CN112699694A - Tag detection circuit of reader-writer and reader-writer - Google Patents
Tag detection circuit of reader-writer and reader-writer Download PDFInfo
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- CN112699694A CN112699694A CN202110305048.3A CN202110305048A CN112699694A CN 112699694 A CN112699694 A CN 112699694A CN 202110305048 A CN202110305048 A CN 202110305048A CN 112699694 A CN112699694 A CN 112699694A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a label detection circuit of a reader-writer and the reader-writer, wherein the circuit at least comprises a shaping module and a detection module, and the shaping module is connected with the detection module; the detection module is used for sending a first voltage signal to an analog front-end circuit of the reader-writer; the shaping module is used for receiving a detection signal fed back by the analog front-end circuit, shaping the detection signal to obtain a shaping signal, and sending the shaping signal to the detection module; the detection module is further used for determining whether a tag exists in a radio frequency field of the reader-writer according to the first voltage signal and the pre-configured second voltage signal when the detection signal is determined to be an effective signal according to the shaping signal, and sending a starting signal for identifying the tag to a control circuit of the reader-writer when the tag exists in the radio frequency field, so that whether the tag exists in the radio frequency field of the reader-writer can be quickly detected, and the control circuit on the reader-writer is started to execute subsequent tag information identification operation when the tag exists in the radio frequency field, so that the power consumption of the reader-writer is reduced.
Description
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a tag detection circuit of a reader-writer and the reader-writer.
Background
Radio Frequency Identification (RFID) is one of automatic Identification technologies, and is widely used in the fields of logistics, anti-counterfeiting, food, traffic, identity Identification and the like, and a tag is read and written in a form of a wireless Radio Frequency signal based on a non-contact mode.
In some applications, the RFID reader does not need to work all the time. For example, in the application of entrance guard, the reader-writer only needs to be used when a card is available, the rest of the time is in an idle state, if a command is sent all the time to detect the tag, a large amount of time is spent, high power consumption is maintained all the time, and the command operation is invalid.
Disclosure of Invention
The invention provides a tag detection circuit of a reader-writer and the reader-writer, aiming at the problems in the prior art.
The invention provides a label detection circuit of a reader-writer, which at least comprises a shaping module and a detection module, wherein the shaping module is connected with the detection module;
the detection module is used for sending a first voltage signal to an analog front-end circuit of the reader-writer;
the shaping module is used for receiving a detection signal fed back by the analog front-end circuit, shaping the detection signal to obtain a shaped signal, and sending the shaped signal to the detection module; the detection signal is generated by the analog front-end circuit according to a first voltage signal;
the detection module is further configured to determine whether a tag exists in the radio frequency field of the reader-writer according to the first voltage signal and the preconfigured second voltage signal when the detection signal is determined to be an effective signal according to the shaping signal, and send a start signal for identifying the tag to a control circuit of the reader-writer when the tag exists in the radio frequency field.
According to the label detection circuit of the reader-writer provided by the invention, the label detection circuit further comprises a register module, wherein the register module is respectively connected with the shaping module and the detection module;
the register module is used for storing control signals for the shaping module and the detection module, and sending the control signals to the shaping module and the detection module so that the shaping module and the detection module complete execution actions according to the control signals;
the register module is further configured to store the second voltage signal and send the second voltage signal to the detection module.
According to the tag detection circuit of the reader-writer provided by the invention, the detection module comprises a counting module, a counting comparison module, a polling module, a voltage comparison module and a starting module, wherein the shaping module is connected with the counting module, the counting module is connected with the counting comparison module, the counting comparison module is connected with the polling module, the polling module is connected with the voltage comparison module, and the voltage comparison module is connected with the starting module;
the polling module is used for sending a first voltage signal to the analog front-end circuit in a polling mode;
the counting module is used for determining the number of high levels according to the shaping signals;
the counting comparison module is used for comparing the number of the high levels with a preset effective number to obtain a first comparison result, and the first comparison result represents whether the detection signal is an effective signal;
the polling module is further configured to send the first comparison result to the voltage comparison module when the detection signal is an effective signal;
the voltage comparison module is used for determining a second comparison result according to the first voltage signal and a pre-configured second voltage signal when the detection signal is an effective signal, and the second comparison result represents whether a tag exists in a radio frequency field of the reader-writer;
and the starting module is used for sending a starting signal for identifying the label to a control circuit of the reader-writer when the radio frequency field of the reader-writer has the label.
