CN210402358U - Radio frequency card identification circuit suitable for robot - Google Patents
Radio frequency card identification circuit suitable for robot Download PDFInfo
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- CN210402358U CN210402358U CN201921559183.5U CN201921559183U CN210402358U CN 210402358 U CN210402358 U CN 210402358U CN 201921559183 U CN201921559183 U CN 201921559183U CN 210402358 U CN210402358 U CN 210402358U
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Abstract
A radio frequency card identification circuit suitable for a robot comprises a carrier drive module, a receiving and transmitting module, a filtering module, an operational amplifier module and a main control module. The main control module outputs a carrier signal to the carrier driving module, the carrier driving module reinforces the carrier signal and then outputs a reinforced carrier signal, the transceiver module radiates the reinforced carrier signal to the environment, and the radio frequency card in the radiation area is triggered to transmit a label signal outwards; the receiving and sending module receives the label signal and then outputs the label signal to the filtering module, the filtering module filters the enhanced carrier signal mixed in the label signal and then outputs the label signal to the operational amplifier module, the operational amplifier module amplifies the label signal and then outputs the amplified label signal to the main control module, and the main control module correspondingly executes an instruction in the label signal. The radio frequency card identification circuit is simple in structure and easy to maintain, can be widely used in the field of robots, is used for the robots to perform radio frequency identification, and solves the problems of high maintenance difficulty and high cost in the traditional chip-packaged reader technology.
Description
Technical Field
The utility model belongs to the technical field of the robot, especially, relate to a radio frequency card identification circuit suitable for robot.
Background
As the application of the robot to work and life of people is more and more extensive, a technology of enabling the robot to receive and transmit signals to complete operations such as scene recognition, motion mode selection, mode setting and the like by using a radio frequency technology is also more and more important. However, in the reader for identifying the radio frequency card in the market at present, the circuit of the reader is packaged by a chip, and when the chip fails, the difficulty of disassembling and maintaining is high, and the radio frequency chip is complex in design, high in chip manufacturing cost and difficult to popularize.
Therefore, the problems of high maintenance difficulty and high cost exist in the traditional reader technical scheme adopting chip packaging.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a radio frequency card identification circuit suitable for robot aims at solving consequently, has the problem that the maintenance degree of difficulty is big, with high costs among the traditional reader technical scheme that adopts chip package
The utility model discloses the first aspect of the embodiment provides a radio frequency card identification circuit suitable for robot, include:
the carrier driving module is used for outputting a reinforced carrier signal after amplifying the received carrier signal;
the receiving and sending module is connected with the carrier driving module and used for receiving the enhanced carrier signal and radiating the enhanced carrier signal to a surrounding preset area so as to charge and trigger the radio frequency card in the preset area and receive a label signal fed back after the radio frequency card is triggered;
the filtering module is connected with the transceiving module and used for filtering a mixed signal formed by mixing the label signal and the carrier signal so as to filter the carrier signal in the mixed signal;
the operational amplifier module is connected with the filtering module and is used for receiving the label signal and carrying out amplification processing and voltage stabilization processing on the label signal; and
and the main control module is connected with the carrier drive module and the operational amplifier module and is used for generating and outputting the carrier signal to the carrier drive module and receiving the label signal after amplification processing and voltage stabilization processing so as to execute the instruction contained in the label signal.
