CN104504431A - One-way visible light based recognition passive electronic tag and reader assembly - Google Patents

Abstract

The invention discloses a one-way visible light identification passive electronic tag and a reader device. The device includes VLID electronic tags and readers. The reader is composed of a power transmission coil, a power transmission module, an ID verification module, a communication and control module, a judgment module, a power supply and a photoelectric sensor, and is used to provide energy for the VLID electronic tag, read and verify the optical information of the VLID electronic tag, And send the read information to other devices. The VLID electronic tag is composed of a power receiving coil, a power receiving module, an ID generating module, an LED driver module and an LED. It is used to receive the wireless energy of the reader, generate, store, modulate, and encode the information of the VLID electronic tag, and drive the LED to send visible light. Signal. The invention overcomes many deficiencies in the prior art, solves the power supply problem of small and micro VLC identification equipment, and has good market promotion prospect.

Description

One-way visible light identification passive electronic tag and reader device

technical field

The invention belongs to the technical field of visible light communication, and in particular relates to a one-way visible light identification passive electronic tag and a reader device.

Background technique

Visible light communication (Visible Light Communication, referred to as VLC) technology is to use light-emitting devices such as LEDs at the sending end to send out modulated visible light signals with information, and the receiving end uses photosensitive devices to receive modulated visible light signals to achieve wireless communication. This technology is a new wireless communication technology discovered in recent years. It is developed to supplement or even replace other current means, such as radio, infrared or laser communication technologies, to solve the shortcomings of these technologies. Visible light communication is different from optical communication methods such as radio, infrared or laser: radio and infrared light cannot be seen, and the direction of signal emission is not clear enough, so there is great insecurity; laser has strong directionality and is not suitable for freedom and openness At the same time, the laser consumes a lot of power, which is not suitable for low-power portable devices. In addition, radio will also produce adverse effects such as electromagnetic radiation and interference.

Radio Frequency Identification (RFID) technology uses radio frequency signals to identify specific targets and read and write related data without establishing mechanical contact between the identification system and specific targets. According to the different power supply methods, RFID tags can be divided into active tags (Active tag) and passive tags (Passive tag). Among them, the passive RFID does not have a battery inside. When it is outside the reading and writing range of the reader, the electronic tag is in a passive state; Extract the power it needs to work.

Wireless charging stems from wireless power transfer technology. Wireless charging, also known as inductive charging and non-contact inductive charging, uses near-field induction, that is, electromagnetic coupling, to transmit energy from the power supply device to the power-consuming device, and the power-consuming device uses the received energy to charge the battery or provide Powering electrical equipment.

The present invention uses visible light communication, wireless power supply and other technologies in combination to provide a one-way visible light identification passive electronic tag and reader device, which solves the important problem of the development of visible light communication equipment towards portability and miniaturization, allowing it to Like magnetic cards and various thin and light passive RFIDs, they are widely used.

Contents of the invention

The purpose of the present invention is to provide a one-way visible light identification passive electronic tag and reader device.

The present invention is realized in the following way: a passive electronic tag and reader device for one-way visible light recognition, including a VLID electronic tag and a reader, the VLID electronic tag consists of a power receiving coil, a power receiving module, an ID generating module, an LED driving module and Composed of LEDs; the reader is composed of a power transmission coil, a power transmission module, an ID verification module, a communication and control module, a judgment module, a power supply and a photoelectric sensor; among them, the power receiving coil is connected to a power receiving module, and the power receiving module is connected to an ID generating The module and the LED driver module, the ID generation module and the LED driver module are connected to each other, the LED driver module is connected to the LED, the LED corresponds to the photoelectric sensor through the visible light signal, the photoelectric sensor is set on the judgment module, and the judgment module is connected to the ID verification module , the ID verification module is connected to the communication and control module, the power transmission module is connected to the power transmission coil, and the power supply is respectively connected to the power transmission module, communication and control module, ID verification module and judgment module; the power transmission coil corresponds to the power receiving coil through wireless charging energy .