According to the label detection circuit of the reader-writer provided by the invention, the detection module further comprises a modification module, and the modification module is connected with the register module;
the register module is also used for storing the pre-configured detection time;
and the modification module is used for determining the counting period and the effective number according to the detection time.
According to the tag detection circuit of the reader-writer provided by the invention, the shaping module comprises a first shaping module, a second shaping module and a fusion module, wherein:
the first shaping module is used for carrying out synchronization and edge detection on the detection signal according to a pre-input clock signal to obtain a first detection signal;
the second shaping module is used for carrying out synchronization and edge detection on the detection signal according to a pre-input clock signal to obtain a second detection signal;
and the fusion module is used for obtaining a shaping signal according to the first detection signal and the second detection signal.
According to the tag detection circuit of the reader-writer provided by the invention, the first shaping module comprises a first synchronization module and a first edge detection module, and the second shaping module comprises a second synchronization module and a second edge detection module, wherein:
the first synchronization module is used for carrying out multi-stage synchronization processing on the detection signal according to the rising edge of the clock signal;
the first edge detection module is used for detecting the falling edge of the synchronous detection signal to obtain a first detection signal;
the second synchronization module is used for performing multi-stage synchronization processing on the detection signal according to the falling edge of the clock signal;
and the second edge detection module is used for carrying out rising edge detection on the synchronous detection signal to obtain a second detection signal.
According to the label detection circuit of the reader-writer provided by the invention, the register module is connected with the control circuit of the reader-writer;
the register module is further configured to receive configuration information of the control circuit, and configure the first voltage signal and the control signal according to the configuration information.
According to the tag detection circuit of the reader-writer provided by the invention, the register module is further used for configuring detection time according to the clock signal.
According to the tag detection circuit of the reader-writer, the fusion module is an AND gate circuit.
The present invention also provides a reader/writer, which at least includes the above tag detection circuit, analog front end circuit, control circuit and antenna coil, wherein:
the tag detection circuit is used for sending a first voltage signal to an analog front-end circuit of the reader-writer;
the analog front-end circuit is used for processing a first voltage signal with the antenna coil to generate a detection signal and sending the detection signal to the label detection circuit;
the tag detection circuit is used for sending a starting signal for identifying the tag to the control circuit when the tag is determined to exist in the radio frequency field of the reader-writer according to the detection signal;
and the control circuit is used for identifying the content of the label according to the starting signal.
The label detection circuit of the reader-writer and the reader-writer can quickly detect whether the label exists in the radio frequency field of the reader-writer or not, and enable the control circuit on the reader-writer to start and execute subsequent label information identification operation when the label exists in the radio frequency field, so that the power consumption of the reader-writer is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a tag detection circuit of a reader/writer according to the present invention;
FIG. 2 is a schematic structural diagram of a shaping module provided in the present invention;
FIG. 3 is a waveform diagram of a shaped signal provided by the present invention;
fig. 4 is a schematic structural diagram of a reader/writer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Radio Frequency Identification (RFID) is one of automatic Identification technologies, and is widely used in the fields of logistics, anti-counterfeiting, food, traffic, identity Identification and the like, and a tag is read and written in a form of a wireless Radio Frequency signal based on a non-contact mode.
