Multifunctional certificate identification circuit and multifunctional certificate identification equipment

Abstract

The embodiment of the utility model provides a multifunctional certificate identification circuit and multifunctional certificate identification equipment. The multifunctional certificate identification circuit comprises a sensor signal output circuit, a sensor signal enhancement circuit, a sensor signal processing circuit, a control and data processing circuit, a radio frequency transceiver circuit and a power supply circuit, the sensor signal output circuit is used for detecting ambient light change to generate a sensor output signal; the sensor signal enhancement circuit is used for performing signal enhancement on the sensor output signal transmitted by the sensor signal output circuit; the sensor signal processing circuit is used for processing signals to generate sensor digital signals; the control and data processing circuit is used for receiving the sensor digital signal transmitted by the sensor signal processing circuit, performing logic judgment on the sensor digital signal and generating a radio frequency control signal; the radio frequency transceiver circuit is used for receiving the radio frequency control signal transmitted by the control and data processing circuit and controlling the on or off of the radio frequency antenna according to the radio frequency control signal; the power circuit is used for providing power.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit control, in particular to a multifunctional document recognition circuit and a multifunctional document recognition device. Background Art

[0002] With the popularization of the real-name system, when checking into a hotel, opening a bank account, surfing the Internet in an Internet cafe, handling telecommunications services, registering for an exam, entering and exiting the country, etc., it is necessary to register, verify, and even scan or copy the documents for record. The document recognition equipment in the prior art has replaced the less efficient manual verification and registration method. The document recognition equipment can not only have the document recognition function of identity cards, passports, Hong Kong and Macao passes, and driver's licenses, but also have a code scanning function. However, when the document recognition equipment recognizes the QR code or barcode on an electronic device with a near field communication (NFC) function (for example, a mobile phone), the RF antenna of the document recognition equipment will be sensed by the NFC, thereby automatically triggering the NFC function of the electronic device. At this time, the QR code or barcode displayed on the screen will be covered by the NFC interface, resulting in the failure of the QR code or barcode recognition. Utility Model Content

[0003] The present application provides a multifunctional document recognition circuit and a multifunctional document recognition device, which solve the problem of failure of two-dimensional code or barcode recognition caused by automatic triggering of NFC of electronic equipment in the prior art.

[0004] In a first aspect, according to an embodiment of the present application, a multifunctional document recognition circuit is provided, comprising:

[0005] A sensor signal output circuit, used for detecting changes in ambient light and generating a sensor output signal;

[0006] a sensor signal enhancement circuit, wherein the output end of the sensor signal output circuit is electrically connected to the input end of the sensor signal enhancement circuit, and the sensor signal enhancement circuit is used to enhance the sensor output signal transmitted by the sensor signal output circuit;

[0007] A sensor signal processing circuit, wherein the output end of the sensor signal enhancement circuit is electrically connected to the input end of the sensor signal processing circuit, and the sensor signal processing circuit is used to perform signal processing on the sensor output signal after signal enhancement to generate a sensor digital signal;

[0008] A control and data processing circuit, wherein the output end of the sensor signal processing circuit is electrically connected to the input end of the control and data processing circuit, and the control and data processing circuit is used to receive the sensor digital signal transmitted by the sensor signal processing circuit, and perform logic judgment on the sensor digital signal to generate a radio frequency control signal;

[0009] A radio frequency transceiver circuit, the radio frequency transceiver circuit is electrically connected to the control and data processing circuit, the radio frequency transceiver circuit is used to receive the radio frequency control signal transmitted by the control and data processing circuit, and control the opening or closing of the radio frequency antenna according to the radio frequency control signal;

[0010] The power supply circuit is electrically connected to the control and data processing circuit and is used to provide power.

[0011] In some embodiments of the present application, it also includes:

[0012] A USB interface circuit is electrically connected to the control and data processing circuit.

[0013] In some embodiments of the present application, the USB interface circuit includes a connector J1, a capacitor C1, a capacitor C2, a magnetic bead FB1, a resistor R1, and a resistor R2;

[0014] The GND pin of the connector J1 is grounded, the DP pin of the connector J1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the USB_DP signal, the DN pin of the connector J1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the USB_DN signal, the Vbus pin of the connector J1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, one end of the magnetic bead FB1, and the voltage bus power supply VBUS, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and the other end of the magnetic bead FB1 is electrically connected to the +5V power supply.

[0015] In some embodiments of the present application, the sensor signal output circuit includes a photosensor U1, a photosensor U2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, and a connector J2;

[0016] The power supply end of the photosensor U1 is respectively connected to one end of the capacitor C4 and the power supply VDD, and the other end of the capacitor C4 is grounded. The output end of the photosensor U1 is respectively connected to one end of the resistor R3, one end of the capacitor C3, and the 1IN pin of the connector J2, the other end of the resistor R3 and the other end of the capacitor C3 are grounded, the GND pin of the connector J2 is grounded, and the VDD pin of the connector J2 is electrically connected to the power supply VDD. The power supply end of the photosensor U2 is respectively connected to one end of the capacitor C5 and the power supply VDD, and the other end of the capacitor C5 is grounded. The output end of the photosensor U2 is respectively connected to one end of the resistor R4, one end of the capacitor C6, and the 2IN pin of the connector J2, and the other end of the resistor R4 and the other end of the capacitor C6 are grounded.

[0017] In some embodiments of the present application, the sensor signal enhancement circuit includes a connector J3, a resistor R5, a resistor R6, a capacitor C7, and a capacitor C8;

[0018] The 1OUT pin of the connector J3 is respectively connected to one end of the resistor R5, one end of the capacitor C7 and the sensor output signal GM1, the other end of the resistor R5 and the other end of the capacitor C7 are respectively grounded, the GND pin of the connector J3 is grounded, the VDD pin of the connector J3 is electrically connected to the power supply VDD, the 2OUT pin of the connector J3 is respectively connected to one end of the resistor R6, one end of the capacitor C8 and the sensor output signal GM2, the other end of the resistor R6 and the other end of the capacitor C8 are respectively grounded.