The reader is used to provide energy to the VLID electronic tag, read and verify the optical information of the VLID electronic tag, and send the read information to other devices. The working area of the reader is that the power transmission coil can provide the VLID electronic tag with normal Coverage of sufficient electrical power to work.

The power supply is used to provide electric energy for each functional module of the reader.

The power transmission module is used to generate electromagnetic signals to make the power transmission coil generate a charging electromagnetic field.

The power transmission coil is used to generate a charging electromagnetic field and transmit wireless charging energy.

The photoelectric sensor is used to sense and receive visible light signals and convert them into corresponding electrical signals.

The judgment module is used for performing analog-to-digital conversion on the electrical signal converted and output by the photoelectric sensor, and outputting the converted value to the ID verification module.

The ID verification module is used to demodulate and decode the information output by the judgment module, read and verify the received information sent by the VLID electronic tag.

The communication and control module is used for communicating with external equipment, and sending the VLID electronic label information and verification information received by the ID verification module.

The VLID electronic tag is used to receive the wireless energy of the reader, generate and store the information of the VLID electronic tag, modulate and code the information, and drive the LED to send visible light signals.

The power receiving coil utilizes the electromagnetic effect to inductively receive the induced electric and magnetic energy sent by the power transmitting coil, that is, the wireless charging energy, and transmits it to the power receiving module.

The electric energy receiving module collects the effective induction electric and magnetic energy received by the electric receiving coil, converts it into electric energy, and uses it as a power supply to supply power for each module of the VLID electronic tag.

The ID generation module is used to generate and save the information of the VLID electronic tag, modulate and encode the information, and send a driving signal to the LED driving module.

The LED driving module performs digital-to-analog conversion on the modulated coding signal output by the ID generating module, and drives the LED to send visible light signals.

The LED sends a visible light signal to the photoelectric sensor under the driving signal of the LED driving module.

The device of the present invention works in low power consumption mode:

When the VLID electronic tag is far away from the working area of the reader, it is in a passive state and does not work; it can only work normally after entering the working area of the reader to obtain power.

The reader is usually in the standby state. In the standby state: the power supply only supplies power to the power transmission module and the power transmission coil, and the power transmission module and the power transmission coil are in an unloaded state, forming a reader working area that can provide wireless electromagnetic energy to the outside.

When the VLID electronic tag enters the working area of the reader, the receiving coil will generate an induced electromagnetic field, and the mutual inductance effect between the induced electromagnetic field and the transmitting coil will cause the electromagnetic parameters of the electromagnetic field between the receiving coil and the transmitting coil to change.

After the power transmission module and the power transmission coil sense the change of electromagnetic parameters caused by the mutual inductance effect, the power transmission module sends a start signal to the power module, and the power module provides power to other functional modules of the reader, and all modules of the reader are powered on. After the power supply enters the normal working state, normal visible light communication can be performed on the VLID electronic tag.

The operating principle and steps of the device of the present invention are as follows:

S1. After the reader is powered on, the power transmission module 4 generates a changing electrical signal, and the power transmission coil 9 generates a changing charging electromagnetic field, and transmits wireless charging energy 11 outward.

S2. The power receiving coil 10 utilizes the electromagnetic effect to generate induced electromagnetic energy under the action of the changing charging electromagnetic field generated by the power transmitting coil 9 , and transmits it to the power receiving module 1 .

S3. The power receiving module 1 collects the effective induction power and magnetic energy received by the power receiving coil 10 and converts them into electric energy, which is used as a power supply to supply power to each module of the VLID electronic tag. At the same time, the power receiving coil 10 will generate an induced electromagnetic field to the power transmitting coil 9 , and the mutual inductance effect between the induced electromagnetic field and the power transmitting coil 9 will cause the electromagnetic parameters of the electromagnetic field between the power receiving coil 10 and the power transmitting coil 9 to change. After the power transmission module 4 and the power transmission coil 9 sense the change of the electromagnetic parameter caused by the mutual inductance effect, the power transmission module 4 sends a start signal to the power supply 8 module, and the power supply 8 module provides power to other functional modules of the reader, reading Each module of the device is powered on and enters the normal working state.