In some applications, the RFID reader does not need to work all the time. For example, in the application of entrance guard, the reader-writer only needs to be used when a card is available, the rest of the time is in an idle state, if a command is sent all the time to detect the tag, a large amount of time is spent, high power consumption is maintained all the time, and the command operation is invalid.
Therefore, the tag detection circuit needs to be added on the reader-writer, and the tag detection circuit needs to be capable of quickly and efficiently detecting that the tag enters a radio frequency field of the reader-writer so as to establish communication between the subsequent reader-writer and the tag.
The following describes a tag detection circuit of a reader/writer and a reader/writer according to the present invention with reference to fig. 1 to 4.
Fig. 1 shows a schematic structural diagram of a tag detection circuit of a reader/writer according to the present invention, and referring to fig. 1, the tag detection circuit of the reader/writer at least includes a shaping module 11 and a detection module 12, where the shaping module 11 is connected to the detection module 12.
The detection module 12 is configured to send a first voltage signal to an analog front-end circuit of the reader/writer;
the shaping module 11 is configured to receive a detection signal fed back by the analog front-end circuit, shape the detection signal to obtain a shaped signal, and send the shaped signal to the detection module 12; the detection signal is a signal generated by the analog front-end circuit according to the first voltage signal;
the detection module 11 is further configured to determine whether a tag exists in the radio frequency field of the reader/writer according to the first voltage signal and the preconfigured second voltage signal when the detection signal is determined to be an effective signal according to the shaping signal, and send a start signal for identifying the tag to a control circuit of the reader/writer when the tag exists in the radio frequency field.
In this regard, it should be noted that the reader/writer generally includes a control circuit, an analog front-end circuit, and an antenna coil, and in the tag identification process, the control circuit sends a carrier signal to the analog front-end circuit, and the carrier signal is processed by the analog front-end circuit and then applied to the antenna coil. When the tag is close to the antenna coil, the carrier signal (the carrier signal has tag content) on the antenna coil is fed back to the analog front-end circuit, and the analog front-end circuit processes the carrier signal and feeds back the processed carrier signal to the control circuit, so that the control circuit identifies the content on the tag.
In the invention, the tag detection circuit of the reader-writer also needs to interact with the analog front-end circuit and the antenna coil to detect whether the tag exists in the radio frequency field of the reader-writer. For this purpose, the detection module of the tag detection circuit sends a first voltage signal to the analog front-end circuit, and the analog front-end circuit feeds back a detection signal according to the first voltage signal. The detection signal is received by the shaping module, the shaping module carries out shaping processing on the detection signal to obtain a shaped signal, and the shaped signal is sent to the detection module. The shaping module processes the detection signal in two paths based on the clock signal, and combines the two processed signals to obtain a shaped signal.
In the present invention, the detection signal fed back by the analog front-end circuit is not necessarily a valid signal due to the influence of the detection environment. Therefore, the detection module firstly determines that the detection signal is an effective signal according to the shaping signal, and then carries out numerical comparison according to the first voltage signal and the pre-configured second voltage signal, so as to determine whether the radio frequency field of the reader-writer has a label or not according to the comparison result.
For example, if the first voltage signal is greater than the second voltage signal, it indicates that the rf field has a tag. The first voltage signal is less than the second voltage signal, indicating that the radio frequency field is not tagged.
When the radio frequency field has a label, the detection module sends a starting signal for identifying the label to a control circuit of the reader-writer. After the control circuit obtains the starting signal, the control circuit sends a signal and energy to the label so as to realize information identification of the label.
The label detection circuit of the reader-writer can quickly detect whether the label exists in the radio frequency field of the reader-writer or not, and enables the control circuit on the reader-writer to start and execute subsequent label information identification operation when the label exists in the radio frequency field, so that the power consumption of the reader-writer is reduced.
In the further invention of the tag detection circuit of the reader-writer, which is mainly a further explanation of the tag detection circuit, the tag detection circuit further includes a register module 13, and the register module 13 is used for storing instructions and data. In the present invention, the register module 13 is connected to the shaping module 11 and the detection module 12, respectively, and is used for servicing the working processes of the shaping module and the detection module.