[0019] In some embodiments of the present application, the sensor signal processing circuit includes a dual integrated operational amplifier U3, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, and a resistor R12;

[0020] The 1IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R7 is electrically connected to the power supply VDD, and the other end of the resistor R8 is grounded. The 1IN+ pin of the dual-channel integrated operational amplifier U3 is connected to the sensor output signal GM1, and the 2IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R11 and one end of the resistor R12, the other end of the resistor R11 is electrically connected to the power supply VDD, and the other end of the resistor R12 is grounded. The 2IN+ pin of U3 is connected to the sensor output signal GM2, the GND pin of the dual integrated operational amplifier U3 is grounded, the VCC pin of the dual integrated operational amplifier U3 is respectively connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is electrically connected to the power supply VDD, the other end of the resistor R10 is electrically connected to the +5V power supply, the 1OUT pin of the dual integrated operational amplifier U3 is connected to the sensor digital signal GM1_COM, and the 2OUT pin of the dual integrated operational amplifier U3 is connected to the sensor digital signal GM2_COM.

[0021] In some embodiments of the present application, the control and data processing circuit includes a microprocessor U4, a resistor R13, a resistor R14, a resistor R15 and a capacitor C9;

[0022] The AD0[5] pin of the microprocessor U4 is connected to the sensor digital signal GM1_COM through the resistor R13, the AD0[4] pin of the microprocessor U4 is connected to the sensor digital signal GM2_COM through the resistor R14, the RESET pin of the microprocessor U4 is respectively connected to one end of the resistor R15 and one end of the capacitor C9, the other end of the resistor R15 is electrically connected to the power supply VDD, and the other end of the capacitor C9 is grounded; wherein, the microprocessor U4 adopts the LPC1758 chip.

[0023] In some embodiments of the present application, the RF transceiver circuit includes a RF base station chip U5, a RF base station chip U6, a connector J4, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, an inductor L1, and an inductor L2;

[0024] The IF0 pin of the RF base station chip U5 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U5 is connected to the SCK pin of the microprocessor U4, the IF2 pin of the RF base station chip U5 is connected to the MISO pin of the microprocessor U4, the IF3 / SDA pin of the RF base station chip U5 is connected to the SSEL pin of the microprocessor U4, the IRQ pin of the RF base station chip U5 is connected to the TXD2 pin of the microprocessor U4, the PDOWN pin of the RF base station chip U5 is connected to the RTS1 pin of the microprocessor U4, the RXP pin of the RF base station chip U5, the capacitor One end of C10, one end of the resistor R18, one end of the inductor L1 and one end of the capacitor C13 are connected respectively, the other end of the capacitor C13 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to the 1IN pin of the connector J4, the TX1 pin of the RF base station chip U5, one end of the resistor R16 and the other end of the capacitor C10 are connected respectively, the TVss pin of the RF base station chip U5, the other end of the resistor R16, one end of the resistor R17, the other end of the resistor R18 and one end of the resistor R19 are all grounded, the TX2 pin of the RF base station chip U5, the other end of the resistor R17 and the inductor L1 are connected to the ground. The RF base station chip U5 is connected to one end of the RXN pin, the other end of the capacitor C11, the other end of the resistor R19, the other end of the inductor L1, and one end of the capacitor C12 are connected respectively, the other end of the capacitor C12 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the 2IN pin of the connector J4, the IF0 pin of the RF base station chip U6 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U6 is connected to the SCK pin of the microprocessor U4, and the IF2 pin of the RF base station chip U6 is connected to the MISO pin of the microprocessor U4. The IF3 / SDA pin of the RF base station chip U6 is connected to the TD1 pin of the microprocessor U4, the IRQ pin of the RF base station chip U6 is connected to the TRACECLK pin of the microprocessor U4, the PDOWN pin of the RF base station chip U6 is connected to the TRACEDATA[0] pin of the microprocessor U4, the RXP pin of the RF base station chip U6, one end of the capacitor C14, one end of the resistor R25, one end of the inductor L2 and one end of the capacitor C16 are respectively connected, the other end of the capacitor C16 is connected to one end of the resistor R26, and the other end of the resistor R26 is connected to the 3IN pin of the connector J4,The TX1 pin of the RF base station chip U6, one end of the resistor R22, and the other end of the capacitor C14 are connected respectively, the TVss pin of the RF base station chip U6, the other end of the resistor R22, one end of the resistor R23, the other end of the resistor R25, and one end of the resistor R24 ​​are all grounded, the TX2 pin of the RF base station chip U6, the other end of the resistor R23, and one end of the capacitor C15 are connected respectively, the RXN pin of the RF base station chip U6, the other end of the capacitor C15, the other end of the resistor R24, the other end of the inductor L2, and one end of the capacitor C17 are connected respectively, the other end of the capacitor C17 is connected to one end of the resistor R27, the other end of the resistor R27 is connected to the 4IN pin of the connector J4, and the GND pin of the connector J4 is grounded. ,

[0025] In some embodiments of the present application, the power circuit includes a power chip U7, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29 and a capacitor C30;

[0026] The Vin pin of the power chip U7 is connected to one end of the capacitor C18 and one end of the capacitor C19, respectively, and the Vin pin of the power chip U7, one end of the capacitor C18, and one end of the capacitor C19 are electrically connected to the +5V power supply, respectively, and the Vout1 pin of the power chip U7 is connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, and one end of the capacitor C26. One end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C29 and one end of the capacitor C30 are connected, and the Vout2 pin of the power chip U7 is respectively connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, one end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C30. One end of capacitor C29 is connected to one end of capacitor C30, and the Vout1 pin, Vout2 pin of the power chip U7, one end of capacitor C20, one end of capacitor C21, one end of capacitor C22, one end of capacitor C23, one end of capacitor C24, one end of capacitor C25, one end of capacitor C26, one end of capacitor C27, one end of capacitor C28, one end of capacitor C29, and one end of capacitor C30 are respectively connected to the power supply VDD Electrically connected, the GND pin of the power chip U7, the other end of the capacitor C18, the other end of the capacitor C19, the other end of the capacitor C20, the other end of the capacitor C21, the other end of the capacitor C22, the other end of the capacitor C23, the other end of the capacitor C24, the other end of the capacitor C25, the other end of the capacitor C26, the other end of the capacitor C27, the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all grounded.

