide a method, response method, RFID tag component, and master and slave RFID tags for determining matching relationships, in order to solve the problem of identifying matching relationships of items.

[0008] One aspect of this disclosure provides a method for determining a matching relationship for a reader, the method comprising: sending a master RFID query command to a master RFID tag, the master RFID query command including identification information of the master RFID tag to be queried, such that the master RFID tag to be queried generates an activation signal, the activation signal being detectable by a slave RFID tag connected to the master RFID tag to be queried; receiving a slave RFID tag response message sent by the slave RFID tag, the slave RFID tag response message including identification information of the slave RFID tag that sent the slave RFID tag response message; and determining a matching relationship between the master RFID tag to be queried and the slave RFID tag that sent the slave RFID tag response message based on the identification information in the received slave RFID tag response message.

[0009] In some embodiments, the primary RFID tag query command includes a primary RFID tag filtering instruction and a primary RFID tag activation signal generation instruction. The primary RFID tag filtering instruction includes the identification information of the primary RFID tag to be queried to filter out the primary RFID tag to be queried. The primary RFID tag activation signal generation instruction instructs the primary RFID tag to be queried to generate an activation signal.

[0010] In some embodiments, after detecting the activation signal, the slave RFID tag connected to the master RFID tag to be queried writes an activation flag at a preset address in the data storage area. Before receiving a slave RFID tag response message sent by the slave RFID tag, the method further includes: sending a slave RFID tag query command to the slave RFID tag. The slave RFID tag query command includes a specified address in the data storage area and feature data. The slave RFID tag query command is used to notify the slave RFID tag that stores the feature data at the specified address in the data storage area to send the slave RFID tag response message.

[0011] In some embodiments, the RFID query command includes a RFID filtering instruction and an RFID inventory instruction sent sequentially. The RFID filtering instruction includes a specified address of the data storage area and the feature data. The RFID filtering instruction is used to filter out RFID tags that store the feature data at the specified address in the data storage area. The RFID inventory instruction is used to cause the filtered RFID tags to send the RFID response message.

[0012] In some embodiments, the method further includes: transmitting an RF carrier before sending the master RFID query command and maintaining it for a first time interval; stopping the transmission of the RF carrier during a second time interval; and transmitting the RF carrier at the end of the second time interval and maintaining it until the slave RFID response message is received.

[0013] In some embodiments, the method further includes: sending an RF carrier before sending the master RFID query command and maintaining it until after receiving the slave RFID response message; and sending a slave RFID start detection command before receiving the slave RFID response message sent by the slave RFID.

[0014] A second aspect of this application provides a response method for a master RFID tag, the method comprising: receiving a master RFID tag query command, the master RFID tag query command including identification information of the master RFID tag to be queried; determining, based on the identification information in the master RFID tag query command, whether the master RFID tag query command is sent to itself; and, in response to the master RFID tag query command being sent to itself, generating an activation signal, the activation signal being received by a slave RFID tag connected to itself, and the slave RFID tag sending a slave RFID tag response message after receiving the activation signal, the slave RFID tag response message including the identification information of the slave RFID tag.

[0015] In some embodiments, the primary RFID tag query command includes a primary RFID tag filtering instruction and a primary RFID tag activation signal generation instruction. The primary RFID tag filtering instruction includes the identification information of the primary RFID tag to be queried to filter out the primary RFID tag to be queried. The primary RFID tag activation signal generation instruction instructs the primary RFID tag to be queried to generate the activation signal.

[0016] A third aspect of this application provides a response method for a radio frequency tag, the method comprising: initiating activation signal detection at an activation signal detection time; and, in response to detecting the activation signal, sending a response message from the radio frequency tag, the response message from the radio frequency tag including identification information of the radio frequency tag.

[0017] In some embodiments, the activation signal detection time is the power-on time from the RFID tag.

[0018] In some embodiments, the activation signal detection time is the time when the RFID tag receives the RFID tag activation detection command sent to itself plus a preset time interval.

[0019] In some embodiments, sending a response message from an RFID tag in response to detecting an activation signal includes: writing an activation flag to a preset address in a data storage area in response to detecting an activation signal; receiving a query command from an RFID tag, the query command including a specified address in the data storage area and feature data; reading data from the specified address in the data storage area and comparing whether the read data is the same as the feature data; and sending the response message from the RFID tag in response to the read data being the same as the feature data.

[0020] In some embodiments, the RFID query command includes a RFID filtering instruction and an RFID inventory instruction sent sequentially. The RFID filtering instruction includes a specified address of the data storage area and the feature data. The RFID filtering instruction is used to filter out RFID tags that store the feature data at the specified address in the data storage area. The RFID inventory instruction is used to cause the filtered RFID tags to send the RFID response message.

[0021] A fourth aspect of this application provides an RFID tag assembly comprising: a master RFID tag configured to generate an activation signal in response to receiving a master RFID tag query command sent to the master RFID tag; and a slave RFID tag configured to send a slave RFID tag response message in response to detecting the activation signal, the slave RFID tag response message including identification information of the slave RFID tag; wherein the master RFID tag is connectable to the slave RFID tag so that the slave RFID tag can detect the activation signal generated by the master RFID tag.

[0022] In some embodiments, the master RFID tag includes a first RFID chip, a first connector, and a first antenna. The first RFID chip has an antenna port and a voltage output port. The first antenna is coupled to the antenna port of the first RFID chip. The first RFID chip is configured to output a drive voltage at its voltage output port to generate an activation signal in response to receiving a master RFID query command sent to the master RFID tag from its antenna port. The slave RFID tag includes a second RFID chip, a second connector, and a second antenna. The second RFID chip has an antenna port and a status detection port. The second antenna is coupled to the antenna port of the second RFID chip. The second RFID chip is configured to send a slave RFID response message through the second antenna in response to detecting the activation signal from its status detection port. The slave RFID response message includes the identification information of the slave RFID tag. The first connector can be connected to the second connector, and after the first connector is connected to the second connector, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip.