According to the radio frequency card identification circuit suitable for the robot, the reinforced carrier signals are radiated to the surrounding preset area through the transceiving module, so that the radio frequency card in the preset area is charged and triggered, the tag signals fed back after the radio frequency card is triggered are received, the filtering module filters the mixed frequency signals formed by mixing the tag signals and the reinforced carrier signals to filter the reinforced carrier signals in the mixed frequency signals, the tag signals are amplified by the operational amplifier module and then output to the main control module, and the main control module correspondingly executes instructions in the tag signals. The radio frequency card identification circuit is simple in structure and easy to maintain, can be widely used in the field of robots, is used for the robots to perform radio frequency identification, and solves the problems of high maintenance difficulty and high cost in the traditional chip-packaged reader technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a radio frequency card identification circuit suitable for a robot according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radio frequency card identification circuit suitable for a robot according to another embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of the RFID circuit of FIG. 1 or FIG. 2;
FIG. 4 is a schematic circuit diagram of a main control module in the RFID circuit shown in FIG. 1 or FIG. 2;
fig. 5 is a schematic circuit diagram of a crystal oscillator module in the rfid circuit shown in fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a radio frequency card identification circuit suitable for a robot according to an embodiment of the present invention, which only shows parts related to the embodiment for convenience of description, and the details are as follows:
a radio frequency card identification circuit suitable for a robot comprises a main control module 10, a carrier drive module 20, a transceiver module 30, a filter module 40, an operational amplifier module 50 and the main control module 10.
The main control module 10 is connected to the carrier driving module 20 and the operational amplifier module 50, the transceiver module 30 is connected to the carrier driving module 20 and the filter module 40, and the filter module 40 is connected to the operational amplifier module 50.
The carrier driving module 20 is configured to amplify the received carrier signal and output an enhanced carrier signal. Specifically, the carrier driving module 20 is implemented by a push-pull power amplifying circuit, which performs power amplification on a carrier signal, and includes a pair of complementary symmetric tubes, which may be implemented by bipolar junction transistors, metal-oxide-semiconductor field effect transistors, or triodes.
Optionally, the carrier driving module 20 may also be implemented by using a power amplifier.
Optionally, the frequency of the enhanced carrier signal is 125 KHz.
The transceiver module 30 is configured to receive a reinforced carrier signal, radiate the reinforced carrier signal to a surrounding preset area, charge and trigger a radio frequency card in the preset area, and receive a tag signal fed back after the radio frequency card is triggered.
Specifically, the tag signal includes specific instructions, which include, but are not limited to, a scene switching instruction, an action execution instruction, and an operation mode selection instruction. For example, if the tag signal fed back by the radio frequency card a contains a home instruction, the robot switches scenes after receiving the instruction and switches the mode to a home mode; if the label signal fed back by the B radio frequency card contains a dancing instruction, the robot performs switching after receiving the instruction, and performs dancing.
The range of the preset area is a spherical range taking the robot as a center, and the radius of the preset area is 0-300 m. The rf cards in the preset area generate electromagnetic induction after receiving the carrier driving signal, are charged and triggered, and feed back the tag signal to the transceiver module 30.
Both the carrier driving signal and the tag signal propagate in the air medium or the water medium or other medium where the robot is located in the form of electromagnetic waves, so the tag signal fed back to the transceiver module 30 is mixed with the enhanced carrier signal, and a signal obtained by mixing the tag signal and the enhanced carrier signal is called a mixing signal. It should be noted that two signals in the mixed signal are not modulated, so that demodulation is not required, and therefore, a complex modulation circuit and a complex demodulation circuit are not required, and the circuit structure is simple.
The filtering module 40 is configured to filter the mixed signal to filter an enhanced carrier signal in the mixed signal, so as to obtain a single tag signal, and output the tag signal to the amplifying module.
Specifically, the nominal size of the detector elements and filter elements in filter module 40 is determined by the actual conditions, i.e., the type of detector elements and filter elements that are correspondingly paired according to the frequency of the emphasis carrier signal.
The operational amplifier module 50 is configured to receive the tag signal output after the filtering process performed by the filtering module 40, and perform voltage stabilization and amplification on the tag signal.
Specifically, the operational amplifier module 50 includes an operational amplifier.
The main control module 10 generates and outputs a carrier signal to the carrier driving module 20, and receives the tag signal after the amplification processing and the voltage stabilization processing to execute the instruction included in the tag signal.
Specifically, the main control module 10 is implemented by a single chip or a central processing unit. Optionally, after the tag signal absolutely received by the main control module 10 is demodulated, the instruction contained in the tag signal is read, and the robot is controlled to execute the instruction.