S4. After receiving electric energy from the electric energy receiving module 1, the VLID electronic tag starts to work on power, and the ID generating module 2 generates an ID information, and modulates and codes the information.

S5. The ID generating module 2 sends a driving signal to the LED driving module 3 according to the modulated and coded ID information, and the LED driving module 3 drives the LED 13 to send the visible light signal 12 .

S6. The photoelectric sensor 14 senses and receives the visible light signal 12 from the LED electronic tag, and converts it into a corresponding electrical signal.

S7 , the judgment module 7 performs judgment conversion on the electrical signal converted and output by the photoelectric sensor 14 , and outputs the converted value to the ID verification module 6 .

S8. The ID verification module 6 demodulates and decodes the output information of the decision module 7, identifies the information of the VLID electronic tag, and verifies it.

S9. The ID verification module 6 sends the information of the VLID electronic tag to the external organization through the communication and control module 5, and the external organization realizes functions such as communication and control with other devices.

The VLID electronic tag in the device of the present invention does not need battery power supply, which reduces the pollution of the battery and saves the trouble of replacing the battery; at the same time, because the communication signal in the visible light band is not interfered by the electromagnetic field, it does not generate electromagnetic signal interference and electromagnetic pollution. Good security, it is a green and environment-friendly communication method; at the same time, the optical communication signal also has a lighting function, which can provide short-term lighting for the reading and writing process, making the reading and writing process more convenient; the structure and function of the VLID electronic tag is simple and can be made Into a small micro-equipment; device reading and writing adopts non-contact working mode, easy to read and write. The device of the present invention can be used as a portable application solution replacing a magnetic card or a radio frequency ID card.

Description of drawings

Fig. 1 is a structural block diagram of a VLID electronic tag and a reader in an embodiment of the present invention.

Marks in the figure: 1-power receiving module; 2-ID generating module; 3-LED driver module; 4-power transmitting module; 5-communication and control module; 6-ID verification module; 7-judgment module; 8-power supply; 9-transmitting coil; 10-receiving coil; 11-wireless charging energy; 12-visible light signal; 13-LED; 14-photoelectric sensor.

Detailed ways

Example:

The one-way visible light identification passive electronic tag and reader device of this embodiment includes a VLID electronic tag and a reader. The VLID electronic tag consists of a power receiving coil 10, a power receiving module 1, an ID generating module 2, an LED driving module 3 and an LED13. Composition; the reader is composed of a power transmission coil 9, a power transmission module 4, an ID verification module 6, a communication and control module 5, a judgment module 7, a power supply 8 and a photoelectric sensor 14; wherein the power receiving coil 10 is connected to the power receiving module 1 , the power receiving module 1 is connected to the ID generating module 2 and the LED driving module 3 respectively, the ID generating module 2 and the LED driving module 3 are connected to each other, the LED driving module 3 is connected to the LED13, and the LED13 corresponds to the photoelectric sensor 14 through the visible light signal 12 , the photoelectric sensor 14 is arranged on the judgment module 7, the judgment module 7 is connected to the ID verification module 6, the ID verification module 6 is connected to the communication and control module 5, the power transmission module 4 is connected to the power transmission coil 9, and the power supply 8 is respectively connected to the power transmission module 4 , a communication and control module 5, an ID verification module 6 and a judgment module 7; the power transmitting coil 9 corresponds to the power receiving coil 10 through the wireless charging energy 11.

The reader is used to provide energy to the VLID electronic tag, read and verify the optical information of the VLID electronic tag, and send the read information to other devices. The working area of the reader is that the power transmission coil can provide the VLID electronic tag with normal Coverage of sufficient electrical power to work.

The power supply 8 is used to provide electric energy for each functional module of the reader.