[0023] In some embodiments, after the first connection port is connected to the second connection port, the first antenna is further coupled to the second antenna.

[0024] In some embodiments, the main RFID tag further includes an energy storage device coupled to the voltage output port of the first RFID tag chip. The energy storage device can store the electrical energy output from the voltage output port of the first RFID tag chip to generate the activation signal.

[0025] In some embodiments, the energy storage device is a capacitor.

[0026] In some embodiments, the first antenna includes a first branch and a second branch, wherein the first branch and the second branch of the first antenna are respectively coupled to two terminals of the antenna port of the first RFID chip.

[0027] In some embodiments, the second antenna includes a first branch and a second branch, wherein the first branch and the second branch of the second antenna are respectively coupled to two terminals of the antenna port of the second RFID chip.

[0028] In some embodiments, after the first connection port is connected to the second connection port, the first branch or the second branch of the first antenna is coupled to the first branch or the second branch of the second antenna.

[0029] In some embodiments, the second RFID chip determines that it has detected the activation signal in response to detecting a high level at its status detection port.

[0030] In some embodiments, the RFID tag further includes a switch module having a voltage input port and a connection port. The connection port of the switch module is coupled to the status detection port of the second RFID tag chip. When the first connection port is connected to the second connection port, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module. The switch module is configured to control the first and second terminals of its connection port to conduct in response to the voltage of its voltage input port being higher than the conduction voltage. The second RFID tag chip determines that the activation signal has been detected in response to detecting that the first and second terminals of its status detection port are conducting.

[0031] In some embodiments, the switching module is a field-effect transistor, the gate and source of the field-effect transistor constitute the voltage input port of the switching module, and the drain and source of the field-effect transistor constitute the connection port of the switching module.

[0032] A fifth aspect of this application provides a master RFID tag that can be used in conjunction with a slave RFID tag to determine an item matching relationship, wherein the master RFID tag is configured to generate an activation signal in response to receiving a master RFID tag query command sent to the master RFID tag, and the slave RFID tag is configured to send a slave RFID tag response message in response to detecting the activation signal, the slave RFID tag response message including the identification information of the slave RFID tag.

[0033] In some embodiments, the master RFID tag includes: a first RFID chip having an antenna port and a voltage output port, the first RFID chip outputting a drive voltage at its voltage output port to generate an activation signal in response to receiving a master RFID query command sent to the master RFID tag from its antenna port; a first connection port; and a first antenna coupled to the antenna port of the first RFID chip. The slave RFID tag includes a second RFID chip, a second connection port, and a second antenna. The second RFID chip has an antenna port and a status detection port. The second antenna is coupled to the antenna port of the second RFID chip. The second RFID chip is configured to send a slave RFID response message through the second antenna in response to detecting the activation signal from its status detection port. The slave RFID response message includes identification information of the slave RFID tag. The first connection port is connectable to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip.

[0034] In some embodiments, the main RFID tag further includes an energy storage device coupled to the voltage output port of the first RFID tag chip. The energy storage device can store the electrical energy output from the voltage output port of the first RFID tag chip to generate the activation signal.

[0035] In some embodiments, the energy storage device is a capacitor.

[0036] A sixth aspect of this application provides a secondary RFID tag that can be used in conjunction with a primary RFID tag to determine an item matching relationship. The secondary RFID tag is configured to send a primary RFID tag response message in response to detecting an activation signal. The primary RFID tag response message includes identification information of the primary RFID tag. The primary RFID tag is configured to generate the activation signal in response to receiving a primary RFID tag query command sent to the primary RFID tag.

[0037] In some embodiments, the slave RFID tag includes: a second RFID chip having an antenna port and a status detection port; a second connection port; and a second antenna coupled to the antenna port of the second RFID chip. The second RFID chip, in response to detecting the activation signal from its status detection port, sends the slave RFID tag response message through the second antenna. The master RFID tag includes a first RFID chip, a first connection port, and a first antenna. The first RFID chip has an antenna port and a voltage output port. The first antenna is coupled to the antenna port of the first RFID chip. In response to receiving a master RFID tag query command sent to the master RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port to generate an activation signal at the voltage output port. The first connection port is connectable to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip.

[0038] In some embodiments, the second RFID chip is configured to determine that the activation signal has been detected in response to a high level detected at its status detection port.

[0039] In some embodiments, the RFID tag further includes a switch module having a voltage input port and a connection port. The connection port of the switch module is coupled to the status detection port of the second RFID tag chip. When the first connection port is connected to the second connection port, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module. In response to the voltage of its voltage input port being higher than the conduction voltage, the switch module conducts the first and second terminals of its connection port. The second RFID tag chip is configured to determine that the activation signal has been detected in response to detecting that the first and second terminals of its status detection port are conducting.

[0040] In some embodiments, the switching module is a field-effect transistor, the gate and source of the field-effect transistor constitute the voltage input port of the switching module, and the drain and source of the field-effect transistor constitute the connection port of the switching module.

[0041] The method for determining matching relationships in this application can conveniently obtain the correspondence between matching items.

[0042] The above is an overview of this application, and there may be simplifications, generalizations, and omissions of details. Therefore, those skilled in the art should recognize that this section is merely illustrative and not intended to limit the scope of this application in any way. This overview section is neither intended to identify the key or essential features of the claimed subject matter nor to serve as an aid in determining the scope of the claimed subject matter. Attached Figure Description

[0043] The above and other features of this application will become more fully clear through the following description and appended claims, in conjunction with the accompanying drawings. It is understood that these drawings depict only a few embodiments of the application and should not be construed as limiting the scope of the application. The application will be described more clearly and in more detail through the use of the drawings.

