The utility model content
The purpose of this utility model provides a kind of ultrahigh frequency semi-active RFID tag, and super high frequency radio frequency knowledge label is a problem passive and that can not store mass data and can not read at a distance in the prior art to solve.
In order to address the above problem, the utility model provides a kind of ultrahigh frequency semi-active RFID tag, this label comprises: power supply, microprocessor, ultra-high frequency antenna, booster circuit and backscattering circuit, and wherein: described power supply is connected with described microprocessor, to described microprocessor power supply; Described booster circuit is connected with described ultra-high frequency antenna, and the output boost signal is to described microprocessor; Described backscattering circuit is connected with described microprocessor, conducting or disconnection under described microprocessor control.
Described ultrahigh frequency semi-active RFID tag also comprises detecting circuit, and described detecting circuit is connected with described ultra-high frequency antenna, and the radiofrequency signal that output detects is to described microprocessor.
Described detecting circuit is the diode detection circuit.
Described ultrahigh frequency semi-active RFID tag also comprises LCDs and diode display circuit, and MOS (Metal Oxide Semiconductor Field Effect Transistor, be abbreviated as MOSFET, be called for short MOS, be the MOS type field effect transistor) power switch, described microprocessor is controlled described MOS power switch conducts, so that described power supply is powered to described diode display circuit; Described microprocessor is controlled described LCDs light on and off.
Described ultrahigh frequency semi-active RFID tag comprises also and wakes button up that the output key signal is to described microprocessor.
Described microprocessor is a single-chip microcomputer.
Described detecting circuit is connected with comparer in the described single-chip microcomputer.
Described ultrahigh frequency semi-active RFID tag comprises that also feedback circuit is connected between described detecting circuit and the comparer.
Described backscattering circuit comprises a MOS switch.
Therefore, the utility model ultrahigh frequency semi-active RFID tag adopts powered battery, has data high capacity memory block, low-power consumption, and big memory block, volume is little, has the liquid crystal display function.The utility model ultrahigh frequency semi-active RFID tag can be used for various warehouse logistics scenes.
As shown in Figure 1, be the structural representation of the embodiment 1 of the utility model ultrahigh frequency semi-active RFID tag.In Fig. 1, this ultrahigh frequency semi-active RFID tag 1 comprises: power supply 10, microprocessor 11, ultra-high frequency antenna 12, booster circuit 13 and backscattering circuit 14, wherein: described power supply 10 is connected with described microprocessor 11, to described microprocessor 11 power supplies; Wherein power supply 10 is generally lithium battery, when also unrestricted; Described booster circuit 13 boosts first radiofrequency signal that described ultra-high frequency antenna 12 receives, and exports boost signal to microprocessor 11, to wake described microprocessor 11 up; Described backscattering circuit 14 is connected with described microprocessor 11, and described backscattering circuit 14 is in conducting or disconnection under described microprocessor 11 controls, impels described ultra-high frequency antenna 12 received RF signals or reflected radio signal.When ultra-high frequency antenna is operated near the metal object, can very big influence all be arranged to impedance, gain, the directional diagram of antenna, utilize metal as the part of antenna reflection electromagnetic wave together, effectively utilized metal covering, make metal covering also participate in radiation, increased the swept area of antenna, it is bigger when not having the metal background to make antenna gain, and promptly ultra-high frequency antenna has metal covering.Microprocessor preferably adopts low-power scm, be used to finish protocol conversion, decoding, coding, functions such as peripheral hardware control, and provide service provider (ISP) download function, such as decoding, enter single-chip microcomputer after the radiofrequency signal digitizing, the software of single-chip microcomputer inside determines it is what instruction, makes a series of actions then.For coding, the software of single-chip microcomputer inside decides and will reflect what order and comprise frame format.Peripheral hardware control control power supply exactly, LED light, LCD shows etc.ISP downloads and is meant that the user can be with the online single-chip microcomputer inside that downloads to of needed program.
