CN109101853B - Radio frequency identification reader-writer system protection and antenna port detection system - Google Patents
Radio frequency identification reader-writer system protection and antenna port detection system Download PDFInfo
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- CN109101853B CN109101853B CN201810852336.9A CN201810852336A CN109101853B CN 109101853 B CN109101853 B CN 109101853B CN 201810852336 A CN201810852336 A CN 201810852336A CN 109101853 B CN109101853 B CN 109101853B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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Abstract
The invention discloses a radio frequency identification reader-writer system protection and antenna port detection system, which comprises a radio frequency coaxial connector detection device and a detection circuit connected with the radio frequency coaxial connector detection device; the radio frequency coaxial connector detection device comprises a circular ring part and a supporting part connected with the circular ring part; the annular component is sleeved on a sleeve of the radio frequency coaxial connector, and the inner diameter of the annular component is larger than the outer diameter of the sleeve; the supporting component comprises a fixing part at the bottom and a connecting part at the top, one end of the connecting part is connected with the fixing part, and the other end of the connecting part is connected with the circular ring component. The invention adopts the tablet mechanical structure to detect the antenna connection, has high reliability, strong stability and long service life, is not easy to lose efficacy due to the influence of the surrounding environment, can be suitable for a single antenna port or a plurality of antenna ports, and ensures the system safety.
Description
Technical Field
The invention belongs to the technical field of ultrahigh frequency RFID, and particularly relates to a system for protecting a radio frequency identification reader-writer system and detecting an antenna port.
Background
Radio Frequency Identification (RFID), electronic Tag (E-Tag), is a technology that automatically identifies a target object and acquires related information using a Radio Frequency signal. With the progress of technology, the application field of the RFID is gradually expanded, which relates to various aspects of daily life of people and becomes a basic technology for the construction of the future information society.
Typical applications of RFID include: the system is used for warehouse management, production line automation and daily necessities sale in the field of logistics; the system is used for container and parcel management, highway charging and parking charging in the field of transportation; the method is used for managing sheep flocks, fishes, fruits and the like and tracking pets and wild animals in agriculture, animal husbandry and fishery; the system is used for medicine production, patient nursing and medical waste tracking in the medical industry; the method is used for visual management of parts and inventory in the manufacturing industry; the RFID can also be applied to various application fields such as book and document management, entrance guard management, positioning, object tracking, environment perception, check anti-counterfeiting and the like.
The ultrahigh frequency radio frequency identification reader-writer has the characteristics of long-distance identification, multi-label identification, high efficiency and the like, and along with the development of the internet of things technology, the ultrahigh frequency radio frequency identification reader-writer is widely applied to various scenes such as logistics, personnel attendance, asset management, warehouse material inventory, intelligent transportation, electronic license plate management, army information construction and the like.
Generally, most radio frequency identification readers can support 4 paths or even more antenna ports shared by receiving and transmitting, but in an actual application scene, all the antenna ports are not connected with antennas for use, and most unused antenna ports are suspended, so that great hidden danger is brought to stable operation of equipment in a complex electromagnetic environment; on the other hand, the mismatching between the antenna port for reflected power set by the system software and the antenna port actually connected to the coaxial cable may bring great risks of damage to the power amplifier and the low noise amplifier of the reader/writer, even burning of the receiving demodulator, and bring irreparable trauma to the reader/writer. For high power output devices, this damage is even more fatal and irreversible.
Disclosure of Invention
The invention aims to: in order to solve the problems in the prior art, the invention provides a radio frequency identification reader-writer system protection and antenna port detection system.
The technical scheme of the invention is as follows: a radio frequency identification reader-writer system protection and antenna port detection system comprises a radio frequency coaxial connector detection device and a detection circuit connected with the radio frequency coaxial connector detection device; the radio frequency coaxial connector detection device comprises a circular ring part and a supporting part connected with the circular ring part; the annular component is sleeved on a sleeve of the radio frequency coaxial connector, and the inner diameter of the annular component is larger than the outer diameter of the sleeve; the supporting component comprises a fixing part at the bottom and a connecting part at the top, one end of the connecting part is connected with the fixing part, and the other end of the connecting part is connected with the circular ring component.
Further, the fixing part of the supporting part is provided with threads, and the fixing part penetrates through an opening in the equipment shell and is matched with a nut for fixing.
Furthermore, a first insulating rubber gasket and a second insulating rubber gasket are respectively arranged between the fixing part of the supporting part and two contact surfaces of the equipment shell.
Furthermore, a third insulating rubber gasket is arranged on the fixing part of the supporting part and the inner wall of the opening of the equipment shell.
Further, a wire welding column is arranged between the second insulating rubber gasket and the nut.