[0044] Figure 1 A schematic diagram of a wireless system based on RFID technology according to an embodiment of the present disclosure is shown;

[0045] Figure 2 A method 100 for determining matching relationships according to an embodiment of the present disclosure is shown;

[0046] Figure 3 A signaling flowchart of a reader 10 with a master RFID tag 21 and a slave RFID tag 25 according to an embodiment of the present disclosure is shown;

[0047] Figure 4Another signaling flowchart of the reader 10 with the master RFID tag 21 and the slave RFID tag 25 according to an embodiment of the present disclosure is shown;

[0048] Figure 5 It shows Figure 1 The diagram shown is a structural block diagram of an RFID tag assembly 20 according to an embodiment.

[0049] Figure 6 It shows Figure 1 The diagram shows a structural block diagram of an embodiment of the radio frequency tag assembly 20 from the radio frequency tag 25. Detailed Implementation

[0050] The technical solution of this application will now be described in detail with reference to the accompanying drawings. In the drawings, similar symbols generally denote similar components unless the context otherwise requires. The specific embodiments described in the following detailed description, drawings, and claims are not intended to limit the scope of protection of this application. Other embodiments may be adopted, and modifications, combinations, equivalent substitutions, or other changes may be made without departing from the spirit or scope of the subject matter of this application, all of which explicitly constitute part of the content of this application and are included within the scope of protection of this application.

[0051] In practical applications, it is sometimes necessary to manage a large number of item matching relationships. An item matching relationship refers to the correspondence between one item 'a' and another item 'b'. This correspondence can be the connection relationship between items 'a' and 'b', for example, in applications with a large number of cable connections, items 'a' and 'b' are the connection ends of each pair of interconnected cables. Although the matching relationship between each item 'a' and its corresponding item 'b' is fixed after each item 'a' is connected, this matching relationship can be randomly established. Therefore, when a large number of item matching relationships need to be determined, especially when the items are small in size, obtaining such matching relationships becomes particularly difficult.

[0052] To facilitate understanding, the problem of determining the matching relationship of items can be described using the following mathematical model. Consider a scenario with N items of type A and N items of type B, where each item of type A is matched with one item of type B, meaning there is a one-to-one correspondence between items of type A and items of type B. Let's denote the i-th item in type A as a... i The j-th item in category B is represented as b. j Where 1≤i≤N, 1≤j≤N. For each item a i The item it matches is represented as b. P(i)Where P(1), P(2), ..., P(N) are the sequences obtained by rearranging the order of sequence 1, 2, ..., N. P(·) can be understood as a permutation function. How to obtain this permutation function, that is, for each item a... i How can I easily obtain the matching item b? P(i) Or for each item b j How to easily obtain matching items? It is a difficult problem. Among them, P -1 (·) represents the inverse function of P(·).

[0053] To address the aforementioned problems, this application discloses an RFID tag assembly, comprising a master RFID tag and a slave RFID tag. The RFID tag assembly of this disclosure employs dual RFID tag technology, with the master RFID tag and the slave RFID tag respectively attached to one of two matched items, a and b, to identify items a and b. The master RFID tag and the slave RFID tag are connected, and the slave RFID tag is activated by the master RFID tag. The activated slave RFID tag is then identified, thereby obtaining the slave RFID tag corresponding to the master RFID tag, thus determining the correspondence between the items identified by the master RFID tag and the items identified by the slave RFID tag. Furthermore, this disclosure further achieves a better operating distance by allowing the master RFID tag and the slave RFID tag to utilize each other's antennas to obtain extended antennas.

[0054] Figure 1 A schematic diagram of a wireless system based on RFID technology according to an embodiment of the present disclosure is shown.

[0055] See Figure 1 The wireless system in this embodiment includes a reader 10 and multiple radio frequency tag components 20 for determining item matching relationships.

[0056] Each RFID tag assembly 20 includes a master RFID tag 21 and a slave RFID tag 25, which have a connection port for interconnection. Both the master RFID tag 21 and the slave RFID tag 25 are independently operable RFID tags and each has an RFID tag chip. That is, even when not connected, both the master RFID tag 21 and the slave RFID tag 25 can respond to commands transmitted by the reader 10 and perform corresponding operations according to the commands. The specific operations can vary depending on the command executed; for example, they can send a corresponding response signal to the reader 10, detect signals at the input port of the RFID tag chip, read data from the storage area of ​​the RFID tag chip, write data to the storage area of ​​the RFID tag chip, etc. However, when operating independently, the working distance between the master RFID tag 21 and the slave RFID tag 25 is relatively small due to antenna size limitations. Here, the working distance refers to the distance at which the reader and the RFID tag can communicate with each other. However, according to some embodiments of this disclosure, when the master RFID tag 21 and the slave RFID tag 25 are connected together, either RFID tag can utilize the antenna of the other RFID tag to obtain a larger extended antenna, thereby greatly increasing the working distance of the master RFID tag 21 and the slave RFID tag 25.

[0057] Reader 10 can transmit a radio frequency carrier at a specific frequency. When RFID tags, such as primary RFID tag 21 and secondary RFID tag 25, enter the electromagnetic field range of the radio frequency carrier transmitted by reader 10, they are activated by receiving energy provided by reader 10. Alternatively, reader 10 can transmit by modulating a signal onto the radio frequency carrier. The RFID tag absorbs energy from the received radio frequency signal through its antenna to drive the tag circuitry, demodulates the valid information contained in the radio frequency carrier, and transmits the signal by controlling the reflectivity of the received radio frequency carrier.

[0058] When the RFID tag assembly 20 is used to determine item matching relationships, the master RFID tag 21 and slave RFID tag 25 of each RFID tag assembly 20 are respectively attached to one of two matching items a and b, and the master RFID tag 21 and slave RFID tag 25 are connected together via a connector. For example, the master RFID tag 21 is attached to an item a, and the slave RFID tag 25 is attached to an item b that matches item a. Thus, each master RFID tag 21 is associated with an item a, and each slave RFID tag 25 is associated with an item b.

