CN209168126U - A kind of high-power reader based on ISO11784785 agreement - Google Patents

Abstract

The utility model discloses a kind of high-power readers based on ISO11784785 agreement, it is related to field of radio frequency identification, reader includes power supply, power amplification circuit is isolated, carrier wave filter circuit, demodulator circuit, antenna automatic tuning circuit, MCU governor circuit, communication and indicating circuit: wherein power supply respectively with power amplification circuit is isolated, MCU governor circuit, communication is connected with indicating circuit and demodulator circuit and provides power supply, MCU governor circuit with power amplification circuit be isolated be connected with antenna automatic tuning circuit, isolation power amplification circuit is connected with carrier wave filter circuit, carrier wave filter circuit is connected with antenna automatic tuning circuit, antenna automatic tuning circuit is connected with demodulator circuit, demodulator circuit is connected with MCU governor circuit, furthermore MCU governor circuit Also communication is connected with indicating circuit, this kind of reader working frequency is 134.2KHz, and farthest transmission range is 150 centimetres.

Description

A kind of high-power reader based on ISO11784785 agreement

Technical field

The utility model relates to field of radio frequency identification, and in particular to a kind of to be read based on the high-power of ISO11784785 agreement Read device.

Background technique:

Radio frequency identification (Radio Frequency Identification, RFID) technology is that a kind of radio frequency is believed Number non-contact automatic identification technology communicated.There is efficient, reliable, non line of sight to read and can work in evil slightly environment for it The advantages that, therefore it is widely used in data acquisition and commodity identification field.Developed in recent years very rapidly, was widely used in The various fields such as industry, business and communications and transportation control control.It is shown according to related AUTHORITATIVE DATA, RFID technique has wide Market prospects.

But during RFID technique application, it is close there are still operating distance the problems such as, limit the depth of RFID technology Enter application.Especially for the RFID system of low-frequency range (0-135KHz), usual operating distance is not more than 10cm, greatly limits The application of RFID.

Utility model content

The purpose of this utility model is to provide a kind of high-power readers based on ISO11784785 agreement, to solve The above-mentioned defects caused by the prior art.

A kind of high-power reader based on ISO11784785 agreement, including power supply, MCU governor circuit, isolation function Rate amplifying circuit, carrier wave filter circuit, antenna automatic tuning circuit, demodulator circuit and communication and indicating circuit, the power supply electricity Source respectively with MCU governor circuit, power amplification circuit, demodulator circuit and communication is isolated with indicating circuit is electrically connected and powers, The MCU governor circuit, isolation power amplification circuit, carrier wave filter circuit, antenna automatic tuning circuit and demodulator circuit are successively It is electrically connected, the MCU governor circuit electrically connects with demodulator circuit, antenna automatic tuning circuit and communicating with indicating circuit respectively It connects, the isolation power amplification circuit includes several triodes, two pole of several current-limiting resistances, several capacitances and several afterflows Pipe, the triode includes Q2, Q3, Q4 and Q5, and the current-limiting resistance includes R15, R16, R18 and R19, the capacitance packet Include C33, C34, C35, C36 and C37, the freewheeling diode includes D13 and D15, and clamp diode includes D12, D14, described The emitter of triode Q5 is grounded, and the collector of triode Q2 connects 5V power supply, the current-limiting resistance R15 and R18 respectively with three poles The emitter of pipe Q2 is connected and is shorted with the emitter of Q3, is shorted point and is connected respectively with capacitance C33 and C36, capacitance The other end of C33 and C36 is connected with capacitance C35 again after connecting respectively with current-limiting resistance R16 and R19, the capacitance The both ends of C35 are separately connected the base stage of pliotron Q3 and Q4, and the base stage of the Q3 is also connected with clamp diode D12, institute The base stage for stating Q4 is also connected with clamp diode D14, the plus earth of the sustained diode 15, the yin of sustained diode 13 Pole connects+12V power supply, and the anode of D13 is connected with the cathode of D15, and the point that is connected is in parallel with the capacitor that C37 is formed with capacitance C34 Circuit connection, the other end of the capacitor parallel circuit export radio-frequency carrier signal, what the MCU governor circuit generated 134.2KHz square wave input controls triode Q2, Q3 in the low and high level wheel conductance of square wave to the base stage of triode Q2, Q3 respectively It is logical, by pliotron Q3, Q4 of its alternating component of capacitance C33, C36 capacitive coupling to rear class after current-limiting resistance Base stage generates the 134.2KHz square wave that peak-to-peak value is 12V to control the conducting in turn of pliotron Q3, Q4.