The register module stores control signals for the shaping module and the detection module, and sends the control signals to the shaping module and the detection module, so that the shaping module and the detection module complete execution actions according to the control signals.
The register module is also used for storing a second voltage signal and sending the second voltage signal to the detection module so that the detection module can determine whether the radio frequency field of the reader-writer has a label or not according to the first voltage signal and the second voltage signal.
The label detection circuit of the reader-writer is further provided with the register module, so that the front-end preparation work of executing actions of the shaping module and the detection module is realized, and data support is provided for the shaping module and the detection module.
In the further invention of the tag detection circuit of the reader/writer, the further explanation of the detection module is mainly as follows:
the detection module 12 includes a counting module 121, a counting comparison module 122, a polling module 123, a voltage comparison module 124 and a starting module 125, wherein the shaping module 11 is connected to the counting module 121, the counting module 121 is connected to the counting comparison module 122, the counting comparison module 122 is connected to the polling module 123, the polling module 123 is connected to the voltage comparison module 124, and the voltage comparison module 124 is connected to the starting module 125.
And the polling module is used for sending a first voltage signal to the analog front-end circuit in a polling mode.
And the counting module is used for determining the number of high levels according to the shaping signals.
And the counting comparison module is used for comparing the high level number with the preset effective number to obtain a first comparison result, and the first comparison result represents whether the detection signal is an effective signal.
And the polling module is also used for sending the first comparison result to the voltage comparison module when the detection signal is an effective signal.
And the voltage comparison module is used for determining a second comparison result according to the first voltage signal and a pre-configured second voltage signal when the detection signal is an effective signal, and the second comparison result represents whether the radio frequency field of the reader-writer has a label or not.
And the starting module is used for sending a starting signal for identifying the label to a control circuit of the reader-writer when the label exists in the radio frequency field of the reader-writer.
In this regard, it should be noted that, in the present invention, the polling module sends the first voltage signal to the analog front-end circuit by a polling method. For example, the first voltage signal has a value in the range of 2V to 1V. In the polling process, 2V is firstly sent to the analog front-end circuit, and when the detection signal is determined to be an invalid signal, 1.9V is sent to the analog front-end circuit.
In the present invention, whether the detection signal is valid is determined specifically as follows: the shaping signal is a waveform signal, and the counting module determines the number of high levels in a period of time according to the shaping signal. And the counting comparison module compares the determined high level number with the pre-configured effective number to obtain a first comparison result, and then determines whether the detection signal is an effective signal according to the first comparison result.
For example, if the number of high levels is greater than the number of valid levels, the detection signal is a valid signal.
The polling module informs the voltage comparison module of the first comparison result after determining that the detection signal is an effective signal according to the first comparison result.
And the voltage comparison module determines whether the radio frequency field of the reader-writer has a label or not according to the first voltage signal and the pre-configured second voltage signal after determining that the detection signal is an effective signal according to the first comparison result. When the radio frequency field is determined to have the label, the starting module sends a starting signal for identifying the label to a control circuit of the reader-writer, and the control circuit sends a signal and energy to the label after obtaining the starting signal so as to realize information identification of the label.
The tag detection circuit of the reader-writer further provided by the invention can determine whether the detection signal is effective or not by counting the number of high levels in the waveform signal and comparing the number of the high levels with the effective number, can effectively judge the signal by reasonable signal characteristics, and can determine whether a tag exists in a radio frequency field or not according to the comparison of voltage values when the signal is effective, so that the tag detection circuit is more intuitive.
In the further invention of the tag detection circuit of the reader/writer, which is mainly a further explanation of the detection module, the detection module 12 further includes a modification module 126, and the modification module 126 is connected to the register module 13.
The register module is also used for storing the pre-configured detection time.
And the modification module is used for determining the counting period and the effective number according to the detection time.