[0059] Figure 2 The present disclosure illustrates a method 100 for determining a matching relationship, which can be achieved through... Figure 1 The wireless system shown is implemented through the interaction of the reader 10 and the primary and secondary RFID tags of the RFID tag assembly 20. The following section combines... Figure 2 The working principle of the RFID tag assembly 20 and reader 10 of this disclosure in cooperation to determine the item b that matches a certain item a to be matched is described.

[0060] To determine which item b matches the item to be matched (item a), reader 10 sends a master RFID tag query command (step S110). The master RFID tag query command includes the identification information of the master RFID tag 21 associated with the item to be matched (i.e., the master RFID tag to be queried). The identification information is any information that can uniquely identify the RFID tag, for example, it can be the RFID tag's identifier (ID).

[0061] Upon receiving the main RFID tag query command, the main RFID tag 21 determines whether the main RFID tag query command was sent to itself based on the identification information (step S120). If the identification information contained in the main RFID tag query command is the same as its own identification information, it confirms that the main RFID tag query command was sent to itself and generates an activation signal (step S130).

[0062] The RFID tag 25 initiates activation signal detection at the activation signal detection time (step S140) and determines whether an activation signal is detected (step S150). After detecting the activation signal, it sends a slave RFID tag response message (step S160), which includes the identification information of the slave RFID tag. Only the slave RFID tag 25 connected to the master RFID tag 21 that generated the activation signal can detect the activation signal generated by the master RFID tag 21. The activation signal detection time can be configured as needed. In some embodiments, the activation signal detection time is the power-on time of the slave RFID tag 25, that is, the time corresponding to the transition from the state of the slave RFID tag 25 without receiving the RF carrier to the state of receiving the RF carrier. At this time, the slave RFID tag 25 is driven by the RF carrier to start working. In some embodiments, the slave RFID tag 25 does not initiate activation signal detection at the power-on time, but only after receiving the slave RFID tag activation detection command issued by the reader 10. In this case, the activation signal detection time is a certain time after the slave RFID tag 25 receives the slave RFID tag activation detection command issued by the reader 10.

[0063] After receiving the RFID tag response message from the RFID tag 25, the reader 10 can determine the matching relationship between the master RFID tag 21 associated with the item to be matched and the RFID tag 25 based on the identification information contained in the RFID tag response message, thereby determining the item b associated with the RFID tag 25, and further determining the item b that matches the item to be matched a.

[0064] When there are many items to be matched, for example, in a scenario where there are N items of type A and N items of type B to match, the reader 10 can sequentially match one item 'a' from type A. i As the item to be matched, determine the match with item a according to the steps of method 100. i Matching item b P(i) This continues until a matching item of type B is obtained for each of the N type A items.

[0065] Figure 3 A signaling flowchart of a reader 10 with a master RFID tag 21 and a slave RFID tag 25, according to an embodiment of the present disclosure, is shown, which can be used to implement method 100.

[0066] In this embodiment, when item matching is initiated, the main RFID query command sent by the reader 10 to the main RFID tag 21 includes a main RFID filtering instruction and a main RFID activation signal generation instruction sent sequentially. All main RFID tags 21 located within the radio frequency carrier range emitted by the reader 10 can receive the main RFID query command emitted by the reader 10.

[0067] The main RFID tag filtering instruction is used to filter out the main RFID tags to be queried. That is, only the main RFID tag 21 to be queried can perform the corresponding operation according to the instruction of the reader 10, and other main RFID tags 21 that are not filtered out will not perform the corresponding operation.

[0068] The main RFID tag generates an activation signal instruction to instruct the queried main RFID tag 21 to generate an activation signal. This instruction is sent after the main RFID tag filtering instruction; therefore, only the filtered-out queried main RFID tag 21 generates an activation signal. The activation signal generated by the queried main RFID tag 21 must last for a certain period, during which activation signal detection is performed by the RFID tag 25.

[0069] In some embodiments, the main RFID query command sent by the reader 10 to the main RFID tag 21 further includes a main RFID tag inventory instruction. The main RFID tag inventory instruction is used to cause the filtered main RFID tag 21 to send a main RFID tag response message, which includes the identification information of the main RFID tag 21. After receiving the main RFID tag response message, the reader 10 confirms the filtered main RFID tag 21 based on the identification information.

[0070] The RFID tag 25 initiates activation signal detection at the activation signal detection time. If an activation signal is detected, it sends a RFID tag response message including its identification information.

[0071] Reader 10 needs to transmit an RF carrier, which is modulated to send instructions to the master RFID tag 21. The master RFID tag 21 and the slave RFID tag 25 obtain power from the RF carrier transmitted by reader 10, and send messages to reader 10 by controlling the reflectivity of the received RF carrier. Therefore, the RF carrier transmitted by reader 10 is used on the one hand to provide power to the master RFID tag 21 and the slave RFID tag 25 to drive the tag circuit, and on the other hand to carry signaling or messages between reader 10 and master RFID tag 21 or slave RFID tag 25.

[0072] like Figure 3 As shown, reader 10 needs to send an RF carrier before sending the master RFID query command and maintain it for a first time interval T1 to power the tag circuit of master RFID tag 21. During the first time interval T1, reader 10 sends the master RFID query command to master RFID tag 21 to generate an activation signal. After the first time interval T1 ends, during the second time interval T2, reader 10 stops sending the RF carrier and no longer powers the tag circuit of master RFID tag 21. At the end of the second time interval T2, reader 10 sends the carrier again and maintains it for a third time interval T3 to power the tag circuit of slave RFID tag 25. Slave RFID tag 25 powers on at the end of the second time interval T2 and initiates activation signal detection; the end of the second time interval T2 is the activation signal detection time. After detecting the activation signal, it sends a slave RFID tag response message.