The rf card identification circuit for a robot radiates a reinforced carrier signal to a surrounding preset area through the transceiver module 30, so as to charge and trigger the rf card in the preset area and receive a tag signal fed back after the rf card is triggered, the filter module 40 filters a mixing signal formed by mixing the tag signal and the reinforced carrier signal to filter the reinforced carrier signal in the mixing signal, the operational amplifier module 50 amplifies the tag signal and outputs the amplified tag signal to the main control module 10, and the main control module 10 executes an instruction in the tag signal accordingly. The radio frequency card identification circuit is simple in structure and easy to maintain, can be widely used in the field of robots, is used for the robots to perform radio frequency identification, and solves the problems of high maintenance difficulty and high cost in the traditional chip-packaged reader technology.
Fig. 2 is a schematic structural diagram of a radio frequency card identification circuit suitable for a robot according to another embodiment of the present invention, which only shows parts related to the embodiment for convenience of description, and the details are as follows:
in an optional embodiment, the above-mentioned rfid circuit further includes a crystal module 60.
The crystal oscillator module 60 is connected to the main control module 10, and is configured to generate and output a clock signal to drive the main control module 10 to operate.
Specifically, the oscillation frequency of the crystal oscillator Y1 in the crystal oscillation module 60 is 8 MHz.
Fig. 3 is a schematic circuit diagram of the rfid circuit shown in fig. 1 or fig. 2, which only shows the parts related to the present embodiment for convenience of description, and the details are as follows:
in an alternative embodiment, the carrier driving module 20 includes a first resistor R30, a second resistor R10, an N-type transistor Q4, and a P-type transistor Q3.
The first end of the first resistor R30 and the first end of the second resistor R10 are connected with the main control module 10, the second end of the first resistor R30 and the collector of the N-type triode Q4 are connected with a working power supply VCC _ RFID, a node where the emitter of the N-type triode Q4 and the P-type triode Q3 are connected in common is connected with the transceiving module 30, and the collector of the P-type triode Q3 is grounded; the base of the N-type transistor Q4, the base of the P-type transistor Q3 and the second end of the second resistor R10 are connected in common.
Specifically, the carrier driving module 20 adopts a push-pull power amplifier circuit, and the N-type transistor Q4 and the P-type transistor Q3 are a pair of complementary symmetric transistors. In other embodiments, a bipolar junction transistor may be used, and a mosfet may be used as a complementary symmetric transistor.
In an optional embodiment, the transceiver module 30 includes a third resistor R6, a fourth resistor R7, a first capacitor C6, a second capacitor C5, an antenna interface J22, and an antenna.
A first end of the third resistor R6 and a first end of the first capacitor C6 are connected to the carrier driving module 20, a second end of the third resistor R6 is connected to a first end of the antenna interface J22, and a first end of the fourth resistor R7 and a first end of the second capacitor C5 are connected to the filtering module 40; a second end of the fourth resistor R7 is connected with a second end of the antenna interface J22; the second end of the first capacitor C6 and the second end of the second capacitor C5 are grounded; the antenna interface J22 is connected to an antenna, which is in wireless communication with the RF card.
Specifically, the antenna is used for transmitting the enhanced carrier signal to the outside and receiving the mixing signal; the first capacitor C6 and the second capacitor C5 are filter capacitors for filtering low-frequency interference signals in the enhanced carrier signal and low-frequency interference signals in the mixing signal, respectively. The antenna interface J22 is model WF 12502-03.
In an optional embodiment, the filtering module 40 includes a third capacitor C24, a fourth capacitor C25, a fifth capacitor C27, a sixth capacitor C26, a seventh capacitor C28, a fifth resistor R20, a sixth resistor R21, a seventh resistor R22, a first schottky diode D7, a second schottky diode D8, and a third schottky diode D9.