[0027] In a second aspect, according to an embodiment of the present application, a multifunctional document recognition device is provided, comprising: two photosensors and the multifunctional document recognition circuit described in the first aspect.

[0028] The multifunctional certificate recognition circuit and the multifunctional certificate recognition device in the embodiments of the present application solve the problem of failure of QR code or barcode recognition caused by automatic triggering of NFC of the electronic device during the recognition process of the certificate recognition device in the prior art, thereby improving the recognition success rate of the certificate recognition device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A block diagram of a multifunctional document recognition circuit provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the circuit principle of a sensor signal output circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the circuit principle of a sensor signal enhancement circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the circuit principle of a sensor signal processing circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the circuit principle of a control and data processing circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the circuit principle of a radio frequency transceiver circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the circuit principle of a power supply circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0037] Figure 8 A schematic diagram of the circuit principle of a USB interface circuit in a multifunctional document recognition circuit provided in an embodiment of the present application;

[0038] Fig. 9 A schematic diagram of the circuit principle of a warning light circuit in a multifunctional document recognition circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0040] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a series of structures are included, which is not limited to the listed structures, but may optionally include structures not listed, or may optionally include other components inherent to these structures.

[0041] The embodiment of the present application discloses a multifunctional document recognition circuit, which is applied to a document recognition device, and the document recognition device is provided with two photosensitive sensors for detecting the identification element to be tested, so as to solve the problem of failure of two-dimensional code or barcode recognition caused by automatic triggering of NFC of an electronic device in the recognition process of the document recognition device in the prior art by using the photosensitive sensors and the multifunctional document recognition circuit of the present application. The following are detailed descriptions respectively.

[0042] Figure 1 A multifunctional document recognition circuit provided according to an embodiment of the present application is shown. Figure 1 As shown, the multifunctional document recognition circuit mainly includes: a sensor signal output circuit 1, a sensor signal enhancement circuit 2, a sensor signal processing circuit 3, a control and data processing circuit 4, a radio frequency transceiver circuit 5 and a power supply circuit 6. Specifically, the output end of the sensor signal output circuit 1 is electrically connected to the input end of the sensor signal enhancement circuit 2, the output end of the sensor signal enhancement circuit 2 is electrically connected to the input end of the sensor signal processing circuit 3, the output end of the sensor signal processing circuit 3 is electrically connected to the input end of the control and data processing circuit 4, and at the same time, the radio frequency transceiver circuit 5 is electrically connected to the control and data processing circuit 4, and the power supply circuit 6 is electrically connected to the control and data processing circuit 4. Among them, the sensor signal output circuit 1 is used to detect changes in ambient light using a photosensor, and generate a sensor output signal according to the changes in ambient light; the sensor signal enhancement circuit 2 is used to enhance the sensor output signal transmitted by the sensor signal output circuit 1; the sensor signal processing circuit 3 is used to process the sensor output signal after signal enhancement to generate a sensor digital signal; the control and data processing circuit 4 is used to receive the sensor digital signal transmitted by the sensor signal processing circuit 3, and perform logical judgment on the sensor digital signal to generate a radio frequency control signal; the radio frequency transceiver circuit 5 is used to receive the radio frequency control signal transmitted by the control and data processing circuit 4, and control the opening or closing of the radio frequency antenna according to the radio frequency control signal; the power supply circuit 6 is mainly used to provide power for the entire circuit system.

[0043] When a certificate or paper barcode or QR code is placed in the certificate recognition device, the photosensitive sensor is blocked and the ambient light becomes dark. The sensor signal output circuit 1 generates and outputs a sensor output signal indicating that a certificate has been placed in the device, and the sensor signal enhancement circuit 2 and the sensor signal processing circuit 3 perform signal enhancement and signal processing in turn, and then transmit the signal to the control and data processing circuit 4. The control and data processing circuit 4 determines that a certificate has been placed in the device based on the received signal, and then generates a radio frequency control signal for turning on the radio frequency antenna, and sends the signal to the radio frequency transceiver circuit 5 to turn on the radio frequency antenna, thereby timely reading the relevant information stored in the electronic certificate. When an electronic device with NFC function (including but not limited to) is identified, When a QR code or barcode on a mobile phone is placed, the camera can effectively recognize the QR code or barcode on the electronic device without being close to the device because the screen of the electronic device has its own brightness. At this time, the ambient light brightness around the photosensitive sensor does not change significantly, so it will not be detected by the photosensitive sensor. The sensor signal output circuit 1 generates and outputs the sensor output signal of the document without being placed, and the sensor signal enhancement circuit 2 and the sensor signal processing circuit 3 perform signal enhancement and signal processing in turn, and then transmit it to the control and data processing circuit 4. The control and data processing circuit 4 determines that there is no document placed according to the received signal, and then generates a radio frequency control signal to turn off the radio frequency antenna, and sends it to the radio frequency transceiver circuit 5 to ensure that the radio frequency antenna is in a closed state. Therefore, when recognizing a document or a paper barcode or QR code, the multifunctional document recognition circuit controls the radio frequency antenna to turn on, and the document recognition device performs recognition and information reading work normally. When recognizing a QR code or barcode on an electronic device with an NFC function, the radio frequency antenna in the document recognition device always remains in a closed state, and will not actively trigger the opening of the NFC interface of the electronic device, thereby avoiding the problem of recognition failure caused by the QR code or barcode displayed on the screen of the electronic device being covered by the NFC interface. It should be noted that when the document recognition device in this application is in idle state, the antenna is in off state.