Preferably, after the antenna automatic tuning circuit mesohigh capacitor C39 is in parallel with high-voltage capacitance C40 with coil antenna Series resonant network is formed, one end of series resonant network is connected separately with the tuned cell of 4 tunnel same compositions.

Preferably, the tuned cell is divided into tuned cell one, tuned cell two, tuned cell three and tuned cell four, The tuned cell one includes high-voltage capacitance C52 and C56, field-effect tube Q6, current-limiting resistance R35 and triode Q10, and bypass Capacitor C60, the high-voltage capacitance C52 are grounded after connecting respectively with the drain electrode of field-effect tube Q6 and high-voltage capacitance C56, the field effect Should the gate pole of pipe Q6 be connected with the collector of current-limiting resistance R35 and triode Q10, the triode Q10 emitter ground connection, base Pole is controlled by the logic level of MCU governor circuit, acts on the gate pole of field-effect tube Q6.

Preferably, the demodulator circuit includes coil antenna, current-limiting resistance R21, rectifier diode D17, rectifier diode D16, high-voltage capacitance C47, capacitance C43, clamp diode D18, resistance R31, resistance R28 and capacitor C48, the current limliting Resistance R21 connection rectifier diode D17, rectifier diode D16 connection high-voltage capacitance C47, by capacitance C43 connection clamper two Pole pipe D18 reconnection resistance R31 finally connect capacitor C48 with resistance R28 and finally connects operational amplifier U5, U6.

Preferably, the low pass that the carrier wave filter circuit is made of shielding inductance L2, high-voltage capacitance C38 and shielding inductance L3 Filter is constituted.

Utility model has the advantages that this kind is suitable for animal identification based on ISO11784/ISO11785 agreement High-power reader makes its work in 134.2KHz by improved isolation power amplification circuit and antenna automatic tuning circuit, Farthest transmission range can reach 150cm, be applicable in and remote, can be to the 134.2KHz passive electronic label in the distance range Carry out information reading.The operating distance of this reader is remote, and anti-interference ability is good, and structure is simple and stable and reliable in work.Especially table Present following two o'clock:

1, the utility model passes through the choosing of the circuit design and device of isolation power amplification circuit and antenna automatic tuning circuit It takes, the crest voltage of up to 60V can be generated on coil antenna P7, realize to obtain enough electromagnetic fields to electronic tag Remote data is read.

2, the isolation power amplification circuit of the utility model uses D class half-bridge power amplifying circuit, so that high efficiency is obtained, Play the role of to energy conservation and environmental protection positive.

Detailed description of the invention

Fig. 1 is the system block diagram of the utility model.

Fig. 2 is the circuit diagram that power amplification circuit and carrier wave filter circuit are isolated in the utility model.

Fig. 3 is the circuit diagram of antenna automatic tuning circuit in the utility model.

Fig. 4 is the circuit diagram of demodulator circuit in the utility model.

Fig. 5 is the circuit diagram of MCU governor circuit and communication and indicating circuit in the utility model.

Fig. 6 is the circuit diagram of power supply in the utility model.

Specific embodiment

To be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, below In conjunction with specific embodiment, the utility model is further described.

As shown in Figure 1, a kind of high-power reader based on ISO11784785 agreement, including power supply, MCU master control Circuit, isolation power amplification circuit, carrier wave filter circuit, antenna automatic tuning circuit, demodulator circuit and communication and indicating circuit, The power supply respectively with MCU governor circuit, power amplification circuit, demodulator circuit and communication be isolated electrically connect with indicating circuit It connects and powers, the MCU governor circuit, isolation power amplification circuit, carrier wave filter circuit, antenna automatic tuning circuit and demodulation Circuit is successively electrically connected, the MCU governor circuit respectively with demodulator circuit, antenna automatic tuning circuit and communicate with instruction Circuit is electrically connected.