A node at which the first end of the third capacitor C24, the first end of the fourth capacitor C25 and the first end of the fifth resistor R20 are connected is connected to the transceiver module 30; a second end of the fifth resistor R20 is connected with an anode of a first Schottky diode D7, and a cathode of the first Schottky diode D7, a first end of the sixth resistor R21, a first end of a fifth capacitor C27 and a first end of a sixth capacitor C26 are connected in common; the second end of the sixth capacitor C26, the cathode of the second Schottky diode D8, the anode of the third Schottky diode D9, the first end of the seventh resistor R22 are connected in common, and the first end of the seventh capacitor C28 is connected in common; a second end of the sixth capacitor C26 is connected to the operational amplifier module 50;
the second terminal of the third capacitor C24, the second terminal of the fourth capacitor C25, the second terminal of the sixth resistor R21, the second terminal of the fifth capacitor C27, the anode of the second schottky diode D8, the cathode of the third schottky diode D9, the second terminal of the seventh resistor R22, and the second terminal of the seventh capacitor C28 are grounded.
The third capacitor C24, the fourth capacitor C25, the fifth capacitor C27, the sixth capacitor C26 and the seventh capacitor C28 are all filter capacitors. The first Schottky diode, the second Schottky diode and the third Schottky diode are used for detecting, and the Schottky diode applies rated local oscillator power to present high impedance to waves with specific frequency, for example, to present high impedance to an enhanced carrier signal with the frequency of 125KHz, so as to prevent the enhanced carrier signal from passing through.
In an optional embodiment, the operational amplifier module 50 includes an operational amplifier chip U8, an eighth resistor R24, a ninth resistor R23, a tenth resistor R25, an eleventh resistor R26, a twelfth resistor R27, a thirteenth resistor R29, a fourteenth resistor R28, and an eighth capacitor.
A first positive phase input end 1IN + of the operational amplifier chip U8 is connected with the filter module 40, a first negative phase input end 1 IN-of the operational amplifier chip U8, a first end of an eighth resistor R24 and a first end of a ninth resistor R23 are connected IN common, a second end of the eighth resistor R24 is grounded, and a second end of the ninth resistor R23, a first end of an eighth capacitor and a first output end 1OUT of the operational amplifier chip U8 are connected IN common; a second end of the eighth capacitor is commonly connected with a first end of the tenth resistor R25; the second end of the tenth resistor R25, the second non-inverting input terminal 2IN + of the operational amplifier chip U8, and the first end of the eleventh resistor R26 are connected together; the second end of the eleventh resistor R26, the second output end 2OUT of the operational amplifier chip U8 and the first end of the twelfth resistor R27 are connected in common; a second end of the twelfth resistor R27 is grounded; the second output end 2OUT of the operational amplifier chip U8 is connected to the main control module 10.
A power supply end VCC of the operational amplifier chip U8 is connected to a working power supply VCC _ RFID, a first end of a thirteenth resistor R29 is connected to the working power supply, and a first end of a fourteenth resistor R28 is grounded; the node at which the second end of the thirteenth resistor R29 and the second end of the fourteenth resistor R28 are connected is connected to the second inverting input terminal 2 IN-of the operational amplifier chip U8.
Specifically, the op-amp chip U8 includes two high-gain, independent, internal frequency compensated operational amplifiers therein. A second output end 2OUT of the operational amplifier chip U8 is connected to the main control module 10 as an output end of the operational amplifier module 50, and is configured to output the tag signal after the amplification processing and the voltage stabilization processing.
Fig. 4 is a schematic circuit diagram of the main control module 10 in the rfid circuit shown in fig. 1 or fig. 2, which only shows the relevant parts of the present embodiment for convenience of description, and the following details are described below:
in an optional embodiment, the main control module 10 is implemented by a single chip microcomputer U5 or a central processing unit. The model of the single chip microcomputer shown in FIG. 4 is STM32F070CBT 6. And a 29 th pin of the singlechip U5 is connected with a carrier drive module and used for outputting a carrier signal with the frequency of 125 KHz. And a 27 th pin of the singlechip U5 is connected with an operational amplifier module and used for receiving the label signal after voltage stabilization processing and amplification processing. The 5 th pin and the 6 th pin of the singlechip U5 are connected with the crystal oscillator module 60.