Further, the radio frequency coaxial connector detection device is connected with a detection circuit through a wire welding column, and the detection circuit is connected in series in a power supply loop of the radio frequency identification reader-writer system.
Further, the detection circuit specifically comprises a P-channel MOS transistor, an NPN-type triode, a first resistor, a second resistor, a third resistor, and a diode; an emitting electrode of the NPN type triode is connected with a PAD pin, a base electrode of the NPN type triode is connected with the PAD pin through a third resistor and is connected with the input end of an external power supply through a second resistor, and a collector electrode of the NPN type triode is connected with the input end of the external power supply through a first resistor and is connected with a grid electrode of a P-channel MOS tube; the source electrode of the P-channel MOS tube is connected with the input end of an external power supply, and the drain electrode of the P-channel MOS tube is connected with the power supply input end of equipment and is connected with the source electrode of the P-channel MOS tube through a diode; and the PAD pin is connected with the wire welding column.
The invention has the following beneficial effects: (1) the antenna connection is detected by adopting a tablet mechanical structure, so that the reliability is high, the stability is strong, the service life is long, and the antenna connection is not easy to lose effectiveness under the influence of the surrounding environment;
(2) the radio frequency coaxial connectors can be used in series, if any port radio frequency cable is not connected, the PAD pin cannot have low level input, and therefore the power input of the external adapter cannot supply power to the equipment through the detection system, the power amplifier cannot be started, the system safety is guaranteed, and all ports of the system or the equipment are ensured to be correctly connected.
Drawings
Fig. 1 is a schematic structural diagram of a system for protecting an rfid reader and detecting an antenna port according to the present invention.
FIG. 2 is a schematic view of the assembly of the support member in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a detection circuit in an embodiment of the invention.
Wherein the reference numerals are: 1. radio frequency coaxial connector detection device, 11, ring part, 12, connecting portion, 13, fixed part, 14, first insulating rubber gasket, 15, third insulating rubber gasket, 16, second insulating rubber gasket, 17, wire welding post, 18, nut, 2, radio frequency coaxial connector, 21, sleeve pipe, 3, detection circuitry.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 system for protecting a radio frequency identification reader/writer and detecting an antenna port according to the present invention. A radio frequency identification reader-writer system protection and antenna port detection system comprises a radio frequency coaxial connector detection device 1 and a detection circuit 3 connected with the radio frequency coaxial connector detection device 1; the radio frequency coaxial connector detection device 1 comprises a circular ring part 11 and a supporting part connected with the circular ring part 11; the annular part 11 is sleeved on a sleeve 21 of the radio frequency coaxial connector 2, and the inner diameter of the annular part 11 is larger than the outer diameter of the sleeve 21; the supporting component comprises a fixing part 13 at the bottom and a connecting part 12 at the top, one end of the connecting part 12 is connected with the fixing part 13, and the other end is connected with the circular ring component 11.
In an optional embodiment of the present invention, the annular part 11 of the radio frequency coaxial connector detection apparatus 1 adopts a sheet-shaped annular structure, and is sleeved on the sleeve 21 of the radio frequency coaxial connector 2, and an inner diameter of the annular part 11 is greater than an outer diameter of the sleeve 21, so that the annular part 11 and the radio frequency coaxial connector 2 are in a physically isolated state.
In an alternative embodiment of the present invention, the support member of the rf coaxial connector detection device 1 comprises a bottom fixing portion 13 and a top connecting portion 12; the fixing portion 13 of the supporting member is used for fixing with the rfid reader, and specifically adopts a cylindrical structure, the surface of which is provided with threads, and meanwhile, a through hole is formed in the rfid reader housing on the side of the rf coaxial connector 2, and the fixing portion 13 passes through the hole in the device case and is fixed at the end of the fixing portion by a nut 18. A first insulating rubber gasket 14 and a second insulating rubber gasket 16 are respectively arranged between the fixing part 13 of the supporting component and the upper and lower contact surfaces of the radio frequency identification reader-writer shell, and a third insulating rubber gasket 15 is arranged on the inner wall of the opening of the radio frequency identification reader-writer shell, so that the fixing part 13 can be fixed on the radio frequency identification reader-writer shell more firmly, and the fixing part 13 of the supporting component and the radio frequency identification reader-writer shell are in a physical isolation state. Fig. 2 is a schematic view showing the assembly of the support member according to the embodiment of the present invention.
At the end of the fixing part of the support component of the invention, a wire welding column 17 is arranged between the second insulating rubber gasket 16 and the nut 18; the radio frequency coaxial connector detection device 1 is connected with the detection circuit 3 through a wire welding column 17, and the detection circuit 3 is connected in series in a power supply loop of a radio frequency identification reader-writer system.
