A radio frequency identification transponder with energy harvesting function

Abstract

The present invention provides a radio frequency identification transponder with an energy collection function, the radio frequency identification transponder with the energy collection function comprises a transponder, a rectifier and a single integrated coil; wherein the single integrated coil is connected to the transponder and the rectifier at the same time; the rectifier is used to convert alternating current into direct current and supply power to a subsequent circuit of the transponder through the single integrated coil; the single integrated coil is also used to realize the radio frequency induction identification communication of the transponder; it can be seen that the radio frequency identification transponder with the energy collection function integrates the original power supply coil and the transponder induction coil into a single integrated coil, so that the single integrated coil can simultaneously meet the two requirements of power supply of the subsequent circuit and radio frequency identification communication of the transponder, and can also effectively avoid the occurrence of inductive coupling between different coils, which causes the reliability of the transponder communication to decrease and the production cost of the radio frequency identification transponder to increase.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency identification devices, and in particular to a radio frequency identification transponder with an energy collection function. Background Art

[0002] The existing RFID transponders all contain two coils, one coil A is used to power the transponder C, and the other coil B is used to drive the bridge rectifier D in the transponder to convert the alternating current into a direct current for use by the subsequent circuit. The circuit structure is as follows: Figure 1 As shown. However, under normal circumstances, due to the limitation of circuit layout, the coil A will be arranged in a way that wraps the transponder C, which will cause the resonant frequency of coil A and coil B to become difficult to adjust due to the coupling effect, thereby affecting the product yield of large-scale production of RFID transponders, and the change of the DC load on the coil A will also affect the communication between the transponder and the external reading and writing equipment, thereby reducing the communication reliability. In addition, when the power of the external reading and writing equipment is large, the alternating current voltage on the coil A may be as high as tens of volts to hundreds of volts, which puts higher requirements on the rectification performance of the rectifier, thereby increasing the difficulty of selecting the rectifier and the subsequent circuit, and also increasing the production cost of large-scale production of RFID transponders. It can be seen that the circuit structure of setting two coils in the RFID transponder of the prior art will reduce its communication performance and increase the production cost. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides a radio frequency identification transponder with an energy collection function, the radio frequency identification transponder with an energy collection function comprises a transponder, a rectifier and a single integrated coil; wherein the single integrated coil is connected to the transponder and the rectifier at the same time; the rectifier is used to convert alternating current into direct current and supply power to the subsequent circuit of the transponder through the single integrated coil; the single integrated coil is also used to realize the radio frequency induction identification communication of the transponder; it can be seen that the radio frequency identification transponder with an energy collection function integrates the original power supply coil and the transponder induction coil into a single integrated coil, so that the single integrated coil can simultaneously meet the two requirements of power supply of the subsequent circuit and radio frequency identification communication of the transponder, and can also effectively avoid the occurrence of inductive coupling between different coils, which causes the reliability of the transponder communication to decrease and the production cost of the radio frequency identification transponder to increase.

[0004] The present invention provides a radio frequency identification transponder with an energy collection function, characterized in that:

[0005] The radio frequency identification transponder with energy harvesting function comprises a transponder, a rectifier and a single integrated coil; wherein,

[0006] The single integrated coil is connected to both the transponder and the rectifier;

[0007] The rectifier is used to convert AC power into DC power and supply power to the subsequent circuit of the transponder through the single integrated coil;

[0008] The single integrated coil is also used to implement radio frequency induction identification communication of the transponder;

[0009] Further, the two ends of the single integrated coil are connected in parallel to the transponder and the rectifier;

[0010] Further, the rectifier is a bridge rectifier;

[0011] The bridge rectifier has a full-wave rectification structure or a half-wave rectification structure;

[0012] Further, the transponder includes a transponder chip;

[0013] The rectifier is formed by a rectifier tube which is discretely externally arranged relative to the transponder chip;

[0014] The rectifier tube and the transponder chip are connected in parallel to both ends of the single integrated coil;

[0015] Further, the transponder includes a transponder chip;

[0016] The rectifier is formed by a semiconductor rectifier tube built into the transponder chip;

[0017] Two ends of the single integrated coil are connected to the transponder chip;

[0018] Furthermore, the transponder further comprises a limiting circuit; wherein,

[0019] The limiting circuit is used to control the alternating voltage amplitude of the single integrated coil, so as to ensure that the DC amplitude output by the rectifier is relatively stable;

[0020] Further, the limiting circuit is a diode limiting circuit or a triode limiting circuit;

[0021] or,

[0022] The amplitude limiting circuit is an upper amplitude limiting circuit, a lower amplitude limiting circuit or a bidirectional amplitude limiting circuit;

[0023] Further, the transponder includes a transponder chip; wherein,

[0024] The transponder chip includes a digital signal output pin and a ground pin;

[0025] Furthermore, the digital signal output pin of the transponder chip is used to output level signals with different high and low values ​​according to instructions from an external reader / writer;

[0026] Furthermore, the RFID transponder further comprises a follow-up circuit, which is used to control the output state of the DC voltage rectified by the rectifier; wherein,

[0027] The subsequent circuit includes a switching diode, a triode or a field effect transistor.