[0044] In some embodiments, Figure 2As shown, the sensor signal output circuit includes a photosensitive sensor U1, a photosensitive sensor U2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and a connector J2. In detail, the power supply end of the photosensitive sensor U1 is respectively connected to one end of the capacitor C4 and the power supply VDD, and the other end of the capacitor C4 is grounded. The output end of the photosensitive sensor U1 is respectively connected to one end of the resistor R3, one end of the capacitor C3, and the 1IN pin of the connector J2, and the other end of the resistor R3 and the other end of the capacitor C3 are grounded. The GND pin of the connector J2 is grounded, and the VDD pin of the connector J2 is electrically connected to the power supply VDD. The power supply end of the photosensitive sensor U2 is respectively connected to one end of the capacitor C5 and the power supply VDD, and the other end of the capacitor C5 is grounded. The output end of the photosensitive sensor U2 is respectively connected to one end of the resistor R4, one end of the capacitor C6, and the 2IN pin of the connector J2, and the other end of the resistor R4 and the other end of the capacitor C6 are grounded. Resistor R3 and capacitor C3 are connected to the output end of photosensor U1, so that the output signal of photosensor U1 is converted from a pulse current signal to a stable analog voltage signal; similarly, resistor R4 and capacitor C6 are connected to the output end of photosensor U2, so that the output signal of photosensor U2 is converted from a pulse current signal to a stable analog voltage signal. The generated analog voltage signal is the sensor output signal, which is transmitted to the sensor signal enhancement circuit by connector J2.

[0045] In other embodiments, Figure 3As shown, the sensor signal enhancement circuit includes a connector J3, a resistor R5, a resistor R6, a capacitor C7 and a capacitor C8. In detail, the 1OUT pin of the connector J3 is respectively connected to one end of the resistor R5, one end of the capacitor C7 and the sensor output signal GM1, the other end of the resistor R5 and the other end of the capacitor C7 are respectively grounded, the GND pin of the connector J3 is grounded, the VDD pin of the connector J3 is electrically connected to the power supply VDD, the 2OUT pin of the connector J3 is respectively connected to one end of the resistor R6, one end of the capacitor C8 and the sensor output signal GM2, the other end of the resistor R6 and the other end of the capacitor C8 are respectively grounded. The connector J2 in the sensor signal output circuit 1 is connected to the connector J3 in the sensor signal enhancement circuit 2, the resistor R5 and the capacitor C7 are connected to the photosensitive sensor U1 through the connector J3 and the connector J2, and the resistor R6 and the capacitor C8 are connected to the photosensitive sensor U2 through the connector J3 and the connector J2. In the sensor signal enhancement circuit, the resistors (i.e., resistor R5 and resistor R6) and capacitors (i.e., capacitor C7 and capacitor C8) are connected to the sensor output signal at one end and grounded at the other end, respectively acting on the two sensor output signals. After the two sensor output signals pass through the sensor signal enhancement circuit, the signal strength and stability are effectively enhanced. Among them, the maximum value of the output signal of the photosensor U1 can be adjusted by adjusting the size of the resistor R5, and the maximum value of the output signal of the photosensor U2 can also be adjusted by adjusting the size of the resistor R6. It should be noted that the maximum values ​​of the output signals of the photosensors U1 and U2 must match the level logic standard of the microprocessor U4 in the control and data processing circuit to ensure that the microprocessor U4 can correctly identify the sensor output signal.

[0046] In the present application, the main function of the sensor signal processing circuit is to perform digital shaping processing on the output signals of the two sensors, so that the sensor output signals are converted from analog signals to digital signals, and then the processed sensor output signals are transmitted to the microprocessor U4 in the control and data processing circuit for logical judgment. In some embodiments, Figure 4As shown, the sensor signal processing circuit includes a dual-channel integrated operational amplifier U3, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12. In detail, the 1IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R7 is electrically connected to the power supply VDD, and the other end of the resistor R8 is grounded, the 1IN+ pin of the dual-channel integrated operational amplifier U3 is connected to the sensor output signal GM1, the 2IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R11 and one end of the resistor R12, the other end of the resistor R11 is electrically connected to the power supply VDD, and the other end of the resistor R12 is grounded, the 2IN+ pin of the dual-channel integrated operational amplifier U3 is connected to the sensor output signal GM2, the GND pin of the dual-channel integrated operational amplifier U3 is grounded, the VCC pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is electrically connected to the power supply VDD, and the other end of the resistor R10 is electrically connected to the +5V power supply, the 1OUT pin of the dual-channel integrated operational amplifier U3 is connected to the sensor digital signal GM1_COM, and the 2OUT pin of the dual-channel integrated operational amplifier U3 is connected to the sensor digital signal GM2_COM. Among them, in the sensor signal processing circuit, the logic threshold of the output signal of the photosensor U1 can be set by adjusting the size of the resistors R7 and R8. Similarly, the logic threshold of the output signal of the photosensor U2 can be set by adjusting the size of the resistors R11 and R12. Since the size of the logic threshold determines the sensitivity of the photosensor to changes in the light environment, the sensitivity of the photosensor U1 and the photosensor U2 can be set respectively through the sensor signal processing circuit.