The connecting part 12 of the support part is used for connecting the ring part 11 and the fixing part 13 of the support part, and particularly adopts a Z-shaped sheet structure, one end of the Z-shaped sheet structure is fixedly connected with the ring part 11, and the other end of the Z-shaped sheet structure is fixedly connected with the top end of the fixing part 13, so that the whole radio frequency coaxial connector detection device 1 is of a sheet pressing structure.
According to the invention, the radio frequency coaxial connector detection device 1 is physically isolated from the radio frequency coaxial connector 2 and the radio frequency identification reader-writer shell, so that the radio frequency coaxial connector detection device 1 is electrically isolated from the radio frequency coaxial connector 2 and the radio frequency identification reader-writer shell when no radio frequency cable is connected through the radio frequency coaxial connector 2.
After the antenna port of the radio frequency identification reader-writer 2 is connected with a radio frequency cable, the radio frequency coaxial connector 2 compresses the connecting part 12 of the radio frequency coaxial connector detection device 1 along with the spiral screwing of the sleeve 21 of the radio frequency coaxial connector 2, so that the ring part 11 of the radio frequency coaxial connector detection device 1 is electrically connected with the equipment shell through the radio frequency coaxial connector 2, namely, a low level equal to the potential of the radio frequency identification reader-writer shell is presented on the lead welding column 17 connected with the radio frequency coaxial connector detection device 1.
In an optional embodiment of the present invention, the detection circuit 3 specifically includes a P-channel enhancement type MOS transistor Q1, an NPN type transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a diode; an emitting electrode of the NPN type triode Q2 is connected with a PAD pin, a base electrode of the NPN type triode Q2 is connected with the PAD pin through a third resistor R3 and is connected with an external power supply input end Adapter _ IN through a second resistor R2, and a collector electrode of the NPN type triode Q2 is connected with the external power supply input end Adapter _ IN through a first resistor R1 and is connected with a grid electrode of a P-channel MOS tube Q1; the source electrode of the P-channel MOS tube Q1 is connected with an external power supply input end Adapter _ IN, and the drain electrode of the P-channel MOS tube Q1 is connected with an equipment power supply input end SYS _ PWR _ IN and is connected with the source electrode thereof through a diode; the PAD pin is connected with a lead welding column 17 of the radio frequency coaxial connector detection device 1 through a lead. Fig. 3 is a schematic structural diagram of a detection circuit according to an embodiment of the present invention.
According to the invention, the first resistor R1 is a grid pull-up resistor of the P-channel MOS tube Q1, so that the grid is in a high-level state before power-on initialization and detection of a unfinished port are ensured, the second resistor R2 and the third resistor R3 are base voltage division bias resistors of an NPN-type triode Q2, if a radio frequency cable is not connected, a PAD pin connected with a lead welding column is suspended, the NPN-type triode Q2 cannot be conducted, namely, a low-level conducting level cannot be provided for the P-channel MOS tube Q1, the P-channel MOS tube Q1 is in a turn-off state, power is not supplied to a radio frequency identification reader-writer, the radio frequency identification reader-writer is in a power-off and power-on state, and the safety of a power amplifier system inside the device is effectively ensured.
After the antenna port of the radio frequency identification reader-writer is connected with a radio frequency cable, the radio frequency coaxial connector 2 compresses the connecting part 12 of the radio frequency coaxial connector detection device 1 along with the spiral screwing of the sleeve 21 of the radio frequency coaxial cable connector 2, so that the ring part 11 of the radio frequency coaxial connector detection device 1 is electrically connected with the equipment enclosure through the radio frequency coaxial connector 2, at this time, the radio frequency coaxial connector 2 is connected with the radio frequency coaxial connector detection device 1 and is at the same potential as the radio frequency identification reader-writer enclosure, namely, the PAD pin of the detection module 3 is at the low level which is at the same potential as the radio frequency identification reader-writer enclosure, so that the NPN type triode Q2 is conducted, and the P-channel MOS tube Q1 is opened, and then the power input Adapter _ IN of the external Adapter can normally input power to the radio frequency identification reader-writer through the SYS _ PWR _ IN.