Fig. 5 is a schematic circuit diagram of the crystal oscillator module 60 in the rfid circuit shown in fig. 2, which only shows the parts related to the present embodiment for convenience of description, and the details are as follows:
in an alternative embodiment, the crystal oscillating module 60 includes a crystal oscillator Y1, a ninth capacitor C19, and a tenth capacitor C21.
The first pin 1 of the crystal oscillator Y1 is an input terminal, the second pin 2 and the fourth pin 4 are grounded, the third pin 3 is an output terminal, the first terminal of the ninth capacitor C19 is connected to the input terminal, the first terminal of the tenth capacitor C21 is connected to the output terminal, and the second terminal of the ninth capacitor C19 and the second terminal of the tenth capacitor C21 are grounded.
Specifically, the oscillation frequency of the crystal oscillator Y1 is 8 MHz.
It should be noted that both the carrier driving signal and the tag signal propagate in the air medium, the water medium, or other medium where the robot is located in the form of electromagnetic waves, so the tag signal fed back to the transceiver module 30 is mixed with the enhanced carrier signal, and a signal obtained by mixing the tag signal and the enhanced carrier signal is referred to as a mixing signal. It is worth noting that two signals in the mixed signal are not modulated, and therefore do not need to be demodulated.
To sum up, the embodiment of the utility model provides a radio frequency card identification circuit suitable for robot, will strengthen carrier signal through transceiver module and to predetermineeing the region around and radiate, thereby to being in the radio frequency card in predetermineeing the region and charging and triggering, and accept the tag signal that the radio frequency card was triggered the back feedback, filtering module filters the mixing signal that tag signal and strengthening carrier signal mix and form, with the strengthening carrier signal among the filtering mixing signal, output to host system after amplifying tag signal by fortune module again, instruction in the corresponding execution tag signal of host system. The radio frequency card identification circuit is simple in structure and easy to maintain, can be widely used in the field of robots, is used for the robots to perform radio frequency identification, and solves the problems of high maintenance difficulty and high cost in the traditional chip-packaged reader technology.
Various embodiments are described herein for various circuits. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A radio frequency card identification circuit adapted for use with a robot, comprising:
the carrier driving module is used for outputting a reinforced carrier signal after amplifying the received carrier signal;
the receiving and sending module is connected with the carrier driving module and used for receiving the enhanced carrier signal and radiating the enhanced carrier signal to a surrounding preset area so as to charge and trigger the radio frequency card in the preset area and receive a label signal fed back after the radio frequency card is triggered;
the filtering module is connected with the transceiving module and used for filtering a mixing signal formed by mixing the tag signal and the reinforced carrier signal so as to filter the reinforced carrier signal in the mixing signal;
the operational amplifier module is connected with the filtering module and is used for receiving the label signal and carrying out amplification processing and voltage stabilization processing on the label signal; and
and the main control module is connected with the carrier drive module and the operational amplifier module and is used for generating and outputting the carrier signal to the carrier drive module and receiving the label signal after amplification processing and voltage stabilization processing so as to execute the instruction contained in the label signal.
2. The radio frequency card identification circuit of claim 1, further comprising:
and the crystal oscillator module is connected with the main control module and used for generating and outputting a clock signal so as to drive the main control module to work.
3. The radio frequency card identification circuit of claim 1, wherein the carrier drive module comprises:
the circuit comprises a first resistor, a second resistor, an N-type triode and a P-type triode;
the first end of the first resistor and the first end of the second resistor are connected with the main control module, the second end of the first resistor and the collector of the N-type triode are connected with a working power supply, a node where the emitter of the N-type triode and the P-type triode are connected in common is connected with the transceiver module, and the collector of the P-type triode is grounded; and the base electrode of the N-type triode, the base electrode of the P-type triode and the second end of the second resistor are connected in common.