[0073] It should be noted that in this embodiment, since the reader 10 stops transmitting the radio frequency carrier during the second time interval T2, it cannot supply power to the main radio frequency tag 21. The activation signal generated by the main radio frequency tag 21 needs to continue until the activation signal detection time before it can be detected by the radio frequency tag 25. Therefore, the main radio frequency tag 21 needs to have an energy storage device to store the power provided by the reader 10 during the first time interval T1 so that the activation signal can continue until the activation signal detection time. Therefore, the duration Ta of the activation signal generated by the main radio frequency tag 21 includes the second time interval T2.

[0074] Understandably, this method allows the RFID tag 25 to detect activation signals upon power-up, eliminating the need for the reader 10 to send a specific instruction to the RFID tag 25 to perform activation signal detection. This enables item matching in a shorter time. For situations requiring matching of a large number of items, this significantly reduces matching time. Furthermore, this method allows the master RFID tag 21 and slave RFID tag 25 to use different operating frequencies, providing a degree of flexibility.

[0075] In some embodiments, the RFID tag 25 may actively send an RFID tag response message after detecting an activation signal.

[0076] In some embodiments, after detecting an activation signal from the RFID tag 25, an activation flag is written to a preset address in its data storage area. Upon receiving a query command from the RFID tag, the RFID tag determines whether to send a response message based on the query command. Specifically, the query command includes a specified address of the data storage area and feature data. After receiving the query command, the RFID tag 25 reads data from the data storage area based on the specified address in the query command, compares the read data with the feature data in the query command, and if they are the same, sends a response message. It can be understood that the activation flag written to the preset address of the data storage area after the RFID tag 25 detects an activation signal can be preset specific data, which must be the same as the feature data in the query command.

[0077] In some embodiments, the RFID tag query command includes a sequentially sent RFID tag filtering instruction and an RFID tag inventory instruction. The RFID tag filtering instruction includes a specified address of the data storage area and feature data, used to filter out RFID tags that have feature data stored at the specified address in the data storage area. The RFID tag inventory instruction causes the filtered RFID tags to send RFID tag response messages, while the unfiltered RFID tags do not send messages, thereby allowing the reader 10 to receive the RFID tag response messages sent by the filtered RFID tags 25 without interference.

[0078] Figure 4 Another signaling flowchart of the reader 10 with the master RFID tag 21 and slave RFID tag 25, according to an embodiment of the present disclosure, is shown, which can be used to implement method 100.

[0079] This embodiment and Figure 3 The main difference in the illustrated embodiment is that, in this embodiment, during the period T4 from sending the master RFID query command to receiving the slave RFID response message, the reader 10 continuously transmits a carrier wave; additionally, the reader 10 needs to send a slave RFID activation detection command to the slave RFID 25 to instruct the slave RFID 25 to perform activation signal detection. The timing of the slave RFID 25 performing activation signal detection can be after a preset time interval ΔT following the receipt of the slave RFID activation detection command.

[0080] In this manner, since the reader 10 can continuously supply power to the main RFID tag 21, the main RFID tag 21 does not need to use an additional energy storage device to generate the activation signal, reducing implementation costs. In this way, without using an additional energy storage device, the main RFID tag 21 and the slave RFID tag 25 should use the same operating frequency. Of course, alternatively, the main RFID tag 21 can use an additional energy storage device to improve the driving capability of its activation signal.

[0081] Figure 5 It shows Figure 1 The diagram shows a structural block diagram of an RFID tag assembly 20 according to an embodiment.

[0082] The main RFID tag 21 includes a first RFID tag chip 210, a first connection port 220, and a first antenna 230. The first RFID tag chip 210 has an antenna port 211 and a voltage output port 212, and the first antenna 230 is coupled to the antenna port 211 of the first RFID tag chip 210.

[0083] The first RFID chip 210 is a passive tag, and it stores the identification information of the main RFID tag 21. When the first antenna 230 receives the RFID carrier emitted by the reader 10, the antenna port 211 can generate an induced voltage, driving the first RFID chip 210 to work.

[0084] In response to receiving a master RFID query command sent to master RFID 21 from its antenna port 211, the first RFID chip 210 outputs a drive voltage at its voltage output port 212. This drive voltage is used to generate an activation signal at the voltage output port 212. The activation signal is used to activate the slave RFID tag 25 connected to the master RFID tag 21, thereby enabling the reader 10 to identify the activated RFID tag 25.

[0085] The antenna port 211 of the first RFID chip 210 includes two terminals 211a and 211b, and the voltage output port 212 includes two terminals 212a and 212b.

[0086] The first antenna 230 is an RFID antenna. The shape and installation method of the first antenna 230 can be determined according to factors such as the area, shape, and operating frequency of the main RFID tag 21. The first antenna 230 includes a first branch 230a and a second branch 230b. The first branch 230a and the second branch 230b are respectively coupled to two terminals of the antenna port 211 of the first RFID tag chip 210. For example, the first branch 230a is coupled to terminal 211a, and the second branch 230b is coupled to terminal 211b.

[0087] Depending on the operating frequency, in some embodiments, the first branch 230a and the second branch 230b are interconnected or form a single structure; in other embodiments, the first branch 230a and the second branch 230b are separate structures. The number of first branches 230a can be one or more. When there are more than one, these first branches 230a are coupled together, meaning that the radio frequency signal sensed by each first branch can be coupled to one or more other first branches. Similarly, the number of second branches 230b can also be one or more. When there are more than one, these second branches 230b are also coupled together.

[0088] The first connection port 220 is used to connect the terminals of the main RFID tag 21 to the corresponding terminals of the slave RFID tag 25.

[0089] In some embodiments, the main RFID tag 21 further includes an energy storage device 240, which is coupled to the voltage output port 212 of the first RFID chip 210. The energy storage device 240 can store the electrical energy output from the voltage output port 212 of the first RFID chip 210, thereby enabling the voltage output port 212 to generate a voltage signal with a certain driving current as an activation signal. In some preferred embodiments, the energy storage device 240 is a capacitor.