[0028] Compared with the prior art, the RFID transponder with energy collection function includes a transponder, a rectifier and a single integrated coil; wherein the single integrated coil is connected to the transponder and the rectifier at the same time; the rectifier is used to convert alternating current into direct current and supply power to the subsequent circuit of the transponder through the single integrated coil; the single integrated coil is also used to realize the radio frequency induction identification communication of the transponder; it can be seen that the RFID transponder with energy collection function integrates the original power supply coil and the transponder induction coil into a single integrated coil, so that the single integrated coil can simultaneously meet the two requirements of power supply of the subsequent circuit and radio frequency identification communication of the transponder, and can also effectively avoid the occurrence of inductive coupling between different coils, which causes the reliability of the transponder communication to decrease and the production cost of the radio frequency identification transponder to increase.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the circuit structure of a radio frequency identification transponder provided by the prior art.

[0033] Figure 2 A schematic diagram of the circuit structure of a radio frequency identification transponder with energy harvesting function provided by the present invention.

[0034] Figure 3 A schematic diagram of the circuit structure of a transponder chip and a rectifier tube in a radio frequency identification transponder with energy collection function provided by the present invention.

[0035] Figure 4 A schematic diagram of circuit pins of a radio frequency identification transponder chip in a radio frequency identification transponder with energy harvesting function provided by the present invention.

[0036] Figure numerals: 1. transponder; 2. rectifier; 3. single integrated coil; 4. transponder chip; 5. digital signal output pin; 6. ground pin. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 2 , is a schematic diagram of the circuit structure of a radio frequency identification transponder with energy harvesting function provided by the present invention. The radio frequency identification transponder with energy harvesting function includes a transponder, a rectifier and a single integrated coil; wherein,

[0039] The single integrated coil is connected to both the transponder and the rectifier;

[0040] The rectifier is used to convert AC power into DC power and supply power to the subsequent circuit of the transponder through the single integrated coil, wherein the subsequent circuit may be but is not limited to various sensors, motors or electromagnetic coils, etc.;

[0041] The single integrated coil is also used to implement radio frequency inductive identification communications of the transponder.

[0042] It can be seen that the single integrated coil in the RFID transponder has two different functions of power supply and RFID communication, which can effectively reduce the number of coils in the RFID transponder, thereby avoiding inductive coupling between different coils to affect the working state of the coil itself and reduce the communication performance of the RFID transponder, and can also greatly reduce the production cost of the RFID transponder and improve the production yield.

[0043] Preferably, two ends of the single integrated coil connect the transponder and the rectifier in parallel.

[0044] Preferably, the rectifier is a bridge rectifier;

[0045] The bridge rectifier has a full-wave rectification structure or a half-wave rectification structure.

[0046] By configuring the rectifier to have a full-wave rectification structure or a half-wave rectification structure, the rectification performance of the rectifier can be improved, thereby improving the reliability and stability of the rectifier in performing AC conversion, and improving the rectification efficiency.

[0047] Preferably, the transponder further comprises a limiting circuit; wherein,

[0048] The amplitude limiting circuit is used to control the amplitude of the alternating voltage of the single integrated coil, so as to ensure that the amplitude of the direct current output by the rectifier is relatively stable.

[0049] Preferably, the amplitude limiting circuit is a diode amplitude limiting circuit or a transistor amplitude limiting circuit.

[0050] Preferably, the amplitude limiting circuit is an upper amplitude limiting circuit, a lower amplitude limiting circuit or a bidirectional amplitude limiting circuit.

[0051] By setting a limiting circuit, it is possible to avoid excessive fluctuations in the alternating voltage of the single integrated coil, thereby ensuring the stability of the direct current power supply of the rectifier.

[0052] Preferably, the RFID transponder further comprises a follow-up circuit, which is used to control the output state of the DC voltage rectified by the rectifier; wherein,

[0053] The subsequent circuit includes a switching diode, a triode or a field effect transistor.