The power transmission module 4 is used to generate electromagnetic signals to make the power transmission coil 9 generate a charging electromagnetic field.

The power transmission coil 9 is used to generate a charging electromagnetic field and transmit wireless charging energy 11 .

The photoelectric sensor 14 is used to sense and receive the visible light signal 12 and convert it into a corresponding electrical signal.

The judgment module 7 is used to perform analog-to-digital conversion on the electrical signal converted and output by the photoelectric sensor 14 , and output the converted value to the ID verification module 6 .

The ID verification module 6 is used to demodulate and decode the information output by the judgment module 7, and read and verify the received information sent by the VLID electronic tag.

The communication and control module 5 is used for communicating with external devices, and sending the VLID electronic tag information and verification information received by the ID verification module 6 .

The VLID electronic tag is used to receive the wireless energy of the reader, generate and store the information of the VLID electronic tag, modulate and code the information, and drive the LED 13 to send the visible light signal 12 .

The power receiving coil 10 utilizes the electromagnetic effect to inductively receive the induced electric and magnetic energy sent by the power transmitting coil 9 , that is, the wireless charging energy 11 , and transmits it to the power receiving module 1 .

The power receiving module 1 collects the effective induced electric and magnetic energy received by the power receiving coil 10, converts them into electric energy, and uses it as a power supply to supply power to each module of the VLID electronic tag.

The ID generation module 2 is used to generate and save the information of the VLID electronic tag, modulate and encode the information, and send a driving signal to the LED driving module 3 .

The LED driving module 3 performs digital-to-analog conversion on the modulated coded signal output by the ID generating module 2 , and drives the LED 13 to send the visible light signal 12 .

The LED 13 sends the visible light signal 12 to the photoelectric sensor 14 under the driving signal of the LED driving module 3 .

The device of this embodiment works in low power consumption mode:

When the VLID electronic tag is far away from the working area of the reader, it is in a passive state and does not work; it can only work normally after entering the working area of the reader to obtain power.

The reader is usually in a standby state, and in the standby state: the power source 8 only supplies power to the power transmitting module 4 and the power transmitting coil 9, and the power transmitting module 4 and the power transmitting coil 9 are in a no-load state, forming a reading device that can provide wireless electromagnetic energy 11 externally. device work area.

When the VLID electronic tag enters the working area of the reader, the receiving coil 10 will generate an induced electromagnetic field, and the mutual inductance effect between the induced electromagnetic field and the transmitting coil 9 will cause the electromagnetic field between the receiving coil 10 and the transmitting coil 9 to Electromagnetic parameter changes.

After the power transmission module 4 and the power transmission coil 9 sense the change of the electromagnetic parameter caused by the mutual inductance effect, the power transmission module 4 sends a start signal to the power supply 8 module, and the power supply 8 module provides power to other functional modules of the reader, reading After each module of the device is powered on and enters the normal working state, normal visible light communication can be performed on the VLID electronic tag.

The operating principle and steps of the device of this embodiment are as follows:

S1. After the reader is powered on, the power transmission module 4 generates a changing electrical signal, and the power transmission coil 9 generates a changing charging electromagnetic field, and transmits wireless charging energy 11 outward.

S2. The power receiving coil 10 utilizes the electromagnetic effect to generate induced electromagnetic energy under the action of the changing charging electromagnetic field generated by the power transmitting coil 9 , and transmits it to the power receiving module 1 .

S3. The power receiving module 1 collects the effective induction power and magnetic energy received by the power receiving coil 10 and converts them into electric energy, which is used as a power supply to supply power to each module of the VLID electronic tag. At the same time, the power receiving coil 10 will generate an induced electromagnetic field to the power transmitting coil 9 , and the mutual inductance effect between the induced electromagnetic field and the power transmitting coil 9 will cause the electromagnetic parameters of the electromagnetic field between the power receiving coil 10 and the power transmitting coil 9 to change. After the power transmission module 4 and the power transmission coil 9 sense the change of the electromagnetic parameter caused by the mutual inductance effect, the power transmission module 4 sends a start signal to the power supply 8 module, and the power supply 8 module provides power to other functional modules of the reader, reading Each module of the device is powered on and enters the normal working state.