As shown in Fig. 2, the isolation power amplification circuit includes 1 current-limiting resistance, 2 triodes Q2 and Q5,4 limits Leakage resistance R15, R18 and R16, R19,2 capacitances C33 and C36,2 clamp diodes D12 and D14, a voltage are kept Capacitor C35,2 pliotron Q3 and Q4 compositions.The low frequency 134.2KHz square wave carrier signal that specially MCU is generated passes through limit It is input to after leakage resistance R17 current limliting in the half bridgepush pull circuit being made of Q2 and Q3, by the half bridgepush pull circuit output side of recommending by force Wave carrier signal signal is electric by being coupled to the power amplification of next stage after C33, C36 blocking after current-limiting resistance R15, R16 current limliting Low frequency 134.2KHz carrier wave square-wave signal peak-to-peak value is at this time improved under the action of R16, R19 and voltage holding capacitor C35 in road Onto the level close to 12V.Diode D13, D15 do afterflow effect, and D12, D14 do voltage clipping to protect the function of Q3, Q4.

As shown in Fig. 2, the carrier wave filtered electrical routing capacitance C34 is in parallel with C37, inductance L2, L3 and capacitor C38 are formed. Specially C34 is in parallel with C37 to be used as capacitance, and L2, C38, L3 form T-type matching network and make as low-pass filter With so that becoming sine wave carrier after filtering out its higher hamonic wave from the 134.2KHz carrier wave square wave that isolation power amplification circuit exports With the conjugate impedance match for realizing coil antenna and power amplifier, the energy transmission of peak efficiency is realized.

As shown in figure 3, the antenna automatic tuning circuit by coil antenna and C39, C40 form series resonant network, R27, R30, C46, R26, C45 composition band divide 2 grade of 1 rank RC filter circuit and with four parts and R39, C60, Q10, R35 The MOS of composition pushes circuit and C52, C56 and Q6 composition.Specially MCU governor circuit is limited using logic level signal by R39 The on or off of triode Q10 is controlled after stream and C60 filtering, it is real using the external R35 to+12V power supply of the collector of triode The control level of existing high level about 12V low level about 0V is added to the gate pole of Q6, so that Q6 is in fully on or off state, control The ground connection of the tie point of C52 and C56 processed is hanging, realizes that controllable capacity is parallel on coil antenna to realize automatic adjust Humorous function.Coil voltage is filtered laggard by 2 grade of 1 rank RC filter circuit with partial pressure of R27, R30, C46, R26, C45 composition Enter MCU and carry out AD sampling acquisition, to get the voltage max of coil antenna.

As shown in figure 4, the demodulator circuit by R21, D17, D16 current limliting and rectification after send by C47, C43, D18, R31, Feeding is made of operational amplifier U5 and U4 after the envelope detection and clamper and bandwidth-limited circuit detection of R28, C48 composition 2 grades of see-saw circuits are sent to MCU after amplifying and carry out demodulation realization, specially containing the differential two-phase of label coding information Coded carrier signal by be sent into after R21, D17 and D16 current limliting and rectification the low-pass filter being made of C47, C43 and R31 into Row envelope detection, envelope signal peak value is excessive in order to prevent after envelope detection, using D18 carry out clamper after envelope signal by The bandpass filter that C43, R31, R28, C48 are constituted is sent into the two-stage exchange input being made of U5, U4 after carrying out bandpass filtering See-saw circuit is sent after carrying out waveform amplification and shaping to MUC progress data demodulation.

As shown in figure 5, the MCU governor circuit and communication and indicating circuit include by single-chip microcontroller U1 and its minimum system electricity The conversion circuit of road and 232 level of TTL serial port power flat turn being made of U2 and 485 level of TTL serial port power flat turn being made of U3 Conversion circuit and be made of the LED indicating circuit that buzzer LS1 and D6, D7, D8, D9 are formed.Implement 232 He of serial ports 485 level are communicated with other equipment and buzzer and LED indication function.

As shown in fig. 6, the power supply is consisted of three parts using public version design, is+12V power supply circuit respectively ,+ 5VA analog device power supply circuit ,+5VD digital device power supply circuit, wherein+12V power supply circuit is by FB1, C15, L1, C16, C17 Constitute, to from power supply adaptor power supply carry out 4 rank low pass LC filtering ,+5VD power supply circuit by FB2, C18, C20, VR1, C19, C21 are constituted, and+5VA power supply circuit is made of FB3, C23, C32, C25, VR2, C24, C26.

As known by the technical knowledge, the utility model can pass through other essence without departing from its spirit or the reality of essential feature Scheme is applied to realize.Therefore, embodiment disclosed above, in all respects are merely illustrative, and are not only 's.All changes that come within the scope of the invention or equivalents of the invention are by the utility model packet Contain.