[0047] In other embodiments, Figure 5 As shown, the control and data processing circuit includes a microprocessor U4, a resistor R13, a resistor R14, a resistor R15 and a capacitor C9. In detail, the AD0[5] pin of the microprocessor U4 is connected to the sensor digital signal GM1_COM through the resistor R13, and the AD0[4] pin of the microprocessor U4 is connected to the sensor digital signal GM2_COM through the resistor R14, so as to receive the digital signal transmitted by the sensor signal processing circuit through the AD0[5] pin and the AD0[4] pin of the microprocessor U4. The RESET pin of the microprocessor U4 is respectively connected to one end of the resistor R15 and one end of the capacitor C9, the other end of the resistor R15 is electrically connected to the power supply VDD, and the other end of the capacitor C9 is grounded. The reset function of the microprocessor U4 is realized by the resistor R15 and the capacitor C9. When the RESET pin of the microprocessor U4 receives a valid reset signal, the microprocessor U4 will be restored to the initial state. In the specific implementation process, the microprocessor U4 uses the LPC1758 chip for data processing, transmission and antenna control.

[0048] In the present application, the RF transceiver circuit includes two RF function modules, which are respectively used to control two RF antennas. Figure 6As shown, the RF transceiver circuit includes an RF base station chip U5, an RF base station chip U6, a connector J4, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, an inductor L1 and an inductor L2. Among them, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, capacitor C10, capacitor C11, capacitor C12, capacitor C13 and inductor L1 constitute the impedance matching network of the RF base station chip U5, and resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, capacitor C14, capacitor C15, capacitor C16, capacitor C17 and inductor L2 constitute the impedance matching network of the RF base station chip U6. In detail, the IF0 pin of the RF base station chip U5 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U5 is connected to the SCK pin of the microprocessor U4, the IF2 pin of the RF base station chip U5 is connected to the MISO pin of the microprocessor U4, the IF3 / SDA pin of the RF base station chip U5 is connected to the SSEL pin of the microprocessor U4, the IRQ pin of the RF base station chip U5 is connected to the TXD2 pin of the microprocessor U4, the PDOWN pin of the RF base station chip U5 is connected to the RTS1 pin of the microprocessor U4, the RXP pin of the RF base station chip U5, one end of the capacitor C10, one end of the resistor R18, one end of the inductor L1 and one end of the capacitor C13 are respectively connected, and the other end of the capacitor C13 is connected to the resistor R 20 is connected, the other end of the resistor R20 is connected to the 1IN pin of the connector J4, the TX1 pin of the RF base station chip U5, one end of the resistor R16, and the other end of the capacitor C10 are respectively connected, the TVss pin of the RF base station chip U5, the other end of the resistor R16, one end of the resistor R17, the other end of the resistor R18, and one end of the resistor R19 are all grounded, the TX2 pin of the RF base station chip U5, the other end of the resistor R17, and one end of the capacitor C11 are respectively connected, the RXN pin of the RF base station chip U5, the other end of the capacitor C11, the other end of the resistor R19, the other end of the inductor L1, and one end of the capacitor C12 are respectively connected, the other end of the capacitor C12 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the 2IN pin of the connector J4;The IF0 pin of the RF base station chip U6 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U6 is connected to the SCK pin of the microprocessor U4, the IF2 pin of the RF base station chip U6 is connected to the MISO pin of the microprocessor U4, the IF3 / SDA pin of the RF base station chip U6 is connected to the TD1 pin of the microprocessor U4, the IRQ pin of the RF base station chip U6 is connected to the TRACECLK pin of the microprocessor U4, the PDOWN pin of the RF base station chip U6 is connected to the TRACEDATA[0] pin of the microprocessor U4, the RXP pin of the RF base station chip U6, one end of the capacitor C14, one end of the resistor R25, one end of the inductor L2 and one end of the capacitor C16 are respectively connected, and the other end of the capacitor C16 is connected to the resistor R26. One end is connected, the other end of resistor R26 is connected to the 3IN pin of connector J4, the TX1 pin of RF base station chip U6, one end of resistor R22, and the other end of capacitor C14 are respectively connected, the TVss pin of RF base station chip U6, the other end of resistor R22, one end of resistor R23, the other end of resistor R25, and one end of resistor R24 ​​are all grounded, the TX2 pin of RF base station chip U6, the other end of resistor R23, and one end of capacitor C15 are respectively connected, the RXN pin of RF base station chip U6, the other end of capacitor C15, the other end of resistor R24, the other end of inductor L2, and one end of capacitor C17 are respectively connected, the other end of capacitor C17 is connected to one end of resistor R27, the other end of resistor R27 is connected to the 4IN pin of connector J4, and the GND pin of connector J4 is grounded. The RF transceiver circuit is connected to the RF antenna of the certificate recognition device through the connector J4. The RF base station chip U5 and the RF base station chip U6 respectively control the corresponding RF antenna switch and interact with the information machine of the RF certificate according to the RF control signal transmitted by the microprocessor U4.

[0049] It should be noted that in this application, the AD0[5] pin of the microprocessor U4 refers to Figure 5 The P1

[31] / SCK1 / AD0[5] pin of the microprocessor U4 and the AD0[4] pin of the microprocessor U4 refer to Figure 5 The P1

[30] / VBUS / AD0[4] pin of the microprocessor U4, the MOSI pin of the microprocessor U4 refers to Figure 5 The P0

[18] / DCD1 / MOSI0 / MOSI pin of the microprocessor U4 in the figure, and the SCK pin of the microprocessor U4 refer to Figure 5 The P0

[15] / TXD1 / SCK0 / SCK pin of the microprocessor U4 in the figure, and the MISO pin of the microprocessor U4 refer to Figure 5The P0

[17] / CTS1 / MISO0 / MISO pin of the microprocessor U4 in the figure, the SSEL pin of the microprocessor U4 refers to Figure 5 The P0

[16] / RXD1 / SSEL0 / SSEL pin of the microprocessor U4 and the TXD2 pin of the microprocessor U4 refer to Figure 5 The P2[8] / TD2 / TXD2 pin of the microprocessor U4 and the RTS1 pin of the microprocessor U4 refer to Figure 5 The P2[7] / RD2 / RTS1 pin of the microprocessor U4 and the TD1 pin of the microprocessor U4 refer to Figure 5 The P0

[22] / RTS1 / TD1 pin of the microprocessor U4 in FIG. 1 and the TRACECLK pin of the microprocessor U4 refer to Figure 5 The P2[6] / PCAP1[0] / RI1 / TRACECLK pin of the microprocessor U4 and the TRACEDATA[0] pin of the microprocessor U4 refer to Figure 5 The P2[5] / PWM1[6] / DTR1 / TRACEDATA[0] pin of the microprocessor U4.