[0090] In this embodiment, the energy storage device 240 functions as both energy storage and delay. First, by charging the energy storage device 240 for a certain period, the electrical energy output by the first RFID chip 210 can be stored, giving the activation signal a strong current-driven capability. This allows the first RFID chip 210 to charge the energy storage device 240 with a very small current through its voltage output port 212, effectively enhancing the working distance of the main RFID tag 21. Second, the energy storage device 240 can provide delayed power supply, ensuring that the voltage output port 212 can still generate an activation signal even when the first RFID chip 210 is not outputting electrical energy.

[0091] The RFID tag 25 includes a second RFID chip 250, a second antenna 260, and a second connection port 280. The second RFID chip 250 has an antenna port 252 and a status detection port 251, and the second antenna 260 is coupled to the antenna port of the second RFID chip 252. The second antenna 260 includes a first branch 260a and a second branch 260b.

[0092] The second RFID chip 250 is a passive tag. The second RFID chip 250 is configured to generate a slave RFID tag response message in response to an activation signal detected from its status detection port 251, and transmit it through the second antenna 260 or an extended antenna consisting of the coupling of the second antenna 260 and the first antenna 230. The slave RFID tag response message includes identification information of the slave RFID tag 25. After receiving the slave RFID tag response message transmitted by the second RFID chip 250, the reader 10 can determine which slave RFID tag 25 sent the message based on the identification information carried in the message.

[0093] In this embodiment, the second RFID chip 250 is configured to determine that an activation signal has been detected in response to a high level detected at its status detection port 251. Here, a high level means that the voltage across the status detection port 251 is higher than a preset voltage threshold.

[0094] The antenna port 252 of the second RFID chip 250 includes two terminals 252a and 252b, and the status detection port 251 includes two terminals 251a and 251b.

[0095] The second antenna 260 is an RFID antenna. Similar to the first antenna 230, the shape and installation method of the second antenna 260 can be determined based on factors such as the area, shape, and operating frequency of the RFID tag 25. The second antenna 260 includes a first branch 260a and a second branch 260b. The first branch 260a and the second branch 260b are respectively coupled to two terminals of the antenna port 252 of the second RFID tag chip 250. For example, the first branch 260a is coupled to terminal 252a, and the second branch 260b is coupled to terminal 252b.

[0096] In some embodiments, the first branch 260a and the second branch 260b of the second antenna 260 are interconnected or are an integral structure; in some embodiments, the first branch 260a and the second branch 260b of the second antenna 260 are separate structures. The number of first branches 260a can be one or more, and when there are more than one, these first branches 260a are coupled together. The number of second branches 260b can also be one or more, and when there are more than one, these second branches 260b are also coupled together.

[0097] The second connection port 280 is used to connect to the first connection port 220 of the main RFID tag 21, so as to connect the terminals of the main RFID tag 21 to the corresponding terminals of the slave RFID tag 25. After the first connection port 220 and the second connection port 280 are connected, the voltage output port 212 of the first RFID chip 210 of the main RFID tag 21 is coupled to the status detection port 251 of the second RFID chip 250 of the slave RFID tag 25. Figure 5 As shown, the voltage output port 212 of the first RFID chip 210 corresponds to the port composed of the VDD terminal and the GND terminal of the first connection port 220, and the status detection port 251 of the second RFID chip 250 corresponds to the port composed of the DET terminal and the GND terminal of the second connection port 280.

[0098] In some embodiments, after the first connection port 220 is connected to the second connection port 280, the first antenna 230 of the main RFID tag 21 is further coupled to the second antenna 260 of the slave RFID tag 25. For example, a first branch or a second branch of the first antenna 230 can be coupled to a first branch or a second branch of the second antenna 260. In this case, both the main RFID tag 21 and the slave RFID tag 25 can utilize the antenna of the other RFID tag to obtain a larger extended antenna, thereby significantly increasing the operating distance of the main RFID tag 21 and the slave RFID tag 25. Figure 5 As shown, one or more branches of the first antenna 230 of the main RFID tag 21 correspond to the terminals ANT1, ANT2, ..., ANTn of the first connection port 220, and one or more branches of the second antenna 260 of the RFID tag 25 correspond to the terminals ANT1, ANT2, ..., ANTn of the second connection port 280, where n is the number of terminals to which the first antenna 230 and the second antenna 260 are interconnected.

[0099] Figure 6 It shows Figure 1 The diagram shows a structural block diagram of an embodiment of the radio frequency tag assembly 20 from the radio frequency tag 25.

[0100] Figure 6 The RFID tag 25 shown is... Figure 5 The structure of the RFID tag 25 shown is slightly different, the main difference being that... Figure 6 In the embodiment shown, the RFID tag 25 also includes a switch module 270.

[0101] The switch module 270 has a voltage input port 271 and a connection port 272. The connection port 272 of the switch module 270 is coupled to the status detection port 251 of the second RFID chip 250. When the first connection port 220 of the main RFID tag 21 is connected to the second connection port 280 of the slave RFID tag 25, the voltage output port 212 of the first RFID chip 210 is coupled to the voltage input port 271 of the switch module 270.

[0102] The switch module 270 is configured to control the first terminal 272a and the second terminal 272b of its connection port 272 to conduct in response to a voltage at its voltage input port 271 exceeding the conduction voltage. Correspondingly, the second RFID chip 250 is configured to determine that an activation signal has been detected in response to detecting the conduction of the first terminal 251a and the second terminal 251b of its status detection port 251. It should be noted that the second RFID chip 250 detecting the conduction of the first terminal 251a and the second terminal 251b can be due to the second RFID chip 250 detecting that the resistance value between the first terminal 251a and the second terminal 251b is less than a preset resistance value.

[0103] In some embodiments, the switching module 270 is a field-effect transistor (FET), the gate and source of the FET forming the voltage input port 271 of the switching module 270, and the drain and source forming the connection port 272 of the switching module 270.