Claims (5)

1. a kind of high-power reader based on ISO11784785 agreement, including power supply, MCU governor circuit, isolation power Amplifying circuit, carrier wave filter circuit, antenna automatic tuning circuit, demodulator circuit and communication and indicating circuit, the power supply Respectively with MCU governor circuit, power amplification circuit, demodulator circuit and communication is isolated with indicating circuit is electrically connected and powers, institute It is successively electric to state MCU governor circuit, isolation power amplification circuit, carrier wave filter circuit, antenna automatic tuning circuit and demodulator circuit Property connection, the MCU governor circuit electrically connects with demodulator circuit, antenna automatic tuning circuit and communicating with indicating circuit respectively Connect, which is characterized in that the isolation power amplification circuit include several triodes, several current-limiting resistances, several capacitances and Several freewheeling diodes, the triode include Q2, Q3, Q4 and Q5, and the current-limiting resistance includes R15, R16, R18 and R19, institute Stating capacitance includes C33, C34, C35, C36 and C37, and the freewheeling diode includes D13, D15, and clamp diode includes D12, D14, the emitter ground connection of the triode Q5, the collector of triode Q2 connect 5V power supply, the current-limiting resistance R15 and R18 is connected and is shorted with the emitter of the emitter of triode Q2 and Q3 respectively, be shorted point respectively with capacitance C33 and C36 It is connected, the other end of capacitance C33 and C36 are connected with capacitance C35 again after connecting respectively with current-limiting resistance R16 and R19, The both ends of the capacitance C35 are separately connected the base stage of pliotron Q3 and Q4, and the base stage of the Q3 is also connected with clamper Diode D12, the base stage of the Q4 are also connected with clamp diode D14, the plus earth of the sustained diode 15, afterflow The cathode of diode D13 connects+12V power supply, and the anode of D13 is connected with the cathode of D15, and be connected point and capacitance C34 and C37 group At the connection of capacitor parallel circuit, the other end of the capacitor parallel circuit exports radio-frequency carrier signal, the MCU governor circuit The 134.2KHz square wave input of generation controls triode Q2, Q3 in the low and high level of square wave to the base stage of triode Q2, Q3 respectively It is connected in turn, three pole of power after current-limiting resistance by its alternating component of capacitance C33, C36 capacitive coupling to rear class Pipe Q3, Q4 base stage generate the 134.2KHz square wave that peak-to-peak value is 12V to control the conducting in turn of pliotron Q3, Q4.

2. a kind of high-power reader based on ISO11784785 agreement according to claim 1, it is characterised in that: institute State antenna automatic tuning circuit mesohigh capacitor C39 it is in parallel with high-voltage capacitance C40 after with coil antenna form series resonant network, One end of series resonant network is connected separately with the tuned cell of 4 tunnel same compositions.

3. a kind of high-power reader based on ISO11784785 agreement according to claim 2, it is characterised in that: institute It states tuned cell and is divided into tuned cell one, tuned cell two, tuned cell three and tuned cell four, the tuned cell one includes High-voltage capacitance C52 and C56, field-effect tube Q6, current-limiting resistance R35 and triode Q10 and shunt capacitance C60, the high-voltage capacitance C52 is grounded after connecting respectively with the drain electrode of field-effect tube Q6 and high-voltage capacitance C56, gate pole and the current limliting electricity of the field-effect tube Q6 Resistance R35 is connected with the collector of triode Q10, the triode Q10 emitter ground connection, logic of the base stage by MCU governor circuit Level control, acts on the gate pole of field-effect tube Q6.

4. a kind of high-power reader based on ISO11784785 agreement according to claim 1, it is characterised in that: institute State demodulator circuit include coil antenna, current-limiting resistance R21, rectifier diode D17, rectifier diode D16, high-voltage capacitance C47, every Straight capacitor C43, clamp diode D18, resistance R31, resistance R28 and capacitor C48, the current-limiting resistance R21 connection rectify two poles Pipe D17, rectifier diode D16 connection high-voltage capacitance C47 reconnect resistance by capacitance C43 connection clamp diode D18 R31 finally connect capacitor C48 with resistance R28 and finally connects operational amplifier U5, U6.

5. a kind of high-power reader based on ISO11784785 agreement according to claim 1, it is characterised in that: institute Carrier wave filter circuit is stated to be made of the low-pass filter that shielding inductance L2, high-voltage capacitance C38 and shielding inductance L3 are formed.