[0050] In other embodiments, Figure 7As shown, the power supply circuit includes a power supply chip U7, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29 and a capacitor C30. In detail, the Vin pin of the power chip U7 is respectively connected to one end of the capacitor C18 and one end of the capacitor C19, and the Vin pin of the power chip U7, one end of the capacitor C18, and one end of the capacitor C19 are respectively electrically connected to the +5V power supply, the Vout1 pin of the power chip U7 is respectively connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, one end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C29 and one end of the capacitor C30, the Vout2 pin of the power chip U7 is respectively connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, one end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C29 and one end of the capacitor C30. One end of capacitor C29 is connected to one end of capacitor C30, and the Vout1 pin, Vout2 pin of the power chip U7 and one end of capacitor C20, one end of capacitor C21, one end of capacitor C22, one end of capacitor C23, one end of capacitor C24, one end of capacitor C25, one end of capacitor C26, one end of capacitor C27, one end of capacitor C28, one end of capacitor C29, and one end of capacitor C30 are respectively electrically connected to the power supply VDD, and the GND pin of the power chip U7, the other end of capacitor C18, the other end of capacitor C19, the other end of capacitor C20, the other end of capacitor C21, the other end of capacitor C22, the other end of capacitor C23, the other end of capacitor C24, the other end of capacitor C25, the other end of capacitor C26, the other end of capacitor C27, the other end of capacitor C28, the other end of capacitor C29, and the other end of capacitor C30 are all grounded. Among them, the main function of the power chip U7 is to step down the DC voltage, and capacitors C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 and C30 mainly play the role of voltage stabilization and filtering, thereby powering the entire circuit system through the power circuit.

[0051] In the embodiments of the present application, Figure 1 As shown, the multifunctional document recognition circuit also includes a USB interface circuit 7, which is electrically connected to the control and data processing circuit 4. Its main function is to provide 5V voltage for the entire circuit system and to exchange data and commands with the host computer. Figure 8As shown, the USB interface circuit 7 includes a connector J1, a capacitor C1, a capacitor C2, a magnetic bead FB1, a resistor R1 and a resistor R2, wherein the GND pin of the connector J1 is grounded, the DP pin of the connector J1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the USB_DP signal, the DN pin of the connector J1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the USB_DN signal, the Vbus pin of the connector J1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, one end of the magnetic bead FB1, and the voltage bus power supply VBUS, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and the other end of the magnetic bead FB1 is electrically connected to the +5V power supply. In addition, it should be noted that the DN pin of the connector J1 is connected to the P0

[30] / USB_D- pin of the microprocessor U4 through the resistor R1, and the DP pin of the connector J1 is connected to the P0

[29] / USB_D+ pin of the microprocessor U4 through the resistor R2.

[0052] Furthermore, the multifunctional document recognition circuit in the embodiment of the present application also includes a prompt light circuit, such as Fig. 9 As shown, the warning light circuit includes a light emitting diode LED1, a light emitting diode LED2, a resistor R28 and a resistor R29. Specifically, the cathode of the light emitting diode LED1 is connected to the P1

[29] / MCOB2 / PCAP1[1] / MATO[1] pin of the microprocessor U4, the anode of the light emitting diode LED1 is connected to one end of the resistor R28, the cathode of the light emitting diode LED2 is connected to the P1

[28] / MCOA2 / PCAP1[0] / MATO[0] pin of the microprocessor U4, the anode of the light emitting diode LED2 is connected to one end of the resistor R29, and the other end of the resistor R28 and the other end of the resistor R29 are respectively connected to the power supply VDD. The light emitting diode LED1 and the light emitting diode LED2 emit light according to the signal transmitted by the microprocessor U4 to play the role of prompting the working status of the equipment.

[0053] The above is an introduction to the various circuits of the multifunctional document recognition circuit provided in this embodiment and the connection relationship between them. Figure 1 – Fig. 9 , the working principle of the multifunctional document recognition circuit is described in detail.

[0054] In this embodiment, when there is no obstruction above the photosensitive sensor, the sensor output signal is high level (logic "1"). When any photosensitive sensor is blocked within a certain distance (the distance depends on the sensor sensitivity setting), the sensor output signal is finally output low level (logic "0") after passing through the sensor signal enhancement circuit 2 and the sensor signal processing circuit 3. The microprocessor U4 in the control and data processing circuit 4 receives the logic "0" signal output by any photosensitive sensor, that is, it is determined that a certificate is put in, and the radio frequency antenna is immediately turned on to perform radio frequency card reading on the certificate. When identifying the QR code or barcode on an electronic device with NFC function, due to the brightness of the electronic device screen, the electronic device can be effectively identified at a long distance above the photosensitive sensor, so it will not be sensed by the photosensitive sensor. At this time, the photosensitive sensor still outputs a high level (logic "1"), and the microprocessor U4 receives the high level signal output by the photosensitive sensor, and controls the radio frequency antenna to be in a closed state, which can ensure that the NFC on the electronic device will not be triggered. In addition, to ensure that the electronic information on the certificate can be read in a timely and effective manner, the multifunctional certificate recognition circuit uses dual sensors, which are evenly distributed in the card-to-be-read area, so that no matter how the certificate is placed in the card-to-be-read area, it can be detected by at least one sensor. As long as one photosensitive sensor detects that a certificate has been placed in, the microprocessor U4 will immediately turn on the radio frequency antenna to read the certificate information.