[0104] Those skilled in the art can understand and implement other modifications to the disclosed embodiments by reading the specification, the disclosure, the drawings, and the appended claims. Such modifications, without departing from the essence of the claims, fall within the scope of protection of the claims. In the claims, the word "comprising" does not exclude other elements and steps, and the words "a" or "an" do not exclude a plurality. In practical applications of this application, a single part or module may perform the functions of multiple technical features referenced in the claims. Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. A method for determining matching relationships, for a reader, characterized in that, The method includes: Send a master RFID query command to the master RFID tag. The master RFID query command includes a master RFID filtering instruction and a master RFID activation signal generation instruction sent sequentially. The master RFID filtering instruction includes the identification information of the master RFID tag to be queried. The master RFID activation signal generation instruction instructs the master RFID tag to be queried to generate an activation signal. The activation signal can be detected by the slave RFID tag connected to the master RFID tag to be queried. Receive a RFID tag response message sent from an RFID tag, the RFID tag response message including identification information of the RFID tag that sent the RFID tag response message; and Based on the identification information in the received RFID tag response message, the matching relationship between the master RFID tag to be queried and the slave RFID tag that sent the slave RFID tag response message is determined.

2. The method according to claim 1, characterized in that, After detecting the activation signal, the slave RFID tag connected to the master RFID tag to be queried writes an activation flag at a preset address in the data storage area.

3. The method according to claim 1, characterized in that, Before receiving the RFID tag response message sent from the RFID tag, the method further includes: Send a RFID query command to a slave RFID tag. The RFID query command includes a specified address of the data storage area and feature data. The RFID query command is used to notify the slave RFID tag that stores the feature data at the specified address in the data storage area to send the RFID response message.

4. The method according to claim 3, characterized in that, The RFID tag query command includes a RFID tag filtering instruction and an RFID tag inventory instruction sent sequentially. The RFID tag filtering instruction includes a specified address of the data storage area and the feature data. The RFID tag filtering instruction is used to filter out RFID tags that store the feature data at the specified address in the data storage area. The RFID tag inventory instruction is used to cause the filtered RFID tags to send the RFID tag response message.

5. The method according to claim 1, characterized in that, The method further includes: Before sending the main RFID query command, an RFID carrier is sent and maintained for a first time interval; Stop transmitting radio frequency carriers during the second time interval; The radio frequency carrier is transmitted at the end of the second time interval and maintained until the response message from the radio frequency tag is received.

6. The method according to claim 1, characterized in that, The method further includes: A radio frequency carrier is sent before the master RFID query command is sent and is maintained until the slave RFID response message is received; Before receiving the RFID tag response message from the RFID tag, a detection start command from the RFID tag is sent.

7. A response method for a master RFID tag, characterized in that, The method includes: Receive a master RFID tag query command, the master RFID tag query command includes a master RFID tag filtering instruction and a master RFID tag activation signal generation instruction sent sequentially, the master RFID tag filtering instruction includes the identification information of the master RFID tag to be queried, and the master RFID tag activation signal generation instruction instructs the master RFID tag to be queried to generate the activation signal; Based on the identification information in the master RFID tag query command, determine whether the master RFID tag query command was sent to oneself; and In response to the master RFID tag query command being sent to itself, an activation signal is generated. The activation signal can be received by the slave RFID tag connected to itself, and after receiving the activation signal, the slave RFID tag sends a slave RFID tag response message, which includes the identification information of the slave RFID tag.

8. The method according to claim 7, characterized in that, The master RFID tag query command also includes a master RFID tag inventory instruction. After responding to the master RFID tag query command being sent to itself, the method further includes: Send a primary RFID tag response message, which includes the identification information of the primary RFID tag.

9. A response method for receiving data from an RFID tag, characterized in that: The slave RFID tag can be used in conjunction with the master RFID tag to determine item matching relationships. The master RFID tag is configured to receive a master RFID tag query command. The master RFID tag query command includes a master RFID tag filtering instruction and a master RFID tag activation signal generation instruction sent sequentially. The master RFID tag filtering instruction includes the identification information of the master RFID tag to be queried. The master RFID tag activation signal generation instruction instructs the master RFID tag to be queried to generate the activation signal. The method includes: Activation signal detection is initiated at the activation signal detection time; and In response to the detection of the activation signal, a response message from the RFID tag is sent, the response message from the RFID tag including the identification information of the RFID tag.

10. The method according to claim 9, characterized in that, The activation signal detection time is the time when the RFID tag is powered on.

11. The method according to claim 9, characterized in that, The activation signal detection time is the time when the RFID tag receives the RFID tag activation detection command sent to itself, plus a preset time interval.

12. The method according to claim 9, characterized in that, In response to the detection of an activation signal, a response message is sent from the RFID tag, including: In response to the detection of an activation signal, an activation flag is written to a preset address in the data storage area; Receive a query command from an RFID tag, the query command from an RFID tag including a specified address and feature data of a data storage area; Read data from a specified address in the data storage area and compare whether the read data is the same as the feature data; In response to the read data being identical to the feature data, the RFID tag response message is sent.

13. The method according to claim 12, characterized in that, The RFID tag query command includes a RFID tag filtering instruction and an RFID tag inventory instruction sent sequentially. The RFID tag filtering instruction includes a specified address of the data storage area and the feature data. The RFID tag filtering instruction is used to filter out RFID tags that store the feature data at the specified address in the data storage area. The RFID tag inventory instruction is used to cause the filtered RFID tags to send the RFID tag response message.