4. The radio frequency card identification circuit of claim 1, wherein the transceiver module comprises:
the antenna comprises a third resistor, a fourth resistor, a first capacitor, a second capacitor, an antenna interface and an antenna;
the first end of the third resistor and the first end of the first capacitor are connected with the carrier driving module, the second end of the third resistor is connected with the first end of the antenna interface, and the first end of the fourth resistor and the first end of the second capacitor are connected with the filtering module; a second end of the fourth resistor is connected with a second end of the antenna interface; the second end of the first capacitor and the second end of the second capacitor are grounded; the antenna interface is connected with the antenna, and the antenna is in wireless communication with the radio frequency card.
5. The radio frequency card identification circuit of claim 1, wherein the filtering module comprises:
the first Schottky diode is connected with the first capacitor, the second Schottky diode is connected with the second capacitor, and the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the fifth resistor, the sixth resistor, the seventh resistor, the first Schottky diode, the second Schottky diode and the third Schottky diode are connected with the first capacitor;
the first end of the third capacitor, the first end of the fourth capacitor and the first end of the fifth resistor are connected with a node in common, and the node is connected with the transceiver module; the second end of the fifth resistor is connected with the anode of the first Schottky diode, and the cathode of the first Schottky diode, the first end of the sixth resistor, the first end of the fifth capacitor and the first end of the sixth capacitor are connected in common; the second end of the sixth capacitor, the cathode of the second Schottky diode, the anode of the third Schottky diode, the first end of the seventh resistor and the first end of the seventh capacitor are connected in common; the second end of the sixth capacitor is connected with the operational amplifier module;
a second end of the third capacitor, a second end of the fourth capacitor, a second end of the sixth resistor, a second end of the fifth capacitor, an anode of the second schottky diode, a cathode of the third schottky diode, a second end of the seventh resistor, and a second end of the seventh capacitor are grounded.
6. The radio frequency card identification circuit of claim 1, wherein the operational amplifier module comprises:
the operational amplifier chip comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and an eighth capacitor;
the first positive phase input end of the operational amplifier chip is connected with the filtering module, the first negative phase input end of the operational amplifier chip, the first end of the eighth resistor and the first end of the ninth resistor are connected in common, the second end of the eighth resistor is grounded, and the second end of the ninth resistor, the first end of the eighth capacitor and the first output end of the operational amplifier chip are connected in common; a second end of the eighth capacitor is connected with a first end of the tenth resistor in common; a second end of the tenth resistor, a second positive phase input end of the operational amplifier chip and a first end of the eleventh resistor are connected in common; the second end of the eleventh resistor, the second output end of the operational amplifier chip and the first end of the twelfth resistor are connected in common; a second end of the twelfth resistor is grounded; the second output end of the operational amplifier chip is connected with the main control module;
a power supply end of the operational amplifier chip is connected with a working power supply, a first end of the thirteenth resistor is connected with the working power supply, and a first end of the fourteenth resistor is grounded; and a node where the second end of the thirteenth resistor and the second end of the fourteenth resistor are connected in common is connected with the second inverting input end of the operational amplifier chip.
7. The radio frequency card identification circuit of claim 2, wherein the main control module is implemented using a single chip microcomputer.
8. The radio frequency card identification circuit of claim 1, wherein the radio frequency card identification circuit is built into the robot.
9. The radio frequency card identification circuit of claim 1, wherein the tag signal contains instructions comprising:
the robot control system comprises an application scene switching instruction of the robot, an action execution instruction of the robot and a working mode selection instruction of the robot.
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| CN110738064A (en) * | 2019-09-17 | 2020-01-31 | 深圳市优必选科技股份有限公司 | radio frequency card identification circuit and method suitable for robot |
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| CN110738064A (en) * | 2019-09-17 | 2020-01-31 | 深圳市优必选科技股份有限公司 | radio frequency card identification circuit and method suitable for robot |
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