Promptly, the course of work of above-mentioned ultrahigh frequency semi-active RFID tag 1 is that described power supply 10 is to described microprocessor 11 power supplies, as long as after receiving the first faint radiofrequency signal that reader sends, booster circuit 13 just can boost by the signal that this is faint, export boost signal to microprocessor, thereby wake this microprocessor up, the backscattering of microprocessor control from then on circuit, microprocessor is the passive work that excites owing to exist power supply to power still in the utility model, so be called partly active.The backscattering circuit is made up of a MOS (MOS type field effect transistor) switch.This microprocessor turn-offs the conducting of backscattering circuit and controls, thereby changes the impedance of seeing into from antenna opening.When backscattering circuit (being the MOS switch) disconnects, the impedance of ultra-high frequency antenna and Circuit Matching, then ultra-high frequency antenna received RF signal.In the time of backscattering circuit (being the MOS switch) conducting, the serious mismatch of the impedance of ultra-high frequency antenna and circuit, reflected radio signal, label do not receive this radiofrequency signal.Thereby, carry out the reception and the reflection of UHF radiofrequency signal by the break-make of switch.This embodiment 1 has realized waking microprocessor up by radiofrequency signal, and the reception and the emission of the radiofrequency signal that reader is sent.Booster circuit can adopt the Dickson booster circuit in the utility model, can boost to faint radiofrequency signal, thereby can wake microprocessor up when-13dBm UHF signal.Signal after the radiofrequency signal process is boosted also has other purposes, and as surface depicted in Figure 2, the signal after boosting carries out digital processing through diode detection.
As shown in Figure 2, be the structural representation of the embodiment 2 of the utility model ultrahigh frequency semi-active RFID tag.In Fig. 2, in Fig. 1 embodiment the included components and parts, also comprise detecting circuit 15, described detecting circuit 15 is connected with described ultra-high frequency antenna 12, detect with the radiofrequency signal that described ultra-high frequency antenna 12 is received, and after carrying out digital processing, export described microprocessor 11 to, the radiofrequency signal that i.e. output detects is to described microprocessor 11, radiofrequency signal after boosting through booster circuit 13 simultaneously, after also detecting and carry out digital processing, export microprocessor 11 to through this detecting circuit.Described in this example microprocessor is a single-chip microcomputer, and radiofrequency signal exports in the comparer 111 of described single-chip microcomputer after tested carries out digitizing, encoded by single-chip microcomputer then, to the storage unit of single-chip microcomputer obtain the data of storage according to the radiofrequency signal of this coding this moment.Described detecting circuit is preferably the diode detection circuit, thereby circuit structure is simply adjustable, save cost.Also be connected with positive-feedback circuit 20 as shown in Figure 2 between described detecting circuit and comparer, positive-feedback circuit is used to prevent the weak radio-frequency signal false triggering, improves accuracy.
In this example, this ultrahigh frequency semi-active RFID tag is receiving the radiofrequency signal that the ultrahigh frequency electric wire receives, this signal is encoded, single-chip microcomputer is selected required data according to the signal after encoding in storage unit, return etc. such as sequence code, perhaps reader sends radiofrequency signal the data in the storage unit is read and write, such as the quantity of article in the updated stored unit.This embodiment 2 has realized the radiofrequency signal of the reader that receives is handled, and then the memory block of single-chip microcomputer is operated.
As shown in Figure 3, be the structural representation of the embodiment 3 of the utility model ultrahigh frequency semi-active RFID tag.On the basis of embodiment 2, also comprise with lower member, described ultrahigh frequency semi-active RFID tag 1 also comprises LCDs 16 and diode display circuit 17, and MOS power switch 18, described MOS power switch 18 is connected with microprocessor 11 with power supply 10, described MOS power switch 18 conductings of described microprocessor 11 controls are so that described power supply 10 is to described diode display circuit 17 power supplies; Described LCDs 16 lights on and off of microprocessor 11 controls simultaneously.As shown in the figure, this ultrahigh frequency semi-active RFID tag 1 also comprises and wakes button 19 up, press the described button 19 that wakes up, the output key signal is to microprocessor 11, wake this microprocessor 11 up, described subsequently microprocessor 11 can be controlled MOS power switch 18 by the peripheral hardware steering order and give described diode display circuit 17 power supplies and light described LCDs 16, and promptly diode display circuit powers under microprocessor control, and LCDs is lighted.Wherein LCDs 16 is 128*64 lattice lcds, is used for the user data of display label, can display digit, English etc. can show Chinese character again.Waking 19 of buttons up is that (No Mask Interrupt NMI) interrupts waking mode up, wakes Single-chip Controlling LCD demonstration and LED up and lights in the not maskable interruption of adopting low-power scm.As shown in the figure, described MOS power switch 18 is used for the power supply of LCD display and LED display circuit by the IO foot control system of MCU.This ultrahigh frequency semi-active RFID tag 1 is opened the metal-oxide-semiconductor switch of LCD screen and led circuit power supply after ultra-high frequency signal wakes up, Presentation Function is provided.