14. An RFID tag assembly, characterized in that, The radio frequency tag component includes: A master RFID tag configured to generate an activation signal in response to receiving a master RFID query command sent to the master RFID tag, the master RFID tag including a first RFID chip, a first connection port, and a first antenna, the first RFID chip having an antenna port and a voltage output port, the first antenna being coupled to the antenna port of the first RFID chip, the first RFID chip being configured to output a drive voltage at its voltage output port in response to receiving a master RFID query command sent to the master RFID tag from its antenna port, to generate an activation signal at the voltage output port; and A slave RFID tag is configured to send a slave RFID tag response message in response to detecting the activation signal. The slave RFID tag response message includes the identification information of the slave RFID tag. The slave RFID tag includes a second RFID tag chip, a second connection port, and a second antenna. The second RFID tag chip has an antenna port and a status detection port. The second antenna is coupled to the antenna port of the second RFID tag chip. The second RFID tag chip is configured to send a slave RFID tag response message through the second antenna in response to detecting the activation signal from its status detection port. The slave RFID tag response message includes the identification information of the slave RFID tag. The first connection port can be connected to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip so that the activation signal generated by the slave RFID chip to the master RFID chip can be detected.

15. The radio frequency tag assembly according to claim 14, characterized in that, After the first connection port is connected to the second connection port, the first antenna is further coupled to the second antenna.

16. The radio frequency tag assembly according to claim 14, characterized in that, The main RFID tag also includes an energy storage device, which is coupled to the voltage output port of the first RFID tag chip. The energy storage device can store the electrical energy output by the voltage output port of the first RFID tag chip to generate the activation signal.

17. The radio frequency tag assembly according to claim 16, characterized in that, The energy storage device is a capacitor.

18. The radio frequency tag assembly according to claim 14, characterized in that, The first antenna includes a first branch and a second branch, and the first branch and the second branch of the first antenna are respectively coupled to two terminals of the antenna port of the first radio frequency tag chip.

19. The radio frequency tag assembly according to claim 18, characterized in that, The second antenna includes a first branch and a second branch, and the first branch and the second branch of the second antenna are respectively coupled to two terminals of the antenna port of the second RFID chip.

20. The radio frequency tag assembly according to claim 19, characterized in that, After the first connection port is connected to the second connection port, the first branch or the second branch of the first antenna is coupled to the first branch or the second branch of the second antenna.

21. The radio frequency tag assembly according to claim 14, characterized in that, The second RFID chip determines that the activation signal has been detected when it detects a high level at its status detection port.

22. The radio frequency tag assembly according to claim 14, characterized in that, The RFID tag also includes a switch module, which has a voltage input port and a connection port. The connection port of the switch module is coupled to the status detection port of the second RFID tag chip. When the first connection port is connected to the second connection port, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module. The switch module is configured to control the first and second terminals of its connection port to conduct in response to the voltage of its voltage input port being higher than the conduction voltage. The second RFID tag chip determines that the activation signal has been detected in response to detecting that the first and second terminals of its status detection port are conducting.

23. The radio frequency tag assembly according to claim 22, characterized in that, The switching module is a field-effect transistor (FET). The gate and source of the FET constitute the voltage input port of the switching module, and the drain and source of the FET constitute the connection port of the switching module.

24. A master radio frequency tag, characterized in that, The master RFID tag can be used in conjunction with a slave RFID tag to determine item matching relationships. The master RFID tag is configured to generate an activation signal in response to receiving a master RFID tag query command sent to the master RFID tag. The slave RFID tag is configured to send a slave RFID tag response message in response to detecting the activation signal. The slave RFID tag response message includes the identification information of the slave RFID tag. The master RFID tag includes: A first RFID chip has an antenna port and a voltage output port. In response to receiving a master RFID query command sent to the master RFID from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port to generate an activation signal at the voltage output port. First connection port; and The first antenna is coupled to the antenna port of the first RFID tag chip. The slave RFID tag includes a second RFID chip, a second connection port, and a second antenna. The second RFID chip has an antenna port and a status detection port. The second antenna is coupled to the antenna port of the second RFID chip. The second RFID chip is configured to send a slave RFID response message through the second antenna in response to detecting the activation signal from its status detection port. The slave RFID response message includes the identification information of the slave RFID tag. The first connection port can be connected to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip.

25. The main RFID tag according to claim 24, characterized in that, The main RFID tag also includes an energy storage device, which is coupled to the voltage output port of the first RFID tag chip. The energy storage device can store the electrical energy output by the voltage output port of the first RFID tag chip to generate the activation signal.

26. The main RFID tag according to claim 25, characterized in that, The energy storage device is a capacitor.

27. A radio frequency tag, characterized in that, The slave RFID tag can be used in conjunction with the master RFID tag to determine item matching relationships. The slave RFID tag is configured to send a master RFID tag response message in response to detecting an activation signal. The master RFID tag response message includes the identification information of the master RFID tag. The master RFID tag is configured to generate the activation signal in response to receiving a master RFID tag query command sent to the master RFID tag. The slave RFID tag includes: The second RFID tag chip has an antenna port and a status detection port; Second connection port; and A second antenna is coupled to the antenna port of the second RFID chip. In response to detecting the activation signal from its status detection port, the second RFID chip sends the RFID tag response message via the second antenna. The master RFID tag includes a first RFID chip, a first connector, and a first antenna. The first RFID chip has an antenna port and a voltage output port. The first antenna is coupled to the antenna port of the first RFID chip. In response to receiving a master RFID query command sent to the master RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port to generate an activation signal at the voltage output port. The first connection port can be connected to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the status detection port of the second RFID chip.

28. The RFID tag according to claim 27, characterized in that, The second RFID chip is configured to determine that the activation signal has been detected in response to a high level detected at its status detection port.

29. The radio frequency tag according to claim 27, characterized in that, The RFID tag also includes a switch module, which has a voltage input port and a connection port. The connection port of the switch module is coupled to the status detection port of the second RFID tag chip. When the first connection port is connected to the second connection port, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module. In response to the voltage of its voltage input port being higher than the conduction voltage, the switch module conducts the first and second terminals of its connection port. The second RFID tag chip is configured to detect the activation signal in response to detecting the conduction of the first and second terminals of its status detection port.

30. The radio frequency tag according to claim 29, characterized in that, The switching module is a field-effect transistor (FET). The gate and source of the FET constitute the voltage input port of the switching module, and the drain and source of the FET constitute the connection port of the switching module.

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