In this regard, it should be noted that, in the present invention, the register module determines the detection time of the tag detection circuit based on the clock signal, where the detection time is a time period within which the number of high levels of the waveform signal can be counted. The register module sends the detection time to the modification module, and the modification module determines the counting period and the effective number according to the detection time. Different detection times correspond to different counting cycles and valid numbers.
In addition, the register module is further configured to receive configuration information of the control circuit, and configure the first voltage signal, the control signal, and the start configuration policy according to the configuration information. The start configuration policy is used to configure different operational actions for different instances of the second comparison result.
In the further invention of the tag detection circuit of the reader/writer, the further explanation of the shaping module is mainly as follows:
the shaping module 11 comprises a first shaping module, a second shaping module and a fusion module 115, wherein:
the first shaping module is used for carrying out synchronization and edge detection on the detection signal according to a pre-input clock signal to obtain a first detection signal;
the second shaping module is used for carrying out synchronization and edge detection on the detection signal according to the clock signal which is input in advance to obtain a second detection signal;
and the fusion module is used for obtaining a shaping signal according to the first detection signal and the second detection signal.
To explain further, the first shaping module includes a first synchronization module 111 and a first edge detection module 112, and the second shaping module includes a second synchronization module 113 and a second edge detection module 114, wherein:
the first synchronization module is used for carrying out multi-stage synchronization processing on the detection signal according to the rising edge of the clock signal;
the first edge detection module is used for detecting the falling edge of the synchronous detection signal to obtain a first detection signal;
the second synchronization module is used for carrying out multi-stage synchronization processing on the detection signal according to the falling edge of the clock signal;
and the second edge detection module is used for carrying out rising edge detection on the synchronous detection signal to obtain a second detection signal.
In this regard, in the present invention, the detection signal is input to the first synchronization block and the first edge detection block, and the detection signal is synchronized in multiple stages by using a rising edge of the clock signal under the clock signal, and the detection of the falling edge is performed according to the synchronized signal.
Correspondingly, the detection signal is input into the second synchronization module and the second edge detection module, and the detection signal is subjected to multi-stage synchronization by adopting the falling edge of the clock signal under the clock signal, and is subjected to rising edge detection according to the synchronized signal to obtain a second detection signal.
And then, the fusion module is used for obtaining a shaping signal according to the first detection signal and the second detection signal. In the present invention, the fusion module may employ an and circuit.
The label detection circuit of the reader-writer further provided by the invention is used for respectively carrying out synchronization and edge detection on detection signals in two paths based on the clock signal and then fusing the detection signals into the shaping signal, so that the detection signals are conveniently and reasonably integrated, and the subsequent high-level number statistics is convenient.
Fig. 2 is a schematic diagram of a specific structure of the shaping module, and referring to fig. 2, the clock signal clk is a clock signal with a frequency of 27.12MHz/s, the reset signal rst, the detection signal det is a signal input by the analog front-end circuit, and the shaping signal det _ o.
The det signal is input from an analog front-end circuit, belongs to an asynchronous input signal, and is required to be subjected to two-stage synchronization before the signal is used so as to remove a metastable state problem caused by clock domain crossing, avoid disorder of data output and obtain det _ psync and det _ nsync signals after synchronization. The synchronized det _ psync signal is subjected to two-stage falling edge detection and OR operation, so as to convert the original det signal falling edge into a high level with the period of a clock with the frequency of 13.56 MHz/s. In addition, the shaping module consists of a rising edge detection part and a falling edge detection part of a clock with the frequency of 27.12MHz/s, because a det signal is given by an analog front-end circuit, the det signal may not be a standard periodic waveform signal with the frequency of 13.56MHz/s, and because the frequency and the duty ratio of the det signal fluctuate within a certain range, the rising edge detection and the falling edge detection of the clock clk are used to ensure that the edge which cannot be detected by the rising edge of the clk is used, the falling edge of the clk can be detected, the accuracy of the detected waveform edge is improved, and the missing is prevented.