In the present embodiment, realized that utilization wakes button up and wakes single-chip microcomputer up, and the label internal information has been shown.
Described among the above-mentioned embodiment shown in Figure 33 wake button 10 up and wake single-chip microcomputer up after, open the metal-oxide-semiconductor switch that LCD screen and led circuit are powered, Presentation Function is provided.Certainly, the above-mentioned metal-oxide-semiconductor switch of opening LCD screen and led circuit power supply, provide Presentation Function also can embodiment 1 describe after radiofrequency signal is boosted, carry out after the radiofrequency signal that utilization is boosted is waken single-chip microcomputer up.Be that the structural drawing of the other embodiment of the utility model ultrahigh frequency semi-active RFID tag 1 can also not comprise and wakes button 19 up shown in Fig. 3, and this embodiment also can realize the Presentation Function of label.
The structure of this half active RFID tag of the utility model comprises single-chip microcomputer, ultra-high frequency antenna, detecting circuit, booster circuit, backscattering circuit, metal-oxide-semiconductor on-off circuit etc., also comprises by luminescence unit (being the LED display circuit), the giant-screen LCD display unit (being LCDs) of Micro Controller Unit (MCU) driving and wakes button etc. up.Can provide dual mode to come single-chip microcomputer is waken up after adopting the utility model, described in a kind of as Fig. 1 and the embodiment 1 is that radiofrequency signal is passed through to boost and waken up, and another wakes up as Fig. 3 and the embodiment 3 described buttons that wake up exactly.Like this, when not having radiofrequency signal, the user can be simply shows content in the ultrahigh frequency semi-active RFID tag with button.
And under these two kinds of modes that single-chip microcomputer is waken up, after microprocessor wakes up, the peripheral hardware steering order that sets in advance according to its inside, give that circuit supply, LED light, LCD shows, then the ultra-high frequency signal from reader that receives is carried out digital processing and decode, make a series of actions.
The utility model is widely used, and the utility model can be fixed on the shelf such as storehouse, shop.The reader of using uhf band to the utility model check, operation such as read-write, finish functions such as the warehouse-in outbound of making an inventory of goods in a warehouse, be example to check, the utility model is placed into certain article place of storehouse.The utility model label can be used for writing down also has what article, price of every kind of article or the like.When going to check with reader, it is reader emission UHF radiofrequency signal (checking signal), after the utility model label 1 receives this radiofrequency signal, wake single-chip microcomputer after boosting up, single-chip microcomputer is powered led circuit according to the peripheral hardware steering order of its inside, LCD lights, simultaneously with after UHF radiofrequency signal (checking signal) the process detecting circuit digital processing just now, export to single-chip microcomputer, the radiofrequency signal decoding of single-chip microcomputer after to this digital processing, from the storage unit of single-chip microcomputer, the various information of article are accessed, on LCD, show the kind of article then, price, parameters such as volume residual.When reader counting, LCD of the present utility model can show Item Information.When the article of label representative increase and decrease, can read and write accordingly the memory block of label with reader, more the quantity of new article and other information.
The utility model UHF semi-active RFID tag has been realized the high capacity memory function of band Presentation Function, and size is little, applied range, and stable performance, easy batch machining, long service life, easy to install.
Should be noted that at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment, change the utility model or be equal to replacement, and not break away from the spirit and scope of the utility model and claim.