S4. After receiving electric energy from the electric energy receiving module 1, the VLID electronic tag starts to work on power, and the ID generating module 2 generates an ID information, and modulates and codes the information.

S5. The ID generating module 2 sends a driving signal to the LED driving module 3 according to the modulated and coded ID information, and the LED driving module 3 drives the LED 13 to send the visible light signal 12 .

S6. The photoelectric sensor 14 senses and receives the visible light signal 12 from the LED electronic tag, and converts it into a corresponding electrical signal.

S7 , the judgment module 7 performs judgment conversion on the electrical signal converted and output by the photoelectric sensor 14 , and outputs the converted value to the ID verification module 6 .

S8. The ID verification module 6 demodulates and decodes the output information of the decision module 7, identifies the information of the VLID electronic tag, and verifies it.

S9. The ID verification module 6 sends the information of the VLID electronic tag to the external organization through the communication and control module 5, and the external organization realizes functions such as communication and control with other devices.

Claims (3)

1. an one-way visible light identification passive electronic label and reader device, it is characterized in that this device comprises VLID electronic tag and reader, VLID electronic tag is made up of electricity reception coil (10), electric energy receiver module (1), ID generation module (2), LED drive module (3) and LED (13), reader is made up of power transmission coil (9), electric energy transmitter module (4), ID authentication module (6), communication and control module (5), judging module (7), power supply (8) and photoelectric sensor (14), wherein, electricity reception coil (10) connects electric energy receiver module (1), electric energy receiver module (1) is connection ID generation module (2) and LED drive module (3) respectively, be interconnected between ID generation module (2) and LED drive module (3), LED drive module (3) connects LED (13), LED (13) is corresponding with photoelectric sensor (14) by visible light signal (12), photoelectric sensor (14) is arranged in judging module (7), judging module (7) connection ID authentication module (6), ID authentication module (6) connects communication and control module (5), electric energy transmitter module (4) connects power transmission coil (9), power supply (8) connects electric energy transmitter module (4) respectively, communication and control module (5), ID authentication module (6) and judging module (7), power transmission coil (9) is corresponding with electricity reception coil (10) by wireless charging energy (11),

Described reader is used for providing energy to VLID electronic tag, read, verify the optical information of VLID electronic tag, and the information of reading is sent to other equipment, the perform region of reader provide the coverage of enough electric energy of normal work can to VLID electronic tag for power transmission coil;

Described power supply (8) provides electric energy for each functional module for reader;

Described electric energy transmitter module (4), for generation of electromagnetic signal, makes power transmission coil (9) produce charged electrical magnetic field;

Described power transmission coil (9), for generation of charged electrical magnetic field, sends wireless charging energy (11);

Described photoelectric sensor (14) receives visible light signal (12) for responding to, and converts corresponding electric signal to;

Described judging module (7) carries out analog to digital conversion for the electric signal exported photoelectric sensor (14) conversion, and the numerical value of output conversion is to ID authentication module (6);

The information that described ID authentication module (6) exports for demodulation, decoding judging module (7), reads, verifies the information that the VLID electronic tag received sends;

Described communication and control module (5) for external device communication, send VLID electronic labeling information and authorization information that ID authentication module (6) receives;

Described VLID electronic tag, for receiving the radio energy of reader, produces, deposits the information of VLID electronic tag, modulate, encode to information, and driving LED (13) sends visible light signal (12);

Described electricity reception coil (10) utilizes galvanomagnetic effect, and induction receives induced electricity, the magnetic energy that power transmission coil (9) is sent, i.e. wireless charging energy (11), and is transferred to electric energy receiver module (1);

The actual induction electricity that electricity reception coil (10) accepts by described electric energy receiver module (1), magnetic energy collect, and are converted into electric energy, and are used as each module for power supply that power supply is VLID electronic tag;

Described ID generation module (2) for generation of, preserve the information of VLID electronic tag, information is carried out modulating-coding, and sends drive singal to LED drive module (3);

The modulating coding signal that ID generation module (2) exports by described LED drive module (3), carries out digital-to-analog conversion, and driving LED (13) sends visible light signal (12);

Described LED (13), under the drive singal of LED drive module (3), sends visible light signal (12) to photoelectric sensor (14).