The invention can be used only by replacing the P-channel MOS tube Q1 according to the power consumption and current of different equipment, and has strong adaptability and wide application scene; meanwhile, the P-channel MOS tube has the advantages of very low on-resistance and low power consumption, and is switched rapidly without occupying the starting time of equipment; compared with a reflection type detection system, the port detection can be completed before the radio frequency microwave power is started, so that the safety is ensured; the invention is suitable for single antenna ports or multiple antenna ports, can realize the protection of the power amplifier of a reader-writer, the low-noise amplifier of a receiving channel of the reader-writer, the unused antenna ports and the matched shielding protective cover, automatically finishes the detection before powering on, and does not need manual intervention.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (2)
1. A radio frequency identification reader system protection and antenna port detection system is characterized by comprising a radio frequency coaxial connector detection device (1) and a detection circuit (3) connected with the radio frequency coaxial connector detection device (1); the radio frequency coaxial connector detection device (1) comprises a circular ring part (11) and a supporting part connected with the circular ring part (11); the annular component (11) is sleeved on a sleeve (21) of the radio frequency coaxial connector (2), and the inner diameter of the annular component (11) is larger than the outer diameter of the sleeve (21); the supporting component comprises a fixing part (13) at the bottom and a connecting part (12) at the top, one end of the connecting part (12) is connected with the fixing part (13), and the other end of the connecting part is connected with the circular ring component (11);
a fixing part (13) of the supporting part is provided with threads, and the fixing part (13) penetrates through an opening on the equipment shell and is matched with a nut (18) for fixing;
a first insulating rubber gasket (14) and a second insulating rubber gasket (16) are respectively arranged between the fixing part (13) of the supporting part and two contact surfaces of the equipment shell; a third insulating rubber gasket (15) is arranged on the fixing part (13) of the supporting component and the inner wall of the opening of the equipment shell;
a wire welding column (17) is arranged between the second insulating rubber gasket (16) and the nut (18);
the radio frequency coaxial connector detection device (1) is connected with the detection circuit (3) through a wire welding column (17), and the detection circuit (3) is connected in series in a power supply loop of the radio frequency identification reader-writer system.
2. The rfid reader system protection and antenna port detection system of claim 1, wherein the detection circuit (3) specifically comprises a P-channel MOS transistor, an NPN-type triode, a first resistor, a second resistor, a third resistor, and a diode; an emitting electrode of the NPN type triode is connected with a PAD pin, a base electrode of the NPN type triode is connected with the PAD pin through a third resistor and is connected with the input end of an external power supply through a second resistor, and a collector electrode of the NPN type triode is connected with the input end of the external power supply through a first resistor and is connected with a grid electrode of a P-channel MOS tube; the source electrode of the P-channel MOS tube is connected with the input end of an external power supply, and the drain electrode of the P-channel MOS tube is connected with the power supply input end of equipment and is connected with the source electrode of the P-channel MOS tube through a diode; and the PAD pin is connected with the wire welding column.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810852336.9A CN109101853B (en) | 2018-07-30 | 2018-07-30 | Radio frequency identification reader-writer system protection and antenna port detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810852336.9A CN109101853B (en) | 2018-07-30 | 2018-07-30 | Radio frequency identification reader-writer system protection and antenna port detection system |
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| CN109101853A CN109101853A (en) | 2018-12-28 |
| CN109101853B true CN109101853B (en) | 2021-07-27 |
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| CN116582118B (en) * | 2023-07-12 | 2023-10-13 | 杭州晟珈智能科技有限公司 | RFID antenna virtual switch circuit and multi-antenna multiplexing device |
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| CN101763498A (en) * | 2009-11-27 | 2010-06-30 | 成都九洲电子信息系统有限责任公司 | Area control circuit for passive ultra high frequency radio frequency identification |
| KR20120122223A (en) * | 2011-04-28 | 2012-11-07 | 주식회사 메닉스 | The Log Periodic Antenna |
| CN102955074A (en) * | 2012-10-25 | 2013-03-06 | 西安开容电子技术有限责任公司 | Design method for annular near-field test probe |
| CN107729783A (en) * | 2017-10-26 | 2018-02-23 | 成都九洲电子信息系统股份有限公司 | A kind of ultrahigh frequency radio frequency identification (RFID) reader antenna port detecting system |
| CN107919919A (en) * | 2017-11-27 | 2018-04-17 | Tcl移动通信科技（宁波）有限公司 | A kind of binary channel transmission power change detection circuit, device and mobile terminal |
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2018
- 2018-07-30 CN CN201810852336.9A patent/CN109101853B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763498A (en) * | 2009-11-27 | 2010-06-30 | 成都九洲电子信息系统有限责任公司 | Area control circuit for passive ultra high frequency radio frequency identification |
| KR20120122223A (en) * | 2011-04-28 | 2012-11-07 | 주식회사 메닉스 | The Log Periodic Antenna |
| CN102955074A (en) * | 2012-10-25 | 2013-03-06 | 西安开容电子技术有限责任公司 | Design method for annular near-field test probe |
| CN107729783A (en) * | 2017-10-26 | 2018-02-23 | 成都九洲电子信息系统股份有限公司 | A kind of ultrahigh frequency radio frequency identification (RFID) reader antenna port detecting system |
| CN107919919A (en) * | 2017-11-27 | 2018-04-17 | Tcl移动通信科技（宁波）有限公司 | A kind of binary channel transmission power change detection circuit, device and mobile terminal |
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