Fig. 3 is a waveform diagram of the shaping signal corresponding to fig. 2, where clk is a clock signal with a frequency of 27.12MHz, a detection signal input to an analog front end of the det signal, det _ psync and det _ nsync are signals obtained by two-stage synchronization of rising edge and falling edge of clk for det, det _ psync1 and det _ psync2 are signals obtained by two-stage synchronization of det _ psync and rising edge register, two-stage register signals, det _ nsync1 and det _ nsync2 are signals obtained by two-stage falling edge register, two-stage register signals, det _ o1 is an output for two-stage falling edge determination of det _ psync, det _ o2 is an output for two-stage falling edge determination of det _ nsync, and det _ o is an output for final shaping of the det signal. It can be seen that the det signal is not a standard 13.56MHz/s pulse waveform, if clk single edge is used for sampling to obtain a shaped output, for example, a rising edge, then the corresponding shaped output is det _ o1, it can be seen that there are some positions which are not always high levels, and these positions are places where there is omission or sampling error, if output det _ o2 adopted by a falling edge is added, it can be made up that there is no sampling place on the rising edge, the probability of sampling error is reduced by combining two kinds of edges with sampling, based on this principle, the probability of sampling error omission can be greatly reduced, and the det tolerance is larger.
The tag detection circuit of the reader-writer can quickly detect whether the tag exists in the radio frequency field of the reader-writer, and enables the control circuit on the reader-writer to start and execute subsequent tag information identification operation when the tag exists in the radio frequency field, so that the power consumption of the reader-writer is reduced.
As shown in fig. 4, the present invention also provides a reader/writer, which at least includes the above-mentioned tag detection circuit 41, analog front-end circuit 42, control circuit 43, and antenna coil 44, wherein:
a tag detection circuit 41 for sending a first voltage signal to an analog front-end circuit of the reader/writer;
an analog front-end circuit 42, configured to process the first voltage signal with an antenna coil 44 to generate a detection signal, and send the detection signal to the tag detection circuit;
the tag detection circuit 41 is configured to send a start signal for identifying a tag to the control circuit when it is determined that the tag is present in the radio frequency field of the reader/writer according to the detection signal;
and a control circuit 43 for performing content identification on the tag according to the start signal.
In this regard, it should be noted that, in the present invention, the tag detection circuit of the reader/writer also needs to interact with the analog front end circuit and the antenna coil to detect whether the tag exists in the radio frequency field of the reader/writer. When the radio frequency field has a label, the label detection circuit sends a starting signal for identifying the label to a control circuit of the reader-writer. After the control circuit obtains the starting signal, the control circuit sends a signal and energy to the label so as to realize information identification of the label.
Based on the above detailed description of the detection process of the tag detection circuit for detecting whether the tag exists in the radio frequency field, no further description is given here.
The reader-writer provided by the invention can quickly detect whether the label exists in the radio frequency field of the reader-writer, and when the label exists in the radio frequency field, the control circuit on the reader-writer starts to execute the subsequent label information identification operation, so that the power consumption of the reader-writer is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A label detection circuit of a reader-writer is characterized by at least comprising a shaping module and a detection module, wherein the shaping module is connected with the detection module;
the detection module is used for sending a first voltage signal to an analog front-end circuit of the reader-writer;
the shaping module is used for receiving a detection signal fed back by the analog front-end circuit, shaping the detection signal to obtain a shaped signal, and sending the shaped signal to the detection module; the detection signal is generated by the analog front-end circuit according to a first voltage signal;
the detection module is further configured to determine whether a tag exists in the radio frequency field of the reader-writer according to the first voltage signal and the preconfigured second voltage signal when the detection signal is determined to be an effective signal according to the shaping signal, and send a start signal for identifying the tag to a control circuit of the reader-writer when the tag exists in the radio frequency field.