[0055] The embodiment of the present application also provides a multifunctional document recognition device, including: two photosensors and the multifunctional document recognition circuit provided in the above embodiment, using the photosensors and the multifunctional document recognition circuit to solve the problem of failure of two-dimensional code or barcode recognition caused by automatic triggering of NFC of electronic device in the recognition process of document recognition device in the prior art. The structure, working principle and technical effect of the multifunctional document recognition circuit are the same as those of the above multifunctional document recognition circuit embodiment. For the sake of brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding contents in the above multifunctional document recognition circuit embodiment.

[0056] In summary, the present application discloses a multifunctional document recognition circuit and a multifunctional document recognition device, which solves the problem of failure of QR code or barcode recognition caused by automatic triggering of NFC of an electronic device during the recognition process of the document recognition device in the prior art, and improves the recognition success rate of the document recognition device.

[0057] Those skilled in the art will understand that the drawings are only schematic diagrams of an embodiment, and the components in the drawings are not necessarily necessary for implementing the present invention. It should also be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0059] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope described in the claims.

Claims

1. A multifunctional document recognition circuit, characterized in that: include: A sensor signal output circuit, used for detecting changes in ambient light and generating a sensor output signal; a sensor signal enhancement circuit, wherein the output end of the sensor signal output circuit is electrically connected to the input end of the sensor signal enhancement circuit, and the sensor signal enhancement circuit is used to enhance the sensor output signal transmitted by the sensor signal output circuit; A sensor signal processing circuit, wherein the output end of the sensor signal enhancement circuit is electrically connected to the input end of the sensor signal processing circuit, and the sensor signal processing circuit is used to perform signal processing on the sensor output signal after signal enhancement to generate a sensor digital signal; A control and data processing circuit, wherein the output end of the sensor signal processing circuit is electrically connected to the input end of the control and data processing circuit, and the control and data processing circuit is used to receive the sensor digital signal transmitted by the sensor signal processing circuit, and perform logic judgment on the sensor digital signal to generate a radio frequency control signal; A radio frequency transceiver circuit, the radio frequency transceiver circuit is electrically connected to the control and data processing circuit, the radio frequency transceiver circuit is used to receive the radio frequency control signal transmitted by the control and data processing circuit, and control the opening or closing of the radio frequency antenna according to the radio frequency control signal; The power supply circuit is electrically connected to the control and data processing circuit and is used to provide power.

2. The multifunctional document recognition circuit according to claim 1, characterized in that: Also includes: A USB interface circuit is electrically connected to the control and data processing circuit.

3. The multifunctional document recognition circuit according to claim 2, characterized in that: The USB interface circuit includes a connector J1, a capacitor C1, a capacitor C2, a magnetic bead FB1, a resistor R1 and a resistor R2; The GND pin of the connector J1 is grounded, the DP pin of the connector J1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the USB_DP signal, the DN pin of the connector J1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the USB_DN signal, the Vbus pin of the connector J1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, one end of the magnetic bead FB1, and the voltage bus power supply VBUS, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and the other end of the magnetic bead FB1 is electrically connected to the +5V power supply.

4. The multifunctional document recognition circuit according to claim 1, characterized in that: The sensor signal output circuit includes a photosensitive sensor U1, a photosensitive sensor U2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and a connector J2; The power supply end of the photosensor U1 is respectively connected to one end of the capacitor C4 and the power supply VDD, and the other end of the capacitor C4 is grounded. The output end of the photosensor U1 is respectively connected to one end of the resistor R3, one end of the capacitor C3, and the 1IN pin of the connector J2, the other end of the resistor R3 and the other end of the capacitor C3 are grounded, the GND pin of the connector J2 is grounded, and the VDD pin of the connector J2 is electrically connected to the power supply VDD. The power supply end of the photosensor U2 is respectively connected to one end of the capacitor C5 and the power supply VDD, and the other end of the capacitor C5 is grounded. The output end of the photosensor U2 is respectively connected to one end of the resistor R4, one end of the capacitor C6, and the 2IN pin of the connector J2, and the other end of the resistor R4 and the other end of the capacitor C6 are grounded.

5. The multifunctional document recognition circuit according to claim 1, characterized in that: The sensor signal enhancement circuit includes a connector J3, a resistor R5, a resistor R6, a capacitor C7 and a capacitor C8; The 1OUT pin of the connector J3 is respectively connected to one end of the resistor R5, one end of the capacitor C7 and the sensor output signal GM1, the other end of the resistor R5 and the other end of the capacitor C7 are respectively grounded, the GND pin of the connector J3 is grounded, the VDD pin of the connector J3 is electrically connected to the power supply VDD, the 2OUT pin of the connector J3 is respectively connected to one end of the resistor R6, one end of the capacitor C8 and the sensor output signal GM2, the other end of the resistor R6 and the other end of the capacitor C8 are respectively grounded.

6. The multifunctional document recognition circuit according to claim 1, characterized in that: The sensor signal processing circuit includes a dual-channel integrated operational amplifier U3, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12; The 1IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R7 is electrically connected to the power supply VDD, and the other end of the resistor R8 is grounded. The 1IN+ pin of the dual-channel integrated operational amplifier U3 is connected to the sensor output signal GM1, and the 2IN- pin of the dual-channel integrated operational amplifier U3 is respectively connected to one end of the resistor R11 and one end of the resistor R12, the other end of the resistor R11 is electrically connected to the power supply VDD, and the other end of the resistor R12 is grounded. The 2IN+ pin of U3 is connected to the sensor output signal GM2, the GND pin of the dual integrated operational amplifier U3 is grounded, the VCC pin of the dual integrated operational amplifier U3 is respectively connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is electrically connected to the power supply VDD, the other end of the resistor R10 is electrically connected to the +5V power supply, the 1OUT pin of the dual integrated operational amplifier U3 is connected to the sensor digital signal GM1_COM, and the 2OUT pin of the dual integrated operational amplifier U3 is connected to the sensor digital signal GM2_COM.

