TWI415007B - Induction charged rfid system and execute method thereof - Google Patents

Abstract

The present invention provided an induction chargingRFID system, including a reader, a tag, and a magnetic field induction unit. The tag includes a secondary coil, an electric charging element, and a rectifying circuit bridging the secondary coil and the electric charging element. The magnetic field induction unit includes a primary coil and an alternating current supply. The primary coil generates the induction magnetic field by alternating current. When the secondary coil is located within the range of the induction magnetic field, the coil will generate an electromotive force (EMF). The rectifying circuit then transforms the EMF to direct current and stores the power in the electric charging element. The power stored is then used to drive the RFID in an intermittent manner.

Description

Inductive energy storage radio frequency identification system and implementation method thereof

The present invention relates to a radio frequency identification system, and more particularly to a radio frequency identification system having an energy storage technology.

Radio Frequency Identification (RFID) is widely used in current applications, including access control, logistics management, and medical care.

Please refer to the first figure, which is a schematic diagram of a conventional RFID system architecture. The RFID system is composed of a reader 110, a radio frequency tag 120 and a control unit 140.

The reader 110 has an antenna 111 capable of continuously transmitting signals to generate an induced magnetic field. When the RF tag 120 enters the range of the induced magnetic field, the reader 110 can read the data in the RF tag 120, and then The data is transferred to the control unit 140 for the next stage of processing.

The radio frequency tag 120 has a transmitting antenna 124, and the internal data is a serial number or an identification code. Different serial numbers or identification codes may represent different information, and the information may be correspondingly constructed in the control unit 140. When the RF tag 120 enters the range of the induced magnetic field of the reader 110, the transmitting antenna 124 is subjected to an induced magnetic field, and the serial number or the identification code in the RF tag 120 is transmitted to the reader 110 by using a wireless communication method. The identification, tracking and management of the radio frequency tag 120 are performed on the control unit 140 by the serial number or identification code in the radio frequency tag 120 and the identification technology of the reader 110.

The RFID system can provide a superior monitoring mechanism. Not only the reader 110 can simultaneously sense a plurality of RF tags 120, but also can generate different reading distances according to different RF powers, and has successfully replaced the Bar code. An important role in modern management technology. The industry hopes to improve the efficiency of supply chain management on the one hand and reduce logistics costs on the other.

At present, the conventional RFID system mainly uses two kinds of radio frequency tags 120. One is a passive radio frequency tag, and the reader 110 needs to emit a magnetic field at a short distance, and the induction coil in the passive radio frequency tag is given a radio frequency signal to the reader 110 by charging, because the unit price is low, and the volume is small, and is widely used. Used in logistics management. The other is an active radio frequency tag. The active radio frequency tag has a battery to provide power, and the identification code can be actively sent from the power supply induction coil to the reader 110 to provide remote object management.

However, such conventional RFID systems have their limitations. The disadvantage of passive RF tags is that the sensing distance is too close, and it is impossible to carry out automated logistics management in a large storage space. It is still necessary to use personnel for individual management and single inventory procedures, which is not only time-consuming but also inconvenient to use. The active coil is a big limitation of logistics management because of its high unit price, small volume, and the need to replace the battery after a certain period of use.

The invention provides a radio frequency identification (RFID) system for inductive energy storage, the RFID system comprising a reader, a radio frequency tag and a magnetic field generating unit.

The radio frequency tag can be coupled to the reader by means of wireless communication, and the biggest difference from the conventional RFID system is that the RFID system of the present invention has a magnetic field generating unit and the radio frequency tag has an energy storage device.

The energy storage device of the radio frequency tag has a first coil, a power storage component and a rectifier circuit, and the rectifier circuit is electrically connected to the first coil and the power storage component, respectively.

The magnetic field generating unit has a second coil, and the second coil can generate a sympathetic magnetic field by being supplied with an alternating current. When the first coil is located within the range of the sympathetic magnetic field, the first coil generates an induced electromotive force, and the rectifier circuit converts the alternating current generated by the induced electromotive force into direct current for storage in the storage element.

The advantages and spirit of the present invention, as well as the more detailed embodiments, can be further understood from the following embodiments and the accompanying drawings.

Please refer to the second figure, which is a schematic diagram of the architecture of the radio frequency identification (RFID) system of the present invention. The RFID system of the present invention includes a reader 210, a radio frequency tag 220, and a magnetic field generating unit 230.