2. one-way visible light identification passive electronic label as claimed in claim 1 and reader device, it is characterized in that, VLID electronic tag, when the perform region away from reader, is in passive state, does not work; After only entering the perform region acquisition electric energy of reader, could normally work;

Reader is in holding state at ordinary times, under holding state: power supply (8) is only to electric energy transmitter module (4) and power transmission coil (9) power supply, electric energy transmitter module (4) and power transmission coil (9) are in light condition, and formation externally can provide the reader perform region of wireless electromagnetic energy (11);

After VLID electronic tag enters the perform region of reader, electricity reception coil (10) can produce an induction field, and the mutual inductance effect that this induction field and power transmission coil (9) produce can cause the electromagnetic parameter of the electromagnetic field between electricity reception coil (10) and power transmission coil (9) to change;

After electric energy transmitter module (4) and power transmission coil (9) sense the change of the electromagnetic parameter caused by mutual inductance effect, electric energy transmitter module (4) just sends enabling signal to power supply (8) module, power supply (8) module provides electric energy to other functional modules of reader, the each module of reader all powers on and enters normal operating conditions, just can carry out normal visible light communication to VLID electronic tag.

3. one-way visible light identification passive electronic label as claimed in claim 1 and reader device, it is characterized in that the principle of work of this device and step as follows:

After S1, reader power on, the electric signal that electric energy transmitter module (4) changes, and the charged electrical magnetic field changed by power transmission coil (9), outwards launch wireless charging energy (11);

S2, electricity reception coil (10) utilize galvanomagnetic effect, under the charged electrical magnetic fields that power transmission coil (9) changes, produce inductive electromagnetic energy, and are transferred to electric energy receiver module (1);

Actual induction electric energy, magnetic energy collection that electricity reception coil (10) receives by S3, electric energy receiver module (1), and be converted into electric energy, being used as power supply is each module for power supply of VLID electronic tag; Simultaneously, electricity reception coil (10) can produce an induction field to power transmission coil (9), and the mutual inductance effect that this induction field and power transmission coil (9) produce can cause the electromagnetic parameter of the electromagnetic field between electricity reception coil (10) and power transmission coil (9) to change; After electric energy transmitter module (4) and power transmission coil (9) sense the change of the electromagnetic parameter caused by mutual inductance effect, electric energy transmitter module (4) just sends enabling signal to power supply (8) module, power supply (8) module provides electric energy to other functional modules of reader, and each module of reader all powers on and enters normal operating conditions;

S4, obtain electric energy from electric energy receiver module (1) after, VLID electronic tag starts to work on power, ID generation module (2) generate an id information, information is carried out modulating-coding;

S5, ID generation module (2) is according to the id information through modulating-coding, send drive singal to LED drive module (3), LED drive module (3) driving LED (13) sends visible light signal (12);

The induction of S6, photoelectric sensor (14) receives the visible light signal (12) from LED electrical subtab, and converts corresponding electric signal to;

S7, judging module (7) carry out judgement conversion to the electric signal that photoelectric sensor (14) conversion exports, and export transformed data to ID authentication module (6);

The output information of S8, ID authentication module (6) demodulating and decoding judging module (7), identifies the information of VLID electronic tag, and is verified;

S9, ID authentication module (6), by the information of VLID electronic tag, is sent to external agency by communication and control module (5), realizes the function such as communication, control with other equipment by external agency.