2. The tag detection circuit of claim 1, further comprising a register module, wherein the register module is connected to the shaping module and the detection module respectively;
the register module is used for storing control signals for the shaping module and the detection module, and sending the control signals to the shaping module and the detection module so that the shaping module and the detection module complete execution actions according to the control signals;
the register module is further configured to store the second voltage signal and send the second voltage signal to the detection module.
3. The tag detection circuit of a reader/writer according to claim 2, wherein said detection module comprises a counting module, a count comparison module, a polling module, a voltage comparison module and an activation module, wherein said shaping module is connected to said counting module, said counting module is connected to said count comparison module, said count comparison module is connected to said polling module, said polling module is connected to said voltage comparison module, and said voltage comparison module is connected to said activation module;
the polling module is used for sending a first voltage signal to the analog front-end circuit in a polling mode;
the counting module is used for determining the number of high levels according to the shaping signals;
the counting comparison module is used for comparing the number of the high levels with a preset effective number to obtain a first comparison result, and the first comparison result represents whether the detection signal is an effective signal;
the polling module is further configured to send the first comparison result to the voltage comparison module when the detection signal is an effective signal;
the voltage comparison module is used for determining a second comparison result according to the first voltage signal and a pre-configured second voltage signal when the detection signal is an effective signal, and the second comparison result represents whether a tag exists in a radio frequency field of the reader-writer;
and the starting module is used for sending a starting signal for identifying the label to a control circuit of the reader-writer when the radio frequency field of the reader-writer has the label.
4. The tag detection circuit of claim 3, wherein the detection module further comprises a modification module, the modification module being connected to the register module;
the register module is also used for storing the pre-configured detection time;
and the modification module is used for determining the counting period and the effective number according to the detection time.
5. The tag detection circuit of a reader/writer according to claim 4, wherein said shaping module comprises a first shaping module, a second shaping module and a fusion module, wherein:
the first shaping module is used for carrying out synchronization and edge detection on the detection signal according to a pre-input clock signal to obtain a first detection signal;
the second shaping module is used for carrying out synchronization and edge detection on the detection signal according to a pre-input clock signal to obtain a second detection signal;
and the fusion module is used for obtaining a shaping signal according to the first detection signal and the second detection signal.
6. The tag detection circuit of claim 5, wherein the first shaping module comprises a first synchronization module and a first edge detection module, and the second shaping module comprises a second synchronization module and a second edge detection module, wherein:
the first synchronization module is used for carrying out multi-stage synchronization processing on the detection signal according to the rising edge of the clock signal;
the first edge detection module is used for detecting the falling edge of the synchronous detection signal to obtain a first detection signal;
the second synchronization module is used for performing multi-stage synchronization processing on the detection signal according to the falling edge of the clock signal;
and the second edge detection module is used for carrying out rising edge detection on the synchronous detection signal to obtain a second detection signal.
7. The tag detection circuit of claim 6, wherein the register module is connected to a control circuit of the reader;
the register module is further configured to receive configuration information of the control circuit, and configure the first voltage signal and the control signal according to the configuration information.
8. The tag detection circuit of claim 7, wherein the register module is further configured to configure a detection time according to the clock signal.
9. The tag detection circuit of claim 5, wherein the fusion module is an AND gate.
10. A reader/writer characterized by comprising at least the tag detection circuit, the analog front end circuit, the control circuit, and the antenna coil of any one of claims 1 to 9, wherein:
the tag detection circuit is used for sending a first voltage signal to an analog front-end circuit of the reader-writer;
the analog front-end circuit is used for processing a first voltage signal with the antenna coil to generate a detection signal and sending the detection signal to the label detection circuit;
the tag detection circuit is used for sending a starting signal for identifying the tag to the control circuit when the tag is determined to exist in the radio frequency field of the reader-writer according to the detection signal;
and the control circuit is used for identifying the content of the label according to the starting signal.
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