Like the conventional RFID system, the radio frequency tag 220 has an identification code, the different identification code can represent different information, and the radio frequency tag 220 can be coupled to the reader 210 by means of wireless communication, and the biggest difference from the traditional RFID system is that The RFID system of the invention is provided with a magnetic field generating unit 230 and an RF tag 220 having an energy storage device 221.

The energy storage device 221 of the radio frequency tag 220 has a first coil 2211, a storage element 2212, and a rectifier circuit 2213. The rectifier circuit 2213 is electrically connected to the first coil 2211 and the storage element 2212, respectively.

The magnetic field generating unit 230 has a second coil 231 capable of generating a sympathetic magnetic field 232 by being supplied with an alternating current. It can be known from Faraday's law that the magnitude of the induced electromotive force ε generated in the circuit is equal to the time-varying rate of the magnetic flux passing through the circuit, that is, ε=N(dφ/dt); therefore, when the first coil 2211 is located within the range of the sympathetic magnetic field 232, A coil 2211 will generate an induced electromotive force, and the rectifier circuit 2213 converts the alternating current generated by the induced electromotive force into direct current for storage in the storage element 2212, wherein the storage element 2212 is composed of a capacitive element.

In addition, the radio frequency tag 220 has a transmit antenna 224 that can transmit radio frequency signals to the reader 210 using the power stored by the storage element 2212.

The RFID system of the present invention may further include a control unit 240. The control unit 240 and the reader 210 may be connected by wireless or wired communication, and the control unit 240 may be a computer system, an identification code in the radio frequency tag 220, and the like. Corresponding information can be constructed in the control unit 240.

Therefore, when the transmitting antenna 224 of the radio frequency tag 220 transmits the RF signal with the control code to the reader 210, the reader 210 reads the RF signal, and then transmits the RF signal to the control unit, and then transmits the control unit to the control unit 240. Resolution, tracking and management of the radio frequency tag 220.

Please refer to the third figure, which is a step diagram of the method for executing the radio frequency identification system of the present invention. The radio frequency system of the present invention comprises a reader 210 and a radio frequency tag 220. The radio frequency tag 220 has a first coil 2211, a storage element 2212 and a rectifying circuit 2213. The step includes: a first step S1: a magnetic field The generating unit 230 generates a sympathetic magnetic field 232 by supplying a second coil 231 to an alternating current.

Second step S2: It can be known from Faraday's law that the magnitude of the induced electromotive force ε generated in the circuit is equal to the time-varying rate of the magnetic flux passing through the circuit, that is, ε=N(dφ/dt); the first coil 2211 is obtained by the sympathetic magnetic field 232. The electromotive force is induced to generate an alternating current, and the rectifier circuit 2213 of the radio frequency tag 220 converts the alternating current into direct current for storage in the storage element 2212.

The third step S3: the radio frequency tag 220 transmits an RF signal to the reader 210 by using the power stored by the storage element 2212.

Fourth Step S4: A control unit 240 follows the RF signal received by the reader 210 for subsequent actions.

Please refer to the fourth figure, which is a schematic diagram of an embodiment of the radio frequency identification system of the present invention. In this embodiment, the plurality of radio frequency tags 220 are located in the sympathetic magnetic field 232 generated by the magnetic field generating unit 230. The radio frequency tags 220 can continuously generate electric power by the symmetry magnetic field 232, so that the radio frequency tag 220 can be used for a long time and has an active radio frequency tag. Efficacy, without having to worry about the problem of insufficient power to replace the battery.

Please refer to the fifth figure, which is a schematic diagram of another embodiment of the radio frequency identification system of the present invention. In this embodiment, the plurality of spaces R1, R2, R3, and R4 each have a plurality of radio frequency tags 220. As long as the radio frequency tags 220 in the range of the sympathetic magnetic field 232 can continue to have power, each of the readers 210 collects each of them. The RF signal of the RF tag 220 is transmitted to the control unit 240 in a wired or wireless transmission mode for subsequent operations.

The second coil 231 used by the magnetic field generating unit 230 of the RFID system of the present invention is preferably a large coil because it can generate a wide range of sympathetic magnetic fields, so that the radio frequency tag 220 can be charged in a wide range.

In addition, the symmetry magnetic field 232 of the RFID system of the present invention is preferably a low frequency magnetic field because the low frequency magnetic field has high penetrating ability and can easily penetrate a building such as a building space or a room storage space.