7. The multifunctional document recognition circuit according to claim 1, characterized in that: The control and data processing circuit includes a microprocessor U4, a resistor R13, a resistor R14, a resistor R15 and a capacitor C9; The AD0[5] pin of the microprocessor U4 is connected to the sensor digital signal GM1_COM through the resistor R13, the AD0[4] pin of the microprocessor U4 is connected to the sensor digital signal GM2_COM through the resistor R14, the RESET pin of the microprocessor U4 is respectively connected to one end of the resistor R15 and one end of the capacitor C9, the other end of the resistor R15 is electrically connected to the power supply VDD, and the other end of the capacitor C9 is grounded; wherein, the microprocessor U4 adopts the LPC1758 chip.

8. The multifunctional document recognition circuit according to claim 7, characterized in that: The radio frequency transceiver circuit includes a radio frequency base station chip U5, a radio frequency base station chip U6, a connector J4, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, an inductor L1 and an inductor L2; The IF0 pin of the RF base station chip U5 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U5 is connected to the SCK pin of the microprocessor U4, the IF2 pin of the RF base station chip U5 is connected to the MISO pin of the microprocessor U4, the IF3 / SDA pin of the RF base station chip U5 is connected to the SSEL pin of the microprocessor U4, the IRQ pin of the RF base station chip U5 is connected to the TXD2 pin of the microprocessor U4, the PDOWN pin of the RF base station chip U5 is connected to the RTS1 pin of the microprocessor U4, the RXP pin of the RF base station chip U5, the capacitor One end of C10, one end of the resistor R18, one end of the inductor L1 and one end of the capacitor C13 are connected respectively, the other end of the capacitor C13 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to the 1IN pin of the connector J4, the TX1 pin of the RF base station chip U5, one end of the resistor R16 and the other end of the capacitor C10 are connected respectively, the TVss pin of the RF base station chip U5, the other end of the resistor R16, one end of the resistor R17, the other end of the resistor R18 and one end of the resistor R19 are all grounded, the TX2 pin of the RF base station chip U5, the other end of the resistor R17 and the inductor L1 are connected to the ground. The RF base station chip U5 is connected to one end of the RXN pin, the other end of the capacitor C11, the other end of the resistor R19, the other end of the inductor L1, and one end of the capacitor C12 are connected respectively, the other end of the capacitor C12 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the 2IN pin of the connector J4, the IF0 pin of the RF base station chip U6 is connected to the MOSI pin of the microprocessor U4, the IF1 / SCL pin of the RF base station chip U6 is connected to the SCK pin of the microprocessor U4, and the IF2 pin of the RF base station chip U6 is connected to the MISO pin of the microprocessor U4. The IF3 / SDA pin of the RF base station chip U6 is connected to the TD1 pin of the microprocessor U4, the IRQ pin of the RF base station chip U6 is connected to the TRACECLK pin of the microprocessor U4, the PDOWN pin of the RF base station chip U6 is connected to the TRACEDATA[0] pin of the microprocessor U4, the RXP pin of the RF base station chip U6, one end of the capacitor C14, one end of the resistor R25, one end of the inductor L2 and one end of the capacitor C16 are respectively connected, the other end of the capacitor C16 is connected to one end of the resistor R26, and the other end of the resistor R26 is connected to the 3IN pin of the connector J4,The TX1 pin of the RF base station chip U6, one end of the resistor R22, and the other end of the capacitor C14 are connected respectively, the TVss pin of the RF base station chip U6, the other end of the resistor R22, one end of the resistor R23, the other end of the resistor R25, and one end of the resistor R24 ​​are all grounded, the TX2 pin of the RF base station chip U6, the other end of the resistor R23, and one end of the capacitor C15 are connected respectively, the RXN pin of the RF base station chip U6, the other end of the capacitor C15, the other end of the resistor R24, the other end of the inductor L2, and one end of the capacitor C17 are connected respectively, the other end of the capacitor C17 is connected to one end of the resistor R27, the other end of the resistor R27 is connected to the 4IN pin of the connector J4, and the GND pin of the connector J4 is grounded. , 9. The multifunctional document recognition circuit according to claim 1, characterized in that: The power supply circuit includes a power supply chip U7, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29 and a capacitor C30; The Vin pin of the power chip U7 is connected to one end of the capacitor C18 and one end of the capacitor C19, respectively, and the Vin pin of the power chip U7, one end of the capacitor C18, and one end of the capacitor C19 are electrically connected to the +5V power supply, respectively, and the Vout1 pin of the power chip U7 is connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, and one end of the capacitor C26. One end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C29 and one end of the capacitor C30 are connected, and the Vout2 pin of the power chip U7 is respectively connected to one end of the capacitor C20, one end of the capacitor C21, one end of the capacitor C22, one end of the capacitor C23, one end of the capacitor C24, one end of the capacitor C25, one end of the capacitor C26, one end of the capacitor C27, one end of the capacitor C28, one end of the capacitor C30. One end of capacitor C29 is connected to one end of capacitor C30, and the Vout1 pin, Vout2 pin of the power chip U7, one end of capacitor C20, one end of capacitor C21, one end of capacitor C22, one end of capacitor C23, one end of capacitor C24, one end of capacitor C25, one end of capacitor C26, one end of capacitor C27, one end of capacitor C28, one end of capacitor C29, and one end of capacitor C30 are respectively connected to the power supply VDD Electrically connected, the GND pin of the power chip U7, the other end of the capacitor C18, the other end of the capacitor C19, the other end of the capacitor C20, the other end of the capacitor C21, the other end of the capacitor C22, the other end of the capacitor C23, the other end of the capacitor C24, the other end of the capacitor C25, the other end of the capacitor C26, the other end of the capacitor C27, the other end of the capacitor C28, the other end of the capacitor C29 and the other end of the capacitor C30 are all grounded.

10. A multifunctional document recognition device, characterized in that: include: Two photosensors and the multifunctional document recognition circuit according to any one of claims 1-9.

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