[0054] By providing the subsequent circuit, the stability and intelligence of the DC voltage output of the rectifier can be improved, thereby ensuring the stable and normal operation of the radio frequency identification transponder and effectively simplifying the design difficulty and manufacturing cost of the subsequent circuit.

[0055] See also Figure 3 , is a schematic diagram of the circuit structure of a transponder chip and a rectifier tube in a radio frequency identification transponder with energy harvesting function provided by the present invention. The transponder chip and the rectifier tube can form a corresponding circuit result in the form of discrete components or integrated components.

[0056] Preferably, from the Figure 3 As can be seen from the left side figure, the transponder includes a transponder chip; the rectifier is formed by a rectifier tube that is discretely external to the transponder chip; the rectifier tube and the transponder chip are connected in parallel to both ends of the single integrated coil.

[0057] Preferably, from the Figure 3As can be seen from the right side figure, the transponder includes a transponder chip; the rectifier is formed by a semiconductor rectifier tube built into the transponder chip; and both ends of the single integrated coil are connected to the transponder chip.

[0058] The circuit connection structure between the rectifier tube and the transponder chip is set by discrete external or integrated internal means, which can meet the requirements of the internal circuit structure setting of different RFID transponders, thereby greatly improving the working stability of the RFID transponder.

[0059] See also Figure 4 , is a circuit pin diagram of a radio frequency identification transponder chip in a radio frequency identification transponder with energy harvesting function provided by the present invention. The transponder includes a transponder chip; wherein the transponder chip includes a digital signal output pin and a ground pin.

[0060] Preferably, the digital signal output pin of the transponder chip is used to output level signals with different high and low values ​​according to instructions from an external reader / writer.

[0061] The corresponding level signal is outputted through the digital signal output pin of the transponder chip, which can facilitate the control of the power supply logic of the power supply voltage, thereby ensuring the stability of the power supply.

[0062] It can be seen from the contents of the above embodiments that the RFID transponder with energy collection function includes a transponder, a rectifier and a single integrated coil; wherein the single integrated coil is connected to the transponder and the rectifier at the same time; the rectifier is used to convert alternating current into direct current and supply power to the subsequent circuit of the transponder through the single integrated coil; the single integrated coil is also used to realize the RFID induction identification communication of the transponder; it can be seen that the RFID transponder with energy collection function integrates the original power supply coil and the transponder induction coil into a single integrated coil, so that the single integrated coil can simultaneously meet the two requirements of power supply of the subsequent circuit and RFID communication of the transponder, and can also effectively avoid the occurrence of inductive coupling between different coils, which causes the reliability of the transponder communication to decrease and the production cost of the RFID transponder to increase.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A radio frequency identification transponder with energy harvesting function, characterized in that : The radio frequency identification transponder with energy harvesting function comprises a transponder, a rectifier and a single integrated coil; wherein, The single integrated coil is connected to both the transponder and the rectifier; The rectifier is used to convert AC power into DC power and supply power to the subsequent circuit of the transponder through the single integrated coil; The single integrated coil is also used to implement radio frequency induction identification communication of the transponder; The two ends of the single integrated coil connect the transponder and the rectifier in parallel; The rectifier is a bridge rectifier; The bridge rectifier has a full-wave rectification structure or a half-wave rectification structure; The transponder includes a transponder chip; The rectifier is formed by a rectifier tube which is discretely externally arranged relative to the transponder chip; The rectifier tube and the transponder chip are connected in parallel to both ends of the single integrated coil; The rectifier is formed by a semiconductor rectifier tube built into the transponder chip; Two ends of the single integrated coil are connected to the transponder chip; The transponder also includes a limiting circuit; wherein, The limiting circuit is used to control the alternating voltage amplitude of the single integrated coil, so as to ensure that the DC amplitude output by the rectifier is relatively stable; The amplitude limiting circuit is a diode amplitude limiting circuit or a triode amplitude limiting circuit; or, The amplitude limiting circuit is an upper amplitude limiting circuit, a lower amplitude limiting circuit or a bidirectional amplitude limiting circuit; The transponder chip includes a digital signal output pin and a ground pin; The digital signal output pin of the transponder chip is used to output level signals with different high and low values ​​according to instructions from an external reader / writer; The RFID transponder further includes a follow-up circuit, which is used to control the output state of the DC voltage rectified by the rectifier; wherein, The subsequent circuit includes a switching diode, a triode or a field effect transistor.

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