The RFID system and the execution method thereof are improved for the defects of the conventional RFID system, and the new energy storage technology is applied to the radio frequency tag 220 of the RFID system, and a radio frequency tag 220 capable of receiving magnetic field induction for charging is constructed, and the radio frequency tag 220 is actively generated. The RF signal is sent to the reader 210. It is not necessary to read the passive RF tag at a close distance, and it can achieve the function of the active RF tag, and can automatically charge in the environment to effectively overcome the inconvenience of the active RF tag to replace the battery.

Such a radio frequency tag 220 is also relatively simple in design of its electronic components, and its volume and unit price can be lower than the active radio frequency tag. Save time and cost, have convenient and safe features, can be applied to various industries, and even apply to medical services for the benefit of the public.

The present invention has been described above by way of a preferred example, and it is not intended to limit the spirit of the invention and the inventive subject matter. Those skilled in the art can easily understand and utilize other components or means to produce the same effect. Modifications made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

110, 210. . . Reader

111. . . antenna

120, 220. . . RF tag

140, 240. . . control unit

124, 224. . . Transmitting antenna

221. . . Energy storage device

2211. . . First coil

2212. . . Power storage component

2213. . . Rectifier circuit

230. . . Magnetic field generating unit

231. . . Second coil

232. . . Sympathetic magnetic field

R1, R2, R3, R4. . . space

The above and many of the advantages of the invention will be readily apparent from the following detailed description,

Figure 1: Schematic diagram of the architecture of a traditional radio frequency identification system;

Second: a schematic diagram of the architecture of the radio frequency identification system of the present invention;

Third: a step diagram of a method for performing a radio frequency identification system of the present invention;

Fourth: a schematic diagram of an embodiment of a radio frequency identification system of the present invention;

Figure 5 is a schematic diagram of another embodiment of the radio frequency identification system of the present invention.

210. . . Reader

220. . . RF tag

240. . . control unit

224. . . Transmitting antenna

221. . . Energy storage device

2211. . . First coil

2212. . . Power storage component

2213. . . Rectifier circuit

230. . . Magnetic field generating unit

231. . . Second coil

232. . . Sympathetic magnetic field

Claims (13)

A radio frequency identification system comprising: a plurality of readers; a plurality of radio frequency tags coupled to the readers, the radio frequency tags each having an energy storage device, and the energy storage device has a first coil and a storage element a magnetic field generating unit having a second coil, which generates a sympathetic magnetic field by supplying an alternating current to the second coil, and the second coil is wound around an outer side of the region formed by the first coil; wherein the first The coil obtains an induced electromotive force by the sympathetic magnetic field, thereby generating a current stored in the storage element. The radio frequency identification system of claim 1, further comprising a control unit, and the readers are coupled to the control unit. The radio frequency identification system of claim 2, wherein the control unit is a computer system. The radio frequency identification system of claim 1, wherein the storage element is a capacitive element. The radio frequency identification system of claim 1, wherein the first coil is generated by the sympathetic magnetic field to obtain an induced electromotive force system using Faraday's law. The radio frequency identification system of claim 1, wherein the radio frequency tags have a transmitting antenna for actively transmitting an RF signal to the readers. The radio frequency identification system of claim 6, wherein the transmitting antenna uses the power stored by the storage element to transmit the radio frequency signal to the readers. The radio frequency identification system of claim 1, wherein the energy storage device further comprises a rectifying circuit to convert the current into a continuous current. The radio frequency identification system of claim 1, wherein the sympathetic magnetic field is a low frequency magnetic field. A method for performing a radio frequency identification system as described in claim 1, wherein the radio frequency system includes a plurality of radio frequency tags coupled to the plurality of readers, wherein the radio frequency tags each have a first coil and a storage element. The step includes: a magnetic field generating unit generates a sympathetic magnetic field by supplying a second coil and an alternating current; the first coil obtains an induced electromotive force by the sympathetic magnetic field, thereby generating a current stored in the storage element; The tag transmits an RF signal to the readers using the power stored by the storage element. The method performed by the radio frequency identification system of claim 10, wherein the first coil is obtained by the sympathetic magnetic field to obtain an induced electromotive force system using Faraday's law. The method performed by the radio frequency identification system according to claim 10, further comprising a control unit according to the shots received by the readers The frequency signal is used for subsequent actions. The method performed by the radio frequency identification system according to claim 10, further comprising a rectifying circuit that converts the current into a continuous current and